Modularized converter function rapid verification device

Abstract

The invention discloses a converter function rapid verification device with a modular structure, and relates to the technical field of converter equipment. Comprising a mainboard module, and a DC filtering module, an AC LCL filtering module, a control module, a DC voltage sampling module, a DC current sampling module, an AC current sampling module, an AC voltage sampling module and a half-bridge driving module which are installed on the mainboard module. According to the converter function rapid verification device of the modular structure, through cooperative arrangement of all the modules, all the units can be modularly assembled, the assembling time is shortened, the assembling difficulty is lowered, meanwhile, when damaged elements or new modules need to be replaced, all the modules can be independently disassembled, and the assembling efficiency is improved. The maintenance cost and the disassembly and assembly difficulty of the device are reduced, the small-size centralized design is adopted, and the requirements of easy assembly, easy maintenance and good interface compatibility are met.

Description

Technical Field

[0001] The present invention relates to the technical field of converter equipment, and more particularly to a converter function rapid verification device with a modular structure. Background Art

[0002] A converter is a power electronic device that is used to change the form or shape of electricity. Depending on their functions and applications, converters can be divided into many types, including but not limited to DC-DC converters (DC / DC), DC-AC converters (DC / AC, also known as inverters), AC-DC converters (AC / DC, commonly known as rectifiers), and AC-AC converters (AC / AC). Converters are widely used in industries, transportation, agriculture, household appliances, and other fields.

[0003] The following problems still exist in the use of current converters: when producing converters, all converter components need to be produced, processed and assembled before functional experiments can be performed to verify whether various parameters in the converter meet the design requirements. When a component parameter does not meet the design requirements, the converter needs to be completely disassembled and the defective components replaced, which will increase time costs and reduce efficiency. At the same time, parts are usually fixed to the mainboard by welding. Disassembly is not only laborious, but also easy to cause damage to the mainboard.

[0004] Therefore, it is necessary to propose a modular structure converter function rapid verification device to solve the above problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a converter function rapid verification device with a modular structure to solve the problems raised in the above background technology.

[0006] The technical solution is that the present invention comprises a mainboard module and a DC filter module, an AC LCL filter module, a control module, a DC voltage sampling module, a DC current sampling module, an AC current sampling module, an AC voltage sampling module and a half-bridge driving module installed on the mainboard module;

[0007] The two ends of the mainboard module are connected with a DC terminal, a power supply terminal and an AC terminal, and the DC terminal is sequentially connected to a DC current sampling module, a DC filter module, a half-bridge drive module, an AC LCL filter module and an AC terminal through the mainboard module;

[0008] The signal output ends of the DC voltage sampling module, the DC current sampling module, the AC voltage sampling module and the AC current sampling module are connected to the control module, and the output end of the control module is connected to the DC filtering module, the half-bridge driving module and the AC LCL filtering module.

[0009] Furthermore, an auxiliary power supply module is also installed on the mainboard module, and the auxiliary power supply module supplies power to the control module, the DC current sampling module, the DC voltage sampling module, the AC current sampling module, the AC voltage sampling module, the half-bridge drive module, the DC filter module and the AC filter module through the mainboard module;

[0010] The DC terminal is connected to an external direct current power source, the AC terminal is connected to an external three-phase load, the power supply terminal is connected to an external single-phase alternating current, and the power supply terminal is connected to an auxiliary power supply module.

[0011] Furthermore, the current at the Idc position of the mainboard module enters the DC current sampling module, and the output DC current signal enters the control module. The current at the Iac position on the mainboard module enters the AC current sampling module, and the output three-phase AC signal enters the control module. The voltage at the Uac position on the mainboard module enters the AC voltage sampling module, and the output three-phase AC voltage enters the control module.

[0012] Furthermore, the PWM output end of the control module is connected to the half-bridge driving module through the mainboard module, and outputs a PWM control signal to the half-bridge driving module. The DIO output end of the control module is connected to the DC filtering module and the AC LCL filtering module through the mainboard module, and outputs a DIO control signal to the DC filtering module and the AC LCL filtering module.

[0013] Furthermore, the DC voltage sampling module is connected to the positive and negative poles of the DC terminal, the voltage signal of the DC terminal enters the DC voltage sampling module, the DC current sampling module is connected to the positive pole of the DC terminal, and the AC voltage sampling module is connected to the side of the three-phase line close to the AC terminal.

[0014] Furthermore, the DC filtering module includes an incoming line contactor, a DC soft-start contactor and a DC soft-start resistor, the incoming line contactor is connected in series with the DC soft-start contactor, the DC soft-start contactor is connected in parallel with the DC soft-start resistor, the incoming line contactor is located between the DC current sampling modules of the DC soft-start contactor, the DC bus capacitor is connected to the positive and negative poles of the DC terminal, and the DC bus capacitor is located on the side of the DC soft-start contactor away from the incoming line contactor.

[0015] Furthermore, the half-bridge driving module is three groups of half-bridge power modules connected in parallel, and the three groups of half-bridge power modules are connected in parallel with a DC bus capacitor.

[0016] Furthermore, the AC LCL filter module includes an L1 AC filter module, an L2 AC filter module, an AC soft-start contactor, a DC soft-start resistor and a grid-connected contactor connected to the three-phase line, the grid-connected contactor is connected in series with the AC soft-start contactor, the AC soft-start contactor is connected in parallel with the DC soft-start resistor, the grid-connected contactor is located between the AC soft-start contactor and the AC terminal, the L1 AC filter and the L2 AC filter are located at one end of the AC soft-start contactor away from the grid-connected contactor, and a capacitor is connected between the L1 AC filter module and the L2 AC filter module.

[0017] Furthermore, it also includes connecting terminals, which include busbar terminals and pin bar terminals, the busbar terminals are fixed to the mainboard module, and the pin bar terminals are connected to the auxiliary power supply module, the DC filter module, the AC LCL filter module, the control module, the DC voltage sampling module, the DC current sampling module, the AC current sampling module, the AC voltage sampling module and the half-bridge drive module.

[0018] Furthermore, a protruding support portion is provided at the bottom of the outer wall of the busbar terminal, a pressing plate is connected to the top of the support portion, and both ends of the pressing plate are connected to extrusion disks located on both sides of the busbar terminal, and semi-arc-shaped pressure-receiving portions cooperating with the extrusion disks are provided on both sides of the pin row terminal;

[0019] The internal array of the busbar terminal has a cavity, a contact piece is installed in the cavity, the top of the contact piece is symmetrically connected to a contact plate that can contact the pin row terminal, a reverse plate is connected between adjacent contact plates, one end of the reverse plate is connected to the contact piece, and the other end of the reverse plate is arranged toward the end away from the pin row terminal, and the end portion is against the contact pin of the pin row terminal.

[0020] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0021] 1. This device enables modular assembly of each unit through the coordination of various modules, which shortens the time and difficulty of assembly. At the same time, when damaged components or new modules need to be replaced, each module can be disassembled separately, reducing the maintenance cost and assembly and disassembly difficulty of the device. The small centralized design meets the requirements of easy assembly, easy maintenance and good interface compatibility.

[0022] 2. This device can quickly disassemble the module when replacing it by setting connecting terminals between the mainboard module and various parts, avoiding the situation where the module is difficult to disassemble due to welding. At the same time, the pressing plates and extrusion plates on both sides of the busbar terminal can save effort and avoid the situation where the module is difficult to disassemble due to over-tightening.

[0023] 3. This device can increase the stability of plugging the busbar terminal and the pin row terminal together by arranging a reverse plate on the contact piece, thereby avoiding the situation where the contact pin is separated from the contact piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of each module on the mainboard module of the present invention;

[0025] Figure 2 A schematic diagram of the module positions in the present invention;

[0026] Figure 3 It is a control principle block diagram of the present invention;

[0027] Figure 4 is a schematic diagram of a connecting terminal in the present invention;

[0028] Figure 5 It is a schematic diagram of the busbar terminal and the pin bar terminal connected together in the present invention;

[0029] Figure 6 is a schematic diagram of the contact sheet and reverse plate structure in the present invention;

[0030] Figure 7 It is a schematic diagram of the action of the connecting terminal in the present invention.

[0031] Reference numerals:

[0032] 101. Mainboard module; 102. DC filter module; 103. AC LCL filter module; 104. Control module; 105. DC voltage sampling module; 106. DC current sampling module; 107. AC voltage sampling module; 108. AC current sampling module; 109, AC soft-start contactor; 110, DC terminal; 111, power supply terminal; 112, AC terminal; 113, incoming line contactor; 114, DC soft-start contactor; 115, DC soft-start resistor; 116, half-bridge drive module; 117, L1 AC filter module; 118, L2 AC filter module; 119, grid-connected contactor; 120, auxiliary power supply module; 121, DC bus capacitor; 201, busbar terminal; 202, pin row terminal; 203, support part; 204, pressing plate; 205, extrusion disk; 206, pressure-bearing part; 207, contact piece; 208, contact plate; 209, reverse plate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Depend on Figures 1 to 7 It includes a mainboard module 101 and a DC filter module 102, an AC LCL filter module 103, a control module 104, a DC voltage sampling module 105, a DC current sampling module 106, an AC current sampling module 108, an AC voltage sampling module 107 and a half-bridge driving module 116 installed on the mainboard module 101. Each component is connected through the mainboard module 101. Figure 1 and Figure 4 , the mainboard module 101 and the components are connected via connecting terminals;

[0035] refer to Figure 2 , the two ends of the mainboard module 101 are connected with a DC terminal 110, a power supply terminal 111 and an AC terminal 112, the AC terminal 112 is connected to an external three-phase AC load or a three-phase AC power supply, in some embodiments, the AC voltage of the AC terminal 112 includes 74Vrms or less, the power supply terminal 111 is connected to an external single-phase AC power supply 105, and supplies power to the auxiliary power supply module 120, and the voltage signal of the DC terminal 110 enters the DC voltage sampling module. In some embodiments, the DC voltage of the DC terminal 110 includes 200VDC or less, and the DC terminal 110 is sequentially connected to the DC current sampling module 106, the DC filter module 102, the half-bridge drive module 116, the AC LCL filter module 103 and the AC terminal 112 through the mainboard module 101;

[0036] The signal output ends of the DC voltage sampling module 105, the DC current sampling module 106, the AC voltage sampling module 107 and the AC current sampling module 108 are connected to the control module 104, and the collected data are transmitted to the control module 104. The output end of the control module 104 is connected to the DC filter module 102, the half-bridge drive module 116, and the AC LCL filter module 103. The control module 104 controls the corresponding modules to act according to the collected data.

[0037] Specifically, refer to Figure 1 and Figure 3, an auxiliary power supply module 120 is also installed on the mainboard module 101. The auxiliary power supply module 120 is a power supply end. The auxiliary power supply module 120 provides +5V power to the control module 104, the DC current sampling module 106, the DC voltage sampling module 105, the AC current sampling module 108, and the AC voltage sampling module 107 through the mainboard module 101. The auxiliary power supply module 120 provides +15V power to the half-bridge driver module 116 through the mainboard module 101. The auxiliary power supply module 120 provides +24V power to the DC filter module 102 and the AC filter module through the mainboard module 101;

[0038] The DC terminal 110 is connected to an external DC power supply, and the DC terminal 110 is a DC current input terminal. The AC terminal 112 is connected to an external three-phase load, and the AC terminal 112 is a current output terminal. The power supply terminal 111 is connected to an external single-phase AC power, and the power supply terminal 111 is connected to the auxiliary power supply module 120, and the power supply terminal 111 supplies power to the auxiliary power supply module 120.

[0039] The following provides a specific connection structure of the mainboard module 101: Specifically, the Idc position current of the mainboard module 101 enters the DC current sampling module 106, and the output DC current signal enters the control module 104; the Iac position current on the mainboard module 101 enters the AC current sampling module 108, and the output three-phase AC signal enters the control module 104; the Uac position voltage on the mainboard module 101 enters the AC voltage sampling module 107, and the output three-phase AC voltage enters the control module 104.

[0040] Specifically, the PWM output end of the control module 104 is connected to the half-bridge drive module 116 through the mainboard module 101, and outputs a PWM control signal to the half-bridge drive module 116. The control module 104 transmits the PWM drive signal to the three-way half-bridge drive module 116 of phase A, phase B and phase C through the mainboard module 101. The DIO output end of the control module 104 is connected to the DC filter module 102 and the AC LCL filter module 103 through the mainboard module 101, and outputs a DIO control signal to the DC filter module 102 and the AC LCL filter module 103.

[0041] Specifically, the DC voltage sampling module 105 is connected to the positive and negative poles of the DC terminal 110 to measure the input voltage. The voltage signal of the DC terminal 110 enters the DC voltage sampling module 105 to measure the input current. The DC current sampling module 106 is connected to the positive pole of the DC terminal 110. The AC voltage sampling module 107 is connected to the side of the three-phase line close to the AC terminal 112.

[0042] The following provides a specific structure of the DC filter module 102: Specifically, refer to Figure 2The DC filtering module 102 includes an incoming line contactor 113, a DC soft-start contactor 114 and a DC soft-start resistor 115. The incoming line contactor 113 is connected in series with the DC soft-start contactor 114, and the DC soft-start contactor 114 is connected in parallel with the DC soft-start resistor 115. The incoming line contactor 113 is located between the DC soft-start contactor 114 and the DC current sampling module 106. The DC bus capacitor 121 is connected to the positive and negative poles of the DC terminal 110, and the DC bus capacitor 121 is located on the side of the DC soft-start contactor 114 away from the incoming line contactor 113.

[0043] Specifically, refer to Figure 2 The half-bridge driving module 116 is three groups of half-bridge power modules connected in parallel, and the three groups of half-bridge power modules are connected in parallel with the DC bus capacitor 121, wherein the power switching devices MOS1, MOS2, MOS3, MOS4, MOS5, and MOS6 are field effect transistors (MOSFET) or insulated gate bipolar transistors (IGBT).

[0044] The following provides a specific structure of an AC LCL filter module 103: Specifically, specifically, refer to Figure 2 The AC LCL filter module 103 includes an L1 AC filter module 117, an L2 AC filter module 118, an AC soft-start contactor 109, a DC soft-start resistor 115 and a grid contactor 119 connected to the three-phase line. The grid contactor 119 is connected in series with the AC soft-start contactor 109, and the AC soft-start contactor 109 is connected in parallel with the DC soft-start resistor 115. The grid contactor 119 is located between the AC soft-start contactor 109 and the AC terminal 112. The L1 AC filter and the L2 AC filter are located at one end of the AC soft-start contactor 109 away from the grid contactor 119. The AC filter adopts LCL filtering, and a capacitor is connected between the L1 AC filter module 117 and the L2 AC filter module 118.

[0045] Specifically, specifically, with reference to Figures 4 to 7 , and also includes connecting terminals, which include busbar terminals 201 and pin row terminals 202. The busbar terminals 201 are connected to the main board module 101, and the pin row terminals 202 are connected to various parts. When a part is detected to be damaged, it can be quickly removed to replace the damaged part. The busbar terminals 201 are fixed to the main board module 101, and the pin row terminals 202 are connected to the auxiliary power supply module 120, the DC filter module 102, the AC LCL filter module 103, the control module 104, the DC voltage sampling module 105, the DC current sampling module 106, the AC current sampling module 108, the AC voltage sampling module 107 and the half-bridge drive module 116.

[0046] When the damaged parts need to be replaced, due to the plug-in connection adopted and the small size of the connector, it is easy to be difficult to pull out. The following provides a structure that facilitates the removal of the pin terminal 202 from the bus terminal 201: Specifically, refer to Figure 5 and Figure 7 The outer wall bottom of the busbar terminal 201 is provided with a protruding support portion 203, and the support portion 203 is used to connect the pressing plate 204. The top of the support portion 203 is connected with the pressing plate 204, and the pressing plate 204 is convenient for the user to press with fingers. The two ends of the pressing plate 204 are connected with the squeezing disks 205 located on both sides of the busbar terminal 201. The two sides of the pin row terminal 202 are provided with semi-arc-shaped pressure-receiving portions 206 that cooperate with the squeezing disks 205. The pressure-receiving portions 206 extend downward to both sides of the busbar terminal 201. Figure 7 , press the busbar terminal 201 from both sides of the pressing plate 204, the pressing plate 204 will move the squeezing discs 205 at both ends toward the middle, and the squeezing discs 205 moving toward the middle will squeeze the top pressure receiving part 206 upward, and push the entire pin row terminal 202 upward, so as to facilitate the removal of the pin row terminal 202;

[0047] After the various parts are installed on the mainboard module 101, a stable connection is required to prevent the pin row terminal 202 from being separated from the bus row terminal 201 due to shaking. The following provides a structure to improve the stability of the connection: Figure 6 The internal array of the busbar terminal 201 has a cavity, in which a contact piece 207 is installed. A contact plate 208 that can contact the pin row terminal 202 is symmetrically connected to the top of the contact piece 207. The contact plate 208 is bent to increase the contact area with the contact pin. A reverse plate 209 is connected between adjacent contact plates 208. When the contact pin is inserted, the reverse plate 209 will bend downward and will not affect the contact pin. When the contact pin moves upward, the end of the reverse plate 209 will abut against the contact pin, thereby increasing the stability during connection. One end of the reverse plate 209 is connected to the contact piece 207, and the other end of the reverse plate 209 is set toward the end away from the pin row terminal 202, and the end abuts against the contact pin of the pin row terminal 202.

[0048] When the present invention is in use, a DC filter module 102, an AC LCL filter module 103, a control module 104, a DC voltage sampling module 105, a DC current sampling module 106, an AC voltage sampling module 107, an AC current sampling module 108 and an AC soft-start contactor 109 are provided on the mainboard module 101. When a part is damaged, it can be removed and replaced quickly. At the same time, pressing plates 204 and extrusion disks 205 are provided at both ends of the busbar terminal 201, which can improve the convenience of disassembly, thereby enabling quick disassembly.

[0049] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A modular structured converter function rapid verification device, characterized in that: It comprises a mainboard module (101), a DC filter module (102) installed on the mainboard module (101), an AC LCL filter module (103), a control module (104), a DC voltage sampling module (105), a DC current sampling module (106), an AC current sampling module (108), an AC voltage sampling module (107), and a half-bridge driving module (116); Two ends of the mainboard module (101) are connected with a DC terminal (110), a power supply terminal (111) and an AC terminal (112); the DC terminal (110) is sequentially connected to a DC current sampling module (106), a DC filter module (102), a half-bridge drive module (116), an AC LCL filter module (103) and the AC terminal (112) through the mainboard module (101); The signal output ends of the DC voltage sampling module (105), the DC current sampling module (106), the AC voltage sampling module (107) and the AC current sampling module (108) are connected to the control module (104), and the output end of the control module (104) is connected to the DC filter module (102), the half-bridge drive module (116) and the AC LCL filter module (103).

2. A modular structured converter function rapid verification device according to claim 1, characterized in that: An auxiliary power supply module (120) is also installed on the mainboard module (101), and the auxiliary power supply module (120) supplies power to the control module (104), the DC current sampling module (106), the DC voltage sampling module (105), the AC current sampling module (108), the AC voltage sampling module (107), the half-bridge driving module (116), the DC filter module (102), and the AC filter module through the mainboard module (101); The DC terminal (110) is connected to an external direct current power source, the AC terminal (112) is connected to an external three-phase load, the power supply terminal (111) is connected to an external single-phase alternating current, and the power supply terminal (111) is connected to an auxiliary power supply module (120).

3. A modular structured converter function rapid verification device according to claim 2, characterized in that: The current at the Idc position of the mainboard module (101) enters a direct current sampling module (106), and outputs a direct current signal that enters a control module (104); the current at the Iac position on the mainboard module (101) enters an alternating current sampling module (108), and outputs a three-phase alternating current signal that enters a control module (104); the voltage at the Uac position on the mainboard module (101) enters an alternating current voltage sampling module (107), and outputs a three-phase alternating current voltage that enters a control module (104).

4. A modular structured converter function rapid verification device according to claim 3, characterized in that: The PWM output end of the control module (104) is connected to the half-bridge driving module (116) through the mainboard module (101), and outputs a PWM control signal to the half-bridge driving module (116); the DIO output end of the control module (104) is connected to the DC filter module (102) and the AC LCL filter module (103) through the mainboard module (101), and outputs a DIO control signal to the DC filter module (102) and the AC LCL filter module (103).

5. A modular structured converter function rapid verification device according to claim 4, characterized in that: The DC voltage sampling module (105) is connected to the positive and negative poles of the DC terminal (110), the voltage signal of the DC terminal (110) enters the DC voltage sampling module (105), the DC current sampling module (106) is connected to the positive pole of the DC terminal (110), and the AC voltage sampling module (107) is connected to the side of the three-phase line close to the AC terminal (112).

6. A modular structured converter function rapid verification device according to claim 5, characterized in that: The DC filter module (102) comprises an incoming line contactor (113), a DC soft-start contactor (114) and a DC soft-start resistor (115); the incoming line contactor (113) is connected in series with the DC soft-start contactor (114); the DC soft-start contactor (114) and the DC soft-start resistor (115) are connected in parallel; the incoming line contactor (113) is located between the DC soft-start contactor (114) and the DC current sampling module (106); the DC bus capacitor (121) is connected to the positive and negative electrodes of the DC terminal (110); and the DC bus capacitor (121) is located on a side of the DC soft-start contactor (114) away from the incoming line contactor (113).

7. A modular structured converter function rapid verification device according to claim 6, characterized in that: The half-bridge driving module (116) is three groups of half-bridge power modules connected in parallel, and the three groups of half-bridge power modules are connected in parallel with a DC bus capacitor (121).

8. The modular structured converter function rapid verification device according to claim 7, characterized in that: The AC LCL filter module (103) comprises an L1 AC filter module (117) connected to a three-phase line, an L2 AC filter module (118), an AC soft-start contactor (109), a DC soft-start resistor (115) and a grid-connected contactor (119); the grid-connected contactor (119) is connected in series with the AC soft-start contactor (109); the AC soft-start contactor (109) is connected in parallel with the DC soft-start resistor (115); the grid-connected contactor (119) is located between the AC soft-start contactor (109) and an AC terminal (112); the L1 AC filter and the L2 AC filter are located at one end of the AC soft-start contactor (109) away from the grid-connected contactor (119); and a capacitor is connected between the L1 AC filter module (117) and the L2 AC filter module (118).

9. A modular structured converter function rapid verification device according to claim 8, characterized in that: The invention also comprises connecting terminals, wherein the connecting terminals comprise busbar terminals (201) and pin-row terminals (202), wherein the busbar terminals (201) are fixed to the mainboard module (101), and the pin-row terminals (202) are connected to the auxiliary power supply module (120), the DC filter module (102), the AC LCL filter module (103), the control module (104), the DC voltage sampling module (105), the DC current sampling module (106), the AC current sampling module (108), the AC voltage sampling module (107), and the half-bridge drive module (116).

10. A modular structured converter function rapid verification device according to claim 9, characterized in that: The outer wall bottom of the busbar terminal (201) is provided with a protruding support portion (203), the top of the support portion (203) is connected to a pressing plate (204), both ends of the pressing plate (204) are connected to extrusion disks (205) located on both sides of the busbar terminal (201), and both sides of the pin row terminal (202) are provided with semi-arc-shaped pressure receiving portions (206) that cooperate with the extrusion disk (205); The internal array of the busbar terminal (201) has a cavity, a contact piece (207) is installed in the cavity, and a contact plate (208) capable of contacting the pin-row terminal (202) is symmetrically connected to the top of the contact piece (207), and a reverse plate (209) is connected between adjacent contact plates (208), one end of the reverse plate (209) is connected to the contact piece (207), and the other end of the reverse plate (209) is arranged toward an end away from the pin-row terminal (202), and the end portion is against the contact pin of the pin-row terminal (202).

Images