JP6347364B2 - Power supply system, DC power supply device, and test method using the same - Google Patents

Description

  The present invention relates to a power supply system, a DC power supply device, and a test method using the same.

  Various types of power supply systems are provided for various applications. As an example, in a power supply system used for testing a specimen, in the test, a power obtained by superimposing an alternating current test signal on a DC voltage is applied to the specimen, and a current flowing through a power supply line in the power supply system is supplied thereto. There is a power supply system that detects an installed current sensor and controls a DC voltage according to a detection result.

  An example of this type of power supply system will be described with reference to FIG. FIG. 1 shows a schematic configuration of a power supply system with an AC test signal superposition function as a technique related to the present invention.

  In FIG. 1, the power supply system 10 and the specimen 30 are connected by a cable 40. This assumes that the specimen 30 may be placed in an environment such as a constant temperature room. In such a case, the length of the cable 40 may exceed 10 m.

The power supply system 10 includes an AC / DC converter connected to an AC power supply (not shown) such as a commercial power supply, a conversion unit 11 including a DC / DC converter connected to the AC / DC converter, and a DC power from the conversion unit 11. Current sensor 14 provided on the power supply line 13 connected to the cable 40 via the output terminal 12 and a DC current detection signal detected by the current sensor 14 and also detected on the specimen 30 side. A measurement unit 16 that receives a voltage detection signal via the input terminal 15 and outputs a detection value of DC current and a detection value of DC voltage, and a power supply control unit 17 that controls the conversion unit 11 based on the measurement result from the measurement unit 16. And having. The DC symbol shown in the block of the converter 11 means that the DC / DC converter supplies DC power through the power supply line 13. Further, the AC symbol shown on the DC line means that the AC test signal output unit 11-1 is inserted and connected in the DC / DC converter. That is, the AC test signal output unit 11-1 varies the output voltage of the power supply system (particularly, the DC / DC converter) under the control of the power supply control unit 17, and as a result, the AC test current flows through the cable 40. . The ripple voltage V _ripple (V) that is varied in the AC test signal output unit 11-1 is expressed by the following mathematical formula (1). Formula (1) includes the inductance component L of the cable 40 connecting the power supply system 10 and the specimen 30 as a parameter. Therefore, as represented by the mathematical formula (1 ′), when the inductance component increases due to the type and length of the cable 40, the AC test current flowing through the specimen 30 is attenuated. That is, the AC test current that reaches the specimen 30 varies (attenuates) depending on the type and length of the cable 40 that connects the power supply system 10 and the specimen 30. In the configuration of the power supply system as shown in FIG. 1, output value compensation at the output end of the apparatus (power supply system 10) is general, and there is a problem that output value compensation cannot be performed at the reception end of the specimen 30. there were.
V _ripple = ωLI _ripple = 2πfLI _ripple (1)
I _ripple = V _ripple / 2πfL (1 ′)
Here, f is the ripple frequency (Hz), L is the inductance component of the cable 40, and I is the AC test current (A).

JP 2008-304730 A

  The above problem will be described with reference to a technique different from the power supply system shown in FIG. 1 as a technique related to the present invention, for example, a technique disclosed in Patent Document 1.

  Patent Document 1 describes an image forming apparatus including a power supply device that applies a charging bias in which an AC voltage is superimposed on a DC voltage to a charging roller. Patent Document 1 also provides a micro fixed resistor r as a current detection means on a power supply line, detects an AC current value (effective value) flowing through the charging roller from a voltage applied to both ends of the micro fixed resistor, and feeds back to the control unit. It is disclosed that feedback control is performed.

  However, as described in FIG. 6 of Patent Document 1, the current detection means (micro fixed resistance r) is provided inside the power supply device, and the power supply system shown in FIG. It only shows an equivalent idea and configuration.

  As described above, power supply systems with a function of superimposing an alternating current test signal so far generally perform output value compensation at the output end of the power supply system. In other words, if the received value of the AC test signal is to be compensated for at the receiving end of the specimen, the tester and necessary test equipment are placed on the specimen side to perform measurement, and the power supply system is adjusted based on the measurement result. It is necessary to carry out the test, and variations in the test system occur due to the test environment, for example, the difference in cable length exceeding 10 m.

  However, in various power simulation tests and reproduction tests, since power reproducibility at the receiving end of the specimen is important, a configuration that can automatically adjust the power system is desired.

  Accordingly, an object of the present invention is to provide a power supply system, a DC power supply apparatus, and a test method using the same that solve the problem that output value compensation cannot be performed at the receiving end of a specimen.

  According to the first aspect of the present invention, there is provided a power supply system with an alternating current test signal superimposing function, wherein the power at the receiving end of the specimen in the cable for supplying power including the alternating current test signal to the specimen is described. There is provided a power supply system comprising means for adjusting a current value of an AC test signal.

  According to the second aspect of the present invention, a DC power supply device that outputs power including an AC test signal to a specimen through a cable, the power having a function of superimposing and outputting the AC test signal on a DC voltage. Supply means; current detection means for detecting a current of the AC test signal at the receiving end of the specimen in the cable connected to the power supply means; and the specimen based on a detection signal of the current detection means And a control means for adjusting a current value of the AC test signal at the receiving end of the DC power supply device.

  According to the third aspect of the present invention, the power including the AC test signal is output to the specimen through the cable from the DC power supply device having the power supply means having the function of superimposing and outputting the AC test signal on the DC voltage. And detecting the current of the AC test signal at the receiving end of the specimen in the cable, comparing the detected current value of the AC test signal with a predetermined set value, and depending on the comparison result By controlling the power supply means and adjusting the current value of the AC test signal at the receiving end of the specimen, even in a test environment where the type and length of the cable are different, the AC test signal A test method using a DC power supply device characterized in that the current value is compensated is provided.

  According to the present invention, even in a test environment in which the type and length of the cable connected between the power supply system and the specimen are different, the output value at the specimen receiving end, for example, the AC test current value is compensated. can do.

It is the figure which showed schematic structure of the power supply system with a superimposition function of an alternating current test signal as an example of the technique relevant to this invention. It is a block diagram for demonstrating the power supply system which concerns on the aspect of this invention. It is the figure which showed schematic structure of the power supply system with the superimposition function of an alternating current test signal by embodiment of this invention. FIG. 4 is a flowchart for explaining an operation of compensating an AC test current value at a specimen receiving end by the configuration of the power supply system of FIG. 3.

  As shown in FIG. 2, the power supply system according to the aspect of the present invention is a power supply system with an AC test signal superimposing function, and the cable 40 for supplying power including the AC test signal to the specimen 30. It can be provided as a power supply system including an adjusting unit (adjusting means) 1 for adjusting the current value of the AC test signal at the receiving end of the specimen.

[Configuration of the embodiment]
With reference to FIG. 3, the configuration of the power supply system 20 with an AC test signal superimposing function according to a preferred embodiment of the present invention will be described. Here, description will be made assuming a charge / discharge test system that performs various tests on a rechargeable battery for an electric vehicle. In such a charge / discharge test system, the length of the cable 40 for connecting the power supply system 20 and the specimen 30 exceeds 10 m in order to place the specimen 30 such as a rechargeable battery in an environment such as a temperature-controlled room. As described above, there is a case.

  As specific examples of tests, we assume charge / discharge tests of rechargeable batteries that accompany high-speed and low-speed driving of electric vehicles under various temperature environments in a temperature-controlled room, and charging of rechargeable batteries with various power supply devices. There is a reproduction test when the charging power source contains noise.

  In FIG. 3, the power supply system 20 according to the present embodiment includes an AC / DC converter connected to an AC power supply (not shown) such as a commercial power supply, and a converter (power) including a DC / DC converter connected to the AC / DC converter. Supply means) 21 and a current sensor 24 provided on a power supply line 23 connected to the cable 40 via the output terminal 22 to output DC power from the converter 21. The power supply system 20 also receives a DC current detection signal detected by the current sensor 24, and also receives a voltage detection signal detected by the voltage detection unit 29 (voltage detection means) on the specimen 30 side via the input terminal 25. A measurement unit 26 that outputs a detection value of current and a detection value of DC voltage, and a power supply control unit 27 that controls the conversion unit 21 based on the measurement result from the measurement unit 26 are provided. Measurement unit 26 and power supply control unit 27 may be collectively referred to as control unit 35. The input terminal 25 functions as a voltage detection signal receiving unit.

  The DC symbol and AC symbol shown in the block of the converter 21 are the same as those described in FIG. That is, the AC test signal output unit 21-1 is inserted and connected to a DC supply line using a DC / DC converter. The AC test signal output unit 21-1 varies the output voltage of the power supply system (particularly, the DC / DC converter) with respect to the voltage of the specimen 30 under the control of the power supply control unit 27, and as a result, the cable An AC test current is supplied to 40. That is, the AC test signal output unit 21-1 realizes an AC test current output corresponding to the set AC test current value for the specimen 30.

  The power supply system 20 according to the present embodiment further includes a current sensor unit 28 for an AC test signal, which is installed in the cable 40 close to the specimen 30. The current sensor unit 28 senses the current of the AC test signal and outputs a detection signal to the measurement unit 26. The measurement unit 26 measures the current value of the AC test signal from the detection signal received from the current sensor unit 28, and feeds back the measurement result to the power supply control unit 27. The measurement unit 26 in the present embodiment receives a DC current detection signal from the current sensor 24 and a DC voltage detection signal from the specimen 30, and also receives a current value (digital value) of an AC test signal from the current sensor unit 28. Each measurement result is sent to the power supply control unit 27.

  The current sensor unit 28 is a component of the power supply system 20, but in FIG. 3, it is shown outside the block of the power supply system 20 for convenience of drawing. That is, the current sensor unit 28 is provided in the power supply system 20 and can be installed at an arbitrary place of the cable 40, and sends a detection signal to the measurement unit 26 through the wiring 28-1. Between the current sensor unit 28 and the measuring unit 26, a wiring length that is comparable to that of the cable 40 is required. However, if the detection signal is sent as an analog signal, there is a concern about signal deterioration. Therefore, it is desirable that the current sensor unit 28 converts the detection signal into a digital signal and transmits it. Such a current sensor unit 28 can be realized by the following configuration.

  The current sensor unit 28 converts the current detected by the current sensor into a voltage value, converts the converted signal from analog to digital, and transmits the converted signal to the measurement unit 26. The measurement unit 26 converts the received voltage value into a current value, and sends the current value to the power supply control unit 27. Note that analog / digital conversion sampling is preferably at least twice the AC test signal frequency.

  The power supply control unit 27 increases or decreases the set value for the AC test signal output unit 21-1 according to the measurement result of the current value of the AC test signal by the current sensor unit 28, and the current of the AC test signal by the inductance component L of the cable 40. Correct the attenuation of the value. By repeating the above operation, the power supply system 20 compensates the current value of the AC test signal at the receiving end of the specimen 30.

  Note that the DC current detection signal from the current sensor 24 and the DC voltage detection signal in the specimen 30 are used for controlling the conversion unit 21, particularly the DC / DC converter, by the power supply control unit 27.

  The power supply system 20 having the above-described configuration and action can also be provided as a DC power supply device.

[Operation of the embodiment]
Next, the current compensation operation of the AC test signal at the receiving end of the specimen 30 in the configuration of the power supply system with an AC test signal superposition function shown in FIG. 3 will be described with reference to the flowchart shown in FIG.

  In the DC / DC converter of the converter 21, the AC test current set by the power controller 27 is changed from the AC test signal output unit 21-1 by changing the output voltage under the control of the power controller 27. 30 (step S1). The AC test signal current sensor 28 installed at the receiving end of the specimen 30 senses the AC test current (step S2), converts the detected current value of the AC test signal into a digital signal, and measures the measurement unit 26. Send to. The measuring unit 26 receives the digital signal from the current sensor unit 28 and measures the AC test current value (step S3).

  The power supply control unit 27 compares the measurement result of the AC test current from the measurement unit 26 with the set value of the AC test current, and when the comparison result matches (step S4), the setting operation is completed.

  If the measurement result of the AC test current from the measurement unit 26 is a current value lower than the set value (YES in Step S5), the power supply control unit 27 increases the AC test current with respect to the AC test signal output unit 21-1. (Step S6). On the other hand, if the measurement result of the AC test current from the measurement unit 26 is higher than the set value (NO in step S5), the power supply control unit 27 issues an instruction to reduce the AC test current (step S7). The data is sent to the output unit 21-1. By repeating the above flow, the AC test current value at the receiving end of the specimen 30 can be adjusted, and the output value can be corrected.

  As described above, according to the above embodiment, the AC test current is detected at the receiving end of the specimen, and feedback control of the AC test current is performed using the detected current value (preferably a digital value). As a result, the AC test current value at the receiving end of the specimen can be compensated even in a test environment where the type and length of the cable connecting the power supply system and the specimen are different. Further, it is possible to cover the loss due to the length of the cable connecting the power supply system and the specimen being increased.

  Note that the measuring unit 26 and the power supply control unit 27 can be realized as a control unit by means such as a CPU. In this case, a memory is provided that stores a predetermined control procedure (for example, steps S3 to S7 in FIG. 4) as a control program, and is configured to read the control program from the memory and execute the control procedure during control. Can do.

  The present invention is suitable for application to a battery charging / discharging device such as an electric vehicle.

  As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to the said embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 11, 21 Conversion part 12, 22 Output terminal 13, 23 Power supply line 15, 25 Input terminal 11-1, 21-1 AC test signal output part 29 Voltage detection part 35 Control part

Claims (9)

A power supply system with an AC test signal superimposition function,
Means for adjusting a current value of the AC test signal at a receiving end of the specimen in a cable for supplying power including the AC test signal to the specimen ;
The means for adjusting is
Power supply means having a function of superimposing the AC test signal on a DC voltage and supplying it to the specimen;
Current detecting means for detecting the current of the AC test signal at the receiving end of the specimen in the cable;
Control means for adjusting the current value of the AC test signal at the receiving end of the specimen based on the detection signal of the current detection means;
A power supply system comprising: The current detection means includes
The power supply system according to claim 1, characterized in that sending to the control means in terms of converting the detection signal of the alternating test signal to a digital signal. The control means includes
Measuring means for receiving a detection signal of the current detection means and measuring a current value of the AC test signal;
Power supply control means for comparing the measured value by the measuring means with a predetermined set value, and controlling the power supply means according to the comparison result to adjust the current value of the AC test signal;
The power supply system according to claim 1 or 2 , characterized by comprising: It said means for adjusting further
Voltage detection means installed on the specimen side;
A current sensor installed in a power supply line in the power supply system to be connected to the cable,
The measuring means includes
In addition to the detection signal from the current detection means, the voltage detection signal from the voltage detection means, the current detection signal from the current sensor are received, and the respective measurement results are sent to the power supply control means,
It said power supply control means,
4. The power supply system according to claim 3 , wherein in response to each measurement result, the power supply means is controlled to adjust the current value of the AC test signal and the DC voltage is controlled. A DC power supply device that outputs power including an AC test signal to a specimen through a cable,
Power supply means having a function of superimposing and outputting the AC test signal on a DC voltage;
Current detection means for detecting the current of the AC test signal at the receiving end of the specimen in the cable connected to the power supply means;
Control means for adjusting the current value of the AC test signal at the receiving end of the specimen based on the detection signal of the current detection means;
A direct current power supply device comprising: The current detection means includes
6. The DC power supply apparatus according to claim 5 , wherein a detection signal of the AC test signal is converted into a digital signal and then sent to the control means. The control means includes
Measuring means for receiving a detection signal of the current detection means and measuring a current value of the AC test signal;
Power supply control means for comparing the measured value by the measuring means with a predetermined set value, and controlling the power supply means according to the comparison result to adjust the current value of the AC test signal;
The DC power supply device according to claim 5 or 6 , characterized by comprising: The DC power supplies are further
Means for receiving a voltage detection signal detected on the specimen side;
A DC current sensor installed in a power supply line in the DC power supply device to be connected to the cable, and
The measuring means includes
In addition to the detection signal from the current detection means, the voltage detection signal and the direct current detection signal from the direct current sensor are received, and the respective measurement results are sent to the power supply control means,
It said power supply control means,
8. The DC power supply device according to claim 7 , wherein the DC power supply is controlled while adjusting the current value of the AC test signal by controlling the power supply means in response to the measurement results. The power including the AC test signal is output to the specimen through a cable from a DC power supply device having a power supply means having a function of superimposing and outputting an AC test signal on the DC voltage,
Detecting the current of the AC test signal at the receiving end of the specimen in the cable;
Compare the detected current value of the AC test signal with a preset value,
By controlling the power supply means according to the comparison result and adjusting the current value of the AC test signal at the receiving end of the specimen, even in a test environment with different types and lengths of the cables, A test method using a DC power supply device, wherein the current value of the AC test signal is compensated.

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