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An active clamping slope restoring circuit

A technology of clamping circuit and slope recovery, applied in electrical components, adjusting electrical variables, instruments, etc., can solve problems such as low average inductor current, decreased system load capacity, and reduced chip load capacity

Inactive Publication Date: 2018-02-02
刘阳
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The slope compensation circuit reduces the magnitude of the peak current, resulting in a low average inductor current, which reduces the maximum load current and causes the problem that the load capacity of the system decreases with the increase of the duty cycle.
[0005] (2) Adding a slope compensation circuit may overcompensate the phenomenon, so that the current loop becomes a voltage loop
[0006] (3) The slope compensation circuit slows down the transient response of the system
[0009] However, for the BUCK chip using the peak current mode, since the slope compensation current is introduced when the duty cycle is greater than 50%, the peak inductor current will decrease due to the addition of the slope compensation current when the clamp value remains unchanged, resulting in a maximum The load current decreases with the increase of the duty cycle, that is, the load capacity of the chip decreases with the increase of the duty cycle

Method used

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  • An active clamping slope restoring circuit
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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0023] Such as figure 1 As shown, the slope compensation circuit is used in a typical peak current mode Buck topology switching power supply. At the beginning of each cycle, the clock signal sets the output of the latch to high. When the output of the latch is high, the switch tube M3 is turned on. , the rectifier tube D1 is reverse biased and non-conductive, the current is transmitted from the input terminal VIN to the output terminal Vout through the inductor, the inductor current gradually increases with a constant slope, the current converted from the error amplifier output voltage ITH is the same as that generated by the slope compensation circuit The slope current is used as a difference, and the signal VC after slope compensation is obtained and sent to the PWM comparator terminal, which is compared with the sampling signal of the inductor current...

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Abstract

The invention belongs to the technical field of analog integrated circuits, and relates to a slope recovery circuit based on dynamic clamping technology. The circuit can dynamically raise the clamping voltage of the error amplifier according to the magnitude of the slope compensation current, so that switching power maintain a constant load capacity.

Description

technical field [0001] The invention belongs to the field of switching power supplies of analog integrated circuit technology, and relates to a slope recovery circuit based on dynamic clamping technology. Maintain a constant load capacity than the following. Background technique [0002] Common control modes for switching power supplies include voltage mode and current mode. Voltage mode is not commonly used due to slow dynamic response and complex compensation network. The current mode is favored for its fast dynamic response, instantaneous peak current limiting function, and simple compensation network. Current mode is divided into average current mode and peak current mode. Because the circuit structure of the peak current mode is simpler than that of the average current mode, the peak current mode is often used. [0003] When the peak current mode is used, sub-harmonic oscillation may occur when the duty cycle is greater than 50%. In order to ensure the loop stabilit...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/158
Inventor 刘阳
Owner 刘阳