Systems and methods for a controllable release of power supply in a mobile device

Systems and methods are disclosed for removing a power supply from a host unit running a computer program, without losing data or causing a cold boot. The present invention employs a retaining assembly for the power supply that delays removal of the power supply until shutting down of the computer program of the host unit. The system may further comprise a logic unit that estimates the period from initiating a power off for the unit, up to an actual shut down of the computer program.

TECHNICAL FIELD

The subject invention generally relates to power supply latching mechanisms and ore particularly to systems and methods for controllably removing a power supply from a host unit that runs a computer program, without loss of data associated with the host unit.

DESCRIPTION OF THE RELATED ART

Generally, portable or hand held electronic devices, such as cellular phones, laptop computers, bar code scanners and the like can include a replaceable and/or a rechargeable battery pack comprised of various battery cells. When one battery pack or a battery cell unit is depleted, it can be removed and replaced with another fully charged battery pack, with the depleted battery pack or unit being recharged or disposed of. A battery pack can typically include a sealed enclosure which contains rechargeable batteries. Contacts on the exterior surface of the battery pack mate with contacts on the electronic device or interior terminal contact, upon the battery pack being mounted on the electronic device.

Such battery packs employ various types of latching mechanisms to assemble with a host unit. One of the most common types of mechanisms is a simple plastic cantilever latch. This type of latch comprises a cantilever or beam which is anchored at one end and carries a latch element at the opposite end. The cantilever or beam is deflected in order to engage or disengage the latch. For such mechanisms, long cantilevers are preferred over short cantilevers because longer cantilevers allow for greater deflection, which in turn allows for greater latch engagement. Moreover, in order to make the plastic cantilevers strong, it is often necessary to make them thick. Thick cantilevers require greater effort than thin beams to deflect. If low efforts are desired, then the cantilever must be made thinner or longer.

An alternative to cantilever latches, are spring-loaded cam latches. In this type of latch, a metal leaf spring or coil spring is used to urge a latch member to an engaged position. The latch member often includes a camming surface which is engaged by an actuator element to move the latch member to a disengaged position. Spring-loaded latches have several advantages over cantilever latches. The metal springs provide a smoother, almost constant latch effort. It is easier to design latch mechanisms with the desired latch force, travel and feel without the trade-offs of cantilever latches. The space requirements for spring-loaded latching mechanisms is often less than cantilever latches, which is important as electronic devices become smaller and more portable.

Generally, it is possible that such latching mechanism disengage a battery, or a removable power supply, as a result of unintentional or accidental circumstances. Such disengagement of a battery pack from a host unit can increase a risk of damage to the host unit, as well as the battery pack, and can also cause a loss of data. In particular, for many electronic devices that employ volatile memories or caches, a loss of power prior to a proper shut down of the unit can erase the memory and associated computer programs, applications, and/or software.

One approach to mitigate a loss of data contained in a volatile cache is the use of a supplemental battery to power the cache or other memory elements. If a host system's power is lost, data contained within the cache is retained because memory continues to be powered by the battery. When system power is restored, the system resumes normal operation and valid data still resides in the cache waiting to be written-back to disk. This solution is dependent upon the battery having power to retain the memory in the cache for a period that the system has no power. If the battery is exhausted during the interval when there is no system power, data contained in the cache will be lost. Because battery power is finite and memory circuits such as dynamic memory devices require refreshing at regular intervals, i.e. consuming power at a fairly high rate, special care must be taken that the battery has the capacity to retain the data. Nonetheless, batteries sometimes suffer from reliability problems that may result in premature failure, so the loss of data in a battery-backed cache may still occur.

At the same time, as clock speeds for various electronic circuits increase and portable host units become ever increasingly adaptable to operate with clients' proprietary applications and/or software, the time required for a proper shut down of the system, i.e. close of the associated programs after an initial powering off, has increased dramatically. As such, a battery removal from the host unit even after an initial powering off, and before a proper shut down of the system, can still cause a loss of data and/or cold boot of the system to occur. Such a cold boot can create significant problems in the host unit systems, for example by damaging the integrity of data files stored thereon or erasing a proprietary application and software.

Therefore, there is a need to overcome the aforementioned deficiencies associated with conventional devices.

SUMMARY OF THE INVENTION

The present invention provides for methodologies and systems for a proper shut down of host unit(s) having a removable power supply, e.g. a battery cell. Such shut down minimizes a risk for host unit's data loss and/or cold boot and can occur during or prior to battery removal.

In one aspect of the subject invention methodologies and systems are provided for detaching a battery from a host unit in a controlled manner after powering down of the unit. The system employs a latch/catch mechanism that enables a battery removal in several stages. The latch/catch retaining assembly is adapted so that after initiating a powering down for a host unit, there is ample time for a proper shut down, (i.e. close of computer programs, applications, or the like without data loss), before removal of the battery or power supply. Accordingly, a risk for a cold boot and/or a power jolt for the host unit is reduced.

One exemplary aspect according to the present invention provides for removal of a battery pack in a dual stage, after initiating a powering off for the host unit. A latch/catch mechanism having movable latch members and catch elements is provided as part of the host unit. Such mechanism is adapted for enabling a user to remove the battery package from the host device in two stages. Initially, by pushing a button(s) operationally connected to a first movable latch member, the battery is released from a catch element to a certain extent, such that it still remains operative with the host unit. In a second stage, by pressing secondary latch member(s), the battery is detached and operatively fully disengaged from the host device. Such dual stage mechanism induces a delay period in an operator's routine attempt to change battery, (e.g. 1 sec.-3 secs.), which in turn allows the proper shut down of the host device. Accordingly, a proper shut down occurs after initiating a power down and before the battery is operatively disengaged from the host unit.

In another aspect of the present invention an attempted removal of a battery, before a powering off for the unit, triggers an auto shut down mechanism. Such auto shut down mechanism, in conjunction with the multi stage removal procedure, can provide a necessary time delay for the unit to shut down properly before the battery is operatively disconnected from the host unit. The auto shut down mechanism can comprise a switch that is triggered upon the contact pins of the battery being slightly pulled out form their respective sockets in the host device.

In another aspect, the subject invention provides for a battery disengagement procedure and assembly that is tied up and operatively coupled to a software program, such as an application of the host unit. This is advantageous, for example, when an application employed by the host unit requires a specific time delay period for its proper shut down after initiating a powering down of the host unit. Thus, only after such time delay should the battery power disconnect from the unit. Otherwise, a cold boot of the host unit can occur.

According to one aspect of the present invention, the disengagement assembly provides for a locking mechanism of the battery compartment via employing an actuator and a sliding pin mechanism. When the host unit is powered off, and upon the proper closing of the applications, the locking mechanism is gradually released to unlock the battery compartment and permit access to the battery. Such method of disengagement provides for a battery release from the host unit that is adaptable to the type of applications loaded on the host unit at the time. Such adaptability proves advantageous should users employ their proprietary soft ware and application with the host unit. For example, a user may employ the unit with an application that after powering off for the unit requires a 10 second time frame to close properly and save the required data. If the battery is operatively disconnected prior to 10 seconds, a cold boot will occur. An emergency unlocking mechanism can also provide access to the battery chamber in case the application or the associated software program of the host unit fails, e.g. host unit freezes.

In one aspect of the present invention, the emergency unlocking mechanism can be a mechanical latch and catch design that can be opened by inserting an object therein, e.g. by inserting a paper clip and unlocking the latch mechanism. Moreover, according to another exemplary aspect of the present invention, an actuator assembly may be employed to eject the battery form the compartment upon pressing a button on the host unit and after initiating a powering down.

According to another aspect of the present invention an artificial intelligence element is provided as part of the unlocking mechanism. Based on a host unit's application or computer program, an artificial intelligence element can provide an estimate for the time required to properly shut down the host system after initiating a power off. Such estimate can be based on prior instances that the unit has been powered off and the actual time it took for closing of all programs and proper shut down of the unit. The time estimate can also be provided by an operator to the host unit. The time estimate is subsequently supplied to the unlocking mechanism for permitting access to the battery compartment.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. However, these aspects are indicative of but a few of the various ways in which the principles of the invention may be employed. Other aspects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the drawings. Also, to facilitate the reading of the drawings, some of the drawings may not have been drawn to scale from one figure to another or within a given figure.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides for methodologies and systems for a proper shut down of a host unit with removable power supply. The host unit employs a power supply locking and release assembly adapted to avoid loss of data from a cold boot and/or a power jolt, while removing the power supply. The invention can be applied to any portable electronic unit having a removable power supply, such as a mounting battery. Examples of portable electronic devices include; a portable hand scanner unit or bar code reader, transmitter, receiver, computer, personal electronic organizers, electronic navigation devices, and any electronic unit having an auxiliary battery power with a removable battery cell.

Referring initially toFIG. 1, an exemplary schematic system is illustrated that hosts a battery coupled to a release mechanism according to one aspect of the present invention. The host unit12can have an operating system11regulated by a powering off component15that controls the host unit's power. The host unit12derives its power from a battery unit(s)10contained within a housing14. The operating system11and an associated CPU (not shown) interact with a data storage assembly17.

The data storage assembly17typically includes an array of memory cells, wherein each memory can be manufactured in accordance with a 1 Mbit, 2 Mbit, 8 Mbit or similar storage cells and as a volatile memory IC. Such memory cells can have two or more states corresponding to various levels of impedance. These states are set by applying a bias voltage, and then the cells remain in their respective states until another voltage, in reverse bias, is applied. Accordingly, each memory cell of data storage17can be accessed or “read”, “written”, and “erased” with information. The memory cells maintain information in an “off” or an “on” state (e.g., storage is limited to 2 states), also referred to as “0” and “1”. To store this information, a memory cell may include a capacitor structure that permits storage of a charge allowing the memory cell to keep a single bit of information. Such memory cells typically employ a refresh signal to maintain the charge on the capacitor and/or their information. Some examples of the memory storage17are memory devices such as dynamic random access memory (DRAM), double data rate memory (DDR), flash memory, metal oxide semiconductor field effect transistor (MOSFET), and the like.

The host unit12further comprises a battery housing14having a multi stage release assembly that permits detaching battery10therefrom in a controlled manner. The release assembly comprises the battery housing14, a first catch and latch mechanism, which can be positioned laterally to the battery housing14, and a second catch and latch mechanism30.

The first catch and latch mechanism can include a pair of buttons20extending from the exterior of the battery housing14. The buttons20can be fabricated from the same materials employed for fabricating the battery housing14and can include various types of thermoset plastic or thermo plastic material, and the like. In addition, the buttons20can further include a flex spring sheet mechanism (not shown) attached to the interior of the battery housing14.

The buttons20can hinge on pins on their interior ends that contact the spring sheet mechanism, so that the spring sheet deflects when the buttons20are displaced. The buttons20can be positioned in a cavity of the battery housing14, e.g. an orifice, a channel and the like. In one exemplary aspect, when the spring sheet is deflected, the catch/latch mechanism of the buttons20release or catch a projection of the battery10. The buttons20can also include cams or wheels rotating on a shaft, at their ends that can deflect the flex spring sheet causing the release or engagement of the projection on the battery unit10.

FIG. 2illustrates a dual stage process for removing a battery cell22from a host unit21according to one aspect of the present invention. Upon inward squeezing of the buttons20as illustrated by the arrows19, the first latch/catch mechanism is released. Subsequently, the battery cell22slides out of the host device21to a predetermined length, for example ½″, and into an intermediate position as illustrated. This predetermined length is selected such that the battery cell22still remains operatively coupled with the host unit21, and thus still provides power thereto. Put differently, a sliding out of the battery22to this intermediate position does not electrically disconnect the power from the host unit21. At this time, and when the battery cell22reaches this intermediate position, the secondary latch/catch mechanism30operates to withhold further sliding out of the battery from its compartment. In one exemplary aspect according to the subject invention, the secondary latch/catch mechanism30can include a notch32mounted on a strip34. The strip34can move perpendicular to a direction the strip34is extended when pressed at the disc shaped area35.

Upon the first latch/catch mechanism20being disengaged, the secondary latch/catch mechanism30, e.g. notch32, engages with an edge36of the host device21, thus creating a reactive force that acts in a direction opposite to sliding direction of the battery cell22. Such reactive force maintains the intermediate position for the battery22. By pressing a disc shaped area35on the strip34, the strip34moves downward and lowers the notch32from its engaged position. The disc shaped area can, for example, act as a thumb pad when pressed by an operator's thumb. The lowering of the strip34can continue until the notch34disengages from its contact with the edge36, thus allowing sliding out of the battery cell22from its compartment. During the period from releasing from the first latch/catch assembly and disengagement from its second latch/catch assembly, the battery cell22continues to provide power to the host unit21.

According to one aspect according to the present invention, this dual release methodology provides for a time delay, which serves as a period for allowing the host unit21to properly shut down. Put differently, there exists a time lag or delay from the time the host unit21is powered off, until the time that the unit closes all associated applications and/or software and actually shuts down. By delaying the battery cell removal from the host unit21for duration longer than a required shut down period, the subject invention provides for a proper shut down of the host unit after initiating its powering off. This avoids a possible cold booting of the system that can arise from a premature withdrawal of the battery cell22from the host unit21. For example, before associated applications and software programs have been properly closed and required data saved. The dual release methodology delays battery removal for about one to three seconds. Longer delay times can be achieved by additional catch/release mechanisms or by employing other aspects of the present invention as will be described hereinafter.

Referring now toFIG. 3a battery cell40removed from its compartment is depicted. The battery cell40can be a rechargeable battery comprised of a Lithium-Ion (Li-ion) Nickel-Cadmium (Ni—Cd), Nickel-Metal-Hydride (NiMH), Sealed-Lead-Acid (SLA), Lithium Polymer (Li-Pol)). Battery cell40can also be part of an array of battery cells assembled together as part of a power unit in an electronic device. The battery cell40can include side latch features42that function as part of a lateral catch/latch mechanism described earlier. A strip44having a wider width at one end45is secured via a pin set48over a trough46being formed on a surface of the battery cell40. The strip44can be fabricated from a conductive material such as copper, Aluminum or the like. At a selected section along the strip44, the metal is curved to from a notch52that acts as the secondary latch/catch mechanism described earlier. The pin set48secures the strip metal44such that it behaves as a cantilever member extending over the trough46. This allows for the strip44to move downward at a substantially perpendicular direction to the direction that the strip44extends. Upon exerting a down ward force at45, such as by pressing of a thumb, part of the strip44moves in to the trough46, thus lowering notch52and disengaging it from contacting a body of the host unit.

According to one aspect of the present invention, a safety switching mechanism can be provided as to trigger the automatic powering off for the host unit, should one attempts to remove the battery cell40without initially having powered off the host unit. Such safety switching mechanism for the host unit can be triggered, for example via a contact of a projection on the battery cell body with a lever, during sliding out of the battery sockets from the finger leads of the terminal internal connector47of the battery compartment. Typically, positive and negative battery sockets are engaged by resilient contact portions of the positive and negative finger leads which project into the battery cell cavities. For example, such a resilient member for a peripheral connector is shown as element49inFIG. 3. Similar elements (not shown) exist for the terminal internal connector47of the host unit.

FIG. 3aillustrates an exemplary schematic system with a safety switching mechanism. The safety switching assembly31is coupled with a powering off mechanism39, which in turn is operatively connected to a CPU33for regulating its powering off. Upon receiving a powering off notification alert generated via the safety switching assembly31, the powering off component39is prompted for an immediate shutdown of CPU33and saving of all required data into the data storage area. The notification alert can be in a form of a signal or a voltage change or any other electrical and/or mechanical stimulus. Such auto powering off for the host unit, in conjunction with the dual release methodology for the battery cell will lead to a proper shut down of the CPU unit33, when an there is an unintentional attempt for battery removal. Accordingly, the illustrated system can provide for a time delay, for example of about one to three seconds, which serves as a period that allows proper shut down to take place for the host unit. Such assembly provides an improved latching mechanism that permits a battery disengagement from a host unit with a time delay that is typically required for the proper shut down of the host unit. Accordingly, a cold boot that results in loss of system's data can be avoided. Desirable time delays may also be achieved by a tie-up of the host system's application and/or other software, with the battery release mechanism, as explained herein after.

Referring now toFIG. 4, an exemplary schematic is illustrated according to one aspect of the present invention. The illustrated latching system41for detaching a battery43from a host unit47is tied up to an application and/or software program being run by the CPU49of the host unit47. For example an application employed by the host unit47may require a ten second delay for its proper shut down. Accordingly, once a powering off for the unit has been initiated, a time delay of at equal ten seconds is required before the latching system41releases the battery43and operatively disconnects it from the host unit47. Otherwise, a cold boot will occur.

The depicted CPU assembly49can include a volatile semiconductor memory such as the static random access memory (SRAM) which is characterized by low power consumption and high memory cell density. The generation of valid logic signals and the retention of data in such integrated memory circuits having volatile memory cells depend in part on maintenance of power supply voltage within specified limits. A sudden loss of voltage, e.g. through a removal of the battery cell43without proper shut down of CPU49, will cause loss of any information stored in the memory cells, including programs and data. Although the loss of power does not necessarily result in memory circuit damage, the loss of stored information requires that the memory be reloaded with programs and data before processing can be resumed.

The battery cell(s)43is electrically connected to contacts on the interior of the battery compartment51which mate with corresponding contacts (not shown) on the electronic device47to supply it with power. The battery pack43is designed to be removably mounted to the electronic device47. A latch mechanism41secures the battery pack43to the host unit.

According to one aspect of the present invention, an actuator53is being operatively connected to the latch mechanism41of the battery compartment51. The battery compartment51can include a lid55, which can be molded separately from the same material as the battery compartment51, e.g., plastic and subsequently hinged thereto. A latch cavity57is formed on a wall of the battery component opposite the wall that the latching member56is attached. The purpose of the latch cavity57is to accept the latching member56.

In one aspect according to the present invention, the latch assembly41comprises a latching member56, as well as a latch cavity57formed on a side wall and operatively connected to an actuator53. The actuator53urges the latching member56to move between an extended position as illustrated and a retracted position (not shown). In the extended position, the latching member moves parallel to the lid55and through a retaining member61attached thereto. Once the latching member56is in the extended position the lid55, which permits access to battery compartment51can not be opened. Put differently, in an extended position the latching member56passes through the retaining member and locks into the cavity44. Accordingly, the lid55can no longer be opened. In a retracted position (not shown), the latching member56is being retracted out of the cavity57, as well as out of the retaining member61attached to the lid. Thus, the lid55of the battery compartment51can now be readily opened and the battery removed. It is to be appreciated that other mechanisms, such as electromagnetic assemblies, e.g. a solenoid, or the like may be employed alone or in combination with the actuator53to gradually release battery43form its compartment51.

The function of the actuator53can be tied up with the proper shut down of the applications and/or software associated with the host unit47and its CPU49. For example, the actuator53can urge a retracted position for latching member56upon receiving a stimulus from the CPU49alerting that the applications or soft wares of the host unit47have been properly shutdown. The stimulus can be in the form of a signal or a voltage change or any other electrical and/or mechanical impetus. The actuator53is thus prompted to adopt a retracting status, upon the system being properly shut down. Thereafter, a removal of the battery cell from the host unit47does not create a cold boot of the system. The battery can then be manually removed by opening the lid55.

According to another aspect of the present invention, the electronic device47can be supplemented with a mechanical emergency release assembly63. Such emergency release mechanism63can be employed when the application and/or software associated with the host unit do not function as intended. This may occur for example as a result of a “freezing” of the system. If so, the latch assembly41can be disengaged by a mechanical procedure, for example inserting a paper clip via an opening provided as part of the release assembly63. The inserted paper clip can then force the latch member56into a retracted position. The emergency release system63can be designed such that it is not readily accessible as to avoid unintentional access to it.

FIGS. 5aand5billustrate a battery compartment with a controlled latching mechanism in accordance with an aspect of the present invention. The battery compartment64is equipped with a pair of actuators68that can eject the battery61from its compartment64upon receiving a requisite stimulus. Such stimulus can be comprised of a user's request for removal of the battery pack, (e.g. by pressing a button), in conjunction with a notification by the CPU indicating that the host unit has been properly shut down. Upon receiving the proper stimulus the latch cavity adopts a retracted position as described earlier, (i.e. the latching member is being retracted out of the cavity and the retaining member attached to the lid). Thereafter, as illustrated inFIG. 5athe battery cell61is being pushed outwardly via a set of retracting/extending piston mechanism66. After the battery61is removed, the retracting/extending piston mechanism66can then be retracted to their original positions. It is to be appreciated that other ejecting/retracting mechanisms may also be employed. For example,FIG. 5billustrates an exemplary retracting mechanism comprised of coils springs67that may be applied for retracting an ejected battery back in to the battery compartment. The coil spring retracting mechanism67may also be employed with various other extending structures that are activated via an actuator.

In another aspect according to the present invention, and as illustrated inFIG. 6the system employs an artificial intelligence unit70operatively connected with the unlocking mechanism72and the CPU unit71of the host device74. The artificial intelligence unit70provides a conservative time estimate of a required period for a proper shut down of CPU71and associated application to take place, after host device74is powered off. Such conservative estimate can, for example, be based on prior instances that the unit has been powered off and the time it actually took for closing of all application and proper shut down of the unit. During the normal use of host unit, such prior occasions of periods between powering off for the unit and actual shutting down of the system can be recorded by the logic unit and employed for deriving the conservative time estimate. Such time estimate can also be provided by an operator to the host unit. The time estimates are subsequently supplied to the unlocking mechanism for operating access to the battery compartment.

Referring now toFIG. 7a, a flow chart illustrating a sequence of events according to one aspect of the present invention is illustrated and compared to conventional devices as illustrated inFIG. 7b. The system ofFIG. 7aemploys a dual latch mechanism as described earlier. At76the host unit employing a removable battery cell is being powered off for battery replacement purposes. Subsequently, at77the first latch mechanism is disengaged and the battery cell slides to an intermediate position. At this intermediate position the battery cell continues to provide power to the host unit. While a user is trying to disengage the battery cell from a secondary latch mechanism, the actual shut down of the system occurs at78. Next at79, the user releases the battery cell from a secondary latch mechanism. Such a methodology provides for an adequate time delay between releasing the first set of latches at77and the second set of latches at79. Such a delay period can exceed the time frame required from an initial powering off until a proper shut down of a host unit. Accordingly, removal of battery cell at80from the host unit occurs at a time after the unit has been properly shut down and a cold boot is avoided.

In prior art methodologies as illustrated inFIG. 7b, typically due to the simplicity of the associated applications and/or software, a powering off for the unit caused a rapid shut down of the system, (e.g. 1 to 2 milliseconds). As such, there was no requirement for an induced time delay before removal of the battery cell.

While the exemplary method is illustrated and described herein as a series of blocks representative of various events and/or acts, the present invention is not limited by the illustrated ordering of such blocks. For instance, some acts or events may occur in different orders and/or concurrently with other acts or events, apart from the ordering illustrated herein, in accordance with the invention. In addition, not all illustrated blocks, events or acts, any be required to implement a methodology in accordance with the present invention. Moreover, it will be appreciated that the exemplary method and other methods according to the invention may be implemented in association with a dual staged battery release latch illustrated and described herein, as well as in association with other systems, such as a multi-staged release latch or other apparatus not illustrated or described.

Referring now toFIGS. 8a&8b, a flow chart and sequence of events is illustrated according to another aspect of the present invention for removing a battery. The systems ofFIGS. 8a&8bemploy a latch mechanism that includes an actuator as described earlier. InFIG. 8a, at82a user requests a battery change, for example by pressing a respective button for ejecting the battery. Next and at84, the unit is being powered down. The powering down of the system may occur automatically upon request for a battery change, or performed manually by a user. Thereafter, at86a stimulus is provided to the latch mechanism and the application as well as other software associated with the host unit is shut down at88. Upon actual shut down and close of the associated application and/or software, the latch mechanism will act on the stimulus provided, and initiates disengagement of the battery cell from the catch/latch assembly at90. Accordingly, the illustrated methodology allows for a release of the battery that is tied up to the shut down of the associated application and/or designated software of the host unit. The release may further include automatically ejecting the battery from its compartment.

InFIG. 8bafter a users request for battery change at92, a logic unit associated with the host device performs a conservative estimate93of the time duration required for a proper shut down of the application and the associated software of the host unit. This conservative estimate can, for example, be based on prior periods between the powering off for the unit and the actual shutting down of the system during normal use of the host unit. It can also be based on the input provided by a user of the host unit requesting a predetermined time delay between powering off and battery ejection. Next, at94powering down is initiated for the host unit and its processor. Thereafter, at95a stimulus is provided by the logic element to the latch assembly. The application and/or associated software properly shut down at96, after which the latch mechanism is opened at the end of the period estimated by the logic unit. Accordingly, such exemplary aspect of the subject invention provides for a flexible time period that can be adaptable to the requirements of the system. This typically assures that the system will not undergo a cold boot or lose data as a result of a power jolt from removal of the battery cell(s).

Although the invention has been shown and described with respect to certain illustrated aspects, it will be appreciated that equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of this specification and the annexed drawings. In particular regard to the various functions performed by the above described components (assemblies, devices, circuits, systems, etc.), the terms (including a reference to a “means”) used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure, which performs the function in the herein illustrated exemplary aspects of the invention. In this regard, it will also be recognized that the invention includes a system as well as a computer-readable medium having computer-executable instructions for performing the acts and/or events of the various methods of the invention.