Diode rectification unit

Abstract

The diode rectification unit comprises a box body, an electric reactor, a rectification module and a fusible core module, and the box body is provided with an alternating current quick plug male head and a direct current output terminal; the device is characterized in that a buffer module composed of a buffer contactor and a buffer resistor is arranged on the direct-current output side of the rectifier module, and the positive electrode of the direct-current side of the diode rectifier bridge is connected to the front end of the fusible core through the buffer contactor; a lower slow charging terminal is connected to the copper bar between the diode rectifier bridge and the buffer contactor, an upper slow charging terminal is connected to the copper bar between the buffer contactor and the fusible core, and the lower slow charging terminal and the upper slow charging terminal are connected to the two ends of the buffer resistor through cables respectively. According to the diode rectification unit, the direct current bus capacitor is charged through current limiting of the buffer resistor, overcharge of the capacitor is avoided, and compared with an existing mode that a buffer module is arranged on the direct current side of an arrangement power supply, wiring is simple, and cabinet combination operation of the rectification unit, a front-end wire inlet cabinet and a rear-end inverter cabinet can be better achieved.

Description

Technical Field

[0001] The utility model relates to a diode rectifier unit, and more specifically, to a diode rectifier unit with a buffer module arranged on a DC side. Background Art

[0002] The rectifier unit (also called rectifier module) is used to convert the input AC power into DC power. When the rectifier unit is used in the inverter, the rectifier unit needs to convert the external input AC power into DC power, and the DC power is connected to the DC bus to realize the power supply to the inverter unit. In the actual circuit of the rectifier unit, in order to realize the slow charging of the bus capacitor on the DC bus, a buffer module will be set on the AC side of the rectifier unit. The buffer module is usually composed of a buffer resistor. Through the current limiting of the buffer resistor, the DC voltage output by the rectifier unit is slowly increased to realize the slow charging of the bus capacitor, avoiding the damage of the bus capacitor caused by over-fast charging.

[0003] However, the buffer module is arranged on the AC side of the rectifier unit, which makes the cabinet connection of the unit more complicated, that is, the connection between the rectifier unit and the incoming line cabinet is complicated. If the buffer module can be arranged on the DC side of the rectifier unit, the cabinet connection of the rectifier unit will be simplified, but there is currently no rectifier unit with a buffer module arranged on the DC side.

[0004] In order to protect the rectifier unit and prevent the electronic components in the rectifier unit from being damaged due to overcurrent, a fuse module is usually set at the output end of the rectifier unit. After the fuse is blown due to overcurrent protection, the fuse needs to be replaced. However, the replacement of the existing fuse requires disassembly of the shell, and the steps are cumbersome and complicated. Summary of the invention

[0005] In order to overcome the disadvantages of the above technical problems, the utility model provides a diode rectification unit.

[0006] The diode rectifier unit of the utility model comprises a box body and a reactor, a rectifier module and a fuse module arranged in the box body. The box body is provided with an AC quick-plug male connector and a DC output terminal. The rectifier module is composed of a finned heat sink and three diode rectifier bridges fixed on the finned heat sink. The fuse module is composed of two fuses. The input end of the reactor is connected to the AC quick-plug male connector via a copper bar, and the output end of the reactor is connected to the AC input end of the diode rectifier bridge via a copper bar. The DC side negative pole of the diode rectifier bridge is connected to the front end of a fuse via a copper bar, and the rear ends of the two fuses are connected to the DC output terminal. The invention is characterized in that: a buffer module is arranged on the DC output side of the rectifier module, the buffer module is composed of a buffer contactor and a buffer resistor, the DC side positive pole of the diode rectifier bridge is connected to the input end of the buffer contactor through a copper bar, and the output end of the buffer contactor is connected to the front end of another fuse through a copper bar; a lower buffer charging terminal is connected to the copper bar between the DC side positive pole of the diode rectifier bridge and the input end of the buffer contactor, an upper buffer charging terminal is connected to the copper bar between the output end of the buffer contactor and the fuse, and the lower buffer charging terminal and the upper buffer charging terminal are respectively connected to the two ends of the buffer resistor through cables.

[0007] The diode rectifier unit of the utility model is provided with a detachable panel on the compartment outside the fuse core, an L-shaped copper bar is provided at the front end of the fuse core, connecting bolts are provided on the L-shaped copper bar, and fixing bolts for connecting the front end and the rear end of the fuse core are provided on the fuse core.

[0008] The diode rectifier unit of the utility model comprises a capacitor module composed of a plurality of electrolytic capacitors, both ends of the electrolytic capacitors are connected in parallel with a discharge resistor, and both ends of the plurality of electrolytic capacitors connected in series are respectively connected to a copper busbar between a DC side negative electrode of a diode rectifier bridge and a fuse core and to a copper busbar between an output end of a slow-charging contactor and the fuse core.

[0009] The diode rectifier unit of the utility model is characterized in that the reactor is arranged in the middle and upper part of the rear of the box body, the rectifier module is arranged in the lower part of the box body, the buffer contactor is arranged in the middle and lower part of the front of the box body, the buffer contactor is located above the rectifier module, the capacitor module is arranged in the middle and upper part of the front of the box body, and the capacitor module is located above the buffer contactor; the fuse module is arranged at the top of the front of the box body, and the buffer resistor is arranged behind the fuse module.

[0010] The diode rectifier unit of the utility model is provided with side air intake grilles around the bottom of the box body, a bottom air intake grille is provided at the bottom of the box body, and an upper air outlet grille is provided at the top of the box body; a plurality of axial flow fans are provided above the bottom air intake grille, and an inclined guide plate is provided above the axial flow fans to guide the intake air to the fin heat sink.

[0011] In the diode rectifier unit of the utility model, a handle and a signal interface are arranged on the front panel of the box body, and two rows of rollers are fixed on the lower surface of the box body.

[0012] The beneficial effects of the utility model are as follows: the diode rectifier unit of the utility model is provided with a reactor, a rectifier module, a capacitor module and a fuse module in the box body, the input alternating current is connected to the alternating current input end of the rectifier module through the reactor, the rectifier module rectifies the input alternating current and outputs it through the fuse module; the DC output end of the rectifier module is provided with a buffer module composed of a slow-charging contactor and a buffer resistor, the buffer contactor is connected in series in the copper busbar between the rectifier module and the fuse, the slow-charging resistor is connected in parallel with the buffer contactor through the upper and lower buffer connections and the cable, so that at the moment when the diode rectifier power supply is powered on, the buffer contactor is in a disconnected state, the output of the rectifier module is charged with the DC bus capacitor in the inverter power supply at its rear end through the current limiting of the buffer resistor, thereby avoiding overcharging of the capacitor, and closing the buffer contactor after charging is completed to realize the normal output of the rectifier module, compared with the existing buffer module arranged on the DC side of the sorting power supply, its wiring is simple, and it is more conducive to realizing the "cabinet paralleling" operation of the rectifier unit with the front-end incoming cabinet and the rear-end inverter cabinet.

[0013] Furthermore, a removable panel is provided on the box body outside the fuse module, an L-shaped copper bar is provided at the front end of the fuse, a connecting bolt is provided on the L-shaped copper bar, and a fixing bolt is provided on the fuse to connect the front end and the rear end. In this way, when the fuse blows and needs to be replaced, the fuse can be replaced by simply removing the removable panel, unscrewing the connecting bolts and the fixing bolts, which is very convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the diode rectifier unit of the utility model;

[0015] Figure 2 It is a rear view of the diode rectifier unit of the utility model;

[0016] Figure 3 It is a left side view of the diode rectifier unit of the utility model;

[0017] Figure 4 It is a three-dimensional diagram of the diode rectifier unit of the utility model;

[0018] Figure 5 This is a front view of the diode rectifier unit of the present invention after the box is removed;

[0019] Figure 6 , Figure 7 and Figure 8 All of them are three-dimensional diagrams of the diode rectifier unit of the present invention with the box removed.

[0020] In the figure: 1 box body, 2 AC fast plug male connector, 3 DC output terminal, 4 reactor, 5 diode rectifier bridge, 6 finned heat sink, 7 buffer contactor, 8 electrolytic capacitor, 9 fuse, 10 slow charging resistor, 11 lower slow charging terminal, 12 upper slow charging terminal, 13 detachable panel, 14 L-shaped copper busbar, 15 connecting bolts, 16 fixing bolts, 17 axial flow fan, 18 side air intake grille, 19 bottom air intake grille, 20 inclined guide plate, 21 upper air outlet grille, 22 handle, 23 signal interface, 24 roller, 25 discharge resistor. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figures 1 to 4 As shown, the front view, rear view, left view and stereogram of the diode rectifier unit of the utility model are respectively given, Figure 5 The front view of the diode rectifier unit of the utility model after removing the box is given. Figure 6 , Figure 7 and Figure 8 The three-dimensional diagram of the diode rectifier unit after removing the box is given. The diode rectifier unit shown is composed of a box 1 and a reactor 4, a rectifier module, a buffer module, a capacitor module and a fuse module arranged in the box 1. The upper end of the box 1 is provided with an AC quick-plug male connector 2 and a DC output terminal 3. The rectifier module is composed of a finned heat sink 6 and three diode rectifier bridges 5 fixed on the heat absorption surface of the finned heat sink 6. The buffer module is composed of a buffer contactor 7 and a buffer resistor 10. The capacitor module is composed of a plurality of electrolytic capacitors 8. The fuse module is composed of two fuses 9.

[0023] The input end of the reactor 4 shown is connected to the AC quick-plug male connector 2 via a copper bar, and the output end of the reactor 4 is connected to the AC input and output end of the diode rectifier bridge 5 via a copper bar. The DC positive pole of the diode rectifier bridge 5 is connected to the input end of the buffer contactor 7 via a copper bar, and the output end of the buffer contactor 7 is connected to the front end of a fuse 9 via a copper bar; the DC negative pole of the diode rectifier bridge 5 is connected to the front end of another fuse 9 via a copper bar. The rear ends of the two fuses 9 are connected to the DC output terminal 3. The two ends of the multiple electrolytic capacitors 8 are connected in series, respectively, to the copper bar between the DC negative pole of the diode rectifier bridge 5 and the fuse 9 and the copper bar between the output end of the buffer contactor 7 and the fuse 9; the two ends of the electrolytic capacitor 8 are connected in parallel with a discharge resistor 25.

[0024] The copper bar between the DC positive pole of the diode rectifier bridge 5 and the buffer contactor 7 is fixedly connected with a lower slow charging terminal 11, and the copper bar between the output end of the slow charging contactor 7 and the fuse 9 is fixedly connected with an upper slow charging terminal 12, and the upper slow charging terminal 12 and the lower slow charging terminal 11 are respectively connected to the two ends of the buffer resistor 10 via cables. In this way, at the moment when the diode rectifier unit is powered on, the buffer contactor 7 is in a disconnected state, and the alternating current is input to the AC input end of the diode rectifier bridge 5 through the reactor 4, and is output through the DC output terminal 3 after rectification by the diode rectifier bridge 5. Through the current limiting of the buffer resistor 10, the DC bus capacitor in the rear inverter cabinet can be slowly charged, avoiding damage to the DC bus capacitor. Since the slow charging module is arranged on the DC side of the diode rectifier power supply, compared with being arranged on its DC side, it has the advantage of simple wiring, and is more conducive to realizing the "parallel cabinet" operation of the rectifier unit, the front-end incoming cabinet and the rear-end inverter cabinet.

[0025] The arrangement positions of the reactor 4, the rectifier module, the buffer module, the capacitor module and the fuse module inside the box 1 are as follows: the reactor 4 is fixed in the middle and upper part of the rear of the box 1, the rectifier module is located in the lower part of the cavity inside the box 1, the number of buffer contactors 7 is 2, and the 2 buffer contactors are connected in parallel. The buffer contactor 7 is located in the middle and lower part of the front of the box 1, and the buffer contactor 7 is located above the rectifier module. The electrolytic capacitor 8 is located in the middle and upper part of the front of the cavity inside the box 1, and the electrolytic capacitor 8 is located above the buffer contactor 7. The fuse 9 is located at the top of the front of the box 1, and the buffer resistor 10 is located behind the fuse 9.

[0026] The fuse 9, which is used for protection, may be blown during operation. To facilitate the replacement of the fuse 9, a detachable panel 13 is provided on the compartment 1 outside the fuse 9; an L-shaped copper bar 14 is provided at the front end of the fuse 9, and a connecting bolt 15 is provided on the L-shaped copper bar 14 to achieve its connection. The fuse 9 is provided with a fixing bolt 16 to connect the front and rear ends of the fuse 9. When replacing the fuse 9, first remove the detachable panel 13, then unscrew the connecting bolt 15 and the fixing bolt 16, and the fuse 9 can be replaced.

[0027] The box body 1 is also provided with an axial flow fan 17, which takes away the heat generated by the diode rectifier bridge 5, the reactor 4 and other heating devices during operation. The bottom of the box body 1 is provided with a side air intake grille 19 around it, the bottom surface of the box body 1 is the bottom air intake grille 19, the axial flow fan 17 is located above the bottom air intake grille 19, and an inclined guide plate 20 is fixed above the axial flow fan 17, and the inclined guide plate 20 guides the air flow blown out by the axial flow fan 17 to the fin heat sink 6. The top surface of the box body 1 is provided with an upper air outlet grille 21. Driven by the axial flow fan 17, the outside air enters through the side air intake grille 18 and the bottom air intake grille 19, flows from bottom to top in the box body 1, and is finally discharged through the upper air outlet grille 21 to achieve air cooling and heat dissipation of the diode rectifier bridge 5, the reactor 4 and other heaters.

[0028] Two rows of rollers 24 are fixed on the lower surface of the box 1, and a handle 22 and a signal interface 23 are provided on the front panel of the box 1. The rollers 24 and the handle 22 facilitate pushing in and pulling out of the box 1, and the signal interface 23 realizes connection with an external control signal to output the collected signal.

Claims

1. A diode rectifier unit, comprising a housing (1) and a reactor (4), a rectifier module and a fuse module arranged in the housing, the housing being provided with an AC quick-plug male connector (2) and a DC output terminal (3), the rectifier module being composed of a finned heat sink (6) and three diode rectifier bridges (5) fixed on the finned heat sink, and the fuse module being composed of two fuses (9); the input end of the reactor is connected to the AC quick-plug male connector via a copper bar, and the output end of the reactor is connected to the AC input end of the diode rectifier bridge via a copper bar; the DC side negative pole of the diode rectifier bridge is connected to the front end of a fuse via a copper bar, and the rear ends of the two fuses are connected to the DC output terminal; the characteristics are as follows: A buffer module is provided on the DC output side of the rectifier module. The buffer module is composed of a buffer contactor (7) and a buffer resistor (10). The DC side positive pole of the diode rectifier bridge is connected to the input end of the buffer contactor via a copper bar, and the output end of the buffer contactor is connected to the front end of another fuse via a copper bar. A lower buffer charging terminal (11) is connected to the copper bar between the DC side positive pole of the diode rectifier bridge and the input end of the buffer contactor, and an upper buffer charging terminal (12) is connected to the copper bar between the output end of the buffer contactor and the fuse. The lower buffer charging terminal and the upper buffer charging terminal are respectively connected to the two ends of the buffer resistor via cables.

2. The diode rectifier unit according to claim 1, characterized in that: A detachable panel (13) is provided on the box body (1) outside the fusible core (9), an L-shaped copper bar (14) is provided at the front end of the fusible core, a connecting bolt (15) is provided on the L-shaped copper bar, and a fixing bolt (16) for connecting the front end and the rear end of the fusible core is provided on the fusible core.

3. The diode rectifier unit according to claim 1 or 2, characterized in that: The invention comprises a capacitor module composed of a plurality of electrolytic capacitors (8), the two ends of the electrolytic capacitors being connected in parallel with a discharge resistor (25), and the two ends of the plurality of electrolytic capacitors being connected in series being respectively connected to a copper busbar between a DC side negative electrode of a diode rectifier bridge (5) and a fuse core (9) and to a copper busbar between an output end of a buffer contactor (7) and the fuse core.

4. The diode rectifier unit according to claim 3, characterized in that: The reactor (4) is arranged at the middle upper part of the rear of the box (1), the rectifier module is arranged at the lower part of the box, the buffer contactor (7) is arranged at the middle lower part of the front of the box, the buffer contactor is located above the rectifier module, the capacitor module is arranged at the middle upper part of the front of the box, and the capacitor module is located above the buffer contactor; the fuse module is arranged at the top of the front of the box, and the buffer resistor is arranged behind the fuse module.

5. The diode rectifier unit according to claim 1 or 2, characterized in that: The bottom of the box body (1) is provided with side air intake grilles (18) around its periphery, the bottom of the box body is provided with a bottom air intake grille (19), and the top of the box body is provided with an upper air outlet grille (21); a plurality of axial flow fans (17) are provided above the bottom air intake grille, and an inclined guide plate (20) is provided above the axial flow fans for guiding the intake air to the finned heat sink (6).

6. The diode rectifier unit according to claim 1 or 2, characterized in that: A handle (22) and a signal interface (23) are provided on the front panel of the box body (1), and two rows of rollers (24) are fixed on the lower surface of the box body.

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