Zero-voltage switching type electronic ballast for fluorescent l

Details Zero-voltage switching type electronic ballast for fluorescent l Zero-voltage switching type electronic ballast for fluorescent l

1994-06-24

1996-03-19

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363132, 363 17, 315190, 315291, 315307, 315294, H02M 7537, H05B 3702

Patent

active

055007929

ABSTRACT:
A zero-voltage switching type electronic ballast for a fluorescent lamp includes a pair of capacitors connected in series between first and second nodes of a DC power source; a pair of switching devices whose current passages are connected in series between the first and second nodes of the DC power source; a load resonant circuit portion having a serial resonant circuit between the connection node of the pair of capacitors and the connection node of the pair of switching devices, and a discharge lamp; capacitors each connected in parallel to the current passage of the switching devices; a driving transformer having a secondary side which includes first and second windings each connected to the respective switching devices and having opposite polarities, and a third winding having the same polarity as the first winding and connected between the connection node of the pair of switching devices and the load resonant circuit, and a primary side having a fourth winding to which a switching control signal of a predetermined high frequency is applied. A switching control signal generating circuit compares a comparison signal of a predetermined high frequency with first and second reference.

REFERENCES:
patent: 5063490 (1991-11-01), Maehara et al.
patent: 5303140 (1994-04-01), Shimizu
patent: 5313143 (1994-05-01), Vila-Masot

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