JPH0728560B2 - Vehicle power generation control device - Google Patents

Description

The present invention relates to a vehicular power generation control device for controlling the output voltage of a generator mounted on, for example, an automobile with a microcomputer.

[Conventional technology]

In order to control the fuel injection of the engine installed in the vehicle,
Microcomputers are often used. And
By using such a microcomputer, not only the above-mentioned fuel injection control but also centralized control of other electric devices tends to be performed.

The vehicle is equipped with an AC generator that is rotationally driven by the engine in order to operate not only the engine control but also various other electric devices. In order to control the amount of power generation, such an alternator is equipped with a power generation control device that adjusts the power generator output by controlling the exciting current flowing in the exciting winding wound around the rotor using a power transistor element. The power generation control device is controlled by detecting the charging voltage of the vehicle storage battery, for example. That is, in order to detect the charge / discharge state of the storage battery and control the power generation amount of the generator, the generator output is controlled by controlling the exciting current flowing in the exciting winding wound around the rotor by using the power transistor element. The power generation control device for adjusting is provided, and the power generation control device is controlled by, for example, detecting the charging voltage of the vehicle storage battery. That is,
This is to detect the charging / discharging state of the storage battery and adjust the amount of power generated by the generator. Control of the power generation state of such a generator is effectively replaced by a microcomputer, which enables precise control. Various controls are possible.

[Problems to be Solved by the Invention]

In the future, when trying to control the amount of power generation of this type of alternator using a microcomputer, it is within the normal technological advancement that the exciting current circuit connected to the exciting winding of the generator is It is usual to extend to the main body of the microcomputer and control the on / off control of the exciting current to the exciting winding by the microcomputer.

However, when an exciting current circuit is provided between the exciting winding and the control unit that supplies the exciting current to this winding, the current flowing in the exciting winding causes the current flowing through the exciting winding to drop due to the wiring voltage drop by the exciting current circuit. Is lower than that of self-control. In particular, when a generator is controlled using a microcomputer, this type of wiring drop is a major problem because it enables highly accurate power generation control at both the time and the charge level. The generator output is smaller than that of the conventional generator.

In addition, a relatively large electromagnetic noise is likely to occur due to the passage of a long current with a large current containing an intermittent high-frequency component flowing between the excitation winding, the power transistor element, and the freewheeling diode, which may cause malfunction of the microcomputer. Cause.

The present invention has been made in view of the above points, and is a vehicle having a simple structure in which the influence of electromagnetic noise can be minimized and an optimum power generation state can be controlled according to a signal from a microcomputer. It is an object of the present invention to provide a power generation control device for use.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a switching power transistor element which is provided in a holding container incorporated in a vehicle AC generator for charging an on-vehicle storage battery and which is connected in series to an exciting winding of the generator. A microcomputer that is arranged apart from the generator and that outputs a switching signal that controls opening and closing of the power transistor element for adjusting the voltage of the storage battery to a desired value; and the microcomputer incorporated in the generator. A power transistor element and a microcomputer provided apart from the generator, the signal transistor supplying the switching signal of the microcomputer to the power transistor element, and the power transistor element, , As a semiconductor element integrated with the return diode of the excitation winding A power generation control device for a vehicle is provided.

[Operation and effect of the invention]

According to the above configuration, since the generator and the microcomputer are arranged apart from each other, the temperature caused by the mounting position of the generator,
It is possible to prevent the microcomputer from being damaged by the influence of vibration or the like.

Further, according to the configuration in which the power transistor element and the free wheeling diode are provided on the microcomputer side and the power transistor element and the excitation winding on the generator side are connected by the signal supply means, the signal transmitted by the signal supply means is the power transistor and A large current including an intermittent high frequency component flowing through the freewheeling diode causes a large electromagnetic noise, but according to the present invention, since the signal transmitted by the signal supply means is a minute switching signal, the signal supply means The generation of large electromagnetic noise is prevented, and since the power transistor element and the free wheeling diode are configured as an integrated semiconductor element, the lead wire of the free wheeling diode can be eliminated and the wiring inductance can be reduced. And the antenna-like action can be reduced,
Electromagnetic noise in this portion can be suppressed. As a result, malfunction of the microcomputer can be effectively prevented, and noise of the radio and audio equipment can be reduced.

Further, since the power transistor element and the free wheeling diode are integrated semiconductor elements, and the heat generation timings of the two are shifted, the heat radiating means can be effectively used, and a compact and simple structure can be achieved. Is also suitable.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the circuit configuration of this power generation control device. The generator main body 11 includes a three-phase stator winding 12 and a rotor excitation winding 13, and the power generation output from the stator winding 12 is a rectifying device.
It is rectified at 14, taken out from the output terminal 15, and supplied to the storage battery 16 as a charging current. Reference numeral 17 is a load of an electric device for a vehicle which uses the storage battery 16 as a power source.

The generator main body 11 is also provided with an exciting current control circuit 18 that forms an exciting current circuit that forms an exciting current circuit together with the exciting winding 13. As shown in FIG. 2, the control circuit 18 is composed of a semiconductor switch element 19 in which a power transistor 19a and a free wheeling diode element 19b are integrally combined, and the semiconductor switch element 19 is attached to a radiation fin 20.

Then, the semiconductor switch element 19 including this heat radiation fin 20
Is disposed and housed in a holding container 22 formed integrally with the brush holder 21 as shown in FIG. This brush holder 21
Is provided in a portion close to the rotating shaft on the outside of the generator case that houses the generator main body 11, and is located close to the rotor excitation winding 13 incorporated in this case. In this case, the brush holder 21 is further provided with another holding container 23, in which a radio wave interference preventing capacitor 24 is set.

Here, the radiation fin 20 integrated with the semiconductor switch element 19
However, if it is set so as to be exposed on the outer surface of the holding container 22,
The semiconductor switch element 19 is cooled effectively.

An input signal terminal 25 is also provided integrally with the brush holder 21, and the terminal 25 is connected to a microcomputer unit (not shown) arranged outside the generator body 11. This microcomputer unit supplies the terminal 25 with a control command signal for switching drive for controlling an exciting current for controlling the amount of power generation. In addition, terminal plates 26a to 26d are insert-molded on the brush holder 21, and are collectively soldered to the semiconductor switch element 19 and the capacitor 24 at the head of the brush holder 21. There is. 27a and 27b are brushes, and the brush holder 21 is attached so that the brushes 27a and 27b come into contact with the slip ring portion provided on the rotating shaft, and the excitation winding 13 is connected to this slip ring. To be done.

That is, when a control signal is applied to the input signal terminal 25 of the brush holder 21 from a control circuit such as a microcomputer external to the generator, the power transistor 19a of the semiconductor element 19 is on-off controlled by the control signal and excited. The grounding circuit of the winding 13 is turned on / off to variably control the exciting current. Where the power transistor 19
When a is turned off, the exciting current energized by the inductance of the exciting winding 13 is configured integrally with the power transistor 19a and short-circuited by the adjacent diode element 19b to prevent the occurrence of spark. 19b acts as a freewheeling diode.

In addition, the exciting current control circuit 18 is as shown in FIG.
It is shown as a semiconductor device having an NPN junction transistor function section. However, as shown in FIGS. 4 (A) and 4 (B), if the power transistor circuit is formed of a composite semiconductor in which so-called two transistors 19a and 19c are Darlington-connected, a semiconductor switching device having a larger capacity can be obtained. Can be configured.

FIG. 5 shows a circuit diagram when the generator circuit is of the diode trio excitation type. The same parts as those in FIG. 1 are designated by the same reference numerals and their explanations are omitted. In series with winding 13,
The case where the exciting current control circuit 18 is provided on the downstream side where the current flows from the exciting winding is shown. However, as shown in FIG. 6, on the upstream side of the exciting current to the exciting winding 13, the exciting current control circuit by the semiconductor switch element 19 as described above is provided.
Of course, 18 may be provided. Further, the semiconductor switching element is not limited to the NPN junction as shown in the embodiment, and it goes without saying that it may be a PNP junction.

[Brief description of drawings]

FIG. 1 is a circuit diagram illustrating a power generation control device according to an embodiment of the present invention, FIG. 2A is a diagram showing a configuration of a semiconductor switch element used in the above device, and FIG. Is a circuit diagram, FIGS. 3 (A) and 3 (B) are front and side views showing a brush holder incorporating the semiconductor switch element, and FIG. 4 (A) is another example of the semiconductor switch element. FIG. 6B is a circuit diagram, FIG. 5 and FIG.
Each of the drawings is a circuit diagram for explaining another embodiment of the present invention. 11 ... Generator main body, 12 ... Stator winding, 13 ... Excitation winding, 18 ... Excitation current control circuit, 19 ... Semiconductor switch element, 19a ... Power transistor, 19b ... Return diode, 21 …… Brush holder.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H02K 19/36 7254-5H (72) Inventor Masanori Maruyama 1-chome, Showa-cho, Kariya city, Aichi Japan (56) References JP-A-56-3539 (JP, A) JP-A-57-22338 (JP, A) JP-A-55-61265 (JP, A) JP-A-51-54375 ( JP, A) JP 55-59769 (JP, A)

Claims (2)

[Claims] 1. A switching power transistor element, which is provided in a holding container built in a vehicle AC generator for charging an in-vehicle storage battery, and which is connected in series to an exciting winding of the generator, and is separated from the generator. Arranged to adjust the voltage of the storage battery to a desired value, the microcomputer outputting a switching signal for controlling the opening and closing of the power transistor element; the power transistor element built in the generator; And a signal supply means for supplying the switching signal of the microcomputer to the power transistor element, the power transistor element being a freewheel of the excitation winding. It is configured as an integrated semiconductor element together with a diode for That vehicle power generation controller. 2. The power generation control device for a vehicle according to claim 1, wherein the holding container is configured as a part of a brush holder of the generator.