Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1998-08-13
2000-04-18
Philogene, Haissa
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315219, 315244, 315224, 315DIG5, 315DIG7, H05B 3702
Patent
active
060519347
ABSTRACT:
A ballast circuit for a gas discharge lamp with high speed gate drive circuitry comprises a resonant load circuit including a resonant inductance, a resonant capacitance, and circuitry for connecting to a gas discharge lamp. A d.c.-to-a.c. converter circuit induces a.c. current in the load circuit, and comprises a pair of switches serially connected between a bus conductor at a d.c. voltage and a reference conductor, the voltage between a reference node and a control node of each switch determining the conduction state of the associated switch. The reference nodes of the switches are connected together at a common node through which the a.c. current flows, and the control nodes of the switches are connected together. A gate drive arrangement for regeneratively controlling the switches comprises a driving inductor connected between the common node and the control nodes and mutually coupled to an inductor in the load circuit for sensing current in the circuit. A bidirectional voltage clamp is connected between the common and control nodes. The clamp comprises a first Zener diode with an associated, serially connected, one-way current valve connected between the control and common nodes, and poled in one direction; and a second Zener diode with an associated, serially connected, one-way current valve connected between the control and common nodes, and poled in an opposite direction. The valves are connected to the diodes in a way to prevent the diodes from operating in a forward-biased mode, and have shorter reverse recovery times than reverse recovery times of the diodes.
REFERENCES:
patent: 5144205 (1992-09-01), Motto et al.
patent: 5402043 (1995-03-01), Nilssen
patent: 5440209 (1995-08-01), Nilssen
patent: 5446350 (1995-08-01), El-Hamamsy et al.
patent: 5459375 (1995-10-01), Nilssen
patent: 5796214 (1998-08-01), Nerone
General Electric Company
Philogene Haissa
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