2results about How to "Realize automatic switching function" patented technology

The utility model discloses a hydraulic turbine governor double-oil-pump automatic switching control circuit which comprises a direct-current air switch QA1, a first pump circuit breaker Q1, a second pump circuit breaker Q2, a first pump contactor QC1, a thermal relay FR1, a second pump contactor QC2 and a thermal relay element which are connected through a main loop and a control loop, under the condition that PLC control is not needed to be added, the double-pump automatic switching function is achieved through a hardware loop, and the double-oil-pump automatic switching control circuit is simple in structure and convenient to operate. Oil pumps are used in turn, excessive use and abrasion of a single pump are avoided, the service life of equipment is prolonged, continuous operation of the system is ensured, the optimal operation state is kept, and efficiency is improved.

The utility model discloses a high-speed SD (Secure Digital) card read-write circuit based on bus switching, which relates to the technical field of data storage and transmission and comprises an SD card read-write circuit, a USB (Universal Serial Bus) interface circuit, a bus automatic switch switching circuit and a micro-control interface circuit, the SD card read-write circuit and the USB interface circuit are in bus connection with the bus automatic switch switching circuit, and the switching circuit is in bus connection with the micro-control interface circuit; a control pin of a USB end bus switching chip in the bus automatic switch switching circuit is grounded, and a power supply pin of the USB end bus switching chip is connected to a power supply input pin of the USB interface circuit; a control pin of a microcontroller end bus switching chip in the bus automatic switch switching circuit is connected to a power supply input pin of the USB interface circuit, and a power supply pin is connected to a power supply input pin of the microcontroller interface circuit. According to the utility model, the high-speed data storage of the microcontroller system and the data interaction between the PC end and the micro-control system through the high-speed USB interface can be automatically switched.