Power supply device

Abstract

A power supply device includes: a battery configured to supply power to a first power supply line; a first power converter configured to convert output power from the battery into power having a first voltage value and supply the power having the first voltage value to a second power supply line; a second power converter configured to convert output power from the battery into power having a first voltage value and supply the power having the first voltage value to a second power supply line; and a controller configured to control the first power converter and the second power converter, in which the controller is configured to: control the first power converter to be turned on and control the second power converter to be turned off during a first period; and controlling the first power converter to be turned off and controlling the second power converter to be turned on during a period other than the first period.

Description

Technical Field

[0001] This invention relates to a power supply device. Background Technology

[0002] Traditionally, vehicles include a low-voltage battery installed therein, which outputs low-voltage electricity to supply low-voltage power to, for example, an ECU used to control the vehicle's electrical components. In addition to the low-voltage battery, electric vehicles (BEVs) and hybrid vehicles (HEVs and PHEVs) also include a high-voltage battery installed therein, which outputs high-voltage electricity to supply high-voltage power to, for example, an electric motor used to drive the vehicle (see, for example, Patent Document 1).

[0003] Reference List

[0004] Patent documents

[0005] Patent Document 1: JP 2020-124060 A Summary of the Invention

[0006] In electric vehicles, the cost and / or weight increase because low-voltage batteries are installed in addition to high-voltage batteries. Furthermore, the lifespan of lead-acid batteries used as low-voltage batteries is approximately three years. This is one of the reasons why installing low-voltage batteries in electric vehicles leads to increased costs.

[0007] The purpose of this invention is to enable the driving of two loads with different driving voltages.

[0008] To achieve this objective, a power supply device according to an embodiment of the present invention includes: a battery configured to supply power to a first power supply line; a first power converter configured to convert output power from the battery into power having a first voltage value and supply power having the first voltage value to a second power supply line; a second power converter configured to convert output power from the battery into power having the first voltage value and supply power having the first voltage value to the second power supply line; and a controller configured to control the first power converter and the second power converter, wherein the controller is configured to: control the first power converter to turn on and control the second power converter to turn off during a first time period; and control the first power converter to turn off and control the second power converter to turn on during time periods other than the first time period.

[0009] This invention can drive two types of loads with different driving voltages. Attached Figure Description

[0010] Figure 1A power supply device 100 according to an embodiment of the present invention is shown;

[0011] Figure 2 An example process is shown that is executed in the controller 140 of the power supply device 100 according to this embodiment when a switching process occurs from the second time period to the first time period (when the vehicle's ignition switch switches from the off state to the on state).

[0012] Figure 3 An example process is shown that is executed in the controller 140 of the power supply device 100 according to this embodiment when a switching process occurs from the first time period to the second time period (when the vehicle's ignition switch switches from the on state to the off state);

[0013] Figure 4 Another example of a power supply device 100 is shown; and

[0014] Figure 5 An example controller 140 is shown.

[0015] Reference tag list

[0016] 100 Power supply unit

[0017] 110 battery

[0018] 111 battery cell

[0019] 112 sub-cells

[0020] 120 First Power Converter

[0021] 121 Control Department

[0022] 130 Second Power Converter

[0023] 131 Control Department

[0024] 140 Controller

[0025] 141 Control Department

[0026] 142 Mechanical Relay

[0027] 143 NOT circuit Detailed Implementation

[0028] <Power Supply Unit 100>

[0029] Figure 1A power supply device 100 according to an embodiment of the present invention is shown. The power supply device 100 includes a battery 110, a first power converter 120, a second power converter 130, and a controller 140. The power supply device 100 supplies power to a first load L1 via a first power supply line PL1, wherein the first load L1 is configured to be driven by an output voltage value VB of the battery 110 (e.g., a voltage greater than or equal to 200V). The power supply device 100 also supplies power to a second load L2 and a third load L3 via a second power supply line PL2, wherein the second load L2 is configured to be driven by a voltage value lower than the output voltage value VB of the battery 110 (e.g., 12V).

[0030] Battery 110 supplies power to the first power supply line PL1 at its output voltage VB. Battery 110 is formed, for example, by a plurality of battery cells 111 connected in series, such as a lithium-ion battery. A first load L1 is connected to the first power supply line PL1, wherein the first load L1 is configured to be driven by the output voltage VB of battery 110, and wherein output power from battery 110 is supplied to the first load L1 via the first power supply line PL1. Although Figure 1 A first load L1 is shown, but more than two first loads L1 can also be set.

[0031] The first power converter 120 converts the output power from the battery 110 into power with a first voltage value V1 (e.g., 12V), and supplies the power with the first voltage value V1 to the second power supply line PL2. That is, the first power converter 120 converts the output voltage value VB of the output power from the battery 110 into the first voltage value V1, and then supplies the converted output power to the second power supply line PL2.

[0032] For example, the first power converter 120 is configured as a DC / DC converter (e.g., an isolated DC / DC converter) and includes a first power input terminal PI11, a second power input terminal PI12, a first power output terminal PO11, and a second power output terminal PO12. The first power input terminal PI11 is connected to the positive terminal of the battery 110, and the second power input terminal PI12 is connected to the negative terminal of the battery 110. The first power converter 120 receives power with an output voltage value VB from the battery 110 as input through the first power input terminal PI11 and the second power input terminal PI12. The first power converter 120 outputs power with a first voltage value V1 through the first power output terminal PO11 and the second power output terminal PO12. Figure 1 In the example shown, the first power output terminal PO11 is connected to the second power supply line PL2, and the second power output terminal PO12 is grounded. Power output from the first power converter 120 is then supplied to the load connected to the second power supply line PL2.

[0033] The first power converter 120 includes a control unit 121 configured to control the operation of the first power converter 120. For example, the control unit 121 may be configured as a computer. The control unit 121 includes a control signal input terminal CI1 and is configured to control the on / off state of the first power converter 120 based on a signal received from the control signal input terminal CI1. Specifically, the control unit 121 of the first power converter 120 switches the state of the first power converter 120 between two states based on the signal received from the control signal input terminal CI1, wherein in one of the two states, the first power converter 120 supplies power to the second power supply line PL2 (on state), and in the other of the two states, the first power converter 120 does not supply power to the second power supply line PL2 (off state).

[0034] The second power converter 130 converts the output power from the battery 110 into power with a first voltage value V1, and supplies the power with the first voltage value V1 to the second power supply line PL2. That is, the second power converter 130 converts the output voltage value VB of the output power from the battery 110 into the first voltage value V1, and then supplies the converted output power to the second power supply line PL2.

[0035] For example, the second power converter 130 is configured as a DC / DC converter (e.g., an isolated DC / DC converter) and includes a first power input terminal PI21, a second power input terminal PI22, a first power output terminal PO21, and a second power output terminal PO22. The first power input terminal PI21 is connected to the positive terminal of the battery 110, and the second power input terminal PI22 is connected to the negative terminal of the battery 110. The second power converter 130 receives power with an output voltage value VB from the battery 110 as input through the first power input terminal PI21 and the second power input terminal PI22. The second power converter 130 outputs power with a first voltage value V1 through the first power output terminal PO21 and the second power output terminal PO22. Figure 1 In the example shown, the first power output terminal PO21 is connected to the second power supply line PL2, and the second power output terminal PO22 is grounded. Power output from the second power converter 130 is then supplied to the load connected to the second power supply line PL2.

[0036] The second power converter 130 includes a control unit 131 configured to control the operation of the second power converter 130. For example, the control unit 131 may be configured as a computer. The control unit 131 includes a control signal input terminal CI2 and is configured to control the on / off state of the second power converter 130 based on a signal received from the control signal input terminal CI2. Specifically, the control unit 131 of the second power converter 130 switches the state of the second power converter 130 between two states based on a signal received from the control signal input terminal CI2, wherein in one of the two states, the second power converter 130 supplies power to the second power supply line PL2 (on state), and in the other of the two states, the second power converter 130 does not supply power to the second power supply line PL2 (off state).

[0037] Controller 140 controls the switching on / off of the first power converter 120 and the second power converter 130. Controller 140 includes a first control signal output terminal CO1 and a second control signal output terminal CO2. The first control signal output terminal CO1 is connected to the control signal input terminal CI1 of the control unit 121 of the first power converter 120, and the second control signal output terminal CO2 is connected to the control signal input terminal CI2 of the control unit 131 of the second power converter 130. Controller 140 outputs a control signal through the first control signal output terminal CO1, supplying it to the control signal input terminal CI1 of the control unit 121 of the first power converter 120 to control the switching on / off of the first power converter 120. Controller 140 outputs a control signal through the second control signal output terminal CO2, supplying it to the control signal input terminal CI2 of the control unit 131 of the second power converter 130 to control the switching on / off of the second power converter 130.

[0038] In this embodiment, the second load L2 and the third load L3 are connected to the second power supply line PL2, which is supplied with power having a first voltage value V1. The first voltage value V1 is capable of driving the second load L2 and the third load L3. The output voltage value VB from the battery 110 cannot be used to drive the second load L2 and / or the third load L3, and is, for example, greater than the first voltage value V1, greater than the voltage value capable of driving the second load L2 and / or the third load L3. The second load L2 is configured to be on during a first time period and off during a time period other than the first time period (the second time period), while the third load L3 is configured to be always on. Although Figure 1 A second load L2 and a third load L3 are shown, but more than two second loads L2 and / or more than two third loads L3 can be set.

[0039] That is, during the first time period according to this embodiment, the power supplied to the second power supply line PL2 is consumed by the second load L2 and the third load L3, while during the second time period, the power supplied to the second power supply line PL2 is not consumed by the second load L2, but by the third load L3. Therefore, the power consumption during the second time period according to this embodiment is lower than the power consumption during the first time period.

[0040] Therefore, according to this embodiment, the second power converter 130 is configured to output power with a power value less than the power value output by the first power converter 120. The controller 140 is configured to control the first power converter 120 to turn on and the second power converter 130 to turn off during a first time period; and to control the first power converter 120 to turn off and the second power converter 130 to turn on during a second time period (a time period other than the first time period). That is, according to this embodiment, during the first time period, both the second load L2 and the third load L3 are on, and during this first time period, the power from the battery 110 is converted from the output voltage value VB of the battery 110 to a first voltage value V1 by the first power converter 120. During the second time period, the second load is off and the third load L3 is on, and during this second time period, the output voltage value VB of the battery 110 is converted to the first voltage value V1 by the second power converter 130, wherein the power value output by the second power converter 130 is less than the power value output by the first power converter 120.

[0041] In this scenario, the maximum output power of the second power converter 130 can preferably be, for example, less than the maximum output power of the first power converter 120. Furthermore, the rated current of the second power converter can be less than the rated current of the first power converter 120. In this case, the maximum output power and / or rated current of the first power converter 120 can preferably be configured to be selected based on the power consumption value during the first time period, and the maximum output power and / or rated current of the second power converter 130 can also preferably be configured to be selected based on the power consumption value during the second time period. For example, the maximum output power and / or rated current of the first power converter 120 can preferably be configured to be selected to improve the conversion efficiency for supplying power with the power consumption value during the first time period, and the maximum output power and / or rated current of the second power converter 130 can preferably be selected to improve the conversion efficiency for supplying power with the power consumption value during the second time period.

[0042] As described above, according to this embodiment, the battery 110 used to supply power to the first load L1 is also used to supply power to the second load L2 and the third load L3, which have different drive voltages than the first load L1. In this way, this embodiment eliminates the need for an additional battery for supplying power to the second load L2 and / or the third load L3, while simultaneously enabling the battery 110 to supply power to both the first load L1 and the second load L2 / / or the third load L3. That is, this embodiment can drive two types of loads with different drive voltages with a low-cost and low-weight configuration.

[0043] Furthermore, according to this embodiment, the first power converter 120 with high output power is used only during a first period of high power consumption, while the second power converter 130 with low output power is used during a second period of low power consumption. Therefore, according to this embodiment, the output power from the battery 110 can be used to supply power to loads (second load L2 and / or third load L3) whose drive voltage is lower than the output voltage VB from the battery 110, without reducing conversion efficiency.

[0044] For example, the power supply unit 100 is used in a vehicle (such as a battery-electric vehicle), wherein the first load L1 is, for example, a drive motor for the vehicle, and the second load L2 and / or the third load L3 is, for example, an ECU for the vehicle. Specifically, the second load L2 is configured to be on when the vehicle's ignition switch is on, and configured to be off when the vehicle's ignition switch is off. The third load L3 is configured to always be on regardless of the state of the vehicle's ignition switch. That is, the ignition switch is on during a first time period, and off during a second time period.

[0045] In this configuration, the controller 140 includes means for checking the state of the ignition switch. Furthermore, when the ignition switch switches from an off state to an on state, the controller 140 controls the second power converter 130 to disconnect and controls the first power converter 120 to connect, wherein when the ignition switch switches from an on state to an off state, the controller 140 controls the first power converter 120 to disconnect and controls the second power converter 130 to connect.

[0046] In this way, the power consumed during the period when the vehicle's ignition switch is off can be supplied from the battery 110 without reducing the conversion efficiency (so-called dark current).

[0047] Figure 2An example process is shown, executed in the controller 140 of the power supply device 100 according to this embodiment, when a switching process occurs from the second time period to the first time period (when the vehicle's ignition switch switches from the off state to the on state). The controller 140 controls the second power converter 130 to disconnect (step S201). The controller 140 controls the first power converter 120 to connect (step S202).

[0048] Figure 3 An example process is shown, executed in the controller 140 of the power supply device 100 according to this embodiment, when a switching process occurs from the first time period to the second time period (when the vehicle's ignition switch switches from the on state to the off state). The controller 140 controls the first power converter 120 to disconnect (step S301). The controller 140 controls the second power converter 130 to connect (step S302).

[0049] <Third Power Converter 150>

[0050] The control unit 121 of the first power converter 120 includes a power input terminal CP1 for receiving supplied power, and the control unit 131 of the second power converter 130 includes a power input terminal CP2 for receiving supplied power, wherein the controller 140 includes a power input terminal CP3 for receiving supplied power. Figure 1 As shown, the power input terminal CP1 of the control unit 121 of the first power converter 120, the power input terminal CP2 of the control unit 131 of the second power converter 130, and / or the power input terminal CP3 of the controller 140 can preferably be connected to the second power supply line PL2. In this way, power can be supplied to the control unit 121 of the first power converter 120, the control unit 131 of the second power converter 130, and / or the controller 140 via the second power supply line PL2, wherein power with a voltage value lower than the output voltage value of the battery 110 can subsequently be supplied to the control unit 121 of the first power converter 120, the control unit 131 of the second power converter 130, and / or the controller 140.

[0051] When the first power converter 120 and / or the second power converter 130 switches from the off state to the on state, power may begin to be supplied from the first power converter 120 and / or the second power converter 130 to the second power supply line PL2 at the time that the switching process from the off state to the on state may occur in the power converter. That is, when the first power converter 120 and / or the second power converter 130 switches from the off state to the on state, there may be a moment when neither the first power converter 120 nor the second power converter 130 supplies power to the second power supply line PL2. If there is a moment when power is not supplied to the second power supply line PL2, it means that no power is supplied to the load (second load L2, third load L3, control unit 121 of the first power converter 120, control unit 131 of the second power converter 130, and controller 140) at that moment. Furthermore, since no power is supplied to the control unit 121 of the first power converter 120, the control unit 131 of the second power converter 130, and / or the controller 140 at this time, the switching process from the off state to the on state of the first power converter 120 and / or the second power converter 130 may not be performed correctly at this time.

[0052] Therefore, as Figure 4 As shown, the power supply device 100 may further include a third power converter 150. The third power converter 150 converts the output power from the battery 110 into power having a second voltage value V2 (e.g., 10V), and supplies this power having the second voltage value V2 to the second power supply line PL2. That is, the third power converter 150 converts the output power from the battery 110 into the second voltage value V2, and then supplies the converted output power to the second power supply line PL2. For example, the third power converter 150 is configured to always be in an on state.

[0053] For example, the third power converter 150 is configured as a DC / DC converter (e.g., an isolated DC / DC converter) and includes a first power input terminal PI31, a second power input terminal PI32, a first power output terminal PO31, and a second power output terminal PO32.

[0054] The first power input terminal PI31 can be connected to the positive terminal of the battery 110, and the second power input terminal PI32 can be connected to the negative terminal of the battery 110. Alternatively, as... Figure 4 As shown, the first power input terminal PI31 can be connected to the positive terminal of the sub-battery 112 (as shown in the diagram). Figure 4In the example shown, the battery is formed by some battery cells 111 of the battery 110 located on the negative side of the battery 110, and the second power input terminal PI32 can be connected to the negative terminal of the sub-battery 112, wherein the sub-battery 112 is formed by some battery cells 111 of the battery 110. When the first power input terminal PI31 and the second power input terminal PI32 are respectively connected to the positive and negative terminals of the battery 110, the third power converter 150 receives power with the output voltage value VB of the battery 110 through the first power input terminal PI31 and the second power input terminal PI32. When the first power input terminal PI31 and the second power input terminal PI32 are respectively connected to the positive and negative terminals of the sub-battery 112, the third power converter 150 receives power with the output voltage value VSB (<VB) of the sub-battery 112 through the first power input terminal PI31 and the second power input terminal PI32.

[0055] The third power converter 150 outputs power with a second voltage value V2 through the first power output terminal PO31 and the second power output terminal PO32. Figure 4 In the example shown, the first power output terminal PO31 is connected to the second power supply line PL2, and the second power output terminal PO32 is grounded. Power output from the third power converter 150 is supplied to the load connected to the second power supply line PL2.

[0056] In this way, power will be supplied from the third power converter 150 to the second power supply line PL2, and even if there are periods when power is not supplied from the first power converter 120 or the second power converter 130 to the second power supply line PL2, power can always be supplied to the loads connected to the second power supply line PL2 (second load L2, third load L3, control unit 121 of the first power converter 120, control unit 131 of the second power converter 130 and controller 140).

[0057] In this case, the second voltage value V2 can preferably be lower than the first voltage value V1, and the first power output terminal PO31 of the third power converter 150 can preferably be connected to the second power supply line PL2 via the first diode D1, such that the forward orientation of the first diode D1 is from the first power output terminal PO31 of the third power converter 150 toward the second power supply line PL2.

[0058] In this manner, power is supplied from the third power converter 150 to the second power supply line PL2 only during periods when power is not supplied from the first power converter 120 or the second power converter 130; and when power is supplied from the first power converter 120 or the second power converter 130 to the second power supply line PL2, power is not supplied from the third power converter 150 to the second power supply line PL2. As a result, even if the third power converter 150 remains constantly switched on, power is supplied to the second power supply line PL2 only when necessary.

[0059] <Controller 140>

[0060] Controller 140 can be formed by a computer, or, as... Figure 5 As shown, it may include a control unit 141 formed by a computer, a mechanical relay 142, and a NOT circuit 143.

[0061] The control unit 141 includes a power input terminal CP31 and a control signal output terminal CO11. The power input terminal CP31 is connected to the second power supply line PL2, and the control unit 141 receives power supplied from the second power supply line PL2. The control unit 141 outputs a control signal through the control signal output terminal CO11.

[0062] The switch of mechanical relay 142 is connected between the second power supply line PL2 and the control signal input terminal CI1 of the control unit 121 of the first power converter 120. The coil of mechanical relay 142 is connected between the control signal output terminal CO11 of the control unit 141 and ground. The input terminal of NOT circuit 143 is connected to the control signal output terminal CO11 of the control unit 141, and the output terminal of NOT circuit 143 is connected to the control signal input terminal CI2 of the control unit 131 of the second power converter 130.

[0063] Therefore, when the control unit 141 outputs a high-level signal through the control signal output terminal CO11, the mechanical relay 142 is switched on, and the first control signal output terminal CO1 of the controller 140 is then conductively connected to the second power supply line PL2. At this time, a high-level signal is supplied to the input terminal of the NOT circuit 143, and a low-level signal is subsequently output from the output terminal of the NOT circuit 143. As a result, when the control unit 141 outputs a high-level signal through the control signal output terminal CO11, this high-level signal (a signal having a first voltage value V1 or a second voltage value V2) is supplied to the control signal input terminal CI1 of the control unit 121 of the first power converter 120, and a low-level signal is subsequently supplied to the control signal input terminal CI2 of the control unit 131 of the second power converter 130.

[0064] On the other hand, when the control unit 141 outputs a low-level signal (0V signal) through the control signal output terminal CO11, the switch of the mechanical relay 142 is turned off, and the control signal input terminal CI1 of the control unit 121 of the first power converter 120 is subsequently isolated from the second power supply line PL2. At this time, a low-level signal is supplied to the input terminal of the NOT circuit 143, and a high-level signal is subsequently output from the output terminal of the NOT circuit 143. As a result, when the control unit 141 outputs a low-level signal (0V signal) through the control signal output terminal CO11, the low-level signal (0V signal) is supplied to the control signal input terminal CI1 of the control unit 121 of the first power converter 120, and the high-level signal is subsequently supplied to the control signal output terminal CI2 of the control unit 131 of the second power converter 130.

[0065] Therefore, the control unit 141 can preferably output a high-level signal through the control signal output terminal CO11 during the first time period and output a low-level signal (0V signal) through the control signal output terminal CO11 during time periods other than the first time period. In this case, the control unit 121 of the first power converter 120 can preferably be configured to control the first power converter 120 to turn on when a high-level signal is supplied to the control signal input terminal CI1 and to control the first power converter 120 to turn off when a low-level signal is supplied to the control signal input terminal CI1. The control unit 131 of the second power converter 130 can preferably be configured to control the second power converter 130 to turn on when a high-level signal is supplied to the control signal input terminal CI2 and to control the second power converter 130 to turn off when a low-level signal is supplied to the control signal input terminal CI2.

[0066] In this way, the controller 140 is able to control the first power converter 120 to turn on and the second power converter 130 to turn off during a first time period, wherein the controller 140 is able to control the first power converter 120 to turn off and the second power converter 130 to turn on during a second time period (a time period other than the first time period).

[0067] The control unit 141 can also preferably output a low-level signal (0V signal) through the control signal output terminal CO11 during the first time period and output a high-level signal through the control signal output terminal CO11 during time periods other than the first time period. In this case, the control unit 121 of the first power converter 120 can preferably be configured to control the first power converter 120 to turn on when a low-level signal is supplied to the control signal input terminal CI1, and to control the first power converter 120 to turn off when a high-level signal is supplied to the control signal input terminal CI1. The control unit 131 of the second power converter 130 can preferably be configured to control the second power converter 130 to turn on when a high-level signal is supplied to the control signal input terminal CI2, and to control the second power converter 130 to turn off when a high-level signal is supplied to the control signal input terminal CI2.

[0068] Similarly, in this way, the controller 140 is able to control the first power converter 120 to turn on and the second power converter 130 to turn off during the first time period, wherein the controller 140 is able to control the first power converter 120 to turn off and the second power converter 130 to turn on during the second time period (the time period other than the first time period).

[0069] The present invention has been described above through preferred embodiments. While the invention has been described herein by way of specific examples, various modifications and changes may be made to such examples without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A power supply device, comprising: A battery configured to supply power to a first power supply line; A first power converter is configured to convert output power from the battery into power having a first voltage value and supply the power having the first voltage value to a second power supply line; A second power converter is configured to convert output power from the battery into power having the first voltage value, and to supply power having the first voltage value to the second power supply line; as well as A controller configured to control the first power converter and the second power converter. The controller is configured as follows: During the first time period, the first power converter is turned on and the second power converter is turned off; and During periods other than the first time period, the first power converter is controlled to disconnect and the second power converter is controlled to connect.

2. The power supply device according to claim 1, in, The second power supply line is connected to the second load and the third load. The second load is configured as follows: It was connected during the first time period; and Disconnect during periods other than the first time period. The third load is configured to be always on.

3. The power supply device according to claim 1, in, The power supply unit is configured as a power supply unit for a vehicle. During the first time period, the vehicle's ignition switch is configured to be turned on, and During periods other than the first time period, the vehicle's ignition switch is configured to be off.

4. The power supply device according to claim 2 or 3, in, The second power converter is capable of outputting power with electrical values. The power value is less than the power value that the first power converter can output.

5. The power supply device according to claim 4, further comprising: A third power converter is configured to convert the output power from the battery into power with a second voltage value and output the power with the second voltage value to the second power supply line.

6. The power supply device according to claim 5, further comprising: A first diode is connected between the second power supply line and the third power converter. Wherein, the second voltage value is less than the first voltage value, and The forward direction of the first diode is from the third power converter toward the second power supply line.

7. The power supply device according to claim 6, in, The first power converter includes a control unit configured to control the operation of the first power converter. The control unit of the first power converter includes a power input terminal for receiving the supplied power. The second power converter includes a control unit configured to control the operation of the second power converter. The control unit of the second power converter includes a power input terminal for receiving the supplied power. The controller includes a power input terminal for receiving the supplied power, and The power input terminals of the control unit of the first power converter, the control unit of the second power converter, and the controller are connected to the second power supply line.

8. The power supply device according to claim 6, in, The battery comprises multiple battery cells. The third power converter is configured to convert the output power from the sub-battery into power having the second voltage value, and output the power having the second voltage value to the second power supply line. The sub-battery is formed from a portion of the battery cells of the battery.

9. The power supply device according to claim 4, in, The first power converter includes a control unit configured to control the operation of the first power converter. The control unit of the first power converter includes a control signal input terminal for receiving control signals. The control unit of the first power converter is configured to control the switching on / off of the first power converter based on a control signal received from the control signal input terminal of the control unit of the first power converter. The second power converter includes a control unit configured to control the operation of the second power converter. The control unit of the second power converter includes a control signal input terminal for receiving control signals, and The control unit of the second power converter is configured to control the switching on / off of the second power converter based on the control signal received from the control signal input terminal of the control unit of the second power converter.

10. The power supply device according to claim 9, in, The controller includes a control unit, a mechanical relay, and a NOT circuit. The controller's control unit includes a control signal output terminal for outputting control signals. The mechanical relay switch is connected between the second power supply line and the control signal input terminal of the control unit of the first power converter. The coil of the mechanical relay is connected between the control signal output terminal of the controller's control unit and ground. The input terminal of the NOT circuit is connected to the control signal output terminal of the control unit of the controller, and The output terminal of the NOT circuit is connected to the control signal input terminal of the control unit of the second power converter.

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