JPH0984396A - Onboard power generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a device and to stabilize the output voltage in an onboard power generating device in which the engine of a vehicle is the drive source. SOLUTION: The AC 100V output of compact power generators A, B is rectified by rectifiers 2a, 2b, the rectified output is electrically connected in series to make a DC high voltage source 2, the output is converted into the alternating current whose effective value is equivalent to that of the commercial power supply system by an inverter circuit 3 and outputted, and the output voltage of the inverter circuit 3 is stabilized by controlling the excitation current to be fed to a field coil 1i of the generator A, based on the voltage of the DC high voltage source 2.

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 drive source, and in particular, using two generators, a DC low voltage current required for vehicle operation and a three-phase AC200V. The present invention relates to a vehicle-mounted power generator capable of stably supplying a high-voltage alternating current equivalent to a commercial power source such as

[0002]

2. Description of the Related Art Conventionally, as an on-vehicle power generator capable of obtaining a high output voltage equivalent to that of a stable commercial power source, there has been one proposed by the applicant of the present invention, for example, in Japanese Patent Laid-Open No. 1-259798. Further, as an on-vehicle power generation device having a plurality of power generation mechanisms, there is a power generation device disclosed in Japanese Patent Application Laid-Open No. 2-123131 which was also proposed by the present applicant. Among them, the former stabilizes the output voltage of the inverter circuit by rectifying the high-voltage three-phase alternating current output from the generator into direct current and stabilizing the voltage through a constant voltage stabilizing circuit. It will be transformed.

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

[0004]

However, in the former method, the direct current voltage is lowered due to the voltage controlling transistor used in the constant voltage stabilizing circuit, so that the conventional method which does not use the stabilized DC power source is used. The output voltage of the generator must be increased, the load of the engine mounted on the vehicle that is the drive source of the generator is increased, and the transistor must be high withstand voltage and capable of flowing a large current,
Moreover, since heat is generated due to internal loss, a protection circuit for preventing thermal runaway is actually required, and the number of parts increases, resulting in a high price. In addition, a large radiator is required to dissipate heat to the outside, which increases the size of the entire device, which is not suitable for vehicle installation.

On the other hand, in the latter method, the circuit for performing the synchronization control becomes complicated, the number of parts increases, the cost becomes high, the reliability decreases, and the whole system becomes large, so that the size is small. There was a problem that it could not be installed in ordinary vehicles.

In either method, DC14 to 14.5V, which is stable with respect to the on-vehicle battery, is used.
It was not always possible to supply the voltage of and to keep the battery in a charged state at all times.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and uses a traveling engine for a vehicle as a drive source to generate a high-voltage alternating current and a first stator coil 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 alternating current; and a second stator coil for generating a low-voltage alternating current. A second generator having a field coil that generates a magnetic field that acts on the first and second stator coils; and a first rectifier that rectifies the output current of the second stator coil of the second generator. With the first
The output of the rectifier is connected to the storage battery in parallel, and
Is a vehicle-mounted power generator that supplies an exciting current to the field coils of the first and second generators as an output power source of the rectifier, and the output current of the first stator coil of the first generator is rectified. 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 an alternating current equivalent to that of a commercial AC power source using an inverter circuit. And a first current control means for controlling the exciting current of the field coil of the first generator and converting the field coil of the first generator based on the output voltage of the DC high voltage source. An in-vehicle power generator that controls an exciting current is provided.

The present invention further comprises second current control means for controlling the exciting current of the field coil of the second generator, and the field of the second generator is controlled based on the output voltage of the first rectifier. An on-vehicle power generator that controls an exciting current of a magnetic coil is provided.

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

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a circuit configuration of two generators A and B used in an 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 structure, and are arranged immediately behind the running engine (not shown) for a vehicle as a drive source. There is.

In the generator 1, one end of a first stator coil 1a for generating an alternating current of AC100V is connected in a Y shape to form a stator coil portion 1'for three-phase output, and each winding of the stator coil 1a is formed. The tap 1b is taken in the middle of the step 1 and 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 the connection terminals 1c, 1d, 1e provided on the generator 1 to form a three-phase AC current output terminal of AC100V. Further, the output current of each tap 1b is double-wave rectified by the three-phase rectifier 1f, which is the first rectifier, and its output is connected to the connection terminals 1g and 1h to connect to the DC low voltage of the vehicle battery or vehicle electrical components described later. Use as an output terminal.

On the other hand, a field coil 1i for generating a magnetic field acting on the stator coil portion 1'is provided, and the field coil 1i is provided.
One end of i is grounded to the casing of the generator 1, and the other end is connected to the connection terminal 1j. Then, the ground terminal 1k electrically connected to the casing of the generator 1 is provided. In this embodiment, since the DC power source of the generator A is not used, both connection terminals 1g and 1h are open.

FIG. 2 shows a schematic circuit diagram of a vehicle-mounted power generator according to an embodiment of the present invention. In the figure, 2a and 2b
Is a high-voltage three-phase double-wave rectifier, which rectifies the output currents of the three-phase AC 100V of the generator A and the generator B, respectively. Then, the negative side output of the rectifier 2a and the positive side output of the rectifier 2b are electrically connected, and the smoothing capacitor 2c is connected in parallel to the positive side output of the rectifier 2a and the negative side output of the rectifier 2b. The high voltage source 2 is configured.

Further, the DC low voltage output terminal 1 of the generator B
A vehicle battery 4 and a 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 optimum voltage value for charging the vehicle battery 4.
A current control circuit 6 for controlling the exciting current of the output terminal 1g,
Connect in parallel to 1h. The current control circuit 6 includes a voltage detection unit 6
When the voltage between the output terminals 1g and 1h is reduced to, for example, about DC9V, which is an obstacle to traveling of the vehicle, the field coil 1i of the generator B is constituted by a transistor that is a and a current control unit 6b. Is provided with a function of blocking the flow of the exciting current to prevent the vehicle battery 4 from being depleted.

On the other hand, the output voltage of the DC high voltage source 2 is a three-phase AC200 which is the output of the vehicle-mounted power generator in this embodiment.
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 field coil 1i of the generator A is excited by the transistor that is the current control unit 7b. By controlling the current, the three-phase high voltage AC output of the generator A is changed so that the voltage value of the output of the DC high voltage source 2 becomes DC200 to 240V. 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 photo coupler. Further, 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 traveling of the vehicle, the field coil 1i of the generator A is excited. The function of blocking the flow of current is provided to prevent the vehicle battery 4 from running up.

In the present embodiment, the output of the DC high voltage source 2 is supplied to the commercial three-phase AC 200V by the inverter circuit 3.
It is converted into a rectangular wave alternating current with the same effective value as the power supply of. That is, the inverter circuit 3 includes a switching unit 3a including six switching elements Q1 to Q6 (transistors in the figure) and an inverter control unit 3b that controls the switching unit 3a.
By sequentially switching 6 based on the control signal output from the inverter control unit 3b, the output of the DC high voltage source 2 is converted into a rectangular wave three-phase alternating current. A protection circuit may be connected in parallel to each of the switching elements Q1 to Q6. In addition, the switching element power MO
By using the SFET, it is possible to reduce the ON resistance of the element to improve the conversion efficiency, suppress the heat generation, and further reduce the size of the device.

In the in-vehicle power generator of the present embodiment having the above-described structure, the generators A and B are three-phase AC100.
General-purpose 2 with V output and low voltage DC output for vehicle running
Since it is a small-sized generator, it can be placed in the engine space of the vehicle while maintaining the balance of weight, and the circuit configuration is simple and the number of parts used is small, and it is a commercially available part. Since it can be manufactured only by itself, it is easy to procure parts, the manufacturing cost can be kept low, and the circuit can be distributed for each constituent element as needed, so that it can be used for small automobiles. Everything can be stored in the engine space. Furthermore, it is possible to maintain a sufficient output voltage even under a large load and to reduce energy loss, so that it is possible to provide a highly efficient on-vehicle power generator at a low price.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments and can be carried out in any manner as long as the configuration described in the claims is not changed. 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 an AC output of the same sine wave as that of the commercial three-phase AC200V power source, and it can be arbitrarily implemented as needed. However, in this case, since the switching element generates a large amount of heat, it is needless to say that a separate heat radiation measure must be taken.

[0019]

In the vehicle-mounted power generator of the present invention, the generator is two general-purpose small-sized generators, so that the generator can be disposed in the engine space of the vehicle while maintaining the weight balance. The configuration is simple and the number of parts used is small, and because it can be manufactured with commercially available parts, it is easy to procure parts and the manufacturing cost can be kept low. Since it can be dispersed in a small vehicle, it can be easily mounted in a small vehicle. In addition, it is possible to maintain a sufficient output voltage even under a large load, and since energy loss can be reduced, it is possible to provide a highly efficient on-vehicle power generator at a low price, which is an excellent effect. .

[Brief description of 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 in-vehicle power generator 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 AC current output terminal 1f, 2a, 2b Three-phase double-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 detection unit 6b, 7b Current control unit

Claims (3)

[Claims] 1. A first stator coil for generating a high-voltage alternating current using a running engine for a vehicle as a drive source, and the first stator coil.
A first 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 that generates a magnetic field that acts on the first and second stator coils; and a first generator that rectifies the output current of the second stator coil of the second generator. And a rectifier, the output of the first rectifier is connected to a storage battery, and the output of the first rectifier is used as a power source to supply exciting currents to the field coils of the first and second generators, respectively. A second rectifier for rectifying 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 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 source by using an inverter circuit. In addition, a first current control means for controlling the exciting current of the field coil of the first generator is provided, and the exciting current of the field coil of the first generator is based on the output voltage of the DC high voltage source. An in-vehicle power generator, which controls 2. A second current control means for controlling the exciting current of the field coil of the second generator is provided, and the field coil of the second generator is excited based on the output voltage of the first rectifier. The vehicle-mounted power generator according to claim 1, wherein the current is controlled. 3. The exciting current of the field coil of the second generator is controlled so that the output voltage of the first rectifier becomes an optimum voltage for charging the storage battery. Item 3. The vehicle power generator according to any one of Items 2.