JPS608521Y2 - 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 will be explained with reference to FIG.

In Fig. 1, 1 is equipped with an axle (not shown) and is an internal combustion engine (
This is an alternating current generator driven by an AC generator (not shown), and has an armature coil 101 and a field coil 102 connected in a three-phase star shape.

2 is a full-wave rectifier for rectifying the alternating current output of the generator 1, and 201, 202, and 203 are first, second, and third rectifier output ends, respectively.

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

304 is a resistor provided in the base circuit of the transistors 302 and 303; 305 is a resistor provided in the base circuit of the transistors 302 and 303;
306 is a Zener diode that detects the output voltage of the generator 1 and becomes conductive when the output voltage reaches a predetermined value; 307, 30;
8 is a resistor that is connected in series between the second rectified output terminal 202 and the second rectified output terminal 203 of the generator 1 and constitutes a voltage dividing circuit, 4 is a storage battery, 5 is a key switch, and 6 is initial excitation. A resistor, 7 is a charging indicator light connected in parallel with this resistor, 8 is a neutral point voltage operated relay, and 801 is its driving coil, which is connected between the neutral point 103 of the generator 1 and ground.

802 is a normally open contact driven by the drive coil 801, and 9 is an electric load for auto choke and a semiconductor heater.

The operation of the conventional device configured as 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 30.
Since transistors 2 are conductive, a field current is supplied from the storage battery 4 to the field coil 102 through the transistors 303 and 302, and a field magnetomotive force is generated.

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

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, the zener diode 306 maintains a non-conducting state, so that the output voltage of the generator 1 increases as the rotational speed increases.

After that, when the rotational speed of the generator 1 further increases and the output voltage becomes equal to or higher than a predetermined value, the voltage dividing point potential of the voltage dividing circuit also increases, and 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 become non-conductive, the field current is cut off, and the output voltage of the generator 1 decreases.

When this output voltage drops below the specified value, the Zener diode 306 and the transistor 305 become non-conductive again.
Transistors 303 and 302 are conductive and field coil 1
02 is energized, the output voltage of the generator 1 increases again.

The above-described operation is repeated to control the output voltage of the generator 1 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 displayed at the second rectified output end 2 of the generator 1.
When the output voltage of 02 becomes approximately equal to the power supply voltage value of the storage battery 4, the light is turned off due to a decrease in the potential difference across the resistor 6, and the storage battery 4
Displays charging status.

At this time, the voltage at the neutral point 103 of the generator 1 also increases to generate a voltage that is approximately half of the voltage at the first current output terminal 201 and the second rectified output terminal 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, current flows from the storage battery 4 to the auto choke heater 9 via the key switch 5 and the normally open contact 802.

However, in the conventional device described above, a relay 8 is required to be inserted in order to operate the auto-choke heater 9 after the internal combustion engine is started, and in order to drive this relay 8, a neutral point is connected to the generator 1. This method requires 103 terminals, is expensive, has complicated wiring, requires a large number of parts, and has the disadvantage of resulting in an unreliable device.

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.

In FIG. 2, 10, 11, 12 are the second rectified output ends 202.
Three diodes are inserted in the forward direction with respect to the output from the autochoke heater 9, that is, the anodes are inserted in the second rectified output end 202 and the cathodes are inserted in series with the terminals of the autochoke heater 9.

Furthermore, the resistance values of these three diodes 10, 11, and 12 are set so that the auto-choke heater 9 does not operate due to energization from the storage battery 4, but operates due to the output from the second rectified output terminal 202. There is.

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

First, when starting the engine, when the key switch 5 is closed,
From the storage battery 4 to the key switch 5 resistor 6 and charge indicator light 7
, a base current is supplied to the transistors 303 and 302 via the resistor 304, and the transistors 303 and 302 become conductive.

When the 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 charging indicator light 7 lights up to indicate the non-charging state of the storage battery 4.

Also, at this time, current attempts to flow from the storage battery 4 to the diode 10, 11, and 12 through the resistor 6 and charging indicator light 7, but the diode 10,
11 and 12 are inserted in series in the forward direction, and the sum of the forward voltage drops is higher than the voltage applied to the second rectified output terminal 202. current does not flow.

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.

At this time, a voltage greater than the sum of the forward voltage drops of the diodes 10, 11, and 12 is applied to the autochoke heater 9 connected to the second rectified output terminal 202, so that a current flows therethrough and the autochoke heater 9 is driven.

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

That is, in this embodiment, three diodes 10, 11, and 12 are connected in series to the autochoke heater 9 connected to the second rectified output end 202, and the output from the second rectified output end 202 and the storage battery. By connecting each output in the forward direction to the output of 4, the auto choke heater 9
This eliminates the need for the relay 8 that connects and disconnects the power and the neutral point terminal of the charging generator 1, making the circuit simple and reducing the number of parts.Also, the auto choke heater 9 can be reliably driven when the engine starts. This has the excellent effect of improving reliability and lowering the cost.

In the above description, the initial excitation resistor 6 and the charging indicator light 7 are connected between the storage battery 4 and the field coil 102, but the present invention is also applicable to a system in which these are not provided.

As described above, in this invention, the auto-choke heater is connected in series between the second rectified output end of the charging generator and the negative electrode side of the storage battery, and the anode is connected to the second rectified output end of the charging generator, and the cathode is connected to the auto-choke heater. Since one or more diodes are connected in series to the positive terminals of the auto-choke heaters and are capable of blocking current flow from the storage battery, the auto-choke heaters are connected in series to the positive terminals of the auto-choke heaters. The auto choke heater is driven only by the output, so the auto choke heater is reliably driven when the engine is started.

Further, unlike conventional devices, there is no need to provide relays, neutral point terminals, etc., so the circuit is simple, the number of parts is reduced, maintenance is easy, and the cost is low.

[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
is a field coil, 103 is a neutral point, 2 is a full-wave rectifier, 2
01 is the first rectified output end, 202 is the second rectified output end, 20
3 is a third rectifier output terminal, 3 is a voltage regulator, 301 is a diode, 302, 303, and 305 are transistors, 30
4,307.308 is a resistor, 306 is a Zener diode, 4 is a storage battery, 5 is a key switch, 6 is an initial excitation resistance,
7 is a charging indicator, 8 is a relay, 801 is a drive coil, 8
02 is a normally open contact, 9 is an auto choke heater, 10,
11 and 12 are diodes. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A field of the charging generator that is excited from the second rectified output end in a charging generator in which AC outputs from armature coils are rectified by rectifiers and output from first, second, and third rectified output ends. a magnetic coil, a storage battery charged from a first rectified output end of the charging generator, connected in series with 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 field current; a connection point between the second rectified output end of the charging generator and the positive electrode side of the storage battery; an electric load consisting of an auto-choke heater connected in series between the negative electrode side of the storage battery; and an anode connected to the connection point between the second rectified output end of the charging generator and the positive electrode side of the storage battery; A control device for a charging generator, comprising one or more diodes connected in series with the electrical load, each having a cathode connected to its end, and capable of blocking current flow from the storage battery.