JP2010015310A - Electronic apparatus, power supply control method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more effectively practically use power in consideration of a residual amount of each of a plurality of batteries. <P>SOLUTION: This electronic apparatus has: the plurality of batteries 10A, 10B each of which is a power supply; a load circuit 30 operated by power supplied by one of the batteries 10A, 10B; switches SW1, SW2 switching supply routes of the power to the load circuit 30 from the batteries 10A, 10B; voltage residual amount detection circuits 11A, 11B detecting residual amounts of the batteries 10A, 10B; and a control circuit 40 calculating a unit supply time of each battery supplying the power to the load circuit 30 according to each residual amount of the batteries 10A, 10B detected by the voltage residual amount detection circuits 11A, 11B, circularly switching the switches SW1, SW2 according to a calculation result thereof, and supplying the power to the load circuit 30 from one of the batteries 10A, 10B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic device using a plurality of batteries, a power supply control method, and a program.

Conventionally, with the aim of eliminating all the inefficiencies and inefficiencies in which the discharge time is undesirably shortened by controlling all of the capacities of each of the plurality of battery packs to be efficiently discharged. A technique has been conceived in which two battery packs are controlled to be discharged and stopped alternately at predetermined time intervals and repeated several times, at least twice. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 11-252812

  The technique described in Patent Document 1 is considered to be effective when a plurality of batteries originally have the same capacity and the same remaining amount. On the other hand, when using a plurality of batteries having significantly different original capacities, or using a plurality of batteries having different remaining capacity, it is not possible to cope with this by performing the control as described above. Although the remaining amount of the battery is still sufficient, there is a possibility that the other battery is completely discharged, and as a result, a plurality of batteries cannot be effectively used.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an electronic device and a power supply control that can more effectively use power in consideration of the remaining amount of each of a plurality of batteries. It is to provide a method and a program.

  According to the first aspect of the present invention, a plurality of batteries serving as a power source, a load operated by power supplied from one of the plurality of batteries, and switching for switching power supply paths from the plurality of batteries to the load Means for detecting the remaining amount of each of the plurality of batteries, and a unit supply time for each battery for supplying power to the load according to each remaining amount of the plurality of batteries detected by the detecting unit. And a control unit that cyclically switches the switching unit according to the calculation result and supplies power to the load from one of the plurality of batteries.

  According to a second aspect of the present invention, the first aspect of the invention further includes a power storage unit that temporarily stores electric power supplied via the switching unit between the switching unit and the load. The control means calculates a conduction time by the switching means during a unit supply time for each battery that supplies power to the load according to the time characteristic of the power storage means.

  According to a third aspect of the present invention, in the first aspect of the invention, the detection means includes a voltage detection means for detecting a terminal voltage of each of the plurality of batteries, and a temperature detection for detecting the temperature of each of the plurality of batteries. And a table storage means for storing a table in which the temperature, terminal voltage value and remaining amount are associated with each of the plurality of batteries, the terminal voltage detected by the voltage detection means, and the temperature The remaining amount of each of the plurality of batteries is acquired by referring to the table of the table storage unit based on the temperature detected by the detection unit.

  According to a fourth aspect of the present invention, in the first aspect of the invention, each of the batteries according to the detection of the remaining amount of each of the plurality of batteries by the detection unit and the remaining amount of the plurality of batteries by the control unit. The calculation of the unit supply time for each unit is periodically executed.

  According to a fifth aspect of the present invention, in the first aspect of the invention, the detection means replaces the discharge capacity of each of the plurality of batteries stored in the discharge capacity storage means with the remaining amount of each of the plurality of batteries. Each of the plurality of detected batteries is updated and stored as needed, and the control means supplies power to the load according to the discharge capacity of the plurality of batteries stored by the detection means. A unit supply time for each battery is calculated, the switching means is cyclically switched according to the calculation result, and power is supplied from one of the plurality of batteries to the load.

  According to a sixth aspect of the present invention, in the first aspect of the invention, the detection means includes a voltage detection means for detecting a terminal voltage of each of the plurality of batteries, and a temperature detection for detecting a temperature of each of the plurality of batteries. And a table storage means for storing a table in which the temperature and the terminal voltage value and the discharge capacity are associated with each of the plurality of batteries, instead of the remaining amount of each of the plurality of batteries, Based on the terminal voltage detected by the voltage detection means and the temperature detected by the temperature detection means, the discharge capacity of each of the plurality of batteries is acquired by referring to the table of the table storage means, and the control means is the detection means. The unit supply time for each battery that supplies power to the load is calculated according to the detected discharge capacity of the plurality of batteries, and the switch is calculated according to the calculation result. Switching the grayed means cyclically, characterized in that to supply power to one because the load of the plurality of batteries.

  The invention according to claim 7 is a switch for switching a power supply path from the plurality of batteries to the load, a plurality of batteries serving as a power source, a load that operates by power supplied from at least one of the plurality of batteries. A method for controlling power in an electronic device including a circuit, comprising: a detection step of detecting a remaining amount of each of the plurality of batteries; and a load according to each remaining amount of the plurality of batteries detected in the detection step. A control step of calculating a unit supply time for each battery for supplying power, cyclically switching the switch circuit according to the calculation result, and supplying power to the load from one of the plurality of batteries. It is characterized by that.

According to an eighth aspect of the present invention, there are provided a plurality of batteries serving as a power source, a load operated by power supplied from at least one of the plurality of batteries, and a switch for switching power supply paths from the plurality of batteries to the load. A program executed by a computer built in an electronic device including a circuit, and detecting a remaining amount of each of the plurality of batteries;
A unit supply time for each battery that supplies power to the load is calculated according to each remaining amount of the plurality of batteries detected in the detection step, and the switch circuit is cyclically switched according to the calculation result, And a control step of supplying power to the load from one of the batteries.

  According to the present invention, it is possible to more effectively use electric power in consideration of the remaining amount of each of a plurality of batteries.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
In the present embodiment, the configuration and operation of the electronic device 1 having two batteries will be described as an example.

  FIG. 1 is a block diagram showing a schematic configuration by extracting a control system and a power supply system of the electronic apparatus 1 according to the embodiment. In the figure, a battery selection switching circuit 10 includes two batteries 10A and 10B, switches SW1 and SW2, and capacitors C1 and C2.

  The electric power supplied from the battery 10A is supplied to the voltage matching circuit 20 via the switch SW1, and the electric power supplied from the battery 10B is supplied to the voltage matching circuit 20 via the switch SW2. The voltage matching circuit 20 is composed of, for example, a step-down DC-DC converter, and supplies the supplied power to the load circuit 30 after stabilizing and constanting the applied power.

  The switches SW1 and SW2 of the battery selection switching circuit 10 are controlled to be opened and closed by an on / off control signal from the control circuit 40, and one of the power is supplied to the load circuit 30 via the voltage matching circuit 20. Is done.

  The control circuit 40 inputs voltage information and remaining amount information from the batteries 10A and 10B.

  The capacitors C1 and C2 in the battery selection switching circuit 10 are for the purpose of averaging the output currents of the batteries 10A and 10B with respect to the current consumed intermittently from the batteries 10A and 10B via the switches SW1 and SW2. Inserted.

Next, specific configurations of the battery selection switching circuit 10 and the voltage matching circuit 20 of the electronic apparatus 1 will be described with reference to FIG.
Each of the switches SW1 and SW2A is configured by connecting two p-channel FETs and two protection diodes in series.
Taking the switch SW1 as an example, the voltage V1 from the battery 10A is applied to the drain of the p-channel first FET1. The anode of the protection diode D1 is connected to the drain of the FET1, and the cathode of the protection diode D1 is connected to the source of the FET1. An ON / OFF signal O / O1 from the control circuit 40 is given to the gate of the FET1.

  The source of the p-channel second FET 2 is connected to the source of the FET 1 and to the cathode of the protection diode D2. The drain of the FET 2 is connected to the anode of the protection diode D 2, the cathode of the diode D 3 of the voltage matching circuit 20, and one end of the inductor L. An ON / OFF signal O / O2 from the control circuit 40 is given to the gate of the FET2.

  Further, the remaining voltage detection circuits 11A and 11B are connected to the batteries 10A and 10B, respectively. These voltage remaining amount detection circuits 11A and 11B are generally widespread as general-purpose ICs having a function of detecting the voltage and remaining amount of the battery, and are very well-known techniques. Although the configuration and operation are omitted, both the voltage information and the remaining amount information detected as described above are sent to the control circuit 40.

  As described above, the voltage matching circuit 20 is a step-down DC-DC converter, and includes a diode D3, an inductor L, and a capacitor C3. The voltage of one of the batteries 10A and 10B sent via the switches SW1 and SW2 is applied to the cathode of the diode D3 whose anode is grounded and one end of the inductor L. The other end of the inductor L is connected to a capacitor C3 having one end grounded and connected to the load circuit 30. The control circuit 40 detects the voltage V 0 at the connection point position with the load circuit 30.

  The control circuit 40 is composed of a CPU incorporating an RTC (Real Time Clock), a main memory composed of DRAM, and a nonvolatile memory, and is composed of a program memory storing an operation program, fixed data, etc. The operation program and fixed data read from the program memory are developed on the main memory and executed, thereby controlling the operation in the electronic device 1.

Next, the operation of the above embodiment will be described.
Here, it is assumed that the power consumption of the load circuit 30 can be grasped by prior evaluation and stored in the program memory in the control circuit 30 as fixed data.

  Further, in the following operation example, the forward bias voltage VF of the diodes D1 and D2 and the ON voltage of the switches SW1 and SW2 are in an ideal state, that is, 0 [V], for the sake of simplicity. Shall.

First, the basic operation in this embodiment will be described.
When the switch SW1 is first turned on when the power is turned on, a current flows from the battery 10A to the load circuit 30 via the switch SW1 and the inductor L of the voltage matching circuit 20. At this time, energy corresponding to the current value is stored in the inductor L. Next, when the switch SW1 is turned off, the current from the battery 10A does not flow, but instead, the energy stored in the inductor L is released through the diode D3, and the current flows and is stored in the load circuit 30. When all the energy has been flown, the current value in the inductor L returns to the initial value “0 (zero)”.

  Next, when the switch SW2 is turned on, a current flows from the battery 10B to the load circuit 30 via the switch SW2 and the inductor L of the voltage matching circuit 20. At this time, energy corresponding to the current value is stored in the inductor L. Next, when the switch SW2 is turned off, the current from the battery 10B does not flow, but instead, the energy stored in the inductor L is released through the diode D3, and the current flows and is stored in the load circuit 30. When all the energy has been flown, the current value in the inductor L returns to the initial value “0 (zero)”.

  With this cycle as one period, ON / OFF of the switch SW1 and ON / OFF of the switch SW2 are sequentially repeated.

  T1 is the period in which the switch SW1 is turned on, t2 is the period in which the switch SW2 is turned on, t2 is the period in which the switch SW1 is turned on after the switch SW1 is turned on, and the switch SW2 FIGS. 3 and 4 show waveforms of the current flowing through the inductor L and the currents flowing through the switches SW1 and SW2, when T2 is a period from when the switch is turned on to when the switch SW1 is turned on in the next cycle.

  3 shows a discontinuous mode in which the current flowing through the load circuit 30 is temporarily interrupted, and FIG. 4 shows a continuous mode in which a current flows continuously through the load circuit 30. In both figures, (A) shows the current flowing through the inductor L, (B) shows each waveform of the current flowing through the switches SW1 and SW2.

  The amount of energy released from each of the batteries 10A and 10B is obtained by multiplying the value of the current that flows while the corresponding switch is turned on by the voltage of the battery, and the average power is the period tn ( In this case, since the ratio of n: 1, 2) to the period Tn is multiplied, the consumption of each battery 10A, 10B is controlled by controlling the ratio of the on-periods t1, t2 in the period T. Control the power ratio by setting it arbitrarily.

  FIG. 5 shows the processing contents executed when the control circuit 40 supplies the power of the batteries 10A and 10B to the load circuit 30 via the voltage matching circuit 20 while the power source of the electronic device 1 is turned on. is there.

  When the power is turned on, the control circuit 40 first starts an operation of acquiring the remaining amount information of the batteries 10A and 10B of the battery selection switching circuit 10 by the voltage remaining amount detection circuits 11A and 11B, and thereafter continues the acquiring operation (step S101). ).

  Next, from the remaining amount of each battery 10A, 10B and the characteristics of the inductor L of the voltage matching circuit 20, the time t1, the cycle period T1, and the battery 10B are continuously supplied. The time t2 to be performed and the cycle period T2 are calculated (step S102).

here,
Battery 10A remaining amount / Battery 10B remaining amount
= Discharge capacity of battery 10A / Discharge capacity of battery 10B
= B
Assuming that the voltages of the batteries 10A and 10B are V1 and V2, the output voltage to the load is V0, and the inductor value = L, the relationship between the periods t1 and t2 is in the discontinuous mode.

As described above, assuming that the cycle periods of the switches SW1 and SW2 are T1 and T2, and the total period is T, the condition that the constant power is continuously supplied to the load circuit 30 is as follows.
T1 = (V1 / V0) * t1,
T2 = (V2 / V0) * t2,
T = T1 + T2
The control target value can be calculated as

  Specifically, for example, the power supply capabilities of the batteries 10A and 10B are both 50 [W / h], the required power to be supplied to the load circuit 30 is V0 = 5 [V] and continuously 10 [W], and the remaining battery 10A that is first used is remaining. A case will be described in which the amount is 80%, the voltage of the battery 10A is 15 [V], the remaining amount of the battery 10B is 100%, and the voltage of the battery 10B is 16 [V].

Remaining ratio = 80/100 = 0.8
This value 0.8 is taken as the discharge power ratio B.
When the value of the inductor L is 10 [μH] and t2 = 2.0 [μS],
t1≈1.859 [μS], and the current of the inductor L becomes continuous mode operation.
Base current Ia≈0.98 [A],
T1≈5.577 [μS],
T2≈6.4 [μS],
T≈11.974 [μS]
It becomes.

At this time,
Average discharge capacity W1 from battery 10A≈4.45 [W]
Average discharge capacity W2 from battery 10B≈5.55 [W]
The discharge capacity ratio W1 / W2 = 0.8.
The remaining amount of each battery 10A, 10B
Battery 10A: 50 [W / h] * 0.8 = 40 [W / h]
Battery 10B: 50 [W / h] * 1.0 = 50 [W / h]
Therefore, each discharge time is
Battery 10A: 40 [W / h] /4.45 [W] = about 9 [h]
Battery 10B: 50 [W / h] /5.55 [W] = about 9 [h]
Thus, both the batteries 10A and 10B can be discharged in a time equal to about 9 hours until the discharge is completed, and all the stored power can be used up.

  The control circuit 40 calculates the times t1 and t2 at which the respective electric powers of the batteries 10A and 10B are continuously supplied in step S102, and then sets an initial value “1” for a variable n designating the battery (step S102). In step S103, only the switch SW1 is turned on and the other switch SW2 is turned off according to the variable “1”, and the power from the battery 10A is supplied to the load circuit 30 via the voltage matching circuit 20 (step S104).

  At the same time, counting of the times t1 and T1 by the RTC built in the CPU of the control circuit 40 is started (step S105).

  Thereafter, it is continuously determined whether or not the remaining amount of the battery 10A is exhausted (step S106) and whether or not the time t1 has elapsed (step S107). Otherwise, the process returns to step S106 again. Wait until it becomes the state.

  When the time t1 elapses, it is determined in step S107, and at that time, the switch SW1 is turned off to stop the power supply by the battery 10A (step S108).

  In this case, in either the continuous mode or the discontinuous mode, power supply to the load circuit 30 is continued for a predetermined time by the inductor L as described above even after the power supply is stopped by the battery 10A.

  Thereafter, it is continuously determined whether or not the remaining amount of the battery 10A is exhausted (step S109) and whether or not the time T1 has elapsed (step S110). Otherwise, the process returns to step S109 again. , Wait for these states.

  When the time T1 elapses, it is determined in step S110, and the value of the variable n is updated by “+1” and set to “2” (step S111). Then, it is determined whether or not the value “2” of the new variable n that has been updated exceeds the total number N (here, “2”) of the battery (step S112). The process returns to step S104.

  Then, this time, only the switch SW2 is turned on and the other switch SW1 is turned off to supply the power from the battery 10B to the load circuit 30 via the voltage matching circuit 20 (step S104).

  At the same time, the counting of the times t2 and T2 by the RTC built in the CPU of the control circuit 40 is started (step S105).

  Thereafter, it is continuously determined whether or not the remaining amount of the battery 10B is exhausted (step S106) and whether or not the time t2 has elapsed (step S107). Otherwise, the process returns to step S106 again. Wait until it becomes the state.

  When the time t2 has elapsed, it is determined in step S107, and at that time, the switch SW2 is turned off to stop the power supply by the battery 10B (step S108).

  In this case, in either the continuous mode or the discontinuous mode, power supply to the load circuit 30 is continued for a predetermined time by the inductor L as described above even after the power supply is stopped by the battery 10B.

  Thereafter, it is continuously determined whether or not the remaining amount of the battery 10B is exhausted (step S109) and whether or not the time T2 has elapsed (step S110). Otherwise, the process returns to step S109 again. , Wait for these states.

  When the time T2 elapses, it is determined in step S110, and the value of the variable n is updated by “+1” and set to “3” (step S111). When it is determined that the value “3” of the newly updated variable n exceeds the total number N (here, “2”) of the battery (step S112), the time T has elapsed, and the battery 10A and the battery 10 Assuming that the power supply for one cycle by 10B has been completed, the processing returns to step S102 again.

  In this way, by repeatedly executing the processing from step S102 on every cycle T, power is supplied to the load circuit 30 via the voltage matching circuit 20 at a time ratio t1: t2 corresponding to the remaining amount and voltage of the batteries 10A and 10B. Both the batteries 10A and 10B can be almost completely discharged and the power can be used up to operate the load circuit 30.

  If it is determined in step S106 or step S109 that the remaining power of the battery 10A or the battery 10B being fed is exhausted, the processing content in FIG. 5 is terminated at that time, and the load circuit 30 by the batteries 10A and 10B is transferred. Stops the operation by power supply.

  As described above, according to the present embodiment, it is possible to more effectively utilize limited power in consideration of the remaining amount of each of the plurality of batteries 10A and 10B.

  In the above-described embodiment, the switches SW1 and SW2 are actually switched in the cycle periods T1 and T2 by providing, for example, an inductor L as a power storage means in the voltage matching circuit 20 that stabilizes the voltage applied to the load circuit 30. Since the on time t1 and t2 are sufficiently shorter than the cycle periods T1 and T2 in both the continuous mode and the discontinuous mode, the time for continuously discharging the batteries 10A and 10B at a time is greatly increased. By shortening to, the utilization rate of the batteries 10 </ b> A and 10 </ b> B can be further increased and the power can be effectively utilized.

  In the above embodiment, every time one period T ends, the process returns to step S102 to detect the remaining amount and the voltage of the batteries 10A and 10B each time, and the times t1 and t2 in the next period T according to the detected result. The cycle periods T1 and T2 are calculated.

  As described above, by periodically detecting the state of the batteries 10A and 10B and changing the control content according to the detection result, fluctuations in the operation state, a deviation between the theoretical value and the actual operation value, and the like occurred. Even in this case, the feedback control is sequentially performed according to the actual state of the batteries 10A and 10B, and the power of the batteries 10A and 10B can be used reliably.

  Although the above embodiment has been described as returning to step S102 every cycle T, the present invention is not limited to this, and the state of the batteries 10A and 10B is detected again every multiple cycles or every predetermined time. And it is sufficient.

(Modification of the first embodiment)
Hereinafter, modifications of the present embodiment will be described with reference to the drawings.
FIG. 6 is a diagram for explaining a specific configuration of mainly the battery selection switching circuit 10 of the electronic apparatus 1 in place of FIG.

  Since the basic circuit configuration itself is basically the same as that shown in FIG. 2, the same reference numerals are given to the same parts and the description thereof is omitted.

  Further, in place of the remaining voltage detection circuits 11A and 11B in FIG. 2, voltage temperature detection circuits 12A and 12B that detect terminal voltage information and temperature information of the batteries 10A and 10B and send them to the control circuit 40 are provided. To do.

  On the other hand, on the side of the control circuit 40 that receives information from the voltage temperature detection circuits 12A and 12B, the remaining capacity information is obtained from the terminal voltages and temperatures of the batteries 10A and 10B, which are obtained by measurement in advance through experiments or the like. It is assumed that a remaining amount prediction table 41 that is a lookup table to be output is stored in advance in the program memory.

  In the modified example of the present embodiment, instead of calculating the times t1 to tn and T1 to Tn from the remaining amount directly obtained from the battery in step S102 of FIG. 5 and the value of the inductor L, voltage temperature detection is performed. The remaining amount is read by referring to the remaining amount prediction table 42 from the voltage information and temperature information read from the circuits 12A and 12B, and the times t1 to tn and T1 to Tn are calculated from the read result and the value of the inductor L. Since it is the same as the processing of FIG. 5, detailed description of the operation is omitted.

  As described above, according to the modification of the present embodiment, the remaining amount is not directly detected from the batteries 10A and 10B, but each terminal voltage and temperature information is detected and stored in the control circuit 40 side in advance. The remaining amount of the battery 10A or 10B is acquired with reference to the remaining amount prediction table 42 for the battery.

  Thereby, even if the terminal voltage is the same, the remaining amount of the battery that varies depending on the temperature can be grasped more accurately, and the remaining amount of the battery can be drawn out to the maximum and utilized more effectively.

(Second Embodiment)
A second embodiment of the present invention will be described below with reference to the drawings.
In the present embodiment, the configuration and operation of the electronic device 1 having two batteries will be described as an example.

  Note that the schematic configuration of the control system and the power supply system of the electronic device according to the present embodiment is as shown in FIG. 1, and the same parts are denoted by the same reference numerals, and illustration and description thereof are omitted.

  FIG. 7 is a block diagram illustrating specific configurations of the battery selection switching circuit 10 and the voltage matching circuit 20 of the electronic device 1. 7 also has the same basic configuration as the contents shown in FIG. 2, and therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  Further, in place of the remaining voltage detection circuits 11A and 11B in FIG. 2, discharge capacity storage circuits 13A and 13B for the batteries 10A and 10B are provided. These discharge capacity storage circuits 13A and 13B may be built in, for example, the batteries 10A and 10B, and update and store the discharge capacity of the batteries 10A and 10B as needed.

  The control circuit 40 grasps the dischargeable capacity of each of the batteries 10A and 10B by reading out the stored contents of the discharge capacity storage circuits 13A and 13B as necessary, and based on the information, the time t1 to tn, T1 to Tn are calculated.

  In the operation of this embodiment, instead of calculating the times t1 to tn and T1 to Tn from the remaining amount directly obtained from the battery in step S102 of FIG. 5 and the value of the inductor L, the discharge capacity memory circuit 13A , 13B, the discharge capacity of each battery 10A, 10B is calculated from the information on the discharge power, and the time t1 to tn and T1 to Tn are calculated based on the calculated result and the value of the inductor L. Since this is the same, a detailed description of the operation will be omitted.

  As described above, according to this embodiment, in order to accurately grasp the discharge capacity of each of the plurality of batteries and calculate the times t1 to tn and T1 to Tn to operate efficiently, each battery is not subjected to an excessive load. And it becomes possible to draw out the remaining capacity that they have to the maximum and utilize them more effectively.

(Modification of the second embodiment)
Hereinafter, modifications of the present embodiment will be described with reference to the drawings.

  FIG. 8 is a diagram for explaining specific configurations of mainly the battery selection switching circuit 10 and the voltage matching circuit 20 of the electronic apparatus 1 instead of FIG.

  Since the basic circuit configuration itself is basically the same as that shown in FIG. 7, the same reference numerals are given to the same parts and the description thereof is omitted.

  Further, voltage temperature detection circuits 14A and 14B that detect terminal voltage information and temperature information of the batteries 10A and 10B and send them to the control circuit 40 are provided instead of the discharge capacity storage circuits 13A and 13B of FIG. .

  On the other hand, on the side of the control circuit 40 that receives information from the voltage temperature detection circuits 14A and 14B, the voltage values of the batteries 10A and 10B at the time of light load and heavy load are compared in advance through experiments or the like, or the amount of voltage drop It is assumed that a discharge capacity prediction table 42, which is a look-up table that outputs the discharge capacity information of each battery in consideration of temperature conditions, obtained by measuring the above, is stored in advance in the program memory.

  In the operation of this embodiment, instead of calculating the times t1 to tn and T1 to Tn from the remaining amount directly obtained from the battery in step S102 of FIG. 5 and the value of the inductor L, the voltage temperature detection circuit 14A , 14B by referring to the discharge capacity prediction table 42 from the voltage information and temperature information, and reading the discharge capacity of each battery 10A, 10B, and calculating the times t1 to tn and T1 to Tn from the read result and the value of the inductor L. Other than the above, the processing is the same as the processing in FIG. 5, and thus detailed description of the operation is omitted.

  As described above, according to the modification of the present embodiment, the remaining amount is not detected directly from the battery, but the terminal voltage and temperature information is detected, and the battery discharge capability prediction table stored in advance is referred to. The battery discharge capacity was acquired.

  Accordingly, it is possible to more accurately grasp the discharge capacity of the battery in consideration of the temperature condition, and it is possible to draw out the discharge capacity of the battery to the maximum and utilize it more effectively.

  In addition, although the said 1st and 2nd embodiment demonstrated the case where it applies to the electronic device as a general generic name, if this invention is an electronic device which uses a some battery as a power supply, it is. The present invention can be applied to any of them, and can be applied to various devices and systems ranging from mobile phone terminals and personal computers to electric vehicles and the like.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be implemented in appropriate combination as much as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a block diagram showing a schematic configuration of an electronic circuit according to a first embodiment of the present invention. The block diagram which shows the more detailed circuit structure mainly of the battery selection switching circuit based on the embodiment. The figure which illustrates the supply current waveform at the time of discontinuous mode concerning the embodiment. The figure which illustrates the supply current waveform at the time of the continuous mode which concerns on the same embodiment. 7 is a flowchart showing the processing content related to power control when the power is turned on, which is executed by the control circuit according to the embodiment; The block diagram which shows the more detailed circuit structure of the battery selection switching circuit mainly of the modification concerning the embodiment. The block diagram which shows the more detailed circuit structure mainly of the battery selection switching circuit based on the 2nd Embodiment of this invention. The block diagram which shows the more detailed circuit structure of the battery selection switching circuit mainly of the modification concerning the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic device, 10 ... Battery selection switching circuit, 10A, 10B ... Battery, 11A, 11B ... Voltage residual amount detection circuit, 12A, 12B ... Voltage temperature detection circuit, 13A, 13B ... Discharge capacity memory circuit, 14A, 14B ... Voltage temperature detection circuit, 20 ... voltage matching circuit, 30 ... load circuit, 40 ... control circuit, 41 ... remaining amount prediction table, 42 ... discharge capacity prediction table, SW1, SW2 ... switch.

Claims (8)

A plurality of batteries serving as power sources;
A load that operates with power supplied by one of the plurality of batteries;
Switching means for switching a power supply path from the plurality of batteries to the load;
Detecting means for detecting the remaining amount of each of the plurality of batteries;
A unit supply time for each battery that supplies power to the load is calculated according to the remaining amounts of the plurality of batteries detected by the detection means, and the switching means is cyclically switched according to the calculation result, An electronic apparatus comprising: control means for supplying power to the load from one of the batteries. A power storage means for temporarily storing electric power supplied via the switching means between the switching means and the load;
The said control means calculates the conduction | electrical_connection time by the said switching means in the unit supply time for every battery which supplies electric power to the said load according to the time characteristic of the said electrical storage means. Electronics. The detecting means is
Voltage detection means for detecting the terminal voltage of each of the plurality of batteries, temperature detection means for detecting the temperature of each of the plurality of batteries, and temperature, terminal voltage value and remaining amount corresponding to each of the plurality of batteries. Table storage means for storing the associated table;
2. The remaining amount of each of the plurality of batteries is obtained by referring to a table of the table storage unit based on a terminal voltage detected by the voltage detection unit and a temperature detected by the temperature detection unit. Electronic equipment.   Detection of the remaining amount of each of the plurality of batteries by the detection unit, and calculation of a unit supply time for each of the batteries according to the remaining amount of the plurality of batteries by the control unit are periodically executed. The electronic device according to claim 1. The detecting means is
Detecting the discharge capacity of each of the plurality of batteries stored in the discharge capacity storage means instead of the remaining amount of each of the plurality of batteries, and updating and storing the detected discharge capacity of each of the plurality of batteries as needed;
The control means includes
A unit supply time for each battery that supplies power to the load is calculated according to each discharge capability of the plurality of batteries stored by the detection means, and the switching means is cyclically switched according to the calculation result, 2. The electronic apparatus according to claim 1, wherein power is supplied to the load from one of the batteries. The detecting means is
Voltage detection means for detecting the terminal voltage of each of the plurality of batteries, temperature detection means for detecting the temperature of each of the plurality of batteries, and temperature, terminal voltage value and discharge capability corresponding to each of the plurality of batteries. Table storage means for storing the associated table;
Instead of the remaining amount of each of the plurality of batteries, the discharge capacity of each of the plurality of batteries with reference to the table of the table storage unit by the terminal voltage detected by the voltage detection unit and the temperature detected by the temperature detection unit Get
The control means calculates a unit supply time for each battery that supplies power to the load according to the discharge capacity of the plurality of batteries detected by the detection means, and cyclically switches the switching means according to the calculation result. The electronic device according to claim 1, wherein power is supplied to the load from one of the plurality of batteries. In an electronic device including a plurality of batteries serving as a power source, a load that operates by power supplied from at least one of the plurality of batteries, and a switch circuit that switches a power supply path from the plurality of batteries to the load A power control method,
A detection step of detecting the remaining amount of each of the plurality of batteries;
A unit supply time for each battery that supplies power to the load is calculated in accordance with the remaining amounts of the plurality of batteries detected in the detection step, and the switch circuit is cyclically switched according to the calculation result. And a control step of supplying power to the load from one of the batteries. Built-in electronic device including a plurality of batteries serving as a power source, a load that operates by power supplied from at least one of the plurality of batteries, and a switch circuit that switches a power supply path from the plurality of batteries to the load A program executed by a computer,
A detecting step for detecting a remaining amount of each of the plurality of batteries;
A unit supply time for each battery that supplies power to the load is calculated according to each remaining amount of the plurality of batteries detected in the detection step, and the switch circuit is cyclically switched according to the calculation result, A program for causing a computer to execute a control step of supplying power to the load from one of the batteries.

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