H-bridge drive circuit with over-temperature protection function and electrical system

Abstract

The invention provides an H-bridge drive circuit with an over-temperature protection function and an electrical system. A temperature detection circuit is provided with a temperature sensor, and the temperature sensor is arranged on a heating part of a controlled electric appliance; the output end of the temperature detection circuit is electrically connected with one signal input end of a controlsignal adjusting circuit; the signal output end of the control signal adjusting circuit is electrically connected with the signal input end of a first driving chip and the signal input end of a second driving chip. The signal output end of the first driving chip and the signal output end of the second driving chip are electrically connected with 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 electrically connected with the controlled electric appliance; and a voltage stabilization output circuit is electrically connected with the first driving chip and the second driving chip. According to the H-bridge drive circuit, limitation of an existing bootstrap circuit on ON / OFFof a switching device can be effectively avoided, and the problem that a drive chip algorithm is too complex due to additional arrangement of the temperature detection module can also be avoided.

Description

technical field [0001] The present application relates to the technical field of H-bridge drive circuits, and in particular, the present application relates to an H-bridge drive circuit with an over-temperature protection function and an electrical system. 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 charging ...

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.

Images