Daotong Technology has obtained a patent related to a charging circuit device that controls the charging current, enabling programmable constant voltage source and constant current charging.

March 21 News, according to the State Intellectual Property Office, Shenzhen Daotong Technology Co., Ltd. has applied for a patent titled “Charging Circuit and Charging Device,” with the authorization announcement number CN114928128B, granted on March 20, 2026. The application publication number is CN114928128A, application number CN202210374310.4, published on March 20, 2026. The application was filed on April 11, 2022. The inventor is Wang Weilin. The patent agency is Shenzhen LiuJia Intellectual Property Agency Co., Ltd., with patent agent Meng Liping. The classification codes are H02J7/40, H02J7/90, H02J7/92.

Patent Abstract: The embodiment of the present invention provides a charging circuit and charging device, including a charging power supply, a first switch, and a control unit; the charging power supply includes at least one programmable constant voltage source. The first switch is connected between the charging power supply and the battery; the control unit is connected to the charging power supply and the first switch respectively. The control unit obtains a first control voltage to control the first switch or a second control voltage to control the programmable constant voltage source based on the target charging current, thereby controlling the charging current and enabling the programmable constant voltage source to perform constant current charging.

Daotong Technology was established on September 28, 2004, and listed on the Shanghai Stock Exchange on February 13, 2020. The company’s registered and office addresses involve Guangdong Province and Hong Kong. It is a leading global provider of automotive intelligent diagnostic products and services, with advanced product technology and full industry chain advantages.

Daotong Technology’s main business includes the research and development, production, sales, and service of automotive intelligent diagnostic, testing and analysis systems, and automotive electronic components. It belongs to the Shenwan industry category of Computer - Computer Equipment - Other Computer Equipment, and involves concepts such as autonomous driving, millimeter-wave radar, and pre-profit and pre-increase concepts.

In 2025, Daotong Technology achieved excellent operating performance, with revenue reaching 4.833 billion yuan, ranking first among two companies in the industry, far exceeding the industry average and median of 2.792 billion yuan, with the second-ranked company, China Sike, only at 751 million yuan.

Its main business components are as follows:

In terms of net profit, in 2025, it reached 890 million yuan, also ranking first in the industry, with the industry average and median both at 480 million yuan. The second-ranked company, China Sike, had a net profit of only 69.41 million yuan.

Recent patent status of Shenzhen Daotong Technology Co., Ltd.:

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