Self-resonant inverter circuit

Details Self-resonant inverter circuit Self-resonant inverter circuit

1986-07-07

1988-01-26

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

315DIG7, H02M 3335

Patent

active

047220406

ABSTRACT:
An inverter circuit is provided in which the current can be controlled and which, when used in a gas discharge lamp control circuit, enables dimming and cathode preheat. The inverter comprises two switching means arranged to operate alternately, each controlled by means of a respective secondary element of a transformer, a primary element of the transformer having separate connections to capacitive means and bidirectional threshold means such as a diode arrangement. The bidirectional threshold means and capacitive means are connected as parallel branches to an input of a resonant circuit adapted to receive a load such as a gas discharge lamp. The inverter may further include a variable reactance in the branch including the capacitive means and a sub-circuit may be used to regulate the reactance and thus to control the current drawn by the inverter.

REFERENCES:
patent: 4183079 (1980-01-01), Wachi
patent: 4188661 (1980-02-01), Bower et al.
patent: 4424556 (1984-01-01), Maeda et al.
patent: 4439819 (1984-03-01), Regan
patent: 4525649 (1985-06-01), Knoll et al.
patent: 4532456 (1985-07-01), Knoll et al.
patent: 4603378 (1986-07-01), Virta

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