JPH0727806Y2 - Vehicle power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vehicle power supply device, and more particularly to a vehicle power supply device used in a motorcycle or the like.

[Conventional technology]

Generally, a power supply device such as a motorcycle is operated by being powered by a drive shaft of an engine, and the output of the power supply device is rectified and then stored in a battery. The output of the battery drives various loads such as an engine ignition device, headlights, and blinkers.

A conventional example of such a power supply device is shown in FIG.

In FIG. 2, the output of a three-phase generator (for example, a magnet type AC generator) 1 connected to a drive shaft of an engine (not shown) consists of diodes D1, D2, D3, D4, D5, D6. It is rectified by the three-phase double-wave rectifier 2, and the rectified output is applied to the overvoltage detection circuit 3A of the voltage regulator 3.

The overvoltage detection circuit 3A comprises a diode D7 and a Zener diode DZ, and the ground side of this Zener diode DZ is further branched to reach the gates of the thyristors SC1, SC2, SC3. The anodes of the thyristors SC1, SC2, SC3 are connected to the cathode side of the diodes D4, D5, D6 in the rectifier 2, and the cathodes of the thyristors SC1, SC2, SC3 are grounded. The output of the rectifier 2 is applied to the battery 5 via the circuit breaker 4 including the overvoltage detection unit OV and the trip contact NC, and the battery 5 is charged thereby. Here, the circuit breaker 4 is provided to prevent damage to the battery 5 due to overcharge.

The output of the battery 5 is configured to be supplied to the headlight 7, the intermittent load 8 such as a blinker, and the ignition device 9 of the engine via the main switch 6. That is, the headlight 7 is connected to the main switch 6 via the fuse 11 and the switch 14, the intermittent load 8 is connected to the main switch 6 via the fuse 12 and the switch 15, and the ignition device 9 is connected to the main switch 6 via the fuse 13 and the switch 16. .

Therefore, when the switch 16 is turned on after the main switch 6 is turned on, the ignition device 9 is activated and the engine operates. As a result, the generator 1 starts operating and its output voltage is applied to the battery 5. here,
The terminal voltage of the battery 5 is monitored by the overvoltage detection circuit 3A.

In this state, the terminal voltage of the battery 5 is the overvoltage detection circuit 3A.
Consider the case where the voltage exceeds the rated voltage set by the Zener voltage of the Zener diode DZ in the
DZ is turned on and its anode output is thyristor SC1,
It is added to the gate terminals of SC2 and SC3. As a result, the thyristors SC1, SC2, SC3 are turned on.

As a result, the half-wave component of the rectifier 2 is sunk to the ground, the effective value of the output voltage decreases, and the terminal voltage of the battery 5 decreases accordingly.
Is turned off and the thyristors SC1, SC2, SC3 are also turned off, and the output of the rectifier 2 is restored.

By repeating such operations, the terminal voltage of the battery 5 is controlled to a predetermined value.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technique, the load variation of the vehicle is generally quite large, so that the following problems occur.

That is, when the load suddenly changes from the maximum load to the minimum load, the terminal voltage of the battery 5 generally greatly increases, which causes the circuit breaker 4 to operate and open the charging circuit for the battery 5. There is.

In such a case, when viewed from the generator 1 side, the charging load on the battery 5 is eliminated, so that the load of the generator 1 is further reduced. Therefore, the terminal voltage of the generator 1 is rapidly increased and the Zener diode DZ is turned on. Thyristor SC1, SC2,
Since SC3 is turned on, the output of the rectifier 2 decreases as described above. In this case, the igniter 9 has a rectifier 2
Since the output voltage of the rectifier 2 is directly applied as the drive voltage, it becomes impossible to supply sufficient energy for igniting the spark plug of the engine when the output of the rectifier 2 decreases, and as a result, the operation of the ignition device 9 There was an inconvenience that the engine stopped when the engine stopped.

[Purpose of device]

The present invention improves the disadvantages of the conventional example, in particular, reduces the fluctuation of the output to the engine side even when the circuit breaker for protecting the battery is activated, and at the same time effectively continues the operation of the ignition device. It is an object of the present invention to provide a vehicle power supply device that enables the above.

[Means for solving problems]

According to the present invention, an engine generator 1 that is driven by an engine to operate, a battery 5 that stores the output of the engine generator 1 via a rectifier 2 and a circuit breaker 20, and stores the voltage, and a terminal voltage of the battery 5 are predetermined. A voltage regulator 3 for setting and controlling the value, a headlamp 7 that functions by inputting the output of the engine generator 1, a load such as an engine ignition device, and the circuit breaker 20 are normally connected to the battery 5. And a battery connection terminal that opens the connection state with the battery 5 when the vehicle-mounted load connected to the battery 5 suddenly decreases, and an open terminal that is selectively connected when the battery connection terminal is opened. Have And
The open terminal of the circuit breaker 20 is connected to the indicator lamp 22, and the open terminal of the circuit breaker 20 is connected to the input end of the headlamp 7 via the backflow prevention diode 21. This aims to achieve the above-mentioned object.

[Action]

Due to the sudden decrease in load, the circuit breaker for battery protection opens the charging circuit for the battery. In this case, unlike the conventional example, the rectified output is supplied to the headlamp through the open terminal of the circuit breaker and the backflow prevention diode, so that the rectified output does not rise sharply and, as a result, the rectified output is unreasonable. Is no longer restricted to. Therefore, it becomes possible to continuously apply a sufficient voltage to the ignition device even when the load is rapidly reduced.

[Example of device]

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

FIG. 1 shows a vehicle power supply device according to an embodiment of the present invention. Here, in the figure, the same components as those in FIG. 2 described above are designated by the same reference numerals.

In the embodiment shown in FIG. 1, an engine generator 1 that is driven by an engine to operate, a battery 5 that inputs the output of the engine generator 1 via a rectifier 2 and a circuit breaker 20, and stores the battery, and this battery And a voltage regulator 3 for controlling the terminal voltage of No. 5 to be set to a predetermined value. Further, it is provided with a headlamp 7 which is turned on by inputting the output of the engine generator 1, and a lighting switch 14 which is provided between the headlamp 7 and the engine generator 1 and which is turned on / off by an external operation. The circuit breaker 20 has a headlamp energization control function that operates in conjunction with the opening operation of the power storage circuit for the battery 5 and applies the output of the engine generator 1 to the headlamp 7 regardless of the operation of the lighting switch 14. There is.

More specifically, in FIG. 1, the circuit breaker 20 is
It is composed of an overvoltage detection unit OV that monitors the terminal voltage of the battery 5, and a switch SW that is interlocked with the overvoltage detection unit OV and that connects the battery 5 and the rectifier 2. And
The normally closed contact (battery connection terminal) b of the switch SW is to the battery 5, and the normally open contact (open terminal) of the switch SW.
a is connected to the voltage application side 7 of the headlamp via the backflow prevention diode 21. Further, between the interconnection point of the diode 21 and the normally open contact a and the ground, an indicator lamp indicating that the circuit breaker 20 is in the open operation.
22 is connected.

Others are the same as those in FIG. 2 described above.

Consider the case where the load is abruptly changed, the terminal voltage of the generator 1 is abruptly increased, and the circuit breaker 20 is activated by the above configuration.

In this case, the switch SW switches from the normally closed contact b to the normally open contact a, whereby the output of the rectifier 2 is applied to the headlamp 7 and the headlamp 7 lights up, and
The indicator lamp 22 lights up, indicating that the circuit breaker 20 has opened.

Therefore, considering the load state of the generator 1, the battery 5
Although there is no charging load for the, the lighting load of the headlamp 7 and the indicator lamp 22 is added even when the switch 14 is not closed, so the load is large compared to the state before the breaker 20 is opened. It does not fluctuate, so that the terminal voltage of the generator 1 does not fluctuate significantly. Therefore, even in this case, the overvoltage detection circuit in the voltage regulator 3
Since the Zener diode DZ forming 3A does not turn on, the thyristors SC1, SC2, SC3 do not turn on and the output voltage of the rectifier 2 does not drop. As a result, sufficient voltage is supplied to the ignition device 9 to operate, and the engine is prevented from stopping.

[Effect of device]

As described above, according to the present invention, when the circuit breaker opens the battery storage circuit, the rectified output of the generator is connected to the headlamp through the backflow prevention diode.
It is possible to suppress the occurrence of a sudden decrease in the load current of the generator,
As a result, a sufficient voltage can be supplied to the ignition device even when the breaker is opened, and therefore, the worst case engine stop can be effectively avoided without separately installing a dummy load which is normally unnecessary. It is possible to provide a practical vehicle power supply device that is not possible in the past.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an apparatus according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional apparatus. 1 ... Generator, 2 ... Rectifier, 3 ... Voltage regulator, 5 ...
... Battery, 7 ... Headlamp, 20 ... Breaker, 21 ...
… Backflow prevention diode, 22 …… Indicator lamp, a
...... Normally open contact as an open terminal, b …… Normally closed contact as a battery connection terminal.

Claims (1)

[Scope of utility model registration request] 1. An engine generator 1 which is driven by an engine to operate, a battery 5 which stores an output of the engine generator 1 through a rectifier 2 and a circuit breaker 20 and stores electricity, and a terminal voltage of the battery 5. It is provided with a voltage regulator 3 for setting and controlling to a predetermined value, a headlamp 7 that functions by inputting the output of the engine generator 1, a load such as an engine ignition device, and the circuit breaker 20 is usually a battery 5. And a connection terminal for opening the connection state with the battery 5 when the vehicle-mounted load connected to the battery 5 suddenly decreases, and an opening selectively connected during the opening operation for the battery connection terminal. The indicator lamp 22 is connected to the open terminal of the circuit breaker 20, and the open terminal of the circuit breaker 20 is connected to the head lamp via the backflow prevention diode 21. A power supply device for a vehicle, which is connected to an input end of the pump 7.