A power supply circuit, terminal accessories and method for preventing voltage backflow
A technology of power supply circuit and power supply, applied in the direction of electrical components, circuit devices, DC network circuit devices, etc.
Active Publication Date: 2022-03-15
SHENZHEN GREEN CONNECTION TECH CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Efficiency and switching issues with dual power supplies are unresolved issues in the field of dual power supplies
Method used
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Embodiment 1
[0036] Please refer to image 3 , is a schematic structural diagram of a power supply circuit in an embodiment, including a first output channel circuit 1 , a second output channel circuit 3 and a power-off isolation circuit 2 . The first output channel circuit 1 is connected between the first power supply input terminal IN1 for the input of the first power supply and the power supply circuit output terminal OUT for providing power to the load, so as to input the first power supply input terminal IN1 The first power supply is output to the output terminal OUT of the power supply circuit. The second output channel circuit 3 is connected between the second power supply input terminal IN2 for the input of the second power supply and the power supply circuit output terminal OUT for providing power to the load, so as to input the second power supply input terminal IN2 The second power supply is output to the output terminal OUT of the power supply circuit. The power failure isola...
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A power supply circuit, comprising a first power supply input terminal and a second power supply input terminal, respectively connected to the first power supply input terminal for the input of the first power supply and the second power supply input terminal for the input of the second power supply Between the power supply input terminal and the power supply circuit output terminal for supplying power to the load, so as to output the first power supply and the second power supply input from the first power supply input terminal and the second power supply input terminal to the power supply circuit output end. It also includes a power failure isolation circuit, which is used to isolate the input terminal of the first power supply when the first power supply loses power, so as to prevent the voltage at the output terminal of the power supply circuit from flowing back to the input terminal of the first power supply, and is also used for when the second power supply When power is off, the input end of the second power supply is isolated to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply. Since the power-off isolation circuit isolates the power-off input end, the voltage at the output end will not flow back to the power-off input end.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a power supply circuit, a terminal accessory and a method for preventing voltage backflow. Background technique [0002] At present, the power supply circuit of a communication interface often needs to maintain data communication during use, such as a plug-and-play device interface, including a USB interface. Among them, the USB interface takes into account both power supply and communication functions. Due to the large power consumption of some loads, using the USB interface alone for power supply cannot guarantee the full function of the load. Therefore, an external power supply port is usually added to the load to use dual power supplies to supply power to the load. Efficiency and switching issues with dual power supplies are unresolved issues in the field of dual power supplies. Contents of the invention [0003] The present application provides a power supply c...
Claims
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IPC IPC(8): H02J1/10
CPCH02J1/108
Inventor 张清森陈俊灵曹昌盛
Owner SHENZHEN GREEN CONNECTION TECH CO LTD