PROTECTION CIRCUIT FOR ELECTRONIC BALLASTS WHICH USE CHARGE PUMP POWER FACTOR CORRECTION

摘要

A protection circuit for electronic ballasts which use charge pump power factor correction includes a switch (160) with an overvoltage sensor (150), a resistor (170) and a diode (70). In the event of a fault condition, the switch (160) disables the charge pump power factor correction, while the resistor (170) and diode (70) prevent the switch (160) dissipating unduly large amounts of energy.