JPS6032428B2 - Power generation control device for vehicle generators - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power generation control device for a vehicle generator, and in particular, to a power generation control device for a vehicle generator, in particular, an excitation circuit that connects a voltage detection terminal, a generator output terminal, and an excitation winding of the generator to ground via a switching element is disconnected. The invention relates to a device that can notify the user of the

Usually, this type of device uses a double sensing method for the voltage detection terminal or the dashed line of the generator output terminal, as in Japanese Utility Model Publication No. 52-50327 and Hakama Publication No. 51-14 Iso No. 5. Yes, battery terminal voltage (1st
voltage detection point) and the generator voltage (second voltage detection point).

First, when the voltage detection line (first voltage detection line) is disconnected, the voltage detection point automatically moves to the second voltage detection point, but no particular display is performed. Also, when the generator output terminal is opened, the voltage detection point ' or the second voltage detection point is moved, but no particular display is given. Furthermore, regarding disconnection in the excitation circuit, a configuration is known in which a resistor for detecting disconnection is inserted between the output terminal of the second rectifier circuit 6 and the ground, and when the excitation circuit is disconnected, the power generation indicator is driven via the resistor. , there are some that display a disconnection display. In the case of conventional double sensing, in which the voltage detection terminal is simply taken out from the battery terminal and generator output terminal, control is performed using the battery terminal voltage during normal operation, and on the other hand, when the output terminal wire is disconnected or the voltage drop in the output terminal wire is large. In order to sometimes control the voltage at the generator output terminal, the battery detection terminal voltage was set to be optimal for battery charging, and the voltage at the generator output terminal was set slightly higher.

Assuming that the set voltage difference is VR, if this voltage difference VR is set relatively small and the voltage drop of the output terminal line becomes large, the voltage regulator will adjust the output terminal voltage of the generator when it exceeds VR. Since control starts at , this creates an unfavorable situation for battery charging. Furthermore, when VR is set relatively large, the generator will be controlled at a high voltage when the output terminal line or battery voltage detection line is opened, which may lead to burnout or damage to the electrical load. Also,
Even if the output terminal opens, the power generation indicator light will not give any warning to the driver, so if the vehicle continues to drive, the battery will run out and the vehicle will malfunction on the road, which is a serious problem. In addition, if a disconnection detection resistor is used between the L terminal and the ground terminal to detect a disconnection in the excitation circuit, in order to ensure a certain level of lamp brightness at the time of disconnection, this disconnection detection resistor must be a small resistance. It has to be set to a certain value, and under normal conditions, completely unnecessary heat generation (energy loss) occurs.

According to an experiment conducted by the present inventors, a resistance for detecting disconnection of approximately 100 Ω is required to ensure lamp brightness in the event of disconnection, and during normal power generation, the heat generated exceeds 22 W. For this reason, the disconnection detection resistor becomes large, which not only causes a big disadvantage in terms of installation or thermal protection, but also requires a large-capacity element for each diode because the disconnection detection resistor is connected as an electrical load of the second rectifier circuit. Not only does it require the use of a resistor, but it also has the disadvantage that the effective output of the generator is reduced by the current consumed by the resistor. The present invention has been made in view of the above points.

The first invention is to enable a driver to be notified when a failure such as a disconnection accident occurs in the excitation circuit of a generator by using a display means for displaying charge, and to notify the driver of the occurrence of a failure such as a wire breakage accident in the excitation circuit of a generator, and when the power generation is normal. It is configured to minimize power consumption by the control current-carrying resistor, and the power capacity of this resistor can be set much smaller than before, and its size and shape can also be miniaturized, making it advantageous to use an IC. And during normal power generation, the second
Since the output of the rectifier circuit can be used almost exclusively for excitation, the power generation output can be increased, and furthermore, the power generation can be forcibly stopped when the battery voltage detection line is disconnected, and this can be notified using the display means. The purpose of the present invention is to provide a power generation control device for a vehicle generator. Therefore, in the present invention, a series circuit consisting of a resistance for forming a current-carrying circuit and a switching means is provided between the output terminal of the second rectifier circuit of the on-vehicle generator and the ground, and the voltage at the output terminal of the second rectifier circuit is always maintained. A circuit for monitoring the power generation status of the generator and a display means for displaying according to the voltage of the generator are provided, and a circuit for monitoring the voltage input from the battery voltage detection line is also provided. When the detection is detected, the switching means is made conductive to form an energizing path from the battery through the key switch and the energizing resistor, and a predetermined voltage is applied to the output terminal of the second rectifier circuit to operate the display means. Due to this, the generator may malfunction, etc.
In particular, if the excitation circuit or battery voltage detection line is disconnected, the driver can be reliably notified of the disconnection.

Furthermore, in the second invention, in addition to the requirements of the first invention, an overvoltage protection function is added that forcibly stops power generation when the output voltage of the generator exceeds a set value. It is an object of the present invention to provide a power generation control device for a generator for a vehicle, which can sometimes quickly suppress power generation to protect various devices, and can notify the driver of this by commonly using the display means.

FIG. 1 shows an example of an outline of a vehicle generator.

Reference numeral 1 denotes a generator driven by an on-vehicle engine (not shown), which in this case generates a DC output obtained by rectifying a three-phase AC voltage through a Y connection.

2 is block 1 showing the power generation control device which is the main part of the present invention.
, 2, 3 is an armature winding, 4 is an excitation winding for excitation of the generator, 5 is a first rectifier circuit for full-wave rectification, and 6 is a second rectifier circuit that takes out the power for driving the excitation winding. , 7 is the excitation winding 4
8-1 is a battery voltage detection circuit that detects the charging pressure of the battery; 8-2 is an S terminal disconnection detection circuit that detects whether the battery voltage detection line is disconnected or open; 9; A generator voltage detection circuit detects the generator output voltage, and generates a signal depending on whether the output voltage exceeds a set value.

10 is a hold circuit, which receives a signal from the S terminal disconnection detection circuit 8-2 when the battery voltage detection terminal is disconnected, and from the generator voltage detection circuit 9 when the power generation output terminal is opened. (or once the signal is given) it generates a signal that turns off the output transistor in the switching circuit 7.

Reference numeral 11 denotes an alarm circuit, which drives a lamp 14 serving as a display means to give a warning to the driver when the excitation circuit (that is, including the excitation winding, output stage circuit, etc.) is disconnected.
Next, a specific embodiment of the power generation control device 2 is shown in FIG. 2, and will be described below.

First, the switching circuit 7 includes a Darlington transistor 71, a flywheel diode 72, and a resistor 73, and the excitation coil 4 and the flywheel diode 72 for absorbing back electromotive force are connected to the collector side of the switching circuit 7. The other end of the excitation coil 4 is connected to the output terminal L of the excitation diode 6, and the other end of the flywheel diode 72 is also connected to the L terminal. Further, the base of the Darlington transistor 71 is connected to the L terminal via a resistor 73. In addition, the battery voltage detection circuit 8
-- is the resistor 8 that divides the battery voltage from the S terminal.
4, 85, 86, and a constant voltage diode 83,
When the terminal voltage exceeds a certain set value, the constant voltage diode is turned on, the control transistor 81 is turned on, and the Darlington transistor 71 is turned off. Also,
The S terminal disconnection detection circuit 8-2 includes a transistor 82 and resistors 87 and 88, and is configured to operate the hold circuit 10 when the S terminal is disconnected or opened. It consists of a generator voltage detection circuit 9, resistors 91 and 92, and a constant voltage diode 93, and when the generator output voltage exceeds a set value, the constant voltage diode is turned on and a hold circuit 1 signal is generated. Further, the hold circuit 10 includes transistors 101,
102, 103, 104, 105, diode 106,
and resistance 107, 108, 109, 1091, 1092
, 1093, and the control transistor 81 is
Turn ON (generates a signal).

Also, once the hold state is reached, turn the key switch OFF.
It will not be released until it is FF. The alarm circuit 11 mainly includes a power generation detection circuit that detects the power generation state of the generator, and a drive circuit that drives the lamp 14 when a failure occurs. Among them, the power generation detection circuit includes transistors 111,
112, constant voltage diode 114, resistor 118, 119
, 1181, 1191, and capacitors 15, 116
It consists of an oscillation circuit called an astable multipipulator. Further, the drive circuit includes a transistor 113,
It consists of an energizing resistor 117 for detecting disconnection and driving the lamp, and a base resistor 1171. Its function is to lower the L terminal voltage to a low level and operate the charge indicator lamp 14 when the excitation circuit is disconnected. Next, to explain the operation of this voltage adjustment circuit, when the key switch 15 is turned on, since the generator 1 is not yet generating electricity, no voltage appears at the output terminal L of the second rectifier circuit 6, and the voltage is lower than the battery 16. , lamp 1
4 and the initial excitation resistor 12, current flows to the control circuit, and the transistor 71 is turned on. Then, the lamp 14 is turned on and the excitation winding 4 is initially excited. after that,
The generator is started and power generation starts, and the second rectifier circuit 6
When a voltage approximately equal to the terminal voltage of the battery 16 is generated, the potential difference between both ends of the lamp 14 becomes smaller and the lamp 14 turns off. When the generated voltage further increases, the battery voltage increases due to the charging operation, and when it exceeds a predetermined value, the voltage regulator diode 83 becomes ○N, the transistor 81 becomes ○N, and the transistor 71 becomes ○N.
FF is turned on to stop energization and excitation of the excitation winding 4. Therefore, the generated voltage decreases, and when the battery voltage becomes lower than a predetermined value, the voltage regulator diode 83 is turned off again.
The transistor 81 is turned off, and the transistor 71 is turned on, and energization and excitation of the excitation winding 4 are started. Thereafter, the above operation is repeated to adjust the charging voltage of the battery 16 to the predetermined value (usually 14 to 15 V) determined by the Jenner voltage or the like. Next, the alarm circuit 11 when the excitation circuit is disconnected, which is the first main part of the present invention, will be explained.

First, when the excitation circuit is normal, when the key switch 15 is turned on, the transistor 71 is turned on and the voltage at the output terminal L of the second rectifier circuit 6 is set to a predetermined partial voltage value lower than the battery voltage, so the oscillation circuit is activated. Due to the circuit settings, the constant voltage diode 114 cannot be turned on and oscillation does not occur. Therefore, the transistor 113 is turned on. Of course, lamp 14
is lit. In this state, when the engine is started and the generated voltage rises to approximately the battery voltage, the lamp 14 is turned off. At this time, the oscillation circuit is supplied with sufficient voltage from the second rectifier circuit 6, so the constant voltage diode 114 turns on and starts oscillating, and the transistor 113 is turned on and off according to its oscillation cycle. . At this time, the actual power consumption by the resistor 117 is set to be minimized by reducing the duty ratio when the transistor 13 is turned on. Now, if the power generation operation of the generator 1 is stopped due to, for example, a disconnection of the excitation winding 4 or the transistor 71 in the excitation circuit, a predetermined voltage will no longer be generated at the output terminal L' of the second rectifier circuit 6.

In this case, the oscillation circuit attempts to continue oscillating with the voltage supplied from the battery 16 through the key switch 16 and the parallel circuit of the lamp 14 and the initial excitation resistor 12, but when the transistor 113 becomes conductive, the output terminal L The voltage is approximately the value obtained by dividing the battery voltage by the parallel resistance of the lamp 14 and the initial excitation resistance 12, and the resistance 117 for detecting disconnection. Due to this total voltage drop at the output terminal L, the constant voltage diode 114 in the oscillation circuit cannot be turned on, and therefore the oscillation operation of the oscillation circuit is stopped with the transistor 112 being OFF and the transistor 111 being ON. Therefore,
The transistor 113 continues to be in the ON state, and the key switch 15, the lamp 14 and the resistor 11 are controlled by the battery voltage 11.
The lamp 14 is turned on in route 7 to immediately notify the driver that the generator has failed. Of course, if the key switch 15 is opened and then turned on again, the lamp 14 will continue to light up since the transistor 603 will continue to be in the ON state even after the engine has started, thereby informing the driver of a power generation failure. According to experiments conducted by the present inventors, the current-carrying resistance 117
Even if you select 5 to 100, the duty ratio when the transistor 113 is turned on by the oscillation circuit will be 1/50 to 1/100.
By selecting , the power consumption of this resistor 117 can be reduced to 0.2 to 0.3 W during normal power generation, and 2 to 0.3 W during disconnection failure.
It was confirmed that the power consumption can be reduced to 3W or less, which is less than 1/10 of the conventional power consumption. Next, the second feature of the present invention, which is the power generation stop and alarm function when the charging line between the generator output terminal and the battery terminal is disconnected, will be explained. When the generator output terminal is opened, the B terminal voltage and the L terminal voltage, which are the output voltages of the generator, become negative high voltages.
33 is turned on, the transistor 03 is turned on, and the hold circuit 10 is activated.

That is, the ON state of the transistor 103 is held by turning on the transistor 103 and turning on each of the transistors 101 and 102. On the other hand, when the transistor 102 is turned on, the transistors 04 and 105 are turned on and the control transistor 81 is turned on, so that the output stage transistor 71 is forcibly turned off to stop power generation. When power generation stops, the potential of the L terminal voltage is grounded via the transistor 113 by the resistor 117 in the alarm circuit 11, so that it falls to a predetermined partial voltage value, and the lamp 14 operates to give a warning to the driver. This alarm continues until the key switch 15 is once turned off. Next, the power generation display and alarm function of the generator when the battery voltage detection line is disconnected, which is the third main part of the present invention, will be explained.

When the battery voltage detection line is opened, no voltage is applied to the base of the transistor 82 in the S terminal disconnection detection circuit 8-2, and the transistor 82 is turned off.

Then, a base current flows to the transistor 103 through the resistors 87 and 88, turning on the transistor 03. Therefore, the hold circuit 10 is activated, the transistor 105 continues to be turned on, the transistor 81 is turned on, and the output stage transistor 71 is turned off and power generation is stopped. When power generation stops, the alarm circuit 11 operates as described above, lights up the lamp 14, and gives a warning to the driver. In this circuit, this alarm continues until the key switch 15 is once turned off. next,
FIG. 3 shows another embodiment of the present invention, in which the excitation circuit (
This is a combination of a display when the excitation winding 4 and the transistor 71) are disconnected, and a power generation stop and display when the battery voltage line is disconnected.

The difference from the embodiment shown in FIG. 2 is that the hold circuit 10 is omitted, and in particular, when the battery voltage detection line is once removed and the connection returns to normal again, power generation is started at the same time, and the alarm is not held. This is what I did. Note that the circuit operation is the same as that of the circuit shown in FIG. 2, so a description thereof will be omitted. Further, in the above-described embodiment, a lamp was directly inserted in series between the key switch 15 and the terminal L as the display means 14, but instead of the lamp 14 as the display means 14-1, for example, as shown in FIG. A relay coil 1401 and a backflow prevention diode 1402 may be inserted, and the lamp 1403 may be driven by opening and closing the relay terminal of the relay coil 1401.

Of course, the lamp 1403 may be driven using a semiconductor relay instead of the mechanical relay described above.
In this case, the lamp 1403 can also be replaced with another alarm element such as a light emitting diode or a buzzer. As described above, the device of the present invention adds an alarm circuit 11 and various protection circuits to a voltage regulating circuit similar to the conventional one, and converts both circuits into an integrated circuit device using thick film technology, thin film technology, etc. Therefore, the input/output terminals of this integrated circuit device can be the same number of terminals (L, F, S, E) as in the case of only the conventional voltage adjustment circuit, and the dimensions and shape of the device of the present invention are also different from the conventional ones. It can be made as small as possible, and therefore can be installed in a way that is compatible with current power generation control devices.

As described above, in the first invention, the voltage at the output terminal of the second rectifier circuit of the generator is monitored, and when at least a power generation failure is detected, the display means for indicating charging is energized through the energizing resistor. It is driven according to the terminal voltage of the second rectifier circuit output terminal formed by the excitation resistor, and on the other hand, during normal power generation, the current flow through this thin resistor is substantially stopped, so that breakage of the excitation circuit may occur. At times, this can be notified to the driver using the display means, and during normal power generation, the power consumption by the current-carrying resistor can be minimized, so the power capacity of this resistor can be small, and its size and shape can be reduced to 4・It has the excellent effect of further increasing the power generation output because it can be made into a different model, and most of the output of the second rectifier circuit can be used exclusively for excitation during normal power generation. In addition, when the battery voltage detection line is disconnected or opened, power generation is forcibly stopped, and the display means can be used to notify the driver of this fact, which is an excellent effect. In addition, the second invention has all the effects of the first invention, and in addition, when the output voltage of the generator exceeds a set value, power generation is forcibly stopped, and the display to that effect is displayed. This has the excellent effect of being able to notify the driver using a common means, and has the excellent effect of providing a more reliable power generation control device than the conventional one.

[Brief explanation of drawings]

FIG. 1 is an overall circuit diagram showing one embodiment of the device of the present invention, and FIG.
3 and 4 are electrical circuit diagrams showing specific examples of the apparatus of the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Generator, 2... Power generation control device, 3... Armature winding, 4... Excitation winding, 5... First rectifier circuit, 6...
・Second rectifier circuit, 8-1...Battery voltage detection circuit, 8-2...S terminal disconnection detection circuit forming the main part of the protection circuit, 9...Generator forming the main part of the overvoltage protection circuit Voltage detection circuit, 10... Hold circuit, 71... Darlington transistor forming a switching element for controlling the generated voltage, 112, 114... Transistor forming a main part of the power generation detection circuit, constant voltage diode, 113, 117...
・Transistors and current-carrying resistors that form the main parts of display drive circuits. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A vehicle generator is provided with a first rectifier circuit and a second rectifier circuit, a first rectifier output terminal of the first rectifier circuit is connected to a battery, and a first rectifier output terminal of the second rectifier circuit is connected to a battery. A second rectifier output terminal is connected to the battery via a key switch and is also connected to a switching element for controlling the generated voltage via an excitation winding. In a power generation control device for a vehicle generator in which the switching element is controlled according to a terminal voltage, there is a disconnection detection device that detects a voltage that is supplied from the second rectified output terminal and decreases due to disconnection of the battery voltage detection line. a protection circuit comprising a circuit and a hold circuit for forcibly shutting off the switching element by an output signal from the disconnection detection circuit, and a display means connected between the second rectified output terminal and the battery. and a current-carrying resistor whose one end is connected to the second rectifier output terminal, detects the terminal voltage of the second rectifier output terminal voltage, and when the terminal voltage is equal to or higher than a predetermined level, generates a pulse-shaped resistor. It has a power generation detection circuit which emits an output signal and which emits a constant level output signal when the terminal voltage is below a predetermined level. A power generation control device for a vehicle generator, comprising a display drive circuit that connects the other end of the current-carrying resistor and ground intermittently or continuously according to a signal. 2. The device further comprises an overvoltage protection circuit that forcibly cuts off the switching element when power is supplied from the second rectified output terminal and the voltage of the second rectified output terminal exceeds a set value. A power generation control device for a vehicle generator according to claim 1.