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Device with overcurrent protection and overcurrent protection method

An over-current protection and over-current detection 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 problem of inaccurate peak current of inductor current, etc., and achieve the effect of accurate limitation

Active Publication Date: 2020-12-25
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present application provides an overcurrent protection device and an overcurrent protection method to solve the problem of inaccurate peak current of the existing inductor current

Method used

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  • Device with overcurrent protection and overcurrent protection method
  • Device with overcurrent protection and overcurrent protection method
  • Device with overcurrent protection and overcurrent protection method

Examples

Experimental program
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Embodiment Construction

[0039] As mentioned in the background technology, the peak current of the inductor current of the DC-DC converter in the prior art is not accurate enough. For specific analysis, please refer to figure 1 , figure 1 It is a schematic diagram of the signal corresponding to the voltage of the inductor current for slope compensation.

[0040] The overcurrent protection adopts a fixed reference voltage VREF, and the slope compensation applies a compensation signal with a slope of ma to the voltage corresponding to the inductor current. When the duty cycle of the inductor current is 25%, the compensation amount is added to the peak voltage signal corresponding to the peak value of the inductor current V11, when the duty cycle of the inductor current is 50%, the amount of compensation added to the peak voltage signal corresponding to the current peak value is V12, V12>V11, when VREF remains unchanged, the actual duty cycle is 50%. Peak V P less than the actual peak V at a duty cycle...

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PUM

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Abstract

The invention discloses a device with overcurrent protection and an overcurrent protection method, and the device comprises: a DCDC conversion circuit which is used for the conversion of a DC voltageand comprises an inductor; and an overcurrent detection circuit which comprises a sampling module which is coupled to the DCDC conversion circuit and is used for sampling inductive current in the DCDCconversion circuit and generating first voltage according to the inductive current, a reference module which is used for generating a periodically changing second voltage, the second voltage in eachperiod being gradually increased on the basis of a reference voltage, and a comparator which is provided with a first input end and a second input end which are respectively coupled to the output endsof the input module and the reference module and used for comparing the first voltage with the second voltage so as to generate an overcurrent detection signal. The device can maintain the stabilityof the peak current of the inductive current.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, in particular to an overcurrent protection device and an overcurrent protection method. Background technique [0002] A DC-DC converter is capable of changing an uncontrolled input DC voltage into another controlled output DC voltage. The DC-DC converter using current-controlled pulse width modulation (PWM) is a commonly used converter. By adjusting the pulse width, the output voltage is adjusted, and the rectified voltage output is generated efficiently using devices without energy consumption, including power switches. , diode switches, inductors and capacitors and other devices. [0003] In the prior art, a fixed inductor current peak current threshold is usually used to limit the inductor current of the PWM-controlled DC-DC converter in the current control mode, so as to avoid excessive heat generation or inductance of the chip due to excessive current. Saturation redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M3/158H02M3/157H02M1/088
CPCH02M1/32H02M3/158H02M3/157H02M1/088H02M1/0029H02M1/0038H02M1/0009
Inventor 严之嶽袁政
Owner SHANGHAI AWINIC TECH CO LTD
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