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Open circuit detection circuit for H-bridge drive output

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

Active Publication Date: 2020-06-16
深蓝汽车科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

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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  • Open circuit detection circuit for H-bridge drive output

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Embodiment Construction

[0018] 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 for an H-bridge drive output module, which relates to the technical field of intelligent vehicle domain controllers of vehicle control systemsof new energy vehicles. When the control circuit controls the plurality of MOS transistors of the H-bridge drive output module to keep a disconnected state, however, the P-MOS Q21 is closed, at the time, the power supply voltage flows through the first resistor R1 and the P-MOS Q21 and then is transmitted to the load. Voltage values at the two ends of a load M are collected and recorded through the collection circuit and are recorded as U1 and U2. And the two voltage values are sent to a preset difference value in the diagnosis circuit for comparison, so that whether the H-bridge drive outputis in an open circuit state or a non-open circuit state can be judged, and the technical problem that the H-bridge drive output module cannot perform open circuit detection is solved. The H-bridge drive output module can perform open circuit detection on the H-bridge drive output module under the condition that a plurality of MOS transistors are not powered on.

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 negative electrode of the H bridge drive output module is connected to a resistor RL and a diagnostic circuit, and the H br...

Claims

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Application Information

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Patent Type & Authority Applications(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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