Predictive dead time generating circuit

Abstract

The invention discloses a predictive dead time generating circuit, and belongs to the technical field of electronic circuits. A dead time detection module is used for detecting the dead time between the power-off of an upper power tube and the power-on of a lower power tube as well as the dead time between the power-off of the lower power tube and the power-on of the upper power tube. A first detection signal and a second detection signal are generated according to whether the detected dead time reaches an optimal value or not, and a logical control module is used for changing the output of adelay module according to the judgement result of the dead time detection module in order to change the dead time between an upper power tube driving signal and a lower power tube driving signal. Through adoption of the predictive dead time generating circuit, the dead time can be adjusted to ensure the dead time margin and optimize the length of the dead time, so that the power consumption is lowered.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a predictive dead zone time generating circuit, which can be used for a DC-DC control converter. Background technique [0002] As the battery volume of electronic devices becomes smaller and the voltage becomes lower and lower, the requirements for the working efficiency of switching power supplies are getting higher and higher. Various techniques are used in switching power supply technology to improve efficiency. Among them, the synchronous rectification technology does not use the traditional diode rectification, but the MOSFET tube with low conduction voltage drop for rectification, thereby reducing the conduction loss of the switching power supply system and improving the conversion efficiency of the switching power supply system. Since the MOSFET tube does not have the unidirectional conduction characteristics of the diode, it is necessary to add a ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of power consumption caused by the fact that the dead time in the traditional fixed dead time generation circuit cannot reach the optimal value, the present invention proposes a predictive dead time generation circuit, which optimizes the dead time margin while ensuring the dead time margin. length of dead time, thereby reducing power consumption

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