Resonant converter control system having resonant current phase

Details Resonant converter control system having resonant current phase Resonant converter control system having resonant current phase

1996-11-12

1998-07-07

Nappl, Robert

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 17, 363132, 323217, 323238, H02M 324

Patent

active

057778647

ABSTRACT:
A resonant convertor control system regulates a resonant AC current based on the amount of input power consumed by the system. The switching frequency and resonant AC current are limited by a phase difference assurance circuit that compares the phase of a drive signal with the phase of the resonant AC current. By detecting the phase of the resonant current instead of the resonant voltage, it eliminates the need for the costly components required to detect the resonant voltage. The system includes a main power supply for supplying a DC power signal and an inverter that converts the DC power signal to a resonating AC current signal responsive to a drive signal from a drive stage. An input current controller receives a first sense signal that indicates the power consumed by the main power supply and generates a first control signal that regulates the power consumed by the load. A phase difference assurance circuit generates a second control signal responsive to phase difference between the resonant AC current signal and the drive signal. The second control signal adjusts the frequency signal responsive to the second control signal, thereby assuring a phase difference between the second sense signal and the drive signal and eliminating excessive current flow in the inverter.

REFERENCES:
patent: 4820891 (1989-04-01), Tanaka et al.

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