JPH06276749A - Power converter - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a converter that allows easy connection between converter units and can easily respond to changes in specifications. [Structure] Input / output distribution circuits 11A and 11B to which detection signals of inverter current detectors 4A and 4B for measuring outputs of inverter circuits 3A and 3B are input are housed in an inverter board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a power converter having a plurality of converters.

[0002]

2. Description of the Related Art As is well known, for example, an inverter circuit forming a power conversion device for converting DC power into AC power may be connected in multiple stages or in parallel depending on the capacity of the AC power to be output. . In such a power converter, a control signal is given to each inverter circuit so that a desired output voltage and output frequency can be output.

On the other hand, a power converter and a control circuit for protecting a power source and a load connected to an input side and an output side of the power converter are composed of low level rated voltage components. An amplification / conversion circuit is provided to match the current / voltage detector of each inverter circuit with the control circuit.

FIG. 5 is a block diagram showing the configuration of an inverse converter which is an example of a conventional power converter. In FIG. 5, DC power is supplied from the DC power supply 1 to the inverter circuits 3A and 3B via the DC input breaker 2 and is inversely converted into AC power by the inverter circuits 3A and 3B. The inverter circuits 3A and 3B are connected in parallel with the inverter current detectors 4A and 4B connected in series, and the outputs of the inverter circuits 3A and 3B connected in parallel are output current detection as a power converter. It is supplied to the load 8 via the device 5 and the AC output circuit breaker 7.

An output voltage detector 6 is connected between the output current detector 5 and the AC output circuit breaker 7, and a voltage detection signal from the output voltage detector 6 and each current detector 4A,
The current detection signals from 4B and 5 are input to the amplification / conversion circuit 9 and converted into signal levels that match the input circuit of the control circuit 10. Further, the control signal output from the control circuit 10 for controlling each of the inverter circuits 3A and 3B is amplified by the amplification / conversion circuit 9 to be output to each of the inverter circuits 3A and 3B.
Sent to. As described above, the control circuit 10 is generally composed of an electronic circuit using an IC or the like, has a small rated voltage / current value, and is connected to the amplification / conversion circuit 9 by the multicore cables 23A and 23B. There is.

FIG. 6 is an example of a perspective view showing an actual arrangement of the block diagram of the inverter device shown in FIG.
In FIG. 6, the control circuit 10, the DC input circuit breaker 2, the AC output circuit breaker 7 and the amplification / conversion circuit 9 are respectively shown in the input / output board 31.
It is stored in. The inverter circuit 3A, the cooling fan 18A for cooling the heat generated from the elements of the inverter circuit 3A, the current detector 4A, the current detector 5 and the output voltage detector 6 are adjacent to the input / output board 31. Similarly, the inverter circuit 3B, the cooling fan 18B for cooling the heat generated from the elements of the inverter circuit 3B, and the output current detector 4B are installed in the inverter board 3B.
It is stored in.

The wiring of the main circuit from the DC power supply 1 shown in FIG. 5 is connected to the input / output board 31 shown in FIG.
Is branched and wired to the inverter circuits 3A and 3B via. Further, wiring lines for control signals and detection signals are wired to the inverter boards 32 and 33 from the amplification / conversion circuit 9 inside the input / output board 31. The combined output of the inverter circuits 3A and 3B is detected by the common output current detector 5, passes through the AC output breaker 7 inside the input / output board 31, and is supplied from the input / output board 31 to the load 8. In this way, the main circuit and the control / detection signals are wired between the input / output board 31 housing the control circuit 10 and the inverter boards 32, 33.

[0008]

However, in the power conversion device having such a structure, when the inverse conversion device is manufactured at the factory and then transported for installation at a predetermined place, it is divided into each panel. Since it is necessary, the wiring between the boards requires a connection part or a connector for relay. Since the connector is a signal before the control / detection signal is amplified and converted, it has a capacity in which the working voltage, the current carrying capacity, the withstand voltage and the like are sufficiently taken into consideration. Further, the electric wire to be wired has the same capacity as that described above. Therefore, it takes a long time to connect the wiring and the number of relay points increases, which may reduce the reliability of the connection portion.

Next, when the capacity of the inverse conversion device is increased in the future or when the capacity of the inverse conversion device is increased by changing the specifications of the user during the manufacturing process, the wiring from the input / output panel 31 and the addition of the relay connector are added. Is required, and further amplification /
The conversion circuit 9 must also be modified. However, since this takes a considerable amount of time, it cannot be implemented in a real product.

The present invention has been made in view of the above-mentioned problems, and facilitates the connection between the panels of the cubicles or units that form the power conversion device, and reduces the number of connection portions for division and reassembly. It is an object of the present invention to provide a power conversion device that can reduce the time required for the power conversion, can prevent a connection failure from occurring, and can easily cope with a change in specifications.

[0011]

According to a first aspect of the present invention, a plurality of inverter units, a control circuit for controlling the inverter units, and an amplifier for converting an output signal of the inverter unit and inputting the converted signal to the control circuit. In a power conversion device including a conversion circuit, an input / output distribution circuit that receives an output signal of the inverter unit and outputs the output signal to the control circuit is provided in each inverter unit.

Further, the invention according to claim 2 comprises a plurality of inverter units, a control circuit for controlling the inverter units, and an amplification / conversion circuit for converting an output signal of the inverter unit and inputting the converted signal to the control circuit. In the power conversion device, each inverter unit is provided with an input / output distribution circuit that receives an output signal of the inverter unit and outputs it to the control circuit, and a common bus line that connects the input / output distribution circuit and the control circuit. .

Further, the invention according to claim 3 comprises a plurality of converter units, a control circuit for controlling the converter units, and an amplification / conversion circuit for converting an output signal of the converter unit and inputting it to the control circuit. In the power converter, the input / output distribution circuit that receives the output signal of the converter unit and outputs it to the control circuit is provided in each converter unit.

[0014]

In the invention described in claim 1, by providing an input / output circuit having a function of relaying to the control circuit for each inverter unit, the control / detection signal between the units can be performed only by the multi-core cable. it can.

In the invention described in claim 2,
Even if the inverter unit is expanded by connecting the amplification / conversion circuit connected to the common bus in parallel or in series for each signal application, if the input / output distribution circuit is added and the common bus is connected, the power conversion device The capacity can be increased.

Further, in the invention according to the third aspect, by providing an input / output distribution circuit having a function of relaying to the control circuit for each converter unit, the control / detection signal between the units is provided only by the multi-core cable. It can be carried out.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the invention described in claim 1 and is a diagram corresponding to FIG. 5 described in the prior art. The same circuit elements as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, the control signal output from the control circuit 10 is input to the input / output distribution circuit 11B via the multi-core cables 13A and 13B, and further input / output distribution circuit via the multi-core cables 12A and 12B. 11A, sends a control signal to each inverter circuit 3A, 3B, and outputs to each detector 4
The detection signals from A, 4B, 5 and 6 are input / output distribution circuit 11
It is input to the control circuit 10 via A and 11B.

FIG. 2 shows an embodiment of the invention described in claim 2 and shows a block diagram of an input / output distribution circuit. In FIG. 2, a signal from the gate generator 10a inside the control circuit 10 is input to the input / output distribution circuit 11A via the multi-core cable 13A, and the amplifier circuit 15 via the common bus 17A and the branch line 17B.
A is amplified to a desired signal level and output. Furthermore, this signal is transmitted from the common bus bar 17A to the multi-core cable 12A.
It is input to the input / output distribution circuit 11B via the, and is amplified and output as described above.

Next, the main circuit detection signal from the conversion circuit 16A is input to the control / protection circuit 10b of the control circuit 10 via the common bus 17A and the multicore cable 12B.
However, this detection signal is connected and set so as not to be connected in parallel on the common bus.

FIG. 3 is a perspective view showing the actual arrangement of the configurations of FIGS. 1 and 2, and the same circuit elements as those of FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 3, the input / output distribution circuits 11A and 11B are attached to the respective inverter boards 32 and 33, connected to the respective voltage / current detectors, and through the multi-core cables 12A and 12B and the multi-core cables 13A and 13B. The control signal of the inverter, which is input to the control circuit 10, is output from the control circuit 10 to the respective inverter circuits 3A and 3B via the input / output distribution circuits 11A and 11B.

Therefore, the inverter board 32 and the input / output board 31
When dividing, the main circuit portion (not shown) is disconnected, and the multi-core cables 13A and 13B connected from the control circuit 10 to the input / output distribution circuit 11A can be separated. Similarly, when dividing the inverter board 32 and the inverter board 33, the main circuit section is removed and the input / output distribution circuits 11A and 11A are separated.
It can be easily divided by simply removing the multi-core cables 12A and 12B connecting B.

Further, as shown by the dotted line, the input / output distribution circuits 11A and 11B are connected to the inverter board 34, which is added on the right side of the inverter board 33, only by partially changing the parallel connection and series connection. Therefore, it is possible to easily cope with an increase in the equipment capacity of the inverter device.

However, the DC input circuit breaker 2, the AC output circuit breaker 7 and the output current detector 5 are installed in advance with capacities corresponding to them in consideration of future expansion. Figure 4
FIG. 3 is a block diagram showing an embodiment of the invention described in claim 3, and corresponds to FIG. 1 and shows a case where it is applied to a forward conversion device.
4, the DC power supply 1 of FIG. 1 is an AC power supply 41, the inverter circuits 3A and 3B are converter circuits 43A and 43B, and the AC current detectors 4A and 4B.
5 has the same configuration except that the current detectors 44A, 44B, 45 for DC and the voltage detector 6 also serves as the voltage detector 46 for DC, and the operation is the same as that described in the inverse converter. Since they are the same, detailed description will be omitted.

The present invention can be applied not only to the inverse conversion device and the forward conversion device alone, but also to a power conversion device such as a frequency conversion device in which the forward conversion device and the inverse conversion device are combined. Further, in the above embodiment,
Although two sets of the inverter circuit and the converter circuit have been described in parallel, they can be applied regardless of the number of parallel connections.

[0026]

As described above, according to the invention of claim 1,
In a power conversion device that includes a plurality of inverter units, a control circuit that controls the inverter units, and an amplification / conversion circuit that converts the output signals of the inverter units and inputs them to the control circuit, the output signals of the inverter units are input. By providing the input / output distribution circuit that outputs to the control circuit to each inverter unit, the control detection signal between the panels is performed only by the multi-core cable via the input / output circuit that has the function of relaying to the control circuit for each inverter unit. As a result, it is possible to obtain a power conversion device in which the units can be easily connected to each other and the specifications can be easily changed.

According to a second aspect of the present invention, a plurality of inverter units, a control circuit for controlling the inverter units, and an amplification / conversion circuit for converting output signals of the inverter units and inputting them to the control circuit. In the power converter including the above, by providing an input / output distribution circuit that receives the output signal of the inverter unit and outputs it to the control circuit and a common bus bar that connects the input / output distribution circuit and the control circuit to each inverter unit, the common bus bar Amplification to connect to
By connecting the conversion circuit in parallel or in series for each signal application, even if the inverter unit is expanded, it is possible to increase the capacity of the inverse conversion device by adding the input / output distribution circuit and connecting the common bus. As a result, it is possible to obtain a power conversion device in which the units can be easily connected to each other and the specifications can be easily changed.

Further, according to the invention of claim 3,
In a power converter having a plurality of converter units, a control circuit for controlling the converter units, and an amplification / conversion circuit for converting the output signals of the converter units and inputting them to the control circuit, the output signals of the converter units are input. By providing each converter unit with an input / output distribution circuit that outputs to the control circuit, by installing an input / output distribution circuit that has a function of relaying to the control circuit for each converter unit, a control / detection signal between the boards can be sent to a multi-core cable. Since it can be performed only by itself, it is easy to connect each unit and it is possible to obtain an inverse conversion device that can easily respond to changes in specifications. It is possible to obtain a power conversion device that can be easily connected and can easily cope with changes in specifications.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a power converter of the invention according to claim 1;

FIG. 2 is a block diagram showing an embodiment of a power conversion device according to a second aspect of the invention.

FIG. 3 is a perspective view showing an embodiment of the power converter of the invention described in claims 1 and 2.

FIG. 4 is a block diagram showing an embodiment of the power converter of the invention according to claim 3;

FIG. 5 is a block diagram showing an example of a conventional power conversion device.

FIG. 6 is a perspective view showing an example of a conventional power conversion device.

[Explanation of symbols]

1 ... DC power supply, 2 ... DC input breaker, 3A, 3B ... Inverter circuit, 4A, 4B ... Inverter current detector, 5 ...
Output current detector, 6 ... Output voltage detector, 7 ... AC output breaker, 8 ... Load, 9 ... Amplification / conversion circuit, 10 ... Control circuit,
11A, 11B ... Input / output distribution circuit, 12A, 12B, 13A, 13B
… Multi-core cable, 15A, 15B… Amplifying circuit, 16A, 16B…
Conversion circuit, 17A ... Common busbar, 17B ... Branching line, 31 ... Input / output board, 32,33,34 ... Inverter board.

Claims (3)

[Claims] 1. A power conversion device comprising a plurality of inverter units, a control circuit for controlling the inverter units, and an amplification / conversion circuit for converting an output signal of the inverter unit and inputting the output signal to the control circuit. An electric power converter comprising: an input / output distribution circuit, which receives an output signal of an inverter unit and outputs the output signal to the control circuit, in each of the inverter units. 2. A power conversion device comprising a plurality of inverter units, a control circuit for controlling the inverter units, and an amplification / conversion circuit for converting an output signal of the inverter unit and inputting the output signal to the control circuit. An electric power converter comprising: an input / output distribution circuit that receives an output signal of an inverter unit and outputs the input signal to the control circuit; and a common bus line that connects the input / output distribution circuit and the control circuit to each of the inverter units. 3. A power conversion device comprising a plurality of converter units, a control circuit for controlling the converter units, and an amplification / conversion circuit for converting an output signal of the converter unit and inputting the converted signal to the control circuit. An electric power converter comprising: an input / output distribution circuit that receives an output signal of a converter unit and outputs the output signal to the control circuit, in each of the converter units.