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Non-isolation step-down LED drive circuit capable of adaptive power supply and working method

A technology of LED drive and power supply circuit, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc. It can solve the problems that a single LED cannot meet the requirements, and achieve the effect of simplifying the structure, realizing charging and discharging, and realizing on-off control

Active Publication Date: 2014-09-17
CHANGZHOU IND TECH RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the power capacity of a single LED has reached 10W, the lighting scheme using a single LED still cannot meet the requirements in lighting occasions that require large areas and high illuminance

Method used

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  • Non-isolation step-down LED drive circuit capable of adaptive power supply and working method
  • Non-isolation step-down LED drive circuit capable of adaptive power supply and working method
  • Non-isolation step-down LED drive circuit capable of adaptive power supply and working method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 and figure 2 As shown, a non-isolated step-down LED drive circuit for self-adaptive power supply, including: a rectification filter circuit, a control module provided with a switching tube, the power supply end of the control module is connected to the output end of the rectification circuit through a resistor R; An adaptive power supply circuit is provided in the control module, the adaptive power supply circuit includes a microprocessor unit, a step-down unit is composed of first and second resistors connected in series, and a PN junction unit composed of several series connected PN junctions simulates Switch unit; the output end of the step-down unit is connected to the input end of the PN junction unit, and the output end is used as the voltage output end of the adaptive power supply circuit; nodes are arranged between the PN junctions, each node respectively connected to each switch input end of the analog switch unit, each switch output end of t...

Embodiment 2

[0031] On the basis of Embodiment 1, the present invention also provides a working method of a self-adaptive power supply non-isolated step-down LED drive circuit, including: the processor unit is adapted to control the analog switch unit according to the sampled voltage value Open or close the corresponding switch to increase or decrease the PN junction in series to stabilize the output voltage of the adaptive power supply circuit; that is, when the sampling voltage value increases, reduce the PN junction in series; if the sampling When the voltage value drops, the PN junction in series is added.

[0032] The current sampling terminal of the control module obtains the current sampling signal I from the cathode of the freewheeling tube VD in the energy storage unit CS , by judging the current sampling signal I CS to control the switching off, on or holding of the switching tube.

[0033] The control module includes: suitable for current sampling signal I CS A sampling resis...

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Abstract

The invention relates to a non-isolation step-down LED drive circuit capable of adaptive power supply and a working method. The non-isolation step-down LED drive circuit comprises a rectification filter circuit and a control module, wherein the power supply end of the control module is connected with the output end of the rectification circuit through a resistor. An adaptive power supply circuit is arranged in the control module. The adaptive power supply circuit comprises a microprocessor unit, a step-down unit, a plurality of Pn junctions connected in series and an analog switch unit. The output end of the step-down unit is connected with the input ends of the Pn junctions in series, and the output end of the step-down unit serves as the voltage output end of the adaptive power supply circuit. Nodes are arranged among the Pn junctions, the nodes are connected with the switch input ends of the analog switch unit respectively, and the switch output ends of the analog switch unit are connected with one another and connected to the ground through a resistor. The power supply end of the processor unit obtains sampling voltage, and the control output ends of the processor unit are respectively connected with the control end of the analog switch unit.

Description

technical field [0001] The invention relates to an LED drive circuit, in particular to a self-adaptive power supply non-isolated step-down LED drive circuit and a working method. Background technique [0002] With the continuous improvement of LED (Light-Emitting Diode) technology, LED as a lighting source has shown the characteristics of high luminous efficiency, long life, fast response and environmental protection, and has begun to replace traditional light sources in many lighting fields. Although the power capacity of a single LED has reached 10W, the lighting scheme using a single LED still cannot meet the requirements for lighting occasions that require large areas and high illuminance. In order to solve this problem, the LEDs are often connected in parallel, series and mixed, and the LEDs are driven by a non-isolated step-down LED drive circuit. The power supply end of the traditional non-isolated step-down LED drive circuit is generally connected to the The energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 张永良唐振宇莫燕红
Owner CHANGZHOU IND TECH RES INST OF ZHEJIANG UNIV
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