JP4781927B2 - Power supply apparatus and power supply method - Google Patents

Description

  The present invention relates to a power supply apparatus and a power supply method.

Conventionally, a power supply device that controls the input voltage of a load that consumes a large amount of power is known (Patent Document 1). In this power supply apparatus, in addition to the power supply wiring for the load, a measurement wiring for measuring the input voltage of the load is laid. A thin wiring is used as the measurement wiring.
The power supply device compares the voltage value measured by the measurement wiring with a preset voltage value, and the voltage value measured by the measurement wiring becomes a preset voltage value. The output voltage is adjusted.
JP-A-9-305245

However, in the conventional power supply apparatus, since the input voltage of the load is measured using the measurement wiring, there is a problem that the measurement wiring may be disconnected. When the measurement wiring is disconnected, there is a problem in that appropriate power cannot be supplied from the power supply device to the load.
Further, in the conventional power supply device, it is necessary to lay measurement wiring at the input end of the load on the premise that power is supplied from the power supply device to the load.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide appropriate power from the power supply device to the load without laying a measurement wiring for measuring the input voltage of the load. An object is to provide a power supply apparatus and a power supply method that can be supplied.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is a power supply device for supplying power to a load, wherein a diameter, a material, and a length of a wiring connected to the load are provided. Input unit, unit resistance value storage unit for storing in advance a unit resistance value that is a resistance value per unit length according to the diameter and material of the wiring, and the maximum voltage value that can be input by the load Load input voltage maximum set value storage means for storing the load input voltage maximum set value in advance, current value meter side means for measuring the current value of the current output to the load via the wiring, and via the wiring Voltage value measuring means for measuring the voltage value of the voltage output to the load, unit resistance values corresponding to the diameter and material inputted to the input means are read from the unit resistance value storage means, and the unit resistance value Is input to the input means. A value obtained by subtracting a value obtained by multiplying the wiring resistance and the current value from the voltage value measured by the voltage measuring means. The load input voltage value calculating means for calculating the input voltage value of the load, and the input voltage value calculated by the load input voltage value calculating means is the load input voltage maximum setting stored by the load input voltage maximum setting value storage means And a voltage control unit that controls a voltage output to the load so as to be a value.

  The load input voltage value calculating means may be a load input voltage value obtained by subtracting a value obtained by multiplying the wiring resistance and the current value from a voltage value measured by the voltage measuring means. A value is calculated for each of a plurality of loads connected to the self-power supply device, and the voltage control unit calculates the voltage value measured by the voltage value measurement unit for each of a plurality of loads calculated by the load input voltage value calculation unit. 2. The power supply device according to claim 1, wherein the voltage output to the plurality of loads is controlled so as to be a minimum load input voltage value among the plurality of load input voltage values.

  The invention according to claim 3 is characterized in that the load input voltage maximum set value storage means stores the maximum value of the rated voltage of the load as the load input voltage maximum set value. 2. The power supply device according to 2.

  According to a fourth aspect of the present invention, there is provided a power supply method for supplying power to a load, wherein a first step of inputting a diameter, a material, and a length of a wiring connected to the load by an input means; A second step of previously storing a unit resistance value, which is a resistance value per unit length corresponding to the diameter and material of the unit, in the unit resistance value storage means, and a load input that is the maximum voltage value that can be input by the load A third step of storing the maximum voltage set value in the load input voltage maximum set value storage means in advance, and a fourth step of measuring the current value of the current output to the load via the wiring by the current value meter side means And a fifth step of measuring a voltage value of a voltage output to the load via the wiring by a voltage value measuring unit, and a unit resistance value corresponding to a diameter and a material input by the input unit as the unit Resistance value memory A wiring resistance that is a resistance of the wiring by the wiring resistance value calculating means by multiplying the unit resistance value by the length input to the input means, and the wiring resistance and the current A load input voltage value calculating unit that calculates a load input voltage value that is a value obtained by subtracting a value obtained by multiplying the value from the voltage value measured by the voltage measuring unit; and the load input voltage value calculating unit calculates And an eighth step of controlling the voltage output to the load so that the input voltage value to be the load input voltage maximum set value stored in the load input voltage maximum set value storage means It is a supply method.

In the present invention, the diameter, material and length of the wiring connected to the load are input by the input means, the unit resistance value is stored in advance in the unit resistance value storage means, and the load input voltage maximum setting value is set in advance as the load input voltage maximum setting. Store in the value storage means, measure the current value of the current output to the load via the wiring by the current value meter side means, measure the voltage value of the voltage output to the load via the wiring by the voltage value measurement means, The unit resistance value corresponding to the diameter and material input by the input unit is read from the unit resistance value storage unit, and the unit resistance value is multiplied by the length input to the input unit to thereby calculate the wiring resistance as the wiring resistance. The load input voltage value calculating means calculates the load input voltage value, which is a value obtained by subtracting the value obtained by multiplying the wiring resistance and the current value from the voltage value measured by the voltage measuring means, and calculating the load input voltage value calculating means. Voltage value the voltage value calculating means calculates the load input voltage maximum setting value storing means is adapted to control the voltage control means so that the load input voltage maximum setting value stored.
As a result, the power of the load input voltage maximum setting value, which is the maximum voltage value that can be input by the load, is transferred from the power supply device to the load without laying the measurement wiring for measuring the input voltage of the load. Can be supplied.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a power supply apparatus 10 according to an embodiment of the present invention. The power supply apparatus 10 includes an input unit 11 (input unit), a power conversion unit 12 (voltage control unit), a control unit 13, a storage unit 14 (unit resistance value storage unit, load input voltage maximum set value storage unit, load input voltage). A value calculation unit), a calculation unit 15 (wiring resistance value calculation unit), a voltage detection unit 16 (voltage value measurement unit), a current detection unit 17, and current value measurement units 18a and 18b (current value meter side unit). .
A power supply 30 is connected to the input terminals p41 and p42 of the power supply apparatus 10. Moreover, the load 21 is connected to the output terminals p43 and p44 of the power supply apparatus 10, and the load 22 is connected to the output terminals p45 and p46.

The input unit 11 is an input device such as a keyboard, and is connected to the control unit 13. Based on the operation of the administrator of the power supply apparatus 10 or the like, the input unit 11 receives wiring information that is information on the diameter, material, and length of the wiring h11 and the wiring h21. The wiring h11 and the wiring h12 form one set, and the diameter, material, and length of the wiring h12 are the same as those of the wiring h11. Also,
The wiring h21 and the wiring h22 form one set, and the diameter, material, and length of the wiring h22 are the same as those of the wiring h21.
The wiring h11 connects the output terminal p11 of the power conversion unit 12 and the input terminal p21 of the load 21. The wiring h12 connects the output terminal p12 of the power converter 12 and the input terminal p22 of the load 21. Length and the length of the wiring h12 wiring h11 are the same and are _{L 1.}
The wiring h21 connects the output terminal p11 of the power conversion unit 12 and the input terminal p31 of the load 22. The wiring h22 connects the output terminal p12 of the power conversion unit 12 and the input terminal p32 of the load 22. The length of the wiring h21 is the length of the wiring h22 are the same, a _{L 2.}

The power conversion unit 12 is connected to the input terminals p41 and p42, the output terminals p43 and p44, and the output terminals p45 and p46 of the power supply device 10. The power conversion unit 12 is connected to the control unit 13. The power conversion unit 12 receives supply of power from a power source 30 such as a commercial power source, changes the voltage based on the control of the control unit 13, and outputs the voltage to the load 21 and the load 22.
The control unit 13 is connected to the input unit 11, the power conversion unit 12, the storage unit 14, and the calculation unit 15. The control unit 13 determines the voltage V _O between the output terminal p11 and the output terminal p12 of the power conversion unit 12 so that the load input terminal voltage V _LI calculated by the calculation unit 15 becomes the load input voltage maximum setting value V _HI. To control.
The load input voltage maximum set value V _HI is the maximum voltage value that can be input by the load. Here, it is assumed that the load input terminal voltage V _LI of the load 21 is V _LI1 and the load input terminal voltage V _LI of the load 22 is V _LI2 . Further, the load input voltage maximum set value V _HI of the load 21 is set to V _HI1, and the load input voltage maximum set value V _HI of the load 22 is set to V _HI2 .

  The storage unit 14 is connected to the control unit 13 and the calculation unit 15. The storage unit 14 stores unit resistance values, which are resistance values per unit length corresponding to the diameters and materials of various wirings, as a unit resistance value storage table (see FIG. 2 described later). The storage unit 14 stores the load input voltage maximum setting values of the load 21 and the load 22 to which the power supply apparatus 10 supplies power as a load input voltage maximum setting value storage table t2 (see FIG. 3 described later). Note that the maximum load input voltage setting value refers to the maximum voltage value that can be input to the load.

FIG. 2 is a diagram illustrating an example of the unit resistance value storage table t1 stored in the storage unit 14 according to the embodiment of the present invention. The unit resistance value storage table t1, wire identification number (such as 0001), the material of the wiring (such as _{M 1),} (such as [Phi ₁ (mm)) wiring diameter and the resistance value per unit wiring length units Resistance values (such as r _L1 (Ω / km)) are recorded in association with each other. By using this unit resistance value storage table t1, if the material and diameter of the wiring are known, the unit resistance value of the wiring can be obtained.

FIG. 3 is a diagram showing an example of the load input voltage maximum setting value storage table t2 stored in the storage unit 14 according to the embodiment of the present invention. The load input voltage maximum set value storage table t2 records the load input voltage maximum set value for each load. Here, V ₂₁ is recorded as the load input voltage maximum set value in the load 21, and V ₂₂ is recorded as the load input voltage maximum set value in the load 22.

The calculation unit 15 is connected to the control unit 13, the storage unit 14, and the voltage detection unit 16. The calculation unit 15 inputs the unit resistance value r _L1 corresponding to the material M ₁ and the diameter Φ ₁ of the wirings h 11 and h 12 input to the input unit 11 and output from the control unit 13, and the unit resistance value storage table t ₁ of the storage unit 14. Read from.
In addition, the calculation unit 15 uses the unit resistance value r _L2 corresponding to the material M ₂ and the diameter Φ ₂ of the wiring h 21 and the wiring h 22 that are input to the input unit 11 and output from the control unit 13 as unit resistance values of the storage unit 14. Read from storage table t1.

The calculation unit 15, the length _{L 1} of the wiring h11 and h12 are outputted from the input control unit 13 to the input unit 11, on the basis of the unit resistance value _{r L1,} wiring h11 and wiring resistance value of h12 R _L1 (= r _L1 × L ₁ ) is calculated.
The calculation unit 15, the length _{L 2} of the wiring h21 and h22 are output from the input unit 11 is input to the control unit 13, on the basis of the unit resistance value _{r L2,} wiring h21 and wiring resistance value of h22 R _L2 (= r _L2 × L ₂ ) is calculated.

Further, the calculation unit 15 calculates the load input terminal voltage V _LI1 (=) based on the voltage V _O output from the voltage detection unit 16, the current I _L1 output from the current detection unit 17, and the resistance value R _L1. V _O -R _L1 × I _L1 ) is calculated.
In addition, the calculation unit 15 calculates the load input terminal voltage V _LI2 (=) based on the voltage V _O output from the voltage detection unit 16, the current I _L2 output from the current detection unit 17, and the resistance value R _L2. V _O -R _L2 × I _L2 ) is calculated.

The voltage detection unit 16 is connected to the calculation unit 15. The voltage detection unit 16 measures the voltage V _O between the terminal p11 and the terminal p12 of the power conversion unit 12 and outputs it to the calculation unit 15.
The current detection unit 17 is connected to the calculation unit 15. The current detection unit 17 measures the current value _IL1 of the current flowing through the wiring h11 measured by the current value measurement unit 18a and outputs the current value _IL1 to the calculation unit 15. Further, the current detecting section 17 measures a current value _{I L2} of the current flowing through the wiring h21 current value measuring unit 18b is measured, and outputs the calculation unit 15.
The current value measuring units 18a and 18b are elements that measure currents flowing through the wirings h11 and h21, respectively, and are, for example, shunt resistors, Hall CT (Current. Transformer) elements, and the like. Here, the current value measuring unit 18a is connected to the wiring h11 and the current value measuring unit 18b is connected to the wiring h21. However, the present invention is not limited to this. For example, the current value of the current flowing through the wiring h21 can be obtained by subtracting the current value measured by the current measuring unit 18a from the current value of the current output by the power conversion unit 12 without installing the current value measuring unit 18b. You may ask for it.

FIG. 4 is a flowchart showing processing of the power supply apparatus 10 according to the embodiment of the present invention. Note that the processing for the load 22 is the same as the processing for the load 21, and thus the description of the load 22 is omitted in FIG. 4.
First, the load input voltage maximum set value storage table t2 (FIG. 3) is recorded in advance in the storage unit 14 (step S01). In addition, the load input voltage maximum set value V _HI1 that is the maximum voltage value that can be input to the load 21 is recorded in the storage unit 14 (step S01). The load input voltage maximum set value storage table t <b> 2 is input from the input unit 11 and recorded in the storage unit 14 by the control unit 13.

  In addition, although FIG. 3 demonstrates the case where the load input voltage maximum setting value in each load is recorded on the load input voltage maximum setting value storage table t2, it is not limited to this. For example, information on the load input voltage range (lower limit voltage, rated voltage, upper limit voltage) at each load may be recorded together with the load input voltage maximum set value at each load in the load input voltage maximum set value storage table t2.

  Further, the unit resistance value storage table t1 (FIG. 2) is recorded in advance in the storage unit 14 (step S02). The unit resistance value storage table t1 is input from the input unit 11 and recorded in the storage unit 14 by the control unit 13.

The material M ₁ , diameter Φ ₁ , and length L _{1 of} the wiring h11 are input to the input unit 11 as wiring information by an administrator or the like (step S03). The calculation unit 15 reads the unit resistance value r _L1 corresponding to the material M ₁ and the diameter Φ ₁ input in step S03 from the unit resistance value storage table t1.
The calculating unit 15 calculates the resistance value R _L1 (= r _L1 × L ₁ ) of the wirings h11 and h12 by multiplying the unit resistance value r _L1 by the length L ₁ input in step S03 ( Step S04).

Then, the current detection unit 17 measures the current value _IL1 of the current flowing through the wiring h11 (Step S05) and outputs it to the calculation unit 15.
The calculation unit 15 calculates a voltage drop value R _L1 × I _L1 in the wiring h11 by multiplying the resistance value R _L1 calculated in step S04 and the current value I _L1 measured in step S05 (step S06). .
The voltage detection unit 16 measures the output voltage V _O that is the voltage between the output terminal p11 and the output terminal p12 of the power conversion unit 12 (step S07) and outputs it to the calculation unit 15.

Then, the calculation unit 14 subtracts the voltage drop value R _L1 × I _L1 calculated in step S06 from the output voltage V _O measured in step S06, so that the load input terminal voltage V _LI1 (= V _O −R _L1 XI _L1 ) is calculated (step S08).
The control unit 13 determines whether or not the load input terminal voltage V _LI1 calculated in step S08 is equal to the load input voltage maximum set value V _HI1 recorded in the recording unit 14 in step S01 (step S09). When the load input voltage _{V LI1} is equal to the load input voltage maximum set value _{V HI1} makes a judgment of "YES" in step S09, and ends the processing of the flowchart of FIG. On the other hand, when the load input terminal voltage V _LI1 is not equal to the load input voltage maximum set value V _HI1 , “NO” is determined in step S09, and the control unit 13 controls the power conversion unit 12 to The output voltage V _O is adjusted so that the end voltage V _LI1 (= V _O −R _L1 × I _L1 ) becomes equal to the load input voltage maximum set value V _HI1 (step S10).

When a plurality of loads are connected to the power supply apparatus 10, in step S10 of FIG. 7, the control unit 13 sets the load input voltage maximum setting values (V _HI1 , V _HI1 ,...) At the plurality of loads. The output voltage V _O is adjusted so that the smallest load input voltage maximum set value becomes equal to the load input terminal voltage. By performing the adjustment in this way, it is possible to prevent the load input terminal voltage exceeding the load input voltage maximum set value from being supplied to some of the plurality of loads.

If the power supply device 10 according to the embodiment of the present invention described above is used, the load input voltage maximum which is the maximum voltage value that can be input to the load without laying a measurement wiring for measuring the input voltage of the load. The power of the set value can be supplied from the power supply device 10 to the load.
Further, since it is not necessary to lay the measurement wiring between the power supply device 10 and the load, it is possible to prevent the power supply device 10 from supplying appropriate power to the load by cutting the measurement wiring. be able to.
In addition, since power is supplied from the power supply device 10 to the load using a high voltage that is equal to or higher than the load input voltage maximum set value, power loss in the wiring between the power supply device 10 and the load can be reduced. it can.

  In the above description of the embodiment of the present invention (see FIG. 1), the case where two loads (the load 21 and the load 22) are connected to the power supply apparatus 10 has been described, but the configuration is limited to such a configuration. Instead of this, three or more loads may be connected to the power supply apparatus 10.

  In the embodiment described above, a program for realizing the function of the control unit 13 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. The power supply device 10 may be controlled by the above. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

It is a block diagram which shows the structure of the electric power supply apparatus 10 by embodiment of this invention. It is a figure which shows an example of the unit resistance value storage table t1 which the memory | storage part 14 by embodiment of this invention memorize | stores. It is a figure which shows an example of the load input voltage maximum setting value storage table t2 which the memory | storage part 14 by embodiment of this invention memorize | stores. It is a flowchart which shows the process of the electric power supply apparatus 10 by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric power supply apparatus, 11 ... Input part, 12 ... Power conversion part, 13 ... Control part, 14 ... Memory | storage part, 15 ... Calculation part, 16 ... Voltage detection 17, current detection unit 18 a, 18 b current value measurement unit 21, 22 load, 30 power source

Claims (4)

A power supply device for supplying power to a load,
Input means for inputting the diameter, material and length of the wiring connected to the load;
Unit resistance value storage means for storing in advance a unit resistance value which is a resistance value per unit length according to the diameter and material of the wiring;
Load input voltage maximum set value storage means for storing in advance a load input voltage maximum set value that is the maximum voltage value that can be input by the load; and
Current value meter side means for measuring the current value of the current output to the load via the wiring;
Voltage value measuring means for measuring the voltage value of the voltage output to the load via the wiring;
The unit resistance value corresponding to the diameter and material input to the input means is read from the unit resistance value storage means, and the unit resistance value is multiplied by the length input to the input means to obtain the resistance of the wiring. Wiring resistance value calculating means for calculating a certain wiring resistance;
Load input voltage value calculating means for calculating an input voltage value of the load, which is a value obtained by subtracting a value obtained by multiplying the wiring resistance and the current value from a voltage value measured by the voltage measuring means;
Voltage control means for controlling the voltage output to the load so that the input voltage value calculated by the load input voltage value calculation means becomes the load input voltage maximum setting value stored by the load input voltage maximum setting value storage means;
A power supply device comprising: The load input voltage value calculating means is connected to a self-power supply device with a load input voltage value that is a value obtained by subtracting a value obtained by multiplying the wiring resistance and the current value from a voltage value measured by the voltage measuring means. For each load,
The voltage control means is configured such that the voltage value measured by the voltage value measurement means is the minimum load input voltage value among the load input voltage values for each of the plurality of loads calculated by the load input voltage value calculation means. The power supply apparatus according to claim 1, wherein a voltage output to a plurality of loads is controlled.   The power supply apparatus according to claim 1 or 2, wherein the load input voltage maximum set value storage means stores a maximum value of a rated voltage of the load as the load input voltage maximum set value. A power supply method for supplying power to a load,
A first step of inputting the diameter, material and length of the wiring connected to the load by an input means;
A second step of previously storing a unit resistance value, which is a resistance value per unit length according to the diameter and material of the wiring, in the unit resistance value storage means;
A third step of previously storing a load input voltage maximum set value, which is a maximum voltage value that can be input by the load, in the load input voltage maximum set value storage means;
A fourth step of measuring a current value of a current output to the load via the wiring by means of a current meter side;
A fifth step of measuring a voltage value of a voltage output to the load via the wiring by a voltage value measuring unit;
The unit resistance value corresponding to the diameter and material input by the input means is read from the unit resistance value storage means, and the unit resistance value is multiplied by the length input to the input means to obtain the resistance of the wiring. A sixth step of calculating a certain wiring resistance by the wiring resistance value calculating means;
A seventh step of calculating, by the load input voltage value calculating means, a load input voltage value that is a value obtained by subtracting a value obtained by multiplying the wiring resistance and the current value from a voltage value measured by the voltage measuring means;
An eighth step of controlling the voltage output to the load so that the input voltage value calculated by the load input voltage value calculating means becomes the load input voltage maximum setting value stored in the load input voltage maximum setting value storage means; ,
The power supply method characterized by performing.

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