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Flyback converter controlled constant-current output circuit

A flyback converter, constant current output technology, applied in the direction of converting DC power input to DC power output, lamp circuit layout, control/regulation system, etc. Power factor correction, eliminating high voltage input electrolytic capacitors, and prolonging service life

Active Publication Date: 2014-07-02
绍兴恒力特微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The switching frequency is not fixed, but is determined by the discharge time of the secondary diode terminal. The variability of switching frequency increases the difficulty of transformer design

Method used

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  • Flyback converter controlled constant-current output circuit
  • Flyback converter controlled constant-current output circuit
  • Flyback converter controlled constant-current output circuit

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Embodiment 1

[0020] A flyback converter control constant current output circuit, with image 3 The peripheral circuits are similar, including rectifier bridge, transformer, MOS tube power switch, power switch controller B1, secondary rectifier diode D1, output filter capacitor C6, output feedback third winding, the difference is that a constant The switching frequency is adjusted by the external resistor or built-in resistor in the peripheral circuit, so the original power switch controller will also be adjusted accordingly, such as Figure 4 and Figure 6 As shown, the power switch controller B1 includes a first sampling circuit S / H, a second sampling circuit S / H, an SR latch circuit, a reference voltage circuit V REF , Amplifier circuit A1, error amplification comparison circuit A3, comparison circuit A2, oscillator circuit, drive circuit;

[0021] The output end of the first sampling circuit S / H is connected to the first R end of the SR latch circuit and one end of the error amplifica...

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Abstract

The invention discloses a flyback converter controlled constant-current output circuit and a flyback converter controlled constant-current output method. The flyback converter controlled constant-current output circuit comprises a rectifier bridge used for controlling rectified output, a transformer, a metal oxide semiconductor (MOS) tube power supply switch, a power supply switch controller B1, a secondary rectifier diode D1, an output filter capacitor C6 and an output feedback tertiary winding. The power supply switch controller B1 comprises a first sampling circuit, a second sampling circuit, a set-reset (SR) latch circuit, a reference voltage circuit, an amplifier circuit A1, an error amplification and comparison circuit A3, a comparison circuit A2, an oscillator circuit and a drive circuit. The design of an electromagnetic interference filter and the transformer is effectively simplified through constant pulse width modulation (PWM) frequency; a high-voltage input electrolytic capacitor, an input resistance divider and an optical coupler are omitted, the service life is prolonged and a high power factor correction function is provided; and the high power factor correction function is realized through the input feedback voltage of the tertiary winding and a compensating capacitor C4 but not the input resistance divider.

Description

technical field [0001] The invention relates to a flyback converter driving a constant current output, in particular to a flyback converter driving a constant current output circuit and a method for driving a LED current constant output. Background technique [0002] LED lighting has been widely used in enterprise lighting, commercial application lighting and residential lighting. In recent years, more and more lighting devices have begun to use LED lighting devices. Many countries have also formulated a timetable for phasing out traditional incandescent lamps. The remaining options are energy-saving lamps and LED lamps, which are comparable to incandescent lamps with the same lighting effect. Compared with energy-saving lamps, it can save more electricity, but it contains mercury metal elements, which will cause great pollution to the environment. In addition, CFLs have a limited lifespan compared to LED lights. LED lamps are developing rapidly and require constant curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/42H05B37/02
CPCY02B70/126Y02B70/10
Inventor 陈龙
Owner 绍兴恒力特微电子有限公司
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