Constant current source generation circuit

Abstract

The invention relates to a constant current source generation circuit, in particular to a constant current source generation circuit which is suitable for controlling current magnitude with direct current voltage, belonging to the technical field of an electronic circuit. The constant current source generation circuit comprises a sample amplifier U1, a summator U2, a triode N1, resistors R1, R2, R3, R4 and R5, a load and a power supply that are in circuit connection, wherein the sample amplifier U1 has sampling action for the power supply and is used for sampling the potential of the load, the summator U2 is an addition operation amplifier, the positive potential of the summator U2 is an intermediate value of the sample potential and the precise normal potential, and through two times of feedback amplification, the positive potential of the summator U2 is the sum of the sample potential and the precise normal potential; the output of the summator U2 is connected with a common base of the triode N1 to control the voltage output of the common base, the change the summator U2 is changed along with the change of the load sample, and then the voltage output is regulated by the triode N1 to reach potential balance. The constant current source generation circuit has the characteristics that the precision and the load power are improved, the circuit structure is simple, the cost is low, the control is easy, etc.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a constant current source generation circuit suitable for controlling the magnitude of current with a DC voltage. Background technique [0002] As we all know, the generation of a constant current source generally consists of a power supply, a constant current source and a load. Use shunt regulator, op amp, and transistor to form a simple constant current source circuit (as attached figure 1 shown), to achieve a constant current. The use of components is less, the structure is relatively simple, but the range of power utilization is small, and the accuracy is relatively poor. Or directly use the constant current source chip (as attached figure 2 shown), such as XTR110KP, has high precision but still has limitations. The power supply voltage cannot exceed 40V, the maximum current is 200mA, and the temperature drift of components is very high. Contents of the inve...

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Problems solved by technology

Less components are used and the structure is relatively simple, but the range of power utilization is small and the accuracy is relatively poor

Or directly use the constant current source chip (as attached figure 2 As shown), such as XTR110KP, the accuracy is very high but there are still limitations, the power supply voltage cannot exceed 40V, the maximum current is 200mA and the temperature drift interference of components is very high

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