Bypass parallel-connection constant-current source circuit

A technology of constant current source and bypass resistor is applied in the field of bypass parallel constant current source circuit, which can solve the problems of unsatisfactory performance and easy instability of constant current source, and achieve the effect of solving unsatisfactory performance and stable output current.

Pending Publication Date: 2018-03-27
深圳睿舍智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a bypass parallel constant current source circuit, which has stable output current and solves the problems of unsatisfactory performance and easy instability of traditional constant current sources.

Method used

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  • Bypass parallel-connection constant-current source circuit
  • Bypass parallel-connection constant-current source circuit
  • Bypass parallel-connection constant-current source circuit

Examples

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Embodiment 1

[0022] Example 1: Please refer to figure 1 As shown, a bypass parallel constant current source circuit includes a controlled constant current source and a load RL, and also includes a controllable load connected in parallel to the load RL, wherein the controllable load includes There are operational amplifier IC1, reference power supply, bypass resistor R1, and feedback unit. One end of bypass resistor R1 and one end of load RL are connected to the positive pole of the controlled constant current source, and the other end of bypass resistor R1 is connected to the controlled constant current source. The negative pole of the source is connected, the other end of the load RL is connected to the negative pole of the controlled constant current source through the sampling resistor R2, one end of the load RL is connected to the inverting input end of the operational amplifier IC1 through the feedback unit, and the output end of the operational amplifier IC1 is respectively connected...

Embodiment 2

[0024] Example 2, please refer to figure 2 As shown, further, it also includes a MOS transistor Q1, the source of the MOS transistor Q1 is connected to the positive electrode of the controlled constant current source, the gate of the MOS transistor Q1 is connected to the output terminal of the operational amplifier IC1, and the MOS transistor Q1 The drain is connected to one end of the bypass resistor R1. Using the above scheme, the MOS tube is used to change the voltage to control the current characteristics, and the driving capability of the MOS tube Q1 is greater than that of the operational amplifier IC1, so that the current flowing from the MOS tube Q1 can be larger. .

[0025] The use principle of the present invention is as follows: current I0 is the total current in the circuit, current I0 is the current of the load RL plus the current flowing through the side resistor R1, and the sampling resistor R2 is used to detect the voltage flowing through the load RL and pass ...

Embodiment 3

[0026] Example 3: Please refer to image 3As shown, a bypass parallel constant current source circuit includes a controlled constant current source and a load RL, and also includes a controllable load connected in parallel to the load RL, wherein the controllable load includes There are operational amplifier IC1, reference power supply, bypass resistor R1, feedback unit and operational amplifier IC2 for current detection, one end of the bypass resistor R1 is connected to the positive pole of the controlled constant current source, and the other end is connected to the controlled constant current source The negative pole of the sampling resistor R2 is connected to the positive pole of the controlled constant current source, and the other end is connected to the negative pole of the controlled constant current source through the load RL. The output terminal of the operational amplifier IC2 is connected to the inverting input terminal of the operational amplifier IC1 through the ...

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Abstract

The present invention relates to the field of electronic circuits, especially to a bypass parallel constant current source circuit. The present invention includes a controllable load connected in parallel to the load and the controllable load includes an operational amplifier IC1 and a feedback unit , the current on the bypass circuit flows to the operational amplifier IC1 through the feedback unit, and the operational amplifier IC1 outputs a current corresponding to the main circuit according to the feedback current, so as to achieve the effect of constant output current, and has the characteristics of stable output current. It solves the problem of unsatisfactory performance and easy instability of the traditional series constant current source and improves the power efficiency.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a bypass parallel constant current source circuit. Background technique [0002] The constant current source is a component widely used in the circuit. The constant current source is a current source that keeps the output current constant. The essence of the constant current source is to use the device to feedback the current and dynamically adjust the power supply status of the device, so that the current tends to be constant. . As long as the current can be obtained, feedback can be effectively formed to establish a constant current source. [0003] Such as Figure 6 As shown, the common controlled constant current source circuit is composed of MOS tube, diode and multiple resistors. Among them, in order to ensure the stability of the drain current of the MOS tube, the drain of the MOS tube is connected to the cathode of the diode, and the diode’s The anode is connected to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 李冲
Owner 深圳睿舍智能科技有限公司
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