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Resonant converter control system having resonant current phase detection

  • US 5,777,864 A
  • Filed: 11/12/1996
  • Issued: 07/07/1998
  • Est. Priority Date: 12/28/1995
  • Status: Expired due to Term
First Claim
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1. A resonant converter control system comprising:

  • a power section including;

    a main power supply having an output port for supplying a DC power signal; and

    an inverter having an input port coupled to the output port of the main power supply to receive the DC power signal and a switch that turns on and off responsive to a drive signal to convert the DC power signal to a resonating AC current signal;

    a drive stage coupled to the inverter, the drive stage generating the drive signal responsive to a frequency signal;

    a current controller coupled to the power section to receive a first sense signal that indicates the power consumed by the power supply section, the current controller generating a first control signal responsive to the first sense signal;

    a phase difference assurance circuit coupled to the inverter to receive a second sense signal that indicates the resonating AC current signal and coupled to the drive stage to receive the drive signal, the phase difference assurance circuit generating a second control signal responsive to a phase difference between the second sense signal and the drive signal; and

    a frequency stage coupled to the current controller to receive the first control signal and coupled to the phase difference assurance circuit to receive the second control signal, the frequency stage generating the frequency signal responsive to the first and second control signals.

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