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A Load Adaptive Constant Current Generating Circuit

A circuit generation and self-adaptive technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as no over-current power-off protection, load or instrument damage, output current exceeding the limit current, etc.

Inactive Publication Date: 2020-10-20
长春昌鼎电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is no over-current power-off protection function in the technical solution disclosed in the above-mentioned patent. Once the current-limiting module fails, it will cause the risk that the output current will exceed the limited current (generally the maximum safe current), resulting in damage to the load or the instrument.

Method used

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  • A Load Adaptive Constant Current Generating Circuit
  • A Load Adaptive Constant Current Generating Circuit
  • A Load Adaptive Constant Current Generating Circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 Overall structure of the present invention

[0034] Overall structure of the present invention is as figure 1 As shown, current setting module 1, limiter setting module 2, power output module 3, load judgment module 4, delay compensation module 5, voltage tracking module 6, overcurrent judgment module 7, power-off protection module 8, reference voltage module 9 and a power management module 10; wherein, the current setting module 1 is connected to the limit setting module 2, the limit setting module 2 is connected to the power output module 3, and the power output module 3 is connected to the load judgment module 4 and the overcurrent judgment module 7, The reference voltage module 9 is connected to the load judgment module 4, the load judgment module 4 is connected to the delay compensation module 5, the delay compensation module 5 is connected to the voltage tracking module 6, the voltage tracking module 6 is connected to the power output module 3, and th...

Embodiment 2

[0035] Embodiment 2 The current setting module of the present invention

[0036] The current setting module 1 of the present invention belongs to conventional technology, can be designed according to specific requirements, and can also adopt the structure provided by this embodiment, such as figure 2 As shown, one end of the resistor R37 is connected to the power supply Vdd, the other end is connected to the cathode of the Zener diode D2 and a fixed end of the sliding rheostat W5, the anode of the Zener diode D2 is grounded, the other fixed end of the sliding rheostat W5 is grounded, and the resistor R38 One end is connected to the sliding wire end of the sliding rheostat W5, the other end is connected to the non-inverting input end of the op amp U10B, the inverting input end of the op amp U10B is connected to one end of the resistor R39, and the other end of the resistor R39 is connected to the output end of the op amp U10B, and used as The output terminal of the current set...

Embodiment 3

[0038] Embodiment 3 Limit setting module of the present invention

[0039] Limiter setting module 2 of the present invention belongs to conventional technology, can be designed according to specific requirements, and the structure provided by this embodiment can also be adopted, such as image 3 As shown, one end of the resistor R42 is used as the input end of the limiter setting module 2, which is recorded as port CL-in, and the other end is connected to the non-inverting input end of the operational amplifier U11B and the positive pole of the diode D3, and the negative pole of the diode D3 is connected to the output of the operational amplifier U10A end and one end of the resistor R41, the other end of the resistor R41 is connected to the inverting input end of the operational amplifier U10A, the non-inverting input end of the operational amplifier U10A is connected to one end of the resistor R40, and the other end of the resistor R40 is connected to the sliding end of the sl...

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Abstract

The invention provides a load-adaptive constant current generating circuit and belongs to the technical field of electronic equipment. The load-adaptive constant current generating circuit mainly structurally comprises a current setting module (1), a limiting amplitude setting module (2), a power output module (3), a load judging module (4), a time-delay compensating module (5), a voltage trackingmodule (6), a power-off protecting module (8) and the like. The circuit can actively adapt to the change of loads during working, and has the advantages of being high in efficiency, wide in load application range, high in safety and reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment. In particular, it relates to a load adaptive constant current generating circuit. Background technique [0002] Constant current sources have important applications in many fields such as LED drive, laser drive, sensor drive, and various glow discharge light source drives. The basic principle of the constant current source circuit is generally to use the nonlinear characteristics of the triode or FET and the deep negative feedback technology to make the output current controlled by the control voltage, and keep the current flowing through the load constant when the load changes. In the constant current source circuit, the stability of the current and the efficiency of the circuit are two crucial parameters. [0003] The existing technology closest to the present invention is the Chinese patent "a double-loop feedback constant current source circuit" (application number: 20151100876...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/573
CPCG05F1/573
Inventor 田小建梁雪邓军刘大凯高鹏彪李尚马春阳由家旭
Owner 长春昌鼎电子科技有限责任公司
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