Loading patent…
AssigneesToshiba Mitsubishi-Electric Industrial Systems Corporation, Kobe Electric Industry Inc.
InventorsEduardo Kazuhide Sato, Masahiro Kinoshita, Yushin Yamamoto, Tatsuaki Amboh, Yasuhiro Yabunishi
Estimating the term…
In a power conversion device, reactors in an AC input filter absorbing a voltage at a carrier frequency of a PWM converter and reactors in an AC output filter absorbing a voltage at a carrier frequency of a PWM inverter include one six-leg six-phase iron core reactor. Accordingly, the device can be reduced in size when compared with a case where the reactors are composed of two four-leg six-phase iron core reactors.
A power conversion device, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Arrangements for reducing harmonics from AC input or output: using passive filters
Using semiconductor devices only: having a rectifier with controlled elements
Arrangements for reducing harmonics from AC input or output: suppression of common mode voltage or current
Apparatus for conversion between ac and ac, between ac and dc, or
About 2 years 6 months of term left · ends 19 Apr 2029 (estimated)
The present invention relates to a power conversion device, and in particular to a power conversion device including a Pulse Width Modulation (PWM) converter and a PWM inverter.
Conventionally, a power conversion device converting a three-phase alternating current (AC) voltage from a three-phase AC power source into a direct current (DC) voltage by a PWM converter, converting the DC voltage into a three-phase AC voltage by a PWM inverter, and supplying the three-phase AC voltage to a load circuit has been put to practical use. In the power conversion device, in order to prevent a voltage at a carrier frequency generated by switching transistors in the PWM converter from flowing into the three-phase AC power source, an AC input filter is provided between the three-phase AC power source and the PWM converter. The AC input filter includes three reactors and three capacitors.
In addition, in order to prevent a voltage at a carrier frequency generated by switching transistors in the PWM inverter from flowing into the load circuit, an AC output filter is provided between the PWM inverter and the load circuit. The AC output filter includes three reactors and three capacitors (for example, see Japanese Patent Laying-Open No. 9-294381 (Patent Document 1)).
FIG. 1 is a circuit block diagram showing a configuration of a power conversion device in accordance with one embodiment of the present invention.
FIG. 2 is a view showing a configuration of a six-leg six-phase iron core reactor used in the power conversion device shown in FIG. 1.
FIG. 3 is a view for explaining the effect of the embodiment.
1: AC input filter, 2 to 4, 11, 19 to 21, 62, 63: capacitor, 5 to 7, 16 to 18: reactor, 8: PWM converter, 9, 14: diode, 10, 13: transistor, 12: PWM inverter, 15: AC output filter, 22: three-phase AC power source, 23: load circuit, 30: six-leg six-phase iron core reactor, 31 to 36, 51 to 53: main leg, 37, 38: yoke, 41 to 46: wound wire, 50: three-leg three-phase iron core reactor, 54: four-leg three-phase iron core reactor, 55, 61: return path leg, 60: seven-leg six-phase iron core reactor, 65: DC power source, a1, b1, c1, a11, b11, c11: one terminal, a2, b2, c2, a22, b22, c22: the other terminal, T1 to T3: input terminal, T4 to T6: output terminal.
FIG. 1 is a circuit block diagram showing a configuration of a power conversion device in accordance with one embodiment of the present invention. In FIG. 1, the power conversion device includes input terminals T1 to T3, an AC input filter 1, a PWM converter 8, a capacitor 11, a PWM inverter 12, an AC output filter 15, and output terminals T4 to T6. Input terminals T1 to T3 receive a three-phase AC voltage from a three-phase AC power source 22.
AC input filter 1 includes capacitors 2 to 4 and reactors 5 to 7. Capacitors 2 to 4 have one electrodes connected to input terminals T1 to T3, respectively, and the other electrodes connected to each other. Reactors 5 to 7 have one terminals a1 to c1 connected to three input terminals of PWM converter 8, and the other terminals a2 to c2 connected to input terminals T1 to T3, respectively.