Hot plate cooling system

A hot plate cooling system is provided, configured to cool a hot plate, including a chamber and a cooling module. The hot plate is placed in the chamber. The cooling module extends into the chamber and faces the hot plate. The cooling module includes a nozzle member, a shell member, and a discharge channel. The nozzle member faces the hot plate for spraying a working fluid onto the hot plate. The shell member has a receiving groove surrounding the nozzle member. The discharge channel is connected to the shell member and communicates with the receiving groove. When the nozzle member sprays the working fluid to cool the hot plate, the working fluid is conveyed through the nozzle member toward a surface of the hot plate, and the working fluid is sequentially discharged from the hot plate cooling system through the receiving groove to the discharge channel.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of Taiwan Patent Application No. 110104926, filed on Feb. 9, 2021, the entirety of which is incorporated by reference herein.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a hot plate cooling system, and, in particular, to a hot plate cooling system with a cooling module.

Description of the Related Art

During a semiconductor manufacturing process, such as a semiconductor wafer manufacturing process, a platform that may perform predetermined temperature control (e.g. baking) on a wafer is required in some of the manufacturing processes. Typically, a hot plate serves as a platform. Different temperature may be required to process different wafers. It would be inefficient for manufacturing process that requires the environment temperature to drop from high to low when natural cooling is used. In view of this, it is important to provide an efficient and smart system for temperature processing and control.

BRIEF SUMMARY OF THE INVENTION

In accordance with some embodiments, a hot plate cooling system is provided, configured to cool a hot plate, including a chamber and a cooling module. The hot plate is placed in the chamber. The cooling module extends into the chamber and faces the hot plate to cool the hot plate. The cooling module includes a nozzle member, a shell member, and a discharge channel. The nozzle member faces the hot plate for spraying the working fluid onto the hot plate. The shell member surrounds the nozzle member, and the nozzle member is arranged in the shell member. The shell member has a receiving groove surrounding the nozzle member. The discharge channel is connected to the shell member and communicates with the receiving groove. When the nozzle member sprays the working fluid to cool the hot plate, the working fluid is conveyed through the nozzle member toward the surface of the hot plate, and the working fluid is sequentially discharged from the hot plate cooling system through the receiving groove to the discharge channel.

The nozzle member has a main flow channel and a nozzle communicating with the main flow channel. The nozzle protrudes from the shell member.

The nozzle member has a plurality of nozzles accommodated in the shell member and surrounded by the receiving groove.

Each of the nozzles has an elongated structure, and the nozzles extend in different directions.

The cooling module further includes an air extracting device, disposed at the discharge channel for extracting the working fluid flowing through the receiving groove to the discharge channel.

The cooling module further includes a pneumatic device, disposed at a main flow channel of the nozzle member for spraying the working fluid from the nozzle member through the main flow channel.

The hot plate cooling system includes a receiving unit, a classifying unit, and a server unit. The receiving unit is configured to receive default information, sensing temperature information of the hot plate and obtaining status information. The classifying unit is electrically connected to the receiving unit and the classifying unit. The server unit is electrically connected to the pneumatic device. When the receiving unit determines that there is a difference between the temperature of the hot plate in the default information and the temperature of the hot plate in the status information, the receiving unit sends an alarm log to the classifying unit. The receiving unit sends the default information and the status information to the classifying unit. The classifying unit sorts out the default temperature information based on the default information, and sorts out the status temperature information based on the status information, and also sends the alarm log, the default temperature information and the status temperature information to the server unit. The server unit sends a control signal to the pneumatic device based on the alarm log, the default temperature information and the status temperature information.

The receiving unit receives pieces of status information from different time points, and delivers the pieces of status information to the classifying unit. The classifying unit sorts out pieces of status temperature information based on the pieces of status information, and delivers the pieces of status temperature information to the server unit. When the server unit determines that there is a difference among the pieces of status temperature information and receives the alarm log, the server unit sends the control signal to the pneumatic device and turns the pneumatic device on.

The pieces of status temperature information include a first status temperature information and a second status temperature information. The first status temperature information is received by the server unit before the second status temperature information is received. When the tendency of the first status temperature information toward the default temperature information is different from the tendency of the second status temperature information toward the first status temperature information, the server unit sends a warning signal to an external control unit.

The hot plate cooling system further includes a fluid detection assembly disposed in a main flow channel of the nozzle member and the discharge channel.

DETAILED DESCRIPTION OF THE INVENTION

FIG.1shows a schematic view of a hot plate cooling system100of an embodiment of the present invention. The hot plate cooling system100may be applied in a machine system for manufacturing one or more wafers in a semiconductor manufacturing process.

The hot plate cooling system100includes a chamber10, a hot plate20, and a cooling module30. The chamber10has an accommodating space SP. The hot plate20is disposed inside the accommodating space SP, and used for heating the wafer. The cooling module30is installed through the accommodating space SP of the chamber10, the cooling module30extends into the accommodating space SP of the chamber10from outside the chamber10for controlling or adjusting temperature, such as cooling, the hot plate20. The manufacturing process is thus performed in a predetermined temperature.

The cooling module30has multiple (two) nozzle members31, disposed on two opposite ends of the hot plate20, respectively. In other words, the nozzle members31are disposed on a first end E1and a second end E2of the hot plate20that are close to the nozzle members31, wherein the first end E1and the second end E2are opposite from each other, the nozzle member31is configured to spray the working fluid F, cooling the hot plate20. A shell member32is disposed near each of the nozzle members31, surrounding the nozzle members31. In other words, the nozzle member31is disposed inside the shell member32.

Referring toFIG.1andFIG.2, the shell member32has a receiving groove321surrounding the nozzle member31. The cooling module30further includes a discharge channel33, communicating with the receiving groove321of the shell member32. The receiving groove321is configured to receive the working fluid F sprayed or delivered from the nozzle member31, so as to recycle or discharge the working fluid F for temperature controlling, such as heat emitting, the hot plate20. The receiving groove321communicates with the discharge channel33, so as to discharge the sprayed working fluid F′ from the hot plate cooling system100.

In detail, when the nozzle member31sprays the working fluid F to cool the hot plate, the working fluid F is conveyed through the nozzle member31toward a surface21of the hot plate20. After that, the sprayed working fluid F, that is the working fluid F′, is received by receiving groove321, sequentially discharged from the hot plate cooling system100through the receiving groove321to the discharge channel33.

Referring toFIG.2, it should be noted that the nozzle member31has a main flow channel311and a plurality of nozzles312that are accommodated inside the shell member32and protrude from the shell member32. In other words, the height of the nozzle312is greater than the height of the shell member32in the z direction, and the nozzle312is closer to the hot plate20(seeFIG.1). As such, the hot plate20may be cooled by the working fluid F, and the cooling of the hot plate20may be accelerated, improving the efficiency of the manufacturing process, each of the nozzles312has an elongated structure, and each nozzle312extends in a different direction, the nozzle member31may include one nozzle312for spraying the working fluid F to cool the hot plate.

A pneumatic device34is disposed at the main flow channel311of the nozzle member31for spraying the working fluid F quickly and smoothly from the nozzle312through the main flow channel311. The pneumatic device34may also serve as an air supply unit, configured to provide the working fluid F, an air extracting device35, such as a blast blower, is disposed at the discharge channel33for extracting the working fluid F′ flowing through the receiving groove321to the discharge channel33. Other than accelerating the discharge of the working fluid F′, it may also collect the particles produced by the working fluid F during the cooling of the hot plate20, thereby improving the cleanliness of the manufacturing process.

FIG.3shows a schematic view of the sensing and temperature control of the cooling module30to the hot plate20. The cooling module30further includes a receiving unit301, a classifying unit302, and a server unit303.

The receiving unit301may receive, for example, one or more elements with given formulas, configured to sense the current status of the chamber10and/or the hot plate20, such as the temperature information, the humidity information, and the pressure information of the chamber10and/or the hot plate20, the receiving unit301is electrically connected to the classifying unit302. The classifying unit302may be a fault detection and classification (FDC) unit, configured to collect the data from the receiving unit301, the FDC unit may provide univariate and multivariate analyses based on the states and requirements of the manufacturing process, respectively.

The server unit303is electrically connected to the classifying unit302and the pneumatic device34. The server unit303may receive the information from the classifying unit302, and calculate an applicable control signal based on the information for controlling the pneumatic device34.

Regarding the temperature control by the cooling module30to the hot plate20, specifically, the receiving unit301first receives a piece of default information S0, such as a default recipe, so as to learn about the requirement in the manufacturing process for the temperature of the hot plate20. The hot plate20is then sensed to obtain a piece of status information S1including a data of the temperature status of the hot plate20, the default information S0includes the temperature information, the humidity information, and the pressure information of the chamber10and/or the hot plate20.

After that, the server unit303receives the alarm log SA, and the temperature information S0′ (the default temperature) and S1′ (the current temperature of the hot plate20) from the classifying unit302. Based on these information, a control signal C1is calculated, by which the pneumatic device34is controlled to be turned on/off.

The receiving unit301may detect the temperature of the hot plate20alternately, and deliver to the classifying unit302in real time. The classifying unit302receives the status information S1of different time points at given time intervals. The classifying unit302then sorts out the parts where temperature information is included from the status information S1, and delivers the status temperature information S1′ to the server unit303.

The server unit303compares the status temperature information S1′ of different time points, and controls the pneumatic device34to be turned on/off. For example, the server unit303receives a piece of status temperature information S1′ of the current status every other second (i.e. the receiving unit301is set to deliver a piece of the status information S1every other second), and compares the previously received status temperature information S1′ with the subsequently received status temperature information S1′. When the subsequently received temperature is lower than the previously received temperature, it shows that the manufacturing process is about to perform cooling. The default temperature information S0′ and the subsequently received status temperature information S1′ are then compared to generate the control signal C1for turning on the pneumatic device34.

As such, since the control signal comes from the server unit303that generates the control signal based on the information provided by the receiving unit301and the classifying unit302, compared with the traditional temperature adjusting method by using a temperature controller, the embodiments of the present disclosure use the original sensing status information to perform regulation of the temperature of the hot plate20without an additional temperature control signal, thereby improving the stability of the whole cooling module, preventing signals from fading.

When the deviation between the default temperature information S0′ and the status temperature information S1′ received by the server unit303and the deviation between the previous and subsequent status temperature information S1′ do not correspond, a warning signal MA is sent to the control unit P. For example, when the temperature value of the default temperature information S0′ is 90° C., and the previous (the first) status temperature information S1′ is 95° C., this means that the manufacturing process is going to perform a cooling operation (from 95° C. to 90° C.). However, when the subsequent (the second) status temperature information S1′ is 96° C., this means that the temperature of the hot plate20is rising (from 95° C. to 96° C.), which is abnormal, the server unit303thus sends a warning signal MA to the control unit P for the operator to handle this situation. In other words, the pieces of status temperature information S1′ at least include an earlier first status temperature information and a latter second status temperature information, wherein the first status temperature information is received by the server unit303before the second status temperature information. When the tendency of the first status temperature information toward the default temperature information S0′ is different from the tendency of the second status temperature information toward the first status temperature information, the server unit303sends a warning signal MA to an external control unit P, when the server unit303sends the warning signal MA, the control signal C1is also sent to the pneumatic device34to turn it off.

A normal close valve is used in the pneumatic device34. When the power is cut off or during other anomalies, the pneumatic device34may be turned off automatically to prevent any accidents.

Referring toFIG.4, fluid detectors GS1and GS2are disposed in the main flow channel311of the nozzle member31and the discharge channel33, configured to detect the flow or existence of the fluid, indicating if an abnormality has occurred. For example, when the valve of the pneumatic device34is closed, a flow of the fluid is detected in the main flow channel; or when the pneumatic device34is turned on and the valve is open, but no flow of the fluid is detected, the fluid detectors GS are electrically connected to the control unit P. When the abnormality occurs, a warning signal may be sent to the control unit P, a fluid detection assembly GS may consist of the fluid detector GS1and GS2.

A hot plate cooling system is configured to cool a hot plate, including a chamber and a cooling module. The hot plate is placed in the chamber. The cooling module extends into the chamber and faces the hot plate to cool the hot plate. The cooling module includes a nozzle member, a shell member, and a discharge channel. The nozzle member faces the hot plate for spraying the working fluid onto the hot plate. The shell member surrounds the nozzle member, and the nozzle member is arranged in the shell member. The shell member has a receiving groove surrounding the nozzle member. The discharge channel is connected to the shell member and communicates with the receiving groove. When the nozzle member sprays the working fluid to cool the hot plate, the working fluid is conveyed through the nozzle member toward the surface of the hot plate, and the working fluid is sequentially discharged from the hot plate cooling system through the receiving groove to the discharge channel.

The hot plate cooling system includes a receiving unit, a classifying unit, and a server unit. The receiving unit is configured to receive default information, sensing the temperature information of the hot plate and obtaining status information. The classifying unit is electrically connected to the receiving unit and the classifying unit. The server unit is electrically connected to the pneumatic device. When the receiving unit determines that there is a difference between the temperature of the hot plate in the default information and the temperature of the hot plate in the status information, the receiving unit sends an alarm log to the classifying unit. The receiving unit sends the default information and the status information to the classifying unit. The classifying unit sorts out the default temperature information based on the default information, and sorts out the status temperature information based on the status information, and also sends the alarm log, the default temperature information and the status temperature information to the server unit. The server unit sends a control signal to the pneumatic device based on the alarm log, the default temperature information and the status temperature information.

The embodiments of the present disclosure have at least one of the following advantages or effects. Through the arrangement of the nozzle member and the shell member of the cooling module, the working fluid may cool the hot plate smoothly, and the working fluid may be recycled instantly and effectively, achieving a fast and safe cooling operation. In addition, the pneumatic device that provides the working fluid in the cooling module is controlled by the server unit, which generates the control signal based on the information delivered by the receiving unit and the classifying unit. Compared with the traditional temperature adjusting method using a temperature controller, the embodiment of the present disclosure utilizes the original sensing status information to perform regulation of temperature of the hot plate without additional temperature control signals. This may improve the stability of the whole cooling module, preventing signals from fading, thus improving the overall efficiency and quality of the manufacturing process.