Transformerless fluorescent lamp operating circuit, particularly

Details Transformerless fluorescent lamp operating circuit, particularly Transformerless fluorescent lamp operating circuit, particularly

1992-08-25

1994-09-20

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315227R, 315232, 315238, 315239, 315242, 315DIG7, H05B 3702

Patent

active

053492706

ABSTRACT:
To eliminate the necessity for a saturated or air gap inductance to provide feedback circuit for a self-exciting oscillator including two active electronic switches (T1, T2) , for example MOSFETs, an auxiliary winding (HW1, HW2, . . . HW11) is inductively coupled to the resonance inductance (L2) present in the circuit for the discharge lamp (LP) anyway; and a pulse shaping - phase shifting network (R3, C3; R4, C4 . . . ) , devoid of inherent resonance, coupling the auxiliary winding to the active switching elements. The pulse shaping - phase shifting network is formed of a one or multiple-stage RC low-pass circuit, connected serially between the auxiliary winding and the control input, for example the gate, of the active switching element. The RC network can be constructed with variable elements, for example including PTC resistors, a varistor or the like, and may include a current source, protective circuits to protect against voltage peaks including Zener diodes. The low-pass characteristics of the pulse shaping - phase shifting network permits switching of the active semiconductor switches after the maximum current flow.

REFERENCES:
patent: 4438372 (1984-03-01), Zuchtreigel
patent: 4572989 (1986-02-01), Zuchtriegel
patent: 4710682 (1987-12-01), Zuchtreigel
patent: 5008596 (1991-04-01), Kastl et al.
patent: 5140224 (1992-08-01), Kakitani et al.

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