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High-precision voltage-controlled current source circuit

A voltage-controlled current source, high-precision technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of large area required for PCB production, complex circuit structure, and large number of electronic components, and achieve improved performance. Accuracy and stability, simplifying circuit design, reducing complexity

Inactive Publication Date: 2017-11-03
CHANGZHOU TONGHUI ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this traditional voltage-controlled current source circuit, the output current energy comes from the power supply, which is easily disturbed by power noise; the circuit structure is complex, and the number of electronic components is large; the PCB requires a large area and high cost

Method used

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  • High-precision voltage-controlled current source circuit

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Embodiment Construction

[0018] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0019] Such as figure 2 The schematic diagram of a voltage-controlled current source circuit shown pushes the basic principle of the present invention: set the input reference voltage as Vi, the potential of the non-inverting input terminal of the operational amplifier U1 as Vp, and the potential of the inverting input terminal of the operational amplifier U1 as Vn , the output current is Iout, and the source current of the PMOSFET is Is, then,

[0020] Because of the "virtual break" characteristic of the operational amplifier, the current flowing through the non-inverting input terminal of the operational amplifier U1 is ...

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Abstract

The invention relates to a high-precision voltage-controlled current source circuit comprising a reference voltage Vi, an operational amplifier U1, a PMOSFET (metal-oxide-semiconductor field-effect transistor) Q1, a range measuring resistor Rs, a resistor R1 and a resistor R2. The reference voltage V1 is connected to the inverting input end of the operational amplifier U1 through the range measuring resistor Rs. The reference voltage is connected to the non-inverting input end of the operational amplifier U1 through the resistor R1. The other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is grounded, the output end of the operational amplifier U1 is connected to the gate of the PMOSFET, the source of the PMOSFET is connected to the inverting input end of the operational amplifier U1 to form a negative feedback path, and the drain of the PMOSFET serves as a current output end of a constant current source. Due to the fact that the input reference voltage is adopted to provide output energy to the current source, circuit design is simplified, cost is saved, complexity of the overall circuit is lowered, the circuit suffers from less interference from power supply fluctuations, and accuracy and stability of current are improved.

Description

technical field [0001] The invention relates to the fields of instrumentation and electronic measurement, in particular to a high-precision voltage-controlled current circuit, which can be applied to DC resistance measurement. Background technique [0002] High-precision voltage-controlled current source is a commonly used instrument and equipment in electronic measurement and metering calibration, and is widely used in industrial and mining enterprises and laboratories. [0003] The traditional high-precision voltage-controlled current source circuit is attached figure 1 As shown, the reference voltage Vi, the operational amplifier U1, the power supply VCC of the NMOSFET power transistor Q1, the resistor R1, the resistor R2 and the resistor R4 constitute the first current source; the first current source flows through the resistor R2 to generate a fixed voltage across the resistor R2 According to the concept of "virtual short" and "virtual break" of the operational amplifi...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 赵浩华高志齐孙伯乐刘瑜王怒
Owner CHANGZHOU TONGHUI ELECTRONICS
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