Hopewind Electric applies for inverter resonance detection related patent, achieving inverter resonance detection and protection without increasing hardware.

March 26 News: According to the State Intellectual Property Office, Shenzhen HeWang Electric Co., Ltd. has applied for a patent titled “Resonance Detection and Protection Method for Inverter System.” The application publication number is CN121710130A, the application number is CN202512011921.9, the publication date is March 20, 2026, and the application date is December 29, 2025. The inventors are Xiao Nianlei, Tan Pengfei, Zhou Dangsheng, Chen Li, Wen Xikai, and Xie Feng. The patent agency is Shenzhen Elite Innovation Intellectual Property Agency, with patent agent Luo Senbao. The classification codes are H02H7/122 and H02M1/00.

Patent Abstract: The invention discloses a resonance detection and protection method for inverter systems, including: obtaining the input capacitor voltage of the inverter; using a preset discrete analysis algorithm to determine the voltage discretization level based on the input capacitor voltage, and judging whether this level exceeds a preset threshold; if it does, controlling the inverter’s disconnect switch to disconnect and output a resonance fault indicator. This method can reliably detect and suppress resonance without adding any hardware circuits, effectively preventing failure of the inverter’s disconnect switch and input capacitor due to resonance, improving system safety, and reducing hardware costs.

HeWang Electric was established on April 20, 2007, and listed on the Shanghai Stock Exchange on July 28, 2017. The registered and office address is in Shenzhen, Guangdong Province. The company is a leading enterprise in China’s wind power inverter industry, with core products featuring technological barriers.

HeWang Electric focuses on power conversion, helping customers achieve efficient, reliable, high-quality power generation, consumption, and transmission. It belongs to the Shenwan industry category of Power Equipment - Wind Power Equipment - Wind Power Components, involving energy storage, offshore wind, and wind energy sectors.

In 2025, HeWang Electric’s revenue reached 4.168 billion yuan, ranking second among four industry companies, behind Dajin Heavy Industry with 6.174 billion yuan. The industry average is 4.198 billion yuan, with a median of 4.064 billion yuan. Its main business revenue is 3.291 billion yuan in new energy electric control, accounting for 78.96%. Net profit was 541 million yuan, also ranked second, with an industry average of 511 million yuan and a median of 428 million yuan.

Recent patent applications by Shenzhen HeWang Electric Co., Ltd.:

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