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The automatical overcurrent protection circuit of 555 motor
2016-09-02 04:27
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As shown in the figure 10-10, the overcurrent protection circuit is made as the core of 555 which is connected into R-S trigger pattern. In the figure, M is DC motor which is needed to limit current or regulate speed. 555's 6 foot(R terminal)connects high level, 2 foot(S terminal)is connected between M and sample resistor R4. RP1 is used to adjust the control terminal's(5 foot)voltage, namely, adjusting R terminal's and S terminal's threshold voltages. When it works normally, adjusting RP1, R4's sample voltage is lower than S terminal's threshold level, 555 is set, VT1 is saturation conduction, M operates normally.
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