CN100367646C

CN100367646C - Single/three phase impedance source up/down voltage A/A converter

Info

Publication number: CN100367646C
Application number: CNB2004100665228A
Authority: CN
Inventors: 房绪鹏; 钱照明; 彭方正
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2004-09-17
Filing date: 2004-09-17
Publication date: 2008-02-06
Anticipated expiration: 2024-09-17
Also published as: CN1588776A

Abstract

The present invention relates to a single/three phase impedance source up/down voltage AC/AC converter which comprises two AC power electronic switches, an X-shaped unique resistance source network comprising an inductor and a capacitor, an AC voltage source and a load, wherein the two AC power electronic switches both comprise a rectification bridge comprising four to six diodes and a full control type power electronic device. A passive element of the X-shaped unique resistance source network periodically charges and discharges by the high-frequency switching work of the two AC power electronic switches to raise or lower an output voltage.

Description

List/three phase impedance source up/down voltage friendship/AC-AC converter

Technical field:

The present invention relates to a kind of friendship/AC-AC converter, but be specifically about friendship/AC-AC converter single-phase and three-phase PWM control step-less adjustment output voltage.

Background technology:

For the application scenario that only needs the regulation voltage amplitude, realize that volume is little, cost is low, the PWM AC/AC converter of no intermediate dc link is to select preferably.This AC converter can also realize functions such as power adjustments, electrical isolation, filtering except realizing the voltage-regulation.The novel performance that can improve AC/AC converter from the application of turn-offing power electronic device and PWM control technology significantly.

Shortcomings such as traditional AC/AC converter can be realized above-mentioned functions, but exists the voltage-regulation scope little, and common-mode conducting or common-mode are turn-offed and all can be damaged power electronic device during the switch alternate conduction, and the EMI problem of circuit is serious.

The purpose of this invention is to provide a kind of novel AC/AC converter based on source of resistance converter thought, this converter circuit is simple in structure, the voltage-regulation scope is big, and conducting of switch common-mode or common-mode are turn-offed all unlikely damage power electronic device, and it is few to exchange the input side current harmonics.

Summary of the invention:

For achieving the above object, the invention provides following scheme: press friendship/AC-AC converter for the single phase impedance source up/down, its circuit comprises two ac power electronic switches (S1) and (S2), network by the X type of two inductance (L1 and L2) and two capacitors (C1 and C2) formation, single phase alternating current (A.C.) voltage source and load, ac power electronic switch (S1) is parallel between source of resistance network and the load, ac power electronic switch (S2) is series between source of resistance network and the power supply, two ac power electronic switch (S1, S2) rectifier bridge and all-controlling power electronics device that constitutes by four diodes formed two ac power electronic switch (S1, S2) be operated in the HF switch state; Press friendship/AC-AC converter for three phase impedance source up/down, its circuit comprises two ac power electronic switches (S3) and (S4), one by three inductance (L1, L2 and L3) and six capacitors (network of the X-shaped of C1～C6) constitute, three-phase alternating current potential source and load, ac power electronic switch (S3) is parallel between source of resistance network and the load, ac power electronic switch (S4) is series between source of resistance network and the power supply, two ac power electronic switch (S3, S4) rectifier bridge and the all-controlling power electronics device that six diodes constitute of dividing field equally formed two ac power electronic switch (S3, S4) be operated in the HF switch state.

The output voltage of this converter is recently to control by the duty of regulating described ac power electronic switch (S1 or S2, S3 or S4), can be below or above input voltage.

This converter can be used for the control of the temperature as heating furnace, the brightness of electric light source, the rotating speed of asynchronous/synchronous AC motor, the bonding power of electric welding machine etc. and AC voltage regulator, alternating current steady voltage plug, the Power Conversion of wind power generation, military power supply, application scenario such as ac transmission (FACTs) system flexibly.

Impedance source up/down of the present invention presses friendship/AC-AC converter to comprise input filter, ac power electronic switch, source of resistance network, output filter, power supply and load.Through the HF switch work of two ac power electronic switches, the passive component of source of resistance network periodically discharges and recharges, and realizes the rising or the reduction of output voltage.

The present invention introduces unique source of resistance network, and circuit has extreme high reliability, and damages power electronic device can avoid conducting of two ac power electronic switch common-modes or common-mode to turn-off the time.Because the operating frequency of electronic power switch is far above power supply and output voltage frequency, the passive component value of source of resistance network is very little, and the volume of entire circuit, weight are all less, the efficient height.

Description of drawings:

Fig. 1 is the circuit structure diagram that impedance source up/down is pressed friendship/AC-AC converter;

Fig. 2 is the circuit structure diagram that the single phase impedance source up/down is pressed friendship/AC-AC converter;

Fig. 3 is the circuit structure diagram that three phase impedance source up/down is pressed friendship/friendship interchanger;

Fig. 4 is the drive signal sequential chart of ac power electronic switch S1 (S3), S2 (S4);

Fig. 5 is a kind of application example that three phase impedance source up/down is pressed friendship/AC-AC converter circuit.

Embodiment:

With reference to Fig. 1, impedance source up/down of the present invention presses friendship/friendship interchanger circuit to comprise ac power electronic switch, source of resistance network, voltage source and load.Circuit structure as shown in FIG..Certainly also has the I/O filter circuit.

Fig. 2 and Figure 3 shows that single-phase and three phase impedance source up/down presses friendship/AC-AC converter circuit.

Fig. 4 is the switching sequence figure of two ac power electronic switches, and the two all is operated in the HF switch state.By the duty ratio of by-pass cock conducting, can regulate the output voltage size.

Fig. 5 is that three phase impedance source up/down presses friendship/AC-AC converter circuit application in motor-driven practical circuit, can realize the adjusting of motor speed by this circuit.

Claims

1. impedance source up/down voltage friendship/AC-AC converter, comprise single phase impedance source up/down voltage friendship/AC-AC converter and three phase impedance source up/down voltage friendship/AC-AC converter, it is characterized in that: the circuit of described single phase impedance source up/down voltage friendship/AC-AC converter comprises two ac power electronic switch S1 and S2, a lattice network that constitutes by two inductance (L1 and L2) and two capacitors (C1 and C2), single phase alternating current (A.C.) voltage source and load, ac power electronic switch S1 is parallel between lattice network and the load, ac power electronic switch S2 is series between lattice network and the power supply, two ac power electronic switch S1 and S2 form by rectifier bridge and an all-controlling power electronics device that four diodes constitute, and two ac power electronic switch S1 and S2 are operated in the HF switch state; The circuit of described three phase impedance source up/down voltage friendship/AC-AC converter comprises two ac power electronic switch S3 and S4, one by three inductance and six X-networks that capacitor constitutes, three-phase alternating current potential source and load, ac power electronic switch S3 is parallel between lattice network and the load, ac power electronic switch S4 is series between lattice network and the power supply, two ac power electronic switch S3 and S4 form by rectifier bridge and an all-controlling power electronics device that six diodes constitute, and two ac power electronic switch S3 and S4 are operated in the HF switch state.

2. impedance source up/down voltage friendship/AC-AC converter according to claim 1 is characterized in that: the output voltage of this converter is by regulating described ac power electronic switch S1 or S2, and the duty of S3 or S4 is recently controlled, and is below or above input voltage.

3. impedance source up/down voltage friendship/AC-AC converter according to claim 1 is characterized in that: this converter applications is in the control of the bonding power of the rotating speed of the temperature of heating furnace, the brightness of electric light source, asynchronous/synchronous AC motor, electric welding machine and AC voltage regulator, alternating current steady voltage plug, the Power Conversion of wind power generation, military power supply, flexible ac transmission system.