JP2932053B2 - 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 an engine mounted on a vehicle as a driving source, and more particularly to a DC low voltage current required for vehicle operation using two generators and a three-phase AC 200 V. The present invention relates to an in-vehicle power generation device capable of stably supplying a high-voltage alternating current equivalent to a commercial power supply such as the above.

[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 DC voltage drop caused by the voltage control transistor used in the constant voltage stabilizing circuit causes a decrease in the DC voltage compared to the conventional method using no DC stabilized power supply. The output voltage of the generator must be increased, the load on the engine mounted on the vehicle that is the driving source of the generator increases, and the transistor must have a high withstand voltage and allow a large current to flow.
In addition, since heat is generated due to internal loss, a protection circuit for preventing thermal runaway is actually required, and the number of components increases, resulting in a 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.

On the other hand, in the latter method, the circuit for performing the synchronization control becomes complicated, the number of parts increases, the price increases, the reliability decreases, and the whole system becomes large. There is a problem that it cannot be mounted on ordinary vehicles.

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

[0007]

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,
A vehicle-mounted power generator for supplying an exciting current to the field coils of the first and second generators as an output power supply of the rectifier of the first generator, wherein the second generator rectifies the output current of the first stator coil of the first generator. And a third rectifier for rectifying the output current of the first stator coil of the second generator,
The output of the second rectifier and the output of the third rectifier are electrically connected in series to form a DC high voltage source, and the output of the DC high voltage source is converted into an alternating current equivalent to that of a commercial AC power supply using an inverter circuit. And a first current control means for controlling the exciting current of the field coil of the first generator, and the first current control means for controlling the exciting current of the field coil of the first generator based on the output voltage of the DC high voltage source. An object of the present invention is to provide an on-vehicle power generator for controlling an exciting current.

Further, according to the present invention, a second current control means for controlling an exciting current of a field coil of the second generator is provided, and the second generator is controlled based on an output voltage of the first rectifier. 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 the exciting current of the field coil of the second generator so that the output voltage of the first rectifier becomes the optimum voltage for charging the storage battery. Things.

[0010]

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 in a Y-shape, and forming 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 negative output of the rectifier 2a and the positive output of the rectifier 2b are electrically connected, and the smoothing capacitor 2c is connected in parallel to the positive output of the rectifier 2a and the negative output of the rectifier 2b to obtain a direct current. The high voltage source 2 is configured.

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 three-phase AC 200
In order to secure 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 is used to excite the field coil 1i of the generator A. By controlling the current, the three-phase high-voltage AC output of the generator A is changed so that the output voltage value of the DC high-voltage source 2 becomes 200 to 240 V DC. In the current control circuit 7, the circuit is simplified by electrically insulating the voltage detection unit 7a and the current control unit 7b using a photocoupler. Also, in the current control circuit 7, when the voltage between the output terminals 1g and 1h of the generator B is reduced to, for example, about 9V DC which is an obstacle to the running of the vehicle, the field coil 1i of the generator A is excited. A function of blocking the flow of current is provided to prevent the vehicle battery 4 from rising.

In this embodiment, the output of the DC high voltage source 2 is supplied to the commercial three-phase AC 200 V
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 a switching section 3a including six switching elements Q1 to Q6 (transistors in the figure) and an inverter control section 3b for controlling the switching section 3a.
6 is sequentially switched based on a control signal output from the inverter control unit 3b, thereby converting the output of the DC high voltage source 2 into a rectangular wave three-phase alternating current. Note that a protection circuit may be connected to each of the switching elements Q1 to Q6 in parallel. Also, the switching element is a power MO
By using the SFET, the ON resistance of the element can be reduced, the conversion efficiency can be increased, and the heat generation can be suppressed to further reduce the size of the device.

In the on-vehicle power generator according to the present embodiment having the above-described structure, the generators A and B are connected to the three-phase AC100.
General purpose 2 with V output and low voltage DC output for vehicle running
By using a single small generator, it can be installed in the engine space of the vehicle while maintaining the balance of weight, the circuit configuration is simple, the number of parts used is small, and commercially available parts It is easy to procure parts and keep manufacturing costs low.Also, circuits can be distributed for each component as needed, making it possible to manufacture small vehicles. Everything can be stored in the engine space. Further, a sufficient output voltage can be maintained even under a large load, and the energy loss can be reduced, so that 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, the rectifier, and the high-voltage alternating output current have three phases, but the same effect can be obtained even with a single phase. Further, by continuously varying the control signal applied to the switching element, it is possible to obtain the same sine wave AC output as a commercial three-phase AC 200 V power supply, and this can be arbitrarily implemented as necessary. 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.

[0019]

According to the on-vehicle power generator of 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 structure is simple, the number of parts used is small, and it can be manufactured with commercially available parts, so that parts can be easily procured and the manufacturing cost can be kept low. , And can be easily mounted on a small vehicle. In addition, it is possible to maintain a sufficient output voltage even under a large load, and furthermore, it is possible to provide a highly efficient in-vehicle power generating device at a low price because energy loss can be reduced. .

[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.

[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 Current control circuit 6a, 7a Voltage detector 6b, 7b Current controller

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, comprising: a second rectifier for rectifying an output current of a first stator coil of a first generator; and a third rectifier for rectifying an output current of a first stator coil of the second generator. And the second
The output of the rectifier and the output of the third rectifier are electrically connected in series to form a DC high voltage source, and the output of the DC high voltage source is converted into an alternating current equivalent to that of a commercial AC power supply using an inverter circuit. And a first current control means for controlling an exciting current of a field coil of the first generator, wherein an exciting current of the field coil of the first generator is controlled based on an output voltage of the DC high voltage source. An on-vehicle power generator characterized by controlling the following. And a second 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.