Gallium nitride motor controller and resonance elimination method

By introducing freewheeling diodes, absorption capacitors, and bleeder resistors into the gallium nitride motor controller, the energy absorption and bleeder paths are optimized, solving the problem of resistor overheating damage under high-frequency switching conditions. This achieves effective suppression of high-frequency resonance and reliable protection of the switching transistor, improving system reliability and energy efficiency.

CN122178699APending Publication Date: 2026-06-09SUZHOU GACHUANG JINGHE TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610244841.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-02
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Under high-frequency switching conditions, the resistors in traditional RC absorption circuits are prone to overheating and damage, leading to the failure of the protection function of the gallium nitride switch and poor system reliability.

Method used

A gallium nitride motor controller is adopted, including a freewheeling diode, a snubber capacitor, and a discharge resistor. The energy absorption and discharge path is optimized. The snubber capacitor absorbs the resonant energy of the inductance and parasitic capacitance, and the discharge resistor dissipates it smoothly.

Benefits of technology

It effectively suppresses high-frequency resonance, reduces the voltage oscillation frequency and voltage spikes of the switching transistor, improves device lifespan, optimizes electromagnetic compatibility and energy efficiency, and meets the requirements of high-precision servo control and long-endurance UAVs.

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Abstract

The invention relates to a gallium nitride motor controller and a resonance elimination method, belongs to the technical field of power electronics, and solves the problem that when a traditional RC (Resistance-Capacitance) absorption circuit is adopted, a resistor is easy to damage due to overheating under a high-frequency switching condition, so that a protection function fails. The controller comprises a power supply control device which is connected in series with the motor, controls the power-on and power-off of the motor, and comprises a gallium nitride switch tube with a parasitic capacitor; the resonance elimination circuit is connected to the power supply control device, the follow current diode is connected in series with the absorption capacitor and the discharge resistor which are connected in parallel, and when the gallium nitride switching tube is in a turn-off stage, current is conducted forwards through the follow current diode to charge the absorption capacitor, so that the voltage of the absorption capacitor is gradually increased; and when the gallium nitride switching tube is in an energy discharge stage and the voltage of the capacitor rises to a preset voltage, the resistor is used for discharging, and electric energy is converted into heat energy for stable dissipation. And effective suppression of high-frequency resonance and reliable protection of the switching tube are realized.
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