Driving circuit and controller

By designing a driving circuit including input sub-circuit, comparison sub-circuit and switch sub-circuit, the problem of not being able to disconnect the relay when the microcontroller drive fails, the relay disconnection control is realized in the case of failure, and the system safety and reliability are improved.

CN119694837APending Publication Date: 2025-03-25CHONGQING JINKANG POWER NEW ENERGY CO LTD
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Patent Information

Application Number
CN202411751244.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The existing relay driving circuit cannot disconnect the relay in time when the microcontroller drive fails, which poses a safety hazard.

Method used

A driving circuit is designed, including an input sub-circuit, a comparison sub-circuit and a switch sub-circuit. The drive signal output by the microcontroller is converted into a voltage signal through the input sub-circuit. The comparison sub-circuit determines whether the voltage signal is within the preset range. The switch sub-circuit controls the relay to be pulled or disconnected based on the comparison result.

Benefits of technology

Even in the case of failure of the microcontroller drive, the driving circuit can control the relay to be disconnected according to the level duration of the drive signal, improving the safety and reliability of the system.

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Abstract

The invention provides a driving circuit and a controller, and the driving circuit comprises an input sub-circuit which is connected with a driving pin and a first node of a single-chip microcomputer, and is configured to provide a first voltage signal which changes along with the level duration of a driving signal to the first node according to the driving signal outputted by the driving pin; the comparison sub-circuit is respectively connected with the first node and the second node, and is configured to provide a first level for the second node when the first voltage signal is in a preset voltage range, and provide a second level for the second node when the first voltage signal exceeds the preset voltage range; and the switch sub-circuit is respectively connected with the second node and the output end of the driving circuit, and is configured to provide an effective level for the output end to control the relay to be closed and provide an ineffective level for the output end to control the relay to be disconnected. According to the invention, the relay can be controlled to be switched off under the condition that the driving of the single chip microcomputer fails according to the level duration of the driving signal.
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