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   In order to speed up the protection, the capacity of filter capacitor C1 is low, generally 2.2 ~ 10 F. Usually, the 8V AC sampling signal of the voltage-losing circuit, after rectifying and filtering, outputs About-10v voltage-losing signal voltage on the gate of VT1, so that VT1 is usually in the cut-off state, does not affect the opening voltage amplitude of the lock door and the normal opening of the lock door. When the loss of voltage sampling voltage disappears, the leakage current of VT1 with gate voltage drop of 0 VT1 diverts the circuit, which makes the R4 output of the lockout gate open voltage drop almost to 0. Therefore, the closed door quickly shut off the inverter drive signal, so that the inverter module quickly shut off, protect the safety of the module. When the C1 capacity is reduced, the pulse component of the rectified DC loss voltage sampling signal voltage is greatly increased, which causes the-10V voltage of the VT1 gate to fluctuate towards 0 V, which causes the VT1 to break away from the cut-off state and produces the fluctuating drain current, as a result, the opening voltage of the lock door fluctuates. Because the capacity of C1 decreases little, the characteristics of the fault phenomenon are not obvious, so the above-mentioned special hiccup voltage phenomenon occurs. If the C1 capacity is compleby lost, the dotted part of the p-point voltage waveb of the lockout gate will cause the VT1 to switch on intermittently, 

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5STP45Q2800

DSBC174 3BSE012211R1

5STP45Q2800  由【廈門興銳嘉進(jìn)出口有限公司】優(yōu)惠供應(yīng).