Load compensating gain control for a series resonant inverter
First Claim
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1. An improved dc-to-dc converter, comprising:
- a resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series to define a respective junction therebetween and each pair of series-connected switch means being adapted to be connected in parallel across an external dc supply;
a series resonant circuit connected between the junctions of said controllable switch means and comprising a capacitor and an inductor, said inverter being adapted to apply a rectangular wave voltage to said series resonant circuit;
a full wave rectifier inductively coupled to said series resonant circuit, the output of said rectifier being adapted to supply a substantially constant preselected output voltage at a substantially constant output current to a load; and
load compensating gain control means for maintaining a substantially constant inverter loop gain by multiplying a load compensation factor corresponding to said preselected output voltage and to said output current of said inverter with a voltage gain of said inverter.
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Abstract
A series resonant inverter is controlled to maintain a substantially constant gain and a substantially constant bandwidth, thereby ensuring stable operation under all operating conditions. A load compensating gain control circuit generates a unique gain or attenuation factor for each unique set of output load conditions. To maintain constant gain, inverter gain for each set of operating conditions is multiplied by the corresponding gain or attenuation factor. Bandwidth is increased (or decreased) and maintained constant to ensure stable operation.
13 Citations
7 Claims
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1. An improved dc-to-dc converter, comprising:
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a resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series to define a respective junction therebetween and each pair of series-connected switch means being adapted to be connected in parallel across an external dc supply; a series resonant circuit connected between the junctions of said controllable switch means and comprising a capacitor and an inductor, said inverter being adapted to apply a rectangular wave voltage to said series resonant circuit; a full wave rectifier inductively coupled to said series resonant circuit, the output of said rectifier being adapted to supply a substantially constant preselected output voltage at a substantially constant output current to a load; and load compensating gain control means for maintaining a substantially constant inverter loop gain by multiplying a load compensation factor corresponding to said preselected output voltage and to said output current of said inverter with a voltage gain of said inverter. - View Dependent Claims (2, 3, 4)
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5. A method for controlling a resonant inverter, said inverter having controllable switch means for producing a rectangular wave signal and applying said rectangular wave signal to a series resonant circuit, the output of said resonant inverter providing a substantially constant preselected output voltage and a substantially constant output current to a load, said method comprising the steps of:
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determining the voltage gain of said inverter corresponding to said preselected output voltage and said output current; multiplying the voltage gain of said inverter by a compensation factor corresponding to said preselected output voltage and to said output current in order to provide a substantially constant inverter loop gain. - View Dependent Claims (6, 7)
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Specification