Control of a series resonant converter
First Claim
1. A series resonant converter for supplying regulated power to an output circuit from an unregulated DC source, comprising:
- (a) power conversion means comprising;
(i) a series resonant circuit including a primary winding of a transformer coupling said converter to a said output circuit; and
(ii) first and second actuatable switching means each, when on, connecting said source with said series resonant circuit in such a manner that when said switching means are alternately turned on sinusoidal current pulses alternately flow from said source in opposing directions in said primary winding; and
(b) control means comprising;
(i) first control means for actuating said switching means on and off at an operating frequency depending upon loading conditions at said output circuit; and
(ii) second control means connected to said first control means for controlling said first control means in dependence upon whether current is flowing in said resonant circuit in such a manner as to allow said first control means to actuate said switching means so as to cause that one of said switching means which is then on to be turned off only when minimal or no current is flowing in said resonant circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A series resonant converter is interposed between an unregulated voltage source and an output circuit. The converter employs a pair of power switches each, when on, completing a series resonant circuit from the source to a resonant tank circuit including the primary winding of a transformer coupled to the output circuit. The power switches are alternately turned on and off so that sinusoidal current pulses alternately flow in opposite directions in the primary winding at a frequency dependent on input and output conditions. The current flowing in the resonant circuit is monitored and the power switches are additionally controlled to prevent turn on of one switch and turn off of the other when current is still flowing in the resonant circuit.
-
Citations
16 Claims
-
1. A series resonant converter for supplying regulated power to an output circuit from an unregulated DC source, comprising:
-
(a) power conversion means comprising; (i) a series resonant circuit including a primary winding of a transformer coupling said converter to a said output circuit; and (ii) first and second actuatable switching means each, when on, connecting said source with said series resonant circuit in such a manner that when said switching means are alternately turned on sinusoidal current pulses alternately flow from said source in opposing directions in said primary winding; and (b) control means comprising; (i) first control means for actuating said switching means on and off at an operating frequency depending upon loading conditions at said output circuit; and (ii) second control means connected to said first control means for controlling said first control means in dependence upon whether current is flowing in said resonant circuit in such a manner as to allow said first control means to actuate said switching means so as to cause that one of said switching means which is then on to be turned off only when minimal or no current is flowing in said resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A series resonant converter for supplying regulated power to an output circuit from an unregulated DC source, comprising:
-
(a) power conversion means comprising; (i) a series resonant circuit including a primary winding of a transformer coupling said converter to a said output circuit; and (ii) first and second actuatable switching means each, when on, connecting said source with said series resonant circuit in such a manner that when said switching means are alternately turned on sinusoidal current pulses alternately flow from said source in opposing directions in said primary winding; and (b) control means comprising; (i) first control means for generating a signal for actuating said switching means on and off at an operating frequency depending upon loading conditions at said output circuit; and (ii) second control means responsive to current flowing in said resonant circuit, said second control means connected to said first control means for allowing said actuating signal to be electrically connected to said switching means so as to cause that one of said switching means which is then on to be turned off only when minimal or no current is flowing in said resonant circuit. - View Dependent Claims (10, 11, 12, 13)
-
-
14. A power module of the series resonant type for supplying regulated power to an output circuit from an unregulated DC source, comprising:
-
(a) a series resonant circuit including a primary winding of a transformer coupling said power module to a said output circuit; (b) first and second switching means each, when on, connecting said source with said series resonant circuit in such a manner that when said switching means are alternately turned on sinusoidal current pulses alternately flow from said source in opposing directions in said primary winding; and (c) driver generator means coupled to said switching means for supplying driver signals to alternately turn off that one of said switching means which is on and turn on that one of said switching means which is off; (d) first control means coupled to said driver generator means for allowing said driver signals to be supplied at a repetition rate which is dependent upon loading conditions at said output circuit such that said switching means are turned on and off at an operating frequency depending upon said loading conditions; and (e) second control means connected to said first control means, said second control means responsive to said resonant current for preventing said first control means from allowing said driver generator means to supply that one of said driver signals which turns off said on switching means until minimal or no current is flowing in said resonant circuit. - View Dependent Claims (15, 16)
-
Specification