Zero-current switching quasi-resonant converters operating in a full-wave mode
First Claim
1. A quasi-resonant converter for providing regulated power comprising:
- (a) a voltage source;
(b) a load;
(c) a low pass filter formed from at least an inductor and a capacitor for filtering signal applied to said load;
(d) bidirectional resonant switch means to be periodically actuated and deactuated, said switch means including a switch, a resonant capacitor, and a resonant inductor, said switch being actuated to a first state to permit a current flow in a first direction from said voltage source to said load and to block a current flow in a second, opposite direction, and being actuated to a second state to permit a current flow in said second direction from said load to said voltage source and to block the current flow in said first direction, for operating said quasi-resonant converter in a full-wave mode; and
(e) said switch means being actuated to its first state to couple said resonant capacitor and said resonant inductor to form a resonant circuit, and to apply a charging current from said voltage source to said resonant capacitor, said resonant capacitor and said resonant inductor having respective selected impedances to establish a resonating current waveform on said resonant inductor, said resonating current waveform being applied to actuate and deactuate said switch means under zero current conditions.
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Accused Products
Abstract
A family of quasi-resonant converters for providing regulated power is disclosed as comprising a voltage source, a load and a resonant switch circuit, for periodically connecting the voltage source to the load. The resonant switch circuit includes a switch, and a resonant circuit comprised of a resonant capacitor and a resonant inductor. The switch is actuated to its first state to permit a current flow in a first direction from the voltage source to the load and to block a current flow in a second, opposite direction, and deactuated to a second state to permit a current flow in the second direction from the load to the voltage source and to block the current flow in the first direction, whereby the quasi-resonant converter is operative in a full-wave mode. More specifically, the switch in its first state couples the resonant capacitor and the resonant inductor together to form a resonant switch circuit. The impedances of the resonant capacitor and the resonant inductor are selected to establish a resonating current waveform on the resonant inductor to apply zero-current conditions to the switch at turn on and turn off.
260 Citations
12 Claims
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1. A quasi-resonant converter for providing regulated power comprising:
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(a) a voltage source; (b) a load; (c) a low pass filter formed from at least an inductor and a capacitor for filtering signal applied to said load; (d) bidirectional resonant switch means to be periodically actuated and deactuated, said switch means including a switch, a resonant capacitor, and a resonant inductor, said switch being actuated to a first state to permit a current flow in a first direction from said voltage source to said load and to block a current flow in a second, opposite direction, and being actuated to a second state to permit a current flow in said second direction from said load to said voltage source and to block the current flow in said first direction, for operating said quasi-resonant converter in a full-wave mode; and (e) said switch means being actuated to its first state to couple said resonant capacitor and said resonant inductor to form a resonant circuit, and to apply a charging current from said voltage source to said resonant capacitor, said resonant capacitor and said resonant inductor having respective selected impedances to establish a resonating current waveform on said resonant inductor, said resonating current waveform being applied to actuate and deactuate said switch means under zero current conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification