JPS6159079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alternating current generator, and in particular to an alternating current generator with a non-contact type regulator equipped with an excitation diode for supplying current to a field coil, suitable for use in vehicles such as automobiles. Concerning improvements to generators.

Conventionally, automotive alternators (hereinafter referred to as alternators) have used contact type regulators that mechanically interrupt the field current of the alternator using contacts to maintain a constant voltage generated by the alternator, but in recent years, hybrid regulators have been used. AC generators with non-contact type regulators that use semiconductor circuits mainly consisting of ICs to intermittent field current are coming into use. This alternator with a non-contact type regulator does not use mechanical contacts, so it is characterized by high reliability and long life.

An example of such a conventional alternator circuit is shown in FIG. In the figure, 10 includes a stator coil 12, a rectifier 14, a field coil 16, and an excitation diode 18 for supplying current to the field coil 16, and is an IC constituted by a semiconductor circuit using a hybrid IC. An alternator with a built-in regulator 20, 22 a charge warning lamp with one terminal connected to the regulator terminal L of the alternator 10, and 24 connected to the other terminal of the charge warning lamp 22 via a fuse 30. An ignition switch 26 is connected to the battery terminal B of the alternator 10 and a battery connected to the other terminal of the ignition switch 24, 28 is a fuse pull link, and 30 is a fuse.

In such a conventional alternator, when the ignition switch 24 is off, the charge warning lamp 22 is not lit and the field coil 16 is not energized. When the ignition switch 24 is turned on and the engine is stopped, the potential at point A of the alternator 10 is almost zero, so the current supplied from the battery 26 is
4. It flows through the charge warning lamp 22, the regulator terminal L, the field coil 16, and the IC regulator 20, and the charge warning lamp 22 is turned on, and the field coil 16 of the alternator 10 is excited. When the engine is put into operation by rotating the starter, if the alternator 10 is normal, it will start generating electricity and voltage will be generated at point A, so both ends of the charge warning lamp 22 will have almost the same potential, and the charge warning lamp 22 will be at almost the same potential. The awning lamp 22 is turned off.

In such a conventional alternator, the initial excitation circuit for the field coil 16 of the alternator 10 is only one system that passes through the regulator terminal L of the alternator, so if this system is disconnected or a terminal contact failure occurs for some reason. In this case, there is a problem that the field coil 16 is no longer energized and the alternator does not operate normally.

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide an alternator with a highly reliable circuit for initial excitation of a field coil.

The present invention provides an ignition switch in which an output end and the other end of the excitation diode are connected to a battery in an alternator with a contactless regulator equipped with an excitation diode for supplying current to a field coil. a relay circuit including a series circuit of a first diode and a relay coil having the output end side of the excitation diode as the cathode; and a second relay circuit having the output end side of the excitation diode as the cathode. An initial excitation circuit including a series circuit of a diode and an initial excitation resistor is connected in parallel, a normally open contact is closed by excitation of the relay coil and one end is grounded, and the other end of the normally open contact is connected in parallel. It is connected to one end of the ignition switch via a power generation display means.

Furthermore, in the same AC generator, by arranging the initial excitation resistance of the initial excitation circuit inside the generator body, it is possible to prevent the influence of heat on other circuits and equipment when the initial excitation resistance generates heat. This is what I did.

Embodiments of the present invention will be described in detail below with reference to the drawings. In this embodiment, as shown in FIG. 2, a fuse 32 is connected to one end of a field coil 16 and one end of an ignition switch 24, one end of which is connected to a battery 26 via a fusible link 28. Initial excitation resistance 5 between the other end
An initial excitation circuit 50 is connected in series with a backflow prevention diode 54 whose cathodes are the relay coil 44 and the field coil 16 side, and a relay circuit where a backflow prevention diode 46 whose cathodes are the relay coil 44 and the field coil 16 side are connected in series. 40 are connected in parallel, and the charge warning lamp 22 is connected to the battery 26 via a normally open relay contact 42 whose opening and closing are controlled by the excitation of the relay coil 44. The other points are the same as those of the conventional example, so the explanation will be omitted. Note that the initial excitation resistor 52 of the initial excitation circuit 50 is arranged within the main body of the alternator 10. In addition, the power generation display relay circuit 4
One end of the backflow prevention diode 46 of No. 0 is connected to the regulator terminal L of the alternator 10, and one end of the relay coil 44 is connected to the regulator terminal L of the alternator 10.
One end of the relay contact 42 is directly grounded, and the other end is connected to one end of the charge warning lamp 22 and various parts that require a ground signal when the engine is stopped, such as a ground signal. It is connected to the stop lamp disconnection warning light, the washer level warning light, the battery fluid level warning light, the engine oil warning light, etc., which are often checked for disconnection by being turned on. The other points are the same as those of the conventional example, so the explanation will be omitted.

The operation will be explained below. First, when the ignition switch 24 is turned off, no voltage is applied to the charge warning lamp 22.
is in an off state, and the field coil 16 is also not excited. When the ignition switch 24 is turned on, since the potential at point A of the alternator 10 is almost zero when the engine is stopped,
The current supplied from the battery 26 passes through the ignition switch 24 and the fuse 32, and then passes through the initial excitation circuit 50 consisting of an initial excitation resistor 52 and a backflow prevention diode 54, and the relay coil 4.
4 and a power generation display relay circuit 40 composed of a backflow prevention diode 46, the field coil 16 of the alternator 10 is excited. At this time, in the power generation display relay circuit 40, the relay coil 44 is excited, so the relay contact 4
2 is attracted and closed, and part of the current supplied from the battery 26 is also supplied to the charge warning lamp 22 via the ignition switch 24 and the fuse 30, so the charge warning lamp 22 is lit. becomes. At this time, since one end of the charge warning lamp 22 is directly grounded by the relay contact 42 of the power generation display relay circuit 40, a complete ground potential can be supplied to the various components. Furthermore, when the starter is rotated and the engine is in operation, if the alternator is normal, a voltage is generated at point A, so the potentials at both ends of the relay coil 44 become approximately equal, and the relay coil 44 and the initial excitation resistor 52
No current will flow through. When current stops flowing through the relay coil 44, the power generation display relay circuit 40
The relay contact 42 is opened, and the charge warning lamp 22 is turned off again. In this engine rotation state, the alternator 10 breaks down,
When voltage is no longer generated at point A, current flows through the relay circuit 44 again, the relay contact 42 is attracted, and the charge warning lamp 22 is closed.
lights up to notify the driver of an abnormality in the power generation system.

In this embodiment, the initial excitation circuit for the field coil 16 is composed of both the initial excitation circuit 50 and the power generation display relay circuit 40.
Even if one circuit is disconnected or has a poor contact for some reason, the field coil 16 is reliably energized by the other circuit, so the alternator operates normally and reliability is greatly improved. do.

In addition, in this embodiment, since the reverse current prevention diode is connected to the initial excitation circuit and the relay circuit, even if the potential at point A becomes higher than the voltage of the battery 26, the initial excitation circuit and the relay are connected from the excitation diode to the initial excitation circuit and the relay circuit. Current is prevented from flowing through the circuits to each circuit on the ignition switch side, and the excitation diode is prevented from being destroyed by a large current.

Additionally, if you forget to turn off the ignition switch when the engine is stopped, current may continue to flow through the field coil through the initial excitation resistor, causing the initial excitation resistor to generate heat. Since it is placed inside the alternator body, other circuits and equipment are not affected by heat.

In the above embodiment, the power generation display means of the power generation display device was a charge warning lamp, but the power generation display means is not limited to this, and for example, an audible alarm or the like can be used.

Moreover, although the present invention is applied to an automobile alternator in the above embodiment, the scope of application of the present invention is not limited thereto, and it is clear that the present invention can be applied to a general alternator.

As explained above, according to the present invention, the operational reliability of the generator is greatly improved, and since relay contacts are used to control the power generation display means, they are not used like transistors to prevent damage caused by surge voltage. Since there is no need for anything similar to a resistor, a sufficient voltage can be applied to the power generation display means, and since the power generation display means is grounded via a relay contact, a nearly perfect ground potential can be obtained, allowing the ignition to turn on. An excellent effect can be obtained in that malfunction of the electronic circuit for checking disconnection, which is sometimes performed, does not occur, and the excitation diode and relay coil are protected by the backflow prevention diode.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional alternating current generator with a non-contact type regulator, and FIG. 2 is a circuit diagram showing an embodiment of the alternating current generator according to the present invention. 10... Alternator, 12... Stator coil, 14... Rectifier, 16... Field coil, 18... Excitation diode, 20...
...IC regulator, 22...Charge warning lamp, 24...Ignition switch,
26...Battery, 40...Relay circuit, 42...
...Relay contact, 44...Relay coil, 46...
Diode, 50... Initial excitation circuit, 52... Initial excitation resistance, 54... Diode.

Claims (1)

[Scope of Claims] 1. In an alternator with a non-contact type regulator equipped with an excitation diode for supplying current to a field coil, an ignition generator in which an output end and the other end of the excitation diode are connected to a battery. A relay circuit including a series circuit of a first diode and a relay coil with the output end side of the excitation diode serving as the cathode, and a relay circuit having the output end side of the excitation diode serving as the cathode. An initial excitation circuit including a series circuit of a second diode and an initial excitation resistor are connected in parallel, and a normally open contact which is closed by excitation of the relay coil and whose one end is grounded is provided. An alternating current generator characterized in that the other end is connected to one end of the ignition switch via a power generation display means. 2. Claim 1, wherein the initial excitation resistance of the initial excitation circuit is disposed within the alternator.
Alternating current generator as described in section. 3. The alternating current generator according to claim 1 or 2, wherein the power generation display means is a lamp.