CN2057045U - Voltage regulator for ac generator of car - Google Patents

Abstract

The utility model relates to a voltage regulator for the AC generator of cars. A power switch integrated package and peripheral elements are used to respectively compose a voltage regulation circuit and a charging protective circuit, and the voltage regulator uses the input terminal of the power switch integrated package and the high and low variation of the electrical level of a gating terminal, so the purposes of battery charging voltage regulation, short-circuit protection and over-charging prevention can be reached. The voltage regulator has the advantages of good switching characteristic, low temperature, high voltage regulation accuracy, small size, stable and reliable performance, automatic stopping charging when the battery is in full charge and automatic recovery of charging when the electricity is used. The utility model is suitable for the AC generators of various cars and the analogical AC generators used for internal-combustion engines.

Description

Voltage regulator for AC generator of car

The utility model belongs to a kind of device that is used for the Control of Automobile alternator voltage.

At present, automobile dynamo governor generally adopts transistor and integrated circuit, by transistorized conducting and by the control that realizes the generator excitation winding current, thereby reach the purpose of regulating charge in batteries voltage, but this type of adjuster is all taken a sample with voltage stabilizing didoe or is made reference voltage, and the switching characteristic of floating the die adjuster because of the temperature of voltage-stabiliser tube is poor, and power consumption is bigger, temperature rise, out of control easily or burn out in hot summer.General adjuster owing to there is little electric current constantly thereby the phenomenon of overcharging to occur to charge in batteries, makes that the electrolyte consumption of storage battery is bigger after battery is full of electricity, also corresponding shortening in its useful life, and in addition, this class adjuster does not all have short-circuit protection function.Short circuit accidentally burns out adjuster especially easily when installation, repairing, causes the damage of bulb and other electrical equipment, and is especially more outstanding on the car of 24V electric power system.

Task of the present utility model provides that a kind of switching characteristic is good, power consumption is little, temperature is low, temperature is floated little.Automobile alternator voltage regulator with anti-overcharge electricity and short-circuit protection function stable and reliable for performance.

Task of the present utility model is finished in the following way: adopt power switch integrated package and its peripheral cell to constitute voltage regulator circuit and overcharge of a battery protective circuit respectively.Utilize the operating characteristic of power switch integrated package; when the voltage of integrated package gating end is lower than its threshold voltage; when the voltage of input is higher than its threshold voltage; the integrated package conducting; if being higher than the voltage of threshold voltage or input, the voltage of gating end is lower than threshold voltage; integrated package all is in cut-off state, thereby plays the regulator generator output voltage, the effect of anti-overcharge electricity and short-circuit protection.

In conjunction with the accompanying drawings the utility model is further described:

Fig. 1-be the utility model circuit theory diagrams

As shown in the figure, power switch ic chip described in the utility model is TWH8752, by the power switch ic chip, and storage battery divider resistance R ₁, R ₂, transistor BG, resistance R ₄, R ₅Form voltage regulator circuit, the additives for overcharge protection circuit is by power switch ic chip, transistor BG, capacitor C ₁, C ₂, diode D ₁, D ₂, resistance R ₆, R ₇, R ₈Constitute.In the moment of Closing Switch K, storage battery is to C ₁Charging also has electric current through C ₁, D ₁To C ₂Charging makes C ₂Voltage rise, this moment, 1 pin voltage of ic chip was higher than threshold voltage, in this simultaneously, the voltage of storage battery is through R ₁, R ₂Be added in after the dividing potential drop and R ₁, R ₂The IC(2 that node is connected) on the pin (gating end), the voltage that is added in when battery tension is lower than its rated value on (2) pin is lower than its threshold voltage, the ic chip conducting.IC(4) pin (output stage) is through resistance R ₅Link to each other with the base stage of transistor BG, BG is conducting with the conducting of IC, and an end (F) of excitation winding is connected with the collector electrode of BG, and the other end is connected in battery terminal negative.Storage battery provides electric current to the generator excitation winding after the BG conducting, and engine rotation is promptly generated electricity, and with the rising of generator speed, generator output voltage is along with rising, and to charge in batteries.When charging voltage reaches rated value, being added in IC(2) voltage on the pin is higher than threshold voltage, and ic chip ends, and transistor BG also ends, and the electric current on the excitation group is through sustained diode ₃Afterflow, the output voltage that reduces generator along with the electric current of excitation winding reduces gradually, when being lower than the rated value of charge in batteries, being input to IC(2) voltage of pin is lower than threshold voltage, makes IC by by becoming conducting, and BG is also along with conducting, the electric current of excitation winding increases, generator output voltage rises, and so going round and beginning again is stabilized in the setting scope generator output voltage, reaches the purpose of regulating charge in batteries voltage.

Capacitor C in the additives for overcharge protection circuit described in the utility model ₁Positive pole is connected with battery positive voltage, and its negative pole one tunnel is through diode D ₁With capacitor C ₂Anodal linking to each other, another road is through R ₆Be connected capacitor C with excitation winding ₂Positive pole through resistance R ₇Be connected on (1) pin of IC, negative pole is connected on the battery terminal negative, during closed electric lock K switch, IC(1) voltage is higher than threshold voltage on the pin, and the voltage on (2) pin is lower than threshold voltage, the IC conducting, BG also is in conducting state, and electric current is through being connected in the diode D on the BG collector electrode ₂To C ₂Charging makes C ₂Often keep certain voltage, guaranteed IC(1) voltage on the pin is higher than threshold voltage, when storage battery just was full of electricity, its voltage had reached rated value, this moment the IC non-output signal, transistor BG ends, the electric current on the excitation winding is through D ₃Afterflow, (F) point voltage becomes negative, C ₁Pass through R ₆Discharge, C simultaneously ₂Pass through R ₇, R ₈Discharge is up to IC(1) voltage on the pin is lower than threshold voltage, and ic chip continues to end, and transistor BG also continues to turn-off, and storage battery can not provide electric current to excitation winding again, thereby the generator generation outage.Only the voltage of storage battery is lower than rated value behind automobile electrical, clicks electric horn again or enables other electric switch, a fluctuating current is just arranged through capacitor C on the circuit ₁, D ₁To C ₂Charging makes C ₂On voltage rise, ic chip is conducting again, storage battery recovers charging automatically, this protective circuit is particularly suitable for diesel vehicle, when travelling by day because of diesel vehicle, when just starting with electricity once, all the other few for a long time electricity consumptions.

The additives for overcharge protection circuit also has short-circuit protection function, and during the voltage regulator operate as normal, IC(2) voltage of pin is lower than threshold voltage, and the voltage of (1) pin is higher than threshold voltage, the IC output signal, and BG is in conducting state.If install or when repairing because of carelessness with conditioner outlet end (F) shorted to earth, the voltage of (F) is zero at this moment.C ₁Pass through R ₆Be discharged to zero, and C ₂Pass through R ₇, R ₈Discharge makes IC(1) pin voltage is lower than threshold voltage, and ic chip ends, and transistor BG turn-offs, and discharges up to short trouble, starts electric switch K or honks, and fluctuating current is just arranged through C on the circuit ₁, D ₁To C ₂Charge to and make the voltage of (1) pin be higher than threshold voltage, IC is by by transferring conducting to, and circuit recovers operate as normal, thereby plays the effect of self-protection.

This adjuster uses epoxy encapsulation in plastic casing, can moistureproof vibrationproof, because three kinds of functions described in the utility model are to realize by a power switch circuit TWH8752 or TWH8751, thereby circuit is simple, the reliability height, switching characteristic is good, and temperature is low, the voltage regulation accuracy height, volume is little.This adjuster shows that it is stable and reliable for performance through doing 20,000 2 thousand kilometers tests at east wind 141 diesel vehicles, start fast, car light sufficient brightness and do not burn bulb.Battery liquid consumption is few, has prolonged storage battery useful life and energy savings.

Claims (2)

1, a kind of automobile alternator voltage regulator of being made up of voltage regulator circuit is characterized in that also being provided with the overcharge of a battery protective circuit, and described voltage regulator circuit comprises storage battery dividing potential drop sample resistance R ₁, R ₂, power switch ic chip, transistor BG and resistance R ₄, R ₅, the gating end of power switch ic chip is connected in sample resistance R ₁, R ₂Between, its output links to each other with the base stage of transistor BG, and the collector electrode of BG is connected on the generator excitation winding.

2, voltage regulator according to claim 1 is characterized in that the overcharge of a battery protective circuit is by power switch ic chip, capacitor C ₁, C ₂, transistor BG, diode D ₁, D ₂, resistance R ₆, R ₇, R ₈Constitute, the input one tunnel of power switch ic chip is through resistance R ₇Be connected D ₁, D ₂Negative pole and capacitor C ₂Between the positive pole, another road is through resistance R ₈Link to each other capacitor C with battery terminal negative ₂Negative pole link to each other D with battery terminal negative ₂Positive pole link to each other capacitor C with the collector electrode of transistor BG ₁Positive pole be connected on the battery positive voltage, negative pole is connected diode D ₁Positive pole and resistance R ₆Between, R ₆The other end directly is connected on the excitation winding.