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

A light-load and high-efficiency realization circuit of a dc-dc converter

A DC-DC and converter technology, applied in the field of DC-DC converters, can solve the problems of dead time loss, control circuit loss, external component loss, etc., and achieve the effects of improving efficiency, reducing internal consumption, and high precision

Active Publication Date: 2017-04-05
南京国博电子股份有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although this typical buck type DC-DC converter has a simple working principle, few components and low cost, there are also certain problems in this circuit, which are mainly reflected in the fact that a certain loss will be generated in the circuit at this time, mainly including the control circuit part. Loss, Q1, Q2 conduction loss, switching loss, drive Q1, Q2 loss, dead time loss, external component loss, etc.

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
  • A light-load and high-efficiency realization circuit of a dc-dc converter
  • A light-load and high-efficiency realization circuit of a dc-dc converter
  • A light-load and high-efficiency realization circuit of a dc-dc converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0017] The core link of the present invention is described here. In a common DC-DC converter, the switch tube is Q1, and its on-resistance is R Q1 . Then the loss when Q1 is turned on can be expressed as:

[0018] P COND_D1 = I OUT 2 *R Q1 *D (1)

[0019] where I OUT refers to the output load current, R Q1 Refers to the on-resistance of the upper tube Q1, and D is the duty cycle.

[0020] The losses driving Q1 (that is, switching losses) can be expressed as:

[0021] P SWITCH =Q G *V IN *F SW =C GS1 *V GS *V IN *F SW (2)

[0022] Among them, CGS1 is the parasitic gate-source capacitance of Q1, VGS is the gate-source voltage when the switch tube is working, FSW is the switching frequency of the switch tube, and VIN is the power supply voltage.

[0023] The loss of the internal circuit P IN Consumption of fixed bias and c...

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 a light-load and high-efficiency realization circuit of a DC-DC converter, which includes a counter, a flip-flop, a clock generation circuit, a delay unit, switch control logic, an inverter and a NAND gate. The present invention judges the light-load mode through a built-in counter, and the count value can be adjusted to make the accuracy higher in practical application. After entering the light load, the existence of the delay unit reduces the switching frequency of the switch tube, and the light load logic signal turns off the clock generation circuit at the same time to reduce the internal consumption, thereby improving the light load efficiency of the DC-DC converter, and the normal working state No effect. The invention can be applied to three light-load control modes of a BUCK type DC-DC converter, has simple structure, reduces use cost, and is safe and reliable.

Description

technical field [0001] The invention relates to a circuit applied to a DC-DC converter, which improves the efficiency of the DC-DC converter by increasing the conduction time of a switch tube at light load, and belongs to the technical field of DC-DC converters. Background technique [0002] In the increasingly popular portable electronic products, most of them are powered by batteries. The limited battery capacity and the rapid expansion of product functions put forward higher and higher requirements for the efficiency of power management. The integrated BUCK DC-DC converter is used in a wide range of The high efficiency can be maintained in the input and output voltage range, making it the preferred power management device in many occasions. [0003] Buck DC-DC converters have three control modes at light load, which can be simply divided into forced continuous mode, pulse skipping mode, and burst mode. Forced continuous mode, where current flows in both directions, has t...

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): H02M3/155
CPCH02M3/1584H02M1/0048H02M3/1586Y02B70/10
Inventor 朱波施家鹏范建林陈雁
Owner 南京国博电子股份有限公司
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