Patent Description:
Process material supply systems that are currently installed in semiconductor manufacturing plants are generally configured to couple the plurality of tanks to a semiconductor manufacturing device through only one supply line. There are disadvantages in that it is difficult to individually control the plurality of tanks so as to adjust the discharged amount of the chemical products supplied to the semiconductor manufacturing device, and process material is supplied only through a specific tank.

In addition, in the case of the above, when the periodic management of a plurality of tanks is not integrated and systematic, there is a disadvantage in that it is difficult for the operator to accurately recognize when the stored process materials are exhausted and to arbitrarily adjust the time when any tank has to be replaced. Accordingly, when several tanks have to be replaced at the same time due to the simultaneous occurrence of these disadvantages, the entire manufacturing line may be stopped even though the continuous supply of the chemical products is important in the semiconductor manufacturing process. <CIT> relates to a gas supply apparatus for supplying gas to a process apparatus using a plurality of gas containers, comprising: a plurality of tanks (<NUM>, <NUM>) for storing a gas used to manufacture a semiconductor; a main-supply line (<NUM>) configured to communicate with sub-supply lines (<NUM>, <NUM>) respectively coupled to the plurality of tanks (<NUM>, <NUM>) and to supply the gas to a semiconductor manufacturing device; and a plurality of valves (AV2A, AVllA, AV2B, AVllB) respectively included in the sub-supply lines (<NUM>, <NUM>) and configured to control the gas flow rate discharged from each of the plurality of tanks (<NUM>, <NUM>) (see paragraphs [<NUM>], [<NUM>] and <FIG>). <CIT> discloses a slurry and/or chemical blend supply apparatus suitable for providing slurry and/or chemical blend to chemical mechanical planarization (CMP) tools or other tools in a semiconductor fabrication facility, related processes, methods of use and methods of manufacture. The slurry and/or chemical blend supply apparatus includes one or more of the following: feed module, blend module, analytical module and distribution module. <CIT> relates to a facility for supplying a high-purity ammonia gas, which is required in a semiconductor or an LED manufacturing process, at a large capacity. In particular, a large-scale semiconductor manufacturing factory or an LED manufacturing factory manufactures a large amount of high purity ammonia to an ammonia gas supply system capable of supplying a large amount of ammonia gas so that gas can be supplied smoothly. It discloses in paragraphs [<NUM>], [<NUM>] and [<NUM>] and <FIG>: a supplement tank (<NUM>) coupled to the main-supply line to discharge the stored ammonia gas. <CIT> discloses a vertical multi gas supply system, comprising a cabinet which comprises a gas container storing gas required for a plurality of semiconductor device manufacturing equipment, the cabinet further comprising a gas distribution supply piping.

Accordingly, when several tanks have to be replaced at the same time due to the simultaneous occurrence of these disadvantages, the entire manufacturing line may be stopped even though the continuous supply of the chemical products is important in the semiconductor manufacturing process.

The present disclosure is directed to providing a supply control system for a process material delivery system in which, with respect to a plurality of tanks installed to supply process material used to manufacture a semiconductor to a semiconductor manufacturing device, a process material flow rate discharged from each of a plurality of tanks can be controlled , a replacement cycle of each of the plurality of tanks can be efficiently managed by checking and controlling a remaining amount of process material, and a fixed amount of process material required for the semiconductor manufacturing device can be stably supplied to the semiconductor manufacturing device even if a specific tank is replaced or an abnormality occurs in a pipe.

This can be achieved by a supply control system for a plurality of tanks as disclosed in the appended claims.

The controller may be configured to control the plurality of flow control devices to operate at different opening rates, such that process material stored in the plurality of tanks is discharged from each of the plurality of tanks at a different flow ratio and the plurality of tanks are exhausted sequentially.

The plurality of tanks and the back-up portion may include at least one of a load cell or a pressure sensor to estimate the remaining amount of stored process material, the load cell being configured to measure the weight of each of the plurality of tanks and the back-up portion that changes according to discharging of stored process material, and the pressure sensor being configured to measure the internal pressure of each of the plurality of tanks and the back-up portion that changes according to discharging of stored process material.

The controller may be configured to control the back-up portion to supplementally supply process material when there is an abnormality in the information on the process material flow rate and the information on the process material supply pressure measured by the sensor.

The controller may be configured to control an operation of the back-up portion to supplementally supply process material while a specific one of the plurality of tanks is being replaced according to sequential process material exhaustion of the plurality of tanks.

When the plurality of tanks comprises a first tank, a second tank, a third tank, and a fourth tank, the controller may be configured to control, based on the process material flow rate set to be supplied to the semiconductor manufacturing device through the main-supply pipe, each of the plurality of flow control devices such that the first, second, third, and fourth tanks discharge <NUM>%, <NUM>%, <NUM>%, and <NUM>% of process material flow rate, respectively.

The controller may be configured to control, based on the process material flow rate set to be supplied to the semiconductor manufacturing device through the main-supply pipe, each of the plurality of flow control devices such that the first, second, third, and fourth tanks discharge <NUM>%, <NUM>%, <NUM>%, and <NUM>% of process material flow rate, respectively, when the replacement of the first tank is completed according to the exhaustion of process material stored in the first tank.

According to the supply control system for a plurality of tanks according to the embodiments of the present disclosure, since the plurality of flow control device included in the sub-supply pipes and configured to control the process material flow rate discharged from each of the plurality of tanks for storing process material used to manufacture the semiconductor, and the back-up portion coupled to the main-supply pipe and configured to supplementally discharge process material to stably supply process material, can be controlled by the controller based on the process material flow rate and the process material supply pressure measured in real time by the sensor of the main-supply pipe, respectively, the remaining amount of process material for each of the plurality of tanks can be checked and controlled, the replacement cycle of each of the plurality of tanks can be efficiently managed, and even if any one of the plurality of tanks is replaced or an abnormality occurs in the pipe, a fixed amount of process material required for the semiconductor manufacturing device can be stably supplied.

Hereinafter, the preferable embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description of related known technology will be omitted when it may obscure the subject matter of the embodiments according to the present disclosure.

For sake of clarity, objects referred to previously or hereafter as a 'tank' may encompass any enclosed vessel constructed of stainless steel, Cr-Mo steel alloys such as Alloy <NUM>, nickel, aluminum, or other suitable materials which can sustain pressures ranging from <NUM> Torr to ><NUM> psig (<NUM> Pa to > <NUM>,<NUM> MPa). The internal volume of the tank may range from less than <NUM> liter to <NUM> liters or more.

Also for sake of clarity, anything referred to previously or hereafter as a 'process material' may be any materials that is used in the manufacture of semiconductors. That may include materials which are either stored in or delivered in the phase of matter of a solid, liquid, gas, liquefied compressed gas, or supercritical fluid.

Finally, and for sake of clarity, components referred to previously or hereafter as a 'flow control device' may encompass any means of varying the volume or pressure of a process material flowing through or out of a process material delivery system used in the manufacture of semiconductors. These components may include mass flow controllers, proportional control valves, pressure control valves (regulators), restrictive flow orifices, and pneumatically actuated valves. The flow rates being controlled may range from <NUM> liters per minute to greater than <NUM> liters per minute. The pressure may range from <NUM> Torr to ><NUM> psig (<NUM> Pa to > <NUM>,<NUM> Mpa).

<FIG> is a block diagram schematically illustrating the overall configuration of a supply control system for a tank according to an embodiment of the present disclosure, <FIG> is a flow chart illustrating a series of processes in which process material stored in a tank is supplied to a semiconductor manufacturing device according to the embodiment of <FIG>, <FIG> is a diagram illustrating an operation state in which process material stored in a plurality of tanks illustrated in <FIG> is discharged from each of the plurality of tanks at a different flow ratio such that the plurality of tanks are exhausted sequentially, <FIG> is a diagram illustrating an operation state of a back-up portion when an abnormality occurs while supplying process material to a semiconductor manufacturing device according to the embodiment of <FIG>, and <FIG> is a view illustrating an operation state in which process material is transmitted at a changed flow ratio after replacing a tank due to process material supply according to the embodiment of <FIG>.

The terms "over", "under", "left and right", "front", and "rear", and the like, which designate directions in the description and claims of the present disclosure, are not intended to limit the scope of protection of the present disclosure, but are defined based on the relative positions between the drawings and components to facilitate the description, the three axes may be interchanged through rotation to correspond to each other, and this is the case unless specifically limited otherwise.

Since a supply control system <NUM> for a tank according to an embodiment of the present disclosure is a system that is not applied to a conventional small amount-point supply method for supplying process material G (chemical products) stored in each of the small cylinders to a semiconductor manufacturing device <NUM> through a supply cabinet, but is applied to a large amount-centralized supply method utilizing a plurality of tanks 110a-110d, a process material flow rate GF discharged from each of the tanks 110a-110d may be individually controlled, a replacement cycle of each of the tanks 110a-110d may be efficiently managed, and even if any one of the tanks 110a-110d is replaced or an abnormality occurs in a pipe, a fixed amount of process material required for the semiconductor manufacturing device <NUM> may be stably supplied.

In order to specifically implement the functions and features as described above, the supply control system <NUM> for a plurality of tanks according to an embodiment of the present disclosure includes, for example, the plurality of tanks 110a-110d, a main-supply pipe 120a, sub-supply pipes 120b, flow control devices 130a-130d, a sensor <NUM>, a flow meter <NUM>, a back-up portion <NUM>, and a controller <NUM> as illustrated in <FIG>, and performs a series of processes illustrated in <FIG> such that process material (chemical products) is stably supplied to the semiconductor manufacturing device <NUM>.

Here, the semiconductor manufacturing device <NUM> may be, for example, a Chemical Vapor Deposition (CVD) device for receiving process material and for chemically depositing a coating material on a surface of a substrate; an etching device for etching deposited portions; or a device for cleaning etched portions.

In the present disclosure, a plurality of tanks having the same storage capacity may be provided to ensure that process material is stably supplied to the semiconductor manufacturing device <NUM> for a long period of time.

The tanks 110a-110d may include, for example, an outlet coupled to the sub-supply pipe 120b as described below and configured to discharge the stored process material to the outside, a cylindrical structure frame (not shown) for supporting edges, a load cell <NUM> for estimating the remaining amount of stored process material, and a pressure sensor <NUM>, respectively.

At this time, the load cell <NUM> is a component for estimating the remaining amount of the stored process material by measuring the weight of each of the tanks 110a-110d that change according to discharging of the stored process material, and may be a variety of commercial products which include, for example, a piezoelectric element positioned between an installation surface having the tanks 110a-110d placed thereon and the tanks 110a-110d.

Estimation of the remaining amount of the stored process material in each of the tanks 110a-110d by using the load cell <NUM> may be made by the controller <NUM> to be described below, which receives, in real time or at set time intervals, information on the weight of each of the tanks 110a-110d measured by the load cell <NUM> under electrical coupling with the load cell <NUM>.

As an example, the controller <NUM> may estimate the remaining amount of process material in each of the tanks 110a-110d by calculating, based on the initial weight of each of the tanks 110a-110d with full process material, the weight ratio between the tanks 110a-110d which is measured in real time while process material is discharged.

The pressure sensor <NUM> may be a component for measuring the internal pressure of each of the tanks 110a-110d capable of changing according to discharging of the stored process material from each of the tanks 110a-110d in order to estimate complementarily the remaining amount of the stored process material in the tanks 110a-110d in cooperation with the load cell <NUM>, and may be any of a variety of commercial products for generating a predetermined electrical signal according to the internal pressure of each of the tanks 110a-110d by being installed to communicate with the internal space of each of the tanks 110a-110d.

Estimation of the remaining amount of process material in each of the tanks 110a-110d by using the pressure sensor <NUM> may be also made by the controller <NUM> to be described below, which receives, in real time or at predetermined time intervals, information on the pressure between the tanks 110a-110d which is measured by the pressure cell <NUM> under electrical coupling with the pressure sensor <NUM>.

As an example, the controller <NUM> may estimate the remaining amount of process material in each of the tanks 110a-110d by calculating, based on the initial pressure of each of the tanks 110a-110d with full process material, the pressure ratio of each of the tanks 110a-110d measured in real time while process material is discharged.

The main-supply pipe 120a may be a component which corresponds to a pipe for coupling the plurality of tanks 110a-110d to the manufacturing device <NUM> to ensure that process material discharged from the plurality of tanks 110a-110d is supplied to the manufacturing device <NUM>. Specifically, as illustrated in <FIG>, the main-supply pipe 120a may provide process material to the semiconductor manufacturing device <NUM> by communicating with a plurality of sub-supply pipes 120b, each coupled to the outlet of each of the plurality of tanks 110a-110d.

The main-supply pipe 120a may include, for example, a plurality of pipes divided into a predetermined length, a plurality of VCRs (fasteners) for hermetically jointing the plurality of pipes, and a regulator and a manual/automatic valve disposed between the plurality of pipes.

The flow control devices 130a-130d may be components which are provided in each of the sub-supply pipes 120b to control the process material flow rate GF discharged from each of the plurality of tanks 110a-110d, and may operate to control the discharged process material flow rate GF or prevent process material discharge, from the corresponding one of the plurality of tanks 110a-110d according to control commands from the controller <NUM> under electrical coupling with the controller <NUM>.

The plurality of flow control devices 130a-130d may be commercial electronic control valves which are implemented in various ways, such as by changing a cross-sectional size, that is, an opening rate, of the pipe through which a fluid such as process material flows, or by variably forming a bypass pipe.

On the other hand, it is preferable that the above-described flow control devices 130a-130d are commercial products integrated with a flow meter <NUM> for measuring the process material flow rate GF flowing through the sub-supply pipe 120b, and are configured to transmit information on the corresponding process material flow rate GF to the controller <NUM>. This is to check whether the process material corresponding to specific flow rate is discharged when the process material in each of the tanks 110a-110d is set to and discharged at different flow rates, as illustrated in <FIG>.

The sensor <NUM> may be a component which is provided in the main-supply pipe 120a to check whether the process material flow rate GF required for the semiconductor manufacturing device <NUM> is accurately supplied from each of the tanks 110a-10d, and may operate to measure in real time the process material flow rate GF and the process material supply pressure actually supplied to the semiconductor manufacturing device <NUM> through the main-supply pipe 120a by controlling the flow control devices 130a-130d as described above.

As illustrated in <FIG>, the sensor <NUM> may include, for example, the flow meter <NUM> for measuring the amount of process material flowing into the semiconductor manufacturing device <NUM> through the main-supply pipe 120a, and a pressure sensor <NUM> for measuring the internal pressure of the main-supply pipe 120a to complementarily estimate whether there is an abnormality in the process material flow rate GF in cooperation with the flow meter <NUM>.

At this time, the flow meter <NUM> may be, for example, any of various types of commercial products which, for example, use a differential pressure, use an area, use an electronic method, or use ultrasonic, and the pressure sensor <NUM> may be any of various types of commercial products which generate a predetermined electrical signal according to the internal pressure of the main-supply pipe 120a as described above.

Both the information on the process material flow rate GF measured by the flow meter <NUM> and the information on the process material supply pressure measured by the pressure sensor <NUM>, as described above, may be transmitted to the controller <NUM>, and may be utilized to determine a malfunction or failure of the flow control devices 130a-130d or a process material leakage from, for example, a pipe connection.

The back-up portion <NUM> is a component which is provided to stably supply process material to the semiconductor manufacturing device <NUM>, and may include, for example, a back-up tank 150a, a flow control device 150b, and a load cell <NUM>, and a pressure sensor <NUM> as illustrated in <FIG>.

Here, the back-up tank 150a may be a component for discharging the stored process material when there is an abnormality in supplying process material to the semiconductor manufacturing device <NUM> and may be installed to communicate with the main-supply pipe 120a while having process material stored therein, as in the tanks 110a-110d.

At this time, the storage capacity of the back-up tank 150a may be the same as those of the tanks 110a-110d, and may be appropriately changed taking into account, for example, the number of tanks 110a-110d and the process material flow rate GF supplied to the semiconductor manufacturing device <NUM>, if necessary.

The flow control device 150b is a component for controlling the process material flow rate GF discharged from the back-up tank 150a, the load cell <NUM> is a component for measuring the weight of the back-up tank 150a, and the pressure sensor <NUM> is a component for sensing the internal pressure of the back-up tank 150a. The above components may have the same configuration as the flow control devices 130a-130d, the load cell <NUM>, and the pressure sensor <NUM> as described above, except for what they are installed on.

The back-up portion <NUM> may be electrically coupled to the controller <NUM>, and may selectively and supplementally discharge the stored process material to the main-supply pipe 120a through the flow control device 150b according to the determination and operation control by the controller <NUM>. As a result, the back-up portion <NUM> may stably supply the set fixed amount of process material flow rate GF to the semiconductor manufacturing device <NUM>.

On the other hand, the load cell <NUM> and the pressure sensor <NUM> included in the back-up portion <NUM> may be provided to estimate the remaining amount of process material stored in the back-up tank 150a, respectively, as in the tanks 110a-110d.

The controller <NUM> may be a component which is electrically connected to, for example, the load cells <NUM>, <NUM> and the pressure sensors <NUM>, <NUM>, <NUM> of the tanks 110a-110d, the flow control devices 130a-130d, the sensor <NUM>, and the back-up portion <NUM>, respectively, applies control power and signals to these components to control their operation, and receives and processes measured information or data. The controller <NUM> may include, for example, a modular information processing unit such as a micro controller unit (MCU), a microcomputer, an Arduino, or a Programmable Logic Control (PLC); a display (not shown) for communicating, for example, processed information; and an input device (not shown) for user setting.

A series of processes and algorithms, which may allow the controller <NUM> to control each of the components coupled thereto and may process transmitted and received data and the like, may be coded in a programming language, such as C, C++, JAVA, and machine language, which is readable by the information processing unit.

At this time, the coded algorithms for a series of operations and data processes performed by the controller <NUM> may be made in various ways and forms by those skilled in the art, and thus detailed descriptions thereof will be omitted.

However, reference to <FIG> will be made below to explain what series of control operations are used by the controller <NUM> according to an embodiment of the present disclosure to stably supply and manage the set process material flow rate GF from the plurality of tanks 110a-110d to the semiconductor manufacturing device <NUM>.

First, as illustrated in <FIG>, the controller <NUM> receives, through an input device, information on the process material flow rate GF to be continuously supplied to the semiconductor manufacturing device <NUM> and stores the received information. At this time, the process material flow rate GF to be continuously supplied to the semiconductor manufacturing device <NUM> may be set or determined by an operator taking into account, for example, an overall scale or an operation situation of the semiconductor manufacturing device <NUM>.

As an example, when the process material flow rate GF supplied daily for a week is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> (in units of GPM or LPM) respectively, the final process material flow rate GF to be supplied may be set as <NUM> = <NUM> (average value) × <NUM> (safety factor) (see <NUM>%GF in <FIG>).

As described above, the process material flow rate GF set to be supplied to the semiconductor manufacturing device <NUM> is a set value that may be converted into a corresponding process material supply pressure and arbitrarily changed according to circumstances, and hence may be used as a reference for the control operation by the controller <NUM> (S100).

Next, when the process material flow rate GF to be continuously supplied to the semiconductor manufacturing device <NUM> is set, the controller <NUM> controls each of the flow control devices 130a-130d according to the flow ratio of each of the tanks 110a-110d such that process material is supplied to the semiconductor manufacturing device <NUM>, as illustrated in <FIG>.

At this time, when four tanks, that is, the first, second, third, and fourth tanks 110a-110d are provided as illustrated in <FIG>, assuming that the process material flow rate GF previously set to be supplied to the semiconductor manufacturing device <NUM> is <NUM>%, each of the tanks 110a-110d may be set to supply process material at a ratio of <NUM>%, <NUM>%, <NUM>%, and <NUM>%, respectively.

As described above, discharging process material stored in each of the four tanks 110a-110d at different flow rates is to allow the tanks 110a-110d to experience exhaustion of process material and replacement, not simultaneously but sequentially.

Since the tanks 110a-110d are sequentially replaced, process material may be efficiently and stably supplied to the semiconductor manufacturing device <NUM> without interruption, and the plurality of tanks 110a-110d may be efficiently maintained.

The controller <NUM> controls the plurality of flow control devices 130a-130d to operate at different opening rates, such that the flow ratio of each of the tanks 110a-110d set as described above may be reflected (S200).

Next, as illustrated in <FIG>, the controller <NUM> measures and monitors, through the sensor <NUM>, the process material flow rate GF and the process material supply pressure supplied to the semiconductor manufacturing device <NUM> through the main-supply pipe 120a. At this time, the measurement by the sensor <NUM> may be performed in real time or at regular time intervals under the control of the controller <NUM> (S300).

Next, as illustrated in <FIG>, in the process of monitoring the process material flow rate GF and the process material supply pressure measured as being supplied to the semiconductor manufacturing device <NUM> through the main-supply pipe 120a, the controller <NUM> determines whether an abnormality exists, that is, whether the measured process material flow rate GF (or the measured process material supply pressure) is the same as the set process material flow rate GF (or the set process material supply pressure) within a predetermined range.

Here, the predetermined range may be changed according to the manufacturing process situation or the operation on-site, and may generally be determined within a range of <NUM>% to <NUM>% based on the process material flow rate GF (or the process material supply pressure) set to be supplied to the semiconductor manufacturing device <NUM>.

First, in this step, when the controller <NUM> determines that the measured process material flow rate GF (or the measured process material supply pressure) is lower than the set process material flow rate GF (the set process material supply pressure) by a predetermined range or more, the controller <NUM> controls the operation of the back-up portion <NUM> as illustrated in <FIG>. That is, the controller <NUM> controls the back-up portion <NUM> to open the flow control device 150b such that the process material flow rate GF corresponding to a shortage (see <NUM>%GF in <FIG>) is supplemented to the main supply pipe 120a by the back-up tank 150a.

When there is a shortage (see <NUM>%GF in <FIG>) of the measured process material flow rate GF (the measured process material supply pressure) based on the set process material flow rate GF (the set process material supply pressure), this control for the back-up portion <NUM> is performed immediately.

However, subsequently, when the shortage of the process material flow rate GF is not temporary and persists for a predetermined period of time or more (for example, <NUM> minute), the controller <NUM> cancels the control described above for the back-up portion <NUM>, and switches to the control for increasing the opening rate of each of the flow control devices 130a-130d provided in each of the tanks 110a-110d such that the process material flow rate GF corresponding to the shortage (see <NUM>%GF in <FIG>) is supplemented to the main-supply pipe 120a.

Here, increasing of the opening rate of each of the flow control devices 130a-130d provided in each of the tanks 110a-110d may be made for all flow control devices 130a-130d at the ratios <NUM>:<NUM>:<NUM>:<NUM> corresponding to the flow ratio <NUM>%, <NUM>%, <NUM>%, <NUM>% of the tanks 110a-110d at the same time. When process material exhaustion of a specific one of the tanks 110a-110d is preferentially required, the control may be performed for increasing the opening rate of only one of the flow control devices 130a-130d that corresponds to the specific one of the tanks 110a-110d.

The shortage of process material flow rate GF as described above may occur due to various factors, such as a temporary delay occurring in the semiconductor manufacturing device <NUM>, an incorrect fastening in the connection of the main-supply pipe 120a or the sub-supply pipe 120b, an internal problem of the tanks 110a-110d, and a temperature change of the surrounding environment (S410).

On the contrary, in this step, when the controller <NUM> determines that the measured process material flow rate GF (or the measured process material supply pressure) is greater than the set process material flow rate GF (the set process material supply pressure) by a predetermined range or more, the controller <NUM> controls each of the flow control devices 130a-130d provided in each of the tanks 110a-110d.

That is, the controller <NUM> reduces the opening rate of each of the flow control devices 130a-130d provided in each of the tanks 110a-110d, such that the process material flow rate GF from the tanks 110a-110d is fundamentally prevented from being excessively discharged to the main-supply pipe 120a.

Here, reducing the opening rate of each of the flow control devices 130a-130d provided in each of the tanks 110a-110d may be made for all flow control devices 130a-130d at the ratios <NUM>:<NUM>:<NUM>:<NUM> corresponding to the flow ratio <NUM>%, <NUM>%, <NUM>%, <NUM>% of the tanks 110a-110d at the same time. When process material exhaustion of a specific one of the tanks 110a-110d needs to be suppressed, the control may be performed for reducing the opening rate of only one of the flow control devices 130a-130d that corresponds to the specific one of the tanks 110a-110d.

Over-supply of process material flow rate GF as described above may also occur due to various factors, such as a working situation occurring in the semiconductor manufacturing device <NUM>, an incorrect fastening in the connection of the main-supply pipe 120a or the sub-supply pipe 120b, an internal problem of the tanks 110a-110d, and a temperature change of the surrounding environment (S420).

When supplementation and control of the process material flow rate GF as described above are performed, the controller <NUM> also measures, through the sensor <NUM>, the process material flow rate GF and the process material supply pressure supplied to the semiconductor manufacturing device <NUM> through the main-supply pipe 120a, and thereby monitors whether the supplementation and control of the process material flow rate GF is normally achieved (S400).

Next, as illustrated in <FIG>, the controller <NUM> estimates or calculates the remaining amount of process material in each of the plurality of tanks 110a-110d by receiving, in real time or at a predetermined time intervals, information on the weight and information on the internal pressure of each of the plurality of tanks 110a-110d that are measured respectively by the load cell <NUM> and the pressure sensor <NUM> installed in each of the plurality of tanks 110a-110d, and then continues to monitor the remaining amount of process material in each of the plurality of tanks 110a-110d (S500).

At this time, the remaining amount of process material estimated using the load cell <NUM> may be estimated by comparing the weight of each of the tanks 110a-110d measured in real time while process material is being discharged with the initial weight of each of the tanks 110a-110d measured when process material is completely filled therein, and by calculating as the ratio obtained by applying a predetermined parameter to the compared result.

In addition, the remaining amount of process material estimated using the pressure sensors <NUM>, <NUM> may be estimated by comparing the pressure of each of the tanks 110a-110d measured in real time while process material is being discharged with the initial pressure of each of the tanks 110a-110d measured when process material is completely filled therein, and by calculating as the ratio obtained by applying a predetermined parameter to the compared result.

Next, as illustrated in <FIG> and <FIG>, the controller <NUM> determines whether process material in the specific tank 110a is exhausted while monitoring the remaining amount of process material of each of the tanks 110a-110d (S600).

At this time, when it is determined that process material in the specific tank 110a is exhausted, the controller <NUM> may perform the operation required to allow replacement of the specific tank 110a. As an example, the controller <NUM> may transmit a signal or notification for notifying a central system (not shown) or a responsible worker who operates the semiconductor manufacturing device <NUM> of the need to replace the specific tank 110a (S610).

While the specific tank 110a (the first tank) is being replaced in response to this replacement signal or notification from the controller <NUM>, the controller <NUM> additionally controls the remaining semiconductor manufacturing devices <NUM> such that each of the remaining semiconductor manufacturing devices <NUM> maintains the set process material flow rate GF.

Here, the additional control by the controller <NUM> may be achieved by controlling the back-up portion <NUM> such that process material is supplemented by the back-up portion <NUM>.

At this time, the controller <NUM> controls the flow control device 150b of the back-up tank 150a such that the back-up tank 150a discharges, into the main-supply pipe 120a, the process material flow rate GF (for example, <NUM>%GF) corresponding to the process material flow ratio (for example, see <NUM>%GF in <FIG>) that was previously being supplied by the tank 110a (the first tank) that is being replaced.

In addition, unlike the above, the additional control by the controller <NUM> may be achieved by controlling the remaining tanks 110b-110d such that process material is supplemented by the remaining tanks 110b-110d excluding the tank 110a (the first tank) that is being replaced.

At this time, the controller <NUM> increases the opening rate of the specific one of the flow control devices 130b-130d such that the specific one of the remaining tanks 110b-110d discharges, into the main-supply pipe 210a, the process material flow ratio (for example, see <NUM>%GF in <FIG>) that was previously being supplied by the tank 110a (the first tank) that is being replaced. This discharge may be achieved by allocating an additional flow ratio (referring to <FIG>, sequentially, additional <NUM>%GF for <NUM>%GF, additional <NUM>%GF for <NUM>%GF, additional <NUM>% for <NUM>%GF) to each of the remaining tanks 110b-110d based on the allocated flow ratio of each of the remaining tanks 110b-110d (see <NUM>%GF, <NUM>%GF, <NUM>%GF in <FIG>).

Finally, when the replacement of the tank 110a (the first tank) is completed, as illustrated in <FIG> and <FIG>, the controller <NUM> controls each of the flow control devices 130a-130d according to the predetermined flow ratio of each of the tanks 110a-110d such that process material is supplied to the semiconductor manufacturing device <NUM>.

At this time, as illustrated in <FIG>, unlike in <FIG> described above, when four tanks 110a-110d, that is, first, second, and fourth tanks 110a-110d are provided, the determined flow ratio of each of the tanks 110a-110d may be changed by the controller <NUM> such that process material in the remaining tanks 110b-110d, excluding the replaced first tank 110a, is exhausted sequentially.

That is, the controller <NUM> controls each of the flow control devices 130a-130d such that the first, second, third, and fourth tanks 110a-110d discharge the process material flow rate GF of <NUM>%, <NUM>%, <NUM>%, and <NUM>%, respectively, based on the process material flow rate GF (<NUM>%GF) set or determined to be supplied to the semiconductor manufacturing device <NUM> through the main-supply pipe 120a.

As described above, discharging process material stored in each of the four tanks 110a-110d at the changed flow rate, unlike in <FIG>, is to prevent two or more of the four tanks 110a-110d from being replaced at the same time. As a result, since the tanks 110a-110d may experience exhaustion of process material and replacement, not simultaneously but sequentially, process material may be efficiently and stably supplied to the semiconductor manufacturing device <NUM> without interruption.

Reflection of the changed flow ratio of each of the tanks 110a-110d as described above may be achieved by the controller <NUM> controlling the plurality of flow control devices 130a-130d such that the plurality of flow control devices 130a-130d operate at different opening rates, and the subsequent processes may be continuously performed through the repetition of the above-described processes as illustrated in <FIG>.

Claim 1:
A supply control system (<NUM>) for a plurality of tanks, comprising:
a plurality of tanks (110a-110d) for storing a large amount of process material (G) used to manufacture a semiconductor;
a main-supply pipe (120a) configured to communicate with sub-supply pipes (120b) respectively coupled to the plurality of tanks (110a-110d) and to supply process material (G) to a semiconductor manufacturing device (<NUM>); and
a plurality of flow control devices (130a-130d) respectively included in the sub-supply pipes (120b) and configured to control a process material (G) flow rate discharged from each of the plurality of tanks (110a-110d);
characterized in that the supply control system (<NUM>) for a plurality of tanks further comprises:
a sensor (<NUM>) included in the main-supply pipe (120a) and configured to measure in real time the process material (G) flow rate and a process material supply pressure supplied from each of the plurality of tanks (110a-110d) to the semiconductor manufacturing device (<NUM>);
a back-up portion (<NUM>) coupled to the main-supply pipe (120a) and configured to supplementally discharge the stored process material (G), such that process material (G) is stably supplied to the semiconductor manufacturing device (<NUM>); and
a controller (<NUM>) configured to control the plurality of flow control devices (130a-130d) and the back-up portion (<NUM>) based on information on the process material flow rate (GF) or information on the process material supply pressure measured by the sensor (<NUM>), such that a set process material flow rate (GF) is supplied to the semiconductor manufacturing device (<NUM>) through the main-supply pipe (120a).