Switching power source device, vehicle, and control method

1. A switching power source device comprising:

a plurality of power source circuits corresponding to phases of a polyphase alternating-current power source being an external power source, each of the plurality of power source circuits including a power factor improvement circuit including an inductor, a switching element, and a diode, the plurality of power source circuits including a first power source circuit corresponding to a first phase of the external power source, and a second power source circuit corresponding to a second phase of the external power source that is different from the first phase;

a first switching circuit capable of switching between a plurality of connection modes including a first mode of connecting the second power source circuit to the first phase in parallel with the first power source circuit, and a second mode of connecting the second power source circuit to the second phase;

a memory; and

a hardware processor coupled to the memory, the hardware processor being configured to:

open and close a switching element included in the first power source circuit and a switching element included in the second power source circuit, in different phases in the first mode; and

operate the switching element of the first power source circuit and the switching element of the second power source circuit with a phase difference of 180 degrees in a case where the hardware processor controls the first switching circuit to be in the first mode.

2. The switching power source device according to claim 1 , wherein the hardware processor further configured to switch the first switching circuit between the first mode and the second mode in accordance with a number of phases of an external power source connected to the switching power source device.

3. The switching power source device according to claim 2 , wherein the hardware processor is configured to switch the first switching circuit to the first mode in a case where a single-phase alternating-current power source is connected to the switching power source device.

4. The switching power source device according to claim 2 , wherein

each of the plurality of power source circuits further includes a voltmeter, and

the hardware processor is configured to determine the number of phases of the external power source connected to the switching power source device, based on a voltage value measured by the voltmeter.

5. The switching power source device according to claim 2 , wherein

the plurality of power source circuits further includes a third power source circuit including a power factor improvement circuit including an inductor, a switching element, and a diode, and corresponding to a third phase of the external power source that is different from the first phase and the second phase, and

the switching power source device further comprising a second switching circuit configured to switch whether to connect the third power source circuit in parallel with the first power source circuit and the second power source circuit, or connect the third power source circuit to the third phase.

6. The switching power source device according to claim 5 , wherein the hardware processor is configured to control the second switching circuit to connect the third power source circuit to the first phase in parallel with the first power source circuit and the second power source circuit in a case where a single-phase alternating-current power source is connected to the switching power source device.

7. The switching power source device according to claim 6 , wherein the hardware processor is configured to control the first switching circuit and the second switching circuit at different timings.

8. The switching power source device according to claim 5 , wherein the hardware processor is configured to operate the switching element of the first power source circuit, the switching element of the second power source circuit, and the switching element of the third power source circuit with a phase difference of 120 degrees in a case where the hardware processor controls the first switching circuit to be in the first mode, and controls the second switching circuit to connect the third power source circuit in parallel with the first power source circuit and the second power source circuit.

9. The switching power source device according to claim 1 , wherein

each of the plurality of power source circuits further includes a filter circuit, and

the filter circuit is provided between the external power source and the power factor improvement circuit.

10. A vehicle comprising a switching power source device, the switching power source device including:

a plurality of power source circuits corresponding to phases of a polyphase alternating-current power source being an external power source, each of the plurality of power source circuits including a power factor improvement circuit including an inductor, a switching element, and a diode, the plurality of power source circuits including a first power source circuit corresponding to a first phase of the external power source, and a second power source circuit corresponding to a second phase of the external power source that is different from the first phase;

a first switching circuit capable of switching between a plurality of connection modes including a first mode of connecting the second power source circuit to the first phase in parallel with the first power source circuit, and a second mode of connecting the second power source circuit to the second phase;

a memory; and

a hardware processor coupled to the memory, the hardware processor being configured to:

open and close a switching element included in the first power source circuit and a switching element included in the second power source circuit, in different phases in the first mode; and

operate the switching element of the first power source circuit and the switching element of the second power source circuit with a phase difference of 180 degrees in a case where the hardware processor controls the first switching circuit to be in the first mode.

11. A control method to be executed by a switching power source device including a plurality of power source circuits and a first switching circuit,

the plurality of power source circuits corresponding to phases of a polyphase alternating-current power source being an external power source,

each of the plurality of power source circuits including a power factor improvement circuit including an inductor, a switching element, and a diode, and the plurality of power source circuits including a first power source circuit corresponding to a first phase of the external power source, and a second power source circuit corresponding to a second phase of the external power source that is different from the first phase,

the first switching circuit being capable of switching between a plurality of connection modes including a first mode of connecting the second power source circuit to the first phase in parallel with the first power source circuit, and a second mode of connecting the second power source circuit to the second phase,

the control method comprising:

opening and closing a switching element included in the first power source circuit and a switching element included in the second power source circuit, in different phases in the first mode; and

operating the switching element of the first power source circuit and the switching element of the second power source circuit with a phase difference of 180 degrees in a case where the first switching circuit is in the first mode.