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Primary side constant current control device and compensation current signal extraction method

A technology of constant current control and compensation current, which is applied in the direction of lighting devices, electric light sources, electrical components, etc., and can solve problems such as aging of optocoupler devices, affecting circuit stability, and weakening the electrical isolation strength of equipment.

Pending Publication Date: 2019-03-12
HANGZHOU DIANZI UNIV
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  • Description
  • Claims
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Problems solved by technology

However, the optocoupler used to achieve isolated feedback has aging problems, which affects the stability of the circuit and weakens the strength of the electrical isolation of the device

Method used

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  • Primary side constant current control device and compensation current signal extraction method
  • Primary side constant current control device and compensation current signal extraction method
  • Primary side constant current control device and compensation current signal extraction method

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Embodiment Construction

[0068] The present invention adopts the primary side feedback control technology to realize the output constant current control of the LLC resonant converter, which is applicable to the converter working in the continuous current mode or discontinuous mode, and the current continuous mode or discontinuous mode of the LLC resonant converter Belong to known technology for this technical field. The present invention is applicable to both the symmetry and asymmetry of the current waveform of the LLC resonant converter.

[0069] First, the principle of the primary side constant current of the present invention is analyzed.

[0070] When the LLC resonant converter is applied in the current continuous mode with symmetrical current waveform, the primary current waveform is as follows image 3 shown. In continuous mode where the current waveform is symmetrical, the analysis can be performed in half a switching cycle since the waveform is the same every half switching cycle

[0071] ...

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Abstract

The invention discloses a primary side constant current control device and a compensation current signal extraction method. The device part comprises an equivalent output current module, an adjustmentring module and a drive control module, wherein the equivalent output current module receives a signal reflecting the winding voltages on both ends of the transformer of the converter and a primary resonance current signal of the converter, generates an average current signal Vpri1_avg and a compensation current signal Vpri2_avg in a first resonance interval, and outputs an output current equivalent signal VIo_est reflecting the average value of the output current after the average current signal Vpri1_avg and the compensation current signal Vpri2_avg in the first resonance interval are added. The primary side constant current control device and compensation current signal extraction method can save the optocoupler and the secondary side feedback circuit, and effectively improve the reliability of the circuit. In addition, the primary side constant current control device can be progressively integrated into a single chip, which further reduces the circuit cost.

Description

technical field [0001] The invention belongs to the switching power supply technology in the technical field of power electronics, and relates to a primary side constant current control device suitable for LLC resonant converters or other types of resonant converters. Background technique [0002] In recent years, light-emitting diodes (LEDs) have been widely used in daily life because of their high brightness, long life, and high efficiency, replacing traditional lighting equipment: incandescent lamps, fluorescent lamps, and metal halide lamps. However, LED is a DC type load, and its luminous brightness directly depends on the forward current flowing through the LED. Therefore, in order to ensure the consistency of the luminance of the LED lamp, it is usually driven by a constant current source. [0003] Based on the consideration of the safety of lighting equipment, many LED lamps require that the LED driver must have an isolation device to achieve electrical isolation be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B70/10
Inventor 谢小高董汉菁
Owner HANGZHOU DIANZI UNIV
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