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Power circuit

A power circuit and current source technology, applied in circuits, circuit devices, emergency protection circuit devices, etc., can solve problems such as damaged components, power circuit input voltage dips, electromagnetic interference, etc., to avoid reducing, reducing inrush current, Avoid damaging effects

Active Publication Date: 2020-12-01
EXCELLIANCE MOS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inrush current will not only cause the input voltage of the power circuit to drop sharply, causing serious electromagnetic interference (EMI), but what is more, it will cause electrical overstress (EOS) and damage the components in the power circuit

Method used

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Embodiment Construction

[0056] In order to make the content of the present invention more comprehensible, the following specific embodiments are taken as examples in which the present invention can indeed be implemented. In addition, wherever possible, elements / members / steps with the same reference numerals are used in the drawings and embodiments to represent the same or similar parts.

[0057] figure 1 It is a schematic circuit block diagram of a power supply circuit 100 according to an embodiment of the present invention. Please refer to figure 1 , the power circuit 100 may include a switch circuit 120 and a soft-start control circuit 140, but is not limited thereto. The first terminal of the switch circuit 120 is used for receiving the input voltage VIN. The control terminal of the switch circuit 120 is used for receiving the control signal VG. The second end of the switch circuit 120 is used to provide the output voltage VOUT. The soft-start control circuit 140 is coupled to the second end ...

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PUM

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Abstract

A power circuit including a switching circuit and a soft start control circuit is provided. A first terminal of the switching circuit is configured to receive an input voltage. A control terminal of the switching circuit receives a control signal. A second terminal of the switching circuit is configured to provide an output voltage. The soft start control circuit generates the control signal according to the output voltage and a first reference voltage to control a turn-on state of the switching circuit. The soft start control circuit switches a slope of the control signal from a first slope to a second slope after the switching circuit is turned on and when a voltage value of the control signal is equal to a second reference voltage, wherein the first slope is less than the second slope to reduce an inrush current at the time when the switching circuit is turned on.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a power supply circuit capable of reducing surge current. Background technique [0002] Generally, an inrush current is generated at the moment when the power circuit is activated. The surge current will not only cause the input voltage of the power circuit to drop sharply, causing severe electromagnetic interference (EMI), but what is more, it will cause electrical overstress (EOS) and damage the components in the power circuit. Therefore, how to reduce the surge current generated when the power circuit is activated is one of the major issues faced by those skilled in the art. Contents of the invention [0003] In view of this, the present invention provides a power circuit, which can effectively reduce the surge current when the power circuit is started. [0004] The power supply circuit of the present invention includes a switch circuit and a soft start control circuit. The first...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32
CPCH02M1/36H02M1/32H02M1/0038G05F1/575G05F1/468H02H9/002H03K17/0822
Inventor 简铭宏李敬赞
Owner EXCELLIANCE MOS