Adaptive slope compensation module and method

A slope compensation and adaptive technology, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of slow system response, excessive, sub-harmonic oscillation, etc.

Active Publication Date: 2011-11-09
LEADTREND TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, when the general slope compensation method changes the operating conditions of the input power or output voltage of the switching power supply, it is easy to produce insufficient or excessive slope compensation, which may cause sub-harmonic oscillation to still exist or system response slow down problem

Method used

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  • Adaptive slope compensation module and method
  • Adaptive slope compensation module and method

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Embodiment Construction

[0014] Please refer to figure 1 . figure 1 It is a schematic diagram illustrating the adaptive slope compensation module 100 of the present invention. The adaptive slope compensation module 100 is suitable for the switching mode power supply 200 . The switch mode power supply 200 operates in a continuous conduction mode. The adaptive slope compensation module 100 of the present invention is suitable for a buck power supply, a boost power supply or a buck-boost power supply. For the convenience of description, it is assumed that the switching power supply 200 is a step-up power supply as an example. The switching power supply 200 has a switch control circuit 210, a power switch Q PW , a diode D 1 , an inductor L and an inductor current detection circuit 220 . The inductor L is coupled to the input power supply V IN . The switch control circuit 210 controls the power switch Q PW Turn on or off, so that the inductor L can store or release energy to generate the output vo...

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PUM

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Abstract

The invention provides an adaptive slope compensation method which is applied to a switched power supply unit. The switched power supply unit is provided with a power switch and an inductor which is coupled with an input power supply; and the power switch controls the inductor to store energies or release the energies so as to generate an output voltage. The adaptive slope compensation method comprises the following steps: detecting an inductive current flowing through the inductor and converting the inductive current into an inductive current detection voltage; detecting the duty cycle of the power switch; detecting the voltage difference of the inductive current detection voltage when the power switch is started; using the voltage difference of the duty cycle and the inductive current detection voltage to generate slope compensation signals; and utilizing the slope compensation signals to adjust the starting or the closing of the power switch. Therefore, although operation conditions of the input power supply or the output voltage are changed, the system can still respond quickly and does not generate sub-harmonic oscillation.

Description

technical field [0001] The present invention relates to an adaptive slope compensation module and its method, more specifically, relates to an adaptive slope compensation module suitable for a switching power supply and its method. Background technique [0002] Generally speaking, when the duty cycle (Duty cycle) of the power switch in the switching power supply exceeds 0.5, sub-harmonic oscillation (sub-harmonic oscillation) may occur, that is, the switching power supply may change at the switching frequency. Half the frequency starts to oscillate. A common way to solve this problem is to use a slope-compensation mechanism. However, when the general slope compensation method changes the operating conditions of the input power or output voltage of the switching power supply, it is easy to produce insufficient or excessive slope compensation, which may cause sub-harmonic oscillation to still exist or system response The problem of slowing down. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 赵兴国朱益杉
Owner LEADTREND TECH
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