Method for eliminating sub-harmonic oscillation of switching power supply

A sub-harmonic oscillation and switching elimination technology, applied in the field of switching power converters, can solve the problems of high circuit cost, inability to reduce device size, and difficulty in implementation

Active Publication Date: 2017-05-24
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

However, the implementation of slope compensation is more difficult. Its digital implementation requires a high-speed DAC to generate the slope, ...

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  • Method for eliminating sub-harmonic oscillation of switching power supply
  • Method for eliminating sub-harmonic oscillation of switching power supply
  • Method for eliminating sub-harmonic oscillation of switching power supply

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Embodiment Construction

[0094] see Figure 1a , is a block diagram of the overall system structure of the sub-harmonic elimination used in the patent of the present invention. The structure of the control system includes sampling module, error calculation module, PID module and pulse modulation module (PWM or PFM). The control system is connected with the controlled switching power supply to form a closed loop.

[0095] The sampling module includes a sampling circuit and a sampling calculation module. The sampling circuit obtains the information of the output voltage by sampling the voltage division of the output voltage of the switching power supply as the input of the sampling calculation module. The sampling calculation module calculates the sampling result of the output voltage division according to the sampling circuit. , get the signal Vo of the output voltage.

[0096] The input of the error calculation module is the output Vo of the sampling module. According to the calculation reference volt...

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Abstract

The invention relates to a method for eliminating the sub-harmonic oscillation of a switching power supply. The method is based on a control system comprising a sampling module, an error calculation module, a proportion integration differentiation (PID) module and a pulse modulation module; the control system is connected with the controlled switching power supply, so that a closed loop is formed. The sampling module is used for sampling the output voltage of the switching power supply and calculating so as to obtain Vo; the error calculation module subtracts the Vo from a reference voltage Vref so as to obtain current sampling error e1; the PID module performs PID operation according to the error e1 and PI parameter values so as to obtain a compensation result VPI, and outputs same to the pulse modulation module; the pulse modulation module outputs duty for controlling the switching power supply. According to the method, a time length calculation module and a sub-harmonic cancellation module are additionally arranged, the time length calculation module is used for calculating different switching time lengths, the sub-harmonic cancellation module can be further used for determining a compensation function and calculating the compensation quantity of control current, and the sub-harmonic oscillation can be eliminated by compensating the control current.

Description

technical field [0001] The invention relates to a switching power supply converter. Subharmonic oscillation may occur after the switching power supply is introduced into a current control method. The invention provides a method for eliminating the subharmonic oscillation of the switching power supply. Background technique [0002] Switching power supplies are usually used as power supplies for various types of electrical equipment to convert unadjusted AC or DC input voltages into adjusted AC or DC output voltages. In switching current control systems, control methods such as peak current control and average current control are often used. Since the switching power supply needs to adapt to different working conditions, the anti-interference ability is very important. After introducing these control methods, there may be sub-harmonic oscillations caused by disturbances. This subharmonic oscillation is due to the initial disturbance of the inductor current (which can be expre...

Claims

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Application Information

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IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 徐申陈威宇沈为冬王冲孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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