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Kewell has been granted an invention patent: "A discharge resistance control circuit and its control method for testing power supplies"

Article Source：Qichacha | Author：Securities Star | Issuing Time：2024.05.29
Securities Star News: According to data from Qichacha, Kewell (688551) has obtained a new invention patent authorization, titled "A Test Power Supply Discharge Resistance Control Circuit and Its Control Method". The patent application number is CN202011278505.6, and the authorization date is May 28, 2024.

Patent abstract: A discharge resistance control circuit and its control method for a testing power supply, relating to the field of testing power supply technology. The circuit includes a DC power supply, capacitor C, discharge resistance R, power switch Q, main control chip MCU, operational amplifier, and load; Capacitor C is connected in parallel at both ends of the DC power supply, discharge resistor R is connected in series with power switch Q and connected in parallel at both ends of capacitor C, and the load is connected at both ends of capacitor C; The output end of the operational amplifier is connected to the main control chip MCU, and the input end collects the output voltage UO at both ends of the load; The output terminal of the main control chip MCU is connected to the Q-gate of the power switch tube; In the method, the main control chip MCU sends the difference between the collected output voltage UO and the voltage given Uref to the main control chip MCU. After processing, the main control chip MCU sends a control signal to control the opening and closing of the power switch Q, thereby controlling the operation of the discharge resistor R; Simple hardware circuit and low cost; The fast action of the discharge resistor improves the dynamic performance and safety of the power supply, and prevents frequent action of the discharge resistor from causing burning.


Attached drawings of patent abstract

Since the beginning of this year, Kewell has obtained 33 new patent authorizations, an increase of 13.79% compared to the same period last year. Based on the financial data of the company's 2023 annual report, the company invested 82.3293 million yuan in research and development, a year-on-year increase of 7.32%.
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