CN105375802A

CN105375802A - I-type NPC IGBT three-level circuit driving control method and circuit

Info

Publication number: CN105375802A
Application number: CN201510830986.XA
Authority: CN
Inventors: 徐关澄; 孟向军; 牛化鹏; 王林; 张海龙
Original assignee: State Grid Corp of China SGCC; XJ Electric Co Ltd; Xian XJ Power Electronics Technology Co Ltd
Current assignee: State Grid Corp of China SGCC; XJ Electric Co Ltd; Xian XJ Power Electronics Technology Co Ltd
Priority date: 2015-11-25
Filing date: 2015-11-25
Publication date: 2016-03-02

Abstract

The invention relates to an I-type NPC IGBT three-level circuit driving control method and circuit. The method comprises the steps that as for the internal tubes and the external tubes of one bridge arm, the internal tubes are connected before the external tubes are connected in connection; and the internal tubes are disconnected after the external tubes are disconnected in disconnection. The circuit is an RCD dead zone generation circuit. The circuit is simple and exquisite in design so that NPC IGBT I-type working reliability can be guaranteed. The I-type NPC IGBT three-level circuit driving control method and circuit are simple in structure and low in cost, and working performance, safety and reliability of the whole system can be enhanced.

Description

The drived control Method and circuits of I type NPC IGBT tri-level circuit

Technical field

The present invention relates to a kind of drived control Method and circuits of I type NPCIGBT tri-level circuit.

Background technology

When mention create a new basis for global energy supply time, the use of regenerative resource is one of them key issue.And wherein solar inverter is responsible for huge technical optimization potentiality.At present, photovoltaic system is responsible for the maximum potential improving solar panel and overal system design efficiency.

Compared with traditional two level topological structures being usually used in photovoltaic DC-to-AC converter, under same switch frequency, three level efficiency is better than two level, and along with switching frequency raising, switching loss reduces significantly, three level is at high switching frequency as can be seen here, high-powerly has a clear superiority in.

Three level in NPC topology (neutral point clamper) comprises the IGBT of the corresponding fly-wheel diode of band of 4 series connection, and for connecting 2 clamp diodes being separated DC link circuit.Two-level inverter has two State-output levels, and three-level inverter can have three states.The IGBT be different from two level design must switch whole DC tache voltage, in three level framework, and the upper DC tache voltage that only need switch half of IGBT.In three level, there is different change of current paths.Short change of current path is between clamp diode and the IGBT connecting DC link circuit, and long change of current path is then by IGBT and the clamp diode of three series connection.In order to accomplish this point, need short current path and symmetrical internal module layout.This produces low switch overvoltage and uses high DC tache voltage to realize the unique channel of the high efficiency factor.

Summary of the invention

The object of this invention is to provide the drived control Method and circuits of I type NPCIGBT tri-level circuit, realize reliable drived control in order to solve.

For achieving the above object, the solution of the present invention comprises:

The drived control method of I type NPCIGBT tri-level circuit, for the inner and outer tubes in a brachium pontis, when opening, interior pipe is prior to outer tube; During shutoff, interior pipe is later than outer tube.

During rising edge, interior pipe rising edge of a pulse is accelerated; During trailing edge, interior pipe driving pulse trailing edge is slack-off.

Comprise PWM drive circuit, PWM drive circuit output is provided with dead-zone generating circuit, and this dead-zone generating circuit is RCD circuit.

PWM drive singal passes through resistance R and the electric capacity C ground connection of series connection, diode D is in parallel with resistance R, diode D anode connects electric capacity C, an input of the connection of diode D anode or door, should or another input of door connect enable signal, should or the output of door be the output PWM1 of dead-zone generating circuit.This PWM1 signal removes 1 pipe, 2 pipes, 3 pipes, 4 pipes that drive IGBT.

Circuit design is simply exquisite, ensure that the reliability of NPCIGBTI font work.Structure of the present invention is simple, cost is low and can improve service behaviour, the safety and reliability of whole system.

Accompanying drawing explanation

Fig. 1 is I type NPCIGBT tri-level circuit schematic diagram (a pair brachium pontis);

Fig. 2 is dead-zone generating circuit schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, the present invention will be further described in detail.

Drived control embodiment of the method

I type NPCIGBT tri-level circuit as shown in Figure 1,1,4 pipes are outer tube, and 2,3 pipes are interior pipe.Traditional three level driver' s timing controls, and is the order up and down according to IGBT pipe, follows 1 pipe-2 and manages-3 pipe-4 pipes.If 3 pipes of NPC turn on and off the time and are all later than 4 pipes, after 4 pipes are first closed for turn off process, close 3 pipes, 4 pipes close after 3 pipe also non-cut-off current from output stream to N point, 4 pipe pressure-bearings are Udc/2.But open 3 pipes after first opening 4 pipe pipes when opening, brachium pontis no current path at present also do not opened by 3 pipes, makes output voltage be+Udc/2, and at this moment 4 pipes are opened, and 3 pipes still there will be pressure-bearing Udc.If 3 pipes are opened after first opening 4 pipes, rear voltage opened by 3 pipes is N, and 4 pipe pressure-bearings are Udc/2, and 4 pipes open after-current by output stream to negative pole, occurs without crossing compression.So need to make 3 pipes first open rear pass to 4 pipes, interior pipe just can be avoided to bear total head situation.Therefore, this system necessarily requires interior pipe (2 shown in figure, 3 pipes) first to open rear shutoff.Namely in, rear shutoff first opened by pipe, opens and first turn off after outward appearance.

From above-mentioned reason, Dead Time must be increased in circuit.Concrete circuit embodiments is as follows:

See Fig. 2, this figure is the schematic diagram that drive circuit (part) hardware increases Dead Time.This hardware dead-zone circuit is mainly dead band RCD circuit, is charged during rising edge by R to C, forms RC charge circuit, is discharged during trailing edge by D to C, forms CD discharge loop.Make 2,3 pipe driving pulse rising edges change fall time sooner and not, and the R in reducing in pipe driver' s timing Circuit tuning can realize, and make 2, and 3 pipe driving pulse trailing edges are slower, the C in increasing in pipe driver' s timing Circuit tuning.(interior pipe will be realized in RCD circuit and first open rear pass relative to outer tube, degree of precision device must be used).

Be presented above the concrete execution mode that the present invention relates to two themes, but the present invention is not limited to described execution mode.Under the thinking that the present invention provides; the mode easily expected to those skilled in the art is adopted to convert the technological means in above-described embodiment, replace, revise; and the effect played goal of the invention that is substantially identical with the relevant art means in the present invention, that realize is also substantially identical; the technical scheme of such formation is carried out fine setting to above-described embodiment and is formed, and this technical scheme still falls within the scope of protection of the present invention.

Claims

The drived control method of 1.I type NPCIGBT tri-level circuit, is characterized in that, for the inner and outer tubes in a brachium pontis, when opening, interior pipe is prior to outer tube; During shutoff, interior pipe is later than outer tube.
2. the drived control method of I type NPCIGBT tri-level circuit according to claim 1, is characterized in that, during rising edge, interior pipe rising edge of a pulse is accelerated; During trailing edge, interior pipe driving pulse trailing edge is slack-off.
The Drive and Control Circuit of 3.I type NPCIGBT tri-level circuit, is characterized in that, comprise PWM drive circuit, PWM drive circuit output is provided with dead-zone generating circuit, and this dead-zone generating circuit is RCD circuit.
4. the Drive and Control Circuit of I type NPCIGBT tri-level circuit according to claim 3, it is characterized in that, PWM drive singal passes through resistance R and the electric capacity C ground connection of series connection, diode D is in parallel with resistance R, diode D anode connects electric capacity C, diode D anode connects or an input of door, should or another input of door connect enable signal, should or the output of door be the output PWM1 of dead-zone generating circuit; This PWM1 signal for driving 1 of IGBT to manage, 2 pipe, 3 pipe, 4 pipe.