CN217721036U

CN217721036U - Inverter rear-stage circuit board structure

Info

Publication number: CN217721036U
Application number: CN202221576975.5U
Authority: CN
Inventors: 沈红东; 敬文毅
Original assignee: Nanjing Lishida Welding Technology Co ltd
Current assignee: Nanjing Lishida Welding Technology Co ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-11-01
Anticipated expiration: 2032-06-23

Abstract

The utility model discloses an inverter back stage circuit board structure, it includes back stage PCB board to and radiator, switch tube unit, rectifier tube unit, electrolytic capacitor unit, resonance capacitor unit, filter inductance, mutual-inductor, common mode inductance and the sampling resistor of fixing on back stage PCB board, one side of switch tube unit and rectifier tube unit all is provided with the radiator, electrolytic capacitor unit, rectifier tube unit and resonance capacitor unit set up the preceding tip at back stage PCB board, filter inductance, mutual-inductor and common mode inductance set up the back tip at back stage PCB board, the switch tube unit sets up to two rows, sets up respectively in the middle part both sides at back stage PCB board, sampling resistor and filter capacitor unit set up between the switch tube unit of the middle part of PCB board and both sides. The utility model discloses reduced generating line ripple voltage, solved the parallelly connected problem of flow equalizing of switch tube, improved the switch tube radiating effect, still reduced the maintenance after sales expense.

Description

Inverter rear-stage circuit board structure

Technical Field

The utility model relates to an inverter technical field, in particular to dc-to-ac converter back stage circuit board structure.

Background

The inverter converts direct current electric energy (batteries and storage batteries) into alternating current (generally 220V and 50Hz sine waves). It is composed of inverter bridge, control logic and filter circuit. The inverter is a transformer of DCtoAC, is a voltage inversion process with the converter, and is widely applied to office equipment and domestic appliances. Inverters are largely classified into two categories, one by the wave-string property and the other by the source-flow property. The inverter has the characteristics of high conversion efficiency, quick start, good safety performance, good physical performance, and strong adaptability and stability with load.

The problems with the current conventional inverter are: (1) The rear-level high-frequency filter capacitor is too small, and the voltage of a bus ripple is too large, so that the switch tube is not enough in voltage resistance and damaged by breakdown; (2) 4 groups of switch tube units are arranged in a row at the rear stage of the existing inverter, which is not beneficial to the parallel connection and current sharing of the switch tubes; (3) The existing inverter has unreasonable air duct design, which can cause uneven heat dissipation of the switch tube and damage the switch tube; (4) The front stage and the rear stage of the existing inverter are arranged on a PCB, and when a switch tube is damaged, a PCB copper foil is easily damaged, so that the whole inverter is scrapped.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a problem that exists just in order to solve above-mentioned dc-to-ac converter back level, and then provide an inverter back level circuit board structure.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an inverter rear stage circuit board structure, its includes the rear stage PCB board to and fix radiator, switch tube unit, rectifier tube unit, electrolytic capacitor unit, resonance capacitor unit, filter inductance, mutual-inductor, common mode inductance and the sampling resistor on the rear stage PCB board, one side of switch tube unit and rectifier tube unit all is provided with the radiator, electrolytic capacitor unit, rectifier tube unit and resonance capacitor unit set up the preceding tip at the rear stage PCB board, filter inductance, mutual-inductor and common mode inductance set up the back tip at the rear stage PCB board, the switch tube unit sets up to two rows, sets up respectively in the middle part both sides at the rear stage PCB board, sampling resistor and filter capacitor unit set up between the switch tube unit of the middle part and both sides of PCB board.

Furthermore, a transformer secondary terminal and an alternating current output terminal are further arranged on the rear-stage PCB, the transformer secondary terminal is connected with the inverter front-stage circuit board, and the alternating current output terminal is connected with a load end.

Further, the transformer secondary terminal is arranged at the front end of the rear-stage PCB, and the alternating current output terminal is arranged at the rear end of the rear-stage PCB.

Furthermore, the rectifier tube unit comprises four rectifier tubes, the four rectifier tubes are arranged into two rows, each row is two, and the radiator is arranged between the two rows of rectifier tubes.

Furthermore, the switch tube units are provided with four groups, namely a first switch tube unit, a second switch tube unit, a third switch tube unit and a fourth switch tube unit, wherein the first switch tube unit and the second switch tube unit are located in the same row, and the third switch tube unit and the fourth switch tube unit are located in the same row.

Furthermore, each group of switch tube units comprises two switch tubes, and each switch tube is tightly pressed and attached to the radiator through a bolt.

Further, the radiator sets up three groups altogether, is first radiator, second radiator and third radiator respectively, wherein first radiator and second radiator are installed respectively in the inboard of every row of switch tube unit, the third radiator is installed between the rectifier tube.

Further, the radiator is an aluminum finned radiator.

Compared with the prior art, the beneficial effects of the utility model are that: according to the switch tube, through reasonable layout of all devices, the ripple voltage of a bus is reduced, the problem of parallel flow equalization of the switch tubes is solved, the heat dissipation effect of the switch tubes is improved, and the after-sale cost of maintenance of scrapped complete machines due to damage of the switch tubes is reduced; the method comprises the following specific steps:

(1) This patent is with a plurality of filter capacitor layouts near the switch tube, has effectively reduced generating line ripple voltage, has protected the switch tube.

(2) This patent lets the parallelly connected switch tube of every unit effectively flow equalize with two liang of layouts side by side of 4 group switch tube units.

(3) This patent is with two liang of layouts side by side of 4 group switch tube units in the wind channel, has improved the radiating effect of switch tube effectively.

(4) This patent is separated preceding stage and back level and the control unit PCB, has avoided causing the PCB copper foil to damage because of the switch tube is exploded to cause the dc-to-ac converter complete machine to scrap, has reduced the maintenance after sale expense by a wide margin.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of the present invention;

fig. 3 is a front view of the present invention;

fig. 4 is a left side view of the present invention;

fig. 5 is a right side view of the present invention;

fig. 6 is a top view of the present invention;

fig. 7 is a bottom view of the present invention.

In the figure: 1. the transformer comprises a rear-stage PCB (printed circuit board), 2, a heat dissipation structure, 3, a switch tube unit, 4, a rectifier tube unit, 5, a transformer secondary terminal, 6, an alternating current output terminal, 7, an electrolytic capacitor unit, 8, a resonance capacitor unit, 9, a filter capacitor unit, 10, a filter inductor, 11, a mutual inductor, 12, a common-mode inductor, 13, a sampling resistor, 201, a first radiator, 202, a second radiator, 203, a third radiator, 301, a first switch tube unit, 302, a second switch tube unit, 303, a third switch tube unit, 304 and a fourth switch tube unit.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

As shown in fig. 1 to 7, an inverter rear circuit board structure includes a rear PCB 1, and a heat sink 2, a switching tube unit 3, a rectifier tube unit 4, an electrolytic capacitor unit 7, a resonant capacitor unit 8, a filter capacitor unit 9, a filter inductor 10, a transformer 11, a common mode inductor 12, and a sampling resistor 13 fixed on the rear PCB 1, the heat sink is disposed on one side of the switching tube unit 3 and one side of the rectifier tube unit 4, the electrolytic capacitor unit 7, the rectifier tube unit 4, and the resonant capacitor unit 8 are disposed on the front end of the rear PCB 1, the filter inductor 10, the transformer 11, and the common mode inductor 12 are disposed on the rear end of the rear PCB 1, the switching tube units 3 are disposed in two rows and disposed on two sides of the middle of the rear PCB 1, respectively, and the sampling resistor 13 and the filter capacitor unit are disposed between the switching tube units 3 on the middle and two sides of the PCB 1.

In this embodiment, the rear PCB 1 is further provided with a transformer secondary terminal 5 and an ac output terminal 6, and the transformer secondary terminal 5 is connected to the inverter front stage circuit board, and the ac output terminal 6 is connected to the load terminal. The transformer secondary terminal 5 is arranged at the front end of the rear-stage PCB 1, and the alternating current output terminal 6 is arranged at the rear end of the rear-stage PCB 1.

In this embodiment, the rectifier tube unit 4 includes four rectifier tubes, and the four rectifier tubes are arranged in two rows, two for each row, and the heat sink is located and installed between two rows of rectifier tubes.

In this embodiment, the switch tube units 3 are provided in four groups, which are respectively a first switch tube unit 301, a second switch tube unit 302, a third switch tube unit 303 and a fourth switch tube unit 304, where the first switch tube unit 301 and the second switch tube unit 302 are located in the same row, and the third switch tube unit 303 and the fourth switch tube unit 304 are located in the same row. Wherein, every group switch tube unit contains two switch tubes, and each switch tube compresses tightly the laminating through bolt and radiator.

In this embodiment, the radiators are provided with three groups, which are a first radiator 201, a second radiator 202 and a third radiator 203, wherein the first radiator 201 and the second radiator 202 are respectively installed inside each row of the switching tube units, and the third radiator 203 is installed between the rectifier tubes. Wherein the radiator adopts an aluminum finned radiator.

In the above embodiments, the number of the rectifier, the switch, the capacitor or other devices may be adjusted adaptively according to actual conditions, for example, the number of the rectifier, the switch, the capacitor or other devices may be increased or decreased, and all of them should be within the protection scope of this patent.

The utility model discloses the working process: high-frequency alternating current is input from a secondary binding post of the transformer, passes through the resonant capacitor, is rectified by 4 groups of rectifier tubes and filtered by an electrolytic capacitor, and is converted into direct-current voltage. After the direct current voltage passes through the sampling resistor and the filter capacitor, the direct current voltage is converted into alternating current by 4 groups of switch tube units, and the alternating current is smoothly filtered by the filter inductor and the filter capacitor and then is output from an alternating current output binding post through the mutual inductor and the common mode inductor.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by using equivalent substitution modes and the like fall within the scope of the present invention.

The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.

Claims

1. The utility model provides an inverter rear stage circuit board structure, its characterized in that, includes rear stage PCB board (1) to and radiator (2), switch tube unit (3), rectifier tube unit (4), electrolytic capacitor unit (7), resonance capacitor unit (8), filter capacitor unit (9), filter inductance (10), mutual-inductor (11), common mode inductor (12) and sampling resistor (13) of fixing on rear stage PCB board (1), one side of switch tube unit (3) and rectifier tube unit (4) all is provided with the radiator, electrolytic capacitor unit (7), rectifier tube unit (4) and resonance capacitor unit (8) set up the preceding tip at rear stage PCB board (1), filter inductance (10), mutual-inductor (11) and common mode inductor (12) set up the back tip at rear stage PCB board (1), switch tube unit (3) sets up to two rows, sets up respectively in the middle part both sides at rear stage PCB board (1), sampling resistor (13) and filter capacitor unit (9) set up between the middle part of PCB board (1) and switch tube unit (3) of both sides.

2. The inverter rear stage circuit board structure according to claim 1, wherein the rear stage PCB board (1) is further provided with a transformer secondary terminal (5) and an ac output terminal (6), the transformer secondary terminal (5) is connected to the inverter front stage circuit board, and the ac output terminal (6) is connected to a load terminal.

3. The inverter rear stage circuit board structure according to claim 2, wherein the transformer secondary terminal (5) is disposed at a front end of the rear stage PCB (1), and the ac output terminal (6) is disposed at a rear end of the rear stage PCB (1).

4. The inverter back-stage circuit board structure according to claim 1, wherein the rectifier cell (4) comprises four rectifiers, and the four rectifiers are arranged in two rows, two for each row, and the heat sink is located between the two rows of rectifiers.

5. The inverter rear stage circuit board structure according to claim 1, wherein the switch tube units (3) are arranged in four groups, namely a first switch tube unit (301), a second switch tube unit (302), a third switch tube unit (303) and a fourth switch tube unit (304), wherein the first switch tube unit (301) and the second switch tube unit (302) are located in the same row, and the third switch tube unit (303) and the fourth switch tube unit (304) are located in the same row.

6. The inverter rear stage circuit board structure of claim 5, wherein each group of the switch tube units comprises two switch tubes, and each switch tube is tightly attached to the heat sink through a bolt.

7. The inverter back stage circuit board structure of claim 1, wherein the heat sinks are arranged in three groups, namely a first heat sink (201), a second heat sink (202) and a third heat sink (203), wherein the first heat sink (201) and the second heat sink (202) are respectively installed at the inner side of each row of the switch tube units, and the third heat sink (203) is installed between the rectifier tubes.

8. The inverter rear stage circuit board structure according to claim 1 or 7, wherein the heat sink is an aluminum finned heat sink.