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EP0481456A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power conversion apparatus

Assignee: Mitsubishi Electric Corp
•
Filing: 1991-10-16
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Granted: —
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Expires: 2011-10-16
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Abstract

Abstract A power conversion apparatus comprises an inverter circuit (2) for converting DC power into AC power which has a first frequency; a transformer (3) connected to the inverter circuit (2); a cyclo converter circuit (4) having a bidirectional switch capable of controlling the direction in which an electric current passes and converting the output from the transformer (3) into AC power which has a second frequency; and a switching signal generating circuit (13) for generating a switching signal for controlling the polarity of the bidirectional switch of the cyclo converter circuit (4) in such a manner that the output voltage from the inverter circuit (2) does not encounter a short circuit.

Inventors

  • 👤 Nobuo Mitsubishi Denki K.K. Sashida
  • 👤 Kazunori Mitsubishi Denki K.K. Sanada

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 12:35
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/4807; H02M3/00

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 104 words
A power conversion apparatus comprising: an inverter circuit for converting DC power into AC power which has a first frequency; a transformer connected to said inverter circuit; a cyclo converter circuit having bidirectional switch means capable of controlling a direction in which an electric current passes and converting the output from said transformer into AC power which has a second frequency; and a switching signal generating circuit for generating a switching signal for controlling the polarity of said bidirectional switch means of said cyclo converter circuit in such a manner that the output voltage from said inverter circuit does not encounter a short circuit.
Claim 2
Dependent Claim 99 words
An apparatus according to Claim 1 further comprising: a carrier signal generating circuit for generating a carrier signal having a predetermined frequency; an inverter switching circuit for generating a signal for controlling said inverter circuit in synchronization with said carrier signal; and a reference voltage signal generating circuit for generating a reference signal for AC voltage to be transmitted from said cyclo converter circuit, said switching signal generating circuit generating a switching signal in response to the carrier signal transmitted from said carrier signal generating circuit and the reference voltage signal transmitted from said reference voltage signal generating circuit.
Claim 3
Dependent Claim 81 words
An apparatus according to Claim 1 wherein said bidirectional switch means of said cyclo converter circuit comprises a plurality of bidirectional switches each having a pair of switches each of which is arranged to pass an electric current in opposing directions, said switching signal generating circuit generating a switching signal for always switching on either of said pair of bidirectional switches which has a polarity which does not cause the output voltage from said inverter circuit to encounter a short circuit.
Claim 4
Dependent Claim 43 words
An apparatus according to Claim 3 wherein said switching signal generating circuit transmits a switching signal which corresponds to each switch of said bidirectional switch means of said cyclo converter circuit and as well as the pulse width of which has been modulated.
Claim 5
Dependent Claim 26 words
An apparatus according to Claim 1 further comprising a filter circuit for removing a high frequency component contained in the output from said cyclo converter circuit.
Claim 6
Dependent Claim 20 words
An apparatus according to Claim 1 wherein said inverter circuit transmits AC power the duty ratio of which is 50%.

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