Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Power conversion device

A power conversion device, voltage technology, applied in the direction of high-efficiency power electronic conversion, output power conversion device, electrical components, etc., to achieve the effect of extending the period, reducing vibration and extending life

Active Publication Date: 2016-05-04
DAIKIN IND LTD
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the output of the full-wave rectification circuit, there is a power pulsation having a frequency twice the frequency of the single-phase AC voltage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power conversion device
  • Power conversion device
  • Power conversion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] A. The structure of the direct type power conversion device:

[0054] figure 1 It is a block diagram showing the configuration of a direct power conversion device to which the control method described in this embodiment is applied. This direct power conversion device has a converter 3 , a power buffer circuit 4 , an inverter 5 and a DC link 7 .

[0055] Converter 3 is connected to single-phase AC power supply 1 via filter 2, for example. The filter 2 has a reactor L2 and a capacitor C2. Reactor L2 is provided between one of the two output ends of single-phase AC power supply 1 and converter 3 . The capacitor C2 is provided between the two output terminals of the single-phase AC power supply 1 . Filter 2 removes the higher harmonic components of the current. Filter 2 can also be omitted. For the sake of simplicity, the function of filter 2 will be ignored for description below.

[0056] The DC link 7 has DC power supply lines LH, LL.

[0057] The converter 3 is, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is a power conversion device that reduces the power capacity that is required of a power buffer circuit. A converter (3) performs full-wave rectification with respect to a single-phase voltage (Vin) and outputs a rectified voltage (Vrec) between direct current power supply lines (LL, LH). An inverter (5) receives the rectified voltage (Vrec) and supplies three-phase alternating current (Iu, Iv, Iw) to an inductive load (6). A power buffer circuit (4) is connected between the direct current power supply lines (LL, LH). The power buffer circuit (4) comprises a discharge circuit (4a) and a charging circuit (4b). The discharge circuit (4a) comprises a capacitor (C4) and a switch (Sc) connected in series. The charging circuit (4b) is configured, for example, from a step-up chopper and comprises a switch (Sl), a reactor (L4), and a diode (D40). One part of a power pulse that is input into the converter (3) is transferred between the direct current power supply lines (LL, LH) by the power buffer circuit (4).

Description

technical field [0001] The present invention relates to a power conversion device having a power buffer circuit. Background technique [0002] In order to obtain a DC voltage from a single-phase AC voltage input from a single-phase AC power supply, a full-wave rectification circuit is generally used. However, the output of the full-wave rectification circuit has a power ripple having a frequency twice the frequency of the single-phase AC voltage. Therefore, in order to reduce the power ripple, a power buffer circuit for buffering power is required between the output side of the full-wave rectifier circuit and the load. Buffering of power requires capacitive elements such as called smoothing capacitors. [0003] Non-Patent Document 1 discloses a technique in which a smoothing capacitor is connected to a snubber capacitor via a current reversible chopper to absorb ripple power. According to this technology, by reducing the electrostatic capacitance of the smoothing capacito...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/15H02M5/458
CPCH02M1/15H02M3/158H02M5/458H02M1/4225H02M7/48Y02B70/10H02M1/007H02M5/4585
Inventor 榊原宪一山下尚也
Owner DAIKIN IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com