JP2932054B2 - Onboard generator - 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 traveling engine mounted on a vehicle as a driving source. The present invention relates to an on-vehicle power generator capable of stably supplying a high-voltage alternating current equivalent to a commercial power supply such as AC100V.

[0002]

2. Description of the Related Art Conventionally, as an on-vehicle power generator capable of obtaining a high output voltage equivalent to a stable commercial power supply, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 1-259798, which has already been proposed by the applicant of the present invention. As an in-vehicle power generation device having a plurality of power generation mechanisms, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 2-13231, which has been already proposed by the present applicant. Among them, the former stabilizes the output voltage of the inverter circuit by rectifying the high-voltage three-phase AC current output from the generator to DC and stabilizing the voltage through a constant voltage stabilization circuit. It becomes something.

In the latter, an external frequency control section is provided in the inverter section, and a plurality of power generation mechanisms are synchronously controlled based on a synchronization signal from the outside, and outputs are electrically connected in parallel, so that large commercial power can be obtained. What you get.

[0004]

However, in the former method, the current control transistor of the constant voltage stabilizing circuit must have a high withstand voltage and allow a large current to flow, and heat is generated due to internal loss. Actually, a protection circuit for preventing thermal runaway is required, and the number of parts increases, resulting in high price. In addition, a large-sized radiator is required to release heat to the outside, and the overall size of the device becomes large, which is not suitable for mounting on a vehicle.

In the latter method, the circuit for performing the synchronization control is complicated, the number of parts is increased, the cost is high, the reliability is reduced, and the whole system is large. There has been a problem that it cannot be mounted on ordinary vehicles.

[0006] In either method, it is not always possible to supply a stable voltage of, for example, 14 to 14.5 V DC to a vehicle-mounted battery and keep the battery in a charged state at all times.

On the other hand, a method of replacing the generator of the vehicle with a high-power generator and using it is also conceivable. However,
In this method, the shape of the generator becomes too large to fit in the engine room of a small passenger car or the like, and because of its considerable weight, the balance of the vehicle is deteriorated and the running performance is affected. In order to stabilize the output voltage, a method using the above-described constant voltage stabilizing circuit must be adopted, and measures against heat generation and an increase in the size of the apparatus cannot be solved.

[0008]

SUMMARY 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 driving engine for a vehicle as a drive source, and the first stator. A first generator having a field coil for generating a magnetic field acting on the coil, a first stator coil for generating a high-voltage AC current, and a second stator coil for generating a low-voltage AC current; A second generator having a field coil for generating a magnetic field acting on the first and second stator coils, a first rectifier for rectifying an output current of the second stator coil of the second generator; And the first
Of the rectifier is connected in parallel to the storage battery,
An on-vehicle power generator for supplying an exciting current to the field coils of the first and second generators using the output of the rectifier as a power source, and rectifying the output current of the first stator coil of the first generator. A second rectifier; and a third rectifier for rectifying an output current of the first stator coil of the second generator,
The output of the third rectifier is electrically connected in parallel to the output of the second rectifier via the first current control means to form a DC high voltage source, and the output of the DC high voltage source is used by an inverter circuit. To convert it into an alternating current equivalent to that of a commercial AC power supply,
A second current control means for controlling an exciting current of a field coil of the first generator; controlling the first current control means based on an output voltage of the DC high voltage source; It is an object of the present invention to provide an on-vehicle power generator in which an exciting current of a field coil of a first generator is controlled by means to stabilize an output voltage of an inverter circuit.

Further, according to the present invention, there is provided a third current control means for controlling an exciting current of a field coil of the second generator. An object of the present invention is to provide an on-vehicle power generator for controlling an exciting current of a magnetic coil.

Further, the present invention provides an on-vehicle power generator for controlling an exciting current of a field coil of a second generator so that an output voltage of the first rectifier becomes an optimum voltage for charging the storage battery. Things.

[0011]

FIG. 1 shows a circuit configuration of two generators A and B used in one embodiment of the present invention. The generators A and B used in this embodiment are general-purpose small-sized on-vehicle generators 1 having the same configuration, and are disposed immediately adjacent to a traveling engine (not shown) for a vehicle as a driving source. I have.

The generator 1 has a three-phase output stator coil portion 1 'formed by connecting one end of a first stator coil 1a for generating an AC current of 100V AC in a Y-shape, and 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 form a three-phase AC current output terminal of AC100V. The output current of each tap 1b is double-wave rectified by a three-phase rectifier 1f, which is a first rectifier, and its output is connected to connection terminals 1g and 1h to connect a DC low voltage of a vehicle battery or a vehicle electrical component to be described later. 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. In this embodiment, since the DC power supply of the generator A is not used, the connection terminals 1g and 1h are both open.

FIG. 2 is a schematic circuit diagram of a vehicle-mounted power generator according to one embodiment of the present invention. In the figure, 2a and 2b
Is a high withstand voltage three-phase dual-wave rectifier, which rectifies the output current of the three-phase AC 100 V of the generator A and the generator B, respectively. The output of the rectifier 2b is electrically connected in parallel to the output of the rectifier 2a via the current control circuit 2c, and the smoothing capacitor 2d is connected in parallel to form the DC high voltage source 2. At this time, in order to secure an alternating current having an effective value equivalent to that of a single-phase AC 100 V commercial power supply, which is the output of the on-vehicle power generating device in the present embodiment, the output voltage of the DC high voltage source 2 is used as a voltage detection unit 2c '
By controlling the current passing between the collector and the emitter of the transistor constituting the current control unit 2c ″ based on the voltage, the voltage value of the DC high voltage
It is controlled to be 120 to 140V. Incidentally, the transistor constituting the current control section 2c "has a smaller current capacity than the control transistor of the constant voltage stabilizing circuit in the conventional example, so that countermeasures such as heat generation become easy.

The DC low voltage output terminal 1 of the generator B
The vehicle battery 4 and the vehicle electrical component 5 are connected in parallel to g and 1h, and the output terminal 1h is grounded. Then, the field coil 1i of the generator B is set so that the voltage of the output terminal 1g becomes 14 to 14.5V (when a 12V battery is used), which is the optimal voltage value for charging the vehicle battery 4.
A current control circuit 6 for controlling the exciting current of the output terminal 1g,
1h in parallel. The current control circuit 6 includes a voltage detection unit 6
a and a transistor that is a current control unit 6b, and when the voltage between the output terminals 1g and 1h is reduced to, for example, about 9 V DC which is an obstacle to running of the vehicle or the like, the field coil 1i of the generator B Has a function of blocking the flow of the exciting current to prevent the vehicle battery 4 from running out.

On the other hand, the output voltage of the DC high-voltage source 2 is a single-phase AC 100
In order to secure an alternating current having an effective value equivalent to that of the commercial power supply of V, the output voltage of the DC high-voltage source 2 is detected by the voltage detection unit 7a of the current control circuit 7, and based on this, the transistor which is the current control unit 7b The excitation current of the field coil 1i of the generator A is controlled by changing the three-phase high-voltage AC output of the generator A, and the voltage value of the output of the DC high-voltage source 2 becomes, for example, 120 to 140 V DC. Control.

That is, in the DC high voltage source 2, the output currents on the high voltage side of the generators A and B are respectively rectified to DC and the output voltage value of the DC high voltage source 2 falls within a predetermined range. While controlling the output voltage on the high voltage side of the generator A (the field current of the generator A) and the rectified output current on the high voltage side of the generator B (= collector-emitter current of the transistor 2c ″), respectively. With such a configuration, the generators A and B can be easily operated in parallel without obtaining a complicated configuration such as synchronous control to obtain large power. The current control circuit 7 simplifies the circuit by electrically insulating the voltage detection unit 7a and the current control unit 7b by using a photocoupler. , Generator B When the voltage between the terminals 1g and 1h is reduced to, for example, about 9 V DC which is an obstacle to the running of the vehicle, the vehicle is provided with a function of blocking the excitation current from flowing through the field coil 1i of the generator A. This prevents the battery 4 from running out.

In this 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.

Then, as shown in FIG. 3, by sequentially switching the switching elements Q1 to Q4 based on a control signal output from the inverter control section 3b, the output of the DC high voltage source 2 is changed to a single-phase rectangular wave. Converted to 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. It works extremely effectively in preventing the effects of induced back electromotive force when connected to T1 and T2. By using a power MOSFET as the switching element, it is possible to reduce the ON resistance of the element, increase the conversion efficiency, suppress heat generation, and further reduce the size of the device. In this case, since the power MOSFET is structurally formed with a parasitic diode in the reverse direction in parallel, D1 to D4
May be excluded from the circuit.

In the on-vehicle power generator of the present embodiment configured as described above, the generators are the generators A and B and the three-phase AC 100
General purpose 2 with V output and low voltage DC output for vehicle running
By using a small generator, it is possible to dispose it in the engine space of the vehicle while maintaining the weight balance. Further, the electric power based on the generators A and B is electrically parallelized without taking a complicated configuration such as synchronous control of the generators A and B or synchronous control of the electric power based on the outputs of the generators A and B. And the output voltage is also stabilized, so that 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 without changing the configuration described in the claims. For example, in the present embodiment, the generator and the rectifier are three-phase, and the high-voltage alternating output current is single-phase. Also, by continuously varying the control signal applied to the switching element, it is possible to obtain the same sine wave AC output as the commercial single-phase AC 100 V power supply,
It can be implemented arbitrarily 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.

[0022]

In the vehicle-mounted power generator according to the present invention, since the generators are two general-purpose small generators, they can be arranged in the engine space of the vehicle while maintaining the weight balance. The electric power based on the two generators is electrically connected in parallel without taking a complicated configuration such as synchronous control of the two generators or synchronous control of the electric power based on the outputs of the two generators. Since the power supply and the output voltage are stabilized, the circuit configuration is simple, the number of parts used is small, the on-vehicle power generator with high output current can always be operated in a stable state, and the large load In this case, a sufficient output voltage can be maintained and the charging of the vehicle battery is taken into consideration, so that the vehicle battery can be prevented from being overcharged or rising.

Further, since the on-vehicle power generating device of the present invention can be manufactured with commercially available parts, it is easy to procure the parts and the manufacturing cost can be kept low, and the circuit can be distributed for each component as necessary. Since it can be easily mounted on a small vehicle and energy loss can be reduced, it is possible to provide a high-efficiency in-vehicle power generation device at 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 of controlling a switching element of an inverter circuit according to one embodiment of the present invention.

[Explanation of symbols]

 1, A, B Generator 1 'Stator coil part 1a First stator coil 1b First stator coil tap 1c, 1d, 1e Three-phase alternating current output terminal 1f, 2a, 2b Three-phase dual-wave rectifier 1g, 1h DC low voltage output terminal 1i Field coil 2 DC high voltage source 3 Inverter circuit 4 Vehicle battery 6, 7, 2c Current control circuit 6a, 7a, 2c 'Voltage detection unit 6b, 7b, 2c "Current control unit T1, T2 Output Terminal

Claims (3)

(57) [Claims] A first stator coil for generating a high-voltage alternating current by using a traveling engine for a vehicle as a drive source;
Generator having a field coil for generating a magnetic field acting on the stator coil, a first stator coil for generating a high-voltage alternating current, and a second stator coil for generating a low-voltage alternating current A second generator having a field coil for generating a magnetic field acting on the first and second stator coils; and a first generator for rectifying an output current of the second stator coil of the second generator. A rectifier, wherein the output of the first rectifier is connected to a storage battery, and the exciting current is supplied to the field coils of the first and second generators using the output of the first rectifier as a power source. An apparatus, wherein the first
A second rectifier for rectifying the output current of the first stator coil of the generator, and a third rectifier for rectifying the output current of the first stator coil of the second generator. The output of the third rectifier is electrically connected in parallel to the output of the third rectifier via the first current control means to provide a DC high voltage source, and the output of the DC high voltage source is connected to a commercial AC using an inverter circuit. A second current control means for converting the current into an alternating current equivalent to that of the power supply and controlling the exciting current of the field coil of the first generator is provided, and the first current is controlled based on the output voltage of the DC high voltage source. An on-vehicle power generator, wherein the control means is controlled and the second current control means controls the exciting current of the field coil of the first generator to stabilize the output voltage of the inverter circuit. And a third current control means for controlling an exciting current of a field coil of the second generator, and exciting the field coil of the second generator based on an output voltage of the first rectifier. The on-vehicle power generator according to claim 1, wherein the current is controlled. 3. An exciting current of a field coil of a second generator is controlled so that an output voltage of the first rectifier becomes an optimal voltage for charging the storage battery. Item 3. The vehicle power generator according to any one of Items 2.