JP2952372B2 - In-vehicle generator with welding function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator using a driving engine mounted on a vehicle as a driving source, and more particularly to a DC low voltage current required for vehicle operation and a high power equivalent to a commercial power supply such as a single-phase AC 100 V. The present invention relates to a vehicle-mounted power generator with a welding function that can stably supply a voltage alternating current and a DC power supply necessary for arc welding.

[0002]

2. Description of the Related Art Conventionally, as a power source for arc welding using a generator of an automobile, for example, Japanese Patent Application Laid-Open No. Sho 50-3634.
There is one shown in Japanese Patent Publication No. The technical content disclosed herein includes a switch for switching whether to supply the DC output of the generator to a normal regulator or to an outlet, and a battery different from the vehicle battery for the outlet. Are electrically connected in parallel to serve as a power source for arc welding, and a stable DC output is obtained during arc welding.

[0003]

However, in the above-mentioned method, the output of the outlet is a direct current. Therefore, when performing finishing work by a grinder or the like after welding, stable power is supplied to the grinder or the like. In addition, a separate AC 100 V power supply must be prepared, which causes a problem that the mounting weight of the vehicle increases, the fuel efficiency of the vehicle deteriorates, and the loading capacity of the vehicle decreases.

Further, when the switch is switched to the outlet side, the output voltage of the generator is connected to the vehicle battery via the resistor, so that the voltage applied to the vehicle battery is suitable for charging, for example. DC14-1
There is a problem that the voltage greatly exceeds the voltage range of 4.5 V and the vehicle battery is overcharged, and in the worst case, the vehicle battery is damaged.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and has a first stator coil for generating a high-voltage alternating current using a traveling engine for a vehicle as a drive source, and a low-voltage alternating current. And the first stator coil generating the
A generator having a field coil for generating a magnetic field acting on the second stator coil, a first rectifier for rectifying the output current of the first stator coil, and an output current of the second stator coil. The second and third rectifiers for rectification and the output of the first rectifier are stabilized by a DC voltage stabilizing circuit and converted into a stabilized high voltage alternating current equivalent to a commercial AC power supply via an inverter circuit. An on-vehicle power generator with a welding function that uses the output of the second rectifier as a DC power source for welding and supplies the output of the third rectifier to a vehicle battery for traveling; An external output control means for interrupting the output of the high-voltage alternating current and a charge control means for interrupting the application of a charging current to the vehicle battery; When using the DC power supply for welding, the output of the high-voltage alternating current and the charging current are cut off to reduce the load on the generator, and when the DC power supply for welding is not used, Supplying a charging current to the vehicle battery while controlling the exciting current of the field coil so that the applied voltage of the vehicle battery becomes a voltage optimal for charging the vehicle battery, and interrupting the output of the high-voltage alternating current. The present invention is to provide a vehicle-mounted power generator with a welding function for canceling the above.

Further, the present invention provides a vehicle idle-up control means, and when the DC power source for welding is used, increases the output of the generator by increasing the rotational speed of a traveling engine for the vehicle. An object of the present invention is to provide a vehicle-mounted power generator with a welding function.

Further, the present invention is based on the operation of a welding switch which is integrally formed with a welding device and is electrically connected in series with a running engine start switch of a vehicle when a DC power supply for welding is used. Another object of the present invention is to provide an on-vehicle power generator with a welding function, in which at least one of the output of the high-voltage alternating current and the charging current is cut off.

[0008]

FIG. 1 shows a circuit configuration of an on-vehicle power generator with a welding function used in one embodiment of the present invention. The generator used in this embodiment is a general-purpose small vehicle-mounted generator 1,
The vehicle is driven by a traveling engine (not shown) for a vehicle and is disposed immediately adjacent to the traveling engine.

The generator 1 forms a three-phase output stator coil portion 1 'by connecting one end of a first stator coil 1a for generating an AC 100 V AC current in a Y-shape, and forms each winding of the stator coil 1a. A tap 1b is taken in the middle of the process, and this is used as a second stator coil for generating a three-phase low-voltage alternating current. Then, the other end of each stator coil 1a is connected to connection terminals 1c, 1d, and 1e provided on the generator 1, respectively, to provide AC three-phase high-voltage AC output terminals of 100V. The output of each tap 1b is also connected to the connection terminals 1f, 1g,
1h to make a three-phase low-voltage AC output terminal.

On the other hand, a field coil 1i for generating a magnetic field acting on the stator coil portion 1 'is provided.
One end of i is grounded to the housing of the generator 1, and the other end is connected to the connection terminal 1j. Then, a ground terminal 1k electrically connected to the housing of the generator 1 is provided.

FIG. 2 is a schematic circuit diagram of a vehicle-mounted power generator according to an embodiment of the present invention. In the figure, reference numeral 2a denotes a three-phase dual-wave rectifier for rectifying the output current of the three-phase AC 100V of the generator 1. The generator 1 and the rectifier 2a
And a contact portion 7a of a relay 7 described later for electrically interrupting conduction, and operates so as to cut off the circuit when an exciting current flows through a coil of the relay 7 as described later. I do. And, for example, as already proposed by the present applicant in Japanese Patent Application Laid-Open No. 1-259798,
The output of the rectifier 2a is stabilized via a DC constant voltage stabilizing circuit 2b, and a DC high voltage source 2 is formed by connecting a smoothing capacitor 2d in parallel. At this time, in order to secure a high-voltage alternating current output equivalent to the single-phase AC 100 V that is the output of the on-vehicle power generating device according to the present embodiment, the output voltage of the DC high voltage source 2 is changed to 2b ', and by controlling the collector-emitter current of the transistor which is the current control unit 2b "based on the voltage, the voltage value of the DC high voltage
It is controlled to be up to 140V.

Further, in the present embodiment, the output of the DC high voltage source 2 is supplied to the commercial single-phase 100 V AC by the inverter circuit 3.
Is converted to a rectangular wave-shaped alternating current having the same effective value as the power supply. That is, the inverter circuit 3 includes four switching elements Q1 to Q4 (transistors in the figure) and switching element protection diodes D1 to D4 connected in parallel and in opposite directions to the switching elements Q1 to Q4, respectively. Switching unit 3a and switching unit 3
a), which is composed of an inverter control unit 3b for controlling a.

In this embodiment, as shown in FIG.
By sequentially switching the switching elements Q1 to Q4 based on a control signal output from the inverter control unit 3b, the output of the DC high voltage source 2 is converted into a rectangular wave-shaped single-phase alternating current. This control method is the same as, for example, Japanese Patent Publication No. 7-46907 already proposed by the applicant of the present invention, in which the influence of the parasitic capacitance of the switching element under no load and the inductive load are controlled by the output terminal of the inverter circuit 3. T1, T
2 works very effectively in preventing the effect of the induced back electromotive force when connected to the second connection. The switching element is a power MOS
By using an FET, the ON resistance of the element can be reduced, the conversion efficiency can be increased, and heat generation can be suppressed to further reduce the size of the device. In this case, since the power MOSFET is structurally formed with a parasitic diode in the opposite direction in parallel, D1 to D4 may be excluded from the circuit.

The low-voltage three-phase AC output of the generator 1 is:
The DC power is rectified by the three-phase dual-wave rectifier 4 and supplied to the welding device 5. The welding device 5 includes a welding holder 5a that is electrically connected to an output on the plus side of the three-phase dual-wave rectifier 4 and holds a welding rod, a switch 5b, and a minus side of the three-phase dual-wave rectifier 4. 5 'which is electrically connected to the output of the switch 5'.
It is set to be. In the present embodiment, the switch unit 5b is electrically connected in series with a key switch 6 described later. When the key switch 6 is ON and the switch unit 5b is ON, the coil of the relay 7 When a current flows, the contact portion 7a is turned off,
The inputs of the thyristor control unit 11 and the vehicle idle-up control unit 13 to be described later become “H” level. However, when only the switch section 5b is off, the relay 7 is turned off, the contact section 7a is turned on,
A high voltage alternating current equivalent to the commercial AC 100 V can be output from the terminals T1 and T2, and the thyristor control unit 11
And the input of the vehicle idle-up control unit 13 becomes “L” level.

On the other hand, the low-voltage three-phase AC output of the generator 1 is:
The three-phase thyristor is supplied to the double-wave rectifier 8. At this time, when the input of the thyristor control unit 11 is “L” level, a thyristor control signal of “H” level is output from the thyristor control unit 11, and the low-voltage three-phase AC output is supplied to the three-phase thyristor double-wave rectifier 8. A current control circuit 12 that is rectified and supplied to the vehicle battery 9 and the vehicle electrical component 10 and that controls the excitation current of the field coil 1i of the generator 1 via the key switch 6 is electrically connected in series.

The current control circuit 12 is connected to the voltage detector 1
2a and a transistor which is a current control unit 12b. The output voltage of the three-phase thyristor double-wave rectifier 8 is detected by the voltage detection unit 12a.
Is an optimal voltage value for charging the vehicle battery 9 in the range of 14 to 14.5 V (when a 12 V battery is used).
The current controller 12b controls the current between the collector and the emitter of the transistor. still,
When the output voltage of the three-phase thyristor double-wave rectifier 8 is reduced to, for example, about 9 V DC, which is an obstacle to the running of the vehicle or the like, a function to cut off the excitation current flowing through the field coil 1i of the generator 1 is provided. This prevents the vehicle battery 9 from running out.

On the other hand, when the input of the thyristor control unit 11 is "
In the case of the "H" level, a "L" level thyristor control signal is output from the thyristor control unit 11, and the low-voltage three-phase AC output is cut off by the three-phase thyristor dual-wave rectifier 8 and is not output. And switch unit 5b
Are ON, the high-voltage alternating current output and the low-voltage DC output output to the vehicle battery 9 and the vehicle electrical component 10 are shut off, and the exciting current based on the output voltage of the vehicle battery 9 A low-voltage three-phase AC output is applied to the field coil 1i, and a low-voltage DC current rectified by the double-wave rectifier 4 is supplied to the welding device 5. For this reason, the total output power of the generator 1
And the welding apparatus 5 can perform stable arc welding. The time required for one welding operation is only a few seconds, and the vehicle battery 9 is in a charged state at other times, so that the welding operation does not cause the vehicle battery 9 to rise. .

In this embodiment, a vehicle idle-up control unit 13 is provided in addition to the above-described configuration. The technical concept of the vehicle idle-up control unit 13 is the same as that disclosed, for example, in Japanese Patent Publication No. 5-74297, which has already been proposed by the applicant of the present invention. In the present embodiment, as a condition for the idle-up, the welding device 5
When the switch unit 5b is turned ON, the vehicle idle-up control unit 13 detects the input of the "H" level and outputs an idle-up control signal as described above. Is controlled, the rotational speed of the traveling engine increases, and the output of the generator 1 increases accordingly. As a result, the electric power supplied to the welding device 5 also increases, and more stable arc welding can be performed.

In the on-vehicle power generator with a welding function according to the present embodiment having the above-described configuration, a DC power source of the welding device 5 and a commercial AC 100 V equivalent to the output of one generator 1 driven by the traveling engine are used. By obtaining a high-voltage alternating current having an effective value and a low-voltage DC output for driving the vehicle, all of the devices can be arranged in the engine space of the vehicle.

Further, in the on-vehicle power generator with a welding function of the present embodiment, during welding, other outputs are cut off and the output of the generator 1 is increased by increasing the rotation speed of the traveling engine. It is not necessary to use a large-sized high-power generator, the circuit configuration is simple, the number of parts used is small, and it is possible to manufacture with only commercially available parts. Therefore, it is possible to easily procure parts and to reduce the manufacturing cost. In addition, since the circuits can be distributed and arranged for each component as needed, all the circuits can be accommodated in the engine space of a small automobile. Furthermore, since a sufficient output voltage can be maintained even with a large load, and the energy loss can be reduced, a highly efficient vehicle-mounted power generator can be provided at a low price.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be implemented in any manner as long as the configuration described in the claims is not changed. For example, in the present embodiment, the generator and the rectifier are three-phase, and the high-voltage alternating output current is single-phase. Further, by continuously varying the control signal applied to the switching element, a commercial single-phase AC 100 V
It is also possible to use the same sine wave AC output as the power supply of the above, and it can be arbitrarily implemented as needed. However, in this case,
Since the heat generated by the switching element increases, it is a matter of course that a separate heat radiation measure must be taken. Further, in the present invention, it is a matter of course that the rectifier 4 may be a three-phase thyristor rectifier and a voltage is supplied to the welding device 5 only when the switch 5b of the welding device 5 is ON.

[0022]

According to the on-vehicle power generating apparatus with a welding function of the present invention, a DC power source for a welding apparatus, a stabilized high-voltage alternating current equivalent to a commercial AC of 100 V, and a vehicle operating apparatus are provided. With the configuration for obtaining a low DC voltage, the DC low voltage can be disposed in the engine space of the vehicle as needed. In addition, during welding, the other outputs are cut off, so at the time of welding, the generator only needs to supply the power necessary for welding. In addition to supplying a voltage suitable for charging to the vehicle battery, the high-voltage alternating current output can be used as a power source such as a grinder, so that the vehicle battery is not damaged by overcharging or the like, and There is no need to secure a new power source for finishing work after welding.

Further, the on-vehicle power generator with a welding function of the present invention has a simple circuit configuration, requires a small number of parts, and can be manufactured with commercially available parts. High efficiency welding function because it can be mounted on small vehicles easily because it can be kept low and the circuit can be dispersed for each component as needed, and energy loss can be reduced. It has excellent effects, such as being able to provide the on-vehicle power generating device with a low price.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a generator according to an embodiment of the present invention.

FIG. 2 is a schematic circuit diagram of an on-vehicle power generation device according to an embodiment of the present invention.

FIG. 3 is a timing chart showing a method for controlling a switching element of the inverter circuit according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Generator 1 'Stator coil part 1a First stator coil 1b First stator coil tap 1c, 1d, 1e Three-phase high-voltage AC output terminal 1f, 1g, 1h Three-phase low-voltage AC output terminal 1i Field coil Reference Signs List 2 DC high voltage source 2a, 4 three-phase double-wave rectifier 2b constant voltage stabilization circuit 3 inverter circuit 5 welding device 5b switch unit 6 key switch 7 relay 8 three-phase thyristor double-wave rectifier 9 vehicle battery 11 thyristor control unit 12 current control Circuit 13 Vehicle idle-up control unit 14 Idle-up device T1, T2 output terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 9/073 515

Claims (3)

(57) [Claims] A first stator coil for generating a high-voltage alternating current, a second stator coil for generating a low-voltage alternating current, and the first and second stator coils. A generator having a field coil for generating a magnetic field acting on the stator coil; a first rectifier for rectifying the output current of the first stator coil; and a second rectifier for rectifying the output current of the second stator coil. And a third rectifier, wherein the output of the first rectifier is stabilized by a DC voltage stabilizing circuit, and is converted into a stabilized high-voltage alternating current equivalent to a commercial AC power supply via an inverter circuit; and An on-vehicle power generator with a welding function that uses the output of the second rectifier as a DC power source for welding and supplies the output of the third rectifier to a vehicle battery for traveling, and controls an exciting current of the field coil. When using the welding DC power supply, a current control means is provided and an external output control means for interrupting the output of the high-voltage alternating current and a charge control means for interrupting the application of the charging current to the vehicle battery are provided. Cuts off the output of the high-voltage alternating current and the charging current to reduce the load on the generator, and when the welding DC power supply is not used, the applied voltage of the vehicle battery is With a welding function, the charging current is supplied to the vehicle battery while controlling the exciting current of the field coil so that the voltage becomes the optimum voltage for charging the battery, and the output cutoff of the high-voltage alternating current is released. In-vehicle power generator. 2. A vehicle idling-up control means, wherein when the DC power source for welding is used, the output of the generator is increased by increasing the rotational speed of a traveling engine for the vehicle. Item 4. An on-vehicle power generator with a welding function according to item 1. 3. When the direct current power supply for welding is used, the high power is set based on the operation of a welding switch which is integrated with the welding device and is electrically connected in series with a running engine start switch of the vehicle. 3. The vehicle generator with a welding function according to claim 1, wherein at least one of the output of the voltage alternating current and the charging current is cut off.