Improved_lamp_dimmer

This circuit is an enhanced version of the circuit depicted in Figure 8-21. The hysteresis effect has been mitigated through the incorporation of two diodes and a 5.1 kΩ resistor. An RC network is connected across the TRIAC, functioning as a snubber to avert line transients that could inadvertently trigger the TRIAC. The circuit is designed to operate with a 120-V, 60-Hz power source and is capable of controlling up to 1000 W of power.

The circuit employs a TRIAC as the primary switching element, allowing for efficient control of AC loads. The addition of two diodes serves to rectify the input signal, ensuring that the TRIAC is only activated under specific conditions, thereby eliminating the hysteresis effect that can lead to unwanted switching behavior. The 5.1 kΩ resistor plays a critical role in setting the threshold voltage for the triggering of the TRIAC, providing stability and precision in its operation.

The RC snubber network, consisting of a resistor and capacitor in series, is strategically placed across the TRIAC to absorb voltage spikes and transients that may occur in the AC line. This protective measure is essential in preventing false triggering of the TRIAC, which could otherwise lead to erratic operation or damage to the circuit components.

The circuit is rated for a maximum power handling capability of 1000 W, making it suitable for various applications where reliable control of AC loads is required. It operates efficiently at a nominal voltage of 120 V and a frequency of 60 Hz, which is standard for many household and industrial electrical systems. Overall, this design offers a robust solution for controlling high-power AC devices while ensuring safety and reliability through its thoughtful incorporation of protective elements.This circuit is an improved version of the circuit shown in Fig. 8-21. The hysteresis effect is eliminated by the addition of two diodes and the 5.1 -k? resistor. The RC network across the triac is a snubber to prevent line transients from accidentally firing the triac. The circuit operates from a 120-V 60-Hz source, and can control up to 1000 W of power to.. 🔗 External reference