CN2101347U

CN2101347U - Automobile generator voltage regulator with short circuit propection

Info

Publication number: CN2101347U
Application number: CN 91224901
Authority: CN
Inventors: 牛忠; 唐卫华
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-09-09
Filing date: 1991-09-09
Publication date: 1992-04-08

Abstract

The utility model relates to an automobile generator voltage regulator with short circuit protection, comprising a voltage detecting part, a power drive part and an output part. Additionally a pulse short-circuit protection part is added. When the over-current in the load, the power output tube of the regulator is shutoff and endlessly generates detecting pulses to the load, until the load returns to normal, the regulator automatically recovers to the normal operation, so the burndown of components in the regulator because of the over-current of the load or the short circuit is avoided, and the service life of the utility model is prolonged.

Description

Automobile generator voltage regulator with short circuit propection

The utility model relates to a kind of automobile current generator voltage regulator, particularly a kind of electronic voltage controller that has short-circuit protection.

The CN88207419.9 patent application discloses a kind of " silicon rectification generator electronic voltage controller ", and it has solved, and the prior art resolution element is many, technical parameter is unstable, power consumption and bulky shortcoming.But as the adjuster of auto parts machinery, its condition of work is abominable, dustproof in order to improve, moistureproof, shockproof properties, and general transistor regulator mostly adopts the totally enclosed mode of polyester.In case yet outside line generation overcurrent or short circuit accident, the power tube of adjuster inside very easily burns out and can't repair, and applies thereby limited it widely.

The purpose of this utility model provides a kind of automotive generator electronic voltage modulator deficiency, have the self-protection function when overcurrent or short circuit appear in outside line that overcomes above-mentioned prior art.

This purpose can reach by following technical measures:

Similar with general automotive generator electronic voltage modulator, comprise current detection section, power drive and output.The improvement of being done is: increased a pulse short-circuit protection part.When load generation overcurrent, its power output tube ends and load is constantly produced the detection pulse, and after load restoration was normal, adjuster recovered operate as normal thereupon automatically.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is circuit theory diagrams of the present utility model.

Referring to accompanying drawing, adjuster is made up of current detection section, pulse short-circuit protection part, power drive and output:

1, current detection section:

Form by resistance R 1, R2, capacitor C 1, voltage stabilizing didoe DW and triode T1.The positive and negative electrode of R1, R2 series connection back and the battery feed composition bleeder circuit that joins wherein.Dividing point is that the negative pole of P, P point and DW joins.The positive pole of DW connects the base stage of T1, the grounded emitter of T1, and collector electrode connects the collector electrode of R3 one end and triode T2 and the base stage of triode T3.C1 is in parallel with the R2 two ends.

2, power drive and output:

The power drive part is made up of resistance R 3, R6, triode T3.Power output part is made up of resistance R 8, R9, triode T5, diode D3.

Wherein, R3 one termination power positive pole, the collector electrode of another termination T1 and T2 and the base stage of T3.The grounded emitter of T3 connects an end of base stage and the resistance R 8 of triode T5 behind its collector series resistance R6.Another termination positive source of R8.The emitter of T5 and diode D2 positive pole join, and connect positive source behind the series resistance R9 then.The current collection of T5 is power output pole very, i.e. F end, and the magnet exciting coil of it and generator joins.The negative pole of diode D3 connects its plus earth with the F end.

3, pulse short-circuit protection part:

By diode D1, D2, triode T2, T4, capacitor C 2, resistance R 4, R5, R7, R9 form.

Wherein, R9 one termination automobile storage battery positive pole and generator armature, the emitter of its another termination large power triode T5 and the while positive pole with diode D2 joins.Another utmost point of D2 joins with resistance R 5, R7 one end simultaneously.The base stage of another termination triode T4 of R5, the other end ground connection of R7.

The two ends of capacitor C 2 are in parallel with emitter, the collector electrode of triode T4.The emitter of T4 and the positive pole of storage battery join, and collector electrode connects with resistance R 4 one ends, the positive pole of another terminating diode of R4 D1, and the negative pole of D1 connects with the base stage of triode T2, and the collector electrode of T2 connects with the base stage of the base electrode of T1, T3, the grounded emitter of T2.

When energized, d point current potential was lower than regulated value when generator began to rotate, and P point current potential is lower than DW, the threshold voltage of T1, so T1 is in cut-off state, thereby T3, T5 conducting, F end output exciting current, generator output voltage raises gradually, be that d point current potential raises, when rising to the voltage-regulation value, P point current potential also is increased to the threshold voltage of DW, T1, so the T1 conducting.So, W point current potential step-down, T3, T5 end thereupon, and the F end is not exported exciting current, and generator voltage descends thereupon.When P point potential drop was following to the threshold voltage of DW, T1, T1 turn-offed again, and W point current potential raises, T3, T5 conducting, and the F end is exported exciting current again, and generator output voltage and then raises.Go round and begin again like this, generator voltage is stabilized in the scope of some settings.

When if the situation of overcurrent or short circuit takes place the F end, the electric current that then flows through R9, T5 increases, and the pressure drop that makes the R9 two ends is also along with increase, and the current potential that Q is ordered descends.When Q point potential drop when a certain set point, the T4 conducting, C2 discharges by T4, T2 conducting simultaneously, W point current potential reduces, T3, T5 turn-off, at this moment Q point current potential raises, T4 turn-offs thereupon, C2 charges by R4, D1, T2 and makes T2 continuation conducting.T3, T5 continue to end, and when C2 was charged to a certain value, T2 base stage no current flow through, and T2 just turn-offs, and make W point current potential raise T3, T5 conducting.Hold still overcurrent or short circuit as F this moment, and Q point current potential descends rapidly, and when being low to moderate a certain set point, the very fast conducting of T4 makes the C2 discharge, the T2 conducting, and T3, T5 turn-off.In this course, the ON time of T5 is very short.An of short duration pulse current promptly occurs, this pulse current is for T4 provides very fast disappearance behind the Continuity signal, is unlikely because of gathering of heat to burn large power triode T5.Go round and begin again, up to the electric current or the power cutoff of F end output prescribed limit value like this.

The utility model has the advantages that: owing to have pulse short circuit part, thus when outside line produces overcurrent or short circuit, can not burn the components and parts in the adjuster, have the self-protection function, thereby greatly improved the functional reliability of adjuster. Prolong service life, paved road for applying of electronic voltage controller.

Claims

1, a kind of automobile current generator voltage regulator, particularly a kind of electronic voltage controller that has a short-circuit protection, comprise current detection section, power drive and output; it is characterized in that pulse short-circuit protection part in addition; this part is by diode D1, D2; triode T2, T4; capacitor C 2; resistance R 4, R5, R7, R9 form, and its connecting mode is:

A, resistance R 9 one termination automobile storage battery positive pole and generator armatures.The emitter of its another termination large power triode T5 and the while positive pole with diode D2 joins, and another utmost point of D2 joins with resistance R 5, R7 one end simultaneously, the base stage of another termination triode T4 of R5, and the other end ground connection of R7,

The two ends of b, capacitor C 2 are in parallel with emitter, the collector electrode of triode T4, and the emitter of T4 and the positive pole of storage battery join, resistance R 4 of collector electrode series connection, and the base stage with T2 behind the diode D1 links,

The base stage of the negative pole of c, diode D1 and triode T2 is joined, and the base stage of the collector electrode of T2 and the collector electrode of T1, T3 is joined, the grounded emitter of T2.