CN2140318Y - Light stabilizer of small tractor and farm tricycle - Google Patents

Abstract

The utility model relates to a light stabilizer for small tractors and farm tricycles, which is composed of a diode D[1], a voltage stabilizing diode D[2], a bidirectional thyristor G, resistors, R[1], R[2] and R[3], a capacitor C, etc. The light stabilizer for small tractors and farm tricycles is characterized in that a generator winding adopts parallel connection to ensure that lamps have enough brightness when a tractor runs at low speed; the series loop of the diode D[1], the voltage stabilizing diode D[2] and the resistor R[1] and R[2] forms into a voltage stabilizing circuit; the resistor R[3] provides trigger current for the bidirectional thyristor G to make the bidirectional thyristor conducted to work when the tractor runs at high speed and the generator voltage is over high; one part of current is made to be absorbed by the light stabilizer so as to ensure that the lamps can normally work when high voltage.

Description

Light stabilizer of small tractor and farm tricycle

The utility model relates to a kind of light light stabilizer in the agricultural machinery field, especially for compact tractor and agricultural tricycle.

The vehicle light power supply that existing farm tractor and three-wheel vehicle are used is from three permanent magnetism winding generators on the flywheel, and the connection of its three phase winding is a wye connection, and lighting car light all adopts the two-phase winding power supply at present, and its electric power system is seen Fig. 1.(in the drawings, the 5th, car light, 6 is three phase windings).Owing to be subjected to present traffic route condition restriction, exercise on rough highway or meeting or can only low speed driving when turning when vehicle night, because this moment, the flywheel rotating speed was slow, the voltage that electrical generator sends is on the low side, motor illuminance is very poor, cause operation quality poor, safety is also poor, for improving car light brightness, has only open the throttle wide, reduce the speed of a motor vehicle, the waste of troublesome poeration and oil plant is big like this, environmental pollution also aggravates, and when high vehicle speeds, owing to flywheel faster rotational speed this moment, then electrical generator sends the voltage rising, can exceed the car light rated voltage, often cause the bulb burnout failure, at above-mentioned design-calculated shortcoming, someone has proposed many improvement projects, as application number is 89201126.2 patent applications about " low-speed tractor efficient illumination device ", though solved the lighting problem that low-speed tractor travels, circuit structure complexity, manufacturing cost is higher, and for example application number is 88105333.3 the patent application about " lighting device for low-speed tractor ", though also solved the low speed lighting problem, circuit structure is comparatively simple, but also exist when running at high speed the problem that car light burns easily equally when output voltage uprises with the former.

The purpose of this utility model is at present compact tractor and the unsettled shortcoming of agricultural tricycle lighting voltage and a kind of lamp dimmer of design-calculated, it can solve the problem of trac. or three-wheel vehicle illuminance difference when low speed driving, can solve its overtension when running at high speed again, the problem of burning car light easily.

Technical solution of the present utility model is as follows, elaborates below in conjunction with accompanying drawing.

Fig. 2 is outline packages figure of the present utility model, two binding posts 1 and 2 insert the fin 7 that has some projectioies between the mouth of generator windings and the ground at the middle part of housing respectively on the housing, to improve radiating effect, have a mounting hole at its two end, to be fixed.Fig. 3 is the connection diagram of the utility model and car light and generator windings, their common electric power systems of forming, owing to adopt the utility model to insert electric power system, now change former generator windings 3 into parallel connection method in succession by the Y type, electrical generator becomes three power supplies linked together by single phase power supply like this, vector superposition relation according to three phasevoltage, then power supply voltage will be brought up to original 3 times, but, do not divide equally trac. three phase windings around full whole garden week because not being three-phase, so output voltage is less than 3 times, but will greatly improve than single phase power supply, so just be equivalent to improve the flywheel rotating speed of trac., (be roughly equal to and improve the last 1/3) also is that trac. is when low speed driving, generator output voltage improves, so vehicle light illumination improves, two car lights 4 and the utility model are taked parallel connection method, by lighting switch K ₂Insert the mouth of generator windings 3, two binding posts, 1 termination of the present utility model is gone into K ₂Mouth, 2 end ground connection, Fig. 4 is an electrical schematic diagram of the present utility model, diode D ₁Positive pole insert binding post 1, negative pole series resistor R ₁With zener diode D ₂And R ₂R ₃A termination go into R ₂With diode D ₂The contact that links to each other, the trigger control end of another termination triac G, chemical capacitor C and R ₂Insert resistance R after the parallel connection again _LBe connected to binding post 2, other of triac two ends, a termination is gone into binding post 1, and the other end is connected to R _LAnd R ₂The contact that links to each other.

Working process of the present utility model is as follows: when trac. travelled at a slow speed, because generator windings adopts parallel connection method, this moment, output voltage itself was higher, and vehicle light illumination is higher, can satisfy the operation needs fully, by the diode D of the certain voltage stabilizing value of suitable selection ₂, making at this moment, generator output voltage is lower than diode D ₂Conducting-state voltage, diode D ₂End, triac G trigger electrode triggerless electric current and ending, the utility model is not worked.When trac. was run at high speed, this moment, generator output voltage was higher, when being higher than zener diode D ₂Conducting-state voltage the time, zener diode D then ₂R is passed through in conducting ₁And R ₂Two electric resistance partial pressures are at R ₂The pressure drop of last generation is to R ₃Power supply, the trigger electrode of triac G gets electric and makes its conducting at this moment.Because the conducting resistance of triac G is very little, for making its unlikely burning, has sealed in current-limiting resistance R in circuit _L, make it can produce bigger conducting electric current and unlikely burning.Because the utility model is attempted by on two car lights, so shunting action has been played in its conducting, the electric current of the car light 4 of flowing through like this is unlikely excessive, and makes its energy normal operation.

After the utility model has the advantages that it incorporates car light into, can send motor three phase windings elsewhere is parallel connection method by wye connection, having improved power supply voltage makes it can be when low-speed tractor travels, car light energy normal operation, again since two-way for silicon be that car light has improved bigger by-pass current, car light also can normal operation when trac. was run at high speed, thereby the shortcoming of vehicle light illumination voltage instability when having solved the trac. night running, and the utility model is simple in structure, cost is lower, has higher utility.

Claims (2)

1, a kind of compact tractor and agricultural tricycle lamp light stabilizer are by diode D ₁, zener diode D ₂, triac G and resistance R ₁, R ₂, R ₃With composition such as electrolytic condenser C, it is characterized in that it and car light 4 and meet diode D ₁Positive pole and binding post 1 join negative pole and R ₁And zener diode D ₂And R ₂Join resistance R ₃One termination R ₂, the trigger electrode of another termination triac G, chemical capacitor C and R ₂Back in parallel and R ₁Join R ₁Another termination binding post 2, the termination binding post 1 of triac G, the other end and R ₁Join.

2, the light stabilizer according to claim 1 is characterized in that three phase windings of the electrical generator that joins with this light stabilizer are used parallel connection method instead by Y connection.

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