Series resonant lamp circuit having direct electrode connection

Details Series resonant lamp circuit having direct electrode connection Series resonant lamp circuit having direct electrode connection

1995-08-09

1999-04-27

Shingleton, Michael

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315278, 315219, 315224, 315307, 363 17, H05B 3702

Patent

active

058982787

ABSTRACT:
For driving gas discharge lamps, a ballast is provided between the positive and the negative output terminals of a rectifier arrangement (D1, D2, D3, D4). The ballast comprises a filter stage (C1, C2, C3, DR1, DR2) with an oscillation voltage build-up circuit (R1, C6, D5, DIAC) and with a high-frequency resonant circuit (R2-R6, T1, T2, D5, D6, C6, I1, I2), and also with a decoupling capacitor (C7), a third inductor (DR3) and a third inductance (I3, I4). This third inductance is wound together with the two abovementioned windings of the high-frequency resonant circuit (I1, I2) onto a common core. The ballast is routed by a connecting line (VL) from the junction (H) between the two transistors (T1, T2) to one electrode (E1) of the discharge lamp (FL), the second electrode (E2) of which is connected to the first electrode (E1) via a resonant capacitance (C12, C13). There is provided in the circuit between the connecting line (VL) and the connection of the discharge lamp (FL) to the rectifier (D1, D2, D3, D4) a series resonant circuit having an inductance (DR3, I4) and a capacitance (C8) for limiting the current and for building up a voltage potential of the high-frequency supply of the discharge lamp (FL) in order to activate the diodes (D1, D2, D3, D4) in the rectifier. The result of this is that the reactive current component is almost zero and the voltage spikes are virtually suppressed on the mains side.

REFERENCES:
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patent: 4544863 (1985-10-01), Hashimoto
patent: 4581562 (1986-04-01), Nilssen
patent: 4749909 (1988-06-01), Smulders
patent: 5122712 (1992-06-01), Hirschmann
patent: 5138235 (1992-08-01), Sun et al.
patent: 5475284 (1995-12-01), Lester et al.
patent: 5488269 (1996-01-01), El Hamamsy et al.
patent: 5512801 (1996-04-01), Nilssen
patent: 5559394 (1996-09-01), Wood

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