Isolation-type voltage collecting circuit
A voltage acquisition and isolation technology, applied in the field of isolated voltage acquisition circuit, can solve the problems of complex circuit, poor circuit consistency, slow response speed, etc., and achieve the effect of accurate acquisition results
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[0043] Example 1:
[0044] See figure 1 , figure 2 , An isolated voltage acquisition circuit, including an input voltage adjustment circuit on the input side, a voltage-pulse width conversion circuit, a pulse conversion control circuit, a pulse width signal isolation transmission circuit, a pulse width signal isolation receiving circuit on the isolation side, and a pulse width- Voltage conversion circuit and conversion pulse signal generation circuit; all circuits on the input side are electrically isolated from all circuits on the isolation side, the input end of the input voltage adjustment circuit is connected to the input voltage, the input voltage adjustment circuit, the pulse conversion control circuit and the pulse width signal isolation transmission circuit Both are connected to the voltage-pulse width conversion circuit, the converted pulse signal generating circuit is connected to the pulse conversion control circuit; the pulse width signal isolation receiving circuit i...
Example Embodiment
[0051] Example 2:
[0052] See image 3 , Figure 4 , The difference from the circuit of embodiment 1 is: the conversion pulse signal generating circuit and the pulse width-voltage conversion circuit.
[0053] The conversion pulse signal generating circuit includes an electrically isolated conversion instruction isolation receiving circuit and a conversion instruction isolation sending circuit, the conversion instruction isolation receiving circuit of the optocoupler OC2-s photosensitive transistor emitter is connected to the negative end of the input side power supply, optocoupler OC2 The collector of the phototransistor of -s is connected to transform the pulse signal d; the anode of the light-emitting diode of the optocoupler OC2-p of the transform command isolation transmission circuit is connected to the positive terminal of the isolated side power supply through the resistor R45, and the light-emitting diode of the optocoupler OC2-p The cathode is connected to the collector o...
Example Embodiment
[0055] Example 3:
[0056] See Figure 5 , The difference from the circuit of embodiment 1 is: voltage-pulse width conversion circuit and input voltage adjustment circuit.
[0057] The emitter of the NPN transistor Q20 of the voltage-pulse width conversion circuit is also connected to the collector of the NPN transistor Q22 via a resistor R23, the emitter of the NPN transistor Q22 is connected to the negative terminal of the input side power supply, and the base of the NPN transistor Q22 is The resistor R25 is connected to the anode of the diode D21, the cathode of the diode D21 is connected to the converted pulse signal d, and the base of the NPN transistor Q22 is also connected to the positive terminal of the input side power supply through the resistor R24; when the converted pulse signal d is high voltage, it is no voltage -Pulse width conversion time, NPN transistor Q22 is in the on state, and the voltage across capacitor C20 is discharged through resistor R23 and NPN transist...
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