RC absorption circuit at high-frequency high-power transformer end

Abstract

According to the RC absorption circuit at the high-frequency and high-power transformer end, modular design is adopted, the resistor, the capacitor, the radiator and the like are designed into compact assemblies, the size is small, installation and maintenance are convenient, batch production can be achieved, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-frequency induction heating power supply, and specifically to an RC absorption circuit at the end of a high-frequency high-power transformer, which is commonly used in an ultra-high frequency parasitic oscillation absorption circuit at the primary side of a high-frequency high-power induction heating power supply isolation transformer, wherein R is an absorption resistor and C is an absorption capacitor. Background Art

[0002] When a high-frequency, high-power transformer is in operation, there is parasitic capacitance between the primary and secondary sides of the transformer, and there are parasitic inductance and parasitic capacitance between the connecting cable from the primary side of the transformer to the high-frequency inverter bridge. When the system operates at a frequency of several hundred kilohertz, high-frequency parasitic oscillations will be generated between the parasitic inductance and parasitic capacitance inside the transformer and the connecting cable, resulting in parasitic oscillation currents of several megahertz to more than ten megahertz and high spike voltages in the system. This high-frequency parasitic oscillation current will flow through the inverter power tube, causing the inverter power tube to lose a lot, or even burn out due to overcurrent and overtemperature, which in turn leads to low stability and reliability of the equipment. Utility Model Content

[0003] The purpose of the utility model is to be directly connected in parallel to the primary input end of a high-frequency high-power transformer, to suppress high-frequency parasitic oscillations in the system, to prevent overcurrent and overtemperature of the inverter power tube, and to greatly improve the reliability and stability of the high-power high-frequency power supply.

[0004] The technical solution of the utility model is to provide a high-frequency high-power transformer end RC absorption circuit, which is characterized by comprising a non-inductive absorption capacitor component and a non-inductive absorption resistor component;

[0005] The non-inductive absorption capacitor components include:

[0006] A plurality of non-inductive absorption capacitors are connected in series in sequence through a plurality of top capacitors connected transversely in series with copper bars, a capacitor connected longitudinally with a copper bar, and a plurality of bottom capacitors connected transversely with copper bars, and the non-inductive absorption capacitor at one end is electrically connected to the copper bar connected to the outside of the first absorption capacitor group;

[0007] The non-inductive absorption resistor components include:

[0008] Several non-inductive absorption resistors among the plurality of parallel non-inductive absorption resistors are respectively connected in parallel through the first resistor group connecting copper bar, the second resistor group connecting copper bar, the third resistor group connecting copper bar, and the second non-inductive absorption resistor externally connected copper bar, and then connected in series through the second non-inductive absorption resistor externally connected copper bar to form a whole;

[0009] The first absorption capacitor group is externally connected to the copper bar and the first non-inductive absorption resistor is externally connected to the copper bar, the second absorption capacitor group is externally connected to the copper bar and one pole of the primary winding of the high-frequency high-power transformer, and the second non-inductive absorption resistor is externally connected to the copper bar and the other pole of the primary winding of the high-frequency high-power transformer.

[0010] Preferably, the non-inductive absorption capacitor is a plurality of capacitors connected in series.

[0011] Preferably, a radiator is further included, the radiator comprising: a water-cooled radiator plate, a water-cooled copper pipe, a first water joint and a second water joint;

[0012] One side of the water-cooled radiator plate is connected to the non-inductive absorption resistor, and the other side is welded to the water-cooled copper tube, and the first water joint and the second water joint are welded to both ends of the water-cooled copper tube respectively;

[0013] The first water connector and the second water connector are used for the inlet and outlet of cooling water.

[0014] Preferably, it also includes an insulating plate, which is arranged between the non-inductive absorption capacitor component and the non-inductive absorption resistor component and is fixed to the water-cooled radiator plate through a plurality of insulating plate support columns.

[0015] The technical solution of the utility model proposes a high-frequency high-power transformer-end RC absorption circuit, which can be directly connected in parallel to the primary input end of the high-frequency high-power transformer, can suppress high-frequency parasitic oscillations in the system, prevent overcurrent and overtemperature of the inverter power tube, and greatly improve the reliability and stability of the high-power high-frequency power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural front view of a high-frequency high-power transformer end RC absorption circuit;

[0017] Figure 2 It is a top view of the structure of a high-frequency high-power transformer end RC absorption circuit;

[0018] Figure 3 It is a bottom view of the structure of a high-frequency high-power transformer end RC absorption circuit;

[0019] Figure 4 It is a right side view of the structure of a high frequency and high power transformer end RC absorption circuit;

[0020] Figure 5 It is a AA cross-sectional view of the main view of a high-frequency high-power transformer end RC absorption circuit;

[0021] Figure 6 It is a BB cross-sectional view of the main view of a high-frequency high-power transformer end RC absorption circuit;

[0022] Figure 7The CC cross-sectional view is a main view of an RC absorption circuit at the end of a high-frequency and high-power transformer.

[0023] Reference numerals:

[0024] 1- non-inductive absorption capacitor; 2- bottom capacitor connected in series with copper bar horizontally;

[0025] 3-insulation board; 4-insulation board support column;

[0026] 5- non-inductive absorption resistor; 6- water cooling radiator plate; 7- water cooling copper tube;

[0027] 8-first water connector; 9-second water connector;

[0028] 10- copper busbar connecting the first resistor group; 11- copper busbar connecting the second resistor group;

[0029] 12-The first absorption capacitor group is connected to the copper busbar externally; 13-The second absorption capacitor group is connected to the copper busbar externally;

[0030] 14-top capacitors are connected in series with copper bars horizontally; 15-capacitors are connected in series with copper bars vertically;

[0031] 16-the first non-inductive absorption resistor is externally connected to the copper busbar; 17-the second non-inductive absorption resistor is externally connected to the copper busbar; 18-the third resistor groups are connected to the copper busbar. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0033] like Figure 1-7 As shown, the utility model provides a high-frequency high-power transformer end RC absorption circuit, which is mainly composed of a non-inductive absorption capacitor component, a non-inductive absorption resistor component, and a heat sink.

[0034] All non-inductive absorption resistor components are installed on one surface of the radiator copper plate. The non-inductive absorption capacitor component can be located on the top of the non-inductive absorption resistor component or installed in other positions and connected to the non-inductive absorption resistor component through a copper busbar.

[0035] Among them, the non-inductive absorption capacitor component is a plurality of non-inductive absorption capacitors 1 connected in series through a plurality of capacitor transverse series copper bars 14, a longitudinal capacitor series copper bar 15, and a plurality of bottom capacitor transverse series copper bars 2, and then connected to the first non-inductive absorption resistor external connection copper bar 16 in the non-inductive absorption resistor component through the first absorption capacitor group external connection copper bar 12, and the second absorption capacitor group external connection copper bar 13 is connected to one pole of the primary winding of the high-frequency high-power transformer. Among them, each group of non-inductive absorption capacitors 1 is a plurality of capacitors connected in series.

[0036] The non-inductive absorption resistor assembly is formed by connecting multiple non-inductive absorption resistors 5 in parallel, and then connecting multiple groups of resistors in series. In this case, 24 non-inductive absorption resistors 5 are used, divided into 4 groups, each group of 6 is connected in parallel, and then 4 groups are connected in series. Figure 5 In the figure, the 24 non-inductive absorption resistors 5 are divided into an upper row and a lower row, with 12 resistors in each row. The 12 non-inductive absorption resistors 5 in the upper row and the 12 non-inductive absorption resistors 5 in the lower row are connected in parallel. Figure 5 Counting from left to right in the middle and lower rows, the right pins of the 1st to 6th non-inductive absorption resistors 5 are all connected to the first resistor group connection copper bar 10, the right pins of the 7th to 12th non-inductive absorption resistors 5 in the lower row from left to right are connected to the second resistor group connection copper bar 11, the left pins of the 4th to 9th non-inductive absorption resistors 5 in the upper row from left to right are connected to the third resistor group connection copper bar 18, the left pins of the 1st to 3rd non-inductive absorption resistors 5 in the upper row from left to right are connected to the first non-inductive absorption resistor external connection copper bar 16, the left pins of the 9th to 12th non-inductive absorption resistors 5 in the upper row from left to right are connected to the second non-inductive absorption resistor external connection copper bar 17, and then connected to the first absorption capacitor group external connection copper bar 12 through the first non-inductive absorption resistor external connection copper bar 16, and the second non-inductive absorption resistor external connection copper bar 17 is connected to the other pole of the primary winding of the high-frequency high-power transformer. Therefore, the non-inductive absorption capacitor group is connected in series with the non-inductive absorption resistor component and then connected in parallel with the primary winding of the high-frequency high-power transformer.

[0037] The utility model designs a high-frequency and high-power transformer-end RC absorption circuit, which adopts a plurality of low-leakage inductance and high-voltage resistant resonant capacitors connected in series to form an absorption capacitor group. The capacitor groups are closely arranged to reduce the connection inductance, and a plurality of non-inductive resistors are connected in parallel, and then a plurality of groups are connected in series to form an absorption resistor component, which is arranged in a low-leakage inductance connection mode to minimize the system leakage inductance.

[0038] All non-inductive absorption resistors 5 are installed on one surface of the water-cooled radiator plate 6, and a water-cooled copper tube 7 is welded to the other surface of the water-cooled radiator plate 6. A first water joint 8 and a second water joint 9 are welded to both ends of the water-cooled copper tube 7. Cooling water flows in and out of the first water joint 8 and the second water joint 9. The cooling water flows through the water-cooled copper tube 7 to take away the heat of the water-cooled radiator plate 6, and the water-cooled radiator plate 6 takes away the heat of the non-inductive absorption resistor 5.

[0039] The utility model designs a water-cooled radiator plate, and all non-inductive resistors are mounted on the radiator plate, which can quickly take away the heat of the resistors and prevent the resistors from being burned out due to overheating.

[0040] The insulating plate 3 is fixed on the water-cooled radiator plate 6 through multiple insulating plate support columns 4. The insulating plate 3 is installed between the non-inductive absorption capacitor component and the non-inductive absorption resistor component to support the non-inductive absorption capacitor component and isolate the absorption capacitor component from the absorption resistor component to prevent internal short circuit.

[0041] The utility model designs a high-frequency high-power transformer end RC absorption circuit, which adopts modular design. Resistors, capacitors, heat sinks, etc. are designed into compact components with small size and convenient installation. It can be mass-produced, easy to install and maintain, and saves costs.

Claims

1. A high-frequency high-power transformer end RC absorption circuit, characterized in that: It includes a non-inductive absorption capacitor component and a non-inductive absorption resistor component; The non-inductive absorption capacitor components include: A plurality of non-inductive absorption capacitors are connected in series in sequence through a plurality of top capacitors connected transversely in series with copper bars, a capacitor connected longitudinally with a copper bar, and a plurality of bottom capacitors connected transversely with copper bars, and the non-inductive absorption capacitor at one end is electrically connected to the copper bar connected to the outside of the first absorption capacitor group; The non-inductive absorption resistor components include: Several non-inductive absorption resistors among the plurality of parallel non-inductive absorption resistors are respectively connected in parallel through the first resistor group connecting copper bar, the second resistor group connecting copper bar, the third resistor group connecting copper bar, and the second non-inductive absorption resistor externally connected copper bar, and then connected in series through the second non-inductive absorption resistor externally connected copper bar to form a whole; The first absorption capacitor group is externally connected to the copper bar and the first non-inductive absorption resistor is externally connected to the copper bar, the second absorption capacitor group is externally connected to the copper bar and one pole of the primary winding of the high-frequency high-power transformer, and the second non-inductive absorption resistor is externally connected to the copper bar and the other pole of the primary winding of the high-frequency high-power transformer.

2. A high-frequency high-power transformer end RC absorption circuit as claimed in claim 1, characterized in that: The non-inductive absorption capacitor is a plurality of capacitors connected in series.

3. A high-frequency high-power transformer end RC absorption circuit as claimed in claim 1, characterized in that: Also included is a radiator, which includes: a water-cooled radiator plate, a water-cooled copper pipe, a first water joint and a second water joint; One side of the water-cooled radiator plate is connected to the non-inductive absorption resistor, and the other side is welded to the water-cooled copper tube, and the first water joint and the second water joint are welded to both ends of the water-cooled copper tube respectively; The first water connector and the second water connector are used for the inlet and outlet of cooling water.

4. A high-frequency high-power transformer end RC absorption circuit as claimed in claim 3, characterized in that: It also includes an insulating plate, which is arranged between the non-inductive absorption capacitor component and the non-inductive absorption resistor component and is fixed to the water-cooled radiator plate through a plurality of insulating plate support columns.

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