JPS5854842A - Generator regulator for electronic vehicle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic automotive generator regulator for use in an automobile.

FIG. 1 shows a regulator conventionally used in automobiles. In the figure, 1 is an alternator, and this alternator 1 includes a generator 2, a rectifier 3, a field winding 4, and the like. A battery 5 and a variable load 6 are connected in parallel between the battery terminal B and the ground terminal G, and an ignition key switch 7 and a charge warning lamp 8 are connected between the battery terminal B and the lamp terminal. are connected in series. 9 is a regulator, and this regulator 9 is a transistor Q1 to QC1 and a resistor R1.
-R5, capacitor C15C1, Zener diode Z
D and diode D, terminal F is field winding +w
4, the terminal L1 is connected to the other ends of the lamp terminal L1 rectifier 3 and the field winding 4, and the terminal q' is connected to the ground terminal G, respectively. In which circuit regulator 9
The output voltage of the generator 2 is controlled by controlling the on/off of the transistor Q1 to change the current flowing through the field winding 4 according to the control voltage of the regulator.

Here, the control voltage vREG in the regulator 9
C. The voltage between the base and emitter of transistor Q3 is VB.
li13, set the Zener voltage of Zener diode ZD to V
Z%) The pace current of transistor Q3 is ll13, and the current flowing through resistor Rx #R3 is IR2, IR3.
Then, it can be expressed as the following equation.

ViIl+a=Vtgs +Vz +Rt (ll1A
+IR2+ IIL5) - (1) Here, when the load 6 is small, the duty to turn on the transistor Q10 is small and the duty to turn on the transistor Qs is large, so the voltage of the battery 5 is controlled to a voltage approximately equal to the above equation (1). be done. However, when the load 6 used becomes larger, the duty period during which the transistor Q1 is turned on increases and the duty period during which the transistor Q3 is turned on becomes smaller, so that the average value of the base current IB3 becomes smaller. As a result, (1
) product of voltage detection resistor R1 and base current IB5 (R
The battery voltage is controlled to a lower value by the amount that tXlB5:l becomes smaller. In other words, in the above circuit, the control voltage fluctuates depending on the magnitude of the load 60, making it difficult to obtain a constant generator output.

The present invention was developed in order to eliminate the above-mentioned drawbacks.
An electronic car generator that can reduce control voltage fluctuations in response to load fluctuations by using a bipolar IC (integrated circuit) with a built-in current amplifier and a circuit configuration that increases the input impedance of the voltage detection section. The purpose is to provide regulators.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The regulator shown in FIG. 2 is also used in automobiles as described above, and the same reference numerals are used for the same parts as in FIG. 1. That is, alternator 1, generator 2, rectifier 3
, the field windings are provided in the same manner as in the circuit shown in FIG. 1, and the terminals D, F, and G' of the regulator 9 are also connected in the same manner as described above. Further, in the regulator 9, C, an output transistor Q1 whose collector and emitter are connected between terminals FG', a transistor Q2 which is Darlington connected to this transistor Q1, and a transistor Q2 which is connected between terminals FD in accordance with the illustrated polarity. A voltage detection resistor R1 and a resistor R8 are connected in series between the diode 1 terminal DG' and a resistor R4 is connected between the pace and the terminal of the transistor Q2.
It includes a one-chip bipolar IC 10 including a current amplifier. A resistor R6 is connected between the terminal 2 of the /4 Ipolar IC 10 and the terminal 1 of the regulator 9. The above-mentioned Ipolar ICl0 compares the reference voltage of the constant power supply 11 with the voltage detected by the voltage detection resistor R0, and when the detected voltage becomes larger than the reference voltage by υ, the comparison output is sent to the 5-output comparator 12 and this It has a current amplifier 13 for amplifying the output of the controller 12, and a drive transistor Q3 driven by the output of the amplifier 13 to drive the transistors Q1 and Qg.

Also in the regulator 9, the control voltage v
RIiIG can be expressed by formula (1). However, it is assumed that the Zener voltage vz corresponds to the reference voltage. now,
The output voltage of the generator 2 is detected by the resistors R1 and R3, and the detected voltage (midpoint voltage between R1 and R1) is detected by the detection resistor R1.
When becomes higher than the reference voltage, the comparator 10 outputs a comparison output, and the amplifier 13 increases the pace current IBM supplied to the drive transistor Q3. As a result, transistor Q3 turns on, and transistors Q1 and Q+a turn off due to the on operation of transistor Qs, so that the electric current 6ft' flowing from field winding 4 through transistor Q1 becomes zero, and the output voltage of generator 2 becomes zero. will also decrease. Next, when the output voltage decreases too much, the voltage detected by the resistor R1 drops below the reference voltage, so the output of the converter Al converter 10 becomes zero. As a result, transistor Qa is turned off, transistors Ql and Qll are turned on, and field winding 4 is turned off.
Since the current is supplied to the generator 2, the output voltage of the generator 2 increases.

By repeating this process repeatedly, the average value of the output voltage of the generator 2 is kept constant, but the load...
When lf6 is small, the on-duty of the transistor Qs is large and the on-duty of the output transistor Ql is small, so the current supplied to the field winding 4 is small, the output voltage is also reduced, and the voltage of the battery 5 is 1)
The voltage is controlled to be approximately equal to the equation. Conversely, when the load 6 is large, the on-duty of the output transistor Q1 is large and the on-duty of the transistor Qs is small, so
If the current supplied to the field winding 4 is large, the output voltage will be increased.

In this case, since the base current 1.3 of the transistor Qs is greatly amplified, its average value is approximately the same as that when the load is small. Therefore, the detection resistor Rx and pace current IB5 in equation (1) above Product [:Rt X I
BM) is small and not A. As a result, the voltage of the battery 5 is controlled to be approximately equal to the equation (1) above.

The above circuit can obtain a substantially constant control voltage regardless of the size of the load, thereby making it possible to keep the output voltage of the generator 2 constant, making it a 1/guulator with excellent characteristics against load fluctuations. be able to.

As explained above, according to the present invention, by using a bipolar IC with a built-in current amplifier and creating a circuit configuration that increases the input impedance of the voltage detection output section, fluctuations in the control voltage can be reduced in response to fluctuations in the load. By this, it is possible to maintain the output voltage of the generator substantially constant, and to provide an electronic automobile generator regulator with excellent load fluctuation characteristics.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional electronic motor vehicle generator regulator, and FIG. 2 is a circuit diagram of an electronic motor vehicle generator regulator according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Alternator, 2... Generator, 3... Rectifier, 4... Field winding, 5... Battery, 6... Load, 7... Ignition key switch, 8... ...Charge II) Awning lamp, 9...Regulator, 10...Bipolar IC, 11...Constant power supply, 12
...Comparator, 13...Current amplifier, R1a
R1...Voltage detection resistor, Ql...Output transistor, Q3...Drive transistor, R4lR6...Resistor, D...Diode. Applicant's agent Patent attorney Takehiko Suzue 9-

Claims (1)

[Claims] An electronic automobile generator regulator that controls the output voltage of the generator to be kept constant against load fluctuations, comprising a voltage detection means for detecting the output voltage of the generator, a means for generating a reference voltage, and a voltage detection means for detecting the output voltage of the generator; A single chip incorporating a comparison means for comparing a reference voltage and a detection voltage detected by the detection means, a current amplification means for amplifying the output of the comparison means, and a drive transistor driven by the current amplification means. The device includes a bipolar IC and an output transistor that turns on and off by turning on and off a drive transistor of the bipolar IC to control the current supplied to the field winding of the generator, and the bipolar IC controls the input of the voltage detection means. An electronic automobile generator regulator characterized in that the output voltage of the generator is held constant by increasing impedance and reducing fluctuations in the control voltage of the regulator in response to load fluctuations.