CN201150010Y

CN201150010Y - Voltage regulator for automobile

Info

Publication number: CN201150010Y
Application number: CNU2008200000247U
Authority: CN
Inventors: 张书郎
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-03
Filing date: 2008-01-03
Publication date: 2008-11-12
Anticipated expiration: 2018-01-03

Abstract

The utility model relates to a voltage regulator for the vehicle. A power supply drives a first field effect tube through monostable multi-resonant oscillating circuit, and the first field effect tube is used as the starting switch of a motor. The power supply is also connected with a high voltage warning circuit and a signal detecting comparative circuit, the high voltage warning circuit and the signal detecting comparative circuit respectively drive a second field effect tube, and the second field effect tube is the starting switch of a charge indicating lamp; the monostable multi-resonant oscillating circuit has an over-current protection function, and simultaneously controls the grid power level of the first field effect tube. The voltage regulator for the vehicle avoids the disadvantages of the transistor circuit, and the cost is reduced, the volume is reduced, the field effect tube switching circuit is adopted, the functions of voltage adjustment, over-current protection, high voltage warning and soft start are integrated into a whole, and the whole reliability of the device is improved.

Description

Voltage regulator for automobile

Technical field

The utility model belongs to voltage regulating device, relates in particular to a kind of voltage regulator of automobile current generator.

Background technology

At present, voltage regulator for automobile on the market mainly contains two kinds: a kind of adjuster that is to use transistor circuit, and it has the function of regulation voltage and overcurrent protection; but volume is big; and circuit board mostly is aluminium base or epoxy substrate, and its insulating properties and heat sinking function are not strong, reduces reliability of products.Another kind is to use the adjuster of single chip circuit, mostly is the foreign capitals product, and domestic also do not have an independent development, costs an arm and a leg.

Summary of the invention

Big in order to overcome existing solid-state regulator volume, the shortcoming of function singleness and poor reliability the utility model proposes a kind of automobile-used single adjuster, and it integrates the function of regulation voltage, overcurrent protection, alarm for high voltage, soft start.

For this reason, the technical solution of the utility model is: voltage regulator for automobile, has accumulator jar voltage detection terminal (S), generator output end (B+), generator loading terminal (F), generator speed input terminal (P), charging indicator light splicing ear (L), ignition switch splicing ear (IG), earth terminal (E), it is characterized in that: generator output end (B+) is by first electric resistance partial pressure branch road and the voltage stabilizing didoe, first comparator (U1), the monostable multiplex circuit that second comparator (U2) and auxiliary circuit are formed connects, the output of monostable multiplex circuit is connected with the grid (G) of first field effect transistor, and the drain electrode of first field effect transistor (D) is connected with generator loading terminal (F); Accumulator jar voltage detection terminal (S), ignition switch splicing ear (IG) also are connected with monostable multiplex circuit; Accumulator jar voltage detection terminal (S), ignition switch splicing ear (IG) also are connected with two inputs of the 3rd comparator (U3) by the second electric resistance partial pressure branch road, the 3rd electric resistance partial pressure branch road respectively, the output of the 3rd comparator (U3) is connected with the grid (G) of second field effect transistor, be connected with first backward diode between accumulator jar voltage detection terminal (S) and the 3rd comparator (U3), the drain electrode of second field effect transistor (D) is connected with charging indicator light splicing ear (L); Ignition switch splicing ear (IG) is connected with the input of the 4th comparator (U4) by the 4th electric resistance partial pressure branch road, another input of the input of the 4th comparator (U4) is connected with a node of the 3rd electric resistance partial pressure branch road, the output of the 4th comparator (U4) is connected with generator speed input terminal (P) by resistance, second backward diode, and the output of the 4th comparator (U4) also directly is connected with the input of the 3rd comparator (U3); The source electrode (S) of the source electrode of first field effect transistor (S), second field effect transistor is connected with earth terminal (E).

To improvement of the technical scheme, this voltage regulator for automobile is to adopt ceramic substrate, and integrated circuit, electronic component are mounted on the ceramic substrate.

Beneficial effect: the shortcoming that this automobile-used voltage regulator adopts cheap integrated circuit and electronic component to avoid transistor circuit; and reduced cost; reduced volume; adopt FET switch circuit; the function that integrates regulation voltage, overcurrent protection, alarm for high voltage, soft start has improved the reliability of whole device.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Describe the circuit of voltage regulator for automobile in conjunction with Fig. 1, power supply drives first field effect transistor by monostable multiplex circuit, and first field effect transistor is as the starting switch of generator.Power supply also is connected with alarm for high voltage circuit, input comparison circuit, and alarm for high voltage circuit, input comparison circuit drive second field effect transistor respectively, and second field effect transistor is the starting switch of charging indicator light.Monostable multiplex circuit plays the effect of overcurrent protection, controls the grid level of first field effect transistor simultaneously.

The circuit of describing voltage regulator for automobile in conjunction with Fig. 2 is as follows: B+ is output voltage 12V, obtains 3.4V through R1 and R2 dividing potential drop and delivers to U1:C-6 pin and 7 pin relatively.7 pin current potentials depend on voltage-stabiliser tube D1, are 4.7V, thereby 1 pin is output as high potential, the TI conducting, and at this moment B+ forms the loop through magnet exciting coil one F-T 1-R5-ground, and generator begins because exciting current has been arranged to generate electricity.B+ voltage constantly raises, storage battery begins charging, when B+ voltage begins to be higher than 14.5V, when being higher than 4.7V, R1 and R2 dividing potential drop deliver to U1:C-6 pin and 7 pin relatively, 1 pin is an electronegative potential, and TI ends, and has disconnected the path of exciting current, generator is because of the excitation-free current generation outage, and at this moment storage battery begins discharge.B+ voltage reduces gradually, when B+ voltage is reduced to when being lower than 14.5V, can make the U1 upset again, and generator excitation circuit is connected in the TI conducting, repeats the beginning process, makes B+ voltage basicly stable about 14.5V.Play the function of regulation voltage burning voltage output.

When the generator normal power generation, the TI electric current is not higher than 4A in Fig. 1, and the U1:C-14 pin is a high potential, when the TI electric current is higher than 5A, makes R5 voltage surpass R8 voltage, the U1:C upset, and 14 pin are electronegative potential, thereby make the U1:A upset.1 pin electronegative potential ends T1, has disconnected the exciting current of generator, and the effect of overcurrent protection is played in the generator generation outage.

When opening ignition switch during the unstart machine, because B+ has only 12V, TI is in the saturation conduction state in Fig. 1; electric current＞4A; generator loading is remarkable, is unfavorable for engine start, at this moment by UI:A; U1:c and TI form an one-shot multivibrator; produce a prescription ripple, the TI average current is dropped to below the 1A, both reduced the engine start load; the function that protection T1 is arranged again, promptly so-called soft start function.

The U1:D-11 pin is got fixed voltage 5.5V in Fig. 1, and 10 pin are the B+ sampling voltage, obtains 4.7V by R14 and R15 dividing potential drop, and 13 pin and U 1:B-4 pin are high potential, 2 pin electronegative potentials, and T2 ends, and rechargeable lamp does not work.When B+ was higher than 17V, U1:D-10 pin voltage was higher than 11 pin, and 13 pin and 4 pin all are electronegative potential, and 2 pin are high potential, the T2 conducting, and rechargeable lamp is bright, sends the alarm for high voltage warning.

In Fig. 1 because R12 and R13 dividing potential drop, make the D3 negative pole obtain 8V voltage, be higher than positive pole (7V), D3 ends, when S and storage battery disconnection, the D3 conducting, R13 (3K) is connected in parallel on R7 and R8 two ends, makes the voltage of U1:B-4 pin drop to 4.8V, the U1:B upset, 2 pin uprise current potential, the T2 conducting, and rechargeable lamp is bright to give a warning.

In Fig. 1, open and during the engine unstart when ignition switch, the P no-voltage, at this moment the U1:B-4 pin is an electronegative potential, 2 pin are high potential, the T2 conducting, charging indicator light is luminous.When the engine start generator began to generate electricity, P had 7V voltage and delivers to the U1:B-4 pin through the D5 halfwave rectifier, and 2 pin become electronegative potential, and T2 ends, and charging indicator light extinguishes.

Voltage regulator as shown in Figure 2 links to each other common integrated circuit with electronic original part, electronic original part is mounted on the ceramic substrate again, by adhesive ceramic substrate is sticked on the adjuster heat-dissipating casing then, the effect of reach insulating radiation, regulating voltage stabilizing.

Claims

1, voltage regulator for automobile, has accumulator jar voltage detection terminal (S), generator output end (B+), generator loading terminal (F), generator speed input terminal (P), charging indicator light splicing ear (L), ignition switch splicing ear (IG), earth terminal (E), it is characterized in that: generator output end (B+) is by first electric resistance partial pressure branch road and the voltage stabilizing didoe, first comparator (U1), the monostable multiplex circuit that second comparator (U2) and auxiliary circuit are formed connects, the output of monostable multiplex circuit is connected with the grid (G) of first field effect transistor, and the drain electrode of first field effect transistor (D) is connected with generator loading terminal (F); Accumulator jar voltage detection terminal (S), ignition switch splicing ear (IG) also are connected with monostable multiplex circuit; Accumulator jar voltage detection terminal (S), ignition switch splicing ear (IG) also are connected with two inputs of the 3rd comparator (U3) by the second electric resistance partial pressure branch road, the 3rd electric resistance partial pressure branch road respectively, the output of the 3rd comparator (U3) is connected with the grid (G) of second field effect transistor, be connected with first backward diode between accumulator jar voltage detection terminal (S) and the 3rd comparator (U3), the drain electrode of second field effect transistor (D) is connected with charging indicator light splicing ear (L); Ignition switch splicing ear (IG) is connected with the input of the 4th comparator (U 4) by the 4th electric resistance partial pressure branch road, another input of the input of the 4th comparator (U4) is connected with a node of the 3rd electric resistance partial pressure branch road, the output of the 4th comparator (U4) is connected with generator speed input terminal (P) by resistance, second backward diode, and the output of the 4th comparator (U4) also directly is connected with the input of the 3rd comparator (U3); The source electrode (S) of the source electrode of first field effect transistor (S), second field effect transistor is connected with earth terminal (E).

2, voltage regulator for automobile according to claim 1 is characterized in that: described voltage regulator for automobile is to adopt ceramic substrate, and integrated circuit, electronic component are mounted on the ceramic substrate.