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Overcurrent control circuit and power manager

A power manager and control circuit technology, applied in circuit devices, measuring current/voltage, emergency protection circuit devices, etc., can solve the problems of increasing the power loss of the sampling resistor and reducing the working efficiency of the circuit, so as to reduce the current and improve the instantaneous The effect of response speed and reduction of sampling power consumption

Pending Publication Date: 2021-03-12
成都市晶扬微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sampling current in the above method needs to pass through the sampling resistor, resulting in increased power loss of the sampling resistor, thereby reducing the working efficiency of the circuit

Method used

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  • Overcurrent control circuit and power manager
  • Overcurrent control circuit and power manager
  • Overcurrent control circuit and power manager

Examples

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Embodiment Construction

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific ...

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Abstract

The invention discloses an over-current control circuit and a power manager. The over-current control circuit comprises a first power supply module used for providing a power supply; an over-current detection module of which one end is electrically connected with the first power supply module, and the other end is electrically connected with a post-stage circuit, and which is used for setting an over-current threshold value and detecting the over-current state of the over-current control circuit; an over-current control module which is electrically connected with the over-current detection module and is used for controlling the connection state of the over-current detection module and the post-stage circuit according to the over-current state; and a second power supply module which is electrically connected with the over-current detection module and is used for providing a reference power supply, wherein the over-current detection module comprises a first field effect transistor, a second field effect transistor, a first voltage-controlled flow element, a second voltage-controlled flow element, a first resistor and a second resistor. According to the embodiment of the invention, the sampling power consumption of a sampling resistor can be reduced, and the over-current protection of the post-stage circuit is realized.

Description

technical field [0001] The invention relates to the field of overcurrent detection, in particular to an overcurrent control circuit and a power manager. Background technique [0002] At present, when the external circuit is short-circuited or damaged, it is necessary to protect the circuit. For example: when a USB hub is connected to a plug-and-play electronic device, the electronic device obtains power supply through the USB bus. In the event of a momentary short circuit of the electronic device or a damaged device connected to the USB, it is necessary to effectively protect the USB hub and the host device. However, since the above situation occurs from time to time during the use of computers or USB hubs, it is required in the USB specification to provide a recoverable current overload protection function for computers or self-powered hubs. [0003] In the related art, the over-current condition of the circuit is detected through a resistor series sampling technique. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H02H3/06G01R19/165
CPCG01R19/16571H02H3/066H02H3/08
Inventor 郑家强
Owner 成都市晶扬微电子有限公司
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