阅读说明：本技术 一种风电变流器的igbt驱动电路 (IGBT drive circuit of wind power converter ) 是由 吕怀明 蒋侃 于 2019-10-14 设计创作，主要内容包括：本发明公开了一种风电变流器的IGBT驱动电路,包括原边电路、隔离电路和副边电路,原边电路包括死区电路、互锁电路、保护电路、15V电源输入滤波电路和DC/DC电路,隔离电路包括变压器隔离电路和光耦隔离电路,副边电路包括±15V驱动电源、驱动电路和Vce-sat检测电路,本发明能够有效保护IGBT模块,并且该发明原边电路集成了死区电路、互锁电路和保护电路,可以提高抗干扰能力,提高驱动电路可靠性。(The invention discloses an IGBT (insulated gate bipolar transistor) driving circuit of a wind power converter, which comprises a primary circuit, an isolation circuit and a secondary circuit, wherein the primary circuit comprises a dead zone circuit, an interlocking circuit, a protection circuit, a 15V power supply input filter circuit and a DC/DC circuit, the isolation circuit comprises a transformer isolation circuit and an optocoupler isolation circuit, and the secondary circuit comprises a +/-15V driving power supply, a driving circuit and a Vce-sat detection circuit.)

1. An IGBT driving circuit of a wind power converter comprises a primary circuit, an isolation circuit and a secondary circuit, and is characterized in that the primary circuit comprises a dead zone circuit, an interlocking circuit, a protection circuit, a 15V power input filter circuit and a DC/DC circuit, the isolation circuit comprises a transformer isolation circuit and an optical coupling isolation circuit, the secondary circuit comprises a +/-15V driving power supply, a driving circuit and a Vce-sat detection circuit, the Vce-sat detection circuit is respectively connected with an IGBT module, the driving circuit and the optical coupling isolation circuit, the optical coupling isolation circuit is also connected with the dead zone circuit, the interlocking circuit and the protection circuit, the driving circuit is also respectively connected with the optical coupling isolation circuit and the IGBT module, when the Vce-sat detection circuit detects that the IGBT module has a short-circuit fault or an overcurrent fault, a fault signal is transmitted to the primary circuit through the optical coupling isolation circuit, the primary circuit simultaneously blocks driving signals of an upper tube and a lower tube of the IGBT module, and the IGBT module is turned off through the optical coupling isolation circuit and the driving circuit.

2. The IGBT driving circuit of the wind power converter according to claim 1, wherein the IGBT module is divided into an upper path and a lower path.

3. The IGBT driving circuit of the wind power converter according to claim 2, wherein the dead zone circuit, the interlock circuit and the protection circuit are divided into an upper path and a lower path.

4. The IGBT driving circuit of the wind power converter as claimed in claim 3, wherein the optical coupling isolation circuit is divided into an upper path and a lower path.

5. The IGBT driving circuit of the wind power converter as claimed in claim 4, wherein the driving circuit is divided into an upper path and a lower path.

6. The IGBT driving circuit of the wind power converter according to any one of claims 1 to 5, wherein the optical coupling isolation circuit comprises a feedback optical coupler and a driving optical coupler.

7. The IGBT driving circuit of the wind power converter as claimed in claim 1, wherein the transformer isolation circuit employs a high frequency isolation transformer, and the secondary side of the transformer isolation circuit has two independent windings to output two isolated power supplies.

Technical Field

The invention relates to the technical field of driving circuits, in particular to an IGBT driving circuit of a wind power converter.

Background

Wind-powered electricity generation converter system voltage 690V generally adopts 1700V's IGBT module, and high-power IGBT module switching speed is fast, produces very high di/dt and du/dt, brings the EMC electromagnetic interference problem, influences the reliable operation of converter, damages the IGBT module even, in order to improve the interference killing feature, has following two kinds of solutions:

1) the optical fiber is adopted to transmit the control signal, the weak signal of the control circuit is completely electrically isolated from the strong signal of the IGBT module, the anti-interference capability is strong, the reliability is high, but the cost of the optical fiber is high;

2) the special driver and the special driving chip are usually adopted, for example, the special driver for wind power 2SD300 is adopted, the special modulation and demodulation chips are adopted, the driving signal is transmitted through the pulse transformer, the anti-interference capability is strong, the reliability is high, and the method is widely applied to the field of wind power converters.

Although the problem of wind power converter EMC anti-interference has been solved to above two kinds of schemes, the cost is higher relatively, and comparatively economic solution adopts the opto-coupler to realize electrical isolation, but the former limit of opto-coupler generally adopts low-voltage circuit (15V or 5V), receives the interference easily.

In addition, high di/dt and du/dt are generated in the operation process of the high-power IGBT module, the upper and lower tube gates of the IGBT module are triggered by mistake, the upper and lower tubes of the IGBT module are directly communicated, short-circuit current is generated, the IGBT module is damaged if protection is not carried out in time, and the normal operation of the converter is seriously influenced.

Disclosure of Invention

The invention aims to provide an IGBT driving circuit of a wind power converter, and aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an IGBT driving circuit of a wind power converter comprises a primary side circuit, an isolation circuit and a secondary side circuit, wherein the primary side circuit comprises a dead zone circuit, an interlocking circuit, a protection circuit, a 15V power input filter circuit and a DC/DC circuit, the isolation circuit comprises a transformer isolation circuit and an optical coupling isolation circuit, the secondary side circuit comprises a +/-15V driving power supply, a driving circuit and a Vce-sat detection circuit, the Vce-sat detection circuit is respectively connected with an IGBT module, the driving circuit and the optical coupling isolation circuit, the optical coupling isolation circuit is also connected with the dead zone circuit, the interlocking circuit and the protection circuit, the driving circuit is also respectively connected with the optical coupling isolation circuit and the IGBT module, when the Vce-sat detection circuit detects that the IGBT module has a short-circuit fault or an overcurrent fault, the optical coupling isolation circuit transmits a fault signal to the primary side circuit, and the primary side circuit simultaneously blocks driving signals on and off a tube of, and the IGBT module is turned off through the optical coupling isolation circuit and the driving circuit.

As a further scheme of the invention: the IGBT module is divided into an upper path and a lower path.

As a further scheme of the invention: the dead zone circuit, the interlocking circuit and the protection circuit are equally divided into an upper path and a lower path.

As a further scheme of the invention: the optical coupling isolation circuit is divided into an upper path and a lower path.

As a further scheme of the invention: the driving circuit is divided into an upper path and a lower path.

As a further scheme of the invention: the optical coupling isolation circuit comprises a feedback optical coupler and a driving optical coupler.

As a further scheme of the invention: the transformer isolation circuit adopts a high-frequency isolation transformer, two independent windings are arranged on the secondary side of the transformer isolation circuit, and two isolated power supplies are output.

Compared with the prior art, the invention has the beneficial effects that: the IGBT module can be effectively protected, and the primary side circuit integrates the dead zone circuit, the interlocking circuit and the protection circuit, so that the anti-interference capability can be improved, and the reliability of the driving circuit can be improved.

Drawings

Fig. 1 is a schematic diagram of a driving circuit of a wind power converter according to the present invention.

Fig. 2 is a specific driving circuit of the wind power converter according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, example 1: in the embodiment of the invention, the IGBT driving circuit of the wind power converter comprises a primary side circuit, an isolation circuit and a secondary side circuit, wherein the primary side circuit comprises a dead zone circuit, an interlocking circuit, a protection circuit, a 15V power supply input filter circuit and a DC/DC circuit, the isolation circuit comprises a transformer isolation circuit and an optical coupling isolation circuit, and the secondary side circuit comprises a +/-15V driving power supply, a driving circuit and a Vce-sat detection circuit.

The primary side circuit comprises a dead zone circuit, an interlocking circuit and a protection circuit of the upper tube and the lower tube;

the dead zone circuit has the following functions: the upper and lower tube driving signals have a certain time interval Td, for example, after the upper tube driving signal is turned off, the lower tube driving signal can be turned on only after the Td is delayed;

the interlock circuit functions as: the upper and lower tube driving signals cannot be effective at the same time, so that the upper and lower tube driving through signals are prevented from being generated;

the protection circuit has the following functions: when the fault signal of the secondary side is yes, the protection circuit can simultaneously close the upper tube driving signal and the lower tube driving signal.

The function of the 15V power supply input filter circuit is as follows: the input 15V power supply is filtered, stability of the 15V power supply is maintained, and EMC interference is reduced.

The DC/DC circuit has the following functions: the 15V power supply is high frequency pulse width modulated DC/DC.

The isolation circuit includes: the drive optocoupler, the feedback optocoupler and the isolation transformer.

The function of the drive optocoupler is: and a primary side driving signal is transmitted to the secondary side circuit, and the primary side low-voltage side and the secondary side high-voltage side are electrically isolated.

The feedback optical coupler has the following functions: and transmitting a secondary side fault signal to the primary side circuit, and electrically isolating the primary side low-voltage side and the secondary side high-voltage side.

The isolation transformer has the following functions: the upper and lower output tubes drive the power supply and electrically isolate the primary side low-voltage side and the secondary side high-voltage side.

The secondary side circuit includes: the device comprises a +/-15V power supply, a driving circuit and a Vce-sat detection circuit.

The function of the +/-15V power supply is as follows: and outputting the driving power recommended by the IGBT module.

The drive circuit has the following functions: and amplifying the secondary side driving signal and outputting the push-pull signal.

The Vce-sat detection circuit has the following functions: and detecting a desaturation or overcurrent signal of the IGBT module, and feeding back a fault signal to the primary side.

The Vce-sat detection circuit is respectively connected with the IGBT module, the driving circuit and the optical coupling isolation circuit, the optical coupling isolation circuit is further connected with the dead zone circuit, the interlocking circuit and the protection circuit, the driving circuit is further respectively connected with the optical coupling isolation circuit and the IGBT module, when the Vce-sat detection circuit detects that the IGBT module has a short-circuit fault or an overcurrent fault, the optical coupling isolation circuit transmits a fault signal to the primary side circuit, the primary side circuit simultaneously blocks driving signals of the upper tube and the lower tube of the IGBT module, and the IGBT module is turned off through the optical coupling isolation circuit and the driving circuit.