| 摘要 |
A solid state ballast circuit for a discharge lamp includes a transistor oscillator with a current amplifier connected to a transformer one secondary winding of which is connected to the lamp and another secondary winding of which is coupled to the amplifier input. An inductive choke coil is connected in the power circuit of the amplifier so that when the lamp burns out or is removed the operating frequency increase resulting from the decrease in load circuit capacitance results in an increase in impedance of the choke, drastically reducing current flow through the amplifier power circuit to prevent transistor damage or RF interference radiation. The current amplifier disclosed is a two-stage emitter follower circuit.
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