WO2015076188A1

WO2015076188A1 - Multiple-battery power supply device

Info

Publication number: WO2015076188A1
Application number: PCT/JP2014/080138
Authority: WO
Inventors: 重美川瀬
Original assignee: 重美川瀬
Priority date: 2013-11-20
Filing date: 2014-11-14
Publication date: 2015-05-28
Also published as: JP2015100220A

Abstract

Provided is a multiple-battery power supply device in which a plurality of secondary batteries are embedded, an effective using operation is possible independently of the states of charge of the secondary batteries, and, for example, the batteries can be changed over to each other without being affected by the use of the secondary batteries even when charging from a solar panel occurs. When a connectable and disconnectable load switch (SWL) between chargeable and dischargeable secondary batteries (A, B) and a load is turned on, resistors (RA, RB) are connected to the respective secondary batteries (A, B) and the secondary batteries (A, B) are discharged. When the discharging is performed, the terminal voltages of the respective secondary batteries (A, B) are measured and stored. From the descending order (or ascending order) of the stored terminal voltages, a specific one of the secondary batteries (A, B) is selected as one of the secondary batteries (A, B) for supplying power to the load and the power is supplied to the load from the one of the secondary batteries (A, B). At this time, when a load voltage drops to a specific voltage or less, the one of the secondary batteries (A, B) for supplying the power to the load is changed over to one of the secondary batteries (A, B) having the next higher order of the terminal voltage.

Description

Multiple battery power supply

The present invention relates to a power supply device with a built-in battery in which two or more batteries are mounted, and relates to a multiple battery power supply device related to a method for outputting from a plurality of batteries and a method for charging a plurality of batteries.
The output to the load may be a DC voltage or an AC voltage. In addition, regarding the voltage, the standard voltage may be 105V, 200V, or 12V, 24V. Any standard voltage of the country in which the present invention is used may be used.

As Patent Document 1, a main power source of a vehicle that performs idling stop, a power storage unit that is electrically connected to the main power source, a charging circuit that is electrically connected to the power storage unit and charges the power storage unit, A starter that is electrically connected to the power storage unit; a power storage unit voltage detection circuit that is electrically connected to the power storage unit and detects a power storage unit voltage; and the charging circuit, the starter, and the power storage unit voltage detection circuit; A control circuit that is electrically connected, and the control circuit charges the power storage unit with the charging circuit until the power storage unit voltage is determined based on a running state of the vehicle. The present invention relates to a power supply device that drives the starter with at least electric power of the power storage unit after idling stop of the vehicle.

According to the power supply device of Patent Document 1, if the running state is gentle, charging can be performed such that the voltage of the power storage unit is lowered, so that the progress of deterioration of the power storage unit can be suppressed during that time. Therefore, there is an effect that a power supply device that can obtain higher reliability can be obtained.
Further, according to the power supply device, when the power storage unit is deteriorating before reaching the deterioration limit, charging is performed so that the power storage unit voltage is lowered, and accordingly, the progress of deterioration of the power storage unit is suppressed accordingly. be able to. Furthermore, when the power storage unit is deteriorating, charging is performed so that the power storage unit voltage is lowered, so that the engine can be restarted, but the cranking period becomes longer. As a result, the cranking period can be extended before the power storage unit deteriorates and the engine cannot be restarted, thereby prompting the driver to replace the power storage unit at an early stage. Thus, there is an effect that a power supply device capable of obtaining the above can be obtained.

The power supply device of Patent Document 2 is a power supply device that supplies power to a drive unit while alternately switching between the power supply and the battery, and includes a power supply voltage detection unit that detects a voltage on the power supply side, and a power supply device on the battery side. Detected by battery-side voltage detecting means for detecting voltage, switching means for switching between a charging circuit for charging the battery from the power source, a discharging circuit for discharging from the battery to the driving unit, and battery-side voltage detecting means Storage means for storing a first voltage set on the basis of the battery side voltage and a second voltage set on the basis of the battery side voltage, and that the power supply side voltage exceeds the first voltage, or It is determined that the power supply side voltage is lower than the second voltage, and the battery is charged from the power supply when the power supply side voltage exceeds the first voltage, and the power supply side voltage is the second voltage. Below Sometimes, a command is output to the switching means to discharge from the battery, and the first voltage and the second voltage of the storage unit are set to the battery side voltage detected by the battery side voltage detection means. Control means for rewriting on the basis of the charging means, and transformer means for transforming a charging voltage charged in the battery and a discharging voltage discharged from the battery.

Therefore, in the power supply device of Patent Document 2, the voltage output from the circuit via the power supply device is always kept above a certain level, and when the battery voltage is above a certain level, the amount of charge from the power source is reduced to prevent overcharging. can do. Therefore, according to the present invention, it becomes easy to replace the battery of the existing power supply device with a lithium ion battery or the like, and it is possible to prevent the occurrence of problems due to overcharge or insufficient discharge voltage. As described above, the power supply device of Patent Document 2 has an effect that the transformer unit represented by the DC-DC converter + lithium ion battery or the like can behave the same as the lead battery in the conventional power supply circuit.

JP2013-179801A JP2012-50184

As described above, in Patent Document 1 and Patent Document 2, charging / discharging is performed according to the position of the power supply device, and charge / discharge characteristics are changed according to the power supply device. However, as in Patent Document 1 and Patent Document 2, if the power supply device has a specific use, characteristics such as charging and discharging may be determined on the premise of the use.
However, when the power supply device is used without being restricted to a specific purpose, it is unclear how the discharge characteristics and the charge characteristics are desirable. In addition, when charging from a solar panel and charging from a commercial power source, the internal impedance of the solar panel is high, so that there is a problem that efficient charging cannot be performed unless a charging circuit is formed in consideration thereof.

That is, when two independent secondary batteries are used, charging and discharging can be performed individually. For example, when one discharge is performed, the other can be charged. In particular, when two independent secondary batteries are used, charging and discharging can be performed individually, but there is a problem that the number of times of charging and discharging is forgotten and efficient use is not possible. In addition, there is a case where both secondary batteries are forgotten to be charged and both cannot be used. When there are three or more independent secondary batteries, it is usually impossible to manage them.

Therefore, the present invention incorporates a plurality of secondary batteries, and can be operated efficiently without being affected by the state of charge of the secondary battery. For example, even when charged from a solar panel, An object of the present invention is to provide a multiple battery power supply device that can switch batteries without being affected by use.

A multiple battery power supply device according to the invention of claim 1 comprises a plurality of rechargeable secondary batteries, and a load switch that can be intermittently connected between the plurality of secondary batteries and a load. When the switch is turned on, a resistor is connected to each of the plurality of secondary batteries to perform discharge, and when the discharge is performed, individual terminal voltages of the plurality of secondary batteries are measured. The individual terminal voltages of the plurality of secondary batteries are stored. A specific secondary battery is selected as a secondary battery for supplying power to the load from the higher (or lower) terminal voltage stored in the terminal voltage storage circuit, and power is supplied from the secondary battery to the load. . At this time, when the load voltage drops below a specific voltage, the secondary battery that supplies power to the load is sequentially switched to the secondary battery having the next highest terminal voltage. Here, the plurality of chargeable / dischargeable secondary batteries may be secondary batteries capable of normal charge / discharge.

Further, the load switch that can be intermittently connected between the plurality of secondary batteries and the load may be a switch such as a snap switch or a knife switch having a predetermined withstand voltage and current capacity. Any switch that can be intermittently connected between the battery and the load may be used.
And, when the load switch is turned on, the resistance discharge circuit is connected to each of the plurality of secondary batteries for discharging, and from the voltage drop of the load resistance at that time, the secondary battery This is to estimate the magnitude of the internal resistance. Here, the energization time is specified as 1 to 10 seconds. Longer time energization becomes more accurate, but the resistance value originally has an error, so the energization time was set within the range of 1 to 10 seconds. The resistance discharge circuit is a parallel circuit in which a secondary battery and a resistor are connected in a one-to-one relationship, and since no other circuit elements are included, it can be regarded as a series circuit.

Further, the voltage measuring circuit is a circuit for measuring individual terminal voltages of the plurality of secondary batteries when the resistance discharge circuit is discharging, and measuring the output voltage of the secondary batteries. Yes, the measurement of the present invention may be any measurement method that employs a comparative theory that matches the spirit of the invention, and does not require precise measurement.
Furthermore, the terminal voltage storage circuit may be any circuit that stores a large or small terminal voltage of each of the plurality of secondary batteries. In this storage, if two secondary batteries are used, which terminal voltage is higher, or if there are three secondary batteries, the magnitude relationship of the three stages of terminal voltages may be known. Further, since the order of increasing potential corresponds to the order of decreasing potential, they are technically the same.
In addition, the selection circuit selects a secondary battery that supplies power to a load in order from a secondary battery having a higher terminal voltage stored in the terminal voltage storage circuit, and supplies power from the secondary battery to the load. When the load voltage drops below a specific voltage, the secondary battery that supplies power to the load is sequentially switched to the secondary battery with the next highest terminal voltage.

When power is supplied from the secondary battery to the load by the selection circuit of the multiple battery power supply device according to the invention of claim 2, when the load voltage drops below a specific voltage, power is supplied to the current load. The term “below a specific voltage at which the secondary battery is switched to the secondary battery having the next terminal voltage” means that the voltage is 85 to 90% of the rated voltage of the secondary battery.
The inventors measured the voltage at the end of discharge of the secondary battery. However, there are errors depending on the rated voltage and internal resistance of the secondary battery, the type of secondary battery and the magnitude of the additional current, and the characteristics of the new and old secondary batteries change. Could not be aggregated. Overall, it was judged that “voltage of 85 to 90% of the rated voltage of the secondary battery” was “the voltage at the end of the charge after charging the secondary battery”. This judgment is presumed that the logic becomes clear with the numerical value of the secondary battery when it is analyzed, but it is a value that can be operated without support in the actual machine.

According to a third aspect of the present invention, there is provided a multi-battery power supply device comprising: a plurality of rechargeable secondary batteries and a solar panel for photoelectric conversion; A resistance discharge circuit that discharges by connecting a resistance value to each, a terminal voltage storage circuit that stores individual terminal voltages of the plurality of secondary batteries, and the terminal voltage when the charge switch is connected A selection circuit that selects the secondary battery as a secondary battery that is charged from the solar panel in descending order of the terminal voltage stored in the storage circuit, and when the charge switch is turned on, the terminal voltage storage circuit The secondary battery which receives charge from a solar panel is selected in order with the low terminal voltage memorize | stored in this.
Here, the plurality of freely chargeable / dischargeable secondary batteries may be secondary batteries that can be charged and discharged normally.

In addition, the charge switch is a switch that can be intermittently provided between a plurality of rechargeable secondary batteries and a solar panel, such as a snap switch or a knife switch having a predetermined current capacity, What is necessary is just to be able to interrupt between a secondary battery and load.
The resistance discharge circuit is a circuit that discharges by connecting a resistance value to each of the plurality of secondary batteries.
Further, the terminal voltage storage circuit stores individual terminal voltages of the plurality of secondary batteries. What is necessary is just to memorize | store the large and small of each terminal voltage of these secondary batteries. The timing of this storage may be within a predetermined time from when any switch is first operated or from the time when the switch is first operated. In this storage, if two secondary batteries are used, which terminal voltage is higher, or if there are three secondary batteries, the magnitude relationship of the three stages of terminal voltages may be known.
Furthermore, the selection circuit selects the secondary battery as a secondary battery that is charged from the solar panel in descending order of the terminal voltage stored in the terminal voltage storage circuit when the charging switch is connected. When the charging switch is turned on, the circuit is selected as a secondary battery that is charged from the solar panel in descending order of the terminal voltage stored in the terminal voltage storage circuit.

According to a fourth aspect of the present invention, the plurality of secondary batteries are two secondary batteries.
Here, the plurality of secondary batteries are specified as two, and the control is alternately performed.

The multiple battery power supply device according to claim 1 includes a plurality of rechargeable secondary batteries and a load switch that is intermittently provided between the plurality of secondary batteries and a load, and supplies power to the load. Therefore, when a load switch is turned on, the resistance discharge circuit discharges by connecting a resistance value to each of the plurality of secondary batteries. When discharging is performed by the resistance discharge circuit, individual terminal voltages of the plurality of secondary batteries are measured by a voltage measurement circuit. Then, the individual terminal voltages of the plurality of secondary batteries are stored in the terminal voltage storage circuit. Further, when selecting a secondary battery that supplies power to the load in descending order of the terminal voltage stored in the terminal voltage storage circuit, and supplying power from the secondary battery to the load, the load voltage falls below a specific voltage. When the selection circuit determines that the battery voltage has decreased, the secondary battery that supplies power to the load is sequentially switched to the secondary battery having the next highest terminal voltage.

Therefore, in order for the load to be supplied with power from the multiple battery power supply device, first, a secondary battery having a high power supply voltage is selected and used as a power source. However, when the selection circuit determines that the load voltage has dropped below a specific voltage during use of the power supply, the secondary battery that supplies power to the load is switched to the secondary battery having the next higher terminal voltage. Therefore, when the battery voltage decreases, secondary batteries with low battery voltage (low power consumption) are sequentially selected and power supply is continued.
Thus, since the multiple battery power supply device is used from a secondary battery having a large charge amount of power of two or more secondary batteries, stable power supply can be performed.

The secondary battery that supplies power to the current load when the load voltage drops below a specific voltage when power is supplied from the secondary battery to the load. The specific voltage or lower for switching the battery to the secondary battery of the next terminal voltage is a voltage that is 85 to 90% of the rated voltage. In addition to the effect of claim 1, the specific voltage or lower Since the time when the load voltage decreases can be regarded as the end point of charging, the utilization rate of discharging / charging is improved.

A plurality of battery power supply devices according to claim 3 include a plurality of rechargeable secondary batteries, a charge switch that is intermittently provided between the plurality of secondary batteries and a solar panel, and the plurality of secondary batteries. Each of the plurality of secondary batteries is connected to the terminal voltage storage circuit when any one of the switches operates. When the charging switch is connected by a selection circuit, the secondary battery is selected as a secondary battery that is charged from the solar panel in descending order of the terminal voltage stored in the terminal voltage storage circuit. Is.
Therefore, when any switch of the device operates, the individual terminal voltages of the plurality of secondary batteries are stored in the terminal voltage storage circuit. When a charge switch that can be intermittently inserted between the plurality of secondary batteries and the solar panel is turned on, the secondary battery is charged from the solar panel. The secondary battery is selected as the secondary battery that is charged from the next solar panel in the descending order of the terminal voltage stored in the terminal voltage storage circuit during charging of the secondary battery. Therefore, if there is a secondary battery that has been fully charged, the next secondary battery can be charged.

In the multiple battery power supply device according to claim 4, since the plurality of secondary batteries are two secondary batteries, in addition to the effect according to any one of claims 1 to 3. Thus, the secondary battery is alternately switched, and the control on the load side or the power source side can be simplified.

FIG. 1 is a circuit diagram of a secondary battery, a resistor, and a charge / discharge portion of a multiple battery power supply device according to an embodiment of the present invention. FIG. 2 is an overall circuit configuration diagram of the multiple battery power supply device according to the embodiment of the present invention. FIG. 3 is a flowchart of a program executed by the microcomputer that performs the overall operation of the multiple battery power supply apparatus according to the embodiment of the present invention. FIG. 4 is a functional configuration diagram showing the overall functions of the multiple battery power supply device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the embodiments, the same reference numerals and the same reference numerals are the same or corresponding functional parts, and therefore, redundant description thereof is omitted here.

[Embodiment]
1 and 2, a secondary battery A and a secondary battery B are secondary batteries that can be charged and discharged. Specific examples of secondary batteries include lead storage batteries, lithium ion secondary batteries, lithium ion polymer secondary batteries, nickel / hydrogen storage batteries, nickel / cadmium storage batteries, nickel / iron storage batteries, nickel / zinc storage batteries, silver oxide / There are zinc storage batteries. Usually, the secondary battery A and the secondary battery B are secondary batteries of the same standard.

The secondary battery A and the secondary battery B are connected in series with a main power contact MSa and a main power contact MSb constituting the main power switch MS. For example, in the case of using 12V, the resistor RA and the resistor RB for which 2 to 10Ω are selected are connected to the auxiliary contact SSa or the auxiliary contact SSb of the auxiliary switch SS to the resistor RA and the resistor RB.
The two main power contact MSa and the main power contact MSb constituting the main power switch MS are switches that turn on the power depending on whether or not to use the multiple battery power supply device. .
The secondary battery A and the secondary battery B are connected in series to the main power contact MSa and the main power contact MSb constituting the main power switch MS, and the auxiliary switch is connected to the resistor RA and the resistor RB with respect to the series connection. A circuit in which auxiliary contacts SSa or auxiliary contacts SSb of SS are connected in series is connected in parallel. Since this parallel circuit has no other circuit elements, it can also be regarded as a series connection.

Therefore, the voltage of the secondary battery A in the series circuit of the main power contact MSa constituting the secondary battery A and the main power switch MS can be detected as one input voltage (terminal C in FIG. 1) of the operational amplifier OP1. The voltage of the secondary battery B in the series circuit of the secondary battery B and the main power contact MSb constituting the main power switch MS can be detected as one input voltage (terminal D in FIG. 1) of the operational amplifier OP2.
Further, the voltage detection of the secondary battery A and the secondary battery B can be performed by comparing voltages input to both terminals (terminals A and B in FIG. 1) of the operational amplifier OP0.

In order to extract electric power from the secondary battery A and / or the secondary battery B, the load switch SWL is turned on. By turning on the load switch SWL, whether the voltage of the secondary battery A or the secondary battery B whose voltage is detected is high or low is a result of the comparison voltage of both terminals of the operational amplifier OP0. On the other hand, the output of the operational amplifier OP0 is extracted from ("1" or "0").

Input when charging the secondary battery A and the secondary battery B is divided into charging from the commercial power source 50 and charging from the solar panel 51 that performs photoelectric conversion.
When charging from the commercial power source 50, the voltage and current thereof can be any voltage and current. Therefore, when charging from the commercial power source 50, the secondary battery A and the secondary battery B are simultaneously charged. Will do.
Moreover, even if a relatively large area is required as in the solar panel 51, the rated voltage and the rated current thereof are lowered. Therefore, the capacity of one panel may be adjusted to one secondary battery to obtain a charging voltage. Many. Therefore, in the case of the solar panel 51, the secondary battery A or the secondary battery B is charged on a one-to-one basis.

In terms of an electric circuit, a resistor RA and a resistor RB are connected in parallel on the secondary battery A side or the secondary battery B side. The resistor RA and the resistor RB monitor the output of the operational amplifier OP0 3 seconds after the main power switch MS is turned on, and the secondary battery A or the secondary battery B within 1 to 10 seconds (usually within 3 to 5 seconds). It is determined whether or not the potential on the side is high, and it is stored in the built-in memory of the microcomputer CPU.
Note that the resistance RA and the resistance RB have a small error (RA-RB) that is affected by quality control, and the characteristic error between the resistance RA and the resistance RB is small compared to the standard product. is there. The resistance values of the resistor RA and the resistor RB have a low resistance of about 2 to 10Ω when 12 V is used, and have a power capacity that can be used repeatedly within 10 seconds.

The load switch SWL is used when executing a mode in which power is supplied from the secondary battery A and the secondary battery B of the multiple battery power supply device of the present embodiment to the load.
A relay Ry- ₀ for selecting the secondary battery A or the secondary battery B is connected to the load switch SWL. This relay Ry- ₀ switches contacts according to the magnitude of the electromotive force of the secondary battery A and the secondary battery B detected by the operational amplifier OP0. That is, it corresponds to the detection of the magnitude of the voltage drop of the operational amplifier OP1 and the operational amplifier OP2.
Therefore, the output of the relay Ry- ₀ is not uniquely determined by the load switch SWL, and varies depending on other conditions.

In addition, the charging switch SWC1 and the charging switch SWC2 that are charged from the solar panel 51 execute a mode for charging the multiple battery power supply device of the present embodiment.
The charging circuit of FIG. 1 includes a charging switch SWC0 that charges the secondary battery A and the secondary battery B simultaneously from the commercial power source 50. Specifically, the relay Ry- ₁ is operated by the charging switch SWC1, and the relay Ry- ₂ is operated by the charging switch SWC2. The relay Ry- ₁ and the relay Ry- ₂ can be operated at the same time by the charge switch SWC1. Then, the relay R _y-0 is operated by the charge switch SWC0.
In addition, when charging from the solar panel 51, the secondary battery A or the secondary battery B whose output voltage is estimated to be low is estimated to be charged. Select as.

The voltage detection outputs of the secondary battery A and the secondary battery B are input to the operational amplifier OP0, where it is determined which output is larger. It is concluded by comparing the input terminal voltage of the operational amplifier OP0 which is larger or smaller between the secondary battery A and the secondary battery B. In addition, the fact that the voltage drop of the operational amplifier OP1 has increased in the discharged state is that the voltage drop at one terminal of the operational amplifier OP1 is detected, and the terminal input VZ1 of the constant voltage circuit CO1 is compared, and the voltage drop terminal input An increase in the amount is detected. Similarly, the increase in the voltage drop of the operational amplifier OP2 in the discharge state detects a voltage drop at one terminal of the operational amplifier OP2, and compares the terminal inputs VZ2 of the constant voltage circuit CO1 and the constant voltage circuit CO2. An increase in terminal input due to a voltage drop is detected.

Here, the constant voltage circuit CO1 and the constant voltage circuit CO2 include three resistors R1, R2, R3, and a Zener diode ZD, and form a simple constant voltage circuit as shown in FIG. That is, the power supply voltage + Vcc is applied to the series circuit of the resistor R1, the resistor R2, and the resistor R3. The Zener diode ZD voltage is calculated at a ratio of R3 / (R2 + R3), and becomes the terminal input VZ1 and the terminal input VZ2 of the operational amplifier OP1 and the operational amplifier OP2. The output voltage of the secondary battery A or the secondary battery B is input to the other input of the operational amplifier OP1 and the operational amplifier OP2.
Therefore, the outputs of the operational amplifier OP1 and the operational amplifier OP2 are output from “1” to “0” when the voltages of the secondary battery A and the secondary battery B are lower than the constant voltage input.

Outputs of the operational amplifiers OP0 to OP2 are sent to the photocoupler PH1. The photocoupler PH1 and the photocoupler PH2 are for insulating the control signal, and the signal does not change even when the individual circuit configurations are viewed.
That is, the outputs of the operational amplifiers OP1 to OP3 are directly input to the microcomputer CPU via the photocoupler PH1, that is, without changing “0” or “1”, and are processed by the microcomputer CPU. The output of the photocoupler PH2.

Outputs of the operational amplifiers OP0 to OP2 are input to the microcomputer CPU via the photocoupler PH1, and the load switch SWL and the charge switches SWC0 to charge switch SWC2 are discharged or charged by the multiple battery power supply device of this embodiment. Is used to indicate. Further, as the output of the microcomputer CPU, the outputs of the relay RY ₋₁ , the relay RY ₋₂ and the relay RY ₋₃ are output via the photocoupler PH2.

Here, the microcomputer CPU starts the processing of this routine when the main power switch MS is turned on. When the main power switch MS is turned on, the processing of the program of FIG. 3 is started, and the function shown in FIG. 4 consisting of FIG. 1 and FIG.
First, if there are two secondary batteries A and secondary battery B, the magnitude of the voltage drop of secondary battery A or secondary battery B is input in step S1. When there are two or more, the number of voltage magnitude information is written. Specifically, the voltage drop of each battery is detected to determine whether or not the discharge state is large, and the batteries are arranged in order (corresponding) in descending order of voltage or arranged in order from low to high. It is to be noted that an accurate voltage value is not necessary when implementing the present invention.

In step S2, it is determined whether the load switch SWL is turned on, or in step S3, it is determined by the charge switch SWC0 or the charge switch SWC1 that the multi-battery power supply device of the present embodiment is to be charged. Is used to determine if it is going to be charged. That is, it is determined in step S2 that the load switch SWL is turned on, and it is determined in step S3 that charging is to be performed, or in step S4, it is determined whether charging is to be performed using the commercial power source 50.

When charging is performed using the commercial power supply 50, the selection of the charging voltage and charging current can be arbitrarily set. Therefore, normally, a large charging voltage and charging current can be obtained, and therefore a plurality of chargings are simultaneously started in step S5. For example, charging of all the secondary batteries 52 is started in step S5. In step S6, it is determined whether or not the voltage drop of the secondary battery is a voltage Vu corresponding to the completion of charging. In step S7, it is determined whether or not the voltage drop is increased to a voltage Vu corresponding to the completion of charging. When the drop rises to the voltage Vu corresponding to the completion of charging, the corresponding secondary battery 52 is charged.

When it is detected in step S2 that the load switch SWL is turned on, the secondary battery 52 whose voltage drop is maintained at the voltage Vu corresponding to the completion of charging is selected in step S10, and the secondary battery 52 is selected in step S11. The battery is used to start supplying output to the load. The routine from step S10 to step S12 is repeatedly executed until the discharge in step S11 decreases to a voltage drop Vd corresponding to the discharge completion state.
Then, when the voltage drop is reduced to the voltage Vd corresponding to the completion of discharge in step S12, the secondary battery 52 corresponds to the voltage Vu corresponding to the completion of charging, the voltage drop immediately before the discharge of the secondary battery 52 is completed in step S13. In step S14, the secondary battery 52 is discharged. In step S15, when there is no voltage Vd whose voltage drop corresponds to the completion of discharge, it is determined in step S15. Is detected, and the switching of the secondary battery 52 is finished in step S16.

When it is detected that the charging switch SWC0 to the charging switch SWC2 are turned on in step S3, if a battery having a large voltage Vd corresponding to the completion of charging is selected in step S21, the secondary battery 52 is selected in step S22. Charging is started. When a battery having a large voltage drop in a discharged state is selected, it is detected in step S23 that the voltage drop has increased to a voltage Vu corresponding to the completion of charging.

In step S24, a battery having a voltage Vd having a voltage drop corresponding to completion of discharge is selected next, and charging of the secondary battery 52 is started by the corresponding battery in step S25. When a battery in a discharged state is selected in step S25, it is determined in step S26 whether the voltage drop has increased the voltage Vu corresponding to the completion of charging. When the charging state is completed and charging of the secondary battery 52 is completed, If it is confirmed in step S27 that another battery is present, this routine is exited.

Functionally, the configuration shown in the multiple battery power supply device of the embodiment of FIGS. 1 to 3 can be summarized as the functional diagram of FIG.
A plurality of rechargeable secondary batteries 52 such as a secondary battery A or a secondary battery B, a load switch SWL between the secondary battery 52 and a load, and a load switch SWL are turned on. A secondary battery A and a resistor RA for discharging by connecting a resistor comprising a resistor RA and a resistor RB to each of the secondary batteries 52; a resistor discharge circuit 53 comprising a parallel circuit of the secondary battery B and a resistor RB; When the resistance discharge circuit 53 is discharging, the voltage measurement circuit 55 including the operational amplifier OP0 to the operational amplifier OP2 that measures individual terminal voltages of the secondary battery 52, and the micro that stores the individual terminal voltages of the secondary battery 52 are stored. A terminal voltage storage circuit 56 including a storage unit of the computer CPU and a secondary battery 52 that supplies power to the load in the order of the terminal voltages stored in the terminal voltage storage circuit 56 are selected. When the power is supplied to the load, the microcomputer CPU sequentially switches the secondary battery 52 that supplies power to the load to the secondary battery 52 of the next terminal voltage when the load voltage drops below a specific voltage. A selection circuit 57 is provided.

Therefore, in order for the load to be supplied with power from the multiple battery power supply device, first, a secondary battery 52 having a high power supply voltage is selected and used as a power source. However, when the selection circuit 57 determines that the load voltage has dropped below a specific voltage during use of the power supply, the secondary battery 52 that supplies power to the load is switched to the secondary battery 52 having the next highest terminal voltage. . Therefore, when the battery voltage decreases, the secondary battery 52 having a low battery voltage (low power consumption) is sequentially selected and power supply is continued.
Thus, since the multiple battery power supply device is used from the secondary battery 52 having a large charge amount of power of the two or more secondary batteries 52, stable power supply can be performed.

As described above, the plurality of battery power supply devices are provided with a plurality of rechargeable secondary batteries 52, a load switch SWL that is intermittently provided between the plurality of secondary batteries 52 and the load, and a load switch SWL. A secondary battery A and a resistor RA, which discharge by connecting a resistor comprising a resistor RA and a resistor RB to each of the plurality of secondary batteries 52, and a resistor comprising a parallel circuit of the secondary battery B and a resistor RB. A discharge circuit 53; a voltage measurement circuit 55 comprising operational amplifiers OP0 to OP2 for measuring individual terminal voltages of the plurality of secondary batteries 52 when the resistance discharge circuit 53 is discharging; and a plurality of secondary circuits A terminal voltage storage circuit 56 including a storage unit of a microcomputer CPU that stores individual terminal voltages of the battery 52, and a secondary battery that supplies power to the load in the order of the terminal voltages stored in the terminal voltage storage circuit 56 When the power is supplied from the secondary battery A and the secondary battery B to the load when the load voltage drops below a specific voltage, the secondary battery A or secondary battery that supplies power to the load is selected. A selection circuit 57 including a microcomputer CPU that sequentially switches the battery B to the secondary battery A or the secondary battery B having the next terminal voltage is provided.

Therefore, in order for the load to be supplied with power from the plurality of battery power supply devices, first, a plurality of secondary batteries 52 having a high power supply voltage are selected and used as a power source. However, when the selection circuit 57 determines that the load voltage has dropped below a specific voltage during use of the power supply, the secondary battery 52 that supplies power to the load is switched to the secondary battery having the next highest terminal voltage. Therefore, when the battery voltage decreases, the secondary battery 52 having a low battery voltage (low power consumption) is sequentially selected to continue supplying power.
Thus, since the multiple battery power supply device is used from the secondary battery 52 having a large charge amount of power of the two or more secondary batteries 52, stable power supply can be performed.

The multi-battery power supply device of the above embodiment includes a plurality of rechargeable secondary batteries 52, charge switches SWC0 to SWC3 that are intermittently provided between the plurality of secondary batteries 52 and the solar panel 51, and charging. When switch SWC0 thru | or charge switch SWC3 are turned on, the selection circuit 57 which selects as the secondary battery 52 which receives charge from the solar panel 51 in order of the terminal voltage memorize | stored in the terminal voltage memory | storage circuit 56 is provided.
As described above, the charging switch includes a plurality of rechargeable secondary batteries 52 and a charge switch that is intermittently provided between the plurality of secondary batteries 52 and the solar panel 51. When turned on, the selection circuit 57 is selected as the secondary battery 52 that is charged from the solar panel 51 in the descending order of the terminal voltage stored in the terminal voltage storage circuit 56. In particular, since the output from the solar panel 51 is very small compared to the normal load, it can be handled without performing a plurality of charges at the same time.

In addition, since the plurality of secondary batteries 52 of the multiple battery power supply device of the above embodiment are two secondary batteries 52, the secondary batteries 52 are alternately switched, and the load side Or, control on the power supply side can be simplified.

The multiple battery power supply device of the above embodiment includes a plurality of rechargeable secondary batteries 52, and charge switches SWC0 to SWC2 that are intermittently connected between the plurality of secondary batteries 52 and the commercial power source 50. A plurality of rechargeable secondary batteries 52 that are selected as secondary batteries 52 that charge all the secondary batteries 52 when the charging switches SWC0 to SWC2 are turned on, and the plurality of secondary batteries 52, Since the charge switches SWC0 to SWC2 that can be intermittently connected to the commercial power source 50 and the charge switches SWC0 to SWC2 are turned on, all the secondary batteries 52 are selected as the secondary batteries 52 to be charged. When charging a plurality of rechargeable batteries 52 that are freely chargeable / dischargeable from the commercial power supply 50, the charging current can be freely selected, so that high-speed charging can be performed.

When power is supplied from the secondary battery 52 to the load by the selection circuit 57, if the load voltage drops below a specific voltage, the secondary battery 52 that is currently supplying power to the load is set to the next terminal voltage. The term “below a specific voltage for switching to the secondary battery 52” means that the voltage is 85 to 90% of the rated voltage of the secondary battery 52.
The inventors measured the voltage at the end of the discharge of the secondary battery 52. There are errors depending on the rated voltage and internal resistance of the secondary battery 52, the type of secondary battery and the magnitude of the additional current, and the characteristics of the new and old secondary batteries 52 change. Could not be aggregated. However, as a whole, it was determined that “the voltage of 85 to 90% of the rated voltage of the secondary battery 52” was “the voltage at the end of the charge when the secondary battery 52 was charged”. This determination is a value that can be operated without support in an actual machine, although it is presumed that the logic becomes clear from the numerical value when the type or the like of the secondary battery 52 is analyzed.

The plurality of secondary batteries A or secondary batteries B that can be freely charged and discharged can be two or more secondary batteries 52.
The load switch SWL is openable and closable between a plurality of secondary batteries 52 and their loads. The resistance discharge circuit 53 may be any circuit that discharges by connecting the resistors RA and RB to each of the plurality of secondary batteries 52 when the load switch SWL is energized.

Further, the voltage measuring circuit 55 may be a circuit that measures individual terminal voltages of the plurality of secondary batteries 52 when the resistance discharging circuit 53 is discharging. Furthermore, the terminal voltage storage circuit 56 stores individual terminal voltages of the plurality of secondary batteries 52, and the storage form does not specify a special form.
The terminal voltage storage circuit 56 only needs to have a function of storing individual terminal voltages of the plurality of secondary batteries 52 when any one of the switches provided in the apparatus operates. .

In addition, the selection circuit 57 is a secondary battery 52 that supplies power to the load in the order of the terminal voltages stored in the terminal voltage storage circuit 56. When the power is supplied from the secondary battery 52 to the load, a specific voltage is selected. Any circuit that switches the secondary battery 52 that is currently supplying power to the load to the secondary battery 52 of the next terminal voltage when the load voltage decreases below.
The selection circuit 57 is a secondary battery 52 as a secondary battery 52 that receives charge from the solar panel 51 in order of increasing terminal voltage stored in the terminal voltage storage circuit 52 when the charging switches SWC0 to SWC2 are connected. Any circuit that selects 52 may be used.
The charging switches SWC0 to SWC2 may be any switches that can be intermittently connected between the plurality of secondary batteries 52 and the solar panel 51 that performs photoelectric conversion.

A secondary battery B rechargeable battery RA resistor RB resistance SS auxiliary switch MS main power switch SWL load switch OP0 ~ OP2 operational amplifier SWC0 ~ SWC2 charging switch CPU microcomputer PH1, PH2 photocoupler CPU microcomputer CO1, CO2 constant voltage circuit Ry _{- 0} to Ry- ₂ relay 50 commercial power supply 51 solar panel 52 secondary battery 53 resistance discharge circuit 55 voltage measurement circuit 56 terminal voltage storage circuit 57 selection circuit

Claims

A plurality of rechargeable secondary batteries,
A load switch that can be intermittently connected between the plurality of secondary batteries and the load; and
When the load switch is connected, a resistance discharge circuit that discharges by connecting a resistance value to each of the plurality of secondary batteries;
A voltage measuring circuit for measuring individual terminal voltages of the plurality of secondary batteries when discharging by the resistive discharge circuit;
A terminal voltage storage circuit for storing the individual terminal voltages of the plurality of secondary batteries;
A secondary battery that supplies power to a load in the order of terminal voltages stored in the terminal voltage storage circuit, and when power is supplied from the secondary battery to the load, when the load voltage drops below a specific voltage, the current load And a selection circuit for switching the secondary battery supplying power to the secondary battery having the next terminal voltage.
When power is supplied from the secondary battery to the load by the selection circuit, if the load voltage drops below a specific voltage, the secondary battery currently supplying power to the load is changed to the secondary voltage of the next terminal voltage. The multi-battery power supply device according to claim 1, wherein the voltage lower than the specific voltage to be switched to the battery is a voltage of 85 to 90% of the rated voltage.
A plurality of rechargeable secondary batteries,
A charge switch that is intermittently provided between the plurality of secondary batteries and a solar panel for photoelectric conversion;
A resistance discharge circuit for discharging by connecting a resistance value to each of the plurality of secondary batteries;
A terminal voltage storage circuit for storing individual terminal voltages of the plurality of secondary batteries when any one of the switches operates;
A selection circuit that selects the secondary battery as a secondary battery that is charged from the solar panel in ascending order of the terminal voltage stored in the terminal voltage storage circuit when the charge switch is connected; A multi-battery power supply device.
The multi-battery power supply device according to any one of claims 1 to 3, wherein the plurality of secondary batteries are two secondary batteries.