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Soft start circuit of switching power supply

A technology of soft start circuit and switching power supply, which is applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as input fuse blown, air switch cannot be closed, switching power supply cannot be put into normal operation, etc., to prevent impact The effect of current

Inactive Publication Date: 2015-06-10
吴汉肱
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a large inrush current amplitude at the moment the power is turned on will often cause the input fuse to blow out, and sometimes even burn out the contacts of the closing switch, or even cause the air switch to fail to close. The switching power supply cannot be put into normal operation

Method used

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  • Soft start circuit of switching power supply

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Embodiment Construction

[0010]

[0011] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0012] refer to figure 1 The schematic diagram of the circuit structure of the present invention is shown.

[0013] The soft start circuit of the present invention limits the start-up current at the moment of connection through the current-limiting resistor R1, charges the filter capacitor C1, and simultaneously assists the power supply Vcc to charge the capacitor C2 connected to the wire package of the relay K1 through the resistor R2. When the charging voltage on C2 reaches the operating voltage of the relay, K1 acts and bypasses the current limiting resistor R1 to achieve the effect of instantaneous anti-shock current.

[0014] More preferably, the primary coil of the transformer is connected in series with an NPN transistor, and the base of the NPN ...

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PUM

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Abstract

An embodiment of the invention discloses a soft start circuit of a switching power supply. By a current limiting resistor, the current of a rectified voltage is limited, and a first capacitor is charged; by a first transformer, the voltage of which the current is limited is transformed and outputted; and the current limiting resistor is connected with a normally open switch of a relay in parallel. The soft start circuit is arranged on an inputting circuit of the switching power supply and prevents surge current, and the switching power supply can run normally and reliably.

Description

technical field [0001] The invention relates to a starting circuit, in particular to a switching power supply soft starting circuit. Background technique [0002] At present, most of the input circuits of switching power supplies use rectification and capacitor filtering circuits. When the input is connected, a large instantaneous inrush current will be formed because the initial voltage on the capacitor is zero. Especially for high-power switching power supply, its input adopts a large-capacity filter capacitor, and its inrush current can reach more than 100A. Such a large inrush current amplitude at the moment the power is turned on will often cause the input fuse to blow out, and sometimes even burn out the contacts of the closing switch, or even cause the air switch to fail to close. As a result, the switching power supply cannot be put into normal operation. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 吴汉肱
Owner 吴汉肱
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