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

Current-type DC-AC converter for driving low-input-voltage motor and soft switching control thereof

A low-input voltage, motor-driven technology, used in motor generator control, electronic commutation motor control, AC motor control, etc., can solve the problems of inability to step down, the output voltage is not high enough, and the output voltage range is limited. Application prospect, strong boost capability, small common mode current effect

Pending Publication Date: 2022-01-04
QINGDAO UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the current inverter circuit usually uses a voltage-type inverter circuit, the pre-stage boost circuit is essential, but the efficiency of the two-stage power conversion strategy is low, and the output voltage range is limited, resulting in a small range of motor speed regulation , performance is limited
[0004] In view of the shortcomings of the current two-stage DC-AC power conversion strategy, the current source inverter has been widely studied. The existing current source inverter is to connect a large inductor in series between the inverter bridge arm and the input DC power supply, and then The large inductance is equivalent to a current source, so that it exhibits the characteristics of a current source in the working process, realizes boost control, and can realize large output voltage and wide-range output voltage regulation, but the existing traditional current-source inverter cannot Step-down, or the situation that the output voltage is not high enough, needs further research and improvement

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
  • Current-type DC-AC converter for driving low-input-voltage motor and soft switching control thereof
  • Current-type DC-AC converter for driving low-input-voltage motor and soft switching control thereof
  • Current-type DC-AC converter for driving low-input-voltage motor and soft switching control thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The technical solution of the present invention will be described in further detail below through specific examples in conjunction with the accompanying drawings.

[0021] A current-mode DC-AC converter for low-input-voltage motor drive and its soft-switching control, its circuit structure is shown in figure 1 As shown, the converter is composed of an input power supply, a high-gain buck-boost chopper circuit with ZVS active clamp, an m-phase current-mode inverter circuit and an output filter circuit connected in sequence. When m is equal to 3, the m-phase current-type inverter circuit becomes a three-phase current-type inverter circuit, such as figure 2 As shown, in order to facilitate the description of the circuit principle, the numbering sequence of the switching tubes of the 3-phase current-type inverter circuit is changed, and the switching tubes of the upper bridge arm are in order of S 1 , S 3 , S 5 , the switching tubes of the lower bridge arm are S 4 , S ...

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

The invention discloses a current type DC-AC converter for driving a low-input-voltage motor. The current type DC-AC converter is formed by sequentially cascading a DC power supply, a high-gain buck-boost chopper circuit with a ZVS active clamp, an m-phase current type inverter circuit (m is a positive integer) and an output filter circuit. The DC power supply firstly passes through the high-gain buck-boost chopper circuit and then outputs high-frequency PWM current pulse waves, and then passes through the m-phase current type inverter circuit and the output filter circuit to obtain high-quality AC voltages. The high-gain buck-boost chopper circuit with the ZVS active clamp can work in a boost mode or a buck mode according to different output AC voltages, and an energy storage switch S can realize zero-voltage turn-on by controlling the turn-on time of an active clamp branch switch SC. The converter has the characteristics of single-stage boost inversion, high boost capability, wide output voltage regulation range, high conversion efficiency, high power density, small common-mode current and the like, and has a good application prospect in a low-input-voltage motor driving occasion.

Description

Technical field: [0001] The invention relates to a current-type DC-AC converter for driving a low input voltage motor, which belongs to the field of electric energy conversion. Background technique: [0002] With the development and progress of science and technology, new energy vehicles have begun to have a place in the traditional automobile industry. New energy vehicles not only integrate advanced vehicle control and power technology, but also have a new structure and are environmentally friendly. At present, new energy vehicles can be divided into three categories: pure electric vehicles, plug-in hybrid vehicles and fuel cell vehicles. The core components of electric vehicles include three major components: motor, electric drive and battery. Among them, the motor drive control system is the core part of pure electric vehicles, and an excellent DC-AC converter for motor drive is crucial to the performance of electric vehicles. [0003] At present, because there are man...

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
IPC IPC(8): H02M3/156H02M7/5387H02P21/14H02P27/08
CPCH02M3/156H02M7/53871H02P21/14H02P27/085Y02B70/10
Inventor 江加辉马大壮陈道炼
Owner QINGDAO UNIV
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