Switch type power supply control circuit
A switching power supply and control circuit technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve the problems of sub-harmonic oscillation of current mode structure, achieve stable sub-harmonic oscillation, reduce dependence, Excellent anti-noise performance
Pending Publication Date: 2022-07-22
上海芯导电子科技股份有限公司
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Problems solved by technology
[0009] The invention provides a switching power supply circuit to solve the problem of sub-harmonic oscillation of the traditional current mode structure
Method used
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[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0035]The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to Describe a particular order or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be pract...
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The invention provides a switch type power supply control circuit. The switch type power supply control circuit comprises a switch power supply, a PWM control module, a switch conduction control module and a digital module, wherein the switching power supply comprises a first switching branch and a second switching branch; the first end of the first switch branch is connected with an input voltage end, the second end is connected with a first reference node, and the control end is connected with the first end of the PWM control module; the first end of the second switch branch is connected with the first reference node, the second end is connected with the grounding end, and the control end is connected with the second end of the PWM control module; the input end of the PWM control module is used for receiving a PWM pulse signal, the first end of the PWM control module outputs a first driving signal, and the second end of the PWM control module outputs a second driving signal; the first end of the switch conduction control module is connected with the first reference node, and the second end is connected with the third end of the PWM control module. According to the switch type power supply control circuit provided by the invention, the working continuity of a loop is ensured, and subharmonic oscillation is effectively eliminated.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a switching power supply control circuit. Background technique [0002] DC-DC switching power supply has a variety of control modes. According to the sampling signal, it can be generally divided into voltage mode and current mode. The voltage mode performs negative feedback by sampling the output voltage, and the current mode performs negative feedback by sampling the input current and output voltage. Commonly used current mode architectures include: peak current mode (Peak-CurrentMode), average current mode (Average-CurrentMode) and hysteretic current mode (Hysteretic-CurrentMode); PWM), Pulse Frequency Modulation (PFM), Constant On Time (COT), Fixed Off Time (FOT), Hysteresis Control (Bang-Bang) and other modes. [0003] Among them, the COT mode has a fast response speed, but the maximum duty cycle is limited due to the fixed on-time. If the on-time (TON) of...
Claims
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Login to View More IPC IPC(8): H02M3/156H02M1/14
CPCH02M3/156H02M1/14
Inventor 符志岗欧新华袁琼朱同祥邱星福陈敏宁亚平
Owner 上海芯导电子科技股份有限公司