Check patentability & draft patents in minutes with Patsnap Eureka AI!

Alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination

A technology of AC drive and conversion circuit, applied in the direction of converting AC power input to DC power output, lamp circuit layout, DC power input conversion to DC power output, etc., to achieve the effects of low manufacturing cost, easy maintenance, and simple structure

Inactive Publication Date: 2012-09-19
SUIZHONG ZHONGWEI TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to realize the problem that the existing LED lights are powered by AC 220 volts, the present invention proposes a PFC conversion circuit for AC driving LED white light lighting

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] As shown in the figure, the circuit composition and connection:

[0011] The collector of the first switching tube Q1 is connected to the cathode of the first diode D1, one end of the first capacitor C1, and one end of the AC power supply; the collector of the second switching tube is connected to the cathode of the second diode D2 and one end of the second capacitor C2 at the same time , connected to the other end of the AC power supply; after the emission set of the switching tube is connected, it is connected to the collector of the third switching tube Q3, and the emitting set of the third switching tube Q3 is connected to one end of the inductor L1 and the negative set of the Schottky diode D3; The anode of the Kit diode is connected to the end of the third capacitor D3 and one end of the current detection resistor R0; the anodes of the first diode D1 and the second diode D2 are connected to the other end of the inductor L1 and the third capacitor C3, and are connec...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination. Q1 is connected to one end of D1, C1 and an alternating current power supply, D2 is connected to the other end of C2 and the alternating current power supply, a switching tube is connected and then is connected with Q3, the Q3 is connected with one end of L1 and D3, an anode of the D3 is connected with one end of C3 and R0, anodes of the D1 and the D2 are connected with the other end of the L1 and the C3 and connected with a positive electrode of an LED, a negative electrode of the LED is connected with the other end of the R0, an output end of an MCU (micro-programmed control unit) / DSP (digital signal processor) is respectively outputted to base electrodes of the Q1, Q2 and the Q3, one end of the R0 connected the D3 is connected with an analog grounding end of the MCU / DSP, and a positive electrode of an LED illuminating lamp and the other end of the R0 is connected to an analog-digital input end of the MCU / DSP. The PFC changing circuit has the advantages of simple structure, low cost, small heating value, easiness in maintenance and long service life, and is suitable for application of the LED illuminating lamp driven by alternating current.

Description

technical field [0001] The invention relates to a PFC conversion circuit for alternating current driving LED white light illumination in the field of electric appliance control. Background technique [0002] In equipment with adjustable input voltage in a wide range, especially for high-voltage input, in order to obtain a suitable bus voltage, a converter with buck-boost characteristics must be used. The cascaded Buck-Boost PFC circuit is very suitable for wide-range voltage input, especially high-voltage input occasions, because of its small voltage and current stress. [0003] However, the cascaded Buck-Boost PFC circuit is composed of a bridge rectifier circuit and a Buck-Boost converter, and there are always four semiconductor devices in the conducting state in the circuit at any moment. With the increase of converter power level and switching frequency, the on-state loss of the system increases significantly, and the overall efficiency decreases. Contents of the inve...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M3/155H05B37/02
Inventor 毕建莹
Owner SUIZHONG ZHONGWEI TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com