A constant current source circuit
A constant current source and circuit technology, applied in the direction of adjusting electric variables, measuring electric variables, measuring resistance/reactance/impedance, etc., can solve problems such as complex circuits, high cost, and inability to eliminate external interference well, and achieve circuit structure Simple, improve stability, and stabilize the effect of the circuit
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[0028] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are not intended to explain the present invention but to limit the present invention.
[0029] like figure 1 As shown, the constant current source circuit in this embodiment includes a voltage reference circuit, a current generation circuit and an optical isolation negative feedback circuit. When it is necessary to measure the resistance value of the resistance to be measured, it also includes a collection circuit for collecting the voltage at both ends of the resistance to be measured. .
[0030] The specific working process is that the voltage reference circuit inputs a standard voltage signal into the current generation circuit through direct connection, voltage division, et...
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