H-bridge drive circuit and electrical system that can realize over-temperature protection

Abstract

The invention provides an H-bridge drive circuit capable of realizing over-temperature protection and an electrical system. The output end of a voltage stabilization output circuit is electrically connected with the first voltage input end of a first driving chip and the first voltage input end of a second driving chip; a temperature sensor of a temperature detection circuit is arranged on a heating part of a controlled electric appliance, and the temperature detection circuit is electrically connected with the voltage stabilization output circuit; a control signal adjusting circuit is electrically connected with signals of the first driving chip and the second driving chip respectively; the signal output ends of the first driving chip and the second driving chip are electrically connectedwith an upper bridge arm and a lower bridge arm of the H-bridge circuit respectively; the output end of the upper bridge arm and the output end of the lower bridge arm are used for supplying power tocontrolled electric appliance. According to the H-bridge drive circuit capable of realizing over-temperature protection, the limitation of an existing bootstrap circuit on the on and off of a switching device can be effectively avoided; the problem that a drive chip algorithm is too complex due to the fact that a temperature detection module is additionally arranged can be avoided; and at least two actual requirements are considered.

Description

technical field [0001] The present application relates to the technical field of H-bridge driving circuits, in particular, the present application relates to an H-bridge driving circuit and an electrical system capable of realizing over-temperature protection. Background technique [0002] In the existing H-bridge driving circuit, the driving voltage of the switching device in the H-bridge circuit is provided by a bootstrap circuit composed of a driving chip, a diode and a capacitor. The first end of the diode in the bootstrap circuit is electrically connected to the preset voltage end, the first end of the diode and the first end of the capacitor are both electrically connected to the voltage input end of the driver chip, and the first end of the capacitor is connected to two switches The series nodes of the devices are electrically connected. When the bootstrap circuit of the above form provides the driving voltage to the switching device, it is necessary to set the charg...

AI Technical Summary

Problems solved by technology

However, adding a temperature detection module to the original H-bridge drive circuit requires major changes to the H-bridge drive circuit, which will also increase the complexity of the algorithm of the drive chip itself

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