JP2006258424A - High-frequency superposition electric power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a large-current electric power supply for superposing high-frequency currents of various waveforms in discharge tests of batteries to be tested. <P>SOLUTION: A first power conversion unit comprises both a first input rectifier for converting received power into a direct current and a converter having both an inverter on the primary side of a high-frequency transformer and a rectifier for conversion into a direct current on its secondary side. A second power conversion means (high-frequency superposition unit) comprises a plurality of parallelly connected high-frequency inverters to shift switching phases in such a way as to offset output ripples; a waveform generating circuit; and a control circuit. An A.C. superposition part comprising both the first power conversion unit and the second power conversion means is connected in parallel via a capacitor to an output terminal of a D.C. charge and discharge device in which reactors are inserted on the output side to superpose high-frequency current waveforms on D.C. charge and discharge currents of batteries to be tested. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-frequency superimposed power supply apparatus used when a battery is subjected to a discharge test with a direct current on which high-frequency currents having various waveforms are superimposed.

  As a conventional technique of this type, Patent Document 1 discloses a technique relating to a power supply for switching elements that can be reduced in size and expand the dynamic range. The gist of the invention disclosed in Patent Document 1 is that the capacity of the main transformer T1 of the charging circuit and the main transformer T2 of the discharging circuit is determined in consideration of the maximum voltage and maximum current of the battery expected to be used. There is a drawback that the power capacity is designed to be large with a margin for actual use and the apparatus becomes large. The invention was made to meet the need to make this compact. The main transformer T2 of the discharge circuit is unnecessary. For this purpose, circuit technology on the primary and secondary sides of the transformer T1 is disclosed.

  In paragraph (0009) of Patent Document 1, a switching element is connected in series to the primary winding of the transformer T1, and a linear variable voltage is applied to the secondary winding of T1 by controlling the on / off time of the switching element. Power supply means, a rectifying means for the output of the means, a constant current means connected to the subsequent stage thereof, and a voltage of, for example, 5V on the secondary winding of T1 when the switching element is turned on / off when the battery is discharged And a constant power supply is realized by adding 5 V to the battery, and in paragraph (0016), “By providing a switching control circuit CNT that controls the on / off time of the switching transistor TSW, The output voltage can be changed linearly on the secondary side of the transformer T1 in paragraph (0020) “To obtain the required current capacity, eg power It is described that will connect the MOS transistors in parallel. " Compared to the conventional example, the transformer T2 of the discharge circuit is an unnecessary charging / discharging device and is an actual example that is miniaturized.

  The above disclosed technology relates to a charging / discharging power supply for switching element application, but it is connected to a DC charging / discharging power supply apparatus (existing) for discharging a DC500V battery at 300 A, which is required in the market. When a device capable of superposing and discharging a peak value of 0 to 20 A such as a triangular wave with a variable frequency of 100 Hz to 20 kHz is desired, it is a technique that is difficult to apply due to the maximum current 320A. The reason is that, in the case of the above disclosed technology in which the power MOS transistors of the main current circuit are connected in parallel, a total of 1 volt for the balance resistor and current detection connected in series to the transistor, 3 volts for the transistor and the wiring, a total of 4 volts Electric power for the voltage is consumed, and the heat generated at this time becomes hot air around the power supply device, which is not good for the installation environment, and since heat generation is a power loss, the operation cost is uneconomical.

“JP-A-6-335176”, name “charge / discharge power supply device”

  The device according to the invention of Patent Document 1 has a drawback that the high-frequency waveform cannot be changed when a discharge test is performed by superimposing a high-frequency current during battery discharge. In addition, heat is generated in the vicinity of the power supply device, which is not good for the installation environment, and heat generation is a power loss. Reduce ripple current that distorts the fundamental wave at high frequency and superimpose a smooth high-frequency waveform, connect to an existing DC 300A power supply device, and superimpose a high frequency with a peak value of 25A to discharge a 500V battery. The peak value 25A can be varied to zero. The frequency of the high-frequency waveform to be superimposed must be variable from 100 Hz to 20 kHz. High frequency waveform to be superimposed can be set to sine wave, triangle wave, square wave, etc. It is an object of the present invention to create a technology capable of providing a power supply that satisfies the above requirements.

Regarding claim 1,
A first power conversion unit formed by a first input rectifier that converts received power into direct current, an inverter on the primary side of the high-frequency transformer, and a converter that has a rectifier that converts it into direct current on the secondary side, and in parallel An AC superposition unit formed by a plurality of high-frequency inverter units that are connected to shift the switching phase so as to cancel output ripple, and a second power conversion means (high-frequency superposition unit) having a waveform generation circuit and a control circuit is provided. The DC charging / discharging device is connected in parallel to the output terminal of the DC charging / discharging device through a capacitor and connected to a battery as a device under test, and the charging / discharging waveform of the battery is formed as a DC superimposed with a high-frequency current waveform. A high-frequency superimposed power supply device characterized by

Regarding claim 2,
A plurality of high-frequency inverter units forming the second power conversion means are configured by bridge-connected semiconductor switching elements, and are controlled by a two-phase high-speed PWM driven by a signal having a phase difference of 90 degrees. 2. The high frequency superimposed power supply device according to claim 1, wherein the combined waveform of the outputs of the plurality of high frequency inverters is a high frequency inverter having a smooth output waveform in which ripples contained in each of the high frequency inverter outputs are offset.

Regarding claim 3,
The bridge-connected semiconductor switching elements constituting the plurality of high-frequency inverter units forming the second power conversion means are MOS transistors or IGBTs, which are driven by a peak value command signal, a waveform switching signal, and a frequency command signal, The high frequency superimposed power supply apparatus according to claim 1 or 2, wherein the high value, waveform, and frequency are switched so as to be settable.

Regarding claim 4,
The combined output of a plurality of high-frequency inverter units forming the second power conversion means can set the frequency to a variable sine wave, triangular wave, or square wave from 100 Hz to 20 kHz, and can set the waveform such as a sine wave, triangular wave, or square wave. 4. The high frequency superimposed power supply device according to claim 1, wherein the high frequency power supply device is generated by switching with a digital signal.

Regarding claim 5,
A frequency command signal generator for commanding the frequency of the outputs of a plurality of high-frequency inverter units forming the second power conversion means, a waveform switching command signal generator for switching and commanding to a sine wave, triangle wave, square wave, and output peak value 5. The high frequency superimposed power supply device according to claim 1, further comprising a peak value command signal generator for commanding and being coupled to a waveform generation circuit.

Regarding claim 6,
The number N of high-frequency inverter units forming the second power conversion means is configured by bridge-connected semiconductor switching elements, and is controlled by high-speed PWM driven by a signal having a phase difference of (180 / N) degrees. 2. The high-frequency superimposed power supply apparatus according to claim 1, wherein the combined waveform of a plurality of high-frequency inverter outputs is a high-frequency inverter having a smooth output waveform with ripples included in each high-frequency inverter output offset.

Regarding claim 7,
The DC charging / discharging device according to claim 1 is a DC charging / discharging device in which a high-frequency AC blocking reactor is inserted in an output line, and the AC superimposing unit includes a capacitor at an output terminal of the DC charging / discharging device. And connected to a battery which is a device under test, and the discharge waveform of the battery is formed as a direct current superimposed with a high frequency current waveform.

The apparatus according to one embodiment of the present invention will be described with reference to FIGS.
A first input rectifier 1 that converts received power into direct current, a converter 5 having an inverter 3 on the primary side of the high-frequency transformer 2 and a rectifier 4 that converts the direct current into direct current on the secondary side form a first power conversion unit 6. Is done. A second power conversion means (AC high frequency superposition unit) 10 is formed by a plurality of high frequency inverter units 7 that are connected in parallel and whose switching phase is shifted so as to cancel out the output ripple, the waveform generation circuit 8, and the control circuit 9. Is done. A second power conversion means (referred to as AC high frequency superposition unit) 10 is connected to the first power conversion unit 6 to form an AC superposition unit 12. When the AC superimposing unit 12 is connected in parallel to the output terminal 13 of the DC charging / discharging device 11 and the device under test (battery) 15 is further connected, the charging / discharging current waveform of the battery is a DC in which a high-frequency current waveform is superimposed. Formed as.

  When the AC superimposing unit 12 is connected in parallel to the output terminal 13 of the DC charging / discharging device 11, high frequency blocking is performed for the purpose of preventing the high frequency AC current of the AC superimposing unit 12 from escaping to the DC charging / discharging device 11. The reactor L is connected in series to the output side line of the DC charging / discharging device 11. In order to prevent the direct current from the direct current charging / discharging device 11 from escaping to the alternating current superimposing unit 12, a capacitor 14 is connected in series to the output side line of the alternating current superimposing unit 12.

  A waveform switching signal of a digital signal is transmitted from the waveform switching signal generator 16 connected to the waveform generating circuit 8, and the signal of the waveform generating circuit 8 according to, for example, a sine wave, a triangular wave, or a square wave signal by the digital signal. Is transmitted to the control circuit 9 to control the drive signal to the high frequency inverter unit 7 to generate a trigger signal having a commanded waveform, and the high frequency inverter unit outputs it. A peak value is designated by a digital signal from the peak value command signal generator 17 and transmitted to the control circuit 9 to control a drive signal to the high frequency inverter unit 7 to generate a peak value trigger signal which is commanded. Is output. A frequency is designated by a digital signal from the frequency command signal generator 18 and transmitted to the control circuit 9 to control a drive signal to the high frequency inverter unit 7 to generate a commanded frequency trigger signal, which is output by the high frequency inverter unit. .

  Referring to FIG. 3, the operation of the apparatus according to the embodiment of the present invention will be described. The high frequency inverter 7 of the AC high frequency superposition unit 10 is composed of a bridge-connected IGBT or a power MOS, Receiving the PWM signal waveforms 181 and 182, the output waveforms 191 and 192 of the high-frequency inverter become waveforms having a ripple of 200 kHz. When the output waveforms 191 and 192 are synthesized by shifting the phase by 90 degrees between the signal waveforms 181 and 182, the synthesized output waveform 193 is a smooth high-frequency waveform with the ripples canceled out. When the input of the high frequency inverter unit 7 is, for example, DC 150 V and each output current of the high frequency inverter is AC 10A, the combined output can be varied from 100 Hz to 20 kHz with AC 20A by the peak value command signal and the frequency command signal. A digital signal waveform switching signal can be set and output such as a sine wave, a triangular wave, or a square wave. Thus, the high frequency alternating current waveform could be superimposed on the DC output of the existing charging / discharging device at low cost by the capacitor coupling.

  The plurality of high-frequency inverter units 7 are composed of IGBTs or power MOSs connected in a bridge, and receive PWM signal waveforms 181 and 182 of 100 kHz, for example, from the waveform generation circuit 8, and output waveforms 191 and 192 of the high-frequency inverter have 200 kHz When the two-phase AC generation is performed by synthesizing and outputting the output waveforms 191 and 192 by shifting the phase by 90 degrees between the signal waveforms 181 and 182, the waveform has a ripple. PWM control is being executed. The synthesized output waveform 193 becomes a smooth high-frequency waveform with the ripples canceled out.

  For example, when three sets of high frequency inverter units are operated in parallel, the plurality of high frequency inverter units 7 shift the phase by 90 degrees between the respective drive signals and synthesize and output the output waveforms of the respective inverter units. Ripple cancels out, resulting in a smooth high-frequency waveform. Therefore, when the number of inverter units is N, it is possible to output a smooth high frequency by synthesizing the output waveform by shifting the phase between the drive signals by a frequency of 180 degrees / N.

  Connect to an existing DC 300A power supply and discharge a 500V battery by superimposing a high frequency with a peak value of 25A. The peak value 25A can be varied to zero. The frequency of the high-frequency waveform to be superimposed must be variable from 100 Hz to 20 kHz. High frequency waveform to be superimposed can be set to sine wave, triangle wave, square wave, etc. A technology capable of providing a power supply that satisfies the above requirements has been created by the present invention.

  A power supply device that eliminates the disadvantages of being unable to change the waveform of the high frequency when performing a discharge test by superimposing a high frequency current when charging / discharging the device under test, reducing power loss, and making resources uneconomical. We were able to provide it cheaply.

It is a principal part detail drawing by 1st Embodiment by this invention. 1 is a circuit block diagram showing a first embodiment according to the present invention. FIG. 6 is a detailed operation diagram according to the first embodiment of the present invention;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st input rectifier 2 High frequency transformer 3 Inverter 4 Rectifier 5 Converter 6 1st power conversion unit 7 High frequency inverter unit 8 Waveform generation circuit 9 Control circuit 10 2nd power conversion means (AC high frequency superposition unit)
11 DC Charge / Discharge Device 12 AC Superimposition Unit 13 Output Terminal 14 Capacitor 15 Specimen (Battery)
16 waveform switching signal generator 17 peak value command signal generator 18 frequency command signal generator 181 signal waveform 182 signal waveform 191 output waveform 192 output waveform 193 composite output waveform L high frequency blocking reactor

Claims (7)

A first power conversion unit formed by a first input rectifier that converts received power into direct current, an inverter on the primary side of the high-frequency transformer, and a converter that has a rectifier that converts it into direct current on the secondary side, and in parallel An AC superposition unit formed by a plurality of high-frequency inverter units that are connected to shift the switching phase so as to cancel output ripple, and a second power conversion means (high-frequency superposition unit) having a waveform generation circuit and a control circuit is provided. The DC charging / discharging device is connected in parallel through a capacitor to the output terminal of the DC charging / discharging device, connected to the battery being tested, and a DC current is formed by superimposing a high-frequency current waveform as the charging / discharging waveform of the battery. A high-frequency superimposed power supply device characterized by that.
A plurality of high-frequency inverter units forming the second power conversion means are configured by bridge-connected semiconductor switching elements, and are controlled by a two-phase high-speed PWM driven by a signal having a phase difference of 90 degrees. The high-frequency superimposed power supply apparatus according to claim 1, wherein the combined waveform of the outputs of the plurality of high-frequency inverter units is a high-frequency inverter having a smooth output waveform in which ripples included in the outputs of the respective high-frequency inverter units are offset.
The bridge-connected semiconductor switching elements constituting the plurality of high-frequency inverter units forming the second power conversion means are MOS transistors or IGBTs, and are driven by a peak value command signal, a waveform switching signal, and a frequency command signal. The high frequency superimposed power supply apparatus according to claim 1 or 2, wherein the high value, waveform, and frequency are switched so as to be settable and generated.
The combined output of a plurality of high-frequency inverter units forming the second power conversion means can set the frequency to a variable sine wave, triangular wave, or square wave from 100 Hz to 20 kHz, and can set the waveform such as a sine wave, triangular wave, or square wave. 4. The high frequency superimposed power supply apparatus according to claim 1, wherein the high frequency power supply apparatus is generated by switching with a digital signal.
A frequency command signal generator for commanding the frequency of the outputs of a plurality of high-frequency inverter units forming the second power conversion means, a waveform switching command signal generator for switching and commanding to a sine wave, triangle wave, square wave, and output peak value 5. The high frequency superimposed power supply apparatus according to claim 1, further comprising a peak value command signal generator for commanding and being coupled to a waveform generating circuit.
The number N of high-frequency inverter units forming the second power conversion means is configured by bridge-connected semiconductor switching elements, and is controlled by high-speed PWM driven by a signal having a phase difference of (180 / N) degrees. 2. The high-frequency superimposed power supply apparatus according to claim 1, wherein the combined waveform of the outputs of the plurality of high-frequency inverter units is a high-frequency inverter having a smooth output waveform in which ripples included in the outputs of the respective high-frequency inverter units are offset.
  The direct current charging / discharging device according to claim 1 is a direct current charging / discharging device in which a reactor for preventing high frequency alternating current is inserted in an output line, and the alternating current superimposing unit is a capacitor at an output terminal of the direct current charging / discharging device. A high-frequency superimposed power supply apparatus, characterized in that a DC current is formed by superimposing a high-frequency current waveform as a discharge waveform of the battery, connected in parallel through a battery and connected to a battery as a device under test.

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