Control device for electric device provided in moving body, program, and control method for electric device

Abstract

A moving body (10) comprises an electric device (30) and equipment (20) to be supplied with power. A control device (80) is applied to the electric device that supplies power input from an AC power supply (60) to the equipment (20) to be supplied with power. The electric device comprises: a first electrical path (101); a second electrical path (102); an X capacitor (160); Y capacitors (120, 130); a series-connected body of a precharge switch (161) and a precharge resistor (162); a main switch (163) connected in parallel with the series-connected body; and a switching power supply (140). The control device for the electric device comprises a switch control unit that switches the precharge switch to ON at a timing before a voltage of the AC power supply is applied to the first electrical path and the second electrical path.

Description

Control Device, Program, and Control Method for an Electrical Device Provided in a Moving Body Cross - reference to Related Applications

[0001] This application is based on Japanese Application No. 2024 - 181216 filed on October 16, 2024, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a control device, a program, and a control method for an electrical device provided in a moving body.

[0003] Conventionally, an electrical device including a charger including an AC filter and a switching power supply is known. When an AC power supply voltage is applied to a first electrical path and a second electrical path constituting the electrical device, it is known that the current flowing through the electrical device flows to the ground as a leakage current. The noise filter circuit described in Patent Document 1 suppresses the leakage current flowing to the ground through a capacitor.

[0004] Japanese Patent No. 3667962

[0005] The noise filter circuit described in Patent Document 1 includes a Y - capacitor, a bidirectionally connected Zener diode, and a housing. The bidirectionally connected Zener diode is connected between the connection point of the Y - capacitor and the housing. The connection point between the bidirectionally connected Zener diode and the housing is connected to the ground. Thus, the noise filter circuit described in Patent Document 1 has a problem that the circuit becomes complicated. [[ID=I9]]

[0006] The present disclosure has been made to solve the above problems, and its main object is to provide a control device, a program, and a control method for an electrical device that can suppress leakage current flowing to the ground with a simplified configuration.

[0007] This disclosure relates to a control device for an electrical device installed on a mobile body, which supplies power input from an AC power source to a powered device installed on the mobile body, wherein the electrical device comprises: a first electrical path; a second electrical path; an X capacitor connecting the first electrical path and the second electrical path; a Y capacitor connecting the second electrical path and the second electrical path; a series connection of a precharge switch and a precharge resistor; a main switch connected in parallel to the series connection; and a switching power supply having a smoothing capacitor, wherein the AC power source is connected to the input portion of the first electrical path and the input portion of the second electrical path; the powered device is connected to the output portion of the first electrical path and the output portion of the second electrical path via the switching power supply; a ground is connected to the connection portion of the first and second capacitors constituting the Y capacitor; and the main switch is provided on the AC power source side of the first and second electrical paths than the connection portion with the Y capacitor.

[0008] Before the AC power supply applies voltage to the first and second electrical paths, and before the control device switches the switching power supply, the smoothing capacitor needs to be precharged. The control device switches the precharge switch ON at the timing before switching the switching power supply. The precharge switch and precharge resistor are connected in series and are located on the AC power supply side of the smoothing capacitor connection. In this case, current flows through the closed circuit including the AC power supply, the first electrical path, the switching power supply, the smoothing capacitor, the second electrical path, and the precharge resistor. Because the closed circuit includes the precharge resistor, the impedance of the closed circuit increases. Therefore, the inrush current flowing to the smoothing capacitor is suppressed.

[0009] The switch control unit of the control device switches the precharge switch to ON at a timing before the voltage of the AC power supply is applied to the first and second electrical paths. The series connection of the precharge switch and the precharge resistor is located on the AC power supply side of the connection portion of the Y capacitor. In this case, current flows through a closed circuit including the AC power supply, the first electrical path, the Y capacitor, the second electrical path, and the precharge resistor. Since the closed circuit is formed before current flows from the AC power supply, a portion of the current that would flow to ground through the Y capacitor flows through the formed closed circuit. Therefore, leakage current flowing to ground through the Y capacitor can be suppressed.

[0010] Thus, according to this disclosure, the leakage current flowing from the Y capacitor to ground can be suppressed by reusing the pre-charge circuit that suppresses the inrush current from the AC power supply to the smoothing capacitor. In other words, the leakage current flowing from the Y capacitor to ground can be suppressed with a simplified configuration.

[0011] The above-mentioned and other purposes, features and advantages of this disclosure will become clearer from the following detailed description with reference to the attached drawings. The drawings are as follows: Figure 1 is a diagram of the configuration of the AC power supply and mobile unit; Figure 2 is a diagram of the overall configuration of the electrical device; Figure 3 is a flowchart showing the command and control procedure of the electrical device; Figure 4 is a time chart showing the command and control procedure of the electrical device; Figure 5 is a diagram showing an example of the current flow mode; Figure 6 is a time chart showing the changes in current and voltage, etc.; and Figure 7 is a time chart showing the changes in current and voltage, etc. related to a comparative example.

[0012] Hereinafter, an embodiment of the electrical device relating to this disclosure will be described with reference to the drawings. In this embodiment, the electrical device is installed in an electric vehicle such as an electric vehicle or a hybrid vehicle.

[0013] As shown in Figure 1, the vehicle 10 (corresponding to the "mobile body") is equipped with a high-voltage battery 20 (corresponding to the "powered device"), an electrical device 30, and a low-voltage battery 40 (corresponding to the "power source"). The electrical device 30 is equipped with AC terminals and DC terminals. The AC terminals of the electrical device 30 are connected to an external charging device 50 located outside the vehicle 10. The DC terminals of the electrical device 30 are connected to the high-voltage battery 20 installed in the vehicle 10. The electrical device 30 has the function of converting AC power input via the AC terminals into DC power and outputting it from the DC terminals. The DC power output from the DC terminals is supplied to the high-voltage battery 20 installed in the vehicle 10.

[0014] The high-voltage storage battery 20 is a storage battery with a higher rated voltage than the low-voltage storage battery 40. In this embodiment, the high-voltage storage battery 20 is, for example, a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery.

[0015] As shown in Figure 2, the vehicle 10 is equipped with a power switch 41, a charging ECU 80, and a higher-level ECU 90. The charging ECU 80 and the higher-level ECU 90 are connected to the low-voltage battery 40. The charging ECU 80 communicates with the higher-level ECU 90. Based on the communication from the charging ECU 80, the higher-level ECU 90 switches the power switch 41 on and off. In this embodiment, the charging ECU 80 corresponds to the "switch control unit".

[0016] The electrical device 30 includes a power control device 150. The power control device 150 is connected to a low-voltage battery 40 via a power switch 41. When the power switch 41 is turned on, power is supplied from the low-voltage battery 40 to the power control device 150. The rated voltage of the low-voltage battery 40 is, for example, 12V. The low-voltage battery 40 is a rechargeable battery, such as a lead-acid battery.

[0017] As shown in Figure 1, the external charging device 50 includes a single-phase AC power supply 60 and an external control device 70. The single-phase AC power supply 60 is connectable to the electrical device 30. When the single-phase AC power supply 60 and the electrical device 30 of the vehicle 10 are connected via a charging cable 61, the external control device 70 communicates with the charging ECU 80 of the connected vehicle 10. Based on the communication with the charging ECU 80, the single-phase AC power supply 60 supplies power to the connected electrical device 30.

[0018] As shown in Figure 2, the electrical device 30 includes a first electrical path 101, a second electrical path 102, and a switching power supply 140. The first ends of the first and second electrical paths 101 and 102 are provided with first and second input terminals 101a and 102a, which are AC terminals of the electrical device 30. The single-phase AC power supply 60 of the external charging device 50 is connected to the first and second input terminals 101a and 102a. The input terminals of the switching power supply 140 are connected to the second ends of the first and second electrical paths 101 and 102.

[0019] The output section of the switching power supply 140 is provided with first and second output sections 101b and 102b, which are the DC terminals of the electrical device 30. The positive terminal of the high-voltage battery 20 is connected to the first output section 101b. The negative terminal of the high-voltage battery 20 is connected to the second output section 102b.

[0020] The electrical device 30 includes first, second, and third Y capacitors 110, 120, and 130, and an X capacitor 160. The first, second, and third Y capacitors 110, 120, and 130 are connected to the first electrical path 101 and the second electrical path 102.

[0021] The first, second, and third Y capacitors 110, 120, and 130 are connected in series with the first capacitors 111, 121, and 131 and the second capacitors 112, 122, and 132. The first terminals of the first capacitors 111, 121, and 131 are connected to the first electrical path 101. The second terminals of the first capacitors 111, 121, and 131 are connected to the first terminals of the second capacitors 112, 122, and 132. The second terminals of the second capacitors 112, 122, and 132 are connected to the second electrical path 102. The second terminals of the first capacitors 111, 121, and 131 and the first terminals of the second capacitors 112, 122, and 132 are connected to ground. The X capacitor 160 is connected to the first electrical path 101 and the second electrical path 102. The first, second, and third Y capacitors 110, 120, and 130, and the X capacitor 160 are connected in parallel to the single-phase AC power supply 60.

[0022] The electrical device 30 includes a first common mode choke coil 200 and a second common mode choke coil 210. The first and second common mode choke coils 200 and 210 are provided in the first electrical path 101 and the second electrical path 102.

[0023] The first and second common-mode choke coils 200 and 210 are composed of a first coil 201 and 211 and a second coil 202 and 212. In the first common-mode choke coil 200, the first coil 201 is provided between the connection portion with the first Y capacitor 110 and the connection portion with the second Y capacitor 120 in the first electrical path 101. In the first common-mode choke coil 200, the second coil 202 is provided between the connection portion with the first Y capacitor 110 and the connection portion with the second Y capacitor 120 in the second electrical path 102. In the second common-mode choke coil 210, the first coil 211 is provided between the connection portion with the second Y capacitor 120 and the connection portion with the third Y capacitor 130 in the first electrical path 101. In the second common-mode choke coil 210, the second coil 212 is provided between the connection portion with the second Y capacitor 120 and the connection portion with the third Y capacitor 130 in the second electrical path 102.

[0024] The switching power supply 140 includes a power factor correction circuit 141, a smoothing capacitor 164, and a DC-DC converter 142. The input of the power factor correction circuit 141 (i.e., the input of the switching power supply 140) is connected to the first electrical path 101 and the second electrical path 102. The power factor correction circuit 141 converts the AC voltage supplied from the single-phase AC power supply 60 into a DC voltage. The DC voltage converted by the power factor correction circuit 141 is input to the DC-DC converter 142 via the smoothing capacitor 164. The DC-DC converter 142 is, for example, an isolated DC-DC converter, and transforms the input DC voltage and outputs it to the first output unit 101b. This charges the high-voltage storage battery 20.

[0025] The first, second, and third Y capacitors 110, 120, and 130, the X capacitor 160, the precharge switch 161, the precharge resistor 162, the main switch 163, and the first and second common-mode choke coils 200 and 210 constitute the AC filter. The AC filter and the switching power supply 140 constitute the charger 100.

[0026] The power control device 150 is an electronic control unit (ECU) that performs various controls on the charger 100, and comprises a processor 151 as hardware, a memory unit 152, and a communication bus 153 connecting the processor 151 and the memory unit 152. The charging ECU 80 is an electronic control unit (ECU) that performs various controls on in-vehicle equipment, including the power control device 150, and comprises a processor 81 as hardware, a memory unit 82, and a communication bus 83 connecting the processor 81 and the memory unit 82. Furthermore, the charging ECU 80 is capable of exchanging information with a higher-level ECU 90 and an external control device 70 of an external charging device 50 connected to the vehicle 10.

[0027] The memory units 82 and 152 include memory and storage as hardware. The memory is a storage device for storing data used in the processing of the charging ECU 80 and the power control device 150. The memory provides the processors 81 and 151 with a temporary workspace for use when they perform processing. The memory includes, for example, ROM or RAM. The storage is a storage device that stores various programs and data for the processors 81 and 151 to read and execute, and is a non-transitory tangible storage medium. The storage includes, for example, an HDD or flash memory. The storage stores program information and the like for processing described later.

[0028] For example, program information stored on a non-transitional physical recording medium is installed in the storage units 82 and 152. The recording medium is, for example, a USB memory stick, a CD-ROM, or a DVD. In addition, program information transmitted via a communication network, such as OTA (Over The Air), is installed in the storage units 82 and 152.

[0029] The charger 100 includes a main switch 163, a precharge switch 161, and a precharge resistor 162. In this embodiment, the main switch 163 and the precharge switch 161 are normally-off switches, such as relays (specifically, mechanical relays) or semiconductor switching elements. The main switch 163 and the precharge switch 161 are controlled by a power control device 150. To maintain the ON state of the main switch 163 and the precharge switch 161, power is supplied from the low-voltage battery 40 to the control terminals of the main switch 163 and the precharge switch 161 via the power switch 41 and the power control device 150. For example, if the switch is a mechanical relay, the control terminal is a coil for opening and closing the contacts.

[0030] The main switch 163 is located on the side of the first and second input sections 101a and 102a of the second electrical path 102, beyond the connection points to the X capacitor 160 and the second and third Y capacitors 120 and 130. The main switch 163 is also located on the side of the switching power supply 140 beyond the connection point to the first Y capacitor 110. The precharge switch 161 and the precharge resistor 162 are connected in series, and this series connection is connected in parallel to the main switch 163.

[0031] When the vehicle 10 and the external charging device 50 are connected via a charging cable 61, the external control device 70 and the charging ECU 80 communicate, for example, whether power is being supplied from the vehicle 10's low-voltage battery 40 to the power control device 150. If the charging ECU 80 determines that the power control device 150 is not receiving power (i.e., the power switch 41 is in the off state), it sends a command to the higher-level ECU 90 to turn on the power switch 41. Upon receiving the command to turn on the power switch 41, the higher-level ECU 90 switches the power switch 41 to the ON position. As a result, power is supplied from the low-voltage battery 40 to the power control device 150.

[0032] The power control device 150 supplies power from the single-phase AC power supply 60 to the high-voltage storage battery 20 by issuing control commands to the charger 100 based on commands from the charging ECU 80. This control will be explained below using the flowchart in Figure 3 and the time chart in Figure 4. In Figure 4, (a) shows the control state of the power switch 41, (b) shows the control command state from the charging ECU 80 to the power control device 150, (c) shows the control state of the power control device 150 and the switching power supply 140, (d) shows the control state of the external charging device 50, (e) shows the control state of the pre-charge switch 161, and (f) shows the control state of the main switch 163.

[0033] In step S10, the power switch 41 is switched on by the higher-level ECU 90. In this case, the low-voltage battery 40 is connected to the power control device 150, and power is supplied from the low-voltage battery 40 to the power control device 150. The process in step S10 corresponds to the timing t1 in Figure 4(a) when the power switch 41 is switched on.

[0034] In the following step S11, the charging ECU 80 determines whether it is time to transition to the operation preparation mode. For example, if the charging ECU 80 determines that it is time to transition to the operation preparation mode, it should determine that it is time to transition to the operation preparation mode when it determines that communication with the external control device 70 has become possible.

[0035] When the charging ECU 80 determines that it is time to transition to the operation preparation mode, it proceeds to step S12 and sends an operation preparation command to the power control device 150, which is a command to make switching control possible. The process in step S12 corresponds to the timing t2 in Figure 4(b) when the control command switches from off to standby. Upon receiving the operation preparation command, the power control device 150 becomes capable of switching control of the switching power supply 140. The power control device 150 transmits to the charging ECU 80 that it is now capable of switching control. This transmission process corresponds to the timing t3 in Figure 4(c) when the operating state switches from off to standby.

[0036] In the following step S13, the charging ECU 80 instructs the power control device 150 to switch the precharge switch 161 to ON. The process in step S13 corresponds to the timing t3 in Figure 4(e) when the precharge switch 161 is switched ON.

[0037] In the following step S14, the charging ECU 80 determines whether or not it is time to transition to the charging operation mode. The charging operation mode is a mode in which the power control device 150 sends a switching control start command to the switching power supply 140.

[0038] When the charging ECU 80 determines that it is time to transition to the charging operation mode, it proceeds to step S15 and sends a switching control start command to the power control device 150. The process in step S15 corresponds to the timing t4 in Figure 4(b) when the control command switches from standby to charge. The charging ECU 80 also sends a command to the external control device 70 of the external charging device 50 to apply the voltage of the single-phase AC power supply 60 to the first electrical path 101 and the second electrical path 102. As a result, the voltage of the single-phase AC power supply 60 begins to be applied to the first electrical path 101 and the second electrical path 102, as shown at timing t5 in Figure 4(d).

[0039] The power control device 150 receives a command to start switching control from the charging ECU 80. In this case, as shown at timing t6 in Figure 4(c), the power control device 150 transmits to the charging ECU 80 that it will start switching control of the switching power supply 140 and starts the switching control. As a result, the power that was supplied from the single-phase AC power supply 60 to the first electrical path 101 and the second electrical path 102 is supplied to the high-voltage battery 20 via the switching power supply 140. Consequently, the high-voltage battery 20 is charged.

[0040] In the following step S17, the charging ECU 80 instructs the power control device 150 to switch the main switch 163 to ON, as shown at timing t7 in Figure 4(f). The charging ECU 80 then instructs the power control device 150 to switch the precharge switch 161 to OFF, as shown at timing t8 in Figure 4(e). Note that the timing at which the main switch 163 is switched ON and the timing at which the precharge switch 161 is switched OFF may be the same.

[0041] Figure 5 shows the current flow pattern when a single-phase AC power supply 60 is connected to a charger 100 and power is supplied from the single-phase AC power supply 60 to an AC filter.

[0042] As shown in FIG. 5, the charging ECU 80 transmits a command to switch the pre-charge switch 161 to on to the power supply control device 150 at a timing before power is supplied from the single-phase AC power supply 60 to the AC filter. In this case, a closed circuit including the single-phase AC power supply 60, the first electrical path 101, the X capacitor 160, the second electrical path 102, and the pre-charge resistor 162 is formed. As a result, current flows through the closed circuit formed from the single-phase AC power supply 60.

[0043] The effects of the present embodiment will be described using FIG. 6. In FIG. 6, (a) shows the control state of the pre-charge switch 161, (b) shows the control state of the external charging device 50, and (c) shows the control state of the main switch 163. Further, (d) shows the transition of the voltage applied from the single-phase AC power supply 60 to the charger 100, and (e) shows the transition of the leakage current flowing from the second and third Y capacitors 120 and 130 to the ground. Note that the case where the voltage on the first electrical path 101 side is higher than the voltage on the second electrical path 102 side is defined as positive for the voltage output from the single-phase AC power supply 60. Also, the case where the leakage current flowing from the second and third Y capacitors 120 and 130 to the ground flows from the second and third Y capacitor 120 and 130 sides to the ground side is defined as positive.

[0044] As shown in FIG. 6(a), the charging ECU 80 switches the pre-charge switch 161 to on at the timing t1 before applying a voltage from the single-phase AC power supply 60 to the charger 100. As shown in FIG. 6(b), at the timing t2, the external control device 70 receives a command to be applied to the charger 100 from the charging ECU 80, and as shown in FIG. 6(d), a voltage starts to be applied from the single-phase AC power supply 60 to the charger 100. Also, as shown in FIG. 6(e), along with the start of voltage application to the charger 100, leakage current starts to flow from the second and third Y capacitors 120 and 130 to the ground.

[0045] Here, since the pre-charge switch 161 is turned on, a part of the current flowing to the ground through each Y capacitor 120, 130 flows into a closed circuit including the single-phase AC power supply 60, the first electrical path 101, the second Y capacitor 120, the pre-charge resistor 162, and the second electrical path 102. Therefore, the leakage current flowing to the ground through each Y capacitor 120, 130 can be suppressed.

[0046] As shown in FIG. 6(c), the charging ECU 80 transmits a command to turn on the main switch 163 at timing t4. Also, as shown in FIG. 6(a), the charging ECU 80 transmits a command to turn off the pre-charge switch 161 at timing t5.

[0047] FIG. 7 is a time chart of a comparative example different from the present embodiment. FIGS. 7(a) to (e) correspond to FIGS. 6(a) to (e) above. As shown in FIG. 7(a), the control device of the comparative example switches the pre-charge switch 161 to on at timing t3 after applying a voltage from the single-phase AC power supply 60 to the charger 100. In this case, during the period from when the voltage is applied until the pre-charge switch 161 is switched to on (that is, t2 to t3), both the pre-charge switch 161 and the main switch 163 are off, and a closed circuit including the single-phase AC power supply 60, the first electrical path 101, and the second electrical path 102 is not formed. Therefore, as shown in FIG. 7(e), the leakage current becomes larger than in the present embodiment. In the case of the comparative example, in order to suppress the leakage current, it is necessary to increase the inductance of each common mode choke coil 200, 210, so each common mode choke coil 200, 210 becomes larger.

[0048] According to the present embodiment described above, the following effects can be obtained.

[0049] The charging ECU 80 switches the precharge switch 161 to ON at the timing before applying voltage from the single-phase AC power supply 60 to the first electrical path 101 and the second electrical path 102. This forms a closed circuit including the single-phase AC power supply 60, the first electrical path 101, the second Y capacitor 120, the second electrical path 102, and the precharge resistor 162. Another closed circuit is formed including the single-phase AC power supply 60, the first electrical path 101, the third Y capacitor 130, the second electrical path 102, and the precharge resistor 162. As a result, a portion of the current flowing to ground through each Y capacitor 120, 130 flows into the formed closed circuit. Therefore, leakage current flowing from the second and third Y capacitors 120, 130 to ground can be suppressed. Furthermore, in order to suppress leakage current, the configuration necessary to suppress the inrush current to the smoothing capacitor 164 is reused. In other words, the simplified configuration makes it possible to suppress leakage current flowing from the second and third Y capacitors 120 and 130 to ground without increasing the inductance of each common-mode choke coil 200 and 210.

[0050] In Figure 4, the timing t4 at which the start command for switching control is transmitted from the charging ECU 80 is close to the timing t5 at which voltage is first applied from the external charging device 50 to the charger 100. In this case, even if the power control device 150 attempts to switch the precharge switch 161 to ON at timing t4, there is a concern that the switch will not be completed in time for timing t5, and the effect of suppressing leakage current will not be obtained. For this reason, the charging ECU 80 switches the precharge switch 161 to ON before timing t4. This allows the precharge switch 161 to be switched ON earlier than timing t5, and the effect of suppressing leakage current can be accurately obtained.

[0051] To maintain the ON state of the normally-off type precharge switch 161, power supply from the low-voltage battery 40 is required. The longer the precharge switch 161 remains ON, the greater the power consumption required to maintain the ON state. To reduce power consumption, it is desirable that the timing of switching the precharge switch 161 to ON is close to the timing (timing t5 in Figure 4) when voltage is applied from the single-phase AC power supply 60 to the first electrical path 101 and the second electrical path 102. On the other hand, if the control command for switching the precharge switch 161 to ON is too late, as described above, there is a concern that the timing of switching the precharge switch 161 to ON will not be in time for timing t5 in Figure 4.

[0052] Therefore, the charging ECU 80 transmits an ON switching control command to the precharge switch 161 at an intermediate timing between timing t1 and timing t4, and switches the precharge switch 161 ON at timing t3. This makes it possible to reduce power consumption while effectively suppressing leakage current.

[0053] <Other Embodiments> The above embodiments may be modified and implemented as follows.

[0054] The main switch 163 may be provided in the first electrical path 101 instead of the second electrical path 102. The series connection of the precharge switch 161 and the precharge resistor 162 is connected in parallel to the main switch 163 provided in the first electrical path 101.

[0055] The timing at which the charging ECU 80 switches the precharge switch 161 to ON can be any timing within the specific period tok from timing t1 to t5 in Figure 4.

[0056] For example, the charging ECU 80 may switch the precharge switch 161 to the ON position at any timing (for example, timing t2) during the period from timing t1 to timing t3 when the power switch 41 is switched ON.

[0057] Alternatively, for example, the charging ECU 80 may switch the precharge switch 161 to ON at any timing (for example, timing t4) during the period from immediately after timing t3 to timing t4.

[0058] Furthermore, for example, the charging ECU 80 may switch the precharge switch 161 to ON at any timing between immediately after timing t4 and immediately before timing t5.

[0059] The Y capacitor located at the connection point on the output side of the main switch may be one or three or more.

[0060] The entity implementing this disclosure is not limited to the charging ECU 80. For example, the functions of the charging ECU 80 may be integrated into the power control device 150 or the higher-level ECU 90. In this case, the power control device 150 or the higher-level ECU 90 will include a "switch control unit".

[0061] The mobile body on which the electrical device is mounted is not limited to a vehicle; for example, it could be an aircraft or a ship. Furthermore, the mounting location of the electrical device is not limited to a mobile body; it could be a stationary device.

[0062] In this disclosure or claims, the term "processor" means one or more hardware processors configured to execute processing defined by computer program code (i.e., one or more instructions of a computer program) contained in a computer program by reading the computer program code each time. In other words, a "processor" is a hardware device that executes one or more programmed processes. Therefore, computer program code can also be said to be software that can define the processing of the processor according to its content. A "processor" can be a general-purpose or specific-purpose processor, and may be, but is not limited to, a CPU, microprocessor, GPU, and DFP (Data Flow Processor).

[0063] In this disclosure or claims, the term “memory” means one or more hardware memories that are non-transitional tangible recording media configured to record computer program code and / or data in a manner accessible from a processor. “Memory” can be implemented by memory technology such as SRAM, SDRAM, non-volatile / flash type memory, or other types of memory. The computer program code that constitutes the program is recorded in memory and executed by a processor, thereby enabling the processor to perform the various functions described above.

[0064] In this disclosure or claims, the term “circuit” refers to one or more logic circuits as hardware, configured to perform specific processing defined by a pre-designed circuit configuration. In other words (and, in contrast to “processor”), “circuit” in this disclosure or claims refers to a hardware device that performs specific processing based on a circuit configuration, rather than processing defined by software such as the computer program code described above. For example, “circuit” may include custom ICs such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field Programmable Gate Arrays) designed with Hardware Description Language (HDL). That is, “circuit” in this disclosure or claims includes all hardware circuits except for the processors described above that perform processing by reading computer program code.

[0065] In this disclosure or claims, the expression "at least one of the circuit and processor" should be interpreted as disjunctive (logical OR) and not as "at least one circuit and at least one processor." Therefore, in this disclosure or claims, "at least one of the circuit and processor causes the control device to perform functions" includes cases where the circuit alone causes the control device to perform all functions. Also, "at least one of the circuit and processor causes the control device to perform functions" includes cases where the processor alone causes the control device to perform all functions. Furthermore, "at least one of the circuit and processor causes the control device to perform functions" includes cases where the circuit causes the control device to perform some functions and the processor causes the control device to perform the remaining functions. In the last example, for example, if the control device performs functions A to C, functions A and B may be implemented by the circuit, and the remaining function C may be implemented by the processor.

[0066] This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure.

Claims

1. An electrical device (30) provided on a mobile body (10), wherein the control device (80) of the electrical device supplies power input from an AC power source (60) to a power supply target device (20) provided on the mobile body, wherein the electrical device comprises: a first electrical path (101); a second electrical path (102); an X capacitor (160) connecting the first electrical path and the second electrical path; a Y capacitor (120, 130) connecting the second electrical path and the second electrical path; a series connection of a precharge switch (161) and a precharge resistor (162); a main switch (163) connected in parallel to the series connection; and a switching power supply (140) having a smoothing capacitor (164), wherein the AC power source is connected to the input section (101a) of the first electrical path and the input section (102a) of the second electrical path. A control device for an electrical device, wherein the powered device is connected to the output section (101b) of the first electrical path and the output section (102b) of the second electrical path via the switching power supply, a ground is connected to the connection portion of the first capacitor (121, 131) and the second capacitor (122, 132) that constitute the Y capacitor, the main switch is provided on the AC power supply side of the first electrical path and the second electrical path than the connection portion with the Y capacitor, and the control device for an electrical device includes a switch control unit that switches the precharge switch ON at a timing before the voltage of the AC power supply is applied to the first electrical path and the second electrical path.

2. The control device for an electrical device according to claim 1, wherein the mobile body is provided with a power supply (40), the electrical device is provided with a power control device (150) that controls the switching power supply, the power control device is configured to be operable by being powered from the power supply and uses the power supplied from the power supply to switch the precharge switch ON, and the switch control unit switches the precharge switch ON at a timing after the start of power supply from the power supply to the power control device.

3. The control device for an electrical device according to claim 2, wherein the switch control unit, after starting to supply power from the power source to the power control device, determines that the electrical device is in an operation preparation mode, transmits an operation preparation command to the switching power supply, which is a command to put the switching power supply into a state where switching control can be executed; after transmitting the operation preparation command to the switching power supply, determines that the electrical device is in a charging operation mode, transmits a switching control start command to the switching power supply to start charging the power supply target device; and when the voltage of the AC power supply is applied to the first electrical path and the second electrical path, the switching control is started.

4. The control device for an electrical device according to claim 3, wherein the switch control unit switches the precharge switch to ON at a timing after the timing of transmitting the operation preparation command.

5. The control device for an electrical device according to claim 4, wherein the switch control unit switches the precharge switch to ON at a timing after the timing at which the switching power supply receives the operation preparation command.

6. The control device for an electrical device according to claim 5, wherein the switch control unit switches the precharge switch ON at the timing when the switching power supply receives the operation preparation command and the switching control becomes executable.

7. The control device for an electrical device according to any one of claims 3 to 5, wherein the switch control unit switches the precharge switch to ON at a timing prior to the timing of transmitting the switching control start command.

8. In a program applied to an electrical device (30) provided on a mobile body (10) that supplies power input from an AC power source (60) to a powered device (20) provided on the mobile body, the electrical device comprises: a first electrical path (101); a second electrical path (102); an X capacitor (160) connecting the first electrical path and the second electrical path; a Y capacitor (120, 130) connecting the second electrical path and the second electrical path; a series connection of a precharge switch (161) and a precharge resistor (162); a main switch (163) connected in parallel to the series connection; and a switching power supply (140) having a smoothing capacitor (164), wherein the AC power source is connected to the input section (101a) of the first electrical path and the input section (102a) of the second electrical path. The powered device is connected to the output section (101b) of the first electrical path and the output section (102b) of the second electrical path via the switching power supply; ground is connected to the connection portion of the first capacitor (121, 131) and the second capacitor (122, 132) that constitute the Y capacitor; the main switch is provided on the AC power supply side of the first electrical path and the second electrical path, closer to the connection portion with the Y capacitor; and a program causes at least one of the circuit and the processor (81) to execute a process to switch the precharge switch ON at a timing before the voltage of the AC power supply is applied to the first electrical path and the second electrical path.

9. A control method for an electrical device (30) provided on a mobile body (10) that supplies power input from an AC power source (60) to a power supply target device (20) provided on the mobile body, wherein the electrical device comprises: a first electrical path (101); a second electrical path (102); an X capacitor (160) connecting the first electrical path and the second electrical path; a Y capacitor (120, 130) connecting the second electrical path and the second electrical path; a series connection of a precharge switch (161) and a precharge resistor (162); a main switch (163) connected in parallel to the series connection; and a switching power supply (140) having a smoothing capacitor (164), wherein the AC power source is connected to the input section (101a) of the first electrical path and the input section (102a) of the second electrical path. A method for controlling an electrical device, wherein the powered device is connected to the output section (101b) of the first electrical path and the output section (102b) of the second electrical path via the switching power supply, a ground is connected to the connection portion of the first capacitor (121, 131) and the second capacitor (122, 132) that constitute the Y capacitor, the main switch is provided on the AC power supply side of the first electrical path and the second electrical path, closer to the connection portion with the Y capacitor, and at least one of the circuit and the processor (81) is instructed to perform the step of switching the precharge switch ON at a timing before the voltage of the AC power supply is applied to the first electrical path and the second electrical path.

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