Soft start device for DC-DC converter

A DC converter and soft-start technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of inductor degradation, excessive response of output voltage, etc., and achieve the effect of preventing degradation

Pending Publication Date: 2020-09-29
SHENZHEN CHALLWOON SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As described above, if a negative inductor current with a large value is generated in a short period of time, there is a problem of causing deterioration of the inductor and excessive response of the output voltage

Method used

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  • Soft start device for DC-DC converter
  • Soft start device for DC-DC converter
  • Soft start device for DC-DC converter

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Embodiment Construction

[0032] Hereinafter, referring to the accompanying drawings, the soft start device for a DC-DC converter according to a preferred embodiment of the present invention will be described in detail.

[0033] image 3 It is a figure for demonstrating the soft starter for DC-DC converters of this invention.

[0034] exist image 3 , the first power transistor P1 and the second power transistor N1 are connected in parallel with the inductor L of the DC-DC converter.

[0035] The first power transistor P1 can be realized as a PMOS transistor, and the second power transistor N1 can be realized as an NMOS transistor.

[0036] The soft start circuit unit 10 generates and outputs a soft start signal SOFT_START according to the enable signal of the DC-DC converter and the clock signal CLK.

[0037] The negative inductor current detection part 20 detects the negative inductor current according to the voltage difference between the two ends of the first power transistor P1.

[0038] When ...

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PUM

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Abstract

The invention relates to a soft start device for a DC-DC converter. The soft start device comprises a first power transistor and a second power transistor which are connected in parallel with an inductor of the DC-DC converter; a negative inductor current detection unit which detects a negative inductor current on the basis of a voltage difference between both ends of the first power transistor; asoft start circuit unit that generates a soft start signal on the basis of the enable signal of the DC-DC converter; a negative inductor current control signal generation unit that generates a negative inductor current control signal, which controls the negative current level flowing through the inductor on the basis of the output signal of the negative inductor current detection unit and the output signal of the soft start circuit unit; and a pulse width modulation controller that alternately turns on/off the two power transistors according to a signal applied from the voltage comparator andturns off the first power transistor during application of the negative inductor current control signal. By controlling the peak level of the negative inductor current in the soft start section, deterioration of the inductor and excessive response of the output voltage can be prevented.

Description

technical field [0001] The present invention relates to a soft start device for a direct current-direct current (DC-DC) converter, and more particularly, to a soft start device for a direct current-direct current converter, that is, when a power supply unit is enabled in a low power consumption (DLP) mode , when the current output voltage is higher than the target output voltage, the negative peak level of the inductor current can be controlled in the soft-start interval. Background technique [0002] Terminals such as smart phones and tablet computers are provided with display panels. [0003] The display panel can be driven by receiving different driving voltages according to the type of image displayed on the screen or display mode (eg, common mode, clock mode). [0004] figure 1 It is a diagram exemplarily showing a display panel realized to receive and drive different driving voltages depending on the type of video or display mode. [0005] Such as figure 1 As shown...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 梁大成金容佑
Owner SHENZHEN CHALLWOON SEMICON CO LTD
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