Unlock instant, AI-driven research and patent intelligence for your innovation.

Constant on time control method and control circuit and switch circuit

A time control circuit and on-time technology, applied in the field of power electronics, can solve problems such as poor THD, and achieve the effect of improved THD and good transient response

Pending Publication Date: 2019-06-21
JOULWATT TECH INC LTD
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a constant on-time control method, a control circuit and a switch circuit to solve the problem of poor THD of a circuit with power factor correction in the prior art when high voltage is input

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
  • Constant on time control method and control circuit and switch circuit
  • Constant on time control method and control circuit and switch circuit
  • Constant on time control method and control circuit and switch circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0027] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0028] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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 constant on time control method and control circuit and a switch circuit. An interval in which a compensation voltage is greater than a first voltage is a second interval. The interval in which the compensation voltage is smaller than the first voltage is a first interval. In the first interval, a slope that a master switch tube on time is increased as the compensation voltage is boosted is a first slope. In the second interval, the slope that the master switch tube on time is increased as the compensation voltage is boosted is a second slope. The second slope is greater than the first slope. The compensation voltage is a voltage obtained by carrying out operational amplification on a feedback value and a reference voltage. According to the control method, the control circuit and the switch circuit, when high voltage input is carried out, THD of the circuit with power factor calibration is improved, and when low voltage input is carried out, transient responseis good.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a constant on-time control method, a control circuit and a switch circuit. Background technique [0002] Switching converter circuits have been widely used in the field of power conversion due to their high efficiency and easy control. In AC-DC conversion, in order to prevent the input current of the converter from polluting the power grid, the converter is usually required to meet the power factor and harmonic requirements specified by the industry or each country / region. [0003] Among various control methods of switching converter circuits, constant on time (COT) control is widely used due to its advantages of fast transient response and simple structure. [0004] In constant on-time control, the on-time is controlled by the compensation voltage COMP. In the traditional scheme, the conduction time increases with the increase of the compensation voltage, and the slo...

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): H02M1/08H02M1/42
CPCY02B70/10
Inventor 查振旭黄必亮周逊伟
Owner JOULWATT TECH INC LTD