protect the circuit
A technology for protecting circuits and resistors, which is applied in the electronic field to achieve the effect of improving signal accuracy, improving stability and reducing clutter
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Embodiment 1
[0037] Such as figure 1 Shown is a protection circuit provided by the present invention. As can be seen from the figure, the protection circuit includes a signal acquisition module 10, a signal processing module 20, and a power control module 30;
[0038] On the whole, the present invention uses the current sampling unit 101 in the signal acquisition module 10 to sample the voltage of the power supply to be measured. Since the sampled voltage values are small and easy to wear, it cannot be used directly. We pass the sampled voltage through the signal amplifying unit 102 Amplify it, and then pass through the first signal transmission unit 103 to transmit the signal after the square to the signal processing module 20. When the current in the main loop increases, the sampling voltage of the current sampling unit 101 also increases. When the voltage reaches the conversion level of the multi-resonator unit 201, it starts to output a low level, and the trigger unit 202 triggers the le...
Embodiment 2
[0041] Such as figure 2 As shown, when the protection circuit of the present invention is working normally, as the current in the main loop increases, the voltage on the sampling resistors R2 and R3 increases, and the collected voltage is amplified by the amplifier U4, and the photocoupler U5 The signal is transmitted to the multivibrator U3. When the output level of the optocoupler U5 reaches the conversion level of the multivibrator U3, the 3 pin of the multivibrator U3 outputs a low level. Because the four-way RS trigger U1 is low power Level trigger, so when the multivibrator U3 outputs a low level; the 4 pins of the four-channel RS flip-flop U1 also output a low level, thus controlling the 6-channel voltage level converter U2 to output a low level, and the optocoupler U6 The low-level transmission driving unit 301 will be driven by the driving unit 301 to turn off the FET Q1. After the FET Q1 is turned off, the resistor R1 and the resistor R2 are not connected to the main...
Embodiment 3
[0045] On the basis of Embodiment 2, the current sampling unit 101 uses a current transformer as the sampling element. When the sampling current is relatively large, the resistance sampling will be lossy, which reduces the efficiency of the converter. The current transformer is used as the detection element. Improved power efficiency creates certain conditions.
[0046] On the basis of embodiment 2, in order to improve the stability of the oscillation frequency of the multi-resonator unit 201, a quartz crystal can be used to replace the timing elements R and C in the circuit. The impedance of the quartz crystal is the smallest when it resonates in series, while the other The frequency is high impedance, so the oscillation frequency is determined by the series resonance frequency of the quartz crystal.
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