Half-bridge driving circuit and system

Abstract

The invention relates to a half-bridge driving circuit and system which are used for driving a first power tube and a second power tube which are connected in series. The half-bridge driving circuit further comprises a signal generating unit used for generating an input signal, wherein the pulse width of the input signal is larger than or equal to the preset pulse width; and a driving unit which receives a first monitoring signal, a second monitoring signal and an input signal, is configured to output a first driving signal according to the input signal and the first monitoring signal and output a second driving signal according to the input signal and the second monitoring signal, and is used for controlling the first power tube and the second power tube not to be conducted at the same time, wherein a first time delay exists between the first monitoring signal and the input signal, a second time delay exists between the second monitoring signal and the input signal, and the preset pulse width is larger than or equal to the larger one of the first time delay and the second time delay. According to the invention, direct connection explosion of the half-bridge driving circuit caused by circuit delay can be effectively prevented.

Description

technical field [0001] The invention mainly relates to the technical field of electronic circuits, in particular to a half-bridge drive circuit and system. Background technique [0002] In the field of analog devices and power devices, applications such as DCDC and motor drives will involve the application of half-bridge drive circuits. figure 1 It is a schematic diagram of the structure of a half-bridge drive circuit. refer to figure 1 As shown, a half-bridge circuit usually consists of two semiconductor field-effect transistors (MOSFETs) or insulated-gate bipolar transistors (IGBTs), such as figure 1 The upper tube M1 and the lower tube M2 in the. The drain (or collector) of the upper tube M1 is connected to the power supply Vbus, the source (or emitter) is connected to the drain (or collector) of the lower tube M2, and the source (or emitter) of the lower tube M2 is connected to The ground wire GND is connected. Usually, in order to control the turn-on or turn-off of...

AI Technical Summary

Problems solved by technology

However, during the dead time, both the upper tube and the lower tube are turned off, which will cause an increase in circuit loss, resulting in a decrease in efficiency

Moreover, when the pulse width of the input signal is narrow, due to the delay in the signal transmission process, it will not be able to correctly monitor the gate off signal, resulting in the occurrence of a direct explosion

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