CN214591200U

CN214591200U - High-power electric precipitation high-frequency power supply

Info

Publication number: CN214591200U
Application number: CN202120849006.1U
Authority: CN
Inventors: 汤全国; 李亚杰
Original assignee: Hubei New Sky Electric Co ltd
Current assignee: Hubei New Sky Electric Co ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-11-02
Anticipated expiration: 2031-04-23

Abstract

The utility model provides a high-power electric precipitation high-frequency power supply, which belongs to the technical field of electric precipitation high-voltage power supplies and comprises a current-limiting reactor, a rectifying unit, two high-frequency inverter circuits and a high-frequency transformer, wherein the rectifying unit is electrically connected with the current-limiting reactor, the number of the high-frequency inverter circuits is two, the two high-frequency inverter circuits are electrically connected with the rectifying unit in parallel, the high-frequency inverter circuits respectively comprise two groups of IGBT half-bridge modules, the direct current sides of the two groups of IGBT half-bridge modules are electrically connected in parallel, the output sides of the two groups of IGBT half-bridge modules are electrically connected in parallel, and are electrically connected with a wiring end of the primary side of the high-frequency transformer, the high-power electric precipitation high-frequency power supply of the utility model electrically connects the output sides of the two groups of IGBT half-bridge modules of the two parallel high-frequency inverter circuits in parallel, and is electrically connected with the primary side of the single high-frequency transformer, thereby reducing the volume of the high-frequency transformer and reducing the cost, the number of high-voltage rectifier silicon stacks is reduced, and the reliability of the high-power electric dust removal high-frequency power supply is greatly improved.

Description

High-power electric precipitation high-frequency power supply

Technical Field

The utility model relates to an electric precipitation equipment's technical field, more specifically say so and relate to electric precipitation high voltage power supply's technical field.

Background

The high-power high-frequency power supply of electrostatic precipitator of prior art adopts LCC resonant circuit, because IGBT work is in high frequency contravariant state, and the consumption is big, often needs to select bigger specification IGBT switch components and parts and more powerful drive, causes IGBT and driven lectotype difficulty, often adopts two sets of inverter circuit and two sets of high frequency rectifier transformer's scheme at present, because highly compressed insulation requirement, causes the transformer size big, high-pressure rectification silicon piles is in large quantity, and the reliability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high-power electric precipitation high frequency power supply has solved prior art transformer size big, and high-pressure rectification silicon stack is in large quantity, the poor problem of reliability.

The technical scheme of the utility model is realized like this:

the utility model provides a high-power electric precipitation high frequency power supply, includes current-limiting reactor, rectifier unit, high frequency inverter circuit and high frequency transformer, the rectifier unit is connected with the current-limiting reactor electricity, high frequency inverter circuit's quantity is two, and two high frequency inverter circuit are connected with rectifier unit parallel connection electricity, and high frequency inverter circuit includes two sets of IGBT half-bridge module respectively, and the direct current side parallel connection electricity of two sets of IGBT half-bridge module is connected, and the output side parallel connection electricity of two sets of IGBT half-bridge module is connected to be connected with the wiring end electricity on the high frequency transformer primary side.

Furthermore, the IGBT half-bridge module is formed by electrically connecting two IGBT switch components in series.

Furthermore, the rectifying unit consists of six diodes, the six diodes are connected in series in pairs and then electrically connected in parallel, the number of the current-limiting reactors is three, and one end of each current-limiting reactor is electrically connected with the nodes of the diodes which are connected in series in pairs.

Further, a resonant capacitor and a resonant inductor are respectively connected in series between the terminal of the primary side of the high-frequency transformer and the output sides of the two groups of IGBT half-bridge modules.

And the filter capacitor is electrically connected with the diodes which are connected in series in pairs and the two high-frequency inverter circuits in parallel.

The utility model adopts the beneficial effect that above-mentioned technical solution can reach is:

1. the utility model discloses a high-power electric precipitation high frequency power supply is connected two parallelly connected high frequency inverter circuit's two sets of IGBT half-bridge module's of high-power parallelly connected output side electricity, is connected with single high frequency transformer's former limit electricity again to reduce high frequency transformer's volume, the cost is reduced has reduced the quantity of high-pressure rectification silicon heap, has improved this high-power electric precipitation high frequency power supply's reliability by a wide margin.

2. The utility model discloses the structure to the parallelly connected electricity of two sets of IGBT half-bridge module output side has adopted staggered drive control chronogenesis, and parallelly connected two sets of IGBT half-bridge module are not opened simultaneously, require very reducing to the uniformity of IGBT switch components and parts characteristic, have avoided the damage of IGBT switch components and parts furthest.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a circuit diagram of the present invention;

fig. 2 is a pulse width modulation diagram of the present invention.

In the drawings, the parts corresponding to the reference numerals are as follows:

the device comprises a current-limiting reactor 1, a rectifying unit 2, a high-frequency inverter circuit 3, a high-frequency transformer 4, an IGBT half-bridge module 5, an IGBT switch element 6, a diode 7, a resonant capacitor 8, a resonant inductor 9, a filter capacitor 10 and an electric dust collector 11.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a high-power electric precipitation high frequency power supply, including current-limiting reactor 1, rectifier unit 2, high frequency inverter circuit 3, high frequency transformer 4 and filter capacitor 10, rectifier unit 2 is connected with current-limiting reactor 1 electricity, high frequency inverter circuit 3's quantity is two, and two high frequency inverter circuit 3 are connected with rectifier unit 2 parallel connection, and high frequency inverter circuit 3 includes two sets of IGBT half-bridge module 5 respectively, and two sets of IGBT half-bridge module 5's direct current side parallel connection electricity is connected, and two sets of IGBT half-bridge module 5's output side parallel connection electricity is connected to be connected with the wiring end electricity of high frequency transformer 4 primary side. The specific structure of the IGBT half-bridge module 5 is as follows: the IGBT half-bridge module 5 is formed by electrically connecting two IGBT switch components 6 in series. And a resonant capacitor 8 and a resonant inductor 9 are respectively connected in series between the terminal of the primary side of the high-frequency transformer 4 and the output sides of the two groups of IGBT half-bridge modules 5. The specific structure of the rectifying unit 2 and the specific electrical connection relationship between the current-limiting reactor 1 and the rectifying unit 2 are as follows: the rectifying unit 2 is composed of six diodes 7, the six diodes 7 are connected in series in pairs and then electrically connected in parallel, the number of the current-limiting reactors 1 is three, and one end of each current-limiting reactor 1 is electrically connected with the nodes of the diodes 7 connected in series in pairs. The filter capacitor 10 is electrically connected in parallel with the diodes 7 and the two high-frequency inverter circuits 3 which are connected in series.

The utility model discloses a high-power electric precipitation high frequency power supply is when using, the wiring end with 4 vice limits of high frequency transformer is connected with the utmost point and the discharge electrode electricity of gathering dust of electrostatic precipitator 11, three-phase electric wire netting voltage is connected to rectifier unit 2 through current-limiting reactor 1, convert alternating current voltage into direct current voltage, high frequency inverter circuit 3 becomes high frequency alternating current voltage with direct current voltage reversal, and send to high frequency transformer 4 through resonance electric capacity 8 and resonance inductance 9, high frequency transformer 4 accomplishes last alternating current to direct current and changes, form direct current high voltage and send to 11 loads of electrostatic precipitator.

When the IGBT switch element 6 is turned off, the voltage of the primary side of the high-frequency transformer 4 is not zero, and the working magnetic density of the high-frequency transformer 4 is continuously changed, so that the problem of magnetic biasing of the high-frequency transformer 4 is solved; and because the output side of two sets of IGBT half-bridge module 5 connects the back in parallel, if the drive chronogenesis is identical, the electric current that passes through can not evenly distributed to parallelly connected two sets of IGBT half-bridge module 5 because of IGBT switch components and parts 6's characteristic difference, easily causes IGBT switch components and parts 6 to damage, consequently need control the switch chronogenesis of IGBT switch components and parts 6, so adopt following IGBT drive strategy: referring to fig. 1, IGBT switching element 6 is numbered with numbers V1 to V8, where IGBT switching element V1 and IGBT switching element V5 share 1 drive signal a, IGBT switching element V2 and IGBT switching element V6 share 1 drive signal B, IGBT switching element V3 and IGBT switching element V7 share 1 drive signal C, and IGBT switching element V4 and IGBT switching element V8 share 1 drive signal D and 4 drive signals.

Referring to fig. 2, the frequency and the pulse width of the driving signal A, B, C, D are the same, the phase of the driving signal B, C, D is delayed by 90 °, 180 °, and 270 ° with respect to the driving signal a, during operation, the pulse width Th is kept unchanged, and the output current of the load is adjusted by adjusting the magnitude of Ts.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a high-power electric precipitation high frequency power supply, includes current-limiting reactor (1), rectifier unit (2), high frequency inverter circuit (3) and high frequency transformer (4), rectifier unit (2) are connected with current-limiting reactor (1) electricity, the quantity of high frequency inverter circuit (3) is two, and two high frequency inverter circuit (3) are connected with rectifier unit (2) parallel electricity, and high frequency inverter circuit (3) include two sets of IGBT half-bridge module (5) respectively, and the direct current side parallel electricity of two sets of IGBT half-bridge module (5) is connected, its characterized in that, the output side parallel electricity of two sets of IGBT half-bridge module (5) is connected to be connected with the wiring end electricity on high frequency transformer (4) primary side.

2. The high-power electric precipitation high-frequency power supply as claimed in claim 1, wherein the IGBT half-bridge module (5) is formed by electrically connecting two IGBT switch components (6) in series.

3. The high-power electric precipitation high-frequency power supply as claimed in claim 1, wherein the rectifying unit (2) is composed of six diodes (7), the six diodes (7) are connected in series in pairs and then electrically connected in parallel, the number of the current-limiting reactors (1) is three, and one end of each current-limiting reactor (1) is electrically connected with a node of each diode (7) connected in series in pairs.

4. The high-power electric precipitation high-frequency power supply as claimed in claim 1, characterized in that a resonant capacitor (8) and a resonant inductor (9) are respectively connected in series between the terminal of the primary side of the high-frequency transformer (4) and the output sides of the two groups of IGBT half-bridge modules (5).

5. The high-power electric precipitation high-frequency power supply as claimed in claim 3, further comprising a filter capacitor (10), wherein the filter capacitor (10) is electrically connected in parallel with the diodes (7) and the two high-frequency inverter circuits (3) which are connected in series.