Sungrow Power Supply has been granted a patent for a photovoltaic inverter, photovoltaic system, and method for controlling discharging. The invention includes a first DCDC converter, an inverter circuit, a first discharging circuit, and a controller. The discharging circuit is designed to discharge electrical energy from the port capacitor when a rapid shutdown instruction is received. The patent also includes a second group of Y capacitors and an insulation resistance detection circuit. 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 June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a photovoltaic inverter with rapid shutdown capability

Source: United States Patent and Trademark Office (USPTO). Credit: Sungrow Power Supply Co Ltd

A recently granted patent (Publication Number: US11683008B2) describes a photovoltaic inverter that includes a first direct current to direct current (DCDC) converter, an inverter circuit, a first discharging circuit, and a controller. The first DCDC converter is connected to a photovoltaic array and the inverter circuit. A port capacitor, consisting of an X capacitor and a group of Y capacitors, is connected between the positive and negative input ends of the first DCDC converter. The first discharging circuit is connected between the common terminal of the group of Y capacitors and a direct current bus, and is grounded. The controller is responsible for controlling the operation of the first discharging circuit when a rapid shutdown instruction is received, allowing it to discharge the electrical energy stored in the port capacitor.

Additionally, the patent describes variations of the photovoltaic inverter. In one embodiment, a second group of Y capacitors is connected between the positive and negative input ends of the inverter circuit, with the common terminal grounded. The first discharging circuit is configured to discharge the electrical energy stored in both the group of Y capacitors connected to the first DCDC converter and the group of Y capacitors connected to the inverter circuit. An insulation resistance detection circuit is included in this embodiment, consisting of resistors and controllable switches, to monitor and discharge the electrical energy.

The patent also discloses the use of a second DCDC converter, either non-isolated or isolated, in the photovoltaic inverter. In both cases, additional groups of Y capacitors are connected between the input and output ends of the second DCDC converter, with their common terminals grounded. The first discharging circuit is further configured to discharge the electrical energy stored in these additional groups of Y capacitors.

The patent also mentions the use of the photovoltaic inverter in a photovoltaic system, where it is connected to a photovoltaic array to convert the direct current electricity generated by the array into alternating current electricity.

In summary, the granted patent describes a photovoltaic inverter with various configurations and features, including the use of DCDC converters, discharging circuits, and insulation resistance detection circuits. These components work together to efficiently convert and manage the electrical energy generated by a photovoltaic array.

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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.