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LED driving circuit

A circuit and main circuit technology, applied in the circuit field, can solve problems such as LED load flickering or flickering, achieve the effect of solving flickering or flickering, increasing hiccup frequency, and reducing current ripple

Active Publication Date: 2015-12-23
INVENTRONICS HANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides an LED drive circuit. In the hiccup mode, when the LED load is light, the hiccup frequency can be increased, so that the current ripple output by the LED driver becomes smaller, thereby solving the problem of flickering or flickering of the LED load

Method used

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Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0052] like figure 1 As shown, the present application provides an LED driving circuit, including: a resonant conversion main circuit 100 and a control circuit 200 . The control circuit 200 includes: a comparison circuit 201 , a setting circuit 202 and a parameter conversion circuit 203 .

[0053] The resonant conversion main circuit in this application can be any resonant conversion circuit controlled by frequency conversion, such as LLC resonant conversion circuit, LCC resonant c...

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Abstract

The invention provides an LED driving circuit. The LED driving circuit is characterized by comprising a resonance transformation main circuit and a control circuit. The control circuit comprises a comparison circuit, a setting circuit and a parameter transformation circuit. The control circuit detects output currents and output voltages of the resonance transformation main circuit, superposes the output currents and the output voltages as currently superposed values in the setting circuit, according to the size relation between the currently superposed values and a reference superposed value, decides whether the parameter transformation circuit is at a rapid loop state or a slow loop state, and accordingly controls the response speed of the comparison circuit in outputting control signals. In such a way, when the output currents are quite small and the output voltages are quite low, the resonance transformation main circuit, if entering a hiccup mode, can enable the control circuit to rapidly respond to the output voltages and the output currents of the resonance transformation main circuit so that the hiccup efficiency is improved, current ripples output by the resonance transformation main circuit are reduced, and the stroboscopic or scintillation phenomenon of an LED load connected with an LED driver is solved.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to an LED driving circuit. Background technique [0002] At present, as a new type of lighting device, LED is widely promoted in the field of lighting due to its advantages of high luminous efficiency, long life and no pollution. In the process of using the LED, an LED driver is required to drive the LED to emit light. Among them, medium and high-power LED drivers often use high-efficiency resonant conversion topology as the conversion of DC / DC constant current control. [0003] The LED driver includes a resonant conversion main circuit and a control circuit. Generally, the operating frequency of the resonant conversion main circuit is inversely proportional to the change of the LED load, that is, the lighter the LED load, the higher the operating frequency of the resonant conversion main circuit. However, the operating frequency of the resonant conversion main circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 俞杭冬
Owner INVENTRONICS HANGZHOU
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