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An open-circuit detection circuit for h-bridge drive output

A drive output and open-circuit detection technology, which is applied in electronic circuit testing, analog circuit testing, etc., can solve the problem that the H-bridge drive output module cannot perform open-circuit detection, etc.

Active Publication Date: 2022-05-03
深蓝汽车科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide an open-circuit detection circuit of an H-bridge drive output module, which is used to solve the technical problem that the H-bridge drive output module cannot perform open-circuit detection

Method used

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  • An open-circuit detection circuit for h-bridge drive output

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Embodiment Construction

[0023] Such as figure 1 As shown, an open-circuit detection circuit of an H-bridge drive output module includes a battery, an H-bridge drive output module, and a load M. The battery uses a 12V lead-acid battery to supply power for the H-bridge drive output module. The load M is an inductive load, the H-bridge drive output module includes a left half-bridge MOS tube and a right half-bridge MOS tube connected in parallel with the left half-bridge MOS tube, and the left half-bridge MOS tube includes an upper bridge MOS tube of the left half-bridge and a left-half bridge MOS tube The upper bridge MOS tube of the bridge is connected in series with the lower bridge MOS tube of the left half bridge. Bridge MOS tube. In this embodiment, the H bridge drive output module is composed of the upper bridge MOS tube of the left half bridge, the lower bridge MOS tube of the left half bridge, the upper bridge MOS tube of the right half bridge and the lower bridge MOS tube of the right half br...

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Abstract

The invention provides an open-circuit detection circuit of an H-bridge drive output module, and relates to the technical field of an intelligent vehicle domain controller of a new energy vehicle vehicle control system. When the control circuit controls a plurality of MOS tubes of the H-bridge drive output module to maintain When the power supply voltage flows through the first resistor R1 and P-MOS Q21 and is then transmitted to the load, but the P-MOS Q21 is closed, the acquisition circuit respectively collects the voltage divided by the fourth resistor and the fifth resistor. and collect the voltage value U1 after being divided by the second resistor and the third resistor, and send the collected U1 and U2 to the diagnostic circuit for difference. The invention can judge whether the drive output of the H bridge is in the open circuit state or not, and solves the technical problem that the drive output module of the H bridge cannot perform open circuit detection. The open circuit detection of the H-bridge drive output module is realized when multiple MOS tubes are not powered on by the H-bridge drive output module.

Description

technical field [0001] The invention relates to the technical field of an intelligent vehicle domain controller of a new energy vehicle vehicle control system, in particular to an open-circuit detection circuit of an H-bridge drive output module. Background technique [0002] With the increasing intelligence of new energy vehicles, there are more and more application scenarios driven by small motors, so more and more H-bridge driver chips are used, but the H-bridge driver cannot perform open-circuit diagnosis, resulting in the inability to understand the output The connection state of the object, so there is a certain security risk in the use of the whole vehicle. [0003] As disclosed in the Chinese patent document CN206804780U, "a circuit for motor open circuit diagnosis" includes an H bridge drive output module, a diagnostic circuit and an MCU. The anode of the drive output module is connected to the resistor RL, and the diagnostic circuit is also connected to the MCU. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/316
CPCG01R31/316
Inventor 杜露涛肖利华李祥童斌张学达
Owner 深蓝汽车科技有限公司
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