Anti-peak energy absorbing circuit for a power tool

CN224342921UActive Publication Date: 2026-06-09ZHUHAI LINAI TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHUHAI LINAI TECHNOLOGY CO LTD
Filing Date
2025-07-15
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The freewheeling diodes in existing power tools are prone to damage under overload or stall conditions, leading to damage to the control circuit board. Furthermore, existing solutions cannot effectively absorb instantaneous currents in the tens of amperes and back electromotive forces lasting for hundreds of milliseconds, resulting in increased size or cost of power tools.

Method used

A reverse peak energy absorption circuit is composed of a nonpolar capacitor and/or diode, a controllable power switch, and a controllable freewheeling device (such as a MOSFET). By replacing the traditional diode with a MOSFET with low on-resistance, a low-power freewheeling loop is formed to absorb the peak current of the motor's back electromotive force and, when necessary, recharge the back electromotive force energy back to the drive power supply.

Benefits of technology

It achieves effective absorption of the back electromotive force of the motor while miniaturizing and reducing costs, thereby reducing the heat dissipation requirements of the control circuit board and improving the reliability and lifespan of the power tool.

โœฆ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a kind of anti-peak energy absorption circuit of electric tool, more specifically, it is related to a kind of anti-peak absorption part in the drive circuit of electric tool suitable for small assembly space. Including motor, controllable power switch in series with motor, current detection device installed in motor loop, central controller and drive power supply, it is characterized as, including instantaneous absorption device and controllable freewheeling device;The controllable freewheeling device is controlled by central controller, and its on-resistance or equivalent on-resistance is lower than 10mฮฉ.
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