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Triac snubber is a circuit that protects triacs (triode for alternating current) from voltage spikes and unintended turn-on 13.
It consists of a resistor and a capacitor connected across the triac 4. The snubber circuit limits the voltage and the rate of rise of the off-state voltage during device turn-off, as well as the critical current rate-of-rise during turn-on 3.
This type of circuit is used in various applications, including:
- Light dimmers 23. By controlling the firing angle of the triac, the power supplied to the light can be shifted, allowing for smooth dimming 2.
- Motor speed control 23. Triacs are used to control the power supplied to the motor, thereby changing its speed 3.
- Switching power supplies 3. In some switching power supply circuits, triacs are used to control the power supplied to the load 3.
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