Series resonant converter having a resonant snubber
First Claim
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1. A power converter comprising:
- a power source;
four switching devices arranged as two switching pairs, each of said pairs comprising two series-connected switching devices, each of said two switching pairs being coupled across said power source, each of said switching devices including means for actuating said switching devices between ON and OFF states;
each of said switching devices comprises an anti-parallel diode shunting corresponding ones of said switching devices, said anti-parallel diode being poled to conduct current in opposition to the current through said corresponding switching device from said power source;
controller means coupled to said four switching devices for providing control signals individually to said actuating means;
a resonant circuit including inductive elements and a capacitive element in series, said resonant circuit being coupled between a juncture of the two series-connected switching devices of a first of said two switching pairs and a juncture of the two series-connected switching devices of the other of said two switching pairs;
a transformer having primary and secondary windings, said primary windings being coupled in series with said resonant circuit such that current through said resonant circuit impresses a voltage across said primary windings;
means coupled to said resonant circuit for constraining the voltage on said resonant circuit to within a predetermined value;
means connected in parallel with at least one of said switching devices for providing a source current to said one of said switching devices; and
rectifier means coupled to said secondary winding of said transformer for generating a predetermined output voltage.
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Abstract
A fixed frequency, series resonant converter having a resonant snubber comprising an inductor and capacitor connected across a tank circuit of the converter. An optimum amount of inductance in the resonant snubber minimizes the degree of "shoot-thru," or conduction through a body-diode within a transistor switch of the converter caused by ringing, which allows for nearly sinusoidal current to be provided to a full bridge high voltage rectifier enabling the power converter to operate at a higher frequency. An alternate embodiment applies the resonant snubber only across a selected transistor switch.
98 Citations
11 Claims
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1. A power converter comprising:
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a power source; four switching devices arranged as two switching pairs, each of said pairs comprising two series-connected switching devices, each of said two switching pairs being coupled across said power source, each of said switching devices including means for actuating said switching devices between ON and OFF states; each of said switching devices comprises an anti-parallel diode shunting corresponding ones of said switching devices, said anti-parallel diode being poled to conduct current in opposition to the current through said corresponding switching device from said power source; controller means coupled to said four switching devices for providing control signals individually to said actuating means; a resonant circuit including inductive elements and a capacitive element in series, said resonant circuit being coupled between a juncture of the two series-connected switching devices of a first of said two switching pairs and a juncture of the two series-connected switching devices of the other of said two switching pairs; a transformer having primary and secondary windings, said primary windings being coupled in series with said resonant circuit such that current through said resonant circuit impresses a voltage across said primary windings; means coupled to said resonant circuit for constraining the voltage on said resonant circuit to within a predetermined value; means connected in parallel with at least one of said switching devices for providing a source current to said one of said switching devices; and rectifier means coupled to said secondary winding of said transformer for generating a predetermined output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification