Apparatus and method for high efficiency isolated power converter
First Claim
1. A DC-DC converter comprising:
- a first stage, comprisinga first controllable bridge adapted to control conduction of current to and from a first and a second poles of said converter to a first central tap using a first and a second switching means arranged in a totem-pole arrangement between said first and said second poles, the voltage between said first and said second poles is denoted Vin;
a first and a second capacitors connected in series between said first and said second poles forming a third tap between them;
a second stage, comprisinga second controllable bridge adapted to control conduction of current to and from a third and a fourth poles of said converter to a second central tap using a third and a fourth switching means arranged in a totem-pole arrangement between said third and a said fourth poles, the voltage between said third and said fourth poles is denoted Vout;
a third and a fourth capacitors connected in series between said third and said fourth poles forming a fourth tap between them;
a resonance circuit having a first path connected between said first and said second taps and a second path connected between said third and said fourth taps, said resonance circuit comprising at least a resonance inductor and a resonance capacitor, said resonance circuit having a resonance frequency;
a control unit adapted to switch ON and OFF each of said first, second, third and fourth switching means, and to receive indication of a reference voltage and of said Vin and said Vout.
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Accused Products
Abstract
A DC-DC converter apparatus comprising half or full bridge, two-stage resonant converter, which may include series resonant (inductor, capacitor) devices. An isolated transformer having primary and secondary winding supplies current to full-wave secondary stage-bridge through the use of primary winding resonant devices employing primary stage-bridge. The magnetizing of said devices employs zero-current, zero-voltage resonant-transition switching technology, which reduces switching losses at all switching frequencies to almost zero. The regulation of output voltage at all loads and input voltages achieved by the control of the switching frequency and the phase between signals for primary and secondary stages. The proper intermittent of the frequency and the phase allows achieving the value of efficiency up to 97%.
112 Citations
8 Claims
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1. A DC-DC converter comprising:
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a first stage, comprising a first controllable bridge adapted to control conduction of current to and from a first and a second poles of said converter to a first central tap using a first and a second switching means arranged in a totem-pole arrangement between said first and said second poles, the voltage between said first and said second poles is denoted Vin; a first and a second capacitors connected in series between said first and said second poles forming a third tap between them; a second stage, comprising a second controllable bridge adapted to control conduction of current to and from a third and a fourth poles of said converter to a second central tap using a third and a fourth switching means arranged in a totem-pole arrangement between said third and a said fourth poles, the voltage between said third and said fourth poles is denoted Vout; a third and a fourth capacitors connected in series between said third and said fourth poles forming a fourth tap between them; a resonance circuit having a first path connected between said first and said second taps and a second path connected between said third and said fourth taps, said resonance circuit comprising at least a resonance inductor and a resonance capacitor, said resonance circuit having a resonance frequency; a control unit adapted to switch ON and OFF each of said first, second, third and fourth switching means, and to receive indication of a reference voltage and of said Vin and said Vout.
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2. A method of controlling a DC-DC converter, said converter comprising a first stage comprising a first controllable bridge adapted to control conduction of current to and from a first and a second poles of said converter to a first central tap using a first and a second switching means arranged in a totem-pole arrangement between said first and said second poles, the voltage between said first and said second poles is denoted Vin;
- a first and a second capacitors connected in series between said first and said second poles forming a third tap between them;
a second stage, comprising a second controllable bridge adapted to control conduction of current to and from a third and a fourth poles of said converter to a second central tap using a third and a fourth switching means arranged in a totem-pole arrangement between said third and a said fourth poles, the voltage between said third and said fourth poles is denoted Vout;
a third and a fourth capacitors connected in series between said third and said fourth poles forming a fourth tap between them;
a resonance circuit having a first path connected between said first and said second taps and a second path connected between said third and said fourth taps, said resonance circuit comprising at least a resonance inductor and a resonance capacitor, said resonance circuit having a resonance frequency; and
a control unit adapted to switch ON and OFF each of said first, second, third and fourth switching means, and to receive indication of a reference voltage and of said Vin and said Vout,the method comprising; providing control signals to said first, said second, said third and said fourth switching means to control the actual frequency of said converter and the phase shift between said first stage and said second stage. - View Dependent Claims (3, 4, 5, 6, 7, 8)
- a first and a second capacitors connected in series between said first and said second poles forming a third tap between them;
Specification