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AC conversion circuit

A technology for converting circuits and AC voltage, applied in the direction of converting AC power input into AC power output, AC power input into DC power output, electrical components, etc., can solve the problems of increased cost and low durability, and achieve high-efficiency electric power Transformation effect

Active Publication Date: 2013-10-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, a capacitor for rectification is required, which causes problems of increased cost and reduced durability

Method used

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Embodiment approach 1

[0081] First, the AC conversion circuit of the first embodiment will be described. Figure 1E is a block diagram showing a schematic configuration of the AC conversion circuit of the present embodiment. The AC conversion circuit of the present embodiment is configured to convert a single-phase input AC voltage of frequency f0 into a relatively low three-phase output AC voltage of frequency f1. The AC conversion circuit includes: a switch unit 101 that outputs an input AC voltage to each phase through a plurality of switching elements; a zero-cross timing detection unit 102 that detects the timing (zero-cross timing) when the value of the input AC voltage becomes 0; and controls each switch The switching control unit 103 for the operation of the element; and the filter 104 for removing the high-frequency component of the output voltage of the switching unit 101 . A load is connected after the filter 104, and an AC voltage of frequency f1 is supplied to the load. The frequency...

Embodiment approach 2

[0156] Next, the AC conversion circuit of the second embodiment will be described.

[0157] Figure 11 is a block diagram showing a schematic configuration of an AC conversion circuit in this embodiment. The AC conversion circuit of this embodiment differs from the AC conversion circuit of Embodiment 1 in that a converter unit 601 performing a rectification function is provided before the switch unit 602 to temporarily convert an input AC voltage into a DC voltage. Hereinafter, description will focus on differences from Embodiment 1, and descriptions of overlapping items will be omitted.

[0158]The AC conversion circuit of this embodiment includes: a converter unit 601 that converts an AC voltage into a DC voltage; a switch unit 602 that converts an input DC voltage to output to each phase; Timing zero-cross timing detection unit 102 ; switching control unit 603 for controlling the operation of each switching element; and filter 104 for removing high-frequency components of...

Embodiment approach 3

[0167] Next, the AC conversion circuit of the third embodiment will be described. This embodiment differs from the first and second embodiments described above in the configuration and operation of the switch control unit, but is the same in other constituent elements. Here, the second embodiment is taken as the basic configuration, and the operation of different parts will be mainly described, and the description of overlapping matters will be omitted.

[0168] Figure 17 It is a figure which shows the schematic structure of the switch control part of the AC conversion circuit in this embodiment. The switch control unit in this embodiment further includes a minimum on-time setting unit 1001 , a minimum off-time setting unit 1002 , a maximum on-time setting unit 1003 , and a maximum off-time setting unit 1004 .

[0169] The minimum on-time setting unit 1001 sends the minimum time during which each switching element is continuously in the on state to the switching signal outp...

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PUM

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Abstract

This AC conversion circuit converts a single-phase AC input voltage with a given frequency (f0) to a three-phase AC output voltage with a lower frequency (f1). This AC conversion circuit is provided with the following: a switching unit (101) that has a plurality of switching elements; and a switching control unit (103) that controls the conduction state of each switching element. The switching control unit (103) performs the conversion to a three-phase AC output voltage by inputting, to the switching unit (101), pulses that are pulse-density modulated on the basis of spatial vector modulation.

Description

technical field [0001] The present invention relates to techniques for converting a relatively high frequency alternating voltage into a relatively low frequency alternating voltage. Background technique [0002] In recent years, a power transmission method using magnetic resonance coupling has been proposed as a system for transmitting electric power in a non-contact manner. Patent Document 1 discloses a new wireless energy transmission device that transmits energy through space using an electromagnetic coupling phenomenon between two resonators. In this wireless energy transmission device, two resonators are coupled through the evanescent tail of the vibration energy at the resonance frequency generated in the surrounding space of the resonators, whereby vibration can be transmitted wirelessly (non-contact). energy. [0003] The output power of the resonator in this wireless power transmission system is alternating current at a frequency equal to the resonance frequency,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/293
CPCH02M5/458H02M5/297H02M7/4826
Inventor 山本浩司伊东淳一
Owner PANASONIC CORP
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