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Direct current anti-reverse polarity circuit using MOS (metal oxide semiconductor) tube

An anti-reverse connection circuit and MOS tube technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as damage to the input voltage port, power module burnout, and inability to prevent reverse connection, etc., to achieve the effect of protecting the circuit

Inactive Publication Date: 2015-06-03
XIAN GUOLONG BAMBOO TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this does not eliminate the phenomenon of reverse connection, and once it is reversed, it will inevitably damage the input voltage port and cause the power module to burn out, etc.

Method used

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  • Direct current anti-reverse polarity circuit using MOS (metal oxide semiconductor) tube

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Embodiment Construction

[0009] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0010] Such as figure 1 As shown, a DC anti-reverse connection circuit using MOS tubes includes fuse F1, diode D1, resistor R1, voltage regulator tube D2 and MOS tube Q1, wherein: fuse F1 is connected between the external power supply and the input terminal of the system power supply, The anode of diode D1 is connected to the external power supply of the system, the cathode is connected to one end of resistor R1, the other end of resistor R1 is connected to the cathode of regulator D2 and the grid of MOS transistor Q1, the anode of regulator D2 and the drain of MOS transistor Q1 are grounded, The source of the MOS transistor Q1 is connected to the system ground.

[0011] In the present invention, when the voltage is positively connected, after Vin passes through D1\R1\D2, the gate voltage of Q1 is kept at the stable voltage level of D2, so that...

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Abstract

The invention discloses a direct current anti-reverse polarity circuit using an MOS (metal oxide semiconductor) tube. The direct current anti-reverse polarity circuit comprises a diode D1, a resistor R1, a voltage-regulator tube D2 and the MOS tube Q1, wherein the anode of the diode D1 is connected with an external power supply of a system, and the cathode of the diode D1 is connected with one end of the resistor R; the other end of the resistor R1 is connected with the cathode of the voltage-regulator tube D2 and the grid of the MOS tube Q1; the anode of the voltage-regulator tube D2 and the drain of the MOS tube Q1 are grounded; the source of the MOS tube Q1 is connected with the grounded end of the system. According to the direct current anti-reverse polarity circuit disclosed by the invention, by utilizing the turnon and turnoff characteristics of the MOS tube, a current loop is cut off after reverse polarity of input voltage, and the circuit protection goal is achieved.

Description

technical field [0001] The invention belongs to the technical field of power supplies, in particular to a DC anti-reverse connection circuit using a MOS tube. Background technique [0002] There are many independent power modules in the electronic system, and the input terminal of the power module mainly distinguishes the polarity by means of mechanical or pattern marking, which provides a guiding solution. However, this does not eliminate the phenomenon of reverse connection, and once it is reversed, it will inevitably damage the input voltage port and cause the power module to burn out. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a DC anti-reverse connection circuit using MOS transistors to prevent damage to the system power supply module when the polarity of the input voltage is reversed. [0004] In order to achieve the above object, the technical scheme ad...

Claims

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Application Information

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IPC IPC(8): H02H11/00
Inventor 沈建荣
Owner XIAN GUOLONG BAMBOO TECH
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