Three-phase alternating-current power supply switching circuit
AssigneeMitsubishi Electric Corporation
InventorKoji Hasegawa
Life of this patent
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Abstract
An operation circuit is set to a conductive state in a case where a three-phase alternating-current power supply switching circuit receives an R phase and an N phase. An internal switch is set to a non-conductive state in a case where the state of the operation circuit is the conductive state. One contactor electrically connects an input terminal to output terminals in a case where the state of the operation circuit is the conductive state. Another contactor electrically disconnects input terminals from the output terminals in a case where the state of the internal switch is the non-conductive state.
Claims3
A three-phase alternating-current power supply switching circuit connected to three first input terminals for respectively receiving a first phase, a second phase, and a third phase that form a three-phase alternating current and connected to a second input terminal for receiving a fourth phase being an N phase, said three-phase alternating-current power supply switching circuit comprising:
- three output terminals that respectively correspond to said three first input terminals;
- a first operation circuit that is set to any of a first conductive state and a first non-conductive state;
- a first contactor that is controlled by said first operation circuit;
- a second operation circuit that is set to any of a second conductive state and a second non-conductive state;
- and
- a second contactor that is controlled by said second operation circuit, wherein
- said second operation circuit is set to:
- (a1) said second conductive state in a case where said three-phase alternating-current power supply switching circuit receives said first phase and said fourth phase, and
- (a2) said second non-conductive state in a case where said three-phase alternating-current power supply switching circuit does not receive at least one of said first phase and said fourth phase,
- said second contactor includes an internal switch,
- said internal switch is set to:
- (a3) a third conductive state in a case where a state of said second operation circuit is said second non-conductive state, and
- (a4) a third non-conductive state in a case where the state of said second operation circuit is said second conductive state,
- said second contactor:
- (a5) electrically disconnects said second input terminal from said three output terminals in a case where the state of said second operation circuit is said second non-conductive state, and
- (a6) electrically connects said second input terminal to said three output terminals in a case where the state of said second operation circuit is said second conductive state,
- said first operation circuit is set to:
- (a7) said first conductive state in a case where said three-phase alternating-current power supply switching circuit receives said second phase and a state of said internal switch is said third conductive state, and
- (a8) said first non-conductive state in a case where the state of said internal switch is said third non-conductive state, and
- said first contactor:
- (a9) electrically disconnects said three first input terminals from said three output terminals in a case where a state of said first operation circuit is said first non-conductive state, and
- (a10) electrically and respectively connects said three first input terminals to said three output terminals in a case where the state of said first operation circuit is said first conductive state.
Dependencies are inferred from the claim text.