JP3190564B2 - Electronic equipment with battery power - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic devices PDA and P which can be added with a peripheral device such as a memory card or a modem driven by a primary or secondary battery.
The present invention relates to a portable information terminal such as C and PHS and an electronic device provided with a battery power source such as a portable game machine.

[0002]

2. Description of the Related Art FIG. 15 is a schematic configuration diagram of a conventional electronic device having a general power supply circuit provided with a battery voltage monitoring circuit. In FIG. 15, the voltage of the battery 1 is boosted by the booster circuit 2 to supply a stable drive voltage to the system main body 3 of the electronic device. Reference numeral 4 denotes a voltage monitoring circuit.
Indicates that the capacity of the battery 1 has decreased and the system
The voltage value immediately before the operation limit of the system is detected and the system 3
A warning is issued.

FIG. 16 is a flowchart of a battery check process when the electronic device shown in FIG.
When the power supply circuit is turned on in step 1, the system main body 3 is initialized in step S2. In step S3, the voltage monitoring circuit 4 detects the voltage of the battery 1, and in step S4, the detected voltage is compared with a predetermined reference. Compare with voltage.

If the detected voltage is equal to or higher than the reference voltage, the process proceeds to step S6 to wait for the start of the application. If the detected voltage is equal to or lower than the reference voltage, the process proceeds to step S5 and the warning level is determined. And performs a warning sign output process for generating a warning to the user.

[0005] These processes are performed by a voltage monitoring circuit 4 shown in FIG. 15, which detects a voltage immediately before a voltage which is a limit of operation when the system main body 3 of the electronic device is started, and outputs a detection signal a. In response to the detection signal a, the program of the system main body 3 is interrupted, and output processing of a battery warning sign such as display of a battery warning mark, display of a battery replacement message, or warning sound is performed.

FIG. 17 is a flow chart of a power supply state improvement process in the prior art shown in FIG. When the voltage monitoring circuit 4 of FIG. 15 detects the voltage value immediately before the operation limit of the system body 3 is reached, a warning sign of the battery is turned on in a step S7, and it is determined whether or not the battery replacement work is to be performed in a step S8. recognize.

If the battery is to be replaced, the power is turned off. If the battery is not to be replaced, the process proceeds to step S9, and it is determined whether or not switching to an external power source is performed. And
When the switching to the external power source is performed, the battery warning sign is turned off, that is, until the battery is replaced in steps S8 and S9 or the power supply from an external power supply device such as an AC adapter is started. Display the sign.

FIG. 18 is a processing flow at the time of power supply state recovery in the prior art shown in FIG. In FIG. 18, when the battery is replaced in step S10, the power is once turned off, the battery is replaced with a new battery, and the power is turned on again.
The manual is released by replacing the battery, and the system body 3 is initialized again. When switching to the external power supply is performed in step S11, the input from the external power supply terminal is detected, and the warning sign of the battery is turned off when the recovery of the voltage by the external power supply is detected.

[0009]

As in the conventional power supply circuit described above, a voltage monitoring circuit detects whether or not the terminal voltage is higher than a predetermined reference voltage simply by measuring the terminal voltage of the battery. In the battery warning, the information on the state of the battery cannot be obtained unless the voltage of the battery falls below the warning level of the set system.In other words, the terminal voltage of the battery is reduced to the reference level. Even if the battery power has reached, there is a problem that it is not possible to obtain information as to how much load the remaining capacity of the battery can withstand.

Further, in the above-mentioned conventional device, when the battery voltage drops and becomes lower than a preset warning level, a peripheral device is accessed to perform a heavy-load operation or to perform a fundamental operation. Operation may not be regulated until the condition is improved, so the system itself malfunctions,
There has been a problem that data being created may be lost.

Further, when the state of the power supply is improved by replacing the battery or connecting to an AC adapter, there is a problem that special operations such as initialization and restart of the system main body in the electronic device must be performed. Was.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, an electronic apparatus having a battery power supply according to the present invention detects power supply means composed of a primary or secondary battery and detects an output voltage of the power supply means. A voltage monitoring means, and a load of the electronic device main body or a peripheral device connected to the electronic device main body by detecting that the output voltage of the power supply means detected by the voltage monitoring means becomes equal to or lower than a predetermined reference voltage. Control means for controlling the operation of
If the dummy load means provided in the upper Symbol power supply means, switching means for selectively actuating the pseudo load means, the output voltage of the power supply unit detected by said voltage monitoring means during operation of the dummy load unit based, in an electronic device comprising providing a load information detecting means for obtaining load information which can be connected to said power supply means at the time of power-on of the electronic device, the
Simulate the dummy load means with multiple dummy loads of different sizes.
The above pseudo loads are selected in order from the largest load.
Providing switching means connected to the power supply means,
At the timing when each dummy load is connected to the power supply,
The output voltage of the power supply means is detected by the voltage monitoring means.
A power supply for each pseudo load detected by the voltage monitoring means.
Means for detecting load information based on the output voltage of
To select the load that can be connected to the power source used.
Characterized in that the so that.

[0013]

[0014]

[0015]

Therefore, according to the present invention, when a load is connected to the power supply means composed of a primary or secondary battery, prior to the connection of the load, a plurality of pseudo loads are selectively selected in order from a large pseudo load by the switching means. Connect to the power supply means. Then , each output voltage of the power supply means in a state where each pseudo load is sequentially connected to the power supply means is detected by the voltage monitoring means, and each output voltage is compared with a predetermined reference voltage,
The load information detection means obtains load information connectable to the power supply means when the electronic device is powered on.

In this case, the reference voltage is set in advance to a minimum value required for a plurality of loads connected to the power supply to operate normally when the electronic device is powered on. Therefore, by using a plurality of pseudo loads, the load that can be connected can be determined with higher accuracy, and when each of the plurality of loads is connected from the load information detection unit prior to the connection of the plurality of loads, a normal It is possible to detect whether or not the battery has enough remaining capacity to be operated.

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

Further, in the electronic device provided with the battery power supply of the present invention, in the above configuration, based on the load information from the load information detecting means, the control means controls the load of the electronic device main body or the peripheral device from the power supply means. After the voltage supplied to the load is interrupted, the voltage monitoring means monitors the voltage of the power supply means in a state where the pseudo load is connected, confirms the voltage return, and confirms the voltage to the load at which the voltage return is confirmed. The supply is automatically restored.

Therefore, with the pseudo load means connected to the power supply means, the output voltage of the power supply means is detected by the voltage monitoring means, and this value is compared with a preset reference voltage.
The load information detecting means determines whether connection of the load is impossible. When it is determined that the connection of the load is impossible, the control means cuts off the voltage supplied to the load of the electronic device main body or the peripheral device from the power supply means, so that these loads are not connected to the power supply means. .

When the battery constituting the power supply is replaced or charged, or when the voltage of the power supply is restored by connecting to an external power supply via an adapter, the voltage monitoring means detects this. Then, when the load information detecting means determines that the power supply means can be connected to the load,
The power supply unit is connected to the load that can be connected by the control unit, and the supply of voltage to the electronic device main body or the peripheral device that has become connectable is automatically started.

[0027]

Embodiments of the present invention will be described below. FIG. 1 is a schematic configuration diagram of the present invention,
1 is a battery, 2 is a booster circuit, 3 is a system main body, 4 is a voltage monitoring circuit, and 8 is a dummy load circuit. The voltage of the battery 1 is boosted by the booster circuit 2 and supplied to the system main body 3 of the electronic device as a stable drive voltage. The voltage of the battery 1 is constantly monitored by the voltage monitoring circuit 4. When the capacity of the battery 1 decreases and reaches a predetermined reference voltage, that is, a voltage corresponding to the operation limit of the system main body 3 of the electronic device, Upon detecting this, a detection signal a indicating that the capacity of the battery 1 has been reduced is output to the system body 3.

The dummy load circuit 8 is for connecting a dummy load to the battery 1 in response to a control signal d from the system main body 3, and for connecting peripheral devices such as a memory card and a printer.
It is provided assuming a load to be operated from now on, such as starting an application. Then, the terminal voltage of the battery 1 in a state where the dummy load of the dummy load circuit 8 is connected to the battery 1 is monitored by the voltage monitoring circuit 4 in accordance with the control signal d from the system main body 3. If the terminal voltage is higher than a predetermined reference voltage, it is determined that a load corresponding to the pseudo load can be connected.

That is, as the current (load) flowing through the circuit increases, the terminal voltage of the battery 1 decreases accordingly.
At the time of starting the electronic device, a dummy load is provided assuming that the load of the electronic device is the largest, and a voltage drop caused by flowing a current through the dummy load is detected by the voltage monitoring circuit 4, and the load can be connected. Whether or not there is is detected in advance.

By doing so, a so-called passive detection system in which information on the state of the battery cannot be obtained unless the voltage of the battery falls below the warning level of the connected load, as in the conventional device, is used. With regard to the state of the battery, active information as to how much load the battery can withstand can be obtained before connecting the load.

FIG. 2 is a block diagram of one embodiment showing a specific configuration of the pseudo load circuit 8 described above, assuming the maximum load of the system main body 3 connected to the battery 1. 8-1 is a switching element such as an FET;
Reference numeral -2 denotes a load resistance serving as a pseudo load. When a control signal d from the system main body 3 is supplied to the gate G of the switching element 8-1, the voltage between the source S and the drain D of the switching element 8-1 changes. The conduction and the load resistance 8-2 are connected to both ends of the battery 1 of FIG. 1 as a pseudo load.

Therefore, if the value of the load resistor 8-2 is made to correspond to the value of the maximum load to be connected to the battery 1, the battery 1 can be connected to any load as a peripheral device or application. However, it can be detected in advance whether or not these loads can be tolerated.

FIG. 3 is a block diagram of one embodiment in which the value of the pseudo load resistance of the pseudo load circuit 8 can be changed. Switching element 8 composed of FET, etc.
1a, 8-1b, and 8-1c and load resistors 8-2a, 8-2b, and 8-2c, which are pseudo loads, are connected in series with each other and connected to the battery 1 of FIG. I do.

Each of the switching elements 8-1a, 8-1
The control signal d composed of clock pulses from the system main unit 3 as shown in FIG. 4 is counted by the binary counter 8-3 at the gates G of b and 8-1c.
Each control signal shown as a control signal of 1a, a control signal of 8-1b, and a control signal of 8-1c is created, and this control signal is supplied.

Therefore, each of the switching elements 8-1a, 8-1
-1b and 8-1c are successively turned on as shown in FIG. The load resistors 8-2a, 8-2b, 8-2
Since c is set to the same resistance value R, the resistance value of the dummy load becomes R, R / 2, and R / R by turning on the switching elements 8-1a, 8-1b, and 8-1c sequentially. 3
Are switched to three stages.

By changing the value of the dummy load in this way, the terminal voltage of the battery 1 corresponding to each dummy load is read by the voltage monitoring circuit 4, and the maximum load that can be driven by the battery being used is determined based on the value. It can be determined in advance. In this case, the information obtained by the plurality of pseudo loads can be used as information corresponding to the plurality of loads to be connected, and the information in the system main body 3 is calculated using the information obtained from each of the pseudo loads. The circuit may provide more accurate information for a particular load to be connected.

In this embodiment, the resistance values of the three load resistors 8-2a, 8-2b, and 8-2c serving as pseudo loads are set to the same value, but may be set to different values. .

FIG. 5 is a block diagram of another embodiment in which the value of the pseudo load resistance of the pseudo load circuit 8 can be changed. The difference from the embodiment shown in FIG. 3 is that the switching elements 8-1a, 8-1b,
8-1c are selectively turned on sequentially as shown in FIG.

That is, two control signals d1 and d2 as shown in FIG. 6 are extracted from the system body 3 and supplied to the decoder 8-4. The decoder 8-4 receives the control signals d1 and d2, and receives the control signals 8-1a and 8-1 in FIG.
A control signal as shown as a control signal of b and a control signal of 8-1c is derived, and this control signal is supplied to the gate G of the corresponding switching element 8-1a, 8-1b, 8-1c.

Accordingly, the dummy load of the dummy load circuit 8 is one in which the load resistors 8-2a, 8-2b, and 8-2c are selectively switched sequentially. In this case, the values of the respective load resistors are set to different values as appropriate, for example, such that the load resistor 8-2a has a minimum value, the load resistor 8-2b has an intermediate value, and the load resistor 8-2c has a maximum value. Then, by switching the respective load resistors, the maximum load that can be driven by the battery 1 in use can be determined in the same manner as in the embodiment shown in FIG.

In the embodiment shown in FIGS. 3 and 5 described above, the resistance value of the dummy load is switched in three stages, and the terminal voltage of the battery in each case is monitored by the voltage monitoring circuit 4 and can be driven by the used battery. The maximum load is determined, but the switching of the pseudo load is not limited to three stages.
When a load to be connected to the battery 1 is predetermined, a plurality of pseudo loads corresponding to the connected load may be provided.

In the embodiments shown in FIGS. 2, 3 and 5, the switching elements 8-1a, 8-1b and 8-1c are connected to the FE.
Although a device using T is shown, a switching device other than an FET can be used as long as a current of several tens of mA can flow.

FIG. 7 is a block diagram of an electronic device incorporating the dummy load circuit 8 shown in FIG. 2, FIG. 3 or FIG.
2, 3, and 5 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 7, reference numeral 5 denotes a charging prevention circuit provided in series with the battery 1, reference numeral 6 denotes a protection circuit, reference numeral 7 denotes an external power input terminal, and the system main body 3 has the following configuration. ing. 3-1 of the system body 3 is a CPU,
-2 is a system gate array, 3-3 is an RTC, 3-4
Is a PCMCIA controller, 3-5 is a PCMCIA card slot, 3-6 is a display device, 3-7 is a ROM,
-8 is a RAM.

3-9 is a flash memory, 3-10 is S
10 interfaces, 3-11 are tablets, 3-1
2 is an input key, 3-13 is an IR interface, b is a 5V output of the booster circuit 2, and C is 3 of the booster circuit 2.
V-system output. Since such a system main body 3 has a generally widely used configuration, a detailed description thereof will be omitted.

Next, FIG. 8 shows a case where a voltage drop when a current flows through the dummy load circuit 8 shown in FIGS. 2, 3 and 5 becomes equal to or lower than a voltage value level of an operation limit of the system main body 3. This is an embodiment in which connection to a device cannot be performed, and portions corresponding to FIGS. 2, 3, and 5 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 8, reference numeral 10 denotes a peripheral device interface (I / F) for connecting to peripheral devices.
Is a switching element for selectively shutting off the power supply to the peripheral device interface 10, and a control signal f for controlling the power supply of the peripheral device from the system main body 3 is provided at a gate terminal of the switching element 9. Supplied. e is a signal such as an address signal and a data signal supplied from the system main body 3 to the peripheral device interface 10.

Therefore, when a current flows from the battery 1 to the dummy load circuit 8, the voltage drop by the dummy load circuit 8 is monitored by the voltage monitoring circuit 4, and when the value is higher than the operating limit voltage level of the system body 3, Indicates that the switching element 9 is turned on by the control signal f and the peripheral device interface 1
0 is supplied with a predetermined voltage from the booster circuit 2. And
A peripheral device (not shown) to a peripheral device interface 1
When connected to 0, the signal e is supplied to the peripheral device.

When the voltage monitored by the voltage monitoring circuit 4 becomes lower than the operating limit voltage level of the system main unit 3, the control signal f is inverted and the switching element 9 is turned off. Therefore, the power supply to the peripheral device interface 10 is cut off, and the connection between the peripheral device interface 10 and the peripheral device (not shown) connected thereto is cut off.

FIG. 9 shows a case where a voltage drop when a current flows through the dummy load circuit 8 shown in FIGS. This is another embodiment in which connection cannot be made, and is different from the embodiment shown in FIG. 8 in that it can support two peripheral devices having different loads.

In the figure, reference numeral 11 denotes a first peripheral device interface for connecting a lightly loaded first peripheral device (not shown), and reference numeral 12 denotes a second peripheral device (not shown) having a large load. ) Is a second peripheral device interface for connecting the device. Reference numerals 9-1 and 9-2 denote switching elements that selectively supply the output of the booster circuit 2 to the peripheral device interfaces 11 and 12.

[0052] The switching element 9-1, the control signal intended to selectively rendered conductive by f _1, under the condition that light load to the peripheral device interface 11 is connected, the voltage level of the battery 1 is a predetermined value This is detected by using the dummy load 8, and conduction is performed by the detection signal.

The switching element 9-2 is selectively turned on by the control signal f _2. Under the condition that a heavy load is connected to the peripheral device interface 12, the voltage level of the battery 1 becomes It is detected using a pseudo load that the value is equal to or greater than a predetermined value, and conduction is performed by the detection signal.

As described above, according to the present embodiment, the pseudo load is weighted, and a plurality of peripheral device interfaces are regulated stepwise according to the weight of the load according to the state of the power supply, that is, the load that the power supply can withstand. It is something to do.

Next, the operation at the time of startup in the embodiment shown in FIGS. 8 and 9 will be described based on the processing flow shown in FIG. In FIG. 10, steps S1 to S5 are the same as in the conventional case described with reference to FIG. When the power of the electronic device is turned on in step S1, a conventional battery voltage check is first performed in step S2.

At this time, if the battery voltage is equal to or lower than the warning level, a warning sign is turned on in step S5, and a process for restricting access to peripheral devices is performed in step S17 without checking by a pseudo load.

In step S4, if the voltage level of the battery 1 detected by the voltage monitoring circuit 4 is higher than the predetermined reference level and is not at the warning level, step S1
5, the dummy load circuit 8 is controlled by the control signal d from the system main body 3.
, A pseudo load is applied to the power supply of the battery 1, and the voltage monitoring circuit 4 detects a voltage drop of the pseudo load circuit 8.

Then, the detected voltage is applied to step S
16, if it is detected reference voltage less whether a reference voltage below preset, the process proceeds to step S17, the control signal f, f _1, f ₂ by the switching element 9,
By turning off 9-1 and 9-2, the access to the peripheral device interfaces 10, 11, and 12 is restricted.

If it is determined in step S16 that the detected voltage is equal to or higher than the reference voltage, or if the process of restricting access to the peripheral device interface in step S17 is cancelled, the flow advances to step S18 to start the application. wait.

Therefore, based on the information obtained using the pseudo load circuit, if the battery cannot afford to drive the peripheral device,
It is possible to restrict the use of peripheral devices, regulate the operation with a large load, and perform program processing to guarantee the operation of the main unit function. Even if the warning level is lower than the set warning level, the peripheral device can be accessed to prevent an accident such as performing a heavy load operation and causing malfunction.

Next, the operation when the power supply condition is improved will be described with reference to FIGS. 11, 12 and 13. FIG. The dummy load circuit 8 shown in FIGS. 8 and 9 controls the control signal d from the system body 3.
, The pseudo load enters the circuit. When the pseudo load is turned on, the voltage of the battery 1 drops, and once the voltage drops below the regulation level voltage V ₀ shown in FIG. 12, the control signal f is set so that the switching elements 9, 9-1 and 9-2 are always turned off. , F ₁ , f ₂ are supplied from the system main body 3 to turn off the switching elements 9, 9-1, 9-2 and cut off the power supply to the peripheral device interfaces 10, 11, 12. If a user tries to use a peripheral device (not shown) in this state, a message as shown in FIG. 13 is displayed.

Step S20 in FIG. 11 shows the above state. When access to such peripheral devices is restricted, as a means for restoring the power supply voltage, there is a method of replacing the battery with a new battery or supplying power from an external power supply such as an AC adapter. However, it is necessary to continue restricting access to peripheral devices until the operation is performed.

From the state of step S20 in which access to the peripheral device is restricted, the process proceeds to step S21, and when the battery 1 is replaced, the power is once turned off. Perform normal operation. Without replacement of the battery 1, the AC adapter or the like in step S22, when connected to an external power source, the voltage of the power source is the release level voltages V ₁ or more shown in FIG. 12, the detected proceeds to step S23 so, It is determined whether the sign for battery replacement is lit.

If the battery replacement sign is lit,
Off this at step S24, the control signal f, inverts the f _1, f ₂ at step S25, the switching element 9, 9
-1 and 9-2 are turned on, and a voltage is supplied to the peripheral device interface to limit the connection of the peripheral device. When the access to the peripheral device is restricted as described above, the program processing is performed so as to continue the regulation of the operation until the fundamental state of the power supply voltage is improved. A load such as a peripheral device can be connected before the complete recovery to prevent an accident such as a malfunction and loss of data being created.

Next, the operation at the time of return from the power supply state will be described with reference to FIGS. When the voltage by use of an external power supply is restored to the release level voltages V ₁ shown in FIG. 12, the control signal f, the switching elements by f _1, f ₂ 9,9-1,9
Since the restriction of -2 is eliminated, the switching elements 9, 9-1 and 9-2 can be turned on as necessary. Therefore, when using the peripheral device, the switching elements 9, 9-1, 9-2 are turned on at this time to initialize the peripheral device interfaces 10, 11, 12.

In step S22 of FIG. 14, when an external power supply is detected by connection of the external power supply, step S26 is performed.
In the voltage detecting whether restored to release level voltage V ₁ of the Figure 12. When it is detected that has recovered to the release level voltage V _1, warning signs of battery replacement, it is determined whether lit at step S27, when it is lit,
In step S28, the warning sign is turned off, and in step S2
9 and the control signals f, f ₁ , f ₂ from the system body 3
To turn on the switching elements 9, 9-1, 9-2 to supply power to the peripheral device interfaces 10, 11, 12.

The peripheral device interface 1
The restrictions on the access to 0, 11, and 12 are released, and in step S30, the peripheral device interfaces 10, 11, and 12 are released.
Is initialized. Therefore, when the battery voltage of the electronic device drops and access to peripheral devices is restricted, when replacing a new battery, the device is turned off and restarted after battery replacement is completed. It is not necessary to release the access restriction, but when using an external power supply such as an AC adapter, perform a special operation such as initializing or restarting the device when the power supply voltage is detected to be restored. Without this, the restriction on access to peripheral devices is automatically released.

[0068]

As described above, according to the present invention, when a load is connected to an electronic device using a battery, a dummy load is connected to check the remaining capacity of the battery before connecting the load. With a relatively simple configuration that only requires a load, it is possible to accurately obtain in advance the battery information as to whether or not the battery is in a state that can withstand the load connection. Accidents, such as loss of load data, can be prevented beforehand. In addition, since the remaining capacity of the battery is checked by using a plurality of the pseudo loads, it is possible to obtain the information of the battery as to whether or not the load can be connected with higher accuracy.

When a peripheral device which becomes a heavy load is connected via the peripheral device interface, information on the remaining capacity of the battery is obtained using a pseudo load prior to the connection, and the peripheral device is obtained from this information. Because the connection of the battery is limited, only the basic system of the main unit is used to extend the battery usage time, or depending on the load of peripheral devices,
The connection can be automatically made.
In addition, by using a plurality of pseudo loads in this case,
Peripheral device connection can be controlled with high precision, and a plurality of peripheral devices can be selectively connected.

Further, the function limited by the shortage of the remaining capacity of the battery is automatically canceled without performing any special operation after the power supply is restored, and all the functions can be used. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a basic configuration of the present invention.

FIG. 2 is a configuration diagram of a first embodiment of a pseudo load circuit used in the present invention.

FIG. 3 is a configuration diagram of a second embodiment of the pseudo load circuit used in the present invention.

FIG. 4 is a diagram illustrating an operation when the pseudo load circuit shown in FIG. 3 is used.

FIG. 5 is a configuration diagram of a third embodiment of a pseudo load circuit used in the present invention.

6 is a diagram illustrating an operation when the pseudo load circuit shown in FIG. 5 is used.

FIG. 7 is a block diagram of the first embodiment of the present invention.

FIG. 8 is a block diagram of a second embodiment of the present invention.

FIG. 9 is a block diagram of a third embodiment of the present invention.

FIG. 10 is a flowchart for explaining an operation at the time of startup of the present invention.

FIG. 11 is a flowchart illustrating an operation at the time of power supply recovery according to the present invention.

FIG. 12 is a diagram illustrating the operation of the present invention.

FIG. 13 is a display example during operation of the present invention.

FIG. 14 is a flowchart for explaining an operation in another embodiment when the power supply state is restored according to the present invention.

FIG. 15 is a block diagram of a basic configuration of a conventional example.

FIG. 16 is a flowchart for explaining an operation at the time of startup in a conventional example.

FIG. 17 is a flowchart showing a process at the time of improving a power supply state in a conventional example.

FIG. 18 is a flowchart showing a process at the time of power supply state recovery in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Booster circuit 3 System main body 4 Voltage monitoring circuit 8 Pseudo load circuit 8-1 Switching element 8-2 Load resistance 8-1a Switching element 8-1b Switching element 8-1c Switching element 8-2a Load resistance 8-2b Load Resistance 8-2c Load resistance 8-3 Counter 8-4 Decoder 9 Switching element 9-1 Switching element 9-2 Switching element 10 Peripheral device interface 11 PCMCIA card interface 12 Serial interface

Claims (2)

(57) [Claims] 1. Power supply means comprising a primary or secondary battery;
Voltage monitoring means for detecting an output voltage of the power supply means, and detecting whether the output voltage of the power supply means detected by the voltage monitoring means becomes equal to or less than a predetermined reference voltage, and detecting the output voltage of the power supply means. and control means for controlling the operation of the load, such as a peripheral device connected to a dummy load means provided in the upper Symbol power supply means, switching means for selectively actuating the pseudo load means, operation of the dummy load unit the voltage based on the output voltage of the power supply unit detected by the monitoring means, and by providing a load information detecting means for obtaining load information which can be connected to said power supply means at the time of power-on of the electronic device at the time of
In the electronic device, the pseudo load means may include a plurality of pseudo negative loads of different sizes.
Load, and select each of the above pseudo loads in order from the largest load
Switching means connected to the power supply means,
Timing when each of the above pseudo loads is connected to power supply means
The output voltage of the power supply means is detected by the voltage monitoring means.
Then, the power to each pseudo load detected by the voltage monitoring means is
The load information detecting means based on the output voltage of the power source means.
To select the load that can be connected to the power source used.
Electronic apparatus having a battery power source, characterized in that the so that. 2. After the voltage supplied from the power supply unit to the load of the electronic device main body or the peripheral device is cut off by the control unit based on the load information from the load information detection unit, the voltage monitoring unit outputs the voltage. voltage monitor in a state of connecting the dummy load power means, to check the voltage return, claim 1, characterized in that so as to return the voltage supply to the loads with voltage returning confirmed automatically An electronic device comprising the battery power supply according to the above .