JPH0345614B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a function of detecting that the output terminal of a generator is open and outputting an alarm signal while controlling power generation according to the generator voltage. The present invention relates to a charging device.

[Conventional technology]

In a power supply device that combines a generator and a battery to drive a load, if the generator output terminal is disconnected, the load is driven only by the battery, so the battery voltage gradually decreases, and eventually the load It stops working. Particularly in a car charging device, if the output terminal of the generator is disconnected, the car will be left with a battery after a predetermined period of time, and the car will become unable to run.

Therefore, as shown in Japanese Unexamined Patent Publication No. 56-3540, a device is known that issues an alarm when the terminal becomes disconnected to call the driver's attention.

[Problem to be solved by the invention]

However, in the conventional device described above, when the terminal is disconnected, instead of detecting the battery voltage, the voltage of the generator is detected and the voltage of the generator is controlled to a predetermined voltage. However, the above predetermined voltage is
During normal operation (when the terminals are not disconnected), the set voltage for power generation control should be increased (approx.
20V).

In particular, when the generator rotates at low speed, a large amount of current flows through the excitation coil, causing heat generation and damage to the excitation coil.

[Means to solve the problem]

Therefore, the present invention provides: a generator having an armature coil and an excitation coil; a battery charged by the output of the generator; a switch means for conducting or cutting off a current flowing through the excitation coil; and a voltage of the battery. a first voltage control means that conducts or cuts off the switch means in order to detect the battery voltage and maintain the battery voltage at a first control voltage; a second voltage control means for maintaining the output of the generator at a second control voltage through the switch means; detecting the voltage of the battery; a determination means for determining that the voltage has reached a third voltage lower than the first control voltage, and the second voltage control means, when the second control voltage is controlling the output of the generator, When the battery voltage becomes equal to or lower than the third voltage by the determining means, the second
switching means for switching the control voltage of the battery voltage to a fourth control voltage lower than the second control voltage;
and an alarm means for giving an alarm when the voltage reaches the voltage equal to or lower than the second control voltage and the output of the generator is equal to or higher than the second control voltage.

[Effect]

When the battery voltage decreases and this battery voltage is lower than the third voltage, a disconnection alarm is reliably issued, and the output voltage of the generator is lowered to the fourth control voltage. prevent current from flowing.

〔Effect of the invention〕

As described above, in the present invention, it is detected that when the generator output terminal is disconnected, the generator output voltage increases to the second control voltage, while the battery voltage decreases to the third voltage or lower. However, by controlling the output voltage of the generator by switching from the second control voltage to the fourth control voltage, heat generation of the excitation coil is prevented, and by giving an alarm by the alarm means based on these detections, This has the excellent effect of reliably suppressing the power generation of the generator, preventing damage to the excitation coil, and alerting users of malfunctions such as disconnected terminals.

〔Example〕

An electrical wiring diagram of an embodiment of the present invention is shown in FIG. 1 is an alternating current generator; 2 is an output winding; 3 is an excitation winding; 4 is a generator assembly; The output is supplied to the battery 40 and the load. 12 is a regulator, 1
3, 14, 15, 16 and 51 are diodes, 1
7, 18, and 19 are transistors, 20 is a capacitor, 21, 22, 23, and 50 are first to fourth comparators, 24 and 25 are OR circuits, and 26 is a capacitor.
The AND circuit 27 is an open collector type switching circuit, and as an example shown in Fig. 2, the input 27a
When there is an L level signal at the input 27a, an L level signal is output to the output 27b, and when there is an H level signal at the input 27a, the output 27b is in an open state. 28, 29, 31, 33, 34,
35, 36, 37, 38, 39 and 52, 53 are resistors, 40 is a battery, 41 is a key switch,
42 is an indicator light, and 100 is a constant voltage circuit. Each of the circuits 21 to 27 also includes a constant voltage circuit 100.
It is assumed that a more constant voltage is supplied.

The operation of the above configuration will be explained. When the key switch 41 is turned on and an engine (not shown) is started, the generator 1 rotates because it is connected to the engine.

Here, the transistors 17 and 18 and the Zener diode 14 are a known regulator circuit, and when the voltage of the battery 40 is lower than a set value (first control voltage), the Zener diode 14 is not conductive and the transistor 18 is turned off. The transistor 17 is turned on, causing an excitation current to flow through the excitation winding 3, thereby increasing the output of the generator 1.

Further, when the voltage of the battery 40 becomes higher than the first control voltage, the Zener diode 14 is turned on, the transistor 18 is turned on, and the transistor 17 is turned on.
is turned off and the output of generator 1 is reduced. By repeating the above operations, the voltage of the battery 40 is maintained at the first control voltage.

By the way, the comparator 21 detects the voltage of the output winding 2 of the first phase of the generator 1. Immediately after the key switch 41 is turned on, when the generator 1 is in the last generation state, the first comparator 21 output is at high level
The transistor 19 is turned on via the OR circuit 25. As a result, the indicator light 42 lights up to indicate that the generator 1 is not generating power. When the generator 1 starts generating electricity and its output voltage increases and reaches a predetermined value, the output of the first comparator 21 becomes a low level,
The indicator light 42 is turned off.

Now, due to some reason, such as vibration, the output terminal 1
If 1 is disconnected or disconnected, battery 4
Since a voltage of 0 is not charged, the voltage gradually decreases depending on the amount of discharge to an electrical load (not shown). Therefore, since the battery voltage is low, the transistor 17 continues to be on, and as a result, the output voltage of the generator 1 rises rapidly.

However, the output voltage from generator 1 is AND
Since the output 27b of the circuit 26 and the switching circuit 27 is at L level when there is no disconnection or disconnection of the terminals, it is grounded through the resistor 30, and connected to the input of the comparator 50 through the diode 16 and the resistor 31. The output of the comparator 50 has been at a low level until now, but now repeats high and low levels, and as a result, the output of the generator 1 is at a second control voltage higher than the first control voltage. It will be controlled by voltage. Therefore, the output voltage of the generator 1 is prevented from increasing abnormally.

Further, since the output voltage of the generator 1 has increased, the output of the second comparator 22 becomes a high level, and the output of the OR circuit 24 also becomes a high level. Further, since the voltage of the battery 40 is lower than the third voltage set by the resistors 37 and 38, the third comparator 23 outputs a high level output. As a result, the output of the AND circuit 26 becomes high level, turning on the transistor 19,
The indicator light 42 is turned on to indicate that the battery 40 is not charged.

In addition, until now, the output of the generator 1 has been measured by a comparator 50.
The output of the AND circuit 26 becomes high level, and the output of the switching circuit 27 turns off (open state), and the resistor 30 and diode 15, transistors 18 and 17 are controlled via the Zener diode 14, and the comparator 5
The output of generator 1 remains at a low level, and the output of generator 1 is controlled by a fourth control voltage lower than the second control voltage, suppressing the output of generator 1 and reducing the current flowing to excitation winding 3. can limit and suppress heat generation.

Furthermore, in this case, since the output of the AND circuit 26 is fed back to the OR circuit 24, when the output of the AND circuit 26 becomes a high level, even if the output of the generator 1 decreases, the output of the AND circuit 26 is fed back to the OR circuit 24.
output continues to maintain a high level. As a result, the indicator light 42 continues to be lit during driving, and it is possible to effectively notify the driver.

In the embodiments described above, the indicator light 42 is used to warn of disconnection of the generator output terminal, poor contact, etc., but the same effect can be obtained by other means, such as a buzzer.

[Brief explanation of drawings]

FIG. 1 is an electrical wiring diagram showing an embodiment of the present invention;
FIG. 2 is an electrical wiring diagram showing an example of the switching circuit shown in FIG. 1. 1... AC generator, 4... Generator assembly, 12... Regulator, 40... Battery,
42... Indicator light.

Claims (1)

[Scope of Claims] 1. A generator having an armature coil and an excitation coil, a battery charged by the output of the generator, a switch means for conducting or cutting off a current flowing through the excitation coil, and a voltage of the battery. a first voltage control means for detecting the battery voltage and turning on and off the switch means to maintain the battery voltage at a first control voltage; a second voltage control means for maintaining the output of the generator at the second control voltage through the switch means; detecting the voltage of the battery; a determining means for determining that the voltage has reached a third voltage lower than the first control voltage; and the second voltage control means, when the output of the generator is controlled by the second control voltage. , when the battery voltage becomes equal to or lower than the third voltage by the determining means, the second
switching means for switching the control voltage of the battery voltage to a fourth control voltage lower than the second control voltage;
an alarm means for giving an alarm when the voltage reaches the voltage equal to or lower than the second control voltage and the output of the generator is equal to or higher than the second control voltage.