Dead time optimization control device and method thereof

Abstract

The invention relates to a dead time optimization control device and a method thereof. The method comprises the following steps: outputting switching control signals for switching off a first power switching device connected with a voltage output end of a DC-DC converter according to a specified sequence to a first port connected with a first switching driver; in order to turn on the second powerswitching device in advance after outputting the switching control signal and before alternately switching the second power switching device, outputting first and second short pulses with different pulse widths at the same time through second and third ports connected with the second and third switching drivers respectively; and outputting a switching control signal for alternately switching the second power switching device to a fourth port connected with a fourth switching driver, thereby minimizing dead-time interval caused by alternately switching two power switching devices, gentling thefalling slope of voltage drop at the inverter output end by applying only one short pulse after the second power switching device reaches a threshold voltage, and minimizing switching noise.

Description

technical field [0001] The present invention relates to a direct current-direct current (DC-DC) converter, and more particularly to a control device and method for suppressing electromagnetic interference (EMI) noise and optimizing dead-time in a direct-direct current converter. Background technique [0002] The DC-DC converter includes: a voltage conversion part for generating an output voltage converted from an input voltage by switching a switching device; and a control part for controlling switching of the switching device to stabilize the output voltage of the voltage conversion part . A DC-DC converter of this structure is a structural element commonly used in portable electronic devices using a battery as a voltage source. [0003] DC-DC converters can be divided into synchronous and asynchronous. In order to improve efficiency, the asynchronous method using switches and diodes is being changed to the synchronous method using two switches. [0004] However, when des...

AI Technical Summary

Problems solved by technology

In order to reduce the dead time, it is necessary to increase the size of the switch driver, but in this case, hard-switching will occur, so that the occurrence of electromagnetic interference noise is relatively large, thereby affecting the external integrated circuit (IC) or the environment. make an impact

Therefore, in the case of using the proposed "adaptive dead time control method", it is impossible to get rid of the trade-off relationship between the dead time interval and the electromagnetic interference noise, so that the minimum dead time cannot be ensured interval

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