POWER SUPPLY DEVICE AND SWITCH CONTROL METHOD THEREFOR
First Claim
1. A power supply device comprising:
- an AC path from an input end to an output end in the power supply device;
a current sensor configured to detect a current flowing through the AC path;
a conversion unit connected to the AC path and being capable of bidirectional power conversion;
a storage battery connected to the AC path via the conversion unit;
an AC switch provided between the input end and a point at which the conversion unit is connected to the AC path, the AC switch including a relay contact and a semiconductor switch connected in parallel to the relay contact; and
a control unit configured to control the conversion unit and the AC switch, thereby having a current conduction mode in which a power is supplied from the input end through the AC switch which is closed and the AC path, to reach the output end and thus supplied to a load connected to the output end, and a storage battery discharge mode in which the AC switch is opened and a power is supplied from the storage battery to the load via the conversion unit, whereinwhen the current conduction mode is activated for the first time, and when the current sensor detects an excessive current during the current conduction mode, the control unit closes only the relay contact while keeping the semiconductor switch opened.
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Accused Products
Abstract
This power supply device includes: an AC path from an input end to an output end; a current sensor configured to detect a current flowing through the AC path; a conversion unit connected to the AC path and being capable of bidirectional power conversion; a storage battery connected to the AC path via the conversion unit; an AC switch provided between the input end and a point at which the conversion unit is connected to the AC path, the AC switch including parallel body of a relay contact and a semiconductor switch; and a control unit configured to control the conversion unit and the AC switch. When the control unit executes a current conduction mode for the first time, and when the current sensor detects an excessive current during the current conduction mode, the control unit closes only the relay contact while keeping the semiconductor switch opened.
4 Citations
10 Claims
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1. A power supply device comprising:
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an AC path from an input end to an output end in the power supply device; a current sensor configured to detect a current flowing through the AC path; a conversion unit connected to the AC path and being capable of bidirectional power conversion; a storage battery connected to the AC path via the conversion unit; an AC switch provided between the input end and a point at which the conversion unit is connected to the AC path, the AC switch including a relay contact and a semiconductor switch connected in parallel to the relay contact; and a control unit configured to control the conversion unit and the AC switch, thereby having a current conduction mode in which a power is supplied from the input end through the AC switch which is closed and the AC path, to reach the output end and thus supplied to a load connected to the output end, and a storage battery discharge mode in which the AC switch is opened and a power is supplied from the storage battery to the load via the conversion unit, wherein when the current conduction mode is activated for the first time, and when the current sensor detects an excessive current during the current conduction mode, the control unit closes only the relay contact while keeping the semiconductor switch opened. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10)
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6. A switch control method for a power supply device that includes:
- an AC path from an input end to an output end in the power supply device;
a current sensor configured to detect a current flowing through the AC path;
a conversion unit connected to the AC path and being capable of bidirectional power conversion;
a storage battery connected to the AC path via the conversion unit;
an AC switch provided between the input end and a point at which the conversion unit is connected to the AC path, the AC switch including a relay contact and a semiconductor switch connected in parallel to the relay contact; and
a control unit configured to control the conversion unit and the AC switch, the switch control method being executed by the control unit, whereinthe control unit executes a current conduction mode in which a power is supplied from the input end through the AC switch which is closed and the AC path, to reach the output end and thus supplied to a load connected to the output end, and a storage battery discharge mode in which the AC switch is opened and a power is supplied from the storage battery to the load via the conversion unit, and when the current conduction mode is activated for the first time, and when the current sensor detects an excessive current during the current conduction mode, the control unit closes only the relay contact while keeping the semiconductor switch opened.
- an AC path from an input end to an output end in the power supply device;
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7. A power supply device comprising:
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an AC path from an input end to an output end in the power supply device; a current sensor configured to detect a current flowing through the AC path; a conversion unit connected to the AC path and being capable of bidirectional power conversion; a storage battery connected to the AC path via the conversion unit; an AC switch provided between the input end and a point at which the conversion unit is connected to the AC path, the AC switch including a relay contact and a semiconductor switch connected in parallel to the relay contact; and a control unit configured to control the conversion unit and the AC switch, thereby having a current conduction mode in which a power is supplied from the input end through the AC switch which is closed and the AC path, to reach the output end and thus supplied to a load connected to the output end, and a storage battery discharge mode in which the AC switch is opened and a power is supplied from the storage battery to the load via the conversion unit, wherein an operation in which closing of the semiconductor switch, opening of the relay contact, and then opening of the semiconductor switch are performed in this order is defined as an OFF sequence, and an operation in which closing of the semiconductor switch, closing of the relay contact, and then opening of the semiconductor switch are performed in this order is defined as an ON sequence, and in operating the AC switch, (a) when the current conduction mode is activated for the first time, the control unit closes only the relay contact while avoiding the ON sequence, (b) when shifting to the storage battery discharge mode in a state in which the current detected by the current sensor is not abnormal during the current conduction mode, the control unit executes the OFF sequence, (c) when the current sensor detects an excessive current during the current conduction mode, the control unit closes only the relay contact while avoiding the OFF sequence, and (d) when shifting from the storage battery discharge mode to the current conduction mode, the control unit executes the ON sequence.
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Specification