Reverse polarity protection circuit, intelligent switch and driving circuit

By using a voltage detection control switch circuit between the power supply terminal and the ground terminal to cut off the power supply path of the logic circuit and control the main switch to conduct, the problem of increased chip area and cost and power loss caused by Schottky diodes in the prior art is solved, and reverse polarity protection and power loss reduction are achieved.

CN115208369BActive Publication Date: 2026-07-21HANGZHOU SILAN MICROELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU SILAN MICROELECTRONICS CO LTD
Filing Date
2022-07-15
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing reverse polarity protection circuits provide a low-resistance current path by adding a Schottky diode, which increases chip area and cost. Furthermore, the internal semiconductor devices suffer significant power loss and are prone to breakdown during reverse polarity, affecting the chip's application in low-voltage circuits.

Method used

A reverse polarity protection circuit is designed, including a main switch and a logic circuit. By detecting the voltage between the power supply terminal and the ground terminal, the circuit controls the switching circuit to turn on and off, cuts off the power supply path of the logic circuit, and controls the main switch to turn on when a negative voltage is detected to reduce power loss.

Benefits of technology

This design achieves protection of the logic circuit from damage under reverse polarity conditions, while reducing the static power consumption of the main switch, preventing the intrinsic diode from being broken down under forward bias voltage, and improving the reliability and efficiency of the circuit.

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  • Figure CN115208369B_ABST
    Figure CN115208369B_ABST
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Abstract

The application discloses a reverse polarity protection circuit, an intelligent switch and a driving circuit. The intelligent switch comprises a main switch tube and a logic circuit. The reverse polarity protection circuit comprises a reverse polarity protection control circuit, which is connected with a power supply end and a grounding end respectively, is used for detecting a power supply voltage between the power supply end and the grounding end, and generates a second control signal according to the power supply voltage; a switch circuit, which is connected between the power supply end and the logic circuit, is used for controlling the conduction and turn-off of a power supply path of the logic circuit according to a third control signal, and provides a logic voltage to the logic circuit; and when the power supply voltage is detected as a negative voltage, the power supply path of the logic circuit is turned off. When the power supply voltage between the power supply end and the grounding end is detected as a negative voltage, the switch circuit is controlled to be turned off to cut off the power supply path of the logic circuit, reverse polarity protection is realized, and the main switch tube in the intelligent switch is controlled to be turned on to reduce the static power consumption when the battery is reversely connected.
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