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High pressure sodium lamp electronic ballast circuit diagram

2014-11-11 19:26  
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High pressure sodium lamp electronic ballast circuit diagram
The circuit uses UC3854B as the control chip to establish an active power factor correction circuit with fixed frequency average current-mode, and the circuit is shown as the figure. In the figure, rectifier bridge B1, inductor L1, power switching device S1, boost diode D1, output filter capacitor C1 and resistor R1 form a current sampling PFC circuit. UC3854B provides all the active power factor correction features, which include voltage amplifier, analog multiplier / divider, current amplifier and a fixed frequency PWM, in addition, they also contain power MOSFET gate driver, 7.5V reference voltage, bus predictor, and over-current comparator.