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EP0060519A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power source device

Assignee: Hitachi Ltd
•
Filing: 1982-03-11
•
Granted: —
•
Expires: 2002-03-11
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Abstract

Abstract A rectifier circuit (201) for converting an A.C.voltage into D.C. is comprised. An output of the rectifier circuit (201) is converted into a high-frequency A.C.voltage by a high-frequency switching circuit (202). An output of the high-frequency switching circuit (202) is converted into a high-frequency sinusoidal wave by a resonance circuit (203). A synchronous detector circuit (204) detects a point of time at which the high-frequency sinusoidal current delivered from the resonance circuit (203) becomes zero. A pulse width control circuit (205) controls the pulse width of the output of the high-frequency switching circuit (202) so that the high-frequency switching circuit (202) may turn «on» at the zero point of the high-frequency sinusoidal current as detected by the synchronous detector circuit (204), and that it may turn «off» when the output current of the resonance circuit (203) has reached a predetermined value.

Inventors

  • 👤 Syoichi Ito
  • 👤 Kunio Tajima
  • 👤 Junichi Enomoto
  • 👤 Masanobu Nagaoka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 11:45
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 107 words
A power source device comprising a first rectifier (2 0 1) circuit which converts a voltage of an A.C. power supply into a D.C. voltage, a switching circuit (2o2) which converts said D.C. voltage into a high-frequency A.C. voltage, a waveform converter circuit (2o3) which converts said high-frequency A.C. voltage into a sinusoidal A.C. voltage, a synchronous detector circuit (2o4) which detects a point of time at which an output current of said waveform converter circuit (203) becomes zero, and a pulse width control circuit (2 0 5) which controls "on" and "off" said switching circuit (202) in synchronism with the zero point of said output current.
Claim 2
Dependent Claim 107 words
A power source device comprising a first rectifier (2 0 1) circuit which converts a voltage of an A.C. power supply into a D.C. voltage, a switching circuit (2o2) which converts said D.C. voltage into a high-frequency A.C. voltage, a waveform converter circuit (2o3) which converts said high-frequency A.C. voltage into a sinusoidal A.C. voltage, a synchronous detector circuit (2o4) which detects a point of time at which an output current of said waveform converter circuit (203) becomes zero, and a pulse width control circuit (2 0 5) which controls "on" and "off" said switching circuit (202) in synchronism with the zero point of said output current.
Claim 3
Dependent Claim 88 words
A power source device according to Claim 1, further comprising a transformer (206) which transforms the output voltage of said waveform converter circuit (2o3) and delivers the transformed voltage, a boosting rectifier (207) which is connected to said transformer (206) and which boosts said transformed voltage and rectifies the boosted voltage, a second rectifier (208) circuit which is connected to said transformer and which rectifies the output voltage and delivers the rectified voltage, and a high-frequency circuit (209) which stabilizes said output voltage and delivers the stabilized voltage.
Claim 4
Dependent Claim 20 words
A power source device according to Claim 1, wherein said switching circuit (202) includes a start circuit for starting it.
Claim 5
Dependent Claim 57 words
A power source device according to Claim 1, wherein said switching circuit (2o2) is connected to the pulse width controller (205) through a control transformer (T 2 ), and the switching means is turned "on" in synchronism with an output signal which is provided from said pulse width controller (205) through said control transformer (T 2 ).
Claim 6
Dependent Claim 67 words
A power source device according to Claim 1, wherein said waveform converter circuit (203) is provided with a transformer (T 1 ) which transforms the output signal thereof and delivers the transformed signal, and said pulse width control circuit (205) controls the switching circuit (202) to turn "off" through a control transformer (T 2 ) in response to the output signal of said transformer (T 1 ).

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