Protective principle circuit diagram

Published:2011/8/1 2:23:00 Author:Ecco | Keyword: Protective principle | From:SeekIC

Protective circuitry: According to figure 1, when the supply is in start state, the electricity can be connected by R805, R858. On the one hand, when the output voltage is rising, the D811 can reach the state of starting by the IF1 of R864. D836 is later than D811, it appears the state of start when the current flows to LF2 from F, B, T 24. Then, IF1 produces firstly, IF2 is later, after Tr1 appears the state of ON , Tr2 can be switched on. When the burden is unusual, for example, it can produce overcurrent, and when base current of Q805 produces, Q805 appears the state of ON . When IF1 of D811 is cut-off, Tr1 will be the state of OFF . Q827 appears the state of breakover by VTr1 when through D823. Simultaneously, Q826 is also in starting state. The collector current Ic make the Q804 is in staring state, and the shunt of Ic passes R854 that make of Q827 base maintaining current, Q827, Q826 keep in the staring state. With the Ic, Q804 is in the staring state, the base of Q1 locating inside of IC802 connects 3 and then connects to the earth, the supply will stop working. When appearing short circuit, the circumstances are as below: a. 50V short circuit: D837 is on, D811 is stop. b. 115V short circuit: D830 is on, D811 is stop. c. 16V short circuit: the current of D811 isn't provided by R864, D811 will stop.



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