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PWM control conduction XC/DC circuit for LED

A circuit and pulse control technology, applied in electrical components, output power conversion devices, etc., can solve the problems of low efficiency, high power consumption, poor reliability, etc., and achieve the effects of low cost, low power consumption, and high power factor

Inactive Publication Date: 2014-06-11
XIAN ZHIHAI POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a PWM-controlled conduction XC / DC circuit for LEDs, which mainly solves the problems of high power consumption, low efficiency and poor reliability of existing low-voltage new energy power converters

Method used

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  • PWM control conduction XC/DC circuit for LED
  • PWM control conduction XC/DC circuit for LED
  • PWM control conduction XC/DC circuit for LED

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Embodiment Construction

[0022] The LED uses PWM control to turn on the XC / DC circuit, including a load, and the input end of the load is connected to the output end of the input power supply through an energy storage filter circuit, a reverse isolation circuit, a VMOS control circuit, and a freewheeling inductor in sequence; The output end of the energy storage filter circuit is connected to the input end of the width-adjustable pulse control circuit through the output current sampling circuit, and the output end of the input power supply is connected through the input current sampling circuit and the input end of the width-adjustable pulse control circuit. The output end of the formula pulse control circuit is connected with the input end of the VMOS switch circuit through the drive signal synthesis circuit and the VMOS switch drive circuit in turn, and the input end of the drive signal synthesis circuit is connected with the output end of the VMOS switch circuit through the freewheeling voltage sampl...

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Abstract

The invention provides a PWM control conduction XC / DC circuit for an LED. The circuit is in a wave-shaped positive half cycle when alternating currents are input or is positive up and negative down when direct currents are input. When one of control signals P1 and control signals P2 output by a PWM control circuit (IC1) is in high level, the XC / DC automatic orientation BOOST circuit is in a PWM conduction state, and the currents sequentially flow through a first set of VMOS switching circuit sets (M1 and M2) and a second set of VMOS switching circuit sets (M3 and M4) from the positive end in an input circuit, and then flow back to the negative end. Due to the fact that a D3 plays a role of reverse isolation, stored energy in a C14 can not reversely flow back to the input circuit. The problems that an existing low voltage new energy power adapter is high in power consumption, low in efficiency and poor in reliability are solved.

Description

technical field [0001] The invention relates to a power conversion circuit. Background technique [0002] In recent years, photovoltaic power generation, wind power generation, battery power supply and other renewable new energy systems with AC low voltage and DC low voltage power supply have been widely used. It is imperative to improve the power supply efficiency, power supply quality and power supply reliability of low voltage new energy power supply systems. [0003] At present, the power conversion known in the art basically adopts: [0004] 1. AC (AC) input, using a full-wave rectifier to rectify the input AC (AC) power to DC (DC) power, and then convert DC / DC to DC (DC) output. This kind of scheme solves the conversion problem of higher input voltage AC power supply and low-power power supply. However, when low-voltage AC power input and high-power power conversion, because the voltage drop of the AC / DC rectifier circuit is relatively high, high power consumption is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088H02M1/32
Inventor 胡家培胡民海
Owner XIAN ZHIHAI POWER TECH
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