JP6481199B2 - Power control apparatus, power control method, and power control system - Google Patents

Description

  The present disclosure relates to a power control device, a power control method, and a power control system.

  By providing a storage battery, there is an uninterruptible power supply that can continue to supply power from a storage battery to a connected device for a predetermined time without power failure even if the power from the input power supply is interrupted. It has been. A technology has been proposed in which such a power supply device is expanded to a consumer unit and power is supplied to the consumer when a power supply abnormality such as a power failure or a shortage of storage battery capacity occurs (see Patent Documents 1 and 2). .

JP 2011-208771 A JP 2013-90560 A

  In a power supply system for supplying DC power, when supplying DC power with three wires, a positive wire to which a positive potential is applied, a negative wire to which a negative potential is applied, and a neutral wire to which a ground potential is applied. There are a case where power is received by a positive line and a negative line, and a case where power is received by using a positive line or a negative line and a neutral line.

  However, in any case, when the storage battery is connected in series between the positive line and the neutral line and between the neutral line and the negative line to supply power, the power from one of the storage batteries When only the battery is consumed, there is a difference in the remaining amount between the storage batteries, and the power cannot be supplied effectively. In order to balance the power between the storage batteries, even if the storage batteries are connected in series and balanced, for example, in the case of a lithium ion battery, the output voltage is almost constant regardless of the amount of power, and the charging voltage with respect to the discharge voltage. Is so high that it cannot balance well.

  Therefore, in the present disclosure, the storage battery is connected in series between the positive electrode wire and the neutral wire, and between the neutral wire and the negative electrode wire, and the DC power is supplied by the positive electrode wire, the neutral wire, and the negative electrode wire. A new and improved power control device, power control method, and power control system capable of equalizing power between storage batteries when the battery is supplied are proposed.

  According to the present disclosure, a first battery provided between a positive line to which a positive potential is applied and a neutral line to which a ground potential is applied, and a negative line to which the neutral line and a negative potential are applied. An acquisition unit that acquires a charging status of the first battery and a charging status of the second battery from a second battery provided between the charging status, the charging status of the first battery acquired by the acquisition unit, and the second A power control unit that controls power interchange between the first battery and the second battery so that a state of charge of the battery is balanced, the power control unit through a bidirectional buck-boost chopper circuit There is also provided a power control device for controlling power interchange between the first battery and the second battery.

  According to the present disclosure, the charging state of the first battery provided between the positive line to which the positive potential is applied and the neutral line to which the ground potential is applied, and the neutral line and the negative potential are applied. Acquiring the charging status of the second battery provided between the negative electrode line and the charging status of the first battery and the charging status of the second battery based on the acquisition result. Thus, there is provided a power control method including controlling power interchange between the first battery and the second battery through a bidirectional buck-boost chopper circuit.

  According to the present disclosure, the first battery provided between the positive line to which a positive potential is applied and the neutral line to which the ground potential is applied, and the negative electrode to which the neutral line and a negative potential are applied. A second battery provided between the first battery and the second battery; an acquisition unit that acquires a charging status of the first battery and a charging status of the second battery from the first battery and the second battery; and A power control unit that controls power interchange between the first battery and the second battery so that the acquired charging state of the first battery and the charging state of the second battery are balanced, and The power control unit is provided with a power control system that controls power interchange between the first battery and the second battery through a bidirectional buck-boost chopper circuit.

  As described above, according to the present disclosure, the storage battery is connected in series between the positive electrode wire and the neutral wire, and between the neutral wire and the negative electrode wire, and the positive electrode wire, the neutral wire, and the negative electrode wire are connected. Provided are a new and improved power control device, power control method, and power control system capable of equalizing power between storage batteries when DC power is supplied by three wires.

  Note that the above effects are not necessarily limited, and any of the effects shown in the present specification, or other effects that can be grasped from the present specification, together with or in place of the above effects. May be played.

It is explanatory drawing which shows the structural example of the electric power control system which concerns on one Embodiment of this indication. FIG. 3 is an explanatory diagram illustrating a specific configuration example of a power control device according to an embodiment of the present disclosure. 6 is an explanatory diagram illustrating an example of hysteresis characteristics of a comparator. FIG. It is explanatory drawing for demonstrating operation | movement of a step-up / step-down chopper circuit. FIG. 5 is an explanatory diagram illustrating a specific circuit configuration example of the chopper circuit illustrated in FIG. 4. It is explanatory drawing which shows the relationship between the discharge voltage and charging voltage of a lithium ion battery with a graph. It is explanatory drawing which shows another structural example of the power control apparatus 100 which concerns on one Embodiment of this indication. 5 is a flowchart illustrating an operation example of the power control system 1 according to an embodiment of the present disclosure.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
1. One embodiment of the present disclosure 1.1. Outline 1.2. Configuration example 1.3. Example of operation Summary

<1. One Embodiment of the Present Disclosure>
[1.1. Overview]
Before describing an embodiment of the present disclosure, an outline of an embodiment of the present disclosure will be described.

  Each customer is equipped with a battery server with a storage battery, and power is stored in the storage battery using power generated by natural energy such as commercial power, solar power, wind power, geothermal heat, and the power stored in the storage battery is used. It is expected that mechanisms for operating electrical products will become increasingly popular in the future. Based on the spread of such a mechanism, as described above, when there is a shortage of power in a battery server of a certain consumer, the battery server of the consumer having a shortage of power from the battery server of the consumer with sufficient power. A system has been devised for accommodating power to a battery server. When power is supplied between consumers, it is desirable from the viewpoint of efficiency that supply with DC power is performed in consideration of power supply from storage batteries.

  There are various DC power supply methods, and among them, a DC three-wire power supply method in which DC power is transmitted through three wires of a positive electrode wire, a negative electrode wire, and a neutral wire has been studied. For example, a direct current three-wire power supply system in which a voltage of 100 V is applied to the positive line and a voltage of −100 V is applied to the negative line, and a voltage near 0 V is output by being grounded at somewhere on the neutral line is considered. .

  In such a power supply system that supplies DC power using the DC three-wire power supply system, when DC power is supplied through three wires, that is, a positive electrode wire, a negative electrode wire, and a neutral wire, power is supplied from the positive electrode wire and the negative electrode wire. There are cases where the electric power is received using a positive line or a negative line and a neutral line.

  However, in any case, when the storage battery is connected in series between the positive line and the neutral line and between the neutral line and the negative line to supply power, the power from one of the storage batteries When only the battery is consumed, there is a difference in remaining amount between the storage batteries, and each storage battery cannot effectively supply power.

  In any case, when the storage battery is connected in series between the positive electrode line and the neutral line and between the neutral line and the negative electrode line, each storage battery receives power and charges. When only one of the storage batteries is charged, a difference in the remaining amount occurs between the storage batteries, and each storage battery cannot be charged effectively. In order to balance the power between the batteries, even if each battery is connected in series to balance the power between the batteries, for example, in the case of a lithium ion battery, the output voltage is almost constant regardless of the amount of power, and the discharge Since the charging voltage is higher than the voltage, it is not possible to balance well.

  In order to balance the power between the storage batteries, a method may be considered in which a bidirectional DC / DC converter is used to boost and balance one of the voltages. However, in order to balance the power between the storage batteries connected in series, the step-up chopper cannot be connected as it is, and it is necessary to use an insulated DC / DC converter. However, an insulated DC / DC converter has many circuit components. Moreover, since there are many conversion losses, it is not efficient.

  Accordingly, the present disclosure person can balance the charge level between the storage batteries in the power supply system in which the storage battery is connected in series between the positive line and the neutral line and between the neutral line and the negative line. In addition, we conducted an intensive study on the realization of a power supply system incorporating a bidirectional buck-boost chopper. And this disclosure person can balance the charge level between storage batteries in the power supply system which connects a storage battery in series between a positive line and a neutral line, and between a neutral line and a negative line. As a result, a power supply system incorporating a bidirectional buck-boost chopper has been realized.

  Heretofore, an overview of an embodiment of the present disclosure has been described.

[1.2. Configuration example]
Subsequently, a configuration example of a power control device according to an embodiment of the present disclosure and a power control system including the power control device will be described.

  FIG. 1 is an explanatory diagram illustrating a configuration example of a power control system according to an embodiment of the present disclosure. Hereinafter, a configuration example of the power control system according to an embodiment of the present disclosure will be described with reference to FIG.

  As shown in FIG. 1, the power control system 1 according to an embodiment of the present disclosure includes battery devices 10a and 10b, a positive electrode wire 11, a neutral wire 12, a negative electrode wire 13, and devices 20a and 20b. 30 and the power control apparatus 100. Each of the devices 20a, 20b, and 30 may be a load that consumes power, or a generator that generates power. When the devices 20a, 20b, and 30 are generators that generate electric power, the generators may be generators that generate electricity using sunlight, wind, geothermal, wave power, or other natural energy.

  As shown in FIG. 1, the battery device 10 a is connected between the positive electrode wire 11 and the neutral wire 12. The battery device 10a supplies DC power to the device 20a through the positive electrode wire 11 and the neutral wire 12 (when the device 20a is a load), or receives supply of DC power from the device 20a (the device 20a is a generator). If so).

  As shown in FIG. 1, the battery device 10 b is connected between the neutral wire 12 and the negative electrode wire 13. The battery device 10b supplies DC power to the device 20b through the neutral wire 12 and the negative electrode wire 13 (when the device 20b is a load), or receives supply of DC power from the device 20b (the device 20b is a generator). If so).

  As shown in FIG. 1, the battery devices 10 a and 10 b are connected in series between the positive electrode wire 11 and the negative electrode wire 13. The battery devices 10a and 10b supply DC power to the device 30 through the positive electrode line 11 and the negative electrode wire 13 (when the device 30 is a load), or receive supply of DC power from the device 30 (the device 30 generates power). If it is a machine). The battery devices 10a and 10b are, for example, lithium ion batteries.

  It is desirable that the capacity of the battery device 10a and the capacity of the battery device 10b are equal or substantially equal. Each of the battery devices 10a and 10b outputs a charging state of the battery to the power control device 100. The state of charge of the battery may be a state of charge (SOC) of the battery. In addition, the battery devices 10a and 10b may transmit the charging state as an analog signal or a digital signal.

  The positive electrode wire 11 is an electric wire to which a positive potential is applied. The neutral wire 12 is an electric wire to which a ground potential is applied. The negative electrode wire 13 is an electric wire to which a negative potential is applied. The power control system 1 according to the embodiment of the present disclosure includes a device between the positive electrode wire 11 and the neutral wire 12, between the neutral wire 12 and the negative electrode wire 13, and between the positive electrode wire 11 and the negative electrode wire 13. By connecting to either of these, DC power can be supplied from the battery devices 10a and 10b, or DC power can be supplied to the battery devices 10a and 10b.

  The potential applied to the positive electrode line 11 may vary depending on the charging status of the battery device 10a. Similarly, the potential applied to the negative electrode line 13 may vary depending on the state of charge of the battery device 10b. In the present embodiment, the potential difference between the positive electrode wire 11 and the neutral wire 12 is set to 84V to 115V, and similarly, the potential difference between the neutral wire 12 and the negative electrode wire 13 is 84V to 115V. It shall be set as follows. Therefore, in this embodiment, the potential difference between the positive electrode line 11 and the negative electrode line 13 is set to be 168V to 230V.

  Therefore, the devices 20a and 20b connected between the positive electrode wire 11 and the neutral wire 12 and between the neutral wire 12 and the negative electrode wire 13 are designed to operate with a potential difference of 84V to 115V. It is desirable that the device 30 connected between the positive electrode line 11 and the negative electrode line 13 is designed to operate with a potential difference between 168V and 230V.

  When the power control system 1 is configured as described above, the battery device is connected when the device is connected between the positive line 11 and the neutral line 12 or between the neutral line 12 and the negative line 13. If the interchange of power between 10a and 10b is not taken into consideration, power is output only from one of the battery devices, or power is charged only to one of the battery devices, and the battery device 10a. 10b, the balance of the charging situation is lost.

  For example, even if the charging rate of the battery device 10b is 80% even if the charging rate of the battery device 10b is 0%, the device is connected to the positive electrode 11 and the middle of the battery device 10a, 10b. When connected to the sex wire 12, it becomes impossible to receive power supply from the battery device 10a.

  Further, for example, if the charging rate of the battery device 10a is 0% and the battery device 10a is desired to be charged, if the generator is connected between the neutral wire 12 and the negative electrode wire 13, the battery device 10a I cannot charge the battery. In this case, for example, if the charging rate of the battery device 10b is 100%, the battery device 10b cannot be charged if the generator is connected between the neutral wire 12 and the negative electrode wire 13.

  Therefore, the power control system 1 according to an embodiment of the present disclosure includes a power control device 100 that is connected to the positive electrode wire 11, the neutral wire 12, and the negative electrode wire 13. The power control device 100 according to an embodiment of the present disclosure balances the balance of the charging status between the battery devices 10a and 10b.

  Although a specific configuration and operation of the power control apparatus 100 according to an embodiment of the present disclosure will be described later, the operation will be briefly described. The power control apparatus 100 according to an embodiment of the present disclosure acquires a battery charging state from the battery apparatuses 10a and 10b. And the power control apparatus 100 which concerns on one Embodiment of this indication controls the interchange of the electric power between battery apparatus 10a, 10b in the direction in which a charging condition is equalized based on the acquired charging condition.

  For example, as a result of the power control device 100 acquiring the charging status, if it is found that the charging rate of the battery device 10a is 40% and the charging rate of the battery device 10b is 60%, the power control device 100 Control is performed so as to allow power to be exchanged from the battery device 10b to the battery device 10b, and the balance of the charging state between the battery devices 10a and 10b is balanced.

  The power control apparatus 100 according to an embodiment of the present disclosure balances the state of charge between the battery apparatuses 10a and 10b, so that how the device performs the positive line 11, the neutral line 12, or the negative line. 13, the connected device can receive power from the battery devices 10a and 10b, and the device can transmit power to the battery devices 10a and 10b.

  The power control apparatus 100 according to an embodiment of the present disclosure controls interchange of power between the battery devices 10a and 10b using a bidirectional buck-boost chopper circuit. The step-up / step-down chopper circuit is a chopper circuit capable of both stepping up and stepping down, and is a chopper circuit configured to be able to step up and step down depending on a duty ratio (time during which the MOSFET passes current). The power control apparatus 100 according to an embodiment of the present disclosure uses a bidirectional buck-boost chopper circuit to control bidirectional interchange of power between the battery devices 10a and 10b instead of one direction. It is what you are trying.

  The battery devices 10a and 10b have characteristics that the charging voltage is higher than the discharging voltage. Therefore, the power control device 100 enables effective power interchange between the battery devices 10a and 10b by boosting the discharge voltage to around the charging voltage when power is interchanged between the battery devices 10a and 10b. To do.

  The configuration example of the power control system according to the embodiment of the present disclosure has been described above using FIG. Next, a specific configuration example of the power control apparatus according to an embodiment of the present disclosure will be described.

  FIG. 2 is an explanatory diagram illustrating a specific configuration example of the power control device according to the embodiment of the present disclosure. Hereinafter, a specific configuration example of the power control apparatus according to an embodiment of the present disclosure will be described with reference to FIG.

  As shown in FIG. 2, the power control apparatus 100 according to an embodiment of the present disclosure includes a control circuit 110, a comparator 120, MOSFETs T1 and T2, capacitors C1 and C2, and a coil L1. Composed.

  The control circuit 110 applies a voltage from the g1 terminal or the g2 terminal to the gate terminals of the MOSFETs T1 and T2 to control the time during which the MOSFETs T1 and T2 are turned on, so that power can be exchanged between the battery devices 10a and 10b. Is a circuit for controlling The control circuit 110 determines MOSFETs T1 and T2 that apply a voltage from the g1 terminal or the g2 terminal to the gate terminal based on the comparison result of the charging rates of the battery devices 10a and 10b by the comparator 120. The control circuit 110 can function as an example of the power control unit of the present disclosure.

  The control circuit 110 monitors the highest charging voltage of the battery device 10a at the Va terminal and the lowest discharging voltage of the battery device 10b at the Vb terminal while power is being transmitted between the battery devices 10a and 10b. When the maximum charging voltage of the battery device 10a or the minimum discharging voltage of the battery device 10b becomes an abnormal voltage, the control circuit 110 stops power conversion. When the maximum charge voltage of the battery device 10a or the minimum discharge voltage of the battery device 10b becomes an abnormal voltage, the control circuit 110 can protect the battery devices 10a and 10b by stopping the power conversion.

  The control circuit 110 may have a function of limiting the amount of current to be converted based on the output value from the comparator 120, and increases the voltage on the output side until the amount of current reaches the limit value. The value can be set so as not to exceed the maximum charging voltage of the battery devices 10a, 10b. In addition, the control circuit 110 can limit the power supply between the battery devices 10a and 10b so as not to fall below the minimum discharge voltage of the battery devices 10a and 10b on the input side.

  The control circuit 110 inputs the voltage of the coil L1 from the e terminal in order to protect the overcurrent of the battery devices 10a and 10b. The control circuit 110 monitors the voltage of the coil L1 input from the e terminal and the voltages of the Va terminal and the Vb terminal, so that the current flowing through the battery devices 10a and 10b does not become an overcurrent. Controls the duty ratio of the signal output to the gate terminal.

  When the voltage is applied to the gate terminal to turn on the MOSFETs T1 and T2, the control circuit 110 outputs the voltage to the MOSFETs T1 and T2 so that the voltage is applied to the gate terminal with a predetermined duty ratio. In other words, the control circuit 110 outputs a voltage to the MOSFETs T1 and T2 so that the MOSFETs T1 and T2 pass current at a predetermined duty ratio.

  The comparator 120 acquires the charging status of the battery from the battery devices 10a and 10b, and compares the charging status of the battery devices 10a and 10b. Then, as a result of the comparison of the charging status of the battery devices 10a and 10b, the comparator 120 sends an instruction for power interchange between the battery devices 10a and 10b to the dir terminal of the control circuit 110. Accordingly, the comparator 120 can function as an acquisition unit and a comparison unit of the present disclosure. The power control device 100 shown in FIG. 2 turns on the MOSFETs T1 and T2 with a predetermined duty ratio in accordance with the output of the comparator 120, and the battery device 10a or 10b has a lower charge rate from the higher charge rate. Accommodate electricity to

  It is desirable that the comparator 120 has a predetermined hysteresis. By setting the predetermined hysteresis in the comparator 120, the power control device 100 according to the embodiment of the present disclosure can prevent frequent switching of power interchange between the battery devices 10a and 10b.

  FIG. 3 is an explanatory diagram illustrating an example of the hysteresis characteristic of the comparator 120. For example, assuming that the charging rate of the battery device 10a is greater than the charging rate of the battery device 10b, the comparator 120 outputs an output if the difference between the charging rate of the battery device 10a and the charging rate of the battery device 10b is within a predetermined value. When the difference between the charging rate of the battery device 10a and the charging rate of the battery device 10b exceeds a predetermined value, a value proportional to the difference is output.

  The power control device 100 illustrated in FIG. 2 is configured to compare the charging status of the battery devices 10a and 10b with the comparator 120 and output the comparison result as an analog signal. The comparison of the charging status of 10a and 10b is not limited to the comparator 120. Instead of the comparator 120, for example, a circuit that compares the charging states of the battery devices 10a and 10b and outputs the comparison result as a digital signal may be provided in the power control device 100.

  The MOSFETs T1 and T2, the capacitors C1 and C2, and the coil L1 constitute a bidirectional step-up / step-down chopper circuit. Specifically, when a voltage is applied to the gate terminal from the control circuit 110, the MOSFET T1 is turned on at a predetermined duty ratio, and when the MOSFET T2 is turned off, the MOSFET T1, the diode component D2 of the MOSFET T2, The step-up / step-down chopper circuit is configured by the coil L1 and the capacitor C2. The MOSFET T1, the diode component D2 of the MOSFET T2, the coil L1, and the capacitor C2 constitute a step-up / step-down chopper circuit, so that power can be sent from the battery device 10a to the battery device 10b.

  Similarly, when a voltage is applied to the gate terminal from the control circuit 110 to turn on the MOSFET T2 at a predetermined duty ratio and the MOSFET T1 is turned off, the MOSFET T2, the diode component D1 of the MOSFET T1, and the coil L1. The capacitor C1 constitutes a step-up / down chopper circuit. The step-up / step-down chopper circuit is configured by the MOSFET T2, the diode component D1 of the MOSFET T1, the coil L1, and the capacitor C1, so that electric power can be transmitted from the battery device 10b to the battery device 10a. That is, the power control apparatus 100 according to an embodiment of the present disclosure uses the bidirectional buck-boost chopper circuit that can change the power transmission direction by changing the MOSFET to be turned on. The interchange of the electric power between 10b is enabled.

  Here, the operation of the step-up / step-down chopper circuit will be described. FIG. 4 is an explanatory diagram for explaining the operation of the step-up / step-down chopper circuit.

  As described above, the step-up / step-down chopper circuit is a chopper circuit capable of both stepping up and stepping down, and is configured to be able to step up and step down depending on the duty ratio (time during which the MOSFET passes current). Circuit.

In the chopper circuit shown in FIG. 4, an inductor L and a capacitor C are connected in parallel. The chopper circuit shown in FIG. 4, the switch SW is provided with a connection destination of the inductor L is selected to one of the DC power supply V _in or load V _out.

For chopper circuit shown in FIG. 4, taking the percentage of time by controlling the switch SW between the inductor L and the DC power supply _{V in} is connected greater than _50%, V _{in> V out} becomes, therefore, FIG. The chopper circuit 4 is boosted. Conversely, the chopper circuit shown in FIG. 4, taking the percentage of time by controlling the switch SW between the inductor L and the DC power supply _{V in} is connected less than _50%, V in _{<V out} becomes, Therefore, the chopper circuit of FIG.

FIG. 5 is an explanatory diagram showing a specific circuit configuration example of the chopper circuit shown in FIG. Chopper circuit shown in FIG. 5, the MOSFET T on a path from the DC power supply _{V in} the load _{V out,} and a diode D, is provided.

In the chopper circuit shown in FIG. 5, for example, if the MOSFET T is turned on for 80% of time, the energy of the inductor L is transmitted to the load _Vout via the diode D for the remaining 20% of time. It will be. Therefore, when the MOSFET T is turned on only for 80% of the time, V _out = 4V _in .

On the other hand, in the chopper circuit shown in FIG. 5, for example, if the MOSFET T is turned on for 20% of time, the energy of the inductor L is transferred to the load V _out via the diode D for the remaining 80% of time. Will be communicated. Therefore, when the MOSFET T is turned on only for 20% of the time, V _out = V _in / 4.

  As described above, the step-up / step-down chopper circuit is configured so that the step-up operation and the step-down operation can be performed by changing the time during which the MOSFET T is turned on. Then, the power control apparatus 100 according to the present embodiment configures a bidirectional buck-boost chopper circuit using the mechanism of this buck-boost chopper circuit, and the battery device 10a via the bidirectional buck-boost chopper circuit. The interchange of electric power in both directions between 10b is performed.

  That is, the bidirectional buck-boost chopper circuit in the power control apparatus 100 shown in FIG. 2 is realized by inverting the buck-boost chopper circuit shown in FIG. 5 around the inductor L and connecting them in series. Can do. The power control apparatus 100 according to the present embodiment is characterized in that bidirectional power interchange is performed between the battery devices 10a and 10b using a bidirectional buck-boost chopper circuit.

  As described above, the power control device 100 according to the present embodiment performs power interchange between the battery devices 10a and 10b using the bidirectional buck-boost chopper circuit mechanism in the lithium ion battery. This is because the charge voltage is higher than the discharge voltage. FIG. 6 is an explanatory diagram illustrating the relationship between the discharge voltage and the charge voltage of the lithium ion battery. In the graph shown in FIG. 6, the horizontal axis represents SOC and the vertical axis represents voltage. As shown in FIG. 6, it can be seen that the charge voltage of the lithium ion battery is higher than the discharge voltage in any SOC.

  Therefore, in order to efficiently exchange power between the battery devices 10a and 10b, the power control device 100 according to the present embodiment charges the discharge voltage using the mechanism of the bidirectional buck-boost chopper circuit. The MOSFETs T1 and T2 are turned on at a duty ratio that can be increased to a voltage.

  FIG. 2 shows an example in which a bidirectional buck-boost chopper circuit is configured by a MOSFET, but the present disclosure is not limited to such an example. A bidirectional buck-boost chopper circuit may be configured using a bipolar transistor and a diode.

  FIG. 7 is an explanatory diagram illustrating another configuration example of the power control apparatus 100 according to an embodiment of the present disclosure. FIG. 7 shows a configuration example of the power control apparatus 100 when a bidirectional buck-boost chopper circuit is configured using the bipolar transistors T11 and T12 and the diodes D1 and D2.

  When a voltage is applied to the gate terminal from the control circuit 110, the bipolar transistor T11 is turned on at a predetermined duty ratio, and when the bipolar transistor T12 is turned off, the bipolar transistor T11, the diode D2, the coil L1, and the capacitor C2 The step-up / step-down chopper circuit is configured.

  Similarly, when a voltage is applied to the gate terminal from the control circuit 110, the bipolar transistor T12 is turned on at a predetermined duty ratio, and when the bipolar transistor T11 is turned off, the bipolar transistor T12, the diode D1, and the coil L1 The capacitor C1 constitutes a step-up / step-down chopper circuit.

  As shown in FIG. 7, the power control apparatus 100 can form a bidirectional buck-boost chopper circuit even when the bipolar transistors T11 and T12 and the diodes D1 and D2 are used.

  Heretofore, the configuration example of the power control apparatus 100 according to an embodiment of the present disclosure has been described. Subsequently, an operation example of the power control system 1 according to an embodiment of the present disclosure will be described.

[1.3. Example of operation]
FIG. 8 is a flowchart illustrating an operation example of the power control system 1 according to an embodiment of the present disclosure. The flowchart shown in FIG. 8 is an operation example of the power control system according to an embodiment of the present disclosure when performing power interchange between the battery devices 10a and 10b based on the charging status of the battery devices 10a and 10b. . Hereinafter, an operation example of the power control system 1 according to an embodiment of the present disclosure will be described with reference to FIG.

  When performing power interchange between the battery devices 10a and 10b, the power control system 1 first acquires and compares the SOCs of the battery devices 10a and 10b (step S101). For example, the comparator 120 executes the acquisition and comparison of the SOCs of the battery devices 10a and 10b in step S101.

  Subsequently, as a result of the comparison in step S101, the power control system 1 determines whether or not the SOC difference between the battery devices 10a and 10b exceeds a predetermined amount (step S102). Whether the difference between the SOCs of the battery devices 10a and 10b exceeds a predetermined amount is determined by the comparator 120 if the comparator 120 has hysteresis.

  As a result of the determination in step S102, if the difference between the SOCs of the battery devices 10a and 10b is equal to or less than the predetermined amount (No in step S102), the power control system 1 returns to the process in step S101.

  On the other hand, as a result of the determination in step S102, if the difference between the SOCs of the battery devices 10a and 10b exceeds a predetermined amount (step S102, Yes), the power control system 1 changes the battery device 10a from the higher to the lower SOC. 10b, power interchange is performed (step S103). The power interchange in step S103 is executed by the control circuit 110.

  When the power control system 1 performs power interchange between the battery devices 10a and 10b from the higher SOC to the lower SOC, as described above, the control circuit 110 is connected to one of the gate terminals of the MOSFETs T1 and T2. A voltage is applied at a duty ratio of% or more to boost the discharge voltage to the charge voltage. As described above, in the case of a lithium ion battery, the values of the charging voltage and the discharging voltage can change depending on the SOC. Therefore, the control circuit 110 may change the time for applying a voltage to the gate terminal of either of the MOSFETs T1 and T2 according to the SOC of the battery devices 10a and 10b.

  When the process of step S103 ends, the power control system 1 returns to the process of step S101 again.

  The power control system 1 repeatedly executes the series of processes in FIG. 8 while the power control system 1 is operating. Note that the acquisition and comparison processing in step S101 can be executed at predetermined intervals.

  The power control system 1 according to an embodiment of the present disclosure can balance the state of charge between the battery devices 10a and 10b by executing a series of processes as illustrated in FIG. Thus, the battery devices 10a and 10b can be used efficiently.

<2. Summary>
As described above, according to the embodiment of the present disclosure, when the battery devices 10a and 10b are connected in series between the positive line and the neutral line and between the neutral line and the negative line, the battery A power control device 100 and a power control device 100 are provided that compare the charging statuses of the devices 10a and 10b and allow power to be interchanged between the battery devices 10a and 10b so that the charging statuses of the battery devices 10a and 10b are balanced. A power control system 1 is provided.

  The power control apparatus 100 according to an embodiment of the present disclosure acquires and compares the charging statuses of the battery devices 10a and 10b, and in the direction in which the charging statuses of the battery devices 10a and 10b are equalized between the battery devices 10a and 10b. Make power available. The power control device 100 according to the embodiment of the present disclosure allows the power of the battery devices 10a and 10b to be equalized so that the charging status of the battery devices 10a and 10b is equalized. Good use can be made possible.

  Moreover, the power control apparatus 100 according to an embodiment of the present disclosure uses a bidirectional buck-boost chopper circuit to allow power to be interchanged between the battery apparatuses 10a and 10b. The power control apparatus 100 according to the embodiment of the present disclosure allows the power control apparatus 100 according to the embodiment of the present disclosure to charge the battery apparatuses 10a and 10b by using the bidirectional buck-boost chopper circuit to interchange power between the battery apparatuses 10a and 10b. When the electric power is interchanged between the battery devices 10a and 10b in the direction in which the battery voltage is equalized, the discharge voltage is increased to be equal to or higher than the charging voltage, thereby enabling efficient electric power interchange.

  The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

  For example, in the above embodiment, in the power control apparatus 100, the comparator 120 acquires and compares the charging states of the battery devices 10a and 10b, and compares the charging states of the battery devices 10a and 10b with the battery devices 10a and 10b. However, the present disclosure is not limited to such an example.

  As shown in FIG. 6, it can be seen that the charge voltage of the lithium ion battery is higher than the discharge voltage in any SOC. However, depending on the battery used for the battery devices 10a and 10b, the discharge voltage at the time of high SOC may be higher than the charge voltage at the time of low SOC. When such a battery is used for the battery devices 10a and 10b, there is a case where it is not necessary to boost the discharge voltage to the charge voltage by the bidirectional chopper circuit.

  Therefore, the power control device 100 acquires the charging status of the battery devices 10a and 10b, and charges the discharge voltage with the bidirectional chopper circuit when power is exchanged between the battery devices 10a and 10b according to the charging status. It may be determined whether to boost the voltage.

  For example, when the power control device 100 acquires the charging status of the battery devices 10a and 10b and decides to exchange power from the battery device 10a to the battery device 10b, the discharge voltage of the battery device 10a is changed to the charging voltage of the battery device 10b. If there is a charge situation that does not need to be boosted to

  Further, the effects described in the present specification are merely illustrative or exemplary and are not limited. That is, the technology according to the present disclosure can exhibit other effects that are apparent to those skilled in the art from the description of the present specification in addition to or instead of the above effects.

The following configurations also belong to the technical scope of the present disclosure.
(1)
A first battery provided between a positive line to which a positive potential is applied and a neutral line to which a ground potential is applied, and a first battery provided between the neutral line and a negative line to which a negative potential is applied. An acquisition unit that acquires the charging status of the first battery and the charging status of the second battery from two batteries;
A power control unit that controls power interchange between the first battery and the second battery so that the charging status of the first battery and the charging status of the second battery acquired by the acquisition unit are balanced;
With
The power control unit is a power control device that controls power interchange between the first battery and the second battery through a bidirectional buck-boost chopper circuit.
(2)
The buck-boost chopper circuit is
A first transistor provided between the positive electrode line and the neutral line;
A first capacitor provided between the positive electrode line and the neutral line and provided in parallel with the first transistor;
A second transistor provided between the neutral wire and the negative electrode wire;
A second capacitor provided between the neutral line and the negative electrode line and provided in parallel with the second transistor;
An inductor provided in the neutral wire;
The power control device according to (1), including:
(3)
The power control unit is a time for bringing either the first transistor or the second transistor into a conductive state based on the charging state of the first battery and the charging state of the second battery acquired by the acquisition unit. The power control device according to (2), wherein:
(4)
The power control device according to (3), wherein the power control unit causes either the first transistor or the second transistor to be in a conductive state in a time exceeding 50%.
(5)
The power control unit obtains and compares the charging status of the first battery and the charging status of the second battery, and as a result, accommodates power from a battery with a large charging rate to a small battery, (1) to (1) 4) The power control apparatus according to any one of the above.
(6)
The first battery and the second battery receive power from a generator connected between the positive line and the neutral line or between the neutral line and the negative line, (1 The power control apparatus according to any one of (5) to (5).
(7)
The first battery and the second battery supply electric power to a load connected between the positive line and the neutral line or between the neutral line and the negative line, (1) The power control device according to any one of to (6).
(8)
The power control device according to any one of (1) to (7), wherein the acquisition unit includes a comparison unit that compares the acquired charging state of the first battery and the charging state of the second battery.
(9)
The power control apparatus according to (8), wherein the comparison unit has a predetermined hysteresis when comparing a charging state of the first battery and a charging state of the second battery.
(10)
The power control device according to (8) or (9), wherein the output of the comparison unit is an analog output.
(11)
The power control apparatus according to (8) or (9), wherein an output of the comparison unit is a digital output.
(12)
The power control apparatus according to any one of (8) to (11), wherein the comparison unit compares a charging rate of the first battery with a charging rate of the second battery.
(13)
The power control unit according to any one of (1) to (12), wherein the power control unit limits a maximum value of an output current when power is accommodated.
(14)
The power control unit according to any one of (1) to (13), wherein the power control unit sets a maximum value of an output voltage at the time of power accommodation as a maximum charging voltage of the first battery and the second battery. apparatus.
(15)
Between the state of charge of the first battery provided between a positive line to which a positive potential is applied and a neutral line to which a ground potential is applied, and between the neutral line and a negative line to which a negative potential is applied Obtaining the charging status of the second battery provided in
Between the first battery and the second battery through a bidirectional buck-boost chopper circuit so that the charging state of the first battery and the charging state of the second battery are balanced based on the result of the acquisition. Controlling power interchange,
A power control method.
(16)
A first battery provided between a positive line to which a positive potential is applied and a neutral line to which a ground potential is applied;
A second battery provided between the neutral line and a negative line to which a negative potential is applied;
An acquisition unit that acquires the charging status of the first battery and the charging status of the second battery from the first battery and the second battery;
A power control unit that controls power interchange between the first battery and the second battery so that the charging status of the first battery and the charging status of the second battery acquired by the acquisition unit are balanced;
With
The power control unit is a power control system that controls power interchange between the first battery and the second battery through a bidirectional buck-boost chopper circuit.

1: Power control system 3: DC 10a: Battery device 10b: Battery device 11: Positive line 12: Neutral line 13: Negative line 20a: Device 20b: Device 30: Device 100: Power control device 110: Control circuit 120: Comparator

Claims (13)

A first battery, which is a lithium ion battery, provided between a positive line to which a positive potential is applied and a neutral line to which a ground potential is applied, and a neutral line and a negative line to which a negative potential is applied An acquisition unit that acquires a charging status of the first battery and a charging status of the second battery from a second battery that is a lithium ion battery provided therebetween,
A power control unit that controls power interchange between the first battery and the second battery so that the charging status of the first battery and the charging status of the second battery acquired by the acquisition unit are balanced;
With
The power control unit controls power interchange between the first battery and the second battery through a bidirectional buck-boost chopper circuit;
The buck-boost chopper circuit is
A first transistor provided between the positive electrode line and the neutral line;
A first capacitor provided between the positive electrode line and the neutral line and provided in parallel with the first transistor;
A second transistor provided between the neutral wire and the negative electrode wire;
A second capacitor provided between the neutral line and the negative electrode line and provided in parallel with the second transistor;
An inductor provided in the neutral wire;
Including
The power control unit exceeds 50% of either the first transistor or the second transistor based on the charging status of the first battery and the charging status of the second battery acquired by the acquisition unit. A power control device that makes it conductive in time.   2. The power control unit according to claim 1, wherein, as a result of acquiring and comparing the charging status of the first battery and the charging status of the second battery, the power control unit accommodates power from a battery having a large charging rate to a small battery. Power control device.   The first battery and the second battery receive power from a generator connected between the positive line and the neutral line or between the neutral line and the negative line. Or the electric power control apparatus of 2.   The first battery and the second battery supply electric power to a load connected between the positive line and the neutral line or between the neutral line and the negative line. 4. The power control apparatus according to any one of 3.   The power control apparatus according to claim 1, wherein the acquisition unit includes a comparison unit that compares the acquired charging state of the first battery and the charging state of the second battery.   The power control apparatus according to claim 5, wherein the comparison unit has a predetermined hysteresis when comparing a charging state of the first battery and a charging state of the second battery.   The power control apparatus according to claim 5, wherein the output of the comparison unit is an analog output.   The power control apparatus according to claim 5 or 6, wherein the output of the comparison unit is a digital output.   The power control device according to any one of claims 5 to 8, wherein the comparison unit compares a charging rate of the first battery with a charging rate of the second battery.   The power control device according to claim 1, wherein the power control unit limits a maximum value of an output current at the time of power accommodation.   The power control device according to any one of claims 1 to 10, wherein the power control unit sets a maximum value of an output voltage when power is accommodated as a maximum charging voltage of the first battery and the second battery. The charging state of the first battery, which is a lithium ion battery provided between the positive line to which a positive potential is applied and the neutral line to which a ground potential is applied, and the neutral line and a negative potential are applied. Obtaining a charging status of a second battery which is a lithium ion battery provided between the negative electrode line;
Between the first battery and the second battery through a bidirectional buck-boost chopper circuit so that the charging state of the first battery and the charging state of the second battery are balanced based on the result of the acquisition. Controlling power interchange,
Including
The buck-boost chopper circuit is
A first transistor provided between the positive electrode line and the neutral line;
A first capacitor provided between the positive electrode line and the neutral line and provided in parallel with the first transistor;
A second transistor provided between the neutral wire and the negative electrode wire;
A second capacitor provided between the neutral line and the negative electrode line and provided in parallel with the second transistor;
An inductor provided in the neutral wire;
Including
Controlling the power interchange is a time exceeding 50% of either the first transistor or the second transistor based on the acquired charging state of the first battery and the charging state of the second battery. A power control method in which the power is turned on. A first battery that is a lithium ion battery provided between a positive line to which a positive potential is applied and a neutral line to which a ground potential is applied;
A second battery that is a lithium ion battery provided between the neutral wire and a negative electrode wire to which a negative potential is applied;
An acquisition unit that acquires the charging status of the first battery and the charging status of the second battery from the first battery and the second battery;
A power control unit that controls power interchange between the first battery and the second battery so that the charging status of the first battery and the charging status of the second battery acquired by the acquisition unit are balanced;
With
The power control unit controls power interchange between the first battery and the second battery through a bidirectional buck-boost chopper circuit;
The buck-boost chopper circuit is
A first transistor provided between the positive electrode line and the neutral line;
A first capacitor provided between the positive electrode line and the neutral line and provided in parallel with the first transistor;
A second transistor provided between the neutral wire and the negative electrode wire;
A second capacitor provided between the neutral line and the negative electrode line and provided in parallel with the second transistor;
An inductor provided in the neutral wire;
Including
The power control unit exceeds 50% of either the first transistor or the second transistor based on the charging status of the first battery and the charging status of the second battery acquired by the acquisition unit. A power control system that keeps conducting in time.

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