Load adaptive constant current source device

A constant current source and self-adaptive technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, etc., can solve problems such as load or instrument damage, output current exceeding the limit current, etc.

Inactive Publication Date: 2019-02-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the technical solution disclosed in the above-mentioned patent does not have an over-current power-off protection function. 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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Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1 Overall structure of the present invention

[0039] The overall structure of the present invention is as figure 1 As shown, there are current setting module 1, limit setting module 2, power output module 3, load judgment module 4, delay compensation module 5, voltage tracking module 6, overcurrent judgment module 7, power failure protection module 8, display driver Module 9, reference voltage module 10, power management module 11, front panel 12; among them, current setting module 1 is connected to limit setting module 2, and limit setting module 2 is also connected to power output module 3 and display drive module 9, respectively, The power output module 3 is respectively connected to the display drive module 9, the load judgment module 4, and the overcurrent judgment module 7, the reference voltage module 10 is connected to the load judgment module 4, the load judgment module 4 is connected to the delay compensation module 5, and the delay compensation module 5...

Embodiment 2

[0040] Embodiment 2 The current setting module of the present invention

[0041] The current setting module 1 of the present invention belongs to the prior art, and can be conventionally designed according to actual needs, or can be designed such as image 3 In the structure 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, and the other fixed end of the sliding rheostat W5 is grounded. One end of R38 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 operational amplifier U10B, the inverting input end of the operational amplifier 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 operational amplifier U10B. And as the output terminal of the current setting...

Embodiment 3

[0043] Embodiment 3 The limit setting module of the present invention

[0044] The limit setting module 2 of the present invention belongs to the prior art, and can be conventionally designed according to actual needs, or the structure provided in this embodiment can also be adopted, such as Figure 4 As shown, one end of the resistor R42 is used as the input terminal of the limiter setting module 2, marked as port CL-in, the other end is connected to the non-inverting input terminal of the operational amplifier U11B and the anode of the diode D3, and the negative electrode of the diode D3 is connected to the output of the operational amplifier U10A 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 sliding rheostat W6. One end of the varistor...

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Abstract

The invention discloses a load adaptive constant current source device, which belongs to the technical filed of electronic devices. The main structure of the load adaptive constant current source device comprises a current setting module (1), an amplitude limiting setting module (2), a power output module (3), a load judgment module (4), a delay compensation module (5), a voltage tracking module (6) and a power-off protection module (8), etc. The load adaptive constant current source device can actively adapt to the change of the load during work, and has the advantages of high efficiency, wide load adaptation range, high safety and high reliability.

Description

Technical field [0001] The invention belongs to the technical field of electronic equipment. In particular, it relates to a load adaptive constant current source device. Background technique [0002] Constant current sources have important applications in many fields such as LED driving, laser driving, sensor driving, and various glow discharge light source driving. The basic principle of the constant current source circuit is generally to use the non-linear characteristics of the transistor or the field effect tube 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 prior art closest to the present invention is the Chinese patent "A dual-loop feedback constant current source circuit" (application number: 20151...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 汝玉星孙茂强毕琳旭于广安杨忠岗
Owner JILIN UNIV
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