High frequency gas discharge lamp dimming ballast

Details High frequency gas discharge lamp dimming ballast High frequency gas discharge lamp dimming ballast

H - Electricity

05

B

315/44

H05B 41/392 (2006.01)

Patent

CA 1254610

HIGH FREQUENCY GAS DISCHARGE LAMP DIMMING BALLAST ABSTRACT OF THE DISCLOSURE A high frequency gas discharge lamp dimming bal- last with good line power factor is disclosed. The unit is controlled by a current sensing loop which senses control switch current rather than lamp current and employs simple circuitry with sufficiently rapid control response neces- sary to maintain high line power factor and stable lamp operating characteristics over a very wide range of light output. An isolated output transformer provides protection against most common miswire conditions and accurately regu- lates lamp energy over a wide range of input and lamp arc voltage conditions. A pulse width modulated control input provides an isolated control input for easier wiring and reduces the susceptibility of the control to noise inter- ference.

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