CN2919679Y

CN2919679Y - Mulriple rectifier equipment consisting of twelve commutating pulses

Info

Publication number: CN2919679Y
Application number: CN 200620083112
Authority: CN
Inventors: 李瑞来; 尹彭飞
Original assignee: Shandong Xinfeng Photoelectric Science & Technology Development Co Ltd
Current assignee: Shandong Xinfeng Photoelectric Science & Technology Development Co Ltd
Priority date: 2006-04-17
Filing date: 2006-04-17
Publication date: 2007-07-04
Anticipated expiration: 2016-04-17

Abstract

The utility model relates to a multiple rectifying device comprising 12 pulsed rectifiers, and pertains to a power supply device for a multi-level inverter. The utility model is composed of at least two parallel tri-phase AC transformers. The multiple rectifying device is characterized in that each transformer has the same windings, i.e. the symmetric delta connection system and the star-connection system; the phase shift is conducted between the primary levels of the transformers. The transformer structure can solve a plurality of shortcomings of the traditional transformer. Because the secondary winding methods of various transformers are the same, the utility model has the advantages of a batch production, a reduced technique cost and a total cost.

Description

A kind of multiple rectifying device of forming by 12 impulse commutations

(1) technical field under

The utility model relates to a kind of multiple rectifying device of being made up of 12 impulse commutations, belongs to a kind of power supply device of multi-electrical level inverter.

(2) background technology

Traditional power transformer only has transmission and isolates the function of electric energy, when jumbo interchange is varied to direct current, general employing controlled rectification and uncontrollable rectification, during controlled rectification, the control technology complexity, difficulty is big, during with uncontrollable rectification, to producing very big harmonic wave on the electrical network, in the inverter of many level, need to organize independently DC power supply sometimes more, because the problem of many group independent DC power supplies, if when adopting controlled rectification, control is complicated, and each DC power supply need be joined a cover control circuit substantially, make control complicated, volume is big, and quantity is many, and reliability reduces.

For the many groups direct current in traditional multi-electrical level inverter circuit is by adopting isolating transformer to power to multi-group power, but transformer generally all adopts the way coiling of secondary winding phase shift, like this, each phase shift winding is again after the rectification, it is just less at the corresponding harmonic wave that produces in the former limit of transformer, reach the multiple rectifying purpose, but following shortcoming is arranged on this method, (1) transformer secondary winding construction complexity, the coiling cost increases (2) because the phase shift winding is many, and is when corresponding error just increases (3) for larger capacity, also bigger with volume and weight, the iron core of transformer is also bigger, is a problem for transportation.

(3) summary of the invention

The utility model is in order to overcome the deficiency of above technology, a kind of multiple rectifying device of being made up of 12 impulse commutations is provided, the transformer of this device has that coiling is simple, the phase shift winding is few, volume and weight is little, can produce in batches, and has the good advantage of rectification effect.

The utility model relates to a kind of multiple rectifying device of being made up of 12 impulse commutations, be by three-phase alternating current, at least two transformers parallel with one another, its special feature is: the secondary winding of each transformer is identical, for the corner connection and the star of symmetry connects winding, carry out phase shift between the primary.

Multiple rectifying device of the present utility model, when described transformer is N, phase shift between the primary [60/ (2 * N)] °.When the transformer of stating is 3,10 ° of the phase shifts successively of 3 transformers.When described transformer was 2, phase shift was 15 ° between 2 transformers.

Concrete connected mode of the present utility model is: ac grid voltage flows to transformer, the connected mode of transformer is: with the primary phase shift, a plurality of then primary parallel connections, and the secondary of each transformer is identical, the secondary of each transformer is that the star of symmetry connects and the corner connection winding, primary can be that corner connection or star connect winding, just the winding winding of each transformer secondary is identical, as long as elementaryly just can make secondary 4 the phase shift groups that reach by two phase shifts, during 3 transformers connected in parallel, as long as elementary phase shift just can make secondary 6 the phase shift groups that reach for 15 °, this method can two primary parallel connections, also can a plurality of primary in parallel arbitrarily, produce many group phase shift power supplys, the primary winding is that corner connection winding and star connect winding with the also available corner connection method of wye connection, each transformer secondary, the corner connection winding can be many groups, and it also can be many groups that star connects winding.

The structure of this transformer just can solve numerous shortcomings of traditional transformer, because each transformer secondary winding winding is identical, can realize producing in batches, and this sampling technology cost will reduce, and has reduced cost simultaneously.

(4) description of drawings

Fig. 1 is the circuit structure diagram of the present utility model that includes three transformers.

Fig. 2 is the circuit structure diagram of the present utility model that includes two transformers.

Among the figure, 1-alternating current 2-transformer 3-rectifier.

(5) embodiment

Below in conjunction with the drawings and specific embodiments the present invention is made specific description.

Shown in the accompanying drawing 1, three transformers connected in parallel phase shift 2 secondary circuit structure charts, as shown in the figure: three identical transformers connected in parallel of secondary are arranged, the elementary of three transformers equally all is wye connection, two second phases have just been moved, second transformer relatively first transformer phase shift 10 °, the 3rd transformer with respect to second transformer phase shift 10 °, such three transformers connected in parallel have just obtained secondary 6 phase shift groups.Six phase shift groups are carried out the AC-DC conversion through rectifier 3, becoming direct current after the AC rectification, for the inverter of many level provides many group independent DC power supplies, control complexity, the volume that the structure of this transformer just can solve traditional transformer is big, quantity is many, overweight, shortcomings such as reliability reduction because each transformer secondary winding winding is identical, can realize producing in batches, this sampling technology cost will reduce, and has reduced cost simultaneously.

Shown in the accompanying drawing 2,15 ° of circuit structure diagrams of two transformers connected in parallel phase shifts, as shown in the figure: two identical transformers connected in parallel of secondary are arranged, the elementary of two transformers equally all is wye connection, secondary all is the wye connection and the delta connection of symmetry, just moved a second phase, second transformer is 15 ° with respect to first transformer phase shifting angle, and such two transformers connected in parallel have just obtained 4 phase shift groups.Four phase shift groups are carried out the AC-DC conversion through rectifier 3, becoming direct current after the AC rectification, for the inverter of many level provides enough many groups independent DC power supplies, control complexity, the volume that the structure of this transformer just can solve traditional transformer is big, quantity is many, overweight, thereby reduced shortcomings such as reliability,, can realize producing in batches because each transformer secondary winding winding is identical, this sampling technology cost will reduce, and has reduced cost simultaneously.

Above-mentioned each primary also can be identical corner connection winding.

Each transformer secondary is that corner connection winding and star connect winding, and the corner connection winding can be many groups, and it also can be many groups that star connects winding, and each transformer has (Y/y.d D/y.d) method.

Claims

1. multiple rectifying device of forming by 12 impulse commutations, be to be composed in series successively by alternating current (1), at least two transformers (2) parallel with one another, several rectifiers (3) parallel with one another, it is characterized in that: the secondary winding of each transformer (2) is identical, for the corner connection and the star of symmetry connects winding, carry out phase shift between the primary.

2. multiple rectifying device according to claim 1 is characterized in that: when described transformer is N, and phase shift between the primary

3. multiple rectifying device according to claim 1 is characterized in that: described transformer is 3,10 ° of the phase shifts successively of 3 transformers.

4. multiple rectifying device according to claim 1 is characterized in that: described transformer is 2, and phase shift is 15 ° between 2 transformers.