A serial half-bridge SCR frequency conversion power supply installation cabinet

Abstract

This utility model relates to a power supply installation cabinet, specifically a series half-bridge SCR frequency converter installation cabinet. It includes a cabinet body, with a first, second, third, and fourth unit containing an input assembly, a rectifier filter assembly, a resonant capacitor assembly, and an inverter output assembly, sequentially connected to form a series half-bridge SCR frequency converter circuit. The input terminal of the input assembly is connected to a three-phase power supply, and the output terminal of the inverter output assembly is connected to the load. A water inlet distributor and a return water collector are located on the side of the cabinet. Water-cooled plates are installed in both the second and fourth units, with the water inlet of the water-cooled plate connected to the outlet of the water inlet distributor, and the water outlet of the water-cooled plate connected to the inlet of the return water collector. This utility model reduces the distributed inductance and stray inductance caused by distributed installation through an integrated installation method, thus reducing the probability of damage due to insufficient commutation time.

Description

Technical Field

[0001] This utility model relates to a power supply installation cabinet, specifically a series half-bridge SCR frequency converter power supply installation cabinet. Background Technology

[0002] Traditional resonant power supply cabinets adopt a distributed installation method, which specifically involves setting up a power supply (input line-rectifier-inverter) cabinet and a capacitor cabinet (or capacitor rack); this installation method makes it difficult to control the transmission inductance between the two.

[0003] Moreover, in traditional resonant power supply cabinets, SCR devices are assembled separately inside the cabinet. This layout is not only messy and takes up a lot of space, but also generates distributed inductance and stray inductance in the circuit. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of traditional resonant power supply cabinets, such as messy component layout, large space occupation, and easy generation of circuit distributed inductance and stray inductance, and to provide a series half-bridge SCR frequency converter power supply installation cabinet.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A series half-bridge SCR frequency converter power supply installation cabinet includes a cabinet body, the interior of which is divided into a first unit, a second unit, a third unit and a fourth unit by multiple partitions.

[0007] The first unit, the second unit, the third unit, and the fourth unit are respectively equipped with an input line assembly, a rectifier and filter assembly, a resonant capacitor assembly, and an inverter output assembly;

[0008] The input component, rectifier filter component, resonant capacitor component, and inverter output component are connected in sequence to form a series half-bridge SCR frequency converter power supply circuit; the input terminal of the input component is connected to the three-phase power supply, and the output terminal of the inverter output component is connected to the load.

[0009] The side of the cabinet is equipped with a water inlet distributor and a water return collector. Water-cooled plates are installed in both the second and fourth units. The water inlet of the water-cooled plate is connected to the water outlet of the water inlet distributor, and the water outlet of the water-cooled plate is connected to the water inlet of the water return collector.

[0010] Furthermore, the incoming line assembly includes a three-phase isolation transformer, an incoming line inductor, a molded case circuit breaker, and a filter reactor installed in the first unit;

[0011] The three-phase isolation transformer, the incoming line inductor, and the molded case circuit breaker are connected in sequence, and the input terminal of the three-phase isolation transformer is connected to the three-phase power supply.

[0012] The output terminal of the molded case circuit breaker, the filter reactor, and the rectifier filter assembly are connected.

[0013] Furthermore, the rectifier and filter assembly includes an isolation diode, a filter capacitor, and six SCR rectifiers installed in the second unit;

[0014] Six SCR rectifiers are installed in the second unit via a combined tube rack;

[0015] Each of the six SCR rectifiers is divided into three upper SCR rectifier elements and three lower SCR rectifier elements; the anode of the upper SCR rectifier element is connected to the cathode of the lower SCR rectifier element to form a bridge arm, and the midpoint of the bridge arm is connected to the output terminal of the molded case circuit breaker through a fast-acting fuse.

[0016] The anodes of the three upper SCR rectifier elements are connected to form a common anode, and the cathodes of the three lower SCR rectifier elements are connected to form a common cathode;

[0017] The common anode is connected to the input terminal of the filter reactor, and the output terminal of the filter reactor is connected to the anode of the isolation diode; the filter capacitor is connected across the cathode of the isolation diode and the common cathode.

[0018] The resonant capacitor assembly is connected across the two ends of the filter capacitor.

[0019] Furthermore, the resonant capacitor assembly includes a plurality of resonant capacitors mounted in the third unit via mounting brackets;

[0020] The multiple resonant capacitors are divided into two groups. The multiple resonant capacitors in one group are connected in series to form the upper resonant capacitor, and the multiple resonant capacitors in the other group are connected in series to form the lower resonant capacitor.

[0021] The capacitance value of the upper resonant capacitor is the same as that of the lower resonant capacitor;

[0022] The upper and lower resonant capacitors are connected in series and then bridged across the two ends of the filter capacitor; the inverter output component is connected to the upper and lower resonant capacitors.

[0023] Furthermore, the inverter output component includes an upper SCR half-bridge inverter circuit and a lower SCR half-bridge inverter circuit installed in the fourth unit;

[0024] The connection point between the upper and lower resonant capacitors is connected to one end of the load.

[0025] One end of the upper SCR half-bridge inverter circuit is connected to the end of the upper resonant capacitor that is furthest from the lower resonant capacitor, and the other end of the upper SCR half-bridge inverter circuit is connected to the other end of the load.

[0026] One end of the lower SCR half-bridge inverter circuit is connected to the end of the lower resonant capacitor that is furthest from the upper resonant capacitor, and the other end of the lower SCR half-bridge inverter circuit is connected to the other end of the load.

[0027] Furthermore, the three-phase isolation transformer, molded case circuit breaker, incoming line inductor and filter reactor are arranged sequentially from top to bottom in the first unit.

[0028] Furthermore, the SCR rectifier, fast-acting fuse, isolation diode, and filter capacitor are arranged sequentially from top to bottom within the second unit.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] 1. The series half-bridge SCR frequency converter power supply mounting cabinet provided by this utility model adopts an integrated mounting cabinet, which eliminates the transmission inductance between the power supply cabinet and the capacitor cabinet, and avoids the problem of additional power loss and heating of surrounding steel components caused by transmission inductance. The rectifier filter component and the inverter output component are installed in the second unit and the fourth unit respectively. The integrated installation method can reduce the distributed inductance and stray inductance caused by distributed installation, thereby reducing the probability of damage to power semiconductor devices due to insufficient commutation time caused by distributed inductance and stray inductance.

[0031] 2. The series half-bridge SCR inverter power supply installation cabinet provided by this utility model has water-cooled plates installed in the second and fourth units of the cabinet. The water-cooled plates are connected to the inlet water distributor and the return water collector. In use, the cooling medium circulation system is connected to the inlet water distributor and the return water collector to achieve heat exchange and cooling of the temperature generated by each component in the second and fourth units during operation, so as to ensure the normal tooling of the series half-bridge SCR inverter power supply circuit. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the structure of the first unit in an embodiment of the present utility model;

[0035] Figure 4 This is a schematic diagram of the structure of the second unit in an embodiment of this utility model.

[0036] Explanation of reference numerals in the attached diagram: 1-Cabinet, 2-Partition, 3-First unit, 4-Second unit, 5-Third unit, 6-Fourth unit, 7-Inlet water distributor, 8-Return water collector, 9-Three-phase isolation transformer, 10-Inlet inductor, 11-Molded case circuit breaker, 12-Filter reactor, 13-Isolation diode, 14-Filter capacitor, 15-SCR rectifier, 16-Combined pipe rack, 17-Fast-acting fuse, 18-Resonant capacitor, 19-Upper SCR half-bridge inverter circuit, 20-Lower SCR half-bridge inverter circuit. Detailed Implementation

[0037] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] like Figure 1 and Figure 2 As shown, a series half-bridge SCR frequency converter power supply installation cabinet includes a cabinet 1. The cabinet 1 is divided into a first unit 3, a second unit 4, a third unit 5 and a fourth unit 6 by multiple partitions 2. The first unit 3, the second unit 4, the third unit 5 and the fourth unit 6 are respectively provided with an input line assembly, a rectifier filter assembly, a resonant capacitor assembly and an inverter output assembly.

[0039] The input line assembly, rectifier filter assembly, resonant capacitor assembly, and inverter output assembly are connected in sequence to form a series half-bridge SCR frequency converter power supply circuit; the input terminal of the input line assembly is connected to the three-phase power supply, and the output terminal of the inverter output assembly is connected to the load.

[0040] The side of the cabinet 1 is equipped with a water inlet distributor 7 and a water return collector 8. The water inlet distributor 7 is connected to the cooling medium circulation system of the water return collector 8, and the cooling medium circulation system provides cooling medium for the water-cooled plate. The second unit 4 and the fourth unit 6 are both equipped with water-cooled plates. The water inlet of the water-cooled plate is connected to the water outlet of the water inlet distributor 7, and the water outlet of the water-cooled plate is connected to the water inlet of the water return collector 8.

[0041] like Figure 1 and Figure 2 As shown, the incoming line assembly includes a three-phase isolation transformer 9, an incoming line inductor 10, a molded case circuit breaker 11, and a filter reactor 12, all installed within the first unit 3; Figure 3 As shown, the three-phase isolation transformer 9, the molded case circuit breaker 11, the incoming line inductor 10 and the filter reactor 12 are arranged in the first unit 3 from top to bottom;

[0042] The three-phase isolation transformer 9, the incoming line inductor 10, and the molded case circuit breaker 11 are connected in sequence, and the input terminal of the three-phase isolation transformer 9 is connected to the three-phase power supply; the output terminal of the molded case circuit breaker 11 and the filter reactor 12 are connected to the rectifier and filter assembly.

[0043] like Figure 1 and Figure 2 As shown, the rectifier and filter assembly includes an isolation diode 13, a filter capacitor 14, and six SCR rectifiers 15 installed in the second unit 4; as Figure 4 As shown, the SCR rectifier 15, fast fuse 17, isolation diode 13 and filter capacitor 14 are arranged in the second unit 4 from top to bottom;

[0044] Six SCR rectifiers 15 are installed in the second unit 4 via a combined pipe rack 16; each of the six SCR rectifiers 15 is divided into three upper SCR rectifier elements and three lower SCR rectifier elements; the anode of the upper SCR rectifier element is connected to the cathode of the lower SCR rectifier element to form a bridge arm, and the midpoint of the bridge arm is connected to the output terminal of the molded case circuit breaker 11 via a fast-acting fuse 17.

[0045] The anodes of the three upper SCR rectifier elements are connected to form a common anode, and the cathodes of the three lower SCR rectifier elements are connected to form a common cathode;

[0046] The common anode is connected to the input terminal of the filter reactor 12, and the output terminal of the filter reactor 12 is connected to the anode of the isolation diode 13; the filter capacitor 14 is connected across the cathode of the isolation diode 13 and the common cathode.

[0047] The resonant capacitor assembly is connected across the two ends of the filter capacitor 14.

[0048] like Figure 1 and Figure 2 As shown, the resonant capacitor assembly includes multiple resonant capacitors 18 mounted in the third unit 5 via mounting brackets; the multiple resonant capacitors 18 are divided into two groups, one group of multiple resonant capacitors 18 connected in series to form an upper resonant capacitor, and the other group of multiple resonant capacitors 18 connected in series to form a lower resonant capacitor; the capacitance value of the upper resonant capacitor is the same as that of the lower resonant capacitor.

[0049] The upper and lower resonant capacitors are connected in series and then spanned across the two ends of the filter capacitor 14; the inverter output component is connected to the upper and lower resonant capacitors.

[0050] like Figure 1 and Figure 2 As shown, the inverter output component includes an upper SCR half-bridge inverter circuit 19 and a lower SCR half-bridge inverter circuit 20 installed in the fourth unit 6; the connection between the upper resonant capacitor and the lower resonant capacitor is connected to one end of the load.

[0051] One end of the upper SCR half-bridge inverter circuit 19 is connected to the end of the upper resonant capacitor that is furthest from the lower resonant capacitor, and the other end of the upper SCR half-bridge inverter circuit 19 is connected to the other end of the load.

[0052] One end of the lower SCR half-bridge inverter circuit 20 is connected to the end of the lower resonant capacitor that is furthest from the upper resonant capacitor, and the other end of the lower SCR half-bridge inverter circuit 20 is connected to the other end of the load.

[0053] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A series half-bridge SCR variable frequency power supply installation cabinet, characterized in that, It includes a cabinet (1), and the interior of the cabinet (1) is divided into a first unit (3), a second unit (4), a third unit (5) and a fourth unit (6) by multiple partitions (2); The first unit (3), the second unit (4), the third unit (5) and the fourth unit (6) are respectively equipped with an input line assembly, a rectifier filter assembly, a resonant capacitor assembly and an inverter output assembly; The input component, rectifier filter component, resonant capacitor component, and inverter output component are connected in sequence to form a series half-bridge SCR frequency converter power supply circuit; the input terminal of the input component is connected to the three-phase power supply, and the output terminal of the inverter output component is connected to the load. The side of the cabinet (1) is provided with a water inlet distributor (7) and a water return collector (8). The second unit (4) and the fourth unit (6) are both provided with water-cooled plates. The water inlet of the water-cooled plate is connected to the water outlet of the water inlet distributor (7), and the water outlet of the water-cooled plate is connected to the water inlet of the water return collector (8).

2. The series half-bridge SCR frequency converter power supply installation cabinet according to claim 1, characterized in that, The incoming line assembly includes a three-phase isolation transformer (9), an incoming line inductor (10), a molded case circuit breaker (11), and a filter reactor (12) installed in the first unit (3); The three-phase isolation transformer (9), the incoming line inductor (10) and the molded case circuit breaker (11) are connected in sequence, and the input terminal of the three-phase isolation transformer (9) is connected to the three-phase power supply. The output terminal of the molded case circuit breaker (11) and the filter reactor (12) are connected to the rectifier filter assembly.

3. The series half bridge SCR variable frequency power supply installation cabinet according to claim 2, characterized in that, The rectifier and filter assembly includes an isolation diode (13), a filter capacitor (14), and six SCR rectifiers (15) installed in the second unit (4); Six SCR rectifiers (15) are installed in the second unit (4) via a combined tube rack (16); The six SCR rectifiers (15) are divided into three upper SCR rectifier elements and three lower SCR rectifier elements. The anode of the upper SCR rectifier element is connected to the cathode of the lower SCR rectifier element to form a bridge arm. The midpoint of the bridge arm is connected to the output terminal of the molded case circuit breaker (11) through a fast fuse (17). The anodes of the three upper SCR rectifier elements are connected to form a common anode, and the cathodes of the three lower SCR rectifier elements are connected to form a common cathode; The common anode is connected to the input terminal of the filter reactor (12), and the output terminal of the filter reactor (12) is connected to the anode of the isolation diode (13); the filter capacitor (14) is connected across the cathode of the isolation diode (13) and the common cathode. The resonant capacitor assembly is connected across the two ends of the filter capacitor (14).

4. The series half bridge SCR variable frequency power supply installation cabinet according to claim 3, characterized in that, The resonant capacitor assembly includes multiple resonant capacitors (18) mounted in the third unit (5) via mounting brackets; Multiple resonant capacitors (18) are divided into two groups. In one group, multiple resonant capacitors (18) are connected in series to form an upper resonant capacitor, and in the other group, multiple resonant capacitors (18) are connected in series to form a lower resonant capacitor. The capacitance value of the upper resonant capacitor is the same as that of the lower resonant capacitor; The upper resonant capacitor and the lower resonant capacitor are connected in series and then connected across the two ends of the filter capacitor (14); the inverter output component is connected to the upper resonant capacitor and the lower resonant capacitor.

5. The series half bridge SCR variable frequency power supply installation cabinet according to claim 4, characterized in that, The inverter output component includes an upper SCR half-bridge inverter circuit (19) and a lower SCR half-bridge inverter circuit (20) installed in the fourth unit (6); The connection point between the upper and lower resonant capacitors is connected to one end of the load. One end of the upper SCR half-bridge inverter circuit (19) is connected to the end of the upper resonant capacitor that is far away from the lower resonant capacitor, and the other end of the upper SCR half-bridge inverter circuit (19) is connected to the other end of the load. One end of the lower SCR half-bridge inverter circuit (20) is connected to the end of the lower resonant capacitor that is far away from the upper resonant capacitor, and the other end of the lower SCR half-bridge inverter circuit (20) is connected to the other end of the load.

6. The series half-bridge SCR frequency converter power supply installation cabinet according to claim 2, characterized in that, The three-phase isolation transformer (9), molded case circuit breaker (11), incoming line inductor (10) and filter reactor (12) are arranged in the first unit (3) from top to bottom.

7. The series half bridge SCR variable frequency power supply mounting cabinet according to claim 3, characterized in that, The SCR rectifier (15), fast fuse (17), isolation diode (13) and filter capacitor (14) are arranged in the second unit (4) from top to bottom.

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