CN220475409U

CN220475409U - Anti-reverse connection module based on high-power vehicle-mounted equipment input power supply

Info

Publication number: CN220475409U
Application number: CN202321912905.7U
Authority: CN
Inventors: 李永忠; 李旋
Original assignee: Jilin Hangtai Electronics Co ltd
Current assignee: Jilin Hangtai Electronics Co ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2024-02-09
Anticipated expiration: 2033-07-20

Abstract

The utility model provides an anti-reverse connection module based on a high-power vehicle-mounted equipment input power supply, which comprises the following components; a voltage dividing resistor R1, a voltage dividing resistor R2, a voltage stabilizing diode D and an NMOS tube Q; the divider resistor R1 comprises a 1 pin and a 2 pin; the divider resistor R2 comprises a 1 pin and a 2 pin; the zener diode D comprises a pin 1 positive electrode and a pin 2 negative electrode; the NMOS tube Q comprises a pin 1 grid electrode, a pin 2 drain electrode and a pin 3 source electrode; the positive electrode of the power supply is connected with the 1 pin of the resistor R1; the pin 2 of the resistor R1 is simultaneously connected with the pin 1 of the resistor R2, the grid electrode of the Q pin 1 of the NMOS tube and the cathode of the D pin 2 of the zener diode; the source electrode of the NMOS tube Q pin 3 is simultaneously connected with the 2 pin of the resistor R2, and the anode of the voltage stabilizing diode D pin 1; the drain electrode of the NMOS tube Q pin 2 is connected with the negative electrode of the power supply. The utility model adopts two resistors, one voltage stabilizing diode and one N channel MOS tube, thus realizing reverse connection prevention of power input and extremely low power consumption.

Description

Anti-reverse connection module based on high-power vehicle-mounted equipment input power supply

Technical Field

The utility model relates to the technical field of automobile electronics, in particular to an anti-reverse connection module based on an input power supply of high-power vehicle-mounted equipment.

Background

Most of the existing power inputs of the vehicle-mounted equipment have no reverse connection preventing function, only have an input overcurrent protecting function, and the power is reversely connected, so that fuses are burnt out.

At present, no independent reverse connection preventing module exists, but some high-end power modules have reverse connection preventing functions, and the cost is increased obviously.

The current common method is to connect a diode in series with the power input terminal, because the diode has unidirectional conductivity, and no electricity exists in the subsequent circuit. In the anti-reverse connection circuit of the diode, a certain voltage drop exists due to the characteristic of the diode. For a schottky diode SS14 with a relatively low voltage drop, the forward voltage drop at a load current of 1A is 550mV, and the power consumption lost by the diode is 550mW. However, in a high-power vehicle-mounted device, if the input current reaches 10A, this loss is more remarkable and diode selection is more difficult.

Therefore, it has become an important direction to design an input power reverse connection preventing module capable of solving the above problems.

Disclosure of Invention

Based on the above-mentioned current situation, the main purpose of the utility model is to provide a power input reverse connection prevention module based on high-power vehicle-mounted equipment, which can realize power input reverse connection prevention and consume extremely low power by adopting two resistors, a zener diode and an N-channel MOS tube.

An anti-reverse connection module based on a high-power vehicle-mounted equipment input power supply comprises; a voltage dividing resistor R1, a voltage dividing resistor R2, a voltage stabilizing diode D and an NMOS tube Q;

the divider resistor R1 comprises a 1 pin and a 2 pin;

the divider resistor R2 comprises a 1 pin and a 2 pin;

the zener diode D comprises a pin 1 positive electrode and a pin 2 negative electrode;

the NMOS tube Q comprises a pin 1 grid electrode, a pin 2 drain electrode and a pin 3 source electrode;

the positive electrode of the power supply is connected with the 1 pin of the resistor R1;

the pin 2 of the resistor R1 is simultaneously connected with the pin 1 of the resistor R2, the grid electrode of the Q pin 1 of the NMOS tube and the cathode of the D pin 2 of the zener diode;

the source electrode of the NMOS tube Q pin 3 is simultaneously connected with the 2 pin of the resistor R2, and the anode of the voltage stabilizing diode D pin 1;

the drain electrode of the NMOS tube Q pin 2 is connected with the negative electrode of the power supply.

The beneficial effects of the utility model are as follows:

(1) The power supply of the high-power vehicle-mounted equipment is reversely connected;

(2) The power consumption is low;

(3) The used elements are few, and the volume is small;

drawings

FIG. 1 is a schematic diagram of the circuit principle of the present utility model;

Detailed Description

The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

In the present specification, the words "upper", "lower", "left", "right" and the like indicate directions are words of convenience only and are not limiting.

the divider resistor R1 comprises a 1 pin and a 2 pin;

the divider resistor R2 comprises a 1 pin and a 2 pin;

The main working principle is as follows: when the power supply is connected correctly, the NMOS body diode is conducted, the R1 and the R2 are connected in series to divide the voltage, the R2 provides positive voltage drop for two ends of the Vgs, the channels at two ends of the MOS DS are conducted, the body diode is short-circuited, and a current loop is provided for the load. And D is an overvoltage protection diode, protects the MOS tube and prevents damage to the MOS tube caused by too high Vgs voltage of the MOS tube. When the MOS tube is completely conducted, for a general NMOS tube, the Rds of the MOS tube can be a few mΩ, and the loss of the MOS tube at the 1A load current is about a few mW. Compared with the power consumption of 550mW of the diode, the MOS tube is used, so that the loss of power input can be effectively reduced. When the power supply is reversely connected, the grid source electrode does not have a forward voltage difference, so that the drain source electrode cannot form a conducting channel, the resistance value Rds of the MOS tube is very large and is equivalent to an open circuit state, and the circuit cannot form a current loop, so that the reverse connection is prevented.

The foregoing is merely an example of the present utility model, and the specific structures and features of common knowledge known in the art are not described herein too much, so that those skilled in the art will readily understand that the scope of the present utility model is not limited to such specific embodiments. Variations and modifications can be made without departing from the scope of the utility model, which is to be considered as limited to the details of construction and the utility of the patent.

Claims

1. An anti-reverse connection module based on an input power supply of high-power vehicle-mounted equipment is characterized by comprising; a voltage dividing resistor R1, a voltage dividing resistor R2, a voltage stabilizing diode D and an NMOS tube Q;

the divider resistor R1 comprises a 1 pin and a 2 pin;

the divider resistor R2 comprises a 1 pin and a 2 pin;