Sungrow Power Supply has been granted a patent for an inverter circuit control method and device. The method involves adjusting a modulation harmonic wave in a sinusoidal pulse width modulation (SPWM) signal based on the DC bus voltage and output leakage current of the target inverter circuit. This ensures that the total harmonic distortion of the current remains within a preset range. GlobalData’s report on Sungrow Power Supply gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Sungrow Power Supply, Smart energy mgmt systems was a key innovation area identified from patents. Sungrow Power Supply's grant share as of September 2023 was 65%. Grant share is based on the ratio of number of grants to total number of patents.
Inverter circuit control method adjusting modulation harmonic wave
A recently granted patent (Publication Number: US11722072B2) describes an inverter circuit control method for managing the modulation of a sinusoidal pulse width modulation (SPWM) signal in an inverter circuit. The method involves determining the direct current (DC) bus voltage and the output leakage current of the target inverter circuit. Based on the DC bus voltage, the method determines whether the target inverter circuit satisfies a preset modulation condition. If the condition is met, the method adjusts the modulation harmonic wave to be injected into the SPWM signal to ensure that the total harmonic distortion of the current remains within a preset range.
The patent also discloses that the determination of whether the target inverter circuit satisfies the preset modulation condition is based on the difference between the positive and negative half-loop bus voltages. If the absolute value of this voltage difference exceeds a preset voltage threshold, the target inverter circuit is considered to satisfy the modulation condition. Otherwise, it does not.
Furthermore, the method adjusts the modulation harmonic wave based on the absolute value of the target voltage difference and the output leakage current. If the output leakage current is less than or equal to a preset current threshold, the modulation harmonic wave is adjusted according to the absolute value of the target voltage difference. On the other hand, if the output leakage current exceeds the preset current threshold, the modulation harmonic wave is adjusted based on the output leakage current.
The patent also describes the use of preset mapping relationships to determine the target harmonic wave amplitude corresponding to the target voltage difference and the output leakage current. These mapping relationships record the correspondence between the absolute value of the voltage difference or the output leakage current and the harmonic wave amplitude. The amplitude of the modulation harmonic wave is then adjusted accordingly.
Additionally, the patent includes claims related to an inverter circuit and a photovoltaic system incorporating the described inverter circuit control method.
Overall, this patent presents a method for controlling the modulation of an inverter circuit to ensure that the total harmonic distortion of the current remains within a preset range. The method takes into account the DC bus voltage, the output leakage current, and the voltage difference between the positive and negative half-loop bus voltages to adjust the modulation harmonic wave injected into the SPWM signal. This technology has potential applications in various fields, including photovoltaic systems.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
