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A frequency control circuit and its control method and switching converter

A technology of frequency control and converter, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, output power conversion device, etc., can solve the problem of chip cost increase

Active Publication Date: 2020-10-09
西安矽力杰半导体技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is often used in high-frequency switching power supplies, and its switching frequency is often above several hundred kilohertz; when this control method is applied to low frequencies, it is often necessary to integrate a low-pass filter, which means that it will cause Chip costs increase

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  • A frequency control circuit and its control method and switching converter
  • A frequency control circuit and its control method and switching converter
  • A frequency control circuit and its control method and switching converter

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Embodiment Construction

[0052] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0053] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0054] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a frequency control circuit, its control method and a switch-type converter, which are used in a switch-type converter, and are characterized in that they are used for adjusting The turn-off time of the power transistor in the working cycle; or, adjust the turn-on time of the power transistor in the working cycle according to the turn-off time of the power transistor, so that the switch-mode converter The operating frequency is maintained within a preset range, and no slope compensation is required in an application environment with a high duty cycle, which reduces the cost of solution design.

Description

technical field [0001] The present invention relates to the technical field of switching power supplies, and more specifically, relates to a frequency control circuit, a control method thereof, and a switching converter. Background technique [0002] In the prior art, among the schemes that require a constant switching frequency for switching power supplies, the more common control methods are: [0003] 1. Adopt constant frequency pulse width modulation. This method is relatively common and simple in circuit design, but the disadvantage is that when it works in continuous conduction mode (Continuous Conduction Mode, CCM), when the duty cycle is greater than 50%, there will be sub-harmonic oscillation problems, usually need to increase slope compensation to solve this problem. [0004] 2. Adopt constant on / off time control method. This method is often used in high-frequency switching power supplies, and its switching frequency is often above several hundred kilohertz; when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/2173H02M3/156H02M1/08H02M3/1582H02M3/157H02M1/0003H02M1/0012H02M3/1566
Inventor 陈浩李乐李新磊
Owner 西安矽力杰半导体技术有限公司