A Digital Load Adaptive Constant Current Driver

A constant current driver, self-adaptive technology, applied in instruments, control/regulating systems, regulating electrical variables, etc., can solve problems such as load or instrument damage, output current exceeding the limit current, etc.

Inactive Publication Date: 2020-10-20
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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  • A Digital Load Adaptive Constant Current Driver
  • A Digital Load Adaptive Constant Current Driver
  • A Digital Load Adaptive Constant Current Driver

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 Overall structure of the present invention

[0035] Overall structure of the present invention is as figure 1 As shown, there are single-chip microcomputer 1, digital-to-analog conversion module 2, power output module 3, load judgment module 4, delay compensation module 5, voltage tracking module 6, over-current judgment module 7, power-off protection module 8, input module 9, Display module 10, analog-to-digital conversion module 11, reference voltage module 12, power management module 13 and front panel 14; wherein, single-chip microcomputer 1 is connected with display module 10, input module 9, analog-to-digital conversion module 11, digital-to-analog conversion module 2 respectively , the digital-to-analog conversion module 2 is connected to the power output module 3, the power output module 3 is connected to the analog-to-digital conversion module 11, the load judgment module 4, and the overcurrent judgment module 7 respectively, the reference voltage ...

Embodiment 2

[0036] Embodiment 2 The power output module of the present invention

[0037] The schematic circuit diagram of the power output module 3 is as follows image 3 As shown, one end of the switch of the relay EK1 is used as the first input end of the power output module 3, which is marked as port PWR-in1, and the other end is connected to the drain of the field effect transistor Q1, and is used as the first output end of the power output module 3 terminal, denoted as port PWR-out1, one end of the coil of relay EK1 is connected to the power supply Vdd, and the other end is used as the second input terminal of power output module 3, denoted as port PWR-in2, the gate of FET Q1 is connected to the operational amplifier The output terminal of U1A is connected, and the source is used as the second output terminal of the power output module 3, which is recorded as port PWR-out2. The input end is marked as port PWR-in3, and the other end of resistor R1 is used as the fourth input end of ...

Embodiment 3

[0039] Embodiment 3 The load judging module of the present invention

[0040] The principle circuit of the load judging module 4 is as Figure 4 As shown, the non-inverting input terminal of the operational amplifier U2A is used as the first input terminal of the load judgment module 4, which is denoted as port Vjdg-in1, and is connected to the port PWR-out1 of the power output module 3, and the inverting input terminal of the operational amplifier U2A is connected to the The output terminal of operational amplifier U2A is connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R6 and the same-inverting input terminal of operational amplifier U3A, the other end of resistor R6 is grounded, and the output terminal of operational amplifier U3A is connected to the in-phase input terminal of operational amplifier U3A. One end is connected to one end of the resistor R9, the other end of the resistor R8 is connected to the inverting input...

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Abstract

The invention discloses a digital loading self-adaptive constant-current driver and belongs to the technical field of electronic devices. The digital loading self-adaptive constant-current driver mainly structurally comprises a single chip microcomputer (1), a digital-to-analogue conversion module (2), a power output module (3), a loading judgement module (4), a delay compensation module (5), a voltage tracking module (6), an outage protection module (8) and the like. When the digital loading self-adaptive constant-current driver works, the driver can actively adapt to the change of load and has the advantages of being high in efficiency, wide in loading application range, high in safety and reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment. It particularly relates to a digital load adaptive constant current driver. 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 digital program-controlled constant current source" (application number: 2016108010566) appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/565G05F1/573
CPCG05F1/565G05F1/573
Inventor 吴戈聂鸿宇汝玉星高博胡佳琪彭小乙李余隆
Owner JILIN UNIV
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