CN205841071U - A kind of circuit for automobile starter - Google Patents

Abstract

This utility model discloses a kind of circuit for automobile starter, including ignition switch signal acquisition module, controller, metal-oxide-semiconductor module, resistance R and starter M, power supply is connected with ignition switch, ignition switch is connected with resistance R one end and metal-oxide-semiconductor module respectively, described resistance R is connected with starter, described ignition switch signal acquisition module is transferred to controller after collecting the closure signal of ignition switch, described controller is connected with metal-oxide-semiconductor module, described metal-oxide-semiconductor module is in parallel with resistance R, described metal-oxide-semiconductor module at least includes two metal-oxide-semiconductors, between metal-oxide-semiconductor parallel with one another, the outfan of controller inputs the grid to metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is connected between resistance R and ignition switch, source electrode is connected between resistance R and starter.This utility model simple in construction, it is easy to accomplish, it is possible to protect the starter of the automobile equipped with start stop system, extend the life-span of starter.

Description

A kind of circuit for automobile starter

Technical field

This utility model relates to a kind of circuit, particularly to a kind of protection circuit for automobile starter.

Background technology

In recent years, in order to effectively reduce idling oil consumption, reduce the discharge of automobile harmful gas, be provided with start stop system The vehicle of (Start Stop System) gets more and more.Start stop system (Start Stop System) is a micro-hybrid Technology.This system makes automobile suspend electromotor work when waiting red light or traffic congestion, when driver experienced by vehicle Starting be intended to time, quick start engine.The electromotor of equipment start stop system needs Fraquent start, therefore resistance to starter Life-span has higher requirement for a long time.Produce about 600A electric current during starter work and can drag down the voltage of Full Vehicle System moment, send out The frequent starting of motivation adds the risk that the too low EMS/TCU of bringing of vehicle voltage is restarted.In order to preferably adapt to equipped with start-stop The automobile of system, needs a kind of relay circuit being simply easily achieved, is used for protecting starter.

Utility model content

The purpose of this utility model is to provide a kind of circuit, is applied to be equipped with on the automobile of start stop system, it is possible to effectively Protection starter, extend the starter life-span.

In order to achieve the above object, this utility model include ignition switch signal acquisition module, controller, metal-oxide-semiconductor module, Resistance R and starter M, power supply is connected with ignition switch, and ignition switch is connected with resistance R one end and metal-oxide-semiconductor module respectively, described Resistance R be connected with starter, described ignition switch signal acquisition module is transmitted after collecting the closure signal of ignition switch To controller, described controller is connected with metal-oxide-semiconductor module, and described metal-oxide-semiconductor module is in parallel with resistance R.

Described metal-oxide-semiconductor module at least includes two metal-oxide-semiconductors, parallel with one another between metal-oxide-semiconductor, the outfan input of controller To the grid of metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is connected between resistance R and ignition switch, source electrode be connected to resistance R and starter it Between.

Described controller is transferred to the grid of metal-oxide-semiconductor after driving module by boosting.

Described controller is single-chip microcomputer.

This utility model simple in construction, it is easy to accomplish, it is possible to protect the starter of the automobile equipped with start stop system, extend In the life-span of motivation, protect the power system of the automobile equipped with start stop system.

Accompanying drawing explanation

Fig. 1 is the prior art circuit about starter

Fig. 2 is the structured flowchart of protection circuit described in the utility model

Reference in figure is respectively as follows: 1. ignition switches；2 ignition switch signal acquisition module；3. controller；4. boosting Drive module；5. starter

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described further.

As Fig. 2 this utility model includes ignition switch signal acquisition module 2, controller 3, metal-oxide-semiconductor module, resistance R and rises Motivation 5, power supply is connected with ignition switch 1, and ignition switch 1 is connected with resistance R one end and metal-oxide-semiconductor module respectively, resistance R and starting Machine 5 connects, and ignition switch signal acquisition module 2 is transferred to controller 3, controller 3 after collecting the closure signal of ignition switch Being connected with metal-oxide-semiconductor module, metal-oxide-semiconductor module is in parallel with resistance R.Controller is single-chip microcomputer.After ignition switch K closes, about 20mS Electromagnetic switch main contacts close, start as timing, time delay period MOS power tube end, major loop via R to starter M powers；At the end of time delay, MOS power tube is fully on, and internal resistance is in parallel powers to motor for the conducting of R and metal-oxide-semiconductor.Single-chip microcomputer is main Complete control and the switch of power model gate-drive of delay command.The delay procedure of single-chip microcomputer uses existing open program It is capable of, does not elaborates.Q in figure is metal-oxide-semiconductor, is the ball bearing made figure of metal-oxide-semiconductor in figure.

Metal-oxide-semiconductor module at least includes two metal-oxide-semiconductors, parallel with one another between metal-oxide-semiconductor, the outfan input of controller to MOS The grid of pipe, the drain electrode of metal-oxide-semiconductor is connected between resistance R and ignition switch, and source electrode is connected between resistance R and starter.Single Sheet machine controls metal-oxide-semiconductor conducting after delay command, and single-chip microcomputer input controls signal to grid, controls metal-oxide-semiconductor conducting, metal-oxide-semiconductor Number is one or at least two, preferably 6 metal-oxide-semiconductors, and each metal-oxide-semiconductor is all in parallel with resistance R, and the motor of starter is powered, Now the overall internal resistance value of current-limiting relay controls, at below 1m Ω, the starting efficiency of starter to be effectively ensured.

Controller 3 is transferred to the grid of metal-oxide-semiconductor after driving module 4 by boosting.Owing to car load is in start-up course, system Magnitude of voltage can be dragged down by entirety.If metal-oxide-semiconductor gate voltage is relatively low, now metal-oxide-semiconductor is operated in variable resistance region, causes metal-oxide-semiconductor Conducting internal resistance value is big, reduces starter power；In the case of big electric current, the heat that metal-oxide-semiconductor results in greatly because of conducting internal resistance Affect and also result in metal-oxide-semiconductor under the operating characteristic of electronic devices and components, extreme case and burn；Therefore increase boosting and drive module 4, it is used for Promote gate drive voltage, it is ensured that metal-oxide-semiconductor can always work in constant current district.Boosting drives module to use the disclosure of prior art Circuit can realize boosting and the function driven, and does not drives the physical circuit of module to elaborate boosting.Use this Utility model is applied to be equipped with on the automobile of start stop system, it is to avoid produces instantaneous large-current and drags down car load during starter work The voltage of system, and then it is likely to result in the risk that car load EMS/TCU is restarted, it is possible to extend the starter life-span, effectively protect car load Power system.

Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that this utility model implements not by above-mentioned The restriction of mode, as long as have employed the improvement of the various unsubstantialities that technical solutions of the utility model are carried out, or the most improved general Design and the technical scheme of the present invention directly apply to other occasion, all within protection domain of the present utility model.

Claims (4)

1., for a circuit for automobile starter, including ignition switch (1), power supply and starter (5), described power supply passes through Ignition switch is connected with starter, it is characterised in that: described starter circuit also includes ignition switch signal acquisition module (2), controller (3), metal-oxide-semiconductor module and resistance R, between described ignition switch (1) and starter (5), resistance R and MOS is set Tube module, described ignition switch (1) is connected with resistance R, and described resistance R is connected with starter (5), described metal-oxide-semiconductor mould Block is in parallel with resistance R, and described ignition switch signal acquisition module (2) is transmitted after collecting the closure signal of ignition switch (1) To controller (3), described controller (3) is connected with metal-oxide-semiconductor module.

A kind of circuit for automobile starter, it is characterised in that: described metal-oxide-semiconductor module is extremely Include two metal-oxide-semiconductors less, parallel with one another between metal-oxide-semiconductor, the grid of the outfan input of controller to metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor Being connected between resistance R and ignition switch, source electrode is connected between resistance R and starter.

A kind of circuit for automobile starter, it is characterised in that: described controller (3) leads to Crossing boosting drives module (4) to be connected with the grid of metal-oxide-semiconductor.

A kind of circuit for automobile starter, it is characterised in that: described controller (3) is Single-chip microcomputer.