System for linearly adjusting slope compensation voltage slope

A technology of slope compensation and linear regulation, applied in control/regulation systems, regulating electrical variables, output power conversion devices, etc. Adjustment ability and other issues, to achieve the effect of good load capacity and load adjustment ability

Active Publication Date: 2010-08-04
NINGBO SEMICON INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slope of the traditional slope compensation voltage is a fixed value, which is prone to over-compensation and under-compensation. If the slope of the slope compensation voltage is too large, over-compensation will easily occur at a large duty cycle, which ...

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  • System for linearly adjusting slope compensation voltage slope
  • System for linearly adjusting slope compensation voltage slope
  • System for linearly adjusting slope compensation voltage slope

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] As shown in the figure, a system for linearly adjusting the slope of the slope compensation voltage includes a duty cycle detection circuit 1, a voltage-current conversion circuit 2, a slope generation circuit 3, and a reference current source IB. The duty cycle detection circuit 1 converts the input switch The signal V1 is converted into a voltage signal Vc linearly related to the switch signal V1, and the voltage signal Vc is transmitted to the voltage-current conversion circuit 2, and the voltage-current conversion circuit 2 linearly converts the voltage signal Vc into a first current signal Ic and outputs it, The first current signal Ic is superimposed with the reference current source IB to form the second current signal Ic2 input to the slope generating circuit 3, and the slope generating circuit 3 charges it with the second curren...

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Abstract

The invention discloses a system for linearly adjusting the slope compensation voltage slope. With a duty factor detection circuit, a voltage and current conversion circuit and a slope generation circuit, a duty factor of a switch signal in a peak current control mode chip is converted into a voltage signal forming a linear relationship with the duty factor by using the duty factor detection circuit, the voltage signal is linearly converted into a first current signal by using the voltage and current conversion circuit, and a second current signal formed by superposing the first current signal and a reference current source passes through the slope generation circuit to obtain slope compensation voltage, so that the invention achieves the function of linearly adjusting the slope of the slope compensation voltage according to the duty factor of the switch signal in the peak current control mode chip, well solves the problems that the peak current control mode chip is easy to generate over compensation during low duty factor and generate under compensation during high duty factor and ensures that the chip has favorable loading capacity and load regulating capacity in the work range of all duty factors.

Description

technical field [0001] The invention relates to a slope compensation technology in a peak current control mode chip, in particular to a system for linearly adjusting the slope of the slope compensation voltage. Background technique [0002] Peak current control mode (PCM, Peak Current Model) is one of the most widely used control methods in the field of switching power supplies. Its main advantages are as follows: (1) Since the output load current is proportional to the inductor current, PCM realizes the control within each switching cycle output current, so that it has more superior load adjustment characteristics and anti-input power disturbance ability; (2) It has an instantaneous peak current current limiting function, which will not damage the switch tube due to overcurrent, and greatly reduces the protection of overload and short circuit; ( 3) The entire feedback circuit becomes a first-order circuit, so the control loop compensation network of the error amplifier is s...

Claims

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Application Information

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IPC IPC(8): H02M3/158
Inventor 曾强
Owner NINGBO SEMICON INT CORP
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