Protection circuit in TRIAC applications

摘要

Aspects of the disclosure provide a circuit. The circuit includes a transistor configured to control energy entering the circuit from a power supply, a capacitor coupled with the transistor to store the energy that enters the circuit, and a protection circuit configured to counteract a voltage change of the transistor that is caused by a step voltage change in the power supply. In an embodiment, the protection circuit operates independent of the stored energy on the capacitor.

主权项

1. A circuit, comprising:
a transistor configured to control energy entering the circuit from a power supply; a capacitor coupled with the transistor to store the energy that enters the circuit; a protection circuit configured to counteract a gate voltage change on a gate terminal of the transistor that is caused by a step voltage change in the power supply, wherein the protection circuit is configured to operate independent of the energy stored on the capacitor; and a control circuit configured to control the transistor based on the energy stored on the capacitor, wherein the protection circuit is configured to counteract the gate voltage change on the gate terminal of the transistor that is caused by the step voltage change in the power supply before the control circuit is able to react to the gate voltage change on the gate terminal of the transistor that is caused by the step voltage change in the power supply.