Series resonant inverter with lossless snubber-resetting components
First Claim
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1. An improved series resonant bridge inverter, comprising:
- two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply;
a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said series resonant circuit further having means for coupling the output of the resonant inverter to a load, said controllable switch means providing a rectangular wave signal to said resonant circuit;
a snubber capacitor coupled across each of said controllable switch means; and
circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross.
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Abstract
A circuit for "resetting" snubbers in a series resonant bridge inverter maintains lossless snubber action during light-load and no-load inverter operation and during operation near resonance. Series resonant circuit operation is controlled to be above the resonant frequency to ensure operation at a lagging power factor. The snubber-resetting operation is facilitated by a relatively small inductor connected across the output terminals of the series resonant inverter.
50 Citations
9 Claims
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1. An improved series resonant bridge inverter, comprising:
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two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply; a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said series resonant circuit further having means for coupling the output of the resonant inverter to a load, said controllable switch means providing a rectangular wave signal to said resonant circuit; a snubber capacitor coupled across each of said controllable switch means; and circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross. - View Dependent Claims (2, 3, 4)
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5. An improved DC-to-DC converter, comprising:
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a series resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply; a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said controllable switch means providing a rectangular wave signal to said resonant circuit; a snubber capacitor coupled across each of said controllable switch means; circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross; and a full wave rectifier coupled to said series resonant circuit, the output of said rectifier being adapted to apply substantially constant output voltage to a load. - View Dependent Claims (6, 7, 8, 9)
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Specification