Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1997-11-21
1999-03-02
Wong, Don
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315307, 315DIG7, 315DIG5, 315289, 315290, H05B 3700, H05B 3702, H05B 4100
Patent
active
058775951
ABSTRACT:
A gas discharge ballast circuit comprises a resonant load circuit including a resonant inductance, a resonant capacitance, and circuitry for connection to at least one gas discharge lamp. A d.c.-to-a.c. converter circuit is coupled to the load circuit for inducing an a.c. current in the circuit. It comprises first and second converter switches serially connected in the foregoing order between a bus conductor at a d.c. voltage and a reference conductor, and connected together at a common node through which the a.c. load current flows. The first and second converter switches each comprise a control node and a reference node, the voltage between such nodes determining the conduction state of the associated switch. The respective control nodes of the first and second converter switches are interconnected. The respective reference nodes of the first and second converter switches are connected together at the common node. A bridge network is connected between first and second nodes and has first and second input nodes on which respective first and second input signals are applied, and first and second output nodes respectively connected to the common and control nodes so as to control the switching state of the converter switches. An oscillator provides the first and second input signals. A boost capacitor is coupled between the bus and reference conductors. A boost inductor is supplies energy to the boost capacitor. A boost switch intermittently couples one end of the boost inductor between the bus and reference conductors so as to store energy in the inductor.
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Bruzga, Esq. Charles E.
General Electric Company
Lee Wilson
Wong Don
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