JP2002291188A - Multiple output power supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple output power supply unit wherein a plurality of power outputs are obtained from a single power supply and the scale of circuit therefor can be reduced. SOLUTION: Wires are wound on the core of an alternating-current motor 21 which is driven by an inverter portion 20 for generating three-phase alternating current so that a transformer are constituted of a wire and one winding of the motor, and power is taken out of the transformer and used to drive other loads, for example, to charge a storage battery 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power supply device for obtaining a plurality of outputs from one power supply.

[0002]

2. Description of the Related Art Today, the development of environmentally friendly technologies has been called for. In particular, there are concerns about the effects of exhaust gas from automobiles with many users on the global environment. Under these circumstances, the development of automobiles driven by electric motors has been thriving in place of conventional gasoline-fueled engines and diesel engine-type automobiles. Hybrid cars that can both run by are actually being sold.

[0003] In a conventional engine-type vehicle, a power source for lighting in the vehicle, a compressor for an air conditioner, and the like have been supplied with electric power by a battery that charges using energy generated by driving the engine. However, when shifting from an engine-type vehicle to an electric vehicle, it is necessary to receive energy from a power supply provided in the electric vehicle for a power supply for lighting in the vehicle and a motor for a compressor for an air conditioner.

FIG. 4 is a diagram showing a configuration of a conventional power supply device. The main power supply 10 has a sufficiently large output,
It is configured to be able to supply all the power required for an electric vehicle. For example, an inverter 11 is connected to the main power supply 10 to convert DC to AC,
By driving an AC motor 13 for a compressor of an air conditioner or connecting a DC / DC converter 12,
Is charged.

As described above, in the conventional multi-output power supply device, each device is connected in parallel to the main power supply 10,
Circuits such as the inverter 11 and the DC / DC converter 12 are usually provided for each device that receives power supply from the main power supply 10. It should be noted that in FIG.
Motor 13 and storage battery 1 as devices for receiving power from
Although only 4 is shown, all other devices that require electric power and are mounted on the electric vehicle are connected to the main power supply 10 in parallel.

[0006]

As described above, with the shift from an engine-type vehicle to an electric vehicle, in an electric vehicle, it is necessary to supply power from a single power source to various motors and lighting devices. However, if wiring is performed independently from a single power supply to each motor, lighting device, and the like, the circuit scale increases, and the weight of the electric vehicle increases. This creates a need for a higher output of the drive motor, which requires a larger power supply. In addition, if the power supply becomes larger, the weight of the vehicle becomes larger, so that a drive motor with a larger output is required,
Therefore, a larger power supply is required.

As described above, it is not preferable that the circuit mounted on the electric vehicle is large in order to realize the electric vehicle, and it is desired to reduce the circuit configuration as much as possible. An object of the present invention is to provide a multi-output power supply device capable of obtaining a plurality of power supply outputs from a single power supply and reducing the circuit configuration therefor.

[0008]

SUMMARY OF THE INVENTION A multi-output power supply according to the present invention is a multi-output power supply that obtains multiple outputs from a single power supply, and is wound around an AC motor as a load and an iron core of the AC motor. An output line means wound around the iron core so as to form a wiring and a transformer, and by connecting a load to the output line means, the AC motor is driven by a single power supply and the load is driven. It is characterized by doing.

According to the present invention, a transformer for extracting electric power is formed in the AC motor means using the configuration of the AC motor means while driving the AC motor means as a load of a single power supply. , Power is taken out from the transformer to drive a subsequent load. Thus, since the transformer for extracting electric power uses the configuration of the AC motor means, the circuit configuration for driving a plurality of loads can be simplified.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention, a main power supply is connected to an AC motor such as a motor of a compressor for an air conditioner, and electric power to another device is taken out via the AC motor. .

FIG. 1 is a diagram showing a circuit configuration of an embodiment of the present invention. An inverter unit 20 for driving a compressor AC motor 21 is connected to a main power supply 10 which is a DC power supply. The inverter unit 20 has a configuration in which six transistors Tr1 to Tr6 are arranged two by two in series and arranged in parallel. These transistors Tr1 to Tr6 open and close as switches when receiving a command current from a control circuit described later, and convert DC current from main power supply 10 into AC current. Transistor Tr1,
The phases of the alternating currents generated by Tr2 and the transistors Tr3 and Tr4 and the transistors Tr5 and Tr6 are shifted from each other by 120 °, and the three currents are combined to generate a three-phase alternating current.

The three-phase alternating current generated in this manner is input to each port of the compressor AC motor 21. For example, in the case of the configuration of FIG.
The AC generated by r1 and Tr2 is an AC motor 2
The AC generated by the transistors Tr3 and Tr4 is input to the port 2 of the AC motor 21, and the AC generated by the transistors Tr5 and Tr6 is input to the port 3 of the AC motor 21.

Each AC thus input is supplied to a wire wound around the iron core of the AC motor 21.
The wires wound around this iron core are
3 is described as the reactance connected to the input line. Then, each AC is joined at one point. This junction is called the neutral point 25 of the AC motor. At the neutral point 25, the alternating currents merge at a phase difference of 120 ° from each other, so that the alternating current components cancel each other out and have a constant potential. In the actual AC motor 21, the neutral point 2
The potential of No. 5 is not a completely constant potential, and the potential fluctuates due to a high-frequency component caused by the operation of the AC motor 21, the switching operation of the transistors Tr1 to Tr6, and the like.

In the embodiment of the present invention, another wire is wound around a part of the wire wound around the iron core of the AC motor 21 to extract electric power. For example, in FIG. 1, another wire is newly wound around a portion where the wire connected to the port 1 is wound around the iron core (as a transformer is formed), and this other wire (output line) is connected to an AC motor. 2
Take out from 1 and the alternating current that occurs in the other wiring, for example,
Input to converter 22. The output of the converter 22 is used, for example, for charging the storage battery 23 and the like. Alternatively, the AC obtained from the other wiring may be converted into a predetermined frequency to drive another AC motor.

As described above, by winding another wire around the same portion as the iron core around which the wire connected to the port 1 is wound, the transformer having the core of the AC motor 21 as a core is connected to the port 1 and the other wire. And between them. Further, in the embodiment of the present invention, it is noted that once the AC motor 21 starts rotating, the AC motor 21 continues to rotate even if one phase of the three-phase AC applied to the AC motor 21 is shut out.

That is, for all wirings of ports 1 to 3,
When an AC for driving the AC motor 21 is applied and power is taken out only from the wiring of the port 1, the transistors Tr1 and Tr2 that supply the AC supplied from the port 1 drive the AC motor 21 and output power to the outside. Is supplied, a larger load is applied than the other transistors Tr3 to Tr6.

Therefore, when the AC motor 21 is in a normal operation, the AC motor 21 is driven by, for example, the supply of AC from the ports 2 and 3. Then, an AC having a frequency different from the frequency for driving the AC motor 21 is supplied from the port 1. Since the AC motor 21 acts on the frequency of the applied AC like a low-pass filter,
When an AC having a frequency higher than the frequency of the AC driving the AC motor 21 is applied, the operation of the AC motor 21 is not affected at all. That is, the high frequency alternating current does not provide any energy to drive the motor.

Therefore, the frequency of the alternating current generated from the transistors Tr1 and Tr2 is changed by the transistors Tr3 to Tr3.
When applied with a frequency different from the frequency of the AC generated in step 6,
The transformer using the motor core formed in the wiring of the port 1 supplies power directly from the alternating current generated by the transistors Tr1 and Tr2 to the load (the converter 22 and the storage battery 23 in FIG. 1). Only the action will be performed.

Therefore, according to the embodiment of the present invention,
While driving the compressor AC motor 21 with the main power supply 10 and the inverter unit 20, electric power is extracted from the AC motor 21 and another load (in FIG.
And the storage battery 23), and a multi-output power device with a small circuit configuration can be provided.

The other loads may include a converter and a DC motor, a combination of a converter, an inverter and an AC motor, and other lighting devices. FIG.
FIG. 2 is a diagram illustrating a schematic configuration of a drive circuit of the inverter unit in FIG. 1. The configuration of FIG. 2 is a diagram schematically illustrating the drive circuit 20 of the inverter unit of FIG. 1 known as PWM. The sine wave input input from the left side of FIG. It is directly input to the comparator 30-1. The comparator 30-1 has a triangular wave input, and generates a command current for the transistor by comparing the triangular wave input with the sine wave input. Comparator 30-
1 is divided into two branches, one of which is a transistor Tr1.
And the other is inverted by the inverter 32-1 and used as a command current for the transistor Tr2.

The sine wave input is input to a phase shifter 31-1 for rotating the phase by 120 °. The sine wave input whose phase is rotated by 120 ° is also input to the comparator 30-2 together with the triangular wave input, and the output of the comparator 30-2 is the command current of the transistor Tr3 and the transistor Tr3.
The command current of the transistor Tr4 is obtained by inverting the polarity of the command current of No. 3 by the inverter 32-2.

Further, the phase of the sine wave input is rotated by -120 ° by the phase shifter 31-2.
3 is input together with the triangular wave input to generate a command current for the transistor Tr5. The command current of the transistor Tr6 is obtained by inverting the polarity of the command current of the transistor Tr5 by the inverter 32-3.

As described above, the phases of the sine wave inputs are set to 1
By generating command currents for the transistors Tr1 to Tr6 using three sine waves that differ by 20 °, it is possible to cause the inverter unit to generate a three-phase alternating current from a direct current. FIG. 3 is a diagram showing another embodiment of the present invention.

In FIG. 3, the same components as those in FIG. 1 are simplified in illustration, and only different portions will be described. In the present embodiment, a power output coil is wound around the same iron core as the wiring of the port 1, and power is taken out in the same manner as in the embodiment of FIG.

By the way, the wiring of the port 1 is not limited to the alternating current generated by the transistors Tr1 and Tr2 but also has various frequencies due to the rotation of the iron core of the AC motor 21 and the fluctuation of the potential of the neutral point 25. Flows. Therefore, if the coil 40 is simply provided, alternating currents of various frequencies including these harmonics will be extracted from the coil 40.

However, when a storage battery or other load is connected to the end of the coil 40, it is desirable that the alternating current taken out from the coil 40 serving as a power supply for driving such a load has a predetermined frequency. . That is,
For example, considering the case where the converter 22 is attached as shown in FIG. 3, the converter 22 must be configured to cope with various harmonics, and the circuit scale becomes large, and it is difficult to manufacture the circuit. turn into.

Therefore, in the present embodiment, a resonance mechanism that resonates at a predetermined frequency is provided in order to extract an AC of a specific frequency from ACs of various frequencies induced in the coil 40. That is, in FIG. 3, a resonator including the coil 40 and the capacitor 41 is provided. Thereby, only the alternating current of the frequency resonating with the resonator is taken out,
An alternating current of that frequency can be applied to converter 22. In addition, in the resonator of FIG.
The configuration has both a function as a secondary coil of the transformer and a function as a part of the resonator. This allows
Rather than providing a separate reactance to form a resonator, the number of circuit elements can be reduced by one reactance.

In particular, it is preferable that the resonance frequency of the resonator formed by the coil 40 and the capacitor 41 matches the frequency of the alternating current generated by the transistors Tr1 and Tr2. Thus, the AC power generated by the transistors Tr1 and Tr2 can be efficiently extracted.

Here, as described in FIG. 1, the frequency of the alternating current generated by the transistors Tr1 and Tr2 is
The frequency is different from the frequency of the other two-phase alternating current, and is preferably higher than the frequency of the other two-phase alternating current.
As a result, the AC power generated by the transistors Tr1 and Tr2 is not consumed to drive the AC motor 21 but directly passes through the coil 40 to the load (in the case of FIG. 3, the capacitor 41, the converter 22, and the storage battery). 23).

In the above embodiment, the single main power supply drives the AC motor for the compressor and the load connected to the AC motor, but the load is the same as in the present embodiment. Note that an AC motor may be used as a load, and the load according to the present embodiment may be connected further ahead of the AC motor. By doing so, a plurality of loads can be sequentially connected within a range where the main power supply can supply power.

[0031]

According to the present invention, it is possible to provide a multi-output power supply device capable of obtaining a plurality of power supply outputs from a single power supply and reducing the circuit configuration therefor.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating a schematic configuration of a drive circuit of an inverter unit in FIG. 1;

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional power supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main power supply 20 Inverter part 21 (For compressor) AC motor 22 Converter 23 Storage battery 25 Neutral point 30-1 to 30-3 Comparator 31-1, 31-2 Phase shifter 32-1 to 32-3 Inverter

Claims (6)

[Claims] 1. A multi-output power supply device for obtaining multiple outputs from a single power supply, comprising: an AC motor means as a load; a wire wound around an iron core of the AC motor means; and a transformer wound around the iron core to form a transformer. And a load connected to the output line means to drive the AC motor by a single power supply and to drive the load. 2. A multi-output device according to claim 1, wherein a resonator means is provided in said output line means, and only AC having a desired frequency is taken out of a plurality of frequency components taken out from said output line. Power supply. 3. The resonator according to claim 2, wherein said resonator means comprises a winding portion of said output wire means wound around said iron core, and a capacitor provided on said output wire means.
A multi-output power supply device according to claim 1. 4. The multiple output power supply device according to claim 1, wherein said loads are a converter and a storage battery. 5. The multiple output power supply device according to claim 1, wherein said loads are a converter and a DC motor. 6. The multi-output power supply according to claim 1, wherein the load is a combination of a converter, an inverter, and an AC motor.