US 10,897,190 B2 · Power supply device, power control apparatus, and relay determination method for power supply device

Abstract

A storage device that includes a first switching circuit connected to a direct-current voltage bus and a second switching circuit connected between the first switching circuit and a DC-DC converter. A smoothing capacitor is connected between the DC-DC converter and the switching circuit. Moreover, the second switching circuit includes a pair of relays connected in series between the first switching circuit and the DC-DC converter and an inrush current prevention circuit connected in parallel with the series circuit of the relays. A first voltage sensor is connected to a node between the pair of relays and a second voltage sensor is connected between both terminals of the smoothing capacitor. A control unit determines the presence of welding at the relays on the basis of voltage values detected by the voltage sensors.

Claims20

Dependent claims

A power supply device comprising:

a direct-current power supply;
a first switching circuit configured to couple the direct-current power supply to an object and to separate the direct-current power supply from the object;
a second switching circuit that includes a series circuit including a first relay and a second relay connected in series between the first switching circuit and the direct-current power supply, and a first inrush current prevention circuit connected in parallel with the series circuit;
a first capacitor connected between the direct-current power supply and the second switching circuit;
a first voltage sensor configured to detect a voltage between a low-voltage-side terminal of the first capacitor and a node between the first and second relays;
a second voltage sensor configured to detect a voltage between the low-potential-side terminal and a high-potential-side terminal of the first capacitor;
and
a control unit configured to control the first switching circuit and the second switching circuit.

5 more elements

A power control apparatus that converts a direct-current voltage input from a power generator into an alternating-current voltage, the power control apparatus comprising:

a direct-current voltage bus that receives a direct-current voltage input from the power generator;
an inverter configured to convert a direct-current voltage of the direct-current voltage bus into an alternating-current voltage;
and
a power supply device coupled to the direct-current voltage bus and including:
a direct-current power supply,
a first switching circuit configured to couple the direct-current power supply to the direct-current voltage bus and to separate the direct-current power supply from the direct-current voltage bus,
a second switching circuit that includes a series circuit including a first relay and a second relay connected in series between the first switching circuit and the direct-current power supply, and a first inrush current prevention circuit connected in parallel with the series circuit,
a first capacitor connected between the direct-current power supply and the second switching circuit,
a first voltage sensor configured to detect a voltage between a low-voltage-side terminal of the first capacitor and a node between the first and second relays,
a second voltage sensor configured to detect a voltage between the low-potential-side terminal and a high-potential-side terminal of the first capacitor, and
a control unit configured to control the first switching circuit and the second switching circuit.

8 more elements

A power supply device relay determination method for a power supply device that includes a direct-current power supply, a first switching circuit configured to couple the direct-current power supply with an object and to separate the direct-current power supply from the object, a second switching circuit having a series circuit including first and second relays connected in series between the first switching circuit and the direct-current power supply, and a first inrush current prevention circuit connected in parallel with the series circuit, a first capacitor connected between the direct-current power supply and the second switching circuit, a first voltage sensor that detects a voltage between a low-voltage-side terminal of the first capacitor and a node between the first relay and the second relay, and a second voltage sensor that detects a voltage between the low-potential-side terminal and a high-potential-side terminal of the first capacitor, the power supply device relay determination method comprising:

opening and closing the first relay and the second relay by a control unit;
and
determining a presence of welding at the first relay and the second relay based on a first voltage value detected by the first voltage sensor and a second voltage value detected by the second voltage sensor.

Dependencies are inferred from the claim text.

Power supply device, power control apparatus, and relay determination method for power supply device

Life of this patent

Power supply device, power control apparatus, and relay determination method for power supply device

Life of this patent

Abstract

Claims20