Load state detection circuit and method

Abstract

The embodiment of the invention relates to the field of circuit technology, and discloses a load state detection circuit and method. In the detection circuit, the microcontroller is connected to the switch unit, and the switch unit is connected between the detection power supply and the load to be tested; a voltage sampling point is formed at any end of the load to be measured, and the voltage sampling circuit is connected between the voltage sampling point and the microcontroller. The voltage sampling circuit is used to collect the voltage at the voltage sampling point; the microcontroller is used to control the switch unit to connect the load under test and the detection power supply before turning on the load under test and the driving power supply, and sample the voltage according to the received voltage The voltage at the voltage sampling point collected by the circuit judges whether there is a fault in the load to be tested; when the microcontroller determines that there is no fault in the load to be tested, it disconnects the load to be tested and the detection power supply by controlling the switch unit, and controls the load to be tested and the drive Power on. In the present invention, before the load to be tested is powered on, it can be judged in advance whether there is a fault in the load to be tested.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit technology, and in particular to a load state detection circuit and method. Background technique [0002] With the development of battery technology, the replacement of fuel vehicles by electric vehicles has become the development trend of the automotive industry. Some high-power switching devices are used in electric vehicles, such as relays, contactors, and some loads. These devices are very important for the safe operation of the vehicle. Due to the complex driving environment and the life of the load itself, these devices may fail, posing a greater safety hazard. [0003] The inventors have found that there are at least the following problems in the prior art: at present, after the high-power switching device is powered on, its drive circuit has corresponding protection functions, such as over-temperature protection and over-current protection; however, these protection measur...

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Problems solved by technology

Due to the complex driving environment and the life of the load itself, these devices may fail, posing a greater safety hazard

[0003] The inventors have found that there are at least the following problems in the prior art: at present, after the high-power switching device is powered on, its drive circuit has corresponding protection functions, such as over-temperature protection and over-current protection; however, these protection measures are passive Protection measures, and must be protected passively after power-on

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