JPS6114320Y2 - - Google Patents

Description

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

First, a conventional device of this type is shown in FIG. 1 and will be explained. In FIG. 1, reference numeral 1 denotes an alternating current generator installed in a vehicle (not shown) and driven by an internal combustion engine (not shown), which includes an armature coil 101 and a field coil 102 connected in a three-phase star shape. has. 2 is a full-wave rectifier that rectifies the AC output of the generator 1;
201, 202, and 203 are first, second, and third rectified output ends, respectively. 3 is the generator 1 above
A voltage adjustment circuit that controls the output voltage to a predetermined value.
It is composed of the following parts. That is, 301 is a surge absorbing diode connected to both ends of the field coil 102, and 302 and 303 are transistors that are switching elements that cut off the field current of the field coil 102, and are connected to each other in Darlington. is called a power transistor, and 303 is called a driver transistor. 304 is a base resistor provided in the base circuit of these transistors 302 and 303; 305 is a base resistor provided in the base circuit of these transistors 302 and 303;
A transistor 306 detects the output voltage of the generator 1,
Zener diode 30 constituting a detection element that is energized when this output voltage reaches a predetermined value or higher;
7,308 is the second rectified output end 20 of the generator 1
2 are each connected in series to form a voltage divider circuit; 4 is a storage battery; 5 is a key switch; 6 is a storage battery;
is a charge indicator light, and 7 is an initial excitation resistor connected in parallel with this charge indicator light 6.

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, base current is supplied from the storage battery 4 to the transistors 303 and 302 via the key switch 5, the resistor 7, the charging indicator light 6, and the resistor 304, and the transistors 303, 302 Since 302 is conductive, a field current is supplied from the storage battery 4 to the field coil 102 through these transistors 303 and 302, and a field magnetomotive force is generated. At this time,
Since a potential difference occurs in the resistor 7, the charge indicator light 6 lights up to indicate the non-charged state of the storage battery 4.

When the engine starts and the generator 1 is driven in this state, the armature coil 101
An alternating current output is induced. This output is full-wave rectified by a full-wave rectifier 2. Here, when the rectified output voltage is below a predetermined value, the resistors 307 and 30
Since the voltage dividing point potential of the voltage dividing circuit configured by 8 is still low, the zener diode 306 maintains a non-conducting state, so that the output voltage of the generator 1 decreases as the rotation speed increases. It is rising.

After that, when the rotational speed of the generator 1 further increases and the output voltage exceeds a predetermined value accordingly, the voltage dividing point potential of the voltage dividing circuit also increases, and the zener diode 306 becomes conductive. A base current flows to the transistor 305 through the Zener diode 306, and the transistor 305 becomes conductive. When this transistor 305 becomes conductive, the transistors 303 and 302 become non-conductive, cutting off the field current of the field coil 102 and lowering the output voltage of the generator 1.

When this output voltage decreases to a predetermined value, the Zener diode 306 and the transistor 305 become non-conductive again, the transistors 303 and 302 become conductive, and the field coil 102 is energized, so that the output voltage of the generator 1 is reduced again. Rise.

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.

On the other hand, the charging indicator light 6 is connected to the second rectified output end 202.
When the output voltage becomes approximately equal to the power supply voltage value of the storage battery 4, the electric potential difference across the resistor 7 decreases and the light goes out to display the state of charge of the storage battery 4.

However, in the conventional device described above,
In order to initially excite the generator 1 by supplying electricity from the storage battery 4 to the transistors 303, 302 and the field coil 102 even if the charge indicator light 6 is disconnected during long-term use, it is initially connected in parallel with the charge indicator light 6. It is necessary to insert the excitation resistor 7, and therefore a case to house and support the initial excitation resistor 7 and an installation space for the wiring are required, and the probability of disconnection of the charging indicator light 6 is low. For time protection,
This inevitably results in a complicated and expensive device.

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

Examples of this invention shown in FIGS. 2, 3, and 4 will be described below.

First, in FIG. 2, the transistor 30
A base resistor 304 of 2,303 is connected in series to the connection point between the key switch 5 and the charging indicator light 6, and the conventional initial excitation resistor 7 is not provided. Further, one end of the surge absorbing diode 301 is connected to the second rectified output end 202. Next, the operation of the embodiment apparatus configured as shown in FIG. 2 will be explained. First, when the charging indicator light 6 is normal and not disconnected, when the key switch 5 is closed when starting the engine, the power is transferred from the storage battery 4 to the key switch 5, the transistor 303, and the transistor 303 via the resistor 304.
302 is supplied with base current, and transistor 3
03,302 is conductive. This transistor 30
3, 302 conducts, the field coil 102 is connected from the storage battery 4 via the key switch 5 and the charging indicator light 6.
A field current flows through the field, and a field magnetomotive force is generated. At this time, the charging indicator light 6 lights up to indicate the non-charging state of the storage battery 4. If you are using this device for a long time,
Even if the charge indicator light 6 is disconnected, when the key switch 5 is closed, base current is supplied from the storage battery 4 to the transistors 303 and 302 via the key switch 5 and the resistor 304, and the transistors 303 and
302 is conductive. Generator 1 is field coil 1
The residual magnetic flux of the field core (not shown) of No. 02 generates an AC output in the armature coil 101, and this AC output is full-wave rectified and appears at the second rectified output end 202, and the field coil 102 It is applied to transistors 303 and 302 through. At this time, the transistors 303 and 302 are conductive, so the voltage between their collectors and emitters becomes 1V or less,
Since this voltage drop is small, the motor starts up by self-excitation at a rotation speed (2000 rpm or less) that poses no problem in practical use. When the generator 1 starts up by self-excitation, a voltage exceeding a predetermined value is applied to the second rectified output end 202, so the resistors 307 and 3
The potential at the voltage dividing point of the voltage dividing circuit constituted by 08 rises, thereby causing the zener diode 306 to conduct. When this Zener diode 306 becomes conductive, a base current flows to the transistor 305 through the Zener diode 306, and the transistor 30
5 is conductive. When transistor 305 becomes conductive, transistors 303 and 302 become non-conductive, the field current is cut off, and the output voltage of generator 1 decreases. When this output voltage drops to a predetermined value, the Zener diode 306 and the transistor 305 are cut off again, and the transistors 303 and 302 are turned on.
The output voltage of generator 1 increases again.

By repeating the above operations, the generator 1 controls the output voltage to a predetermined value, and charges the storage battery 4 with this controlled voltage.

In the above-described embodiment device, even if the charge indicator light 6 is disconnected during long-term use of the device, the transistors 303 and 303 are always turned off when the key switch 5 is closed.
Since the base circuit of 302 is energized by the storage battery 4, the collectors of transistors 303 and 302
Since the emitter voltage becomes a low value and the self-excited startup rotation speed due to the residual magnetic flux of the generator 1 can be lowered to the practical range (2000 rpm or less), the initial excitation resistor 7 connected in parallel to the charging indicator 6 This has the effect of making the circuit simple, highly reliable, and inexpensive.

3 and 4 show other embodiments of this invention, and FIG. 3 shows an electric circuit diagram in which the voltage detection terminal is connected to the connection point between the positive terminal of the storage battery 4 and the key switch 5. , FIG. 4 shows an electric circuit diagram in which the voltage detection terminal is connected to the first rectifier output end 202, and these embodiments can achieve the same effects as the embodiment shown in FIG. 2.

As described above, in this invention, the charging indicator light is connected via the key switch between the storage battery and the second rectified output end of the generator, and the resistor forming the base circuit of the power transistor is connected between the key switch and the charging indicator light. Even if the charging indicator light is disconnected, the field coil and power transistor can be energized via the key switch, and the charging function of the generator and the voltage regulator will not be affected. Since it does not interfere with the operation and does not require the conventional initial excitation resistor, there is no need for a case to house and support the initial excitation resistor or a mounting space for wiring the resistor, making it extremely easy to configure. It also has the advantage of being simple and therefore inexpensive.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing a conventional device, Fig. 2 is an electric circuit diagram showing an embodiment of this invention, Fig. 3,
FIG. 4 is an electrical circuit diagram showing another embodiment of this invention. In the figure, 1 is a charging generator, 101 is an armature coil, 102 is a field coil, 2 is a full-wave rectifier, 20
1 is a first rectified output end, 202 is a second rectified output end,
203 is a third rectifier output terminal, 3 is a voltage regulator, 30
1 is a diode, 302, 303, 305 are transistors, 304, 307, 308, 309 are resistors, 306 is a Zener diode, 4 is a storage battery, 5
is a key switch, 6 is a charging indicator light, and 7 is an initial excitation resistor. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A storage battery charged by a first rectified output end of a charging generator whose output is rectified by a rectifier, a field coil of the generator excited by a second rectified output end of the generator, and this field coil. A Darlington-connected power transistor is connected in series with the battery to intermittent the field current, and the power transistor is connected via a key switch between the storage battery and a second rectified output end of the generator so that the key switch is on the storage battery side. a charging generator comprising a charging indicator light, and a resistor having one end connected to a connection point between the key switch and the charging indicator light and the other end connected to the base of the power transistor to form a base circuit of the power transistor; Control device.