JPS6341295B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a charging generator that is equipped with a switching device and a diagnostic device to detect and display abnormal conditions such as no power generation, no control, or disconnection of the first rectified output end. This invention relates to a generator control device.

First, a conventional device will be explained as shown in 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), with an armature coil 101 connected in a three-phase star shape.
and a field coil 102. 2 is a full-wave rectifier that performs full-wave rectification of the AC output of the generator 1;
01, 202, and 203 are the first and second rectified output terminals and a ground terminal, respectively; 3 controls the field current flowing through the field coil 102 to control the output voltage of the generator 1 to the first level; This is a voltage regulator that controls the voltage to a predetermined value _V1 , 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 03 indicates a Darlington-connected power transistor that switches on and off the current flowing through the field coil 102, 304 a resistor that constitutes a base circuit of the transistors 302 and 303, and 305 a control that controls on/off of the transistors 302 and 303. A transistor 306 detects the voltage at the second rectified output terminal 202 of the generator 1, and becomes conductive when this output voltage reaches a first predetermined value V ₁ Zener diodes 307 and 308 are connected in series with each other. is,
A resistor 309 constituting a voltage dividing circuit is connected in parallel with the charging indicator light 6, and is an initial excitation resistor that can supply an initial excitation current to the generator 1 even if the 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 described 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
02 and 303 are 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 less than the first predetermined value _V1 , the voltage dividing point potential of the voltage dividing circuit constituted by the resistors 307 and 308 is still low, so the Zener diode 306 does not become conductive. , the non-conducting state is maintained, and the supply of field current is maintained, 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 the first predetermined value _V1 , the voltage dividing point potential of the voltage dividing circuit also becomes high, and the zener diode 306 becomes conductive. A 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 transistors 302,
303 is cut off, the current flowing through the field coil 102 is cut off, and the output voltage of the generator 1 is reduced.

When this output voltage drops to the first predetermined value _V1 ,
Zener diode 306 again, transistor 30
5 becomes non-conductive, and transistors 302 and 3
03 becomes conductive, the field coil 102 is energized, and 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 the first predetermined value _V1 , and the storage battery 4 is charged with this controlled voltage.
Moreover, at this time, the output voltage of the second rectified output terminal 202 also becomes almost the first predetermined value V ₁ , and the potential difference with the storage battery 4 is almost eliminated, so the charging indicator light 6 turns off and the charging state of the storage battery 4 is indicated. indicate.

However, in the conventional device described above, if a part of the excitation circuit is disconnected, the charging indicator light 6 does not light up even if the generator 1 is in a non-generating state. For this reason, the non-charging state cannot be determined, and the battery may become exhausted, or the first rectified output end 201 may come off.
It had drawbacks such as not being able to detect uncontrolled conditions.

The present invention provides an excellent charging generator control device that eliminates the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, 7 is a switchgear, which supplies a constant initial excitation current whose set value can be changed to the field coil 102 when the generator 1 starts up, and when the excitation circuit is disconnected, the voltage at the second rectified output end 202 Set to any value. The parts configuration is as follows.

That is, 701 is a series control transistor that controls the initial excitation current, 702 is a resistor for setting the initial excitation current connected in series to the emitter terminal of the transistor, 703 is a backflow blocking diode during power generation, and 704 and 705 are connected in series with each other. connected, A
Resistors that make up the voltage divider circuit for setting the point voltage,
8 is a diagnostic device that detects abnormal conditions such as no power generation, no control, and disconnection of the first rectified output end 201, and turns on the charging indicator light 6. The parts configuration is as follows.

801 is a transistor for driving the charging indicator 6; 802 is a capacitor for stabilizing the operation of the transistor 801; 803 is connected in series between the charging indicator 6 and the transistor 801; Sometimes, the transistor 801
804 is a resistor connected to the base terminal of the transistor 801,
805 turns off when the above abnormal condition is detected, and resistor 8
A transistor 806 is connected to the base terminal of the transistor 805, and a Zener diode 80 becomes non-conductive when an abnormal state is detected.
7, 808, and 809 are first, second, and third resistors that are connected in series with each other and constitute a voltage divider circuit for the voltage of the second rectified output terminal 202; First predetermined value V ₁
811 is a _ripple absorbing capacitor; 811 is a ripple absorbing capacitor;
12 is a Zener diode connected to the base terminal of the transistor 810 and conductive when the voltage of the second rectified output terminal 202 is equal to or higher than the _third predetermined value V3;
813 and 814 are connected in series with each other, and the second
A resistor 815 constituting a voltage dividing circuit for the rectified output terminal 202 voltage is a diode that lights up the charging indicator 6 when the wiring from the connection point between the key switch 5 and the charging indicator 6 to the collector of the transistor 701 is open.

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, a base current flows from the storage battery 4 to the transistor 701 in the circuit including the key switch 5 and the resistor 704, making it conductive. For this reason, the field coil 102
A field current flows from the storage battery 4 through a circuit including the key switch 5 transistor 701, resistor 702, diode 703, field coil 102, and transistors 302 and 303, and a field magnetomotive force is generated.

In the switching device 7, the voltage at point A when the excitation circuit is disconnected is approximately determined by the voltage division ratio of the resistors 704 and 705 and the voltage of the storage battery 4. The maximum value of the A point voltage is set to a value that is less than or equal to a first predetermined value _V1 , and is set to a value that is less than or equal to a second predetermined value that defines no power generation. Further, the value of the initial excitation current is set by adjusting the resistor 702.

In the above state, the voltage of the second rectified output terminal 202 becomes equal to or less than the second predetermined value V ₂ because the generator 1 is not generating power, and the zener diode 806 becomes non-conductive. As a result, the transistor 805 is turned off, base current flows into the transistor 801 through the resistor 804, and the transistor 801 becomes conductive, so that the charging indicator lamp 6 lights up.

Next, when the engine is started and the generator 1 generates electricity, the output voltage of the generator 1 is controlled by the voltage regulator 3 to a first predetermined value V ₁ . At this time, the charging indicator light 6 is turned off to display the power generation status of the generator 1.
This state is within the normal operating range shown in FIG. 4C.

In this state, if an open failure occurs in the field coil 102, transistors 302, 303, and wiring that are part of the excitation circuit, the voltage at the second rectified output terminal 202 becomes less than the second predetermined value _V2 , and the Similarly, the charging indicator light 6 lights up to notify the non-power generation state. This state is the non-power generation lighting range shown in FIG. 4d. Next, due to a failure of the voltage regulator 3, etc., the output voltage of the generator 1 cannot be controlled to the first predetermined value _V1 ,
When the storage battery 4 exceeds the third predetermined value V ₃ that causes overcharging, the voltage dividing point voltage of the voltage dividing circuit of the second rectified output terminal 202 voltage formed by the resistors 813 and 814 also increases. Due to the increase in voltage, the zener diode 8
12 conducts, turning on transistor 810. Therefore, the point C is grounded, the Zener diode 806 becomes non-conductive, and the transistor 805 is turned off. As a result, the transistor 801 is supplied with a base current through the resistor 804 and becomes conductive, causing the charging indicator light 6 to light up. This state is the fourth
This is the uncontrolled lighting range shown in Figure b. Here, the second
The rectified output terminal 202 voltage increases to a third predetermined value.
When the fourth predetermined value _V4 , which is greater than or equal to _V3 , is exceeded, the transistor 805 is turned on and the charging indicator lamp 6 is turned off.
As a result, destruction of the indicator lamp 6 and transistor 801 can be prevented. This state is the uncontrolled light-off range shown in FIG. 4a.

In addition, when the generator 1 is generating electricity but the storage battery 4 is not charged due to a cause such as the first rectified output end 201 coming off, the first and second rectified output ends 201 and 202 are , the voltage waveform shown in FIG. 3 is output. At this time, as shown in FIG. 3, there is a period in which the voltage is equal to or _higher than the third predetermined value V3.

During this period, Zener diode 812 is conductive and transistor 810 is intermittently supplied with base current. However, due to the function of the capacitor 811, the transistor 810 is always conductive, and the charging indicator light 6 is turned on as in the case of no control. Next, when the wiring between the connection point of the key switch 5 and the charging indicator 6 and the collector of the transistor 701 is open, the key switch 5, the charging indicator 6, the diode 815, and the resistor 80 are connected from the storage battery 4.
A base current flows through the transistor 801 through the transistor 801. By supplying the current, the transistor 80
1 becomes conductive and lights up the charging indicator light 6. FIG. 4 shows the lighting state of the charging indicator lamp 6 with respect to the voltage of the second rectified output terminal 202. It should be noted that even if the diagnostic device 8 is configured as a circuit using a comparator, it will achieve the same effect as in the above embodiment.

As detailed above, in this invention, no power generation, no control, and
Since the charging indicator light is turned on when an abnormality such as disconnection of the first rectified output end is detected, the A point voltage is always at the second predetermined value when no power is being generated.
Detection can be made by setting the value so that _V2 or less. In addition, a third predetermined value V ₃ is set to detect non-control, and if the first rectified output edge is off, the detection is performed using the fact that the third predetermined value V ₃ is exceeded for a certain period of time. Detected.

As a result, it is possible to prevent the battery from running out when there is no power generation or when the first rectified output end is off, and there is an effect of preventing overcharging of the storage battery, destruction of the electric load, and failure when there is no control. Further, a fourth predetermined value _V4 is provided,
The charging indicator lamp is turned off, which has the effect of protecting the indicator lamp etc. from destruction.Furthermore, since an abnormality can be detected and displayed with a simple circuit configuration, there is also the effect that the device can be made small and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing a conventional device, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is a first and second rectified output when the first rectified output end 201 is off during power generation. These are the voltage waveforms at the ends 201 and 202. FIG. 4 is a characteristic diagram showing the operating state of the charging indicator lamp 6 with respect to the voltage of the second rectified output terminal 202. 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 switchgear, and 8 is the diagnostic device. ,801,805,81
0 is a transistor, 807, 808, 809 are first, second, and third resistors, 806, 812 are Zener diodes, V ₁ is a first predetermined value, V ₂ is a second predetermined value, and V ₃ is a The third predetermined value, _V4 , is the fourth predetermined value. 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 a rectifier that 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 an output voltage of the generator being adjusted by intermittent current flowing to the field coil; a voltage regulator for controlling the voltage to a predetermined value of 1; a charging indicator connected in series between the storage battery and the ground terminal via a key switch; When the magnetic coil is disconnected, the voltage at the second rectified output end is set to the first voltage.
a switching device that sets the voltage to a second predetermined value or less, which is lower than a predetermined value of It constitutes a voltage divider circuit that detects the voltage generated at the terminal, and is driven by the voltage at the connection point of the first, second, and third detection resistors connected in series, and the voltage at the connection point of the first and second resistors. a non-power generation detection circuit that turns on the indicator light when the second rectifier output terminal voltage is equal to or lower than the second predetermined value; an uncontrolled detection circuit equipped with a detection transistor that is activated when a predetermined value of When the indicator light is turned on and the voltage at the second rectified output end increases to exceed a fourth predetermined value higher than the third predetermined value, the increase in the connection point potential causes the indicator light to be turned on. A charging generator control device characterized in that the light is turned off again.