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

Active Publication Date: 2020-12-01
西安航天计量测试研究所
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Problems solved by technology

In order to achieve the stability of the constant current source, some common constant current source circuits also use negative feedback technology, but due to the complexity of the circuit and high cost, it cannot eliminate external interference well

Method used

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  • A constant current source circuit
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Embodiment Construction

[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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Abstract

The invention provides a constant current source circuit. The constant current source circuit includes a voltage reference circuit, a current generating circuit and an optically isolated negative feedback circuit, wherein the voltage reference circuit includes a voltage reference chip circuit, the current generating circuit includes a first operational amplifier, a second operational amplifier anda third operational amplifier, and the optically isolated negative feedback circuit includes a photocoupler and a triode circuit. The constant current source circuit is advantaged in that the voltagereference circuit generates a standard voltage through voltage division, a standard voltage signal is converted into a current signal by the first operational amplifier, the second operational amplifier and the third operational amplifier, the noise of the circuit can be effectively reduced by the optically isolated negative feedback circuit, the circuit has strong stability, the circuit structure is novel, and strong practicability is realized.

Description

technical field [0001] The invention relates to a constant current source circuit. Background technique [0002] Resistance measurement is divided into two-wire, three-wire and four-wire measurement methods. Because the two-wire measurement method will introduce the resistance of two measurement leads, this method is often used in low-accuracy occasions. The three-wire measurement method can eliminate the error introduced by the resistance of a wire, and is often used in demanding industrial fields. [0003] The four-wire measurement method applies a constant current of a certain value to the measured resistance through a constant current source circuit, and the current passes through the measured resistance to generate a voltage difference, and then measures the voltage difference on the measured resistance through a high-precision voltmeter, according to Ohm's law Calculate to get the actual value of the resistor. Since the four-wire measurement method can effectively r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/14G05F1/56
Inventor 张海飞张建斌史玮强张琪
Owner 西安航天计量测试研究所
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