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

Closed loop negative feedback system with low frequency modulated gain

一种负反馈、闭环的技术，应用在控制/调节系统、调节电变量、输出功率的转换装置等方向

Active Publication Date: 2010-11-17
FLEXTRONICS AP LLC
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This dithering approach suffers from many of the drawbacks discussed above

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
  • Closed loop negative feedback system with low frequency modulated gain
  • Closed loop negative feedback system with low frequency modulated gain
  • Closed loop negative feedback system with low frequency modulated gain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] In the following description, numerous details and alternatives are set forth for purposes of illustration. However, one of ordinary skill in the art will recognize that the present invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order not to obscure the description of the present invention in unnecessary detail.

[0023] The present invention provides a technique for reducing EMI emissions without reducing switching frequency. The present invention allows higher switching frequencies without exhibiting undesirable higher harmonic distribution, and further facilitates the delivery of higher order to frequency ranges below the standard EMI bandwidth of 150 kHz by applying low frequency modulation into the feedback loop. Harmonic distribution. The low frequency modulation is injected into the feedback loop and affects the rising and falling edges of the switching pulses o...

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

A power supply apparatus and method of regulating is provided. A clock generator circuit is configured for generating a clock signal at a predetermined frequency. An amplifier circuit is coupled with the clock generator circuit. The amplifier circuit includes a gain circuit coupled with the clock generator circuit. The amplifier circuit is configured to receive the clock signal at a switching element of the gain circuit. A controller circuit is configured for receiving a modulated error signal of the amplifier circuit and is configured for generating a pulse width modulated signal for controlling a duty cycle of the switching circuit. The switching circuit is configured for receiving the modulated error signal. The error signal is modulated using the clock signal to vary a gain value of the gain circuit according to the predetermined frequency. An output circuit is coupled with the switching circuit and is configured for generating a regulated voltage signal. The controller circuit uses the modulated error signal to substantially reduce harmonic distribution in a switching frequency of the switching circuit. Harmonic distribution in the switching circuit can be reduce by 10.0 db or greater.

Description

technical field [0001] The invention relates to the field of power supplies. In particular, the present invention relates to a closed loop negative feedback system with low frequency modulation gain. Background technique [0002] Every piece of electrical equipment connected to the mains is required not to contribute or transmit high-frequency noise to the mains. The amount of electrical emissions allowed by electrical equipment is strictly regulated by the Federal Communications Commission (FCC). Conventional power supply designs have shifted to using higher operating frequencies because higher operating frequencies allow for reduced size of power supply components and allow for reduced cost. The downside of operating at higher frequencies is increased generation of higher harmonics or electromagnetic interference (EMI). [0003] Conventional approaches to reducing EMI have aimed to reduce the switching frequency of switching circuits below the standard EMI bandwidth lim...

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): G05F1/46
CPCH02M1/12H02M1/44H02M3/155
Inventor M·特尔弗斯
Owner FLEXTRONICS AP LLC
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