CN206149146U - A push -pull type isolation power for IGBT drive arrangement - Google Patents

Abstract

The utility model relates to a IGBT drive arrangement technical field discloses a push -pull type isolation power for IGBT drive arrangement, and this push -pull type is kept apart power and is passed through push pull transformer and rectification output circuit by self excitation push -pull circuit and link to each other and constitute, it is continuous with the electric capacity one end of series connection that rectification output circuit passes through rectifier diode by push pull transformer secondary winding one end, and the end of the same name of this secondary winding still presses the rectifier circuit of function continuous with the electric capacity other end of series connection through pincers, and the push pull transformer secondary winding other end is continuous with series capacitance's central tie point. The utility model discloses simplified isolated power supply circuit, realized control and kept apart the amplitude of power output negative pressure. The former vice distributed capacitance of transformer controls more easily simultaneously, has greatly improved drive arrangement's common mode rejection ability, drive arrangement's interference killing feature has been strengthened. Consequently, that the power is kept apart to a push -pull type highly reliable, low -cost, little volume,

Description

A kind of push-pull type insulating power supply for IGBT driving means

Technical field

The utility model is related to IGBT technical field of driving, more particularly to a kind of recommending for IGBT driving means Formula insulating power supply, it is adaptable to which compact, the IGBT of low cost drive occasion.

Background technology

In IGBT application systems, IGBT driving means have a major impact to volume, cost of whole system etc..Often at present In IGBT driving means, the secondary that configuration isolation driving power supply is drive circuit is typically needed（Drive circuit is exported to IGBT Interlock circuit part）Energy is provided.Conventional isolation drive power supply output has one positive one negative ground voltage altogether；Wherein negative pressure is general - 10V to -5V is taken, malleation typically takes 15V.Conventional isolation drive power supply is typically using FLYBACK or push-pull circuit.Wherein, Conventional FLYBACK circuit theory diagrams are as shown in Figure 1, 2.It is former that DC voltage Uin+, Uin- of input is added in FLYBACK circuits Side, transformer is conveyed to Jing after switching tube is modulated to high frequency square wave voltage, and transformer sends the energy of storage to secondary whole Stream filter circuit.Because of the negative altogether ground voltage of isolation drive power supply output one positive one, thus transformer secondary be typically designed as two around Transformer secondary winding Nf1, Nf2 in group, such as Fig. 1；A winding is also designed to, transformer secondary winding Nf1 in such as Fig. 2. Due to exporting positive and negative voltage magnitude and unequal in conventional drive circuit, two windings of secondary both can be designed as different circles Number, it is also possible to be designed as the identical number of turn, then processed by clamper shaping circuit.Conventional output voltage process circuit is such as Shown in Fig. 1,2 secondary circuits.Transformer secondary is different by the former vice-side winding number of turn using different windings in wherein Fig. 1, secondary The output voltage that amplitude is not waited is produced, the negative pressure for then exporting passes through voltage-stabiliser tube voltage stabilizing.Transformer secondary winding is simplified in Fig. 2 For a winding, then exported so as to produce two-way by voltage-stabiliser tube clamper by adopting capacitance partial pressure, negative pressure to output voltage Voltage.In less demanding occasion, both the above FLYBACK circuit voltage-stabiliser tube also can be cancelled.

Push-pull type insulating power supply primary circuit schematic diagram was as shown in figure 3, the drive circuit of two triodes both can be using special With IC, self-maintained circuit may also be employed.DC voltage Uin+, Uin- of input is added in push-pull circuit former limit, the complementary conductings of Jing Triode Q1, Q2 be modulated to high frequency square wave voltage and give transformer T1, transformer T1 vice-side windings are coupled out high-frequency bipolar Square wave exports DC voltage Jing after secondary current rectifying and wave filtering circuit.Push-pull type supply convertor secondary rectifying and wave-filtering output circuit is general Using bridge rectifier or full-wave rectification.As IGBT driving power supply occasions, secondary rectifying and wave-filtering output circuit common circuit As shown in Figure 4, Figure 5.Fig. 4 circuits by the way of bridge rectifier, push-pull transformer secondary two windings Nf1, Nf2, by two Individual rectifier bridge BD101, BD102 constitute bridge rectifier, then output it series connection, and the negative voltage of output passes through voltage-stabiliser tube ZD101 Clamper.Fig. 5 circuits adopt way of full-wave rectification, push-pull transformer secondary four windings Nf1, Nf2, Nf3, Nf4, two diodes Full-wave rectifying circuit is constituted, output adopts capacitance partial pressure, and drives pair so as to constitute IGBT to output voltage clamper with voltage-stabiliser tube Side circuit power supply.Voltage-stabiliser tube also can be cancelled in less demanding occasion, the rectification circuit of both the above push-pull circuit.

In use above in the insulating power supply scheme that IGBT drives, FLYBACK circuit because working methods determine its change Depressor magnetic core utilization rate is low, not advantageous at the aspect such as small size and low cost.Now have in conventional push-pull circuit scheme Component number is increased, what is had increased the complexity of Transformer Winding, so as to cause the relatively costly of driving means, volume It is larger.In addition, transformer secondary winding is complicated, design of transformer difficulty is not only increased, the volume and cost to transformer It is unfavorable, it is often more important that, vice-side winding is unfavorable for the distribution capacity control of transformer primary secondary after complicating, cause isolation drive The power supply anti-common mode disturbances ability of original secondary is reduced, so as to cause IGBT driving means reliability decreases, system exist it is unstable because Element.

The content of the invention

In consideration of it, the utility model provides a kind of push-pull type insulating power supply for IGBT driving means.

In order to realize foregoing invention purpose, the technical solution adopted in the utility model is：

A kind of push-pull type insulating power supply for IGBT driving means, the push-pull type insulating power supply is by self-excitation push-pull circuit It is connected with rectifying output circuit composition by push-pull transformer, the rectifying output circuit is led to by push-pull transformer auxiliary winding one end Over commutation diode is connected with electric capacity one end of series connection, and the Same Name of Ends of the auxiliary winding is also by the rectification circuit and string of pincers pressure function The electric capacity other end of connection is connected, and the push-pull transformer auxiliary winding other end is connected with the central connection point of series capacitance.

A kind of push-pull type insulating power supply for IGBT driving means, the rectification circuit of the pincers pressure function is by the pole of voltage stabilizing two Pipe, commutation diode, pincers voltage capacitance, the negative pole of the Zener diode is connected in series with the negative pole of commutation diode, and voltage stabilizing Diode two ends are parallel with electric capacity.

Because using technical scheme as above, the utility model has following superiority：

The former limit power conversion circuit of the utility model push-pull type insulating power supply employs self-oscillation push-pull circuit, simplifies Insulating power supply circuit, it helps reduces cost, reduces volume；Secondary rectifying and wave-filtering output circuit using diode rectification, The mode of capacitances in series partial pressure and voltage-stabiliser tube clamper is exported, the IGBT driving means push-pull type insulating power supplies of composition, is not only simplified Circuit, also easily realizes that control insulating power supply exports the amplitude of negative pressure.The secondary of push-pull converter adopts a winding, not only letter Change the structure of transformer, reduce volume of transformer, reduces cost, while the secondary distribution capacity of transformer primary is easily controlled, Greatly improve the common mode inhibition capacity of driving means；Enhance the antijamming capability of driving means.Therefore, it is that a kind of height can By, low cost, small size push-pull type insulating power supply.

Description of the drawings

Fig. 1 is output double winding FLYBACK insulating power supply converter circuit figures；

Fig. 2 is output simplex winding FLYBACK insulating power supply converter circuit figures；

Fig. 3 is push-pull type insulating power supply converter primary circuit figure；

Fig. 4 is that two-way exports altogether push-pull type insulating power supply secondary Double-bridge type rectification series circuit figure；

Fig. 5 is that two-way exports altogether push-pull type insulating power supply secondary full-wave rectifying circuit figure；

Fig. 6 is a kind of push-pull type insulating power supply circuit diagram for IGBT driving means；

Specific embodiment

The utility model is described in further detail below in conjunction with the accompanying drawings.

With reference to shown in accompanying drawing 6, a kind of push-pull type insulating power supply for IGBT driving means, the push-pull type insulating power supply It is connected with rectifying output circuit by push-pull transformer by self-excitation push-pull circuit and is constituted, the rectifying output circuit is by recommending transformation Device auxiliary winding one end is connected by commutation diode with electric capacity one end of series connection, and the Same Name of Ends of the auxiliary winding is also by pincers pressure function Rectification circuit be connected with the electric capacity other end of series connection, the central connection point of the push-pull transformer auxiliary winding other end and series capacitance It is connected.The rectified current routing zener of the pincers pressure function, commutation diode, pincers voltage capacitance, the Zener diode Negative pole is connected in series with the negative pole of commutation diode, and Zener diode two ends are parallel with electric capacity.

The utility model is used for the push-pull type insulating power supply former limit of IGBT driving means and adopts self-oscillation push-pull circuit, pushes away The secondary only one of which winding Nf1 of transformer is drawn, Same Name of Ends and the commutation diode D101 of transformer secondary winding contact, rectification The output connection output energy storage filter capacitor C102 of diode D101, the other end of electric capacity C102 is different with transformer secondary winding Name end is connected, and constitutes conventional rectifying and wave-filtering output circuit, and for isolation drive power supply positive direct-current voltages are provided；Recommend transformation simultaneously The Same Name of Ends of device vice-side winding is connected with a Zener diode ZD101, the negative electrode and commutation diode of Zener diode ZD101 D102 anti-series, the anode of commutation diode D102 is connected with output energy storage filter capacitor C103, the other end of electric capacity C103 and The different name end of transformer secondary winding is connected, and composition has the rectification circuit of certain pincers pressure function, provides negative for isolation drive power supply DC voltage, wherein Zener diode ZD101 two ends shunt capacitance C101.

Its brief operation principle is as follows：To simplify description, the conduction voltage drop of circuit breaker in middle device is not considered, recommend transformation Device is ideal transformer；When self-oscillation push-pull type IGBT isolation drive power input has certain voltage, electric current by R1, Nf1, Nf2 winding provides the condition of opening for triode Q1, Q2, when a triode is first turned on, it will in its connected former limit The direction induced voltage contrary with input voltage is produced on winding Np1 or Np2, so as on the winding for driving pin to be connected with it The voltage for being more conducive to conducting is produced, positive feedback is formed, the saturation conduction of the triode is realized, while in another triode It is upper to produce the voltage for accelerating its shut-off, realize that the triode is rapidly switched off.When the primary side winding being connected with turn-on transistor When Np1 or Np2 electric currents increase to certain value, transformer is presented saturated characteristic, causes electric current in the loop to increase rapidly, triode Saturation state is will move out, so as to cause coupled primary side winding voltage to reduce, is produced on the winding for driving pin to be connected with it Raw conducting voltage will be decreased, so as to cause the triode for turning on to be transformed into cut-off state by conducting state, while another Individual triode will be converted to opening state by cut-off state.In two triode alternate conductions of former limit, vice-side winding Ns1 two ends Ambipolar square-wave voltage will be induced.When Ns1 is positive voltage, secondary winding current by by the Same Name of Ends of vice-side winding Ns1, By the different name end of D101, C102 to vice-side winding Ns1, the energy storage of rectification, in C102, is that IGBT isolation drive power supplys are carried For positive direct-current voltages;When Ns1 is negative voltage, secondary winding current by by the different name end of vice-side winding Ns1, C103, D102, The Same Name of Ends of ZD101 and C101, vice-side winding Ns1, stores energy in C103, and for IGBT isolation drive power supplys negative direct current is provided Voltage.Due to IGBT isolation drives power supply, typically to export negative pressure more lower than malleation, therefore, by the voltage stabilizing value for adjusting ZD101 So as to the negative pressure of controlled output.At the upper electric initial stage, when negative pressure amplitude is not established with the voltage stabilizing value of voltage-stabiliser tube, electric current passes through ZD101 shunt capacitances C101 accelerates the foundation of negative pressure, contributes to the more reliable work of driving means.

These are only it is of the present utility model be preferable to carry out, implementation above mode is not limited to the utility model, All any modification, replacement, improvement within the utility model spirit and principle etc. should be included in the utility model protection model Within enclosing.

Claims (2)

1. a kind of push-pull type insulating power supply for IGBT driving means, is characterized in that：The push-pull type insulating power supply is by self-excitation Push-pull circuit is connected composition by push-pull transformer with rectifying output circuit, the rectifying output circuit by push-pull transformer pair around Group one end is connected by commutation diode with electric capacity one end of series connection, and the Same Name of Ends of the auxiliary winding is also by the rectification of pincers pressure function Circuit is connected with the electric capacity other end of series connection, and the push-pull transformer auxiliary winding other end is connected with the central connection point of series capacitance.

2. a kind of push-pull type insulating power supply for IGBT driving means according to claim 1, is characterized in that：The pincers The rectified current routing zener of pressure function, commutation diode, pincers voltage capacitance, negative pole and the rectification two of the Zener diode The negative pole of pole pipe is connected in series, and Zener diode two ends are parallel with electric capacity.