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High power DC motor over-current protection circuit diagram

2016-09-02 15:20  
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High power DC motor over-current protection circuit diagram
In order to prevent the motor generating high current and make the circuit work inappropriately. the Cl, Rl, RPl and NAND gate form the starting protection time delay circuit. When the motor starts, there is not voltage at Cl. At this time NAND gate 1 outputs low level, NAND gate 3 outputs high level, it makes the VT2 in the off mode, then the relay Kl does not work, andits contact stillkeeps the closed mode. The DC motor gets normal power supply. When the Cl terminal voltage rises gradually to a certain value, the NAND gate 1 is overturned, the output terminal turns to high level, the start protection circuit stops to work. After that the output mode of NAND gate 3 is the current detection circuit control composed of the RP2, R2, VTl and Ro.