Resonant inverter having frequency control

Details Resonant inverter having frequency control Resonant inverter having frequency control

1987-08-03

1989-04-04

Shoop, Jr., William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363132, 315DIG7, H02M 744

Patent

active

048191469

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 by the inverter to the series-resonant L-C circuit and/or to the fluorescent lamp at any given moment depends on three significant factors: (i) the instantaneous magnitude of the DC supply voltage, (ii) the instantaneous frequency of the inverter's squarewave output voltage, and (iii) the instantaneous operational characteristics of the fluorescent lamp. Arrangements are provided whereby the instantaneous inverter frequency is automatically adjusted so as to prevent inverter overload in case the fluorescent lamp is non-present or inoperative.

REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4525774 (1985-06-01), Kino et al.
patent: 4541041 (1985-09-01), Park et al.
patent: 4692855 (1987-09-01), Kuroiwa et al.
patent: 4700285 (1987-10-01), Szepesi
patent: 4712170 (1987-12-01), Grace

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