Resonant inverter having crest factor control

Details Resonant inverter having crest factor control Resonant inverter having crest factor control

1986-10-10

1988-02-23

Salce, Patrick R.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 98, 315DIG7, H02M 7538

Patent

active

047274700

ABSTRACT:
In a power-line-operated high-frequency electronic fluorescent lamp ballast, an inverter is powered from a DC supply voltage having a substantial amount of 120 Hz ripple. The fluorescent lamp is connected with the inverter's squarewave output voltage by way of a series-resonant L-C circuit. The amount of power supplied to the fluorescent lamp at any given moment depends on two significant factors: (i) the instantaneous magnitude of the DC supply voltage, and (ii) the instantaneous frequency of the inverter's squarewave output voltage. Arrangements are provided whereby the instantaneous inverter frequency is automatically adjusted over the duration of the 120 Hz ripple cycle such as to maintain the power supplied to the lamp substantially constant during this ripple cycle. As a result, in spite of a relatively large amount of ripple, the lamp current crest factor is maintained relatively low and substantially constant.

REFERENCES:
patent: 3624405 (1971-11-01), Bishop et al.
patent: 4277728 (1981-07-01), Stevens
patent: 4333134 (1982-06-01), Gurwicz
patent: 4347558 (1982-08-01), Kalinsky
patent: 4513364 (1985-04-01), Nilssen
patent: 4520255 (1985-05-01), Bredenkamp et al.
patent: 4525774 (1985-06-01), Kino et al.
patent: 4626983 (1986-12-01), Harada et al.

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