Burst current suppressing circuit and power supply equipment using the same
A power supply device, surge current technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc. Component life and other issues
Inactive Publication Date: 2007-10-31
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
The instantaneous maximum value of surge current can cause damage to components such as fuses and switches, thereby reducing the service life of components and reducing the stability of power supply for network equipment
Method used
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[0010] FIG. 1 is a circuit diagram of a power supply device 1 of the present invention. The power supply device 1 includes a transformer circuit 10 , a rectification filter circuit 11 and a surge current suppression circuit 12 .
[0011] The transformer circuit 10 is used to receive the input signal V in , and the input signal V in converted to an AC signal V 1 . In this embodiment, the input signal V in is the mains signal. The rectification and filtering circuit 11 is connected to the transformer circuit 10 for converting the AC signal output by the transformer circuit 10 into a DC signal. The surge current suppressing circuit 12 is connected to the rectifying and filtering circuit 11, and is used to suppress the surge current generated in the power supply device 1, and output another DC signal V out to the load (not shown). In this embodiment, the inrush current suppression circuit 12 also has a short circuit protection function, which can provide short circuit prote...
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A sudden wave current restraining circuit includes transistor, switch and short protection circuit. Thereinto, emitter of the transistor is the input end of the sudden wave current restraining circuit. The switch possesses input terminal, the first output terminal and the second output terminal. Thereinto, the input terminal is connected with the collector of the transistor, and the output terminal is the output terminal of the sudden wave current restraining circuit. The short protection circuit possesses the first terminal, the second terminal and the third terminal, thereinto, the first terminal of the short protection circuit is connected with the first output terminal of the switch, the second terminal is connected with the base pole of the transistor, and the third terminal is connected with the second terminal is connected with the second output terminal. The sudden wave current restraining circuit in the invention possesses function of short protection, at the same time with restraining the sudden wave current, it can protect load to make it work normally.
Description
technical field [0001] The invention relates to a surge current suppression circuit, in particular to a surge current suppression circuit with short circuit protection and a power supply device using the same. Background technique [0002] With the development of technology, various network devices, such as Asymmetric Digital Subscriber Loop Modem (ADSL Modem), Cable Modem (Cable Modem), and digital set-top box (Set-top Box) are more and more widely used. These network devices all need a power supply device, which is used to convert the AC voltage of the mains power supply (for example: 220V in mainland China, 110V in North America.) into a DC voltage suitable for network equipment. However, when the power supply device is initially turned on, the capacitive effect in the circuit will generate an unpredictable instantaneous current, that is, an inrush current. The instantaneous maximum value of the surge current can cause damage to components such as fuses and switches, the...
Claims
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Inventor 王信雄杨舜丞江国维
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD