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Light load control structure of power supply using logic link control (LLC) topology

A technology for controlling structure and power supply, applied in electric light sources, control/regulation systems, light sources, etc., and can solve problems such as light flickering

Inactive Publication Date: 2012-07-04
ADPOWER TECH WUXI
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  • Description
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Problems solved by technology

[0004] In view of the problem in the traditional technology that the frequency uncontrollable intermittent operation of LLC light load is likely to cause light flickering, the present invention proposes a light-load control structure using an LLC topology power supply, which uses the power supply to enter a frequency-controllable intermittent working mode , so as to prevent the occurrence of light flicker

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  • Light load control structure of power supply using logic link control (LLC) topology
  • Light load control structure of power supply using logic link control (LLC) topology
  • Light load control structure of power supply using logic link control (LLC) topology

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Embodiment Construction

[0014] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0015] figure 1 A compositional block diagram of the present invention is shown. Such as figure 1 As shown, in the power supply using the LLC topology, the present invention is composed of an output signal acquisition module A, a triangular wave generator B, a comparator C and an LLC control module D. figure 1 The remainder in is a switching power supply using the LLC topology. Among them, the output signal acquisition module A is connected to the output terminal of the LLC power supply and connected to the inverting terminal of the comparator C; the triangular wave generator B is connected to the non-inverting terminal of the comparator C; the output terminal of the comparator C is connected to the LLC control module C Connection; the LLC control module C is connected to the switching tube of the LLC power supply.

[0016] The comparato...

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Abstract

The invention discloses a light load control structure of a power supply using logic link control (LLC) topology, which is composed of an output signal collection module, a triangular wave generator, a comparator and an LLC control module. The comparator compares feedback signals output by the signal collection module with triangular waves having fixed frequency and amplitude and output by a triangular wave generator so that pulse width modulation (PWM) signals with fixed frequency and duty ratio changing along with load are generated, intermittent working of the LLC control module is controlled, and a problem that a light-emitting diode (LED) lamp twinkles when light load outputs by using the LLC topology as LED driving is solved radically.

Description

technical field [0001] The invention belongs to the control structure of a switching power supply, in particular to a control structure of a power supply using LLC topology suitable for LED lighting. Background technique [0002] LED is a display device with excellent performance, which has the advantages of long life, energy saving, high brightness, various luminous colors, fast response speed and low driving voltage. While saving energy, it can also adjust the LED luminous intensity, change the luminous color, and realize various display effects. Now it is widely used in urban lighting, architectural landscape lighting, stage lighting design and other fields. [0003] In dimming applications, commonly used dimming methods include PWM dimming and linear dimming. PWM dimming refers to quickly controlling the on and off of LED lamp beads, so as to achieve the purpose of adjusting brightness. Linear dimming refers to changing the current flowing through the LED lamp beads, ...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M3/335
Inventor 林万辉
Owner ADPOWER TECH WUXI
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