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P6002ACMC датащи(PDF) 121 Page - Teccor Electronics |
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P6002ACMC датащи(HTML) 121 Page - Teccor Electronics |
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121 / 212 page ![]() Triac Protection © 2002 Teccor Electronics 3 - 33 http://www.teccor.com SIDACtor® Data Book and Design Guide +1 972-580-7777 Triac Protection Thyristors Damage can occur to a thyristor if the thyristor’s repetitive peak off-state voltage is exceeded. A thyristor’s repetitive peak off-state voltage may be exceeded due to dirty AC power mains, inductive spikes, motor latch up, and so on. Thyristor Reference Circuit Figure 3.40 and Figure 3.41 show two different methods of protecting a triac. In Figure 3.40, a SIDACtor device is connected from MT2 to the gate of the triac. When the voltage applied to the triac exceeds the SIDACtor device’s VDRM, the SIDACtor device turns on, producing a gate current which turns the triac on. Figure 3.40 TRIAC Protection The circuit in Figure 3.41 places a SIDACtor device across MT2 and MT1 of the triac. In this instance the SIDACtor device protects the triac by turning on and shunting the transient before it exceeds the VDRM rating of the triac. Figure 3.41 TRIAC Protection With both methods, consider the following designs when using a SIDACtor device to protect a thyristor: • VDRM of the SIDACtor device < VDRM of Triac • SIDACtor device VDRM > 120% VPK(power supply) • SIDACtor device must be placed behind the load MT2 Triac To Gating Circuitry Hot Neutral MT1 SIDACtor Load 47 Ω MT2 Triac To Gating Circuitry Hot Neutral MT1 SIDACtor Load |
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