CN2901688Y

CN2901688Y - Contravariant circuit of current source

Info

Publication number: CN2901688Y
Application number: CN 200620084696
Authority: CN
Inventors: 李瑞来; 胡顺全; 方汉学
Original assignee: Shandong Xinfeng Photoelectric Science & Technology Development Co Ltd
Current assignee: Shandong Xinfengguang Electronic Technology Development Co., Ltd.
Priority date: 2006-05-25
Filing date: 2006-05-25
Publication date: 2007-05-16
Anticipated expiration: 2016-05-25

Abstract

The utility model relates to a voltage model current supply DC-AC circuit, which belongs to electronic inverter technique territory. The utility model comprises n power units, n even current inductances and load, wherein every power unit comprises a bridge arm and a filtered wave absorbing circuit (n>=2), the bridge arm and the filtered wave absorbing circuit are parallel connected in positive blusher and negative blusher of DC power supply with half-way line, the half-way line is in series connected with middle point of the filtered wave circuit and at the same time connected with middle point of clamping diode in series connected with the bridge arm, one end of the even current inductance is connected with middle point of the bridge arm power apparatus. The utility model is simple in structure, stable in performance and easy for control.

Description

A kind of inverter circuit of current source

(1) technical field under

The utility model relates to the inverter circuit of the current source of voltage-type, belongs to the technical field of electronic converter.

(2) background technology

The current source of voltage-type adopts H bridge circuit topology to add electric current closed loop formation more at present, simple with regard to single such circuit topological structure, be easy to control, but when the big electric current of needs, need the parallel connection of a plurality of H bridge current source, to handle current-sharing and circulation problem after the parallel connection, so just can not simply add the electric current closed loop and constitute, unless the current closed-loop that is multiplied again could effectively be handled current-sharing and circulation problem with H bridge topology.

(3) summary of the invention

The utility model provides a kind of inverter circuit of current source in order to overcome the deficiency of above technology, have simple in structure, stable performance, the characteristics that are easy to control.

The utility model is realized by following measure:

The inverter circuit of current source of the present utility model is made up of n power cell, a n current sharing inductor and load, and each power cell absorbs circuit by a brachium pontis and a filtering and forms n 〉=2;

Each brachium pontis, filtering absorb circuit and current sharing inductor is formed an element circuit, the annexation of each element circuit is: brachium pontis and filtering absorb circuit and are connected in parallel in the middle of the DC power supply positive bus-bar and negative busbar that has center line, and the mid point of the catching diode of connecting in center line and the mid point series connection that absorbs filter circuit, while and the brachium pontis is connected; One of current sharing inductor terminates at the mid point of the power device of brachium pontis;

The positive bus-bar of each power cell is connected in parallel, and center line is connected in parallel, and negative busbar is connected in parallel, and the output of each current sharing inductor is connected in parallel and is connected with load, and the other end of load is connected with center line after the parallel connection.

The inverter circuit of current source of the present utility model, described filtering absorb circuit and are made up of the filtering absorption electric capacity of two series connection.

The inverter circuit of current source of the present utility model, described brachium pontis are single brachium pontis, doube bridge arm or many bridge arm circuit.Described brachium pontis is three level, five level or multi-level circuit.

The inverter circuit of current source of the present utility model, have simple in structure, stable performance, the characteristics that are easy to control.

(4) description of drawings

Accompanying drawing is inverter circuit figure of the present utility model

Among the figure: 1-power cell 2-filtering absorbs circuit 3-brachium pontis 4-load D1, D2-diode ug1, ug2, ug3, ug4-switching device C1 ... Cn-filtering absorbs electric capacity L1 ... the Ln-current sharing inductor.

(5) embodiment

Below in conjunction with the drawings and specific embodiments the utility model is made specific description.

Accompanying drawing is a kind of topological circuit of current source inverter circuit, and by being made up of n power cell 1, a n current sharing inductor L and load 4, each power cell 1 absorbs circuit 2 by a brachium pontis 3 and a filtering and forms.The filtering here absorbs circuit 2 and is made up of the filtering absorption electric capacity of two series connection.The brachium pontis 3 here is single bridge arm tri-level circuit, is made up of four switching device ug1, ug2, ug3, ug4 and two catching diode D1, D2 of connecting.Single brachium pontis also can be doube bridge arm, many brachium pontis, and three level here can be five level, many level.The current source inverter circuit of present embodiment is an example with the tri-level single brachium pontis, and positive bus-bar and neutral point are that neutral point and negative busbar are by another independently rectifier bridge power supply by an independent rectifier bridge power supply.

Each element circuit absorbs circuit 2 by a brachium pontis 3, filtering and a current sharing inductor L forms, the circuit connecting relation of each element circuit is: brachium pontis 3 and filtering absorb circuit 2 and are connected in parallel in the middle of the DC power supply positive bus-bar M and negative busbar N that has center line O, center line O connect with the mid point that absorbs filter circuit 2, is connected with the mid point of the catching diode of connecting in the brachium pontis 3 simultaneously; One of current sharing inductor L terminates at the mid point of the power device of brachium pontis 3.

Three-phase input M, the O of each element circuit, M, O in the middle of the N are by one group of independently rectifier bridge power supply, O, N are by one group of independently rectifier bridge power supply, O is exactly the center line of the new circuit of forming, two filtering in parallel absorb the filtering that capacitances in series forms and absorb circuit 2 between positive bus-bar M, negative busbar N, and DC circuit is played the absorption filter action.The mid point that the filtering of two series connection absorbs electric capacity is connected on the center line, the brachium pontis 3 of one group of single bridge arm tri-level in parallel between the positive and negative bus after filtering absorbs circuit 2, the end of current sharing inductor L1 is connected on the tie point of ug2 and ug3, the other end of current sharing inductor L1 is in parallel with the other end of the current sharing inductor of the 2nd unit and n unit, current sharing inductor L helps reducing inverter circulation in parallel, also helps the stability of Current Negative Three-Point Capacitance system simultaneously.Power cell 1 such circuit has several, all in parallel mutually between them, be that each unit positive bus-bar M is connected in parallel, the center line O of each unit is connected in parallel, each unit negative busbar N is connected in parallel, inductance L 1 ... Ln is connected in parallel and connects with load 4, and the other end of load 4 is connected on the center line O.This by single bridge arm tri-level circuit several, filtering absorb circuit several, current sharing inductor several, the circuit that load is formed is exactly the topological circuit of a kind of specific current source inverter circuit.

This DC power supply of being made up of positive and negative busbar and center line is given a single leg inverter power supply, the impressed current negative feedback, just form a single bridge arm voltage source inventer, a plurality of single bridge arm voltage source inventers adopt the phase-shifting carrier wave modulation, reduce the harmonic wave of total output current.Such circuit mechanism is simple, and stable performance is easy to control.

Claims

1, a kind of inverter circuit of current source is characterized in that:

Be made up of n power cell (1), a n current sharing inductor (L) and load (4), each power cell (1) absorbs circuit (2) by a brachium pontis (3) and a filtering and forms n 〉=2;

Each brachium pontis (3), filtering absorb circuit (2) and current sharing inductor (L) is formed an element circuit, the annexation of each element circuit is: brachium pontis (3) and filtering absorb circuit (2) and are connected in parallel in the middle of the DC power supply positive bus-bar (M) and negative busbar (N) that has center line (O), center line (O) is connected with the mid point that absorbs filter circuit (2), and the mid point with the middle catching diode of connecting of brachium pontis (3) is connected simultaneously; One of current sharing inductor (L) terminates at the mid point of the power device of brachium pontis (3);

The positive bus-bar of each power cell (1) is connected in parallel, and center line is connected in parallel, and negative busbar is connected in parallel, and the output of each current sharing inductor (L) is connected in parallel and is connected with load (4), and the other end of load (4) is connected with the center line after the parallel connection.

2, according to the inverter circuit of the described current source of claim 1, it is characterized in that: described filtering absorbs circuit (2) and is made up of the filtering absorption electric capacity of two series connection.

3, according to the inverter circuit of the described current source of claim 1, it is characterized in that: described brachium pontis (3) is single brachium pontis, doube bridge arm or many bridge arm circuit.

4, according to the inverter circuit of the described current source of claim 1, it is characterized in that: described brachium pontis (3) is three level, five level or multi-level circuit.