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A current sampling circuit, overcurrent protection circuit and control method thereof

A current sampling and circuit technology, which is applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, emergency protection circuit device, measuring current/voltage, etc., can solve the problem of no temperature compensation, insufficient accuracy, long feedback time, etc. problem, to achieve the effect of improving accuracy and speed

Active Publication Date: 2019-01-11
HANGZHOU MPS SEMICON TECH
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Problems solved by technology

[0002] Digital synchronous control circuits are widely used in communication systems and network systems. In digital synchronous control circuits, the traditional current sampling method is to couple an external resistor outside the chip, which requires adding a pin on the chip. increased cost
In addition, there is no temperature compensation function in the traditional overcurrent protection circuit and the traditional current sampling circuit
With the development of digital control circuits, the accuracy of the current sampling method and the overcurrent protection method of coupling resistors outside the chip is not enough, and the feedback time is too long

Method used

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  • A current sampling circuit, overcurrent protection circuit and control method thereof
  • A current sampling circuit, overcurrent protection circuit and control method thereof
  • A current sampling circuit, overcurrent protection circuit and control method thereof

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only used for illustration, and are not intended to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0025] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of ...

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Abstract

The invention discloses a current sampling circuit, the control method of the current sampling circuit, an overcurrent protection circuit, and a method of using the current sampling circuit for overcurrent protection. The current sampling circuit comprises a first resistor, a second resistor, a digital-to-analog conversion module, and a reference ground. The first resistor is provided with a first end used for receiving reference current and a second end coupled with the reference ground. First voltage exits between the first end of the first resistor and the reference ground. The second resistor is provided with a first end used for receiving input current and a second end coupled with the reference ground, and second voltage exists between the first end of the second resistor and the reference ground. The digital-to-analog conversion module is used to convert the first voltage to a first digital signal, and is used to convert the second voltage to a second digital signal, and is used to generate a sampling current digital signal based on the first digital signal and the second digital signal. Compared with the prior art, the temperature compensation function of the current sampling circuit and the temperature compensation function of the overcurrent protection circuit are realized, and the precision and the speed of the current sampling and the overcurrent protection are improved.

Description

technical field [0001] The present invention relates to an electronic circuit, specifically but not limited to a current sampling circuit and a control method thereof. Background technique [0002] Digital synchronous control circuits are widely used in communication systems and network systems. In digital synchronous control circuits, the traditional current sampling method is to couple an external resistor outside the chip, which requires adding a pin on the chip. Increased costs. In addition, neither the traditional overcurrent protection circuit nor the traditional current sampling circuit has a temperature compensation function. With the development of digital control circuits, the accuracy of the current sampling method and the overcurrent protection method of coupling resistors outside the chip are not enough, and the feedback time is too long. Contents of the invention [0003] In order to solve one or more technical problems of the above-mentioned prior art, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02G01R19/00
CPCG01R19/00H02H9/02
Inventor 姜礼节董岩胡望淼欧阳茜
Owner HANGZHOU MPS SEMICON TECH
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