Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

An Energy Feedback LLC Resonant Converter Light Load Voltage Modulation System and Modulation Strategy

A resonant converter, voltage modulation technology, applied in control/regulation systems, output power conversion devices, conversion of DC power input to DC power output, etc., can solve the problems of large output voltage ripple and large loss, and achieve stable Effect of output voltage

Inactive Publication Date: 2020-02-14
HUBEI POLYTECHNIC UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an energy feedback LLC resonant converter light-load voltage modulation system and modulation strategy in view of the defects of large loss and large output voltage ripple in the prior art

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
  • An Energy Feedback LLC Resonant Converter Light Load Voltage Modulation System and Modulation Strategy
  • An Energy Feedback LLC Resonant Converter Light Load Voltage Modulation System and Modulation Strategy
  • An Energy Feedback LLC Resonant Converter Light Load Voltage Modulation System and Modulation Strategy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0045] Such as figure 1 As shown, the energy feedback LLC resonant converter light-load voltage modulation system of the embodiment of the present invention includes a power supply, a half-bridge conversion circuit, a resonant network circuit, a high-frequency transformer, a current doubler rectifier circuit and an output load; wherein:

[0046] The half-bridge conversion circuit includes a first power transistor Q1 and a second power transistor Q2 connected in series; the drain of the first power transistor Q1 of the half-bridge conversion circuit is connected to the positive pole of the power supp...

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 discloses an energy feedback LLC resonant converter light-load voltage modulation system and modulation strategy. The system includes a power supply, a half-bridge conversion circuit, a resonant network circuit, a high-frequency transformer, a current doubler rectifier circuit and an output load; the strategy Using the structure of the synchronous rectifier tube on the secondary side of the high-frequency transformer, when the system is working at light load, the output capacitor can feed back energy to the power supply side by adjusting the phase shift angle of the power tube on the primary side of the high-frequency transformer and the synchronous rectifier tube on the secondary side , to reduce the light-load output voltage, and at the same time stabilize the output voltage at the rated voltage according to the relationship between the input and output voltages of the system. The invention solves the problem of pumping up the output voltage of the LLC resonant converter under light load through the modulation strategy, stabilizes the output voltage, does not need to increase hardware costs, and does not have problems such as reduced efficiency, limited application range, and large output voltage ripple. There are great prospects for industrial applications.

Description

technical field [0001] The invention relates to the technical field of LLC resonant converters, in particular to an energy-feedback LLC resonant converter light-load voltage modulation system and a modulation strategy. Background technique [0002] As a kind of DC resonant converter, LLC converter is widely used in DC conversion fields such as communication voltage and battery charging because of its advantages such as wide voltage regulation range, high efficiency, and no need for filter inductors on the output side. However, due to the parasitic capacitance of the transformer and power tube and the reason of load interruption, the LLC converter has the problem that the output voltage pump is difficult to adjust under light load, which makes the closed-loop control of the converter become unstable under light load, and the endurance of the power tube The voltage needs to select a larger margin, and the load is damaged because the voltage is higher than the rated value. Thes...

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 Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10
Inventor 胡国珍方支剑李伟雷
Owner HUBEI POLYTECHNIC UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com