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Circuit and method for realizing fast and high-precision adaptive slope compensation

A slope compensation and high-precision technology, which is applied in the direction of electrical components, electric variable adjustment, output power conversion devices, etc., can solve the problem of unsuitable wide input voltage and wide load change application environment, system load capacity reduction, and reduced compensation speed, etc. problem, to achieve the effect of speeding up the adaptive process, reducing the output voltage overshoot, and improving speed and accuracy

Active Publication Date: 2019-11-05
FUJIAN JIANGXIA UNIV
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AI Technical Summary

Problems solved by technology

[0014] The fixed slope compensation of the existing technology is easy to cause overcompensation, resulting in a decrease in the load capacity of the system, and is not suitable for application environments with wide input voltage and wide load changes
Moreover, most of the existing self-adaptive compensation adopts the discrete type, that is, the ramp signal and the current sampling signal are superimposed through the same-phase proportional amplifier or V / I conversion respectively, which reduces the compensation speed and the circuit is susceptible to temperature and process parameters. , the compensation accuracy is not high

Method used

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  • Circuit and method for realizing fast and high-precision adaptive slope compensation
  • Circuit and method for realizing fast and high-precision adaptive slope compensation
  • Circuit and method for realizing fast and high-precision adaptive slope compensation

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Embodiment Construction

[0032] In order to make the features and advantages of this patent more obvious and easy to understand, the following special examples are described in detail as follows:

[0033] Such as Figure 4 As shown, the circuit for implementing fast and high-precision adaptive slope compensation provided by this embodiment includes: a slope generation and summation circuit, a pulse generation circuit, a dynamic bias parallel negative feedback circuit and a voltage divider circuit.

[0034] Among them, the slope generation and summation circuit is used to generate a slope compensation voltage that follows the change of the duty cycle; the pulse generation circuit is used to generate a narrow pulse that controls the charging and discharging of the capacitor by the slope current to generate a slope voltage; the dynamic bias parallel negative feedback circuit Used to improve the speed and accuracy of adaptive slope compensation; the voltage divider circuit is used to generate a voltage pr...

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Abstract

The invention provides a rapid high-precision circuit and method realizing adaptive slope compensation. A slope generation and summation circuit, a pulse generation circuit, a dynamic bias parallel negative feedback circuit and a bleeder circuit are included; the slope generation and summation circuit generates a slope compensation voltage changing with a duty ratio; the pulse generation circuit generates narrow pulses through which charging / discharging of a capacitor is controlled via the slope current and a slope voltage is generated; the dynamic bias parallel negative feedback circuit is used to improve the speed and precision of adaptive slope compensation; and the bleeder circuit is used to generate a voltage in certain proportion to the input voltage. The adaptive slope compensationcircuit avoids harmonic oscillation caused by under-compensation and decrease of the on-load capability caused by over-compensation, the dynamic bias parallel negative feedback circuit is introduced to acceleration an adaption process, and the speed and precision of slope compensation are improved.

Description

technical field [0001] The invention belongs to the field of switching power supplies of integrated circuits, and in particular relates to a circuit and method for realizing fast and high-precision self-adaptive slope compensation based on a peak current mode step-down DC-DC converter. Background technique [0002] With the development of semiconductor technology and electronic technology, the functionalization and rapidity of portable electronic products have increased their requirements for battery life, and at the same time require the power supply to be able to output efficiently and stably under wide input and wide load changes. Under this demand, switching power supplies using synchronous rectification technology and high frequency control are widely used, especially peak current mode DC-DC converters with fast transient response, high conversion efficiency and wide load operation. However, when the duty cycle is greater than 50%, the peak current mode DC-DC converter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/158
Inventor 黄淑燕陈冬英关翔峰张禹张丽丽严琼林灵燕
Owner FUJIAN JIANGXIA UNIV
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