LED constant-current drive circuit controlled through LLC resonance

A technology of constant current drive and resonance control, which is applied in the direction of electrical components, can solve the problems of increasing costs, and achieve the effects of improving response speed, shortening start-up delay time, and reducing circuit costs

Pending Publication Date: 2020-01-17
SUZHOU KAIWEITE SEMICON +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, a PFC (power factor correction) circuit needs to be connected between the LLC resonance control circuit and the input power supply, and the primary side power tube of the LLC resonance needs to be driven by a transformer, which increases the cost of the solution application

Method used

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  • LED constant-current drive circuit controlled through LLC resonance
  • LED constant-current drive circuit controlled through LLC resonance
  • LED constant-current drive circuit controlled through LLC resonance

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Embodiment Construction

[0021] In order to deepen the understanding and recognition of the present invention, the present invention will be further described and introduced below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, it is a LED constant current drive circuit controlled by LLC resonance shown in a preferred embodiment of the present invention, including a rectifier circuit, a half-bridge drive chip IC1, a first power transistor N1, a second power transistor N2, and a resonant inductor L1, resonant capacitor C4, first transformer T1, second transformer T2, first to fifth diodes, first to third capacitors, fifth to sixth capacitors, first resistor Rcs, second resistor Rfb2 and the first Three resistors Rfb1, the rectification circuit is realized by a full-bridge rectification circuit composed of four diodes, the positive output terminal of the rectification circuit is connected to the VIN pin of the half-bridge driver chip IC1 through the fourth diode D4, an...

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PUM

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Abstract

The invention relates to an LED constant-current drive circuit controlled through LLC resonance. The drive circuit comprises a half-bridge driving chip, a full-wave rectification circuit, a half-waverectification circuit, a current sampling circuit and a PFC circuit. A first power thyristor and a second power thyristor are controlled by the half-bridge driving chip, the first power thyristor, thesecond power thyristor, a resonant inductor, a second transformer and a resonant capacitor form an LLC resonant loop, and the full-wave rectification circuit is externally connected with an LED load;the half-wave rectification circuit supplies power to the half-bridge driving chip after the LLC resonance loop is started, the current sampling circuit converts a current signal of the LLC resonanceloop into a voltage signal and feeds back the signal to the half-bridge driving chip, and the PFC circuit is formed by utilizing the LLC resonance signal of the LLC resonance loop and is responsiblefor correcting the power factor of the circuit. According to the circuit, the LLC resonant power thyristors are directly controlled by the half-bridge driving chip, so that a driving transformer of the power thyristors is saved, and the response speed is improved; meanwhile, the LLC resonant signal is utilized to form the PFC circuit, so that a special PFC circuit is saved, and the cost of the circuit is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of LED constant current drive, in particular to an LED constant current drive circuit controlled by LLC resonance. Background technique [0002] The LED constant current drive circuit of LLC resonant topology has become the development direction of the industry because of its excellent performance. The LLC resonant primary side power tube works in ZVS (Zero Voltage Switching) mode, with low switching loss and high efficiency. At the same time, the LLC resonant circuit has few peripheral components and low application cost. Therefore, the LED constant current drive circuit controlled by LLC resonance has become the first choice of many manufacturers. [0003] Usually, a PFC (power factor correction) circuit needs to be connected between the LLC resonance control circuit and the input power supply, and the primary side power tube of the LLC resonance needs to be driven by a transformer, which increases the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/36
Inventor 罗寅张胜丁国华谭在超
Owner SUZHOU KAIWEITE SEMICON
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