JPS6026494Y2 - Charging generator control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a control device for a charging generator that charges a storage battery by controlling the output voltage of the generator to a predetermined value.

First, a conventional device of this type is shown in FIG. 1 and will be explained.

In FIG. 1, numeral 1 is an alternating current generator installed in a vehicle (not shown) and driven by an internal combustion engine (not shown), which has an armature coil 1゜1 and a field coil 102 connected in a three-phase star shape. have

2 is a full-wave rectifier that rectifies the AC output of the generator 1.
01, 202, and 203 are the 1st. Second. This is the third rectified output end.

Reference numeral 3 denotes a voltage regulator that controls the output voltage of the generator 1 to a predetermined value, and is composed of the following parts.

That is, 30- is a surge absorbing diode connected to both ends of the field coil 102, and 302 and 303 are transistors which are switching elements for cutting and shutting the field current of the field coil 102, and are connected to each other in Darlington. , 30
2 is called an output transistor, and 303 is called a drive transistor.

304 is a resistor provided in the base circuit of the transistors 302 and 303, 305 is a transistor that controls on/off of the transistors, 306 detects the output voltage of the generator 1, and when this output voltage reaches a predetermined value, The conductive Zener diodes 307 and 308 are connected in series between the second rectified output terminal 202 and the third rectified output terminal 203 of the generator 1, respectively, and the resistors 4 constitute a voltage dividing circuit.
5 is a storage battery, 5 is a key switch, 6 is an initial excitation resistor, 7 is a charge indicator light connected in parallel with this initial excitation resistor 6, and 8 is a neutral point voltage activated relay.

801 is a drive coil for the relay 8, which is connected between the neutral point 103 of the generator 1 and the ground.

Reference numeral 802 indicates a normally open contact driven by the drive coil 801, and reference numeral 9 indicates an auto-choke semiconductor heater which is an electric load.

The operation of the conventional device configured as described above will be explained.

First, when the key switch 5 is closed when starting the internal combustion engine, the storage battery 4 is connected to the transistors 303 and 30 via the key switch 5, the resistor 6, the charging indicator light 7, and the resistor 304.
The base current is supplied to transistors 303 and 3.
Since 02 is conductive, these transistors 303 and 302
A field current is supplied from the storage battery 4 to the field coil 102 through the storage battery 4 to generate a field magnetomotive force.

At this time, since a voltage difference occurs in the resistor 6', the charging indicator light 7 lights up to indicate the non-charging state of the storage battery 4.

Also, at this time, the potential of the neutral point 103 of the generator 1 is low, so the normally open contact 802 remains open, and the auto choke heater 9
No voltage is applied.

When the engine is started in this state and the generator 1 is driven, an alternating current output is induced in the armature coil 101 according to its rotation speed.

This AC output is full-wave rectified by the full-wave rectifier 2.

Here, when the rectified output voltage is below a predetermined value, the resistor 307
, 308 is still low, so the zener diode 306 maintains a non-conducting state, so that the output voltage of the generator 1 increases as the rotation speed increases. do.

Thereafter, when the rotational speed of the generator 1 further increases and the output voltage accordingly exceeds a predetermined value, the potential of the voltage dividing point of the voltage dividing circuit also increases, thereby causing the zener diode 30
6 becomes conductive, and the base current flows to the transistor 305 through this Zener diode 306, and the transistor 30
5 is conductive.

If transistor 305 conducts, transistor 303.
302 becomes non-conductive, the field current is cut off, and the generator 1
The output voltage of will decrease.

When this output voltage falls below a predetermined value, the Zener diode 306 and the transistor 305 become non-conductive again, and the transistors 303 and 302 become conductive, and the field coil 102 becomes non-conductive.
is energized, so the output voltage of the generator 1 increases again.

By repeating the above-described operations, the output voltage of the generator 1 is controlled to a predetermined value, and the storage battery 4 is charged to the predetermined voltage using this controlled voltage.

At this time, the charging indicator light 7 is connected to the second rectified output end 20 of the generator 1.
When the output voltage of the battery 2 becomes approximately equal to the power supply voltage value of the storage battery 4, the electric potential difference across the resistor 6 decreases and the light is turned off to display the state of charge of the storage battery 4.

At this time, the voltage at the neutral point 103 of the generator 1 also rises, generating approximately half the voltage at the first rectified output end 201 and the second rectified output end 202, so that the drive coil 801 of the relay 8
A neutral point voltage is applied to , and the normally open contact 802 is closed.

Therefore, from the storage battery 4 to the key switch 5, the normally closed contact 802
A current flows through the auto choke heater 9 to activate the heater 9.

However, in the conventional device described above, the relay 8 is required to operate the auto-choke heater 9 after the internal combustion engine starts, and in order to drive the relay 8, the neutral point 103 of the generator 1 is required. terminal is required,
This method is expensive, has complicated wiring, and has a large number of parts, resulting in a device with low reliability.

This invention provides an excellent control device for a charging generator that eliminates the above-mentioned drawbacks.

An embodiment of this invention shown in FIG. 2 will be described below.

That is, in FIG. 2, 9 is an auto-choke heater connected between the connection point between the second rectified output end 202 of the charging generator 1 and the positive electrode of the storage battery 4, and the negative electrode of the storage battery 4. Reference numeral 10 is connected in series between the auto choke heater 9 and the connection point between the positive electrode of the storage battery 4 and the second rectified output end 202, and has a conductivity level lower than a predetermined value of the voltage regulator 3. It is a two-terminal bidirectional circuit without gates whose forward voltage drop, when conducting, is close to the forward voltage drop value of a diode.

Further, this thyristor 10 allows the second rectified output end 2 to be output from the storage battery 4 when the key switch 5 is closed when the engine is stopped.
The voltage applied to 02 (approximately 2.3V) is set to a value (for example, 8V) that will not cause conduction.

The operation of the embodiment apparatus configured as above will be explained.

First, when the key switch 5 is closed to start the engine, base current is supplied from the storage battery 4 to the transistors 303 and 302 via the key switch 5, the resistor 6, the charging indicator light 7, and the resistor 304. It's conductive.

When these transistors 303 and 302 become conductive, a field current flows from the storage battery 4 to the field coil 102 via the key switch 5, the resistor 6, and the charging indicator light 7, generating a field magnetomotive force.

At this time, since a potential difference is generated in the resistor 6, the charge indicator light 7 lights up to indicate the non-charged state of the storage battery 4.

On the other hand, at this time, since the thyristor 10 is in a non-conducting state, no current flows from the storage battery 4 and no heat is generated in the auto choke heater 9.

When the engine is started in this state and the generator 1 is driven, an alternating current output is induced in the armature coil 101 according to its rotation speed.

This AC output is full-wave rectified by a full-wave rectifier.

The voltage at the second rectified output end 202 is approximately equal to the voltage at the voltage regulator 3.
When the set value is slightly lower than the predetermined value of flows and generates heat.

The subsequent operation is similar to that of the conventional device.

In this way, by connecting the two-terminal bidirectional thyristor 10 in series with the auto-choke heater 9, which is non-conductive when energized from the storage battery 4 and conductive at a value lower than the voltage at which the voltage regulator 3 operates, Relay 8 and charging generator 1
It can perform the same functions as the conventional one with a simple configuration without requiring a neutral point terminal.

Furthermore, when the engine is stopped, the thyristor 10 does not become conductive just by closing the key switch 5, and the auto choke heater 9 is not energized until the engine is started and the charging generator 1 is activated. Even if it takes a long time for the engine to start, problems such as shortening the auto choke operation time will not occur.

In the above description, the initial excitation resistor 6 and the charge indicator light 7 are connected between the storage battery 4 and the second rectified output end 202 of the charging generator 1, but it is also possible to use a model without these. A similar effect can be obtained by providing a resistive load such that the thyristor 1o does not conduct when electricity is supplied from the storage battery 4.

As described above, in this invention, the auto choke heater is connected to the connection point between the second rectified output end of the charging generator and the positive electrode of the storage battery.
It is connected between the negative electrode of the storage battery, is connected in series with the auto choke heater, and is connected between the positive electrode of the storage battery and the connection point of the second rectified output terminal, and is non-conductive when energized from the storage battery. Conductive at a set value lower than a predetermined value in the second rectified output, the second rectified output can be applied to the auto-choke heater, and when conductive, the forward voltage drop is close to the forward voltage drop value of the diode. Since a two-terminal bidirectional thyristor is provided, unlike conventional devices, a relay for switching on and off the auto-choke heater and a neutral point terminal for the charging generator are required, so wiring is simplified.
Further, since the number of parts is reduced, the cost is reduced, and since a thyristor is used instead of a contact type relay, there is an advantage that reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing a conventional device, and FIG. 2 is an electric circuit diagram showing an embodiment of this invention. In the figure, 1 is a charging generator, 101 is an armature coil, 102
2 is a field coil, 2 is a full-wave rectifier, 201 is a first rectifier output end, 202 is a second rectifier output end, 203 is a third rectifier output end, 3 is a voltage regulator, 301 is a diode, 302,
303, 305 are transistors, 304, 307, 30
8 is a resistor, 306 is a Zener diode, 4 is a storage battery, 5
is the key switch, 6 is the initial excitation resistance, 7 is the charge indicator light,
9 is an auto-choke heater, and 1o is a two-terminal bidirectional thyristor. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The AC outputs from the armature coils are each rectified by a rectifier, and the first. Second. A storage battery that is charged by the first rectified output of the charging generator outputted from the third rectified output;
a field coil of the charging generator excited by the rectified output and the storage battery; connected in series to the field coil and connected between the storage battery and the second rectified output end; and connected to the field coil; a switching element of a voltage regulator that controls the output voltage of the charging generator to a predetermined value by intermittent current flow; a connection point between a second rectified output end of the charging generator and a positive electrode of the storage battery; An auto-choke heater connected between the negative electrode of the storage battery, and a connection point between the second rectified output end of the charging generator and the positive electrode of the storage battery, and a negative electrode of the storage battery for the auto-choke. connected in series with a heater, non-conductive when energized by the storage battery, conductive at a set value lower than the predetermined value of the second rectified output, and capable of applying the second rectified output to the autochoke heater; □ A control device for a charging generator equipped with a two-terminal bidirectional thyristor whose forward voltage drop is close to the forward voltage drop value of a diode when conducting.