CN205212726U - IGBT power - Google Patents

Abstract

The utility model provides an IGBT power supply, comprising: a transformer unit, the input terminal of the transformer unit is connected to an AC power supply, the output terminal of the transformer unit is connected to a power unit; the power unit, the power unit includes 6 anti-parallel diodes IGBT, the gate of each IGBT is connected to the controller, the sources of the first IGBT, the second IGBT and the third IGBT are respectively connected to the positive pole of the DC bus, and the drains of the fourth IGBT, the fifth IGBT and the sixth IGBT respectively connected to the negative pole of the DC bus, the drain of the first IGBT is connected to the source of the fourth IGBT, the drain of the second IGBT is connected to the source of the fifth IGBT, the drain of the third IGBT is connected to the source of the sixth IGBT pole connection. Whether the IGBT power supply according to the embodiment of the utility model works in the rectification state or the inversion state, the harmonic content of the power grid can be minimized and the power factor can be the highest.

Description

IGBT power supply

technical field

The utility model relates to a high power factor rectifying power supply, in particular to an IGBT (insulated gate bipolar transistor) power supply.

Background technique

The existing rectification/inversion power supply mode is to use 12-pulse rectification power supply for rectification, and use inverter resistance for inversion. The 12-pulse rectification method adopts the diode uncontrolled rectification method, and the excess electric energy is consumed through the resistance on the DC bus side during the inverter. The advantage of this method is high reliability.

The disadvantage of this method is that different devices are used for rectification and inverter, the inverter resistor is idle during rectification, and the 12-pulse rectifier power supply is idle during inverter, the equipment utilization efficiency is low, and the equipment cost is high; in addition, the harmonic current is large during rectification , current imbalance; inverter resistors are used to consume excess power and increase energy consumption during inversion; and in order to dissipate the heat generated by the resistors, it is necessary to increase a large number of air-conditioning cooling equipment, further increasing energy consumption and increasing costs.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the purpose of this utility model is to propose a kind of IGBT rectification and inverter power supply with high equipment utilization efficiency, simple circuit, high reliability, low manufacturing cost and low energy consumption.

The IGBT power supply according to the embodiment of the present invention includes: a transformer unit, the input terminal of the transformer unit is connected to an AC power supply, and the output terminal of the transformer unit is connected to a power unit; the power unit, the power The unit includes 6 IGBTs with anti-parallel diodes, the sources of the first IGBT, the second IGBT and the third IGBT are respectively connected to the positive pole of the DC bus, and the drains of the fourth IGBT, the fifth IGBT and the sixth IGBT are respectively connected to the positive pole of the DC bus. The negative pole of the DC bus is connected, the drain of the first IGBT is connected to the source of the fourth IGBT, the drain of the second IGBT is connected to the source of the fifth IGBT, and the third IGBT The drain of is connected to the source of the sixth IGBT.

According to the IGBT power supply of the embodiment of the utility model, by using the IGBT power unit instead of the traditional 12-pulse rectifier power supply, the IGBT power unit enters the rectification state when supplying power to the load, and the IGBT power unit enters the inverter state to feed back the current to the grid through the transformer unit . Through the parallel connection of multiple IGBT power supplies, the automatic current sharing of energy is realized. Moreover, the IGBT power supply according to the embodiment of the utility model adopts the IGBT power unit as the rectification module and the inverter module, so it has the characteristics of low current distortion rate, high efficiency and high reliability under both rectification and inverter conditions. Among them, the current distortion rate is lower than 5% at full load, and the rectification and inverter efficiency is higher than 92%. The IGBT power supply according to the embodiment of the utility model can minimize the harmonic content of the power grid and maximize the power factor no matter it is working in the rectification state or the inversion state. In addition, the IGBT power supply according to the embodiment of the utility model further has the advantages of simple circuit, low manufacturing cost and low energy consumption.

In addition, the IGBT power supply according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

The power unit further includes: a first capacitor, one end of the first capacitor is connected to the source of the first IGBT, and the other end of the first capacitor is connected to the drain of the fourth IGBT; Two capacitors, one end of the second capacitor is connected to the source of the second IGBT, the other end of the second capacitor is connected to the drain of the fifth IGBT; a third capacitor, the third capacitor One end is connected to the source of the third IGBT, and the other end of the third capacitor is connected to the drain of the sixth IGBT. That is to say, one end of the three capacitors is respectively connected to the positive pole of the DC bus, and the other ends of the three capacitors are respectively connected to the negative pole of the DC bus. The role of the three capacitors in the power unit is mainly to support the DC voltage, keep the DC voltage stable, and filter out the low-order harmonic current.

Wherein the transformation unit includes a transformer and a switch circuit, the high-voltage side winding of the transformer is connected to the AC power supply, and the low-voltage side winding of the transformer is connected to the power unit through the switch circuit. Transformers are used to convert the high voltage of the AC power supply to low voltage and serve as electrical isolation. The switch circuit is used to disconnect or connect power to the power unit.

Wherein the switch circuit includes: a first branch, the first branch includes a first switch, a first insurance and a first inductance connected in series, one end of the first switch is connected to the low-voltage side of the transformer, One end of the first inductance is connected to the drain of the first IGBT; a second branch, the second branch includes a second switch and a second inductance connected in series, one end of the second switch is connected to the The low-voltage side of the transformer is connected, and one end of the second inductance is connected to the drain of the second IGBT; the third branch, the third branch includes a third switch, a third insurance and a third An inductor, one end of the third switch is connected to the low-voltage side of the transformer, and one end of the third inductor is connected to the drain of the third IGBT.

Wherein the positive pole and the negative pole of the direct current bus are respectively connected to the positive pole and the negative pole of the load.

The gate of each of the IGBTs is respectively connected to an external controller for receiving a pulse signal generated by the external controller to trigger the IGBT.

Description of drawings

The above-mentioned and/or additional aspects and advantages of the utility model will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the functional block diagram of the IGBT power supply according to the utility model embodiment;

Fig. 2 is a schematic circuit diagram of an IGBT power supply according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The embodiment of the utility model provides an IGBT power supply. In the main circuit topology of the IGBT power supply, the IGBT power unit is used as both a rectification module and an inverter module by utilizing the property that the IGBT can work in both the rectification state and the inversion state. During rectification, the IGBT power unit enters the rectification state to rectify the load; during inversion, the IGBT power unit enters the inversion state to feed back the current to the grid; multiple IGBT power supplies are connected in parallel to realize automatic energy sharing.

Fig. 1 is a functional block diagram of an IGBT power supply according to an embodiment of the present invention. Fig. 2 is a schematic circuit diagram of an IGBT power supply according to an embodiment of the present invention. As shown in FIG. 1 , an IGBT power supply 1 according to an embodiment of the present invention includes: a transformer unit 100 and an IGBT power unit 200 .

Wherein, the input end 10 of the transformation unit 100 is connected to the AC power supply, and the output end 20 of the transformation unit 100 is connected to the IGBT power unit 200 . In this embodiment, the voltage transformation unit 100 may include a transformer 101 and a switch circuit 102 . The transformer 101 is used to convert the high voltage of the AC power supply to a low voltage and serve as electrical isolation. The switch circuit 102 is used to turn off or turn on the power supply of the power unit. For example, the transformer 101 may be a power frequency double-winding transformer. The high-voltage side winding of the transformer 101 is connected to the AC power supply, and the low-voltage side winding of the transformer 101 is connected to the IGBT power unit 200 through the switch circuit 102 .

As shown in FIG. 2 , the IGBT power unit 200 includes six IGBTs with antiparallel diodes. The gate of each IGBT is respectively connected to the external controller 20 for receiving a pulse signal generated by the external controller 20 to trigger the IGBT. The sources of the first IGBTG1, the second IGBTG2 and the third IGBTG3 are respectively connected to the positive pole 11 of the DC bus, the drains of the fourth IGBTG4, the fifth IGBTG5 and the sixth IGBTG6 are respectively connected to the negative pole 12 of the DC bus, and the first IGBTG1 The drain is connected to the source of the fourth IGBTG4, the drain of the second IGBTG2 is connected to the source of the fifth IGBTG5, and the drain of the third IGBTG3 is connected to the source of the sixth IGBTG6.

When the IGBT power supply 1 is in the rectification state, the IGBT power unit 200 is in the rectification state and rectifies the load 300 . When the IGBT power supply 1 is in the inverter state, the DC voltage at the output terminal of the transformer unit 100 rises, for example, to 600V-650V. At this time, the IGBT power unit 200 enters the inverter state, and the energy of the DC bus is returned to the grid through the transformer 101 .

In the embodiment of the present invention, as shown in FIG. 2 , the power unit 200 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. One end of the first capacitor C1 is connected to the source of the first IGBTG1, the other end of the first capacitor C1 is connected to the drain of the fourth IGBTG4; the second capacitor C2, one end of the second capacitor C2 is connected to the source of the second IGBTG2 , the other end of the second capacitor C2 is connected to the drain of the fifth IGBTG5; the third capacitor C3, one end of the third capacitor C3 is connected to the source of the third IGBTG3, and the other end of the third capacitor C3 is connected to the drain of the sixth IGBTG6 pole connection. That is to say, one end of the three capacitors C1 , C2 , C3 is respectively connected to the positive pole 11 of the DC bus, and the other ends of the three capacitors C1 , C2 , C3 are respectively connected to the negative pole 12 of the DC bus. The role of the three capacitors in the power unit is mainly to support the DC voltage, keep the DC voltage stable, and filter out the low-order harmonic current.

In the embodiment of the present invention, as shown in FIG. 2 , the switch circuit 102 includes a first branch a1 , a second branch a2 and a third branch a3 . The first branch a1 includes a first switch K1, a first fuse R1 and a first inductor L1 connected in series, one end of the first switch K1 is connected to the low-voltage side of the transformer 101, one end of the first inductor L1 is connected to the first IGBTG1 Drain connection; the second branch a2 includes a second switch K2 and a second inductance L2 connected in series, one end of the second switch K2 is connected to the low-voltage side of the transformer 101, and one end of the second inductance L2 is connected to the drain of the second IGBTG2 connection; the third branch a3 includes a third switch K3, a third insurance R3 and a third inductance L3 connected in series, one end of the third switch K3 is connected to the low-voltage side of the transformer 101, and one end of the third inductance L3 is connected to the third IGBTG3 drain connection.

In the embodiment of the present utility model, the positive pole 11 and the negative pole 12 of the DC bus are respectively connected to the positive pole and the negative pole of the load 300 to be charged and inverted, as shown in FIG. 1 .

According to the IGBT power supply of the embodiment of the utility model, by using the IGBT power unit instead of the traditional 12-pulse rectifier power supply or PWM power supply, the IGBT power unit enters the rectification state when the load is rectified, and the IGBT power unit enters the inverter state when the load is inverted. The state feeds energy back to the grid through the transformer unit. Through the parallel connection of multiple IGBT power supplies, the automatic current sharing of energy is realized. Moreover, the IGBT power supply according to the embodiment of the utility model adopts the IGBT power unit as the rectification module and the inverter module, so it has the characteristics of low current distortion rate, high efficiency and high reliability under both rectification and inverter conditions. Among them, the current distortion rate is lower than 5% at full load, and the efficiency is higher than 92%. The IGBT power supply according to the embodiment of the utility model can minimize the harmonic content of the power grid and maximize the power factor no matter it is working in the rectification state or the inversion state. In addition, the IGBT power supply according to the embodiment of the utility model further has the advantages of simple circuit, low manufacturing cost and low energy consumption.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (6)

1. A kind of IGBT power supply, is characterized in that, comprises: A transformer unit, the input terminal of the transformer unit is connected to the AC power supply, and the output terminal of the transformer unit is connected to the power unit; The power unit, the power unit includes 6 IGBTs with anti-parallel diodes, the sources of the first IGBT, the second IGBT and the third IGBT are respectively connected to the positive pole of the DC bus, and the fourth IGBT, the fifth IGBT and the first IGBT The drains of the six IGBTs are respectively connected to the negative poles of the DC bus, the drains of the first IGBT are connected to the source of the fourth IGBT, the drains of the second IGBT are connected to the source of the fifth IGBT The drain of the third IGBT is connected to the source of the sixth IGBT. 2. The IGBT power supply according to claim 1, wherein the power unit further comprises: a first capacitor, one end of the first capacitor is connected to the source of the first IGBT, and the other end of the first capacitor is connected to the drain of the fourth IGBT; a second capacitor, one end of the second capacitor is connected to the source of the second IGBT, and the other end of the second capacitor is connected to the drain of the fifth IGBT; A third capacitor, one end of the third capacitor is connected to the source of the third IGBT, and the other end of the third capacitor is connected to the drain of the sixth IGBT. 3. The IGBT power supply according to claim 1, wherein the transformation unit comprises a transformer and a switch circuit, the high-voltage side winding of the transformer is connected to the AC power supply, and the low-voltage side winding of the transformer passes through the The switch circuit is connected to the power unit. 4. The IGBT power supply according to claim 3, wherein the switching circuit comprises: The first branch, the first branch includes a first switch, a first insurance, and a first inductance connected in series, one end of the first switch is connected to the low-voltage side of the transformer, and one end of the first inductance connected to the drain of the first IGBT; The second branch, the second branch includes a second switch and a second inductor connected in series, one end of the second switch is connected to the low-voltage side of the transformer, one end of the second inductor is connected to the first Two IGBT drain connections; The third branch, the third branch includes a third switch, a third insurance, and a third inductance connected in series, one end of the third switch is connected to the low-voltage side of the transformer, and one end of the third inductance connected to the drain of the third IGBT. 5 . The IGBT power supply according to claim 3 , wherein the positive pole and the negative pole of the DC bus are respectively connected to the positive pole and the negative pole of the load to be charged and inverted. 6. The IGBT power supply according to any one of claims 1-5, wherein the gates of each of the IGBTs are respectively connected to an external controller for receiving a pulse signal generated by the external controller to trigger The IGBT.