JP2007282384A - Regenerative reactor evaluation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regenerative reactor evaluation apparatus capable of facilitating reactor design on regenerative converter side as well as various settings on evaluation converter side. <P>SOLUTION: This regenerative reactor evaluation apparatus, including: a DC input power supply portion; a step-up chopper circuit; a step-down chopper circuit; and a control circuit and a test reactor provided at either of the step-up chopper circuit or the step-down chopper circuit, is configured so that a carrier frequency of the step-up chopper circuit and that of the step-down chopper circuit can be individually set. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a regenerative reactor evaluation apparatus that evaluates a reactor used in a power converter such as a DC-DC converter under an actual load condition.

  A conventional reactor evaluation apparatus in an actual load state is shown in FIG. This is an example of a DC-DC converter called a step-up chopper. The converter circuit 3 is composed of a boost chopper circuit similar to that of an actual device, and a test reactor 4 (L1) is connected thereto. The control circuit 5 drives the transistor Q1 so that the converter circuit 3 outputs a constant output voltage according to a given voltage reference. Further, an input DC power supply unit 1 having a predetermined capacity is provided on the input side, and an output load unit 2 including a resistor corresponding to an actual load is installed on the output side. Here, since the converter circuit 3 outputs a constant output voltage, the load power is controlled by the resistance value of the load. Assuming that the load power of this reactor evaluation apparatus is 27 kW, the input DC power supply unit 1 requires a power capacity of 30 kW if the conversion efficiency of the entire drive circuit is 90%. Furthermore, in the output load unit 2, 27 kW of load power is consumed as heat, so a large cooling facility is required.

  As a report example of a new reactor evaluation device, there is Non-Patent Document 1. FIG. 4 shows the regenerative reactor evaluation apparatus proposed here. In this device, a step-down chopper circuit comprising a diode D2, a transistor Q2, and a reactor L2 regenerates power from the output side to the input side. Thereby, the output load part 2 becomes unnecessary. Therefore, heat corresponding to the load power is not generated, and the cooling facility for the output load unit 2 is not required. Further, the input DC power supply unit 1 does not need a power supply capacity corresponding to the load power. In the case of the above-described load power of 27 kW, the necessary power supply capacity here is 6 kW. This 6 kW is a loss generated in the converter circuit 31, and is a total loss of both the step-up chopper circuit composed of the diode D1, the transistor Q1, and the reactor L1, and the step-down chopper circuit composed of D2, Q2, and L2. The electric power regenerated in this device is the product of the input voltage V1 (voltage of the DC input power supply unit 1) and the reactor current I1 (average value) flowing through the test reactor 4. The output voltage V2 and the current I1 are set and controlled by a voltage reference and a current reference supplied to the control circuit 51, respectively.

  The conventional regenerative reactor evaluation apparatus shown in FIG. 4 uses a step-down chopper circuit side as a regenerative converter and a step-up chopper circuit side as an evaluation converter to which a test reactor is connected. It is also possible to reverse this configuration so that the step-up chopper circuit side is a regenerative converter and the step-down chopper circuit side is an evaluation converter to which a test reactor is connected. (Hereafter, of the step-up chopper circuit and the step-down chopper circuit, the circuit to which the test reactor is connected is referred to as an evaluation converter, and the other is referred to as a regenerative converter.)

IEEJ Semiconductor Power Conversion Study Group Material SPC-03-158 (November 2003) Yukihiro Yamamoto, Seiji Ogasawara “Evaluation Equipment for Reactor for Boost Chopper and Consideration for Loss Reduction”

  The conventional regenerative reactor evaluation apparatus shown in FIG. 4 is an extremely excellent system that can greatly reduce the power supply capacity and eliminates the need for an output load section and its cooling equipment, but has the following problems.

  The first problem occurs when many types of reactors having different carrier frequencies are continuously evaluated. Generally, the magnetic core material suitable for the reactor differs depending on the carrier frequency used. Therefore, when the reactors of different magnetic core materials are continuously evaluated, the carrier frequency is also changed. However, since the evaluation converter and the regenerative converter are driven at the same carrier frequency in the regenerative reactor evaluation apparatus of FIG. 4, it is necessary to change the reactor on the regenerative converter side to a magnetic core material suitable for this carrier frequency.

  In the present invention, it is an object to provide a regenerative reactor evaluation apparatus that improves the above-described problems and does not require replacement of reactors on the side of the regenerative converter with a test reactor.

  The present invention has a DC input power supply unit, a step-up chopper circuit, a step-down chopper circuit, and a control circuit, and a regenerative reactor in which a test reactor is installed in either the step-up chopper circuit or the step-down chopper circuit In the evaluation apparatus, the carrier frequency of the step-up chopper circuit and the carrier frequency of the step-down chopper circuit can be individually set. In this regenerative reactor evaluation apparatus, it is not necessary to replace the reactor on the regenerative converter side by step regardless of the characteristics of the test reactor.

  In the regenerative reactor evaluation apparatus of the present invention, it is preferable that the carrier frequency of the circuit on which the test reactor is installed can be arbitrarily set, and the carrier frequency of the other circuit is fixedly set. If only the carrier frequency on the evaluation converter side is set, the evaluation is possible and the handling becomes easy.

The regenerative reactor evaluation apparatus of the present invention includes a control circuit for controlling each setting of a reactor current, an input voltage, an output voltage, and a carrier frequency of a circuit on which a test reactor is installed, and the control circuit. The system console can be configured to be connected to the system.
In the conventional regenerative reactor evaluation apparatus shown in FIG. 4, at least four items of the input voltage V1, the output voltage V2, the reactor current I1, and the carrier frequency must be set. In Non-Patent Document 1, this setting method is not specified, but usually, the resistance value of the variable resistor must be manually adjusted to the predetermined setting value while measuring the above four items with a measuring instrument. However, the above configuration eliminates the need for complicated adjustment work.

  The regenerative reactor evaluation device of the present invention individually sets the carrier frequency on the regenerative converter side and the carrier frequency on the evaluation converter side. Alternatively, the carrier frequency on the regenerative converter side is fixedly set, and the carrier frequency on the evaluation converter side is arbitrarily set. Therefore, even when many types of reactors with different carrier frequencies are to be continuously evaluated, the carrier frequency on the evaluation converter side can be set according to the test reactor 4, and the regenerative converter side can be matched to the existing reactor. It is used with the preset carrier frequency. Therefore, when the reactors of different magnetic core materials are continuously evaluated, there is no need to change the reactor on the regenerative converter side.

Further, by fixing the carrier frequency on the regenerative converter side, it is possible to evaluate if only the carrier frequency on the evaluation converter side is set, and handling becomes easy.
Furthermore, the regenerative reactor evaluation apparatus of the present invention operates the settings of the reactor current, input voltage, output voltage, and carrier frequency on the evaluation converter side from the system console connected to the control circuit. Complete by keying in the value. Therefore, the evaluation operator is freed from the complicated adjustment work of adjusting the variable resistor as in the prior art.

  Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to these examples.

  FIG. 1 shows a configuration circuit diagram of Embodiment 1 of the present invention. In this configuration, the step-up chopper circuit including the diode D1, the transistor Q1, and the reactor L1 serves as an evaluation converter, and the step-down chopper circuit including the diode D2, the transistor Q2, and the reactor L2 serves as a regenerative converter. The capacitors C1 and C2 are shared as input / output capacitors for the step-up chopper circuit and the step-down chopper circuit. Differences from the conventional regenerative reactor evaluation apparatus in FIG. 4 will be described below. In the control circuit 55, the carrier frequency of the regenerative converter unit is fixedly set. The DC input power supply unit 15 outputs the input voltage V1 of the converter circuit 35 according to the V1 control signal from the control circuit 55. Further, a system console 65 is connected to the control circuit 55.

  Although the actual configuration is not shown, the system console 65 is installed in a personal computer connected via a LAN (local area network) cable. The system console 65 is started up on a personal computer, and input voltage setting A, output voltage setting B, reactor current setting C, and carrier frequency setting D of the evaluation converter are input from the keyboard. Thus, the DC input power supply unit 15 receives the V1 control signal from the control circuit 55, supplies the input voltage V1, and the converter circuit 35 operates. The regenerative converter unit is driven at a carrier frequency fixedly set in the control circuit 55, and the evaluation converter unit is driven at a carrier frequency setting D input from the keyboard. Here, the reactor evaluation was performed under the conditions that the input voltage V1 was 300V, the output voltage V2 was 600V, the reactor current I1 was 80A, the carrier frequency on the regenerative converter side was 17kHz, and the carrier frequency on the evaluation converter side was 10kHz. The device was activated.

  FIG. 2 shows a configuration circuit diagram of Embodiment 2 of the present invention. The difference from the first embodiment of FIG. 1 is that the boost chopper circuit side including the diode D1, the transistor Q1, and the reactor L1 is a regenerative converter, and power is regenerated from the input side to the output side. The step-down chopper circuit side including the diode D2, the transistor Q2, and the reactor L2 is an evaluation converter to which the test reactor 4 (L2) is connected. Here again, the reactor evaluation is performed under the same conditions as in the first embodiment, that is, the input voltage V1 is 300 V, the output voltage V2 is 600 V, the reactor current I2 is 80 A, the carrier frequency on the regenerative converter side is 17 kHz, and the carrier frequency on the evaluation converter side is 10 kHz. However, the device worked without any problems.

  In the description of the above-described embodiment, the left side of the converter circuit 35 in the figure is the input and the right side is the output, because the DC input power supply 15 is arranged on the left side and connected to the capacitor C1. . On the contrary, this evaluation apparatus can be operated by a method in which a DC input power supply is arranged on the right side in the drawing and connected to the capacitor C2, and has the same functions and features. In the above-described embodiment, the detection of the reactor current is performed by detecting the current of the test reactor on the evaluation converter side. However, the control is possible even if this is performed by detecting the current of the reactor on the regenerative converter side.

1 is a configuration circuit diagram of a regenerative reactor evaluation apparatus according to an embodiment of the present invention. It is a structure circuit diagram of the regeneration type reactor evaluation apparatus by another Example of this invention. It is a structure circuit diagram of the conventional reactor evaluation apparatus. It is a circuit diagram of a conventional regenerative reactor evaluation apparatus.

Explanation of symbols

1, 15 DC input power supply,
2 output load section,
3, 31, 35 converter circuit,
4 test reactors,
5, 51, 55 control circuit,
65 system console,
A Input voltage setting,
B output voltage setting,
C reactor current setting,
D Carrier frequency setting of evaluation converter

Claims (3)

In a regenerative reactor evaluation apparatus having a DC input power supply unit, a step-up chopper circuit, a step-down chopper circuit, and a control circuit, and installing a test reactor in either the step-up chopper circuit or the step-down chopper circuit, A regenerative reactor evaluation apparatus characterized in that a carrier frequency of a step-up chopper circuit and a carrier frequency of a step-down chopper circuit can be set individually. 2. The regenerative reactor evaluation apparatus according to claim 1, wherein the carrier frequency of the circuit on which the test reactor is installed can be arbitrarily set, and the carrier frequency of the other circuit is fixedly set. The regenerative reactor evaluation apparatus described. A control circuit for controlling each setting of a reactor current, an input voltage, an output voltage, and a carrier frequency of a circuit on which a test reactor is installed, and a system console connected to the control circuit, The regenerative reactor evaluation apparatus according to claim 1 or 2.

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