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Constant current source circuit capable of improving precision of constant current source

A constant current source and circuit technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems affecting the accuracy of constant current source circuits, and achieve the effects of low cost, improved accuracy, and easy implementation

Inactive Publication Date: 2011-01-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the disadvantage of this circuit is that the regulated current I of the three-terminal shunt regulator U1 a Simultaneously sink into the current I o , which affects the accuracy of the constant current source circuit
Obviously, the disadvantage of this circuit is that the regulated current I' of the three-terminal series regulator U2 a At the same time sink into the current I' o , which affects the accuracy of the constant current source circuit

Method used

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  • Constant current source circuit capable of improving precision of constant current source
  • Constant current source circuit capable of improving precision of constant current source
  • Constant current source circuit capable of improving precision of constant current source

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Embodiment approach 1

[0021] The constant current source circuit of the present invention is as image 3 As shown, this circuit is for figure 1 An improvement of the constant current source circuit shown.

[0022] exist image 3 In the shown constant current source circuit, the negative input terminal of the operational amplifier U3 is connected to the common terminal A of the three-terminal shunt regulator U1, and the conduction resistor R7 is connected between the negative input terminal of the operational amplifier U3 and the power ground Gnd. The output terminal of the operational amplifier U3 is connected to the base of the transistor Q1, the output terminal C of the three-terminal shunt regulator U1 is connected to the base of the transistor Q1, and the dropping resistor R1 is connected between the power supply Vcc and the base of the transistor Q1. The collector of the triode is connected to the power supply Vcc, and the emitter of the triode is connected to the regulating terminal R of th...

Embodiment approach 2

[0035] The constant current source circuit of the present invention is as Figure 4 As shown, this circuit is for figure 2 An improvement of the constant current source circuit shown.

[0036] exist Figure 4 In the shown constant current source circuit, the operational amplifier U4 is used to build a voltage follower. The negative input terminal of the operational amplifier U4 is connected to the adjustment terminal A of the three-terminal series voltage regulator U2, and the output terminal of the operational amplifier U4 is connected to the adjustment terminal A of the three-terminal series voltage regulator U2. The reference resistor R4 is connected between the positive input terminal of the operational amplifier U4 and the output terminal O of the three-terminal series regulator U2. The compensation resistor R8 is connected between the positive input terminal of the operational amplifier U4 and the load R5. The load R5 is connected between the compensation resistor R...

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Abstract

The invention relates to a constant current source circuit capable of improving the precision of a constant current source. The constant current source circuit is structured by a three-terminal shunt regulator and comprises the three-terminal shunt regulator, a dropping resistor, a power supply, a reference resistor, a load, a triode, an operational amplifier, a guide resistor and a compensating resistor, wherein the common terminal of the three-terminal shunt regulator is connected with the negative input end of the operational amplifier; the guide resistor is connected between the negative input end of the operational amplifier and a power ground (Gnd); the output end of the three-terminal shunt regulator is connected with the output end of the operational amplifier; the reference resistor is connected between the adjusting end of the three-terminal shunt regulator and the positive input end of the operational amplifier; the dropping resistor is connected between a Volt Current Condenser (Vcc) and a base of the triode; the base of the triode is connected with the output end of the operational amplifier; a collector of the triode is connected with the Volt Current Condenser (Vcc); an emitter of the triode is connected with the adjusting end of the three-terminal shunt regulator; and the compensating resistor and the load are connected between the positive input end of the operational amplifier and the power ground (Gnd).

Description

technical field [0001] The invention relates to a constant current source circuit, in particular to a constant current source circuit for improving the precision of the constant current source. Background technique [0002] With the rapid development of electronic technology, constant current source circuits have been widely used, and constant current source circuits are mainly used in circuits that require high current stability. Such as figure 1 , 2 As shown, using a three-terminal voltage regulator and a reference resistor to form a constant current source has become a simple and fast way to construct a constant current source. [0003] figure 1 Shown is a constant current source circuit constructed by three-terminal shunt regulators commonly used at present. The three-terminal shunt regulator U1 maintains the voltage across the reference resistor R2 at a reference value V Ref , the current I of the constant current source circuit b =V Ref / R2, the current is provi...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 周尧明柳孔明祝明武哲
Owner BEIHANG UNIV