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US 8,508,165 B2Granted
AC-DC converter, method of controlling the same, motor driver, compressor driver, air-conditioner, and heat pump type water heater
AssigneeMitsubishi Electric Corporation
InventorsYosuke Shinomoto, Hideki Takahara, Masato Handa, Makoto Tanikawa, Mitsuo Kashima
Life of this patent
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Abstract
A rectifier connected with an AC source through a reactor, a plurality of capacitors connected in series between output terminals of the rectifier, first switching means connected between one input terminal of the rectifier and a connection point of a plurality of capacitors, second switching means connected between the other input terminal of the rectifier and the connection point of a plurality of capacitors, and a plurality of diodes connected with the plurality of capacitors in inverse-parallel are provided.
Claims21
An AC to DC converter, comprising:
- a rectifier connected with an AC source through a reactor,
- a plurality of capacitors connected between output terminals of said rectifier in series,
- first switching means connected between one input terminal of said rectifier and a connection point of said plurality of capacitors,
- second switching means connected between the other input terminal of said rectifier and the connection point of said plurality of capacitors, and
- a plurality of diodes connected with said plurality of capacitors in inverse-parallel,
- wherein, during half a period of said AC source, said rectifier drives and controls said switching means such that said rectifier outputs a substantially sinusoidal waveform in four rectification states:
- a full-wave rectification state, a first voltage doubler rectification state, a second voltage doubler rectification state, and power unit short-circuited state.
4 more elements
An AC to DC converter, comprising:
- a rectifier connected with an AC source through a reactor,
- a plurality of capacitors connected between output terminals of said rectifier in series,
- a plurality of switching means connected between input terminals of said rectifier in series, and
- a plurality of diodes connected with said plurality of capacitors in reverse-parallel, wherein
- a connection point of said plurality of capacitors and that of the plurality of switching means are connected,
- wherein, during half a period of said AC source, said rectifier drives and controls said switching means such that said rectifier outputs a substantially sinusoidal waveform in four rectification states:
- a full-wave rectification state, a first voltage doubler rectification state, a second voltage doubler rectification state, and power unit short-circuited state.
4 more elements
An AC to DC converter, comprising:
- a rectifier connected with an AC source through a reactor,
- a plurality of capacitors connected between output terminals of said rectifier in series,
- first switching means connected between one input terminal of said rectifier and a connection point of said plurality of capacitors,
- second switching means connected between the other input terminal of said rectifier and a connection point of said plurality of capacitors,
- a plurality of diodes connected with said plurality of capacitors in inverse-parallel,
- a first voltage detector that detects voltages across said plurality of capacitors,
- a second voltage detector that detects the voltage of said AC source, and
- control means that drives and controls said switching means, wherein
- said control means drives and controls said switching means to control the voltage between input terminals of said rectifier based on detection results of said first voltage detector and said second voltage detector so that the voltage across said plurality of capacitors becomes a desired voltage.
6 more elements
An AC to DC converter, comprising:
- a rectifier connected with an AC source through a reactor,
- a plurality of capacitors connected between output terminals of said rectifier in series,
- first switching means connected between one input terminal of said rectifier and a connection point of said plurality of capacitors,
- second switching means connected between the other input terminal of said rectifier and a connection point of said plurality of capacitors,
- a plurality of diodes connected with said plurality of capacitors in inverse-parallel,
- a first voltage detector that detects the voltage across said plurality of capacitors,
- a first current detector that detects the current of said AC source, and
- control means that drives and controls said switching means, wherein
- said control means drives and controls said switching means to control the voltage between input terminals of said rectifier based on detection results of said first voltage detector and said first current detector so that the voltage across said plurality of capacitors becomes a desired voltage.
6 more elements
An AC to DC converter, comprising:
- a rectifier connected with an AC source through a reactor,
- a plurality of capacitors connected between output terminals of said rectifier in series,
- first switching means connected between one input terminal of said rectifier and a connection point of said plurality of capacitors,
- second switching means connected between the other input terminal of said rectifier and a connection point of said plurality of capacitors,
- a plurality of diodes connected with said plurality of capacitors in inverse-parallel,
- a first voltage detector that detects voltages across said plurality of capacitors,
- a second voltage detector that detects the voltage of said AC source,
- a first current detector that detects the current of said AC source, and
- control means that drives and controls said switching means, wherein
- said control means drives and controls said switching means to control the voltage between input terminals of said rectifier based on detection results of said first voltage detector, said second voltage detector, and said first current detector so that the voltage across said plurality of capacitors becomes a desired voltage.
7 more elements
Dependencies are inferred from the claim text.