WO1993007556A1

WO1993007556A1 - Power supply control system

Info

Publication number: WO1993007556A1
Application number: PCT/JP1992/001254
Authority: WO
Inventors: Ryoji Ninomiya; Koji Nakamura
Original assignee: Kabushiki Kaisha Toshiba
Priority date: 1991-09-30
Filing date: 1992-09-30
Publication date: 1993-04-15
Also published as: DE4293171T1; JPH0594236A

Abstract

When a power switch (13a) is turned on, a power controller (13) judges whether a CPU (11) is in a suspend mode or in a boot mode. When the mode is the boot mode, a system (10) executes a predetermined reset procedure. When the mode is the suspend mode, the CPU executes a resume procedure, and a backup voltage feed circuit (14) switches the power supply from a voltage BAT supplied from a sub-power supply unit (16) to a voltage Vcc supplied from a main power supply unit (15), and outputs it as an RAMV. When the power switch is turned off, the power controller sends an interrupt signal to the CPU. Unless the suspend mode is set, the CPU and a system BIOS (12) execute predetermined reset procedure. After this reset procedure is completed, the power controller stops the supply of the operation voltage inclusive of the backup voltage to the system. When the suspend mode is set, the RAMV supplied to the CPU is changed from the voltage Vcc supplied from the main power supply unit to the voltage BAT supplied from the sub-power supply unit.

Description

Description Power supply control system

Technical field

The present invention relates to a power supply control system for a personal computer or the like that incorporates a main power supply device and a backup sub-power supply device and performs various processes by being supplied with a voltage from these power supply devices.

Background technology

Personal computers such as laptop and book-type personal computers have become widespread as small electronic devices that have improved portability and are easily transported. These personal computers have a built-in power supply such as a notebook, and can operate with an operating voltage supplied from the power supply. Further, the power supply is generally removable.

Also, recent personal computers have a resume function. When the power of the personal computer is off, the resume function saves the contents of registers and the like to a predetermined memory that has been backed up, and the supply of operating voltage to the computer system is resumed. At the same time, the saved data is restored to the register, thereby reproducing the operation state immediately before the power is turned off.

The resume function described above can be used in personal computers. It is realized by the control of the system basic input / output system (system BIOS) provided in the PC and the power controller that controls the power of the personal computer. The control is shown below.

When the power switch of the personal computer is turned off or when the operating voltage drops and a predetermined condition for stopping the supply of the operating voltage is satisfied, the power controller detects the operation or the state. . In response to this detection, the power supply controller sends a command to stop operating voltage supply (system power off request) to the system BIOS. The system BIOS responds to the system power off request and determines whether the resume mode or the boot mode is set. When the boot mode is set, the system BIOS sends a permission command (system pulse off command) to the operation voltage supply stop request to the power supply controller. The power supply controller responds to the system power off command, and stops supplying the operating voltage to each circuit component within the computer.

When the resume mode has been set, the system BIOS executes processing for saving the contents of registers and the like in the CPU to a predetermined backup memory. When this save processing is completed, the system BIOS sends a system power off command to the power controller. The power supply controller stops supplying the operating voltage in response to the system power off command, and supplies a backup voltage to predetermined components. In recent years, CPUs with power management functions such as the resume function It is being developed (for example, 386 ™ SL sold by Intel). This CPU has a boot mode and a suspend mode (resume mode), and has a predetermined flag that holds a data (flag) indicating which of the boot mode and the suspend mode described above is set. It has a register. Further, the CPU holds various data (system data) in a register built in the CPU in the suspend mode. Therefore, in suspend mode, it is necessary to supply a backup voltage to the CPU.

Each processing of the resume function in the personal computer to which the CPU is applied is executed as follows.

If the power switch of this personal computer is turned off or if a predetermined condition for stopping the supply of the operating voltage is satisfied due to a drop in the operating voltage, the power controller sends an interrupt signal to the CPU. Send. The CPU executes the system BIOS interrupt routine in response to this interrupt signal. At this time, if the data that specifies the suspend mode is set in its own predetermined register, the CPU fetches the contents of the register such as the external I0 register and sends the predetermined command to the power supply controller. Send out. In response to this command, the power supply controller stops supplying the operating voltage to the CPU from the main power supply, and supplies the backup voltage from the backup power supply. However, the operating voltage is always supplied to the power controller from the main power supply.

-Suspend mode is indicated in the specified register of the CPU. If the data is not set, the CPU determines that the boot mode is set and sends a predetermined command to the power controller. Power Control This setup roller also _c stops the supply of the operating voltage from the main power supply to the CPU in response to the frame down-de, when the power sweep rate pitch is turned on, CPU is suspend mode If set to, the power controller sends an interrupt signal to the CPU. The CPU executes predetermined resume processing (restore processing) in response to the interrupt signal, and reproduces the operation state immediately before the supply of the operation voltage is stopped.

If the CPU is in the boot mode, the power controller responds to the operation of turning on the power switch and supplies an active reset signal to the CPU. Further, the power supply controller starts supplying the operating voltage to each element of the system from the main power supply device, and thereafter sets the reset signal to the inactive state.

With the above operation, the resume function of the personal computer using the CPU having the power management function is realized.

However, in a personal computer using a CPU having a power management function, if the main power supply is attached to and detached from the main body of the personal computer when the personal computer is in an off state, a problem such as runaway of the CPU occurs. This is because the main power supply supplies the operating voltage to the power supply controller that controls the supply of the backup voltage to the CPU in the suspend mode, and the main power supply is removed from the personal computer. This is because the power controller stops operating. For example, when the above-mentioned personal computer is off and the CPU is in the suspend mode, when the main power supply is removed from the main body of the personal computer, the power supply controller stops operating. As a result, the backup voltage supplied to the CPU stops, and the CPU cannot maintain the contents of the saved register. For this reason, when the main power supply device is set in the personal computer again and the operating voltage is supplied to the power supply controller, it becomes impossible to execute the resume processing.

When the personal computer is in the off state and the CPU is in the boot mode, the backup voltage cannot be controlled by the power controller due to the attachment / detachment of the main power supply. May be supplied. The CPU runs away when the backup mode is supplied while the suspend mode is not set and the personal computer is off.

For the reasons described above, reliable power control is required for CPUs that have a power management function. .

An object of the present invention is to provide a power supply control system capable of reliably executing processing and control in a suspend mode or a boot mode in a data processing device such as a personal computer to which a CPU having a power management function is applied. It is to be. Disclosure of the invention

To achieve the above purpose, the main power supply and the sub power supply The power supply control system of the data processing device having a power supply switch for instructing the supply of the operating voltage to the data processing device or stopping the supply of the power supply to the data processing device; Output a selection signal for selecting either the power supply device or the sub power supply device, and when the operation of the power switch instructs the data processing device to stop supplying the operating voltage, Control means for outputting an output stop signal; and selecting means for selecting and outputting one of the voltages output from the main power supply and the sub power supply in response to the selection signal output from the control means. And storage means for storing data indicating whether or not the suspend mode is set. The storage means is referred to in response to an output stop signal output from the control means, and the suspend mode is set. Processing means for determining the presence or absence of the setting and outputting a switching signal according to the setting of the suspend mode; and the selecting means from the sub power supply device in response to the switching signal output from the processing means. A switching means for controlling the supply of power to the power supply to the on-off state.

With the configuration described above, in the suspend mode or the boot mode, the control of the voltage supplied from the main power supply device and the sub power supply device to the data processing device is reliably performed.

Further, the present invention prevents runaway of the CPU which occurs when the main power supply is detached from the personal computer when the data processing device is off. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a circuit configuration of a personal computer to which the present invention is applied, and FIG. 2 is a circuit diagram showing a configuration of the backup voltage supply circuit shown in FIG. Figure

FIG. 3 is a diagram showing the circuit connection configuration of the components of the backup voltage supply circuit and the peripheral components, and FIGS. FIGS. 5 (a) to 5 (h) are timing charts of the respective signals when the power supply changes from the power-off state to the on-state in the suspend mode. 6 (a) to (h) are signal timing charts when the power supply changes from the power-on state to the off state in the boot mode.

(a) to (h) are timing charts of each signal when the power supply changes from the on state to the off state in the suspend mode. o Best mode for carrying out the invention

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration of a personal computer to which the present invention is applied. The computer system 10 (hereinafter referred to as the system) is a set of system components. In this embodiment, the CPU 11 and the basic input / output system (system BIOS) particularly related to the power control operation are used. ) Only 12 is shown, and other components are omitted. CPU 11 is a register that holds data indicating whether suspend mode is set. It has 1 1a. The CPU 11 controls the entire system 10 and executes an interrupt routine of the system BIOS 12 in response to an interrupt signal from the power controller 13 described later. Further, the CPU 11 outputs a suspend status signal to the controller 13 and the backup voltage supply circuit 14 in response to whether or not the suspend mode is set.

The power controller 13 controls the supply of power to the system 10. More specifically, the power supply controller 13 has a power supply switch 13a. The switch 13a is not a switch for directly instructing the power on or off state, but a switch for instructing on / off switching. The power controller 13 detects that the power switch 13 a has been operated, and outputs an interrupt signal to the CPU 11. Further, the power controller 13 sends the drive signal to the backup voltage supply circuit 14, the main drive signal to the main power supply unit 15, and the drive signal according to the setting of the suspend mode or the boot mode. Send a reset signal to system 10. The power controller 13 performs serial communication with the system BIOS12.

The backup voltage supply circuit 14 responds to the drive signal and the suspend status signal, and outputs a voltage Vec supplied from the main power supply unit 15 and a voltage BAT supplied from the sub power supply unit 16. By selecting one of the two, the backup voltage RAMV such as the CPU 11 or RAM (not shown) is supplied to the system 10 and the power controller 13 o The main power supply unit 15 is controlled to be turned on (supply voltage) or off (stop voltage supply) in response to a main drive signal sent from the power supply controller 13. In the ON state, the main power supply unit 15 supplies the operating voltage +12 V and −9 V to the system 10 and supplies the voltage Vcc (+5 V) to the backup voltage supply circuit 14 and the system 10. ).

The sub power supply unit 16 incorporates a voltage generator such as a battery and supplies the voltage B A T to the backup voltage supply circuit 14.o

Next, a circuit configuration example of the backup voltage supply circuit 14 will be described with reference to FIG. In the backup voltage supply circuit 14, the suspend status signal sent from the CPU 11 is supplied to the gate of the N-channel FET (field effect transistor) 142 via the resistor 141. The source of FET 142 is grounded, and the drain is connected to the gate of N-channel FET 143. The source of FET 143 is grounded, and the drain is connected to the gate of P-channel FET145. The gate and source of the P-channel FET 145 are connected via a resistor 144. The voltage BAT supplied from the sub power supply unit 16 is applied to the source of the FET 145.

The drain of FET145 is connected to the input terminal BAT of the selection circuit 146. Also, input terminal of selection circuit 146

V IN is the voltage supplied from the main power supply unit 15

V cc is applied. Further, a drive signal is input to the control terminal SEL of the selection circuit 146 from the power supply controller 13. The selection circuit 146 selects the voltage V "applied to the input terminal VIN when the drive signal level is at the level, and selects the voltage BAT applied to the input terminal BAT when the level is at the" L "level. The RAMV is output to the system 10 and the power supply controller 13 as the knock-up voltage RAMV, and the RAMV output from the selection circuit 146 is connected to the FET 142 via the resistors 147 and 141. The gate is applied to the drain of the FET 142 and the gate of the FET 13 via the resistor 148.

The switching control circuit 140 is composed of the resistors 141, 147, 148 and the FETs 142, 143. Switching control circuit 140 performs on / off control of FET 145 in response to a suspend status signal sent from CPU 11. Switching control circuit 140 prevents an overcurrent from flowing through CPU 11 when the personal computer is off in the boot mode.

FIG. 3 shows a specific connection configuration between each component of the backup voltage supply circuit 14 and peripheral components.

In FIG. 3, the main power supply unit 15 has an AC adapter 151 that can be attached to and detached from the personal computer, a main battery 152 that can be attached to and detached from the personal computer, and a DC ZD C It consists of an inverter 153. The output voltage of the AC adapter 151 is supplied to the DC / DC converter 153 via the backflow prevention diode 154 and is also applied to the source of the FET 145 via the diode 155. The output voltage of the main battery 1 52 is It is supplied to the DC converter 153 via the diode 156 and is applied to the source of the FET 145 via the diode 155.

The DC / DC converter 153 operates in response to the main drive signal sent from the power controller 13 and transforms the voltage supplied from the AC adapter 151 or the main battery 152 ( DC to DC conversion), generates operating voltages of +12 V, 19 V and +5 V (V cc), and supplies them to the system 10 described above. The sub power supply unit 16 is a rechargeable battery And a backflow prevention diode 162. The sub power supply unit 16 is built in the personal computer body of this embodiment. The output voltage of sub-battery 161 is applied via diode 162 as the voltage BAT to the source of FET 145.

The selection circuit 146 includes a DC / DC converter 146a and a diode 146b. The input terminal of the DC / DC converter 146a is connected to the drain terminal of the FET 145. The DC / DC converter 146a responds to the drive signal sent from the power supply controller 13 and transforms the voltage supplied from the FET 145 to generate RAMV (+5 V). Further, +5 V output from the DC / DC converter 153 is applied to the anode of the diode 146 b. The selection circuit 146 is for backing up the voltage output from the D CZD C converter 146a or the diode 146b. Is supplied to the system 10 as RAM V. Further, the voltage RAMV is supplied to the power supply terminal of the power supply controller 13 via the resistor 13b and the backflow prevention diode 13d, and the monitor of the power supply controller 13 is provided via the resistor 13d. Supplied to the connection terminal.

The output voltage VI of the AC adapter 151 or the main battery 152 from the main power supply unit 15 is supplied to the power supply terminal of the power supply controller 13 as the operating voltage via the regulator 13c. Supplied. When the supply of the operating voltage from the regulator 13 c to the power controller 13 is stopped, the power terminal of the controller 13 (that is, the force source of the diode 13 b) is connected to the regulator. Grounded via 13c.

The backup voltage RAMV is also supplied to the resistors 144, 148 and CPU 11 in the switching control circuit 140, as described above with reference to FIG.

The CPU 11 outputs a suspend status signal to the switching control circuit 140 and the power supply controller 13. In this embodiment, the level suspend status signal is almost 0 V, and the level suspend status signal indicates that the output terminal of the CPU 11 for the suspend status signal is open, in other words. It means that it goes into a high impedance state.

Next, the operation of the above-described personal computer will be described with reference to timing charts shown in FIGS.

Figures 4 (a) to (! 1) show the operating voltage supply in the boot mode. The status and timing of each signal when changing from the supply off state to the on state are shown.

In the boot mode and when the personal computer is off, the FET 145 is off as described later, the DC / DC converter 146a does not output voltage, and the DC / DC converter Is turned off by the main drive signal, the selection circuit 146 does not output the backup voltage RAMV (Fig. 4 (h)). The CPU 11 outputs a "H" level suspend status signal (set to high impedance state) (Fig. 4 (b)). As a result, F ET 145 is turned off.

In this state, when the power switch 13a is pressed for a certain period of time as shown in Fig. 4 (a), the power controller 13 confirms that the power switch 13a has been turned on. Detect (Personal computer is off at the moment, so it can be determined that power switch 13a is on). O In response to this detection, power control 1 Step 3 determines whether the backup voltage RA MV is being supplied to the monitor terminal. In this case, as shown in FIG. 4 (h), RAMV is supplied, so the power supply controller 13 determines that the boot mode is set. Then, the power supply controller 13 sets the main drive signal to the “H” level (FIG. 4D). The DC / DC converter 153 is activated in response to the main drive signal becoming “H” level, and changes the operating voltages +12 V, -9 V, +5 V (V cc). And provide it to system 10 耠When the voltage V becomes +5 V, the power controller 13 responds to this by setting the drive signal to the “H” level and outputting a level reset signal for a certain period of time (Fig. 4 (e), (f), (g)) In response to the drive signal becoming the level, the selection circuit 146 outputs the voltage V "supplied from the main power supply unit 15 as RAMV ( Figure 4 (h)). Further, the system 10 performs an initial reset of the entire system 10 in response to the reset signal.

The timing charts in Fig. 5 (a :) to (h) show the state of each signal when the CPU 11 is in the suspend mode and when the personal computer changes from the power off state to the on state. Indicates timing.

As shown in FIGS. 5 (b) and 5 (h), in the suspend mode, and in FIG. When one of the personal computers is off, the CPU 11 outputs an "L" level suspend status signal (Fig. 5 (e)). Therefore, the FET 145 is turned on, and the voltage supplied from the main power supply unit 15 or the sub power supply unit 16 is supplied to the selection circuit 146. The DCZDC converter 146a transforms the supplied voltage and outputs it as the backup voltage RAMV to the CPU 11, switching control circuit 140, and power supply controller 13.

In the state described above, if the power switch 13a is operated for a certain period of time to turn on the personal computer (FIG. 5 (a)), the power controller 13 is turned on by the power switch. Detects the operation of switch 13a and backs up in response to this detection. Determines whether voltage RAMV (+5 V) is supplied to the monitor terminal. As shown in Fig. 5 (h), the power controller

The backup voltage RAM V (+5 V) is supplied to 13, and the power supply controller 13 determines that CPU 11 is in the suspend mode. After this, the power controller 13 sets the main drive signal to the level (Fig. 5

(d)). The D CZD C converter 153 is activated in response to the main drive signal becoming “H” level, and generates operating voltages +12 V, -9 V, +5 V (V cc). Is supplied to the system 10. When the Vcc reaches +5 V, the power supply controller 13 sets the drive signal to the “H” level in response to this (FIGS. 5 (e) and (g)). In response to the level of the drive signal, the D CZD C converter 146a stops operating, and the voltage V cc supplied from the main power supply unit 15 becomes the backup voltage RAMV. Is output.

After that, the power controller 13 sets the interrupt signal to "L" level for a certain period of time. In response to the interrupt signal, the CPU 11 restores (restores) the data saved in the suspend mode to a predetermined position, and reproduces a state immediately before the supply of the operating voltage is stopped. Further, when these processes are completed, the CPU 11 sets the "L" level suspend status signal to the "H" level (high impedance state) (FIG. 5 (b)). As a result, the FET 145 is turned off, and the supply of voltage from the AC adapter 151, the main battery 152 and the sub power supply unit 16 to the selection circuit 146 is stopped. The timing charts in Figs. 6 (a) to 6 (h) show the state and timing of each signal when the personal computer changes from the on state to the off state in the boot mode.

The power switch 13a is operated to stop supplying the operating voltage to the system 10 (Fig. 6 (a)), or the operating voltage output from the main power unit 16 is When the voltage falls below the predetermined value, the power controller 13 detects the switch operation or the voltage state and sets the interrupt signal to be sent to the CPU 11 to the level for a certain period (FIG. 6 (c)). . Further, the power supply controller 13 transmits a system power off request requesting the system BIOS 12 to stop supplying the operating voltage.

The CPU 11 and the system BIOS 12 respond to the system power off request and the interrupt signal, and refer to the register 11a to determine whether the suspend mode is set. If the CPU 11 determines that the suspend mode is not set, the CPU 11 maintains the suspend status signal at the “H” level (high impedance state) (FIG. 6 (b)), and the system BI 0 S 12 Outputs a system power off command that permits the power supply controller 13 to stop supplying the operating voltage.

The power controller 13 responds to the system power-off command, and sets the reset signal for the system 10 to the “L” level for a certain period of time (FIG. 6 (f)). The reset signal resets the system 10 initially.

After receiving the system power off command, the power controller 13 sets the main drive signal to "L" level. (Fig. 6 (d)). The DCZDC converter 153 of the main power supply unit 15 stops operating in response to the main drive signal. As a result, the supply of the operating voltage to the system 10 is stopped (FIG. 6 (g)). Further, the power controller 13 also sets the drive signal to "L" level (FIG. 6 (e) :). In response to this driver signal, the DCZC converter 146a is activated. However, the suspend status signal output from the CPU 11 is maintained at the "H" level (high-impedance state), which causes the switching control circuit 140 to turn off the FET 145. No voltage is applied to the CZD C converter 146a from the AC adapter 151, the main battery 152, and the sub power supply unit 16. Therefore, the backup voltage RAMV supplied to the CPU 11 and the power controller 13 becomes 0 V (FIG. 6 (h)).

By the above operation, in boot mode, One son computer evening turns off.

The timing charts in FIGS. 7A to 7H show the state and timing of each signal when the personal computer changes from the on state to the off state in the suspend mode.

The power switch 13a is operated for a certain period to stop supplying the operating voltage to the system 10 (Fig. 7 (a), or the operating voltage output from the main power unit 16). When the power supply voltage falls below a predetermined value, the power supply controller 13 detects the switch operation or the voltage state and sets the interrupt signal to be sent to the CPU 11 to the “L” level for a certain period (see FIG. 7 (c)) Sends a system power off request to system BI 0 S 12.

The CPU 1 and the system BIOS 12 respond to the system power request and the interrupt signal, and refer to the register 11a to determine whether or not the suspend mode is set. If it is determined that the suspend mode is set, the CPU 11 saves various data (system data) to a register (not shown) included in the CPU 11. Upon completion of the evacuation processing, the CPU 11 sets the suspend status signal to the “L” level (FIG. 7Cb)).

The power controller 13 sets the drive signal to the “L” level in response to the “L” level suspend status signal (FIG. 7 (e)). A time lag T L occurs from the time the interrupt signal is generated until the drive signal level becomes “L” level. During this time lag TL, a suspend status signal of a level higher than CPU11 is supplied to the switching control circuit 140. For this reason, FET145 turns on. As a result, a voltage is supplied to the DCZDC converter 146a via the FET 145.

Therefore, during this time lag, the DC / DC converter 1466a operates in response to the drive signal of the level sent from the power supply controller 13 to thereby perform the backup from the selection circuit 1446. Step voltage RAMV (+5 V) Power << Supplied to CPU 11, power controller 13 and switching control circuit 140 (Fig. 7 (h)). In addition, the power controller 13 sets the drive signal to the level and the main drive signal to the "L" level.

(Fig. 7 (d)). The DCZDC converter 153 of the main power supply unit 15 stops operating in response to the level main drive signal. This stops the supply of operating voltage from the main power supply unit 15 to the system 10 (Fig. 7

(g)).

Since the suspend status signal output from the CPU 11 is maintained at "L" level, the R AMV supplied to the CPU 11, the power controller 13 and the switching control circuit 140 is supplied. Is maintained at +5 V.

As described above in detail, according to the present invention, in an electronic device to which a CPU having a power management function is applied, a switching circuit including an element such as an FET and a power supply for detecting a setting of a suspend mode are provided. The controller makes it possible to reliably execute processing for the suspend mode and the boot mode and control the power supply voltage. Further, according to the present invention, useless consumption of power supply voltage can be reduced.

As the CPU 11, for example, a one-chip microprocessor known as 386 SL developed by Intel Corporation and a CPU having the same function can be used.

Further, in the related art, when the operating voltage is not supplied to the electronic device, that is, when the electronic device is in an off state, when the power supply unit is detached from the personal computer main unit, the CPU may be damaged. It is also possible to prevent running and the like.

For example, assume that the main battery 152 is removed from the main body of the computer in the boot mode and the personal computer is turned off. (Note that the AC adapter 151 is connected to the external AC power supply.) If not). In this state, the suspend status signal output from the CPU 11 is at the "H" level (high impedance state), and the FET 145 is off. Therefore, regardless of whether the main power supply unit 15 is attached or detached, no voltage is supplied to the DCZDC converter 146a, and the backup voltage RAMV maintains 0 V.

Next, it is assumed that the main battery 152 is removed from the main body of the computer in the suspend mode and the computer ⁰ is turned off. In the suspend mode and when the personal computer is off, the suspend status signal output from the CPU 11 is at the “L” level, and the FET 145 is on. Therefore, a voltage is supplied to the DCZDC converter 146a, and the backup voltage RAMV is 5V. In this state, when the main power supply unit 15 is removed, the supply of voltage to the regulator 13c stops, and the power supply terminal of the power supply controller 13 is grounded via the regulator 13C. Then, the operation of the power supply controller 13 stops. However, the suspend status signal remains at "L" level, and FET 145 remains on. Further, the drive signal remains at the level, and the DCZDC converter 146a continues to output the backup voltage RAMV. or, During the operation of the power controller 13, the backup voltage RAM V supplied to the monitor terminal of the power controller 13 is applied to the regulator 13 c via the backflow prevention diode 13 d. Supplied. The backup voltage RAM V is grounded in the regulator 13c.

In this state, when the main power supply unit 15 is attached again, the supply of voltage to the regulator 13c resumes, and the regulator 13C is connected to the power controller 13 Supply operating voltage to power supply terminal. At the same time, the backup voltage RAM V is supplied to the monitor terminal of the power controller 13. Power supply port —Laser 13 starts operating, detects that backup voltage R AMV is supplied to the monitor terminal, and determines that CPU 11 is in the suspend mode. The power controller 13 sets the drive signal to the “L” level in response to the determination of the suspend mode setting, whereby the DC / DC converter 146a keeps outputting the backup voltage RAMV.

The present invention can also be applied to the case where the supply of the operating voltage to the system 10 is started by a real-time clock (RTC) timer process (not shown) provided in the system 10. Can be.

Further, by providing the power supply controller 13 with a monitoring mechanism for monitoring whether or not the above-described predetermined processing is performed, more reliable control of the power supply voltage can be performed. For example, when the suspend status signal is at the “L” level, when the backup voltage RAMV is 0 V, or when the power supply When the CPU 11 performs the resume processing in response to the input interrupt signal, and the suspend status signal sent from the CPU 11 does not change to the level (high impedance state) or the "L" level The power supply controller 13 determines that an error has occurred and immediately stops supplying power to the system 10 or requests the CPU 11 to resume processing, and after the resuming processing is completed, the power supply controller 13 resumes processing. Error processing such as stopping supply of power supply voltage to Industrial applicability

As described above in detail, according to the present invention, in an electronic device to which a CP having a power management function is applied, a switching circuit including an element such as an FET and a power supply for detecting a setting of a suspend mode are provided. The controller makes it possible to reliably execute the suspend mode and the boot mode processing and control the supply of the power supply voltage.

Further, conventionally, when the operating voltage is not supplied to the electronic device, that is, when the electronic device is in an off state, it is possible to prevent runaway of the CPU which occurs when the power supply device is detached from the personal computer main body. It is possible.

Therefore, the power supply control system according to the present invention is effective for power supply control of an electronic device or the like to which a CPU having a resume function and a power supply management function is applied.

Claims

The scope of the claims

1, in a power supply control system of a data processing device (10) having a main power supply device (15) and a sub power supply device (16), supply of an operating voltage to the data processing device (10); Or a power switch (13a) for instructing a stop of the supply, and the main power supply device responding to the operation of the power switch (13a).

(15) or a selection signal for selecting one of the sub power supply devices (16), and the operation of the power switch (13a) is performed by the data processing device (10). Control means that outputs an output stop signal when instructing the

(1 3) and

In response to the selection signal output from the control means (13), one of the voltages output from the main power supply (15) and the sub power supply (16) is selected and output. Selection means (146), and-

Storage means (11a) for storing data indicating whether or not the suspend mode has been set, and said storage means (11a) in response to an output stop signal output from said control means (13) Processing means (11) for determining whether or not the suspend mode is set, and outputting a switching signal in accordance with the setting of the suspend mode;

A switch for controlling on / off of the supply of power from the sub power supply (16) to the selection means (146) in response to the switching signal output from the processing means (11). Power supply control system comprising:

2. The main power supply (15) includes an AC adapter (151) detachable from the data processor (10), a battery (152) and the AC adapter (151) or the battery. Li (1 5 2) first converter means power control system according claim 1, wherein having (1 53) for transforming the output voltage of ₀

3. The control means (13) is a drive signal for instructing the first converter means (153) to turn on and off in response to a switching signal output from the processing means (11). And output

3. The power supply control system according to claim 2, wherein said first converter means (153) is ONZ0FF controlled in response to said drive signal output from said control means (13).

4. The processing means (11) outputs a voltage from the selection means (146) so as to hold predetermined data when supply of the operating voltage to the data processing device (10) is stopped. The power supply control system according to claim 3, which is the scope of the request to be supplied.

5. The sub power supply (16) is built in the data processor (10),

The power supply control system according to claim 4, wherein said selection means (146) includes second converter means (146a) for transforming an output voltage of said sub power supply device (16).