Power supply

Abstract

To provide a power supply device capable of coping with a plurality of chargers without interrupting operation of a load.SOLUTION: A first negative electrode side battery terminal is connected to a second positive electrode side battery terminal; a first switch is connected between a first positive electrode side battery terminal and a positive electrode side input terminal; a second switch is connected between a first connection point between the first negative electrode side battery terminal and the second positive electrode side battery terminal, and the positive electrode side input terminal; a third switch is connected between a second connection point between the first negative electrode side battery terminal and the second positive electrode side battery terminal, and the negative electrode side input terminal; a fourth switch is connected between the second negative electrode side battery terminal, and the negative electrode side input terminal; a positive electrode side output terminal is connected to a line connecting the first switch and the first positive electrode side battery terminal; and the negative electrode side output terminal is connected to a line connecting the negative electrode side input terminal and the second negative electrode side battery terminal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply device. [Background technology]

[0002] As electric vehicles (EVs) and plug-in hybrid electric vehicles (Plug-in Hybrid Electric Vehicles) become widespread, charging equipment capable of charging the batteries of these electric vehicles is also becoming widespread. Currently installed charging equipment meets a variety of standards, and the power supply device of an electric vehicle needs to be compatible with charging devices of multiple standards. For example, Patent Document 1 discloses a power supply device that can be compatible with both a quick charger and an ultra-quick charger that supplies a higher voltage of power than a quick charger by switching the connection of two batteries between parallel and series. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-150784 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the power supply device disclosed in Patent Document 1, when the connection of the two batteries is switched, the voltage applied to the load changes significantly. Therefore, in the power supply device disclosed in Patent Document 1, the load cannot be operated while the connection of the two batteries is being switched.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a power supply device that can accommodate a plurality of chargers without interrupting the operation of the load. [Means for solving the problem]

[0006] In order to solve the above problems, a power supply device according to one embodiment of the present invention has a first positive battery terminal and a first negative battery terminal for connecting a battery, a second positive battery terminal and a second negative battery terminal for connecting a battery, a positive input terminal and a negative input terminal for connecting a charger, a positive output terminal and a negative output terminal for connecting a load, a first switch, a second switch, a third switch, and a fourth switch, wherein the first negative battery terminal is connected to the second positive battery terminal, and the first switch is connected between the first positive battery terminal and the positive input terminal. the second switch is connected between a first connection point between the first negative battery terminal and the second positive battery terminal and the positive input terminal, the third switch is connected between a second connection point between the first negative battery terminal and the second positive battery terminal and the negative input terminal, the fourth switch is connected between the second negative battery terminal and the negative input terminal, the positive output terminal is connected to a line connecting the first switch and the first positive battery terminal, and the negative output terminal is connected to a line connecting the negative input terminal and the second negative battery terminal. Effect of the Invention

[0007] According to the present invention, it is possible to provide a power supply device that can accommodate a plurality of chargers without interrupting the operation of the load. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a power supply device 100 according to an embodiment of the present invention. [Diagram 2] 2 is a diagram illustrating the flow of power in a power supply device 100. FIG. [Diagram 3] 2 is a diagram illustrating the flow of power in a power supply device 100. FIG. [Figure 4] 2 is a diagram illustrating the flow of power in a power supply device 100. FIG. [Diagram 5]2 is a diagram illustrating the flow of power in a power supply device 100. FIG. [Figure 6] FIG. 2 is a diagram illustrating charging of a first battery 210 and a second battery 220. [Figure 7] FIG. 2 is a diagram illustrating charging of a first battery 210 and a second battery 220. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Power supply device 100> 1 is a diagram showing a power supply device 100 according to an embodiment of the present invention. The power supply device 100 has a first positive battery terminal 111, a first negative battery terminal 112, a second positive battery terminal 121, a second negative battery terminal 122, a positive input terminal 131, a negative input terminal 132, a first switch SW1, a second switch SW2, a third switch SW3, a fourth switch SW4, a positive output terminal 141, and a negative output terminal 142.

[0010] The first positive battery terminal 111 and the first negative battery terminal 112 are terminals for connecting the first battery 210, the positive electrode of the first battery 210 is connected to the first positive terminal 111, and the negative electrode of the first battery 210 is connected to the first negative battery terminal 112. The second positive battery terminal 121 and the second negative battery terminal 122 are terminals for connecting the second battery 220, the positive electrode of the second battery 220 is connected to the second positive terminal 121, and the negative electrode of the second battery 220 is connected to the second negative battery terminal 122. The first battery 210 and the second battery 220 are storage batteries capable of charging and discharging power, for example, lithium ion batteries. The driving voltages of the first battery and the second battery 220 are the same, which is a first voltage (for example, 400V).

[0011] In this embodiment, the first negative battery terminal 112 is connected to the second positive battery terminal 121. Therefore, in this embodiment, the first battery 210 and the second battery 220 are connected in series.

[0012] The positive input terminal 131 and the negative input terminal 132 are terminals for connecting the charger 300. When a first charger 300A (e.g., a rapid charger) that supplies power of a second voltage (e.g., 400V or 500V) that is equal to or higher than the first voltage and lower than twice the voltage of the first voltage is connected to the positive input terminal 131 and the negative input terminal 132, power of the second voltage is input from the positive input terminal 131 and the negative input terminal 132. When a second charger 300B (e.g., an ultra-rapid charger) that supplies power of a third voltage (e.g., 800V or 1000V) that is equal to or higher than twice the voltage of the first voltage is connected to the positive input terminal 131 and the negative input terminal 132, power of the third voltage is input from the positive input terminal 131 and the negative input terminal 132.

[0013] In this embodiment, the first switch SW1 is connected between the first positive battery terminal 111 and the positive input terminal 131. The second switch SW2 is connected between the first connection point CP1 between the first negative battery terminal 112 and the second positive battery terminal 121 and the positive input terminal 131. The third switch SW3 is connected between the second connection point CP2 between the first negative battery terminal 112 and the second positive battery terminal 121 and the negative input terminal 132. The fourth switch SW4 is connected between the second negative battery terminal 122 and the negative input terminal 132.

[0014] Therefore, in this embodiment, in a state where the first switch SW1 and the fourth switch SW4 are closed and the second switch SW2 and the third switch SW3 are open, the first battery 210 and the second battery 220 are connected in series between the positive electrode side input terminal 131 and the negative electrode side input terminal 132 as shown in Fig. 2. Therefore, in a state where the first switch SW1 and the fourth switch SW4 are closed and the second switch SW2 and the third switch SW3 are open as shown in Fig. 2, when a charger is connected to the positive electrode side input terminal 131 and the negative electrode side input terminal 132, it is possible to charge the first battery 210 and the second battery 220 connected in series.

[0015] Therefore, in this embodiment, when the second charger 300B (for example, an ultra-fast charger) is connected to the positive input terminal 131 and the negative input terminal 132, the first switch SW1 and the fourth switch SW4 are closed, and the second switch SW2 and the third switch SW3 are opened to charge the first battery 210 and the second battery 220 in series. In this manner, in this embodiment, it becomes possible to charge each of the first battery 210 and the second battery 220 with power of a voltage equal to or lower than half of the third voltage, that is, with power of a voltage according to the first voltage which is the drive voltage of the first battery 210 and the second battery 220.

[0016] In this embodiment, in a state (first state) in which the first switch SW1 and the third switch SW3 are closed and the second switch SW2 and the fourth switch SW4 are open, the positive electrode of the first battery 210 is connected to the positive electrode side input terminal 131, and the negative electrode of the first battery 210 is connected to the negative electrode side input terminal 132, as shown in Fig. 3. Therefore, in this first state, when a charger 300 is connected to the positive electrode side input terminal 131 and the negative electrode side input terminal 132, it becomes possible to charge the first battery 210 by the charger 300, as shown in Fig. 3.

[0017] Therefore, in this embodiment, when the first charger 300A (for example, a quick charger) is connected to the positive input terminal 131 and the negative input terminal 132, the first switch SW1 and the third switch SW3 are closed, the second switch SW2 and the fourth switch SW4 are opened, the first to fourth switches SW1 to SW4 are set to the first state, and the first battery 210 is charged. In this manner, in this embodiment, it becomes possible to charge the first battery 210 with power of the second voltage, that is, with power of a voltage according to the first voltage which is the drive voltage of the first battery 210.

[0018] In this embodiment, in a state where the second switch SW2 and the fourth switch SW4 are closed and the first switch SW1 and the third switch SW3 are open (second state), the positive electrode of the second battery 220 is connected to the positive electrode side input terminal 131, and the negative electrode of the second battery 220 is connected between the positive electrode side input terminal 131 and the negative electrode side input terminal 132, as shown in Fig. 4. Therefore, in the second state, as shown in Fig. 4, when a charger 300 is connected to the positive electrode side input terminal 131 and the negative electrode side input terminal 132, the second battery 220 can be charged by the charger 300.

[0019] Therefore, in this embodiment, when the first charger 300A (for example, a quick charger) is connected to the positive input terminal 131 and the negative input terminal 132, the second switch SW2 and the fourth switch SW4 are closed, the first switch SW1 and the third switch SW3 are opened, and the first to fourth switches SW1 to SW4 are set to the second state to charge the second battery 220. In this manner, in this embodiment, it becomes possible to charge the second battery 220 with power of the second voltage, that is, with power of a voltage according to the first voltage which is the drive voltage of the second battery 220.

[0020] The positive output terminal 141 and the negative output terminal 121 are terminals for connecting the load 400. The operating voltage range of the load 400 is a range including a voltage twice the first voltage and the third voltage.

[0021] In this embodiment, the positive output terminal 141 is connected to a line connecting the first switch SW1 and the first positive battery terminal 111, and the negative output terminal 142 is connected to a line connecting the negative input terminal 132 and the second negative battery terminal 122.

[0022] Therefore, in this embodiment, the voltage applied to the first battery 210 and the second battery 220 connected in series is applied to the load 400 at the positive output terminal 141 and the negative output terminal 142, regardless of the open / closed states of the first to fourth switches SW1 to SW4. Therefore, in this embodiment, even when the open / closed states of the first to fourth switches SW1 to SW4 are switched, the voltage applied to the load 400 does not change significantly. Therefore, this embodiment can provide a power supply device compatible with a plurality of chargers without interrupting the operation of the load.

[0023] In FIG. 2, the load 400 is connected in parallel with the first battery 210 and the second battery 220 connected in series between the positive input terminal 131 and the negative input terminal 132, and the load 400 is supplied with power from the second charger 300B at the voltage applied to the first battery 210 and the second battery 220 connected in series.

[0024] 3, the first charger 300A and the second battery 220 are connected in series between the positive output terminal 141 and the negative output terminal 142, and the first charger 300 and the first battery 210 are connected in parallel between the positive output terminal 141 and the positive electrode of the second battery 220. Therefore, in FIG. 3, the load 400 is supplied with power of the voltage applied to the first battery 210 and the second battery 220 connected in series from the first charger 300A and the second battery 220 connected in series.

[0025] 4, the first charger 300A and the first battery 210 are connected in series between the positive output terminal 141 and the negative output terminal 142, and the first charger 300 and the second battery 220 are connected in parallel between the negative electrode of the first battery 210 and the negative output terminal 142. Therefore, in FIG. 4, the load 400 is supplied with power of the voltage applied to the first battery 210 and the second battery 220 connected in series from the first charger 300A and the first battery 210 connected in series.

[0026] Fig. 5 shows an example of a state when the charger 300 is not connected to the positive input terminal 131 and the negative input terminal 132 (for example, during driving), and all of the first to fourth switches SW1 to SW4 are open in Fig. 5. At this time, the load 400 is supplied with power from the first battery 210 and the second battery 220 connected in series, at a voltage applied to the first battery 210 and the second battery 220 connected in series.

[0027] <Control of the first to fourth switches SW1 to SW4> The power supply device 100 may further include a control unit 150 that controls the first switch SW1, the second switch SW2, the third switch SW3, and the fourth switch SW4.

[0028] For example, when the charger 300 is not connected to the positive input terminal 131 and the negative input terminal 132, the control unit 150 may perform control to open all of the first to fourth switches SW1 to SW4 as shown in Fig. 5. In this manner, it becomes possible to supply power to the load 400 from the first battery 210 and the second battery 220 connected in series.

[0029] In addition, the control unit 150 may control the first to fourth switches SW1 to SW4 so that, for example, when the second charger 300B is connected to the positive input terminal 131 and the negative input terminal 132, the first switch SW1 and the fourth switch SW4 are closed and the second switch SW2 and the third switch SW3 are open as shown in Fig. 2. In this manner, the load 400 is connected in parallel with the first battery 210 and the second battery 220 connected in series between the positive input terminal 131 and the negative input terminal 132, and while the first battery 210 and the second battery 220 are being charged by the second charger 300B, it becomes possible to supply the load 400 with power of a voltage applied to the first battery 210 and the second battery 220 connected in series from the second charger 300B.

[0030] In addition, for example, when the first charger 300A is connected to the positive input terminal 131 and the negative input terminal 132, the control unit 150 may control the first to fourth switches SW1 to SW4 so that the first switch SW1 and the third switch SW3 are closed and the second switch SW2 and the fourth switch SW4 are open (first state) as shown in FIG. 3. In this manner, the first charger 300A and the second battery 220 are connected in series between the positive output terminal 141 and the negative output terminal 142, and the first charger 300 and the first battery 210 are connected in parallel between the positive output terminal 141 and the positive electrode of the second battery 220. While the first battery 210 is being charged by the first charger 300A, it becomes possible to supply power to the load 400 from the first charger 300A and the second battery 220 connected in series, at a voltage applied to the first battery 210 and the second battery 220 connected in series.

[0031] In addition, for example, when the first charger 300A is connected to the positive input terminal 131 and the negative input terminal 132, the control unit 150 may control the first to fourth switches SW1 to SW4 so that the second switch SW2 and the fourth switch SW4 are closed and the first switch SW1 and the third switch SW3 are open (second state) as shown in FIG. 4. In this manner, the first charger 300A and the first battery 210 are connected in series between the positive output terminal 141 and the negative output terminal 142, and the first charger 300 and the second battery 220 are connected in parallel between the negative electrode of the first battery 210 and the negative output terminal 142. While the second battery 220 is being charged by the first charger 300A, it becomes possible to supply power to the load 400 from the first charger 300A and first battery 210 connected in series, at a voltage applied to the first battery 210 and second battery 220 connected in series.

[0032] For example, when the first charger 300A is connected to the positive input terminal 131 and the negative input terminal 132, the control unit 150 may control the first to fourth switches SW1 to SW4 to alternate between a state (first state) in which the first switch SW1 and the third switch SW3 are closed and the second switch SW2 and the fourth switch SW4 are open as shown in Fig. 3 and a state (second state) in which the second switch SW2 and the fourth switch SW4 are closed and the first switch SW1 and the third switch SW3 are open as shown in Fig. 4, as shown in Fig. 6 and 7. In Fig. 6 and 7, the solid line indicates the voltage of the first battery 210, and the dashed line indicates the voltage of the second battery 220. In this way, while the first battery 210 and the second battery 220 are being charged by the first charger 300A, it is possible to supply the load 400 with power of the voltage applied to the first battery 210 and the second battery 220 connected in series from the first charger 300A and the first battery 210 connected in series, or from the first charger 300A and the second battery 220 connected in series. At this time, the first battery 210 and the second battery 220 are charged alternately. Therefore, even if the charging by the first charger 300A is terminated midway, it is possible to suppress the variation in the charge amount in the first battery 210 and the second battery 220.

[0033] At this time, when the control unit 150 controls the first to fourth switches SW1 to SW4 to alternate between the first state and the second state, it is preferable to switch the states of the first to fourth switches SW1 to SW4 every time a predetermined time elapses, as shown in FIG. 6, until the voltage of the first battery 210 and the voltage of the second battery 220 reach the upper limit charge of these batteries.

[0034] In the example shown in FIG. 6, when the first charger 300A is connected to the positive input terminal 131 and the negative input terminal 132, the control unit 150 (1) first sets the first to fourth switches SW1 to SW4 to a first state, (2) thereafter, when a predetermined time TP has elapsed, switches the first to fourth switches SW1 to SW4 to a second state, (3) thereafter, when the predetermined time TP has elapsed, switches the first to fourth switches SW1 to SW4 to the first state,..., (7) thereafter, When a predetermined time TP has elapsed, the first to fourth switches SW1 to SW4 are switched to the first state, (8) thereafter, when the voltage of the first battery 210 reaches the upper limit voltage of the first battery 210, the first to fourth switches SW1 to SW4 are switched to the second state, and (9) thereafter, when the voltage of the second battery 220 reaches the upper limit voltage of the second battery 220, all of the first to fourth switches SW1 to SW4 are opened, and charging by the first charger 300A is terminated.

[0035] Furthermore, when controlling the first to fourth switches SW1 to SW4 to alternate between the first state and the second state, the control unit 150 may switch the states of the first to fourth switches SW1 to SW4 each time the voltage of the battery being charged becomes higher than the other battery by a predetermined voltage value until the voltage of the first battery 210 and the voltage of the second battery 220 reach the upper limit charging of these batteries, as shown in Fig. 7. In this way, it is possible to reduce the number of times the states of the first to fourth switches SW1 to SW4 are switched.

[0036] In the example shown in FIG. 7, when the first charger 300A is connected to the positive input terminal 131 and the negative input terminal 132, the control unit 150 (1) first sets the first to fourth switches SW1 to SW4 to a first state, (2) thereafter, when the voltage of the first battery 210 becomes higher than the voltage of the second battery 220 by a predetermined voltage value VP, switches the first to fourth switches SW1 to SW4 to a second state, and (3) thereafter, when the voltage of the second battery 220 becomes higher than the voltage of the first battery 210 by the predetermined voltage value VP, switches the first to fourth switches SW1 to SW4 to the first state. (4) thereafter, when the voltage of the first battery 210 becomes higher than the voltage of the second battery 220 by a predetermined voltage value VP, the first to fourth switches SW1 to SW4 are switched to the second state; (5) thereafter, when the voltage of the second battery 220 becomes the upper limit voltage of the second battery 220, the first to fourth switches SW1 to SW4 are switched to the first state; (6) thereafter, when the voltage of the first battery 220 reaches the upper limit voltage of the first battery 210, all of the first to fourth switches SW1 to SW4 are opened, and charging by the first charger 300A is terminated.

[0037] 1, a fifth switch SW5 may be provided at the positive output terminal 141, and a sixth switch SW6 may be provided at the negative output terminal 142. The control unit 150 may control the fifth switch SW5 and the sixth switch SW6. In this way, it becomes possible to cut off the supply of power to the load 400.

[0038] 2 to 5, when the load 400 is connected to the positive output terminal 141 and the negative output terminal 142, the control unit 150 may close the fifth switch SW5 and the sixth switch SW6, and open the fifth switch SW5 and the sixth switch SW6 when the load 400 is not connected to the positive output terminal 141 and the negative output terminal 142, thereby controlling the fifth switch SW5 and the sixth switch SW6. In this way, when the load 400 is not connected to the positive output terminal 141 and the negative output terminal 142, it is possible to separate the positive output terminal 141 and the negative output terminal 142 from the first battery 210 and the second battery 220.

[0039] The present invention has been described above in terms of preferred embodiments thereof. Although the present invention has been described herein with reference to specific examples, various modifications and variations can be made to these examples without departing from the spirit and scope of the present invention as set forth in the claims. [Explanation of symbols]

[0040] 100 Power supply 111 First positive battery terminal 112 first negative battery terminal 121 Second positive battery terminal 122 Second negative battery terminal 131 Positive input terminal 132 Negative input terminal 141 Positive output terminal 142 Negative output terminal 150 Control section SW1 First switch SW2 Second switch SW3 Third switch SW4 4th switch 210 First Battery 220 Second Battery 300 charger 300A Primary Charger 300B Secondary Charger 400 Load

Claims

1. a first positive battery terminal and a first negative battery terminal for connecting a battery; a second positive battery terminal and a second negative battery terminal for connecting the battery; a positive input terminal and a negative input terminal for connecting a charger; a positive output terminal and a negative output terminal for connecting a load; A first switch; A second switch; A third switch; and a fourth switch; the first negative battery terminal is connected to the second positive battery terminal; the first switch is connected between the first positive battery terminal and the positive input terminal; the second switch is connected between a first connection point between the first negative battery terminal and the second positive battery terminal and the positive input terminal; the third switch is connected between a second connection point between the first negative battery terminal and the second positive battery terminal and the negative input terminal; the fourth switch is connected between the second negative battery terminal and the negative input terminal; the positive output terminal is connected to a line connecting the first switch and the first positive battery terminal; The negative output terminal is connected to a line connecting the negative input terminal and the second negative battery terminal.

2. a control unit that controls the first switch, the second switch, the third switch, and the fourth switch, 2. The power supply device according to claim 1, wherein the control unit controls all of the first switch, the second switch, the third switch, and the fourth switch to be opened when a first battery having a driving voltage of a first voltage is connected to the first positive battery terminal and the first negative battery terminal, a second battery having a driving voltage of the first voltage is connected to the second positive battery terminal and the second negative battery terminal, a charger is not connected to the positive input terminal and the negative input terminal, and a load whose operating voltage range includes a voltage twice the first voltage is connected to the positive output terminal and the negative output terminal.

3. 3. The power supply device according to claim 2, wherein when the first battery is connected to the first positive battery terminal and the first negative battery terminal, the second battery is connected to the second positive battery terminal and the second negative battery terminal, a first charger is connected that supplies power of a second voltage that is equal to or higher than the first voltage and lower than twice the first voltage, and the load is connected to the positive input terminal and the negative input terminal, the control unit controls the first switch, the second switch, the third switch, and the fourth switch to a first state in which the first switch and the third switch are closed and the second switch and the fourth switch are open.

4. 3. The power supply device according to claim 2, wherein when the first battery is connected to the first positive battery terminal and the first negative battery terminal, the second battery is connected to the second positive battery terminal and the second negative battery terminal, a first charger is connected that supplies power of a second voltage that is equal to or higher than the first voltage and lower than twice the first voltage, and the load is connected to the positive input terminal and the negative input terminal, the control unit controls the first switch, the second switch, the third switch, and the fourth switch to a second state in which the second switch and the fourth switch are closed and the first switch and the third switch are open.

5. 3. The power supply device according to claim 2, wherein, when the first battery is connected to the first positive battery terminal and the first negative battery terminal, the second battery is connected to the second positive battery terminal and the second negative battery terminal, a first charger is connected that supplies power of a second voltage that is equal to or higher than the first voltage and lower than twice the first voltage, and the load is connected to the positive input terminal and the negative input terminal, the control unit controls the first switch, the second switch, the third switch, and the fourth switch to alternately switch between a first state in which the first switch and the third switch are closed and the second switch and the fourth switch are open, and a second state in which the second switch and the fourth switch are closed and the first switch and the third switch are open.

6. 6. The power supply device of claim 5, wherein the control unit, when controlling the first switch, the second switch, the third switch, and the fourth switch to alternately switch between the first state and the second state, switches the states of the first switch, the second switch, the third switch, and the fourth switch every time a predetermined time elapses.

7. 6. The power supply device according to claim 5, wherein when the control unit controls the first switch, the second switch, the third switch, and the fourth switch to alternately switch between the first state and the second state, the control unit switches the states of the first switch, the second switch, the third switch, and the fourth switch each time a voltage of the battery being charged becomes higher than that of the other battery by a predetermined voltage value.

8. 3. The power supply device according to claim 2, wherein when the first battery is connected to the first positive battery terminal and the first negative battery terminal, the second battery is connected to the second positive battery terminal and the second negative battery terminal, a second charger supplying power of a third voltage that is at least twice the first voltage is connected, and a load having an operating voltage range that includes a voltage that is twice the first voltage and the third voltage is connected to the positive input terminal and the negative input terminal, the control unit controls the first switch, the second switch, the third switch, and the fourth switch so that the first switch and the fourth switch are closed and the second switch and the third switch are open.

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