JPH049023B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a charging generator control device, and in particular, it is equipped with a switching device and a diagnostic device to detect and display an abnormal state, and also to control oscillation. The present invention relates to a charging generator control device that controls on/off the switching device and supplies an initial excitation current with a constant average value.

[Conventional technology]

First, a conventional device of this type will be explained with reference to FIG. In the figure, 1 is a three-phase alternating current generator installed in a vehicle (not shown) and driven by an engine (not shown), and an armature coil 1 connected in a three-phase star shape.
01 and a field coil 102. 2 is a full-wave rectifier for full-wave rectifying the alternating current output of the generator 1; 201, 202, and 203 are first and second rectified output ends and a ground end, respectively; 3 is the field coil 10;
This is a voltage regulator that controls the output voltage of the generator 1 to a reference adjustment value by controlling the field current flowing through the generator 2, and is composed of the following parts.

That is, 301 is a surge absorbing diode connected to both ends of the field coil 102;
Reference numeral 02 denotes a Darlington-connected power transistor for intermittent current flow in the field coil 102, 304 a resistor forming a base circuit of the transistors 302 and 303, and 305 controlling on/off of the transistors 302 and 303. The control transistor 306 is a zener diode that detects the voltage at the second rectified output terminal 202 of the generator 1 and becomes conductive when the output voltage reaches a reference adjustment value, and the zener diodes 307 and 308 are connected in series with each other. , a resistor 309 constituting a voltage divider circuit is an initial excitation resistor that is connected in parallel with the charge indicator light 6 and can supply an initial excitation current to the generator 1 even if the charge indicator light 6 is disconnected. . 4 is a storage battery, and 5 is a key switch.

Next, the operation of the conventional device configured as above will be explained. First, when the key switch 5 is closed when starting the engine, the transistor 302,
A base current is supplied to transistor 303, and transistor 3
03,303 is conductive. The transistor 30
2, 303 conducts, a field current flows from the storage battery 4 to the field coil 102 via the key switch 5, charging indicator 6, resistor 309, field coil 102, and transistors 302, 303, and the field magnetomotive force occurs.

When the engine is started in this state and the generator 1 is driven, an AC output is induced in the armature coil 101 according to the rotation speed, and this output is full-wave rectified by the full-wave rectifier 2. . Here, when the rectified output is below the reference adjustment value, the voltage dividing point potential of the voltage dividing circuit constituted by resistors 307 and 308 is still low, so
The Zener diode 306 does not become conductive and maintains a non-conductive state, and the supply of field current is maintained, so that the output voltage of the generator 1 increases as the rotation speed increases. ing. After that, when the rotational speed of the generator 1 further increases and the output voltage exceeds the above reference adjustment value, the voltage dividing point potential of the voltage dividing circuit consisting of resistors 307 and 308 also increases, and the zener diode 306 The base current is supplied to the transistor 305 through the Zener diode 306, and the transistor 305 becomes conductive.
When the transistor 305 becomes conductive, the base current of the transistor 303 is cut off, and then the base current of the transistor 302 is also cut off, so the transistors 302 and 303 become non-conductive, and the current flowing through the field coil 102 is cut off. generator 1
output voltage decreases. When this output voltage falls to the reference adjustment value, the voltage dividing point potential of the voltage dividing circuit consisting of resistors 307 and 308 becomes low, so the Zener diode 306 becomes non-conductive again, and the base current to the transistor 305 is cut off. Therefore, the transistor 305 becomes non-conductive, and the base current is supplied to the transistors 302 and 303 through the resistor, so the transistors 302 and 303 become conductive, and a field current flows through the field coil 102, and the output voltage of the generator 1 rises again.

By repeating the above-described operations, the output voltage of the generator 1 is controlled to the above-mentioned standard adjustment value, and the storage battery 4 is charged with this controlled voltage. Further, at this time, the output voltage of the second rectified output terminal 202 also becomes approximately the standard adjustment value, and the potential difference with the storage battery 4 is almost eliminated, so the charging indicator light 6 goes out and displays the charging state of the storage battery 4.

However, in the above-mentioned conventional device, if a part of the excitation circuit of the field coil 102 is disconnected,
Even when the generator 1 is in a non-generating state, the charging indicator light 6 does not light up. For this reason, the non-charging state cannot be determined, leading to a battery drain. Also, the field magnetic coil 102
Since the charging indicator light 6 is connected to the excitation circuit of the generator, the start-up excitation current of the generator cannot be used effectively, and the start-up characteristics of the generator are poor. The present invention provides an excellent charging generator control device that eliminates the above-mentioned drawbacks.

[Means to solve the problem]

A charging generator control device according to the present invention rectifies an AC output induced in an armature coil of a charging generator, and includes a rectifying device having first and second rectified output ends and a ground terminal, and a rectifying device that rectifies an AC output induced in an armature coil of a charging generator. A storage battery is charged by the output of the first rectifying output terminal, a field coil of the charging generator is excited by the output of the second rectifying output terminal of the rectifying device, and the current flow to the field coil is intermittent. Therefore, a voltage regulator that controls the output voltage of the generator to a reference adjustment value, a charging indicator light connected in series between the storage battery and the grounding terminal via a key switch, and the charging indicator light and the grounding terminal are provided. a switching element connected in series between the terminals;
a diagnostic device that detects the voltage at the rectified output terminal, detects no power generation of the charging generator and an uncontrolled abnormal state, and conducts the switching element; connected between the key switch and the second rectified output terminal; and the voltage at the second rectified output terminal is set to a value lower than the reference adjustment value according to the voltage value set at the voltage setting terminal when the charging generator is not generating power, that is, a setting that defines no power generation. The present invention is characterized in that it includes a switching device that adjusts the switching device to a value below the voltage value, and an oscillation device that is connected between the voltage setting end of the switching device and the ground terminal and controls the switching device on and off.

[Effect]

With this configuration, the diagnosis device can detect any non-electrical abnormality in the charging generator and display it on the charging indicator light, and the oscillator can control the switching device on and off to initialize the field coil. Since the excitation current is passed through, the switchgear generates less heat. Furthermore, since the energizing circuit for the charging indicator lamp can be configured as a separate circuit from the excitation circuit for the field coil, the excitation current to the field coil can be used effectively, thereby improving the startup characteristics of the generator.

〔Example〕

An embodiment of the present invention shown in FIGS. 2 to 7 will be described below.

In Figure 2, 7 is an oscillation device consisting of a commonly used multivibrator, and resistor 7
05 to 708, capacitors 703 and 704, and transistors 701 and 702, and the transistors 701 and 702 perform an operation in which they are alternately turned on and off. 8 is a switchgear, and when the generator 1 starts up, an initial excitation current with a constant average value whose set value can be changed is sent to the field coil 102.
When the excitation circuit is disconnected and the switching device 8 is turned on by a command from the oscillator 7, the voltage at the second rectified output terminal 202 can be set to an arbitrary value. The parts configuration is as follows.

That is, 801 is a series control transistor that turns on and off the initial excitation current according to a command from the oscillator 7;
02 is a maximum initial excitation current setting resistor 803 connected in series to the emitter terminal of the transistor.
is a backflow blocking diode during power generation, 804,
805 are connected in series with each other, and the voltage setting terminals 80
7 Resistors that make up the voltage divider circuit for setting the voltage,
806 is a diode that transmits an on/off command from the oscillator 7 to the switching device 8, and 807 is a voltage setting terminal. Reference numerals 10 and 11 denote Darlington-connected transistors which are switching elements connected in series between the charging indicator 6 and the ground, and 9 a diagnostic device which detects an abnormal state and activates the transistors 10 and 11.
It has the function of making the charging indicator light 6 conductive and lighting the charging indicator light 6, and is composed of the following parts. 903 is a ripple absorption capacitor, 904 is a charging indicator light 6
Inrush current during lighting and current limiting resistance during incorrect wiring, 9
907 is a resistor connected to the base circuit of the transistors 10 and 11 through the diode 905, and 908 is the voltage at the second rectified output terminal 202 that specifies no power generation. 909 is the transistor 908 which turns off when the voltage is less than the set value, and causes the base current to flow to the transistors 10 and 11 through the resistor 907 and the diode 905 to make them conductive.
Zener diodes 910 and 91 are connected in series to the base terminal of the zener diodes 910 and 91 and are conductive when the voltage of the second rectified output terminal 202 exceeds a set value that defines no power generation.
1 are connected in series with each other, and a second rectified output end 20
A resistor 912 constitutes a two-voltage voltage divider circuit, and 912 is the second resistor.
Zener diode, 913, 9, conducts when the rectifier output terminal 202 voltage exceeds a set value that defines no control;
14 are connected in series with each other, and the second rectified output end 2
02 voltage divider circuit, and when the second rectified output terminal 202 voltage is equal to or higher than the set value that defines no control, the Zener diode 912 and the diode 90
A resistor 915 causes the base current to flow to the transistors 10 and 11 through 6 to make them conductive. 915 is a diode for lighting the charging indicator 6 when the wiring between the connection point of the key switch 5 and the charging indicator 6 and the transistor 801 is open. be.

The operation of an embodiment of the apparatus of the present invention constructed as described above will be explained.

First, when the key switch 5 is closed when starting the engine, the transistor 30 is turned on as in the conventional device.
2, 303 are conductive, and the transistor 801 is also supplied with base current from the storage battery 4 through the key switch 5, charge indicator 6, diode 915, and resistor 804, and is conductive. resistance 80
2, the field coil 1 via the diode 803, the field coil 102, and the transistors 302 and 303.
A field current flows through 02, generating a field magnetomotive force.
At this time, since the transistor 701 of the oscillation device 7 is repeatedly turned on and off, the transistor 801 is constantly controlled to be turned on and off through the diode 806.

FIG. 3 shows the oscillation waveform output from the oscillation device 7.
FIG. 4 shows the initial excitation current waveform supplied to the field coil 102. In the figure, the field current is field coil 1
Due to the influence of the inductance of 02, when the transistor 801 is on, it increases sequentially, and when it is off, it sequentially decreases through the surge absorbing diode 301. FIG. 5 shows the initial excitation current waveform supplied from the storage battery 4 when the transistor 801 is on.
FIG. 6 shows the second rectified output end 20 during no power generation.
It is a two-voltage waveform.

In the switchgear 8, the resistance between the voltage setting terminal 807 and the ground terminal is determined by the value of the resistor 805 and the field coil 10.
A parallel composite resistance value is obtained by multiplying the series composite value of the two resistance values and the resistor 802 by the current amplification factor of the transistor 801. For this reason, the parallel combined resistance value and resistance 8
The voltage at the voltage setting terminal 807 is determined by the ratio of 04.
In the excitation circuit, when the voltage from the second rectified output terminal 202 to the ground terminal is open, the voltage at the voltage setting terminal 807 is determined to be below a set value that defines no power generation. The maximum value of the initial excitation current flowing through the transistor 801 is determined by the following calculation. That is, the voltage setting terminal 8
The value obtained by subtracting the base-emitter voltage of the transistor 801, the voltage drop of the diode 803, and the collector-emitter voltage of the transistor 302 from the 07 voltage is calculated as the field coil 102 resistance and the resistance 802.
The current value is divided by the composite value of . Further, the average value of the initial excitation current is set by the duty ratio of the oscillation device 7. Since the voltage at the voltage setting terminal 807 is set below the set value that defines no power generation when the excitation circuit is disconnected, when the generator 1 starts up, the zener diode 909 of the diagnostic device 9 becomes non-conductive, and the transistor 908 becomes non-conductive. Turn off. By turning off the transistor 908, the transistors 10,1
1 is supplied with a base current through a resistor 907 and a diode 905 and becomes conductive, and a circuit including a storage battery 4, a key switch 5, a charge indicator light 6, a resistor 904, and transistors 10 and 11 lights up a charge indicator light 6. This state is shown in FIG. 7C. Next, the engine starts, the generator 1 generates electricity, and the voltage regulator 3
Similar to the conventional device, transistors 302 and 303 turn on and off to control the reference adjustment value, and Zener diode 909 becomes conductive, transistor 908 turns on, and transistors 10 and 303 turn on and off.
11 is turned off by cutting off the base current, and in this state, the transistor 801 of the switchgear 8 is controlled on/off by the oscillator 7, but the voltage at the second rectified output terminal 202 is higher than that of the switchgear. Since the output terminal voltage is higher than the output terminal voltage of 8, current is no longer supplied to the excitation circuit of the field coil 102 via the switching device 8.

Therefore, depending on the on/off signal of the oscillator 7,
Although the transistor 801 is constantly controlled to be turned on and off, it does not affect the control of the excitation circuit of the field coil 102, and therefore, a stop circuit for the oscillation device 7 is not required.

In this state, if an open failure occurs in the field coil 102, the transistors 302, 303, and the wiring that are part of the excitation circuit, the voltage at the second rectified output end 202 will have the waveform shown in FIG. 6. Under the above conditions, even when the transistor 801 is on, the voltage setting terminal 80
The voltage at 7 is set to be below a set value that defines no power generation. Therefore, the voltage of the second rectified output terminal 202 becomes less than the set value that defines no power generation, the Zener diode 909 of the diagnostic device 9 becomes non-conductive, and the transistor 908 turns off. By turning off the transistor 908, the transistor 1
0 and 11 are supplied with base current through the resistor 907 and the diode 905 and are made conductive, and the charging indicator light 6 lights up in the same way as at the time of startup, indicating the non-power generation state as shown in FIG. 7C. Note that the transistor 908,
A similar effect can be obtained by using a circuit using a comparator for the Zener diode 909. next,
If the output voltage of the generator 1 cannot be controlled to the standard adjustment value due to a failure of the voltage regulator 3, and the storage battery 4 exceeds a set value that specifies no control, resulting in overcharging, the The voltage dividing point voltage of the voltage dividing circuit of the second rectified output terminal 202 voltage also increases.
Due to the rise in voltage, the Zener diode 912 becomes conductive, and the base current is supplied to the transistors 10 and 11 through the diode 906 to make them conductive.
The charging indicator light 6 is turned on. This state is shown in Figure 7a.
Shown below. In addition, due to the disconnection of the first rectified output end 201, when the generator 1 is generating electricity but the storage battery 4 is not charged, a problem may occur at the first and second rectified output ends 201, 202. There is a period when the voltage exceeds the set value that defines no control. During this period, Zener diode 912 is conductive, and transistors 10 and 11 are intermittently supplied with base current through diode 906. However, due to the function of the capacitor 903, the transistors 10 and 11 are always conductive, and the charging indicator light 6 is turned on. This state is shown in FIG. 7a.

Note that the same effect can be obtained by using a circuit using a comparator for the Zener diode 912.
Furthermore, as for the resistor 802, the same effect can be obtained even if the resistor 802 is omitted by lowering the voltage at the voltage setting terminal 807.

As described above, in this device, abnormalities such as no power generation, no control, and disconnection of the first rectified output end 201, which could not be detected in the conventional system, are detected and the charging indicator light 6 is turned on. That is, regarding no power generation, it is detected by setting the voltage setting value 807 voltage so that it is always below the set value that defines no power generation, and when there is no control, it is detected by setting a set value that defines no control. ing.

Next, if the first rectified output end 201 is off, it is detected by using the fact that it exceeds a set value that defines no control for a certain period of time. As a result, it is effective to prevent the battery from being overcharged when no power is generated or when the first rectified output end 201 is disconnected, and to prevent overcharging of the storage battery 4 and destruction of the electric load and failure when no control is performed.

Regarding the initial excitation current, the oscillator 7 controls the transistor 801 on and off to keep the average value of the current flowing through the field coil 102 constant. That is, when the transistor 801 is turned on or off, the field coil 102 is
However, as shown in FIG. 4, when the transistor 801 switches on, a current higher than the average value flows through the field coil 102, and conversely, the transistor 801 switches from on to off. In other words, since the field coil 102 is energized via the diode 301, the current flowing to the field coil 102 is reduced, but overall the field coil 10
The average value of the current flowing through the switchgear 2 is the same as that of the conventional device, and compared to the case where the transistor 801 is always turned on and the field coil 102 is energized, the current is passed intermittently, which reduces heat generation in the switchgear 8. It can be reduced. Furthermore, since the energizing circuit for the charging indicator 6 can be configured as a separate circuit from the excitation circuit for the field coil 102, the excitation current to the field coil 102 can be used effectively, so that the start-up characteristics of the generator 1 can be improved.

〔Effect of the invention〕

As described above, in this invention, the AC output induced in the armature coil of the charging generator is rectified, and the
a rectifier having a second rectifier output end and a ground terminal;
A storage battery charged by the output of the first rectification output end of the rectification device, a field coil of the charging generator excited by the output of the second rectification output end of the rectification device, and a current flowing to the field coil. a voltage regulator that controls the output voltage of the generator to a reference adjustment value by intermittent switching on and off; a charging indicator light connected in series between the storage battery and the ground terminal via a key switch; A switching element connected in series between the indicator light and the ground terminal, detects the voltage at the second rectified output terminal, detects no power generation of the charging generator, and detects an uncontrolled abnormal state, and connects the switching element to the switching element. a diagnostic device that connects the key switch and the second
The voltage at the second rectifier output terminal is set to a value lower than the reference adjustment value or less, depending on the voltage value set at the voltage setting terminal when the charging generator is not generating power. That is, by providing a switchgear that adjusts the voltage below a set value that defines no power generation, and an oscillation device that is connected between the voltage setting terminal of the switchgear and the ground terminal and controls the switching on and off, The diagnosis device can detect abnormality of no power generation in the charging generator and display it with the charging indicator light, which can prevent battery build-up.In addition, the oscillator can control the switching device on and off to set the initial excitation current to the field coil. Since the initial excitation current can be supplied to the field coil with a constant average value, which can change the startup setting of the generator, the startup characteristics of the generator can be stabilized, and the heat generation of the switchgear can be reduced. Furthermore, since the energizing circuit for the charging indicator light can be configured as a separate circuit from the excitation circuit for the field coil, the excitation current to the field coil can be used effectively, which improves the startup characteristics of the generator. has.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing a conventional device, Fig. 2 is an electric circuit diagram showing an embodiment of the present invention, and Fig. 3 is an electric circuit diagram showing an embodiment of the present invention.
The diagram shows the oscillation waveform of the oscillation device 7 shown in FIG. 2, FIG. 4 shows the initial excitation current waveform flowing through the field coil 102 shown in FIG. 2, and FIG. 5 shows the initial excitation current flowing through the transistor 801 shown in FIG. 2. Waveform, Figure 6 is the second waveform.
The second rectified output end 202 during no power generation shown in the figure
Voltage waveform FIG. 7 is a diagram showing the state of the charging indicator light 6 with respect to the generator output voltage in the embodiment shown in FIG. In the figure, 1 is an alternating current generator, 101 is an armature coil, 102 is a field coil, 2 is a full-wave rectifier, 2
01 is the first rectified output terminal, 202 is the second rectified output terminal, 203 is the ground terminal, 3 is the voltage regulator, 4 is the storage battery, 5 is the key switch, 6 is the charging indicator, 7 is the oscillation device, 8 is the switchgear , 9 is a diagnostic device, 10,
11 is a transistor. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A rectifier that rectifies the alternating current output induced in the armature coil of a charging generator and has first and second rectified output ends and a ground terminal, and is charged by the output of the first rectified output end of the rectifier. A storage battery, a field coil of the charging generator excited by the output of the second rectifying output end of the rectifying device, and by intermittent current flowing to the field coil, the output voltage of the generator is referenced. a voltage regulator that controls the adjustment value, a charging indicator light connected in series between the storage battery and the grounding terminal via a key switch, and a switching element connected in series between the charging indicator light and the grounding terminal. , a diagnostic device that detects the voltage at the second rectified output terminal, detects no power generation of the charging generator and an uncontrolled abnormal state, and makes the switching element conductive; and the key switch and the second rectified output terminal; a switching device connected between the charging generator and the switching device that adjusts the voltage at the second rectified output terminal to a set value lower than the reference adjustment value according to the voltage value set at the voltage setting terminal when the charging generator is not generating power; , and a charging generator control device including an oscillation device connected between a voltage setting end of the switching device and the grounding terminal and controlling on/off of the switching device.