Damper circuit for switched dimming

摘要

A power converter includes dimmer circuit, a rectifier circuit, and a thyristor damper circuit. The dimmer circuit provides a dimmer voltage in response to an input voltage. The rectifier circuit provides a rectified voltage in response to the dimmer voltage. The thyristor damper circuit dampens an input current associated with the rectified voltage based on the input current and ceases dampening the rectified voltage based on the rectified voltage.

主权项

1. A circuit for use in a power converter, comprising:
a damping resistance having a first terminal coupled to an output of a rectifier circuit, the damping resistance having a second terminal coupled to a first terminal of an input filter capacitor of the power converter, wherein a second terminal of the input filter capacitor is coupled to the output of the rectifier circuit; a thyristor having a first terminal coupled to the first terminal of the damping resistance, the thyristor having a second terminal coupled to the second terminal of the damping resistance; and an enable circuit including a first resistance and a first capacitor coupled between the first terminal of the thyristor and a second terminal of the input filter capacitor of the power converter, wherein a terminal coupled between the first resistance and the first capacitor of the enable circuit is coupled to a gate terminal of the thyristor to enable the thyristor in response to an input voltage of the power converter.