LLC primary side constant current control device and compensation current signal extraction method

A technology of constant current control and compensation current, applied in lighting devices, control/regulating systems, output power conversion devices, etc., can solve the problems of optocoupler device aging, affecting circuit stability, weakening the electrical isolation strength of equipment, etc.

Active Publication Date: 2019-09-24
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • LLC primary side constant current control device and compensation current signal extraction method
  • LLC primary side constant current control device and compensation current signal extraction method
  • LLC primary side constant current control device and compensation current signal extraction method

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Embodiment Construction

[0055] The present invention adopts the primary side feedback control technology to realize the output constant current control of the LLC resonant converter, especially applicable when the converter works in discontinuous mode, and the discontinuous mode of the LLC resonant converter is a well-known technology in this technical field . The present invention is applicable to both the symmetry and asymmetry of the current waveform of the LLC resonant converter.

[0056] First, the principle of the primary side constant current of the present invention is analyzed.

[0057] like image 3 As shown, when the LLC resonant converter is applied in the discontinuous current mode with a symmetrical current waveform, it works under stable output conditions, and the change of the resonant current waveform in the switching cycle includes two parts:

[0058] (1) The first resonance interval [0, Tr / 2]∪[Ts / 2, Ts / 2+Tr / 2]: resonance current i r and excitation current i Lm Not equal, the re...

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Abstract

The invention discloses an LLC primary side constant current control device and a compensation current signal extraction method. The control device receives voltage signals at two ends of a transformer winding of a converter and sampled primary side resonance current signals, extracts first resonance interval current signals from the primary side current shaping signals according to a time interval, shapes the first resonance interval current signals according to the voltage polarity of the transformer winding, adds bias voltage and obtains first resonance interval average current signals after average processing. The method includes the steps of taking the initial and end current values of the shaped and biased primary side current shaping signal in the first resonance interval, summing the initial and end current values to solve the mid-value and obtain a compensation current signal, and subtracting the compensation current signal from the average current signal in the first resonance interval to obtain a signal reflecting the average value of the output current. The invention can omit an optical coupler and a secondary side feedback circuit, and effectively improves the stability of the circuit. In addition, the primary side constant current control device can be further integrated into a single chip, and the circuit cost is further reduced.

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, especially suitable for LLC resonant converters working in discontinuous current mode. 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 requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H05B33/08H05B44/00
CPCH02M3/33569H05B45/00Y02B70/10
Inventor 谢小高刘宽董汉菁
Owner HANGZHOU DIANZI UNIV
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