Single-phase low-voltage large-current rectifier

Abstract

The utility model discloses a single-phase low-voltage large-current rectifier, which belongs to the technical field of rectifiers, and comprises a box body, two secondary MOS (Metal Oxide Semiconductor) rectifying plates are arranged in the box body, are arranged in parallel and are electrically connected with an isolation transformer, the isolation transformer is positioned above the two secondary MOS rectifying plates, and the two secondary MOS rectifying plates are electrically connected with the isolation transformer. The isolation transformer is electrically connected with one end of the IGBT phase-shifted full-bridge inverter module, and the other end of the IGBT phase-shifted full-bridge inverter module is electrically connected with the single-phase APFC rectifier module; the single-phase APFC rectifier module and the IGBT phase-shifted full-bridge inverter module are both arranged on one side of the isolation transformer; the single-phase APFC rectifier module is electrically connected with the circuit breaker, the circuit breaker and the control panel are electrically connected and are both arranged in a protection plate on one side of the box body, and a PWM speed regulation fan is arranged below the control panel and is electrically connected with the control panel. By adopting the single-phase low-voltage large-current rectifier, harmonic current generated by a power supply can be effectively reduced, the equipment integration degree is high, the operation is stable, and the temperature excursion during working is small.

Description

Technical Field

[0001] The utility model relates to the technical field of rectifiers, in particular to a single-phase low-voltage and high-current rectifier. Background Art

[0002] In the prior art, with the maturity of high-frequency switching devices and application technology, they are used more and more widely, especially the rectifier power supply technology. High-frequency switching rectifiers have the advantages of small size, light weight, low manufacturing cost, and high control accuracy, and are the best choice for experimental power supplies. However, in some experimental environments, there is only single-phase power supply. Therefore, as an experimental power supply, a single-phase incoming line needs to be used according to user needs. At the same time, there are many instruments on the experimental site. In order not to affect the normal operation of other equipment, the experimental power supply needs to have an active power factor correction (APFC) unit to reduce the harmonics generated by the power supply. Summary of the invention

[0003] The utility model aims to provide a single-phase low-voltage high-current rectifier, which can effectively reduce the harmonic current generated by the power supply, has high equipment integration, stable operation and small temperature drift during operation.

[0004] To achieve the above-mentioned purpose, the utility model provides a single-phase low-voltage and high-current rectifier, including a box body, wherein two secondary MOS rectifier plates are arranged in parallel and electrically connected to an isolation transformer, wherein the isolation transformer is located above the two secondary MOS rectifier plates, and the isolation transformer is electrically connected to one end of an IGBT phase-shift full-bridge inverter module, and the other end of the IGBT phase-shift full-bridge inverter module is electrically connected to a single-phase APFC rectifier module; the single-phase APFC rectifier module and the IGBT phase-shift full-bridge inverter module are both arranged on one side of the isolation transformer; the single-phase APFC rectifier module is electrically connected to a circuit breaker, and the circuit breaker is electrically connected to a control board and both are arranged in a protective plate on one side of the box body, and a PWM speed regulating fan is arranged below the control board and is electrically connected to the control board.

[0005] Preferably, the side of the box body opposite to the protective plate is a ventilation plate.

[0006] Preferably, the ventilation plate is provided with power terminals, a DC output negative pole and a DC output positive pole; the power terminals are electrically connected to the circuit breaker; the DC output negative pole and the DC output positive pole are electrically connected to the two secondary MOS rectifier boards respectively.

[0007] Preferably, the secondary MOS rectifier board is provided with a rectifier MOS tube and a drive voltage limiting protection MOS tube; the rectifier circuit composed of a number of the rectifier MOS tubes and the drive voltage limiting protection MOS tube are both arranged on a PCB board, the drive voltage limiting protection MOS tube is electrically connected to the rectifier circuit, and the isolation transformer is electrically connected to the drive voltage limiting protection MOS tube.

[0008] Preferably, an interlocking signal terminal, a status indicator light and a push-pull handle are installed on the protection plate; the interlocking signal terminal and the status indicator light are electrically connected to the control board respectively.

[0009] Preferably, an air inlet is provided on the protective plate, and a filter is provided on the outer side of the air inlet.

[0010] Preferably, the PWM speed-regulating fan is arranged opposite to the filter, and there are at least two PWM speed-regulating fans.

[0011] Therefore, the beneficial effects of the utility model using the above-mentioned single-phase low-voltage high-current rectifier are:

[0012] (1) The utility model adopts a single-phase APFC circuit for incoming line rectification, which can improve the power factor of the equipment. The primary inverter circuit adopts a phase-shifted full-bridge circuit, which can realize the soft switching of the power switch tube and improve the equipment operation efficiency.

[0013] (2) Secondary synchronous rectification connects the parallel rectifier MOS tube and the driver voltage limiting protection

[0014] All MOS tubes are integrated on a PCB board, which improves the integration of the equipment and ensures the stability of operation.

[0015] (3) Using PWM speed-controlled fans for heat dissipation keeps the operating temperature of the equipment within a reasonable range, reducing the temperature drift of the equipment.

[0016] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the internal structure of an embodiment of a single-phase low-voltage high-current rectifier of the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of a single-phase low-voltage high-current rectifier of the utility model;

[0019] Figure 3 It is a front view schematic diagram of an embodiment of a single-phase low-voltage high-current rectifier of the utility model;

[0020] Figure 4It is a rear view schematic diagram of an embodiment of a single-phase low-voltage high-current rectifier of the utility model;

[0021] Figure 5 It is a side view schematic diagram of an embodiment of a single-phase low-voltage high-current rectifier of the utility model;

[0022] Figure 6 It is a top view schematic diagram of an embodiment of a single-phase low-voltage high-current rectifier of the utility model;

[0023] Figure 7 It is a three-dimensional structural diagram of the secondary MOS rectifier board;

[0024] Figure 8 The utility model discloses a circuit diagram of a single-phase low-voltage high-current rectifier.

[0025] Reference numerals

[0026] 1. Box; 2. Single-phase APFC rectifier module; 3. Control board; 4. Secondary MOS rectifier board; 41. Rectifier MOS tube; 42. Drive voltage limiting protection MOS tube; 43. PCB board; 5. Isolation transformer; 6. IGBT phase-shifted full-bridge inverter module; 7. PWM speed regulating fan; 8. Circuit breaker; 9. Power terminal; 10. DC output negative pole; 11. DC output positive pole; 12. Protective plate; 13. Ventilation plate; 14. Push-pull handle; 15. Interlocking signal terminal; 16. Status indicator light; 17. Filter. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Example

[0030] like Figure 1As shown, the utility model provides a single-phase low-voltage high-current rectifier, including a box 1, in which two secondary MOS rectifier boards 4 are arranged, and the two secondary MOS rectifier boards 4 are arranged in parallel and electrically connected to an isolation transformer 5, and the isolation transformer 5 is located above the two secondary MOS rectifier boards 4. The isolation transformer 5 is electrically connected to one end of an IGBT phase-shift full-bridge inverter module 6, and the other end of the IGBT phase-shift full-bridge inverter module 6 is electrically connected to a single-phase APFC rectifier module 2, and the single-phase APFC rectifier module 2 and the IGBT phase-shift full-bridge inverter module 6 are both arranged on one side of the isolation transformer 5.

[0031] The single-phase APFC rectifier module 2 is electrically connected to the circuit breaker 8 , which is electrically connected to the control board 3 and both are arranged in the protective plate 12 on one side of the box body 1 , and a PWM speed regulating fan 7 is arranged below the control board 3 and is electrically connected to the control board 3 .

[0032] like Figure 2 and Figure 3 As shown, the protection plate 12 is provided with an interlocking signal terminal 15 , a status indicator light 16 and a push-pull handle 14 , and the interlocking signal terminal 15 and the status indicator light 16 are electrically connected to the control board 3 , respectively.

[0033] The protective plate 12 is provided with an air inlet, and a filter 17 is provided outside the air inlet to filter impurities in the air and prevent the impurities from easily entering the interior of the box 1. The PWM speed regulating fan 7 is arranged opposite to the filter 17, and there are at least two PWM speed regulating fans, which can accelerate the circulation of gas and improve the heat dissipation effect of the rectifier.

[0034] like Figure 4 , Figure 5 and Figure 6 As shown, the side of the box body 1 opposite to the protective plate 12 is a ventilation plate 13, and the ventilation plate 13 is provided with a power terminal 9, a DC output negative pole 10 and a DC output positive pole 11. The power terminal 9 is electrically connected to the circuit breaker 8, and the DC output negative pole 10 and the DC output positive pole 11 are electrically connected to the two secondary MOS rectifier plates 4 respectively.

[0035] like Figure 7As shown, the secondary MOS rectifier board 4 is provided with a rectifier MOS tube 41 and a drive voltage limiting protection MOS tube 42. The rectifier circuit composed of a plurality of rectifier MOS tubes 41 and the drive voltage limiting protection MOS tube 42 are both provided on a PCB board 43. The drive voltage limiting protection MOS tube 42 is electrically connected to the rectifier circuit, and the isolation transformer 5 is electrically connected to the drive voltage limiting protection MOS tube 42. The on-off control of the rectifier MOS tube 41 can be directly completed without adding other circuits, which greatly improves the integration of the equipment and the current sharing effect of the rectifier MOS tube 41, making the operation stability of the equipment higher. The circuit connection structure of the circuit breaker 8, the single-phase APFC rectifier module 2, the IGBT phase-shifted full-bridge inverter module 6, the isolation transformer 5 and the secondary MOS rectifier board 4 is shown in FIG. Figure 8 shown.

[0036] During use:

[0037] The AC signal enters the circuit breaker 8 through the power connection terminal 9 provided on one side of the box 1, and is rectified into a DC voltage by the single-phase APFC rectifier circuit in the single-phase APFC rectifier module 2 to achieve AC / DC conversion. Then, it is converted into a high-frequency AC square wave voltage by the IGBT phase-shifted full-bridge inverter circuit of the IGBT phase-shifted full-bridge inverter module 6. The rectifier circuits of the isolation transformer 5 and the secondary MOS rectifier board 4 adopt a synchronous rectification mode, and each group of synchronous rectification adopts a plurality of rectifier MOS tubes 41 connected in parallel to rectify into a DC voltage output.

[0038] Among them, a single-phase APFC rectifier circuit is used to realize active power factor correction, which can reduce the harmonic current of the equipment. The rectifier circuit adopts a parallel connection of multiple rectifier MOS tubes 41 to realize secondary large current output.

[0039] The heat dissipation of the equipment adopts PWM speed regulating fan to automatically adjust the fan speed according to the operating temperature and output current, so that the equipment always operates in a reasonable temperature range and reduces the temperature drift problem caused by excessive temperature changes.

[0040] Therefore, the utility model adopts the above-mentioned single-phase low-voltage high-current rectifier, which can effectively reduce the harmonic current generated by the power supply, has high equipment integration, stable operation, and small temperature drift during operation.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A single-phase low-voltage high-current rectifier, comprising a box, characterized in that: Two secondary MOS rectifier plates are arranged in the box, and the two secondary MOS rectifier plates are arranged in parallel and electrically connected to the isolation transformer. The isolation transformer is located above the two secondary MOS rectifier plates, and the isolation transformer is electrically connected to one end of the IGBT phase-shift full-bridge inverter module, and the other end of the IGBT phase-shift full-bridge inverter module is electrically connected to the single-phase APFC rectifier module; the single-phase APFC rectifier module and the IGBT phase-shift full-bridge inverter module are both arranged on one side of the isolation transformer; the single-phase APFC rectifier module is electrically connected to the circuit breaker, and the circuit breaker is electrically connected to the control board and both are arranged in the protective plate on one side of the box, and a PWM speed regulating fan is arranged below the control board and is electrically connected to the control board.

2. A single-phase low-voltage high-current rectifier according to claim 1, characterized in that: A side of the box body opposite to the protective plate is a ventilation plate.

3. A single-phase low-voltage high-current rectifier according to claim 2, characterized in that: The ventilation plate is provided with a power connection terminal, a DC output negative electrode and a DC output positive electrode; the power connection terminal is electrically connected to the circuit breaker; the DC output negative electrode and the DC output positive electrode are electrically connected to the two secondary MOS rectifier boards respectively.

4. The single-phase low-voltage high-current rectifier according to claim 1, characterized in that: The secondary MOS rectifier board is provided with a rectifier MOS tube and a drive voltage limiting protection MOS tube; the rectifier circuit composed of a number of the rectifier MOS tubes and the drive voltage limiting protection MOS tube are both arranged on a PCB board, the drive voltage limiting protection MOS tube is electrically connected to the rectifier circuit, and the isolation transformer is electrically connected to the drive voltage limiting protection MOS tube.

5. The single-phase low-voltage high-current rectifier according to claim 1, characterized in that: The protection plate is provided with an interlocking signal terminal, a status indicator light and a push-pull handle; the interlocking signal terminal and the status indicator light are electrically connected to the control board respectively.

6. The single-phase low-voltage high-current rectifier according to claim 1, characterized in that: An air inlet is arranged on the protective plate, and a filter is arranged on the outer side of the air inlet.

7. A single-phase low-voltage high-current rectifier according to claim 6, characterized in that: The PWM speed regulating fan is arranged opposite to the filter screen, and there are at least two PWM speed regulating fans.

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