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., can solve the problem of reducing the service life of components and reducing the stability of power supply of network equipment sex, damage, etc.
Inactive Publication Date: 2009-11-18
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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- Application Information
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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] figure 1 Shown is a circuit diagram of the 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 ci...
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A surge current suppression circuit includes a transistor, a switch element and a short circuit protection circuit. Among them, the emitter of the transistor is used as the input terminal of the surge current suppression circuit. The switch element has an input end, a first output end and a second output end, wherein the input end of the switch element is connected to the collector of the transistor, and the second output end is used as the output end of the surge current suppression circuit. The short-circuit protection circuit has a first terminal, a second terminal, a third terminal, and first and second voltage dividing resistors, wherein the first terminal is connected to the first output terminal of the switching element, and the second terminal is connected to the base of the transistor , the third end of which is connected to the second output end of the switch element, the first voltage dividing resistor is connected between the first end and the second end, and the second voltage dividing resistor is connected between the second end and the third end. The surge current suppressing circuit adopted in the present invention has a short-circuit protection function, and can also provide short-circuit protection for the load while suppressing the surge current, so as to maintain the normal operation of the load.
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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IPC IPC(8): H02H9/02
Inventor 王信雄杨舜丞江国维
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD