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Soft startup circuit of switch power supply and its startup method

A technology of soft start circuit and switching power supply, which is applied in the direction of electrical components, adjusting electric variables, output power conversion devices, etc. It can solve the problems of large peak current and rise, and achieve the effect of avoiding peak current

Active Publication Date: 2009-08-12
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, the external power supply VPPO output by the switch unit PSD rises sharply to a high potential according to the switch control signal VG, and will generate a huge peak current due to the connection of devices that consume a large load current

Method used

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  • Soft startup circuit of switch power supply and its startup method
  • Soft startup circuit of switch power supply and its startup method
  • Soft startup circuit of switch power supply and its startup method

Examples

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Embodiment Construction

[0014] The above-mentioned and other objects and features of the present invention will become clearer through the following description in conjunction with the accompanying drawings exemplarily showing an example.

[0015] Such as image 3 As shown, the switching power supply 300 of the present invention is used to convert a first power supply VPP (for example, 3V) into a second power supply VPPO output, which includes a control unit 301, a switching unit PSD, a bias circuit 303, and a voltage drop control Unit 306. In this embodiment, the switch unit PSD is realized by a PMOS transistor. The control unit 301 is used for outputting a first bias signal Nbias, a second bias signal Pbias, a pulse signal CPDN and a switch control signal VG according to an external clock CLK and a soft start enable signal EN. Wherein, the first bias signal Nbias and the second bias signal Pbias are both current mirror bias signals. The initial value of the switch control signal VG is high, and its pot...

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PUM

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Abstract

The invention is concerned with the soft-start circuit of the switch power and its method, which is generating the second power with the first power. It includes: the controlling unit, which generates the impulse signal, the switch control signal and the first off-set signal, according to the exterior clock and the soft-start active signal; the off-set circuit, generates the first prearranged electric potential with the first power accordingly to make the electric potential of the switch control signal migrates to the first prearranged electric potential; the pressure drop control unit, according to the impulse signal and the first off-set signal to make the electric potential of the switch control signal migrates to the second prearranged electric potential from the first prearranged electric potential; and the switch unit, generates the second power according to the switch control signal and the first power. The inventions keeps the voltage of the switch control signal descends steadily, and makes the output second power of the switch ascends, which prevents the biggish peak current appearing in the process of soft-start.

Description

Technical field [0001] The invention relates to a switching power supply, in particular to a switching power supply supporting soft start operation. Background technique [0002] A switching power supply is used to convert power from one power supply to another. For example, a personal computer can supply power to external devices such as memory cards and digital players through the switching power supply. figure 1 Shown is a schematic diagram of a switching power supply in the prior art. Such as figure 1 As shown, the switching power supply 100 is used to convert a local power supply VPP into an external power supply VPPO to supply power to external devices. The switching power supply 100 includes a control unit 101, a switching unit PSD, and inverters INV1 and INV2. The control unit 101 outputs a clock signal 102 and a switch control signal VG according to an external clock CLK and a soft start enable signal EN. After the soft start operation ends, the control unit 101 stabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M3/10H02M3/155
Inventor 姜凡
Owner VIA TECH INC
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