Control circuit for insuring super-resonant operation of resonan

Details Control circuit for insuring super-resonant operation of resonan Control circuit for insuring super-resonant operation of resonan

1987-05-04

1988-07-19

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 17, H02M 324

Patent

active

047589400

ABSTRACT:
A control circuit for insuring super-resonant operation of a DC-to-AC resonant converter, having a resonance circuit with a resonant frequency F.sub.r, in which a circulating current i.sub.r flows between a first node A, alternatingly connected between an input potential and a primary common potential at an operating frequency F, and a second node B, includes: a subcircuit for generating a first signal representative of the phase of the circulating current i.sub.r ; another subcircuit for generating a second signal representative of the phase of a potential V.sub.AB between the first and second nodes; and a comparator which compares the first and second signals to increase the operating frequency F if the phase of the circulating current i.sub.r leads the phase of the node-to-node potential V.sub.AB. The reasonance circuit can be a series, parallel or series-parallel resonant arrangement, typically driven by a pair of alternatingly-conductive semiconductor switching devices, themselves driven by a voltage-controlled oscillator (VCO). In one embodiment, the VCO frequency is increased whenever a current zero crossing occurs before the end of a VCO waveform half-cycle.

REFERENCES:
patent: 4541041 (1985-09-01), Park et al.
patent: 4591963 (1986-05-01), Retotar
patent: 4691273 (1987-09-01), Kuwata et al.
patent: 4695934 (1987-09-01), Steigerwald et al.

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