Expandable AC / DC dual-power permanent magnet motor frequency converter

Abstract

An expandable AC-DC dual-power permanent magnet motor frequency converter adopts the combination of a frequency converter body and a DC power supply expansion module. The frequency converter body is provided with a DC plugging terminal insertion port and a DC switch control line plugging terminal inlet. The direct current power supply expansion module is composed of a direct current power supply terminal, a direct current plugging terminal, a direct current switch and a direct current switch control line plugging terminal. The direct current plugging terminal insertion port is in butt joint with the direct current plugging terminal; the direct-current switch control line plugging terminal inlet is in butt joint with the direct-current switch control line plugging terminal; the direct-current plugging terminal is connected to the direct-current switch through an electric power circuit, and the other end of the direct-current switch is connected to a direct-current power supply terminal through an electric power circuit; the DC switch control line plugging terminal is connected to a control loop of the two DC switches through a communication cable. The frequency converter body is composed of an alternating current rectification module, an expandable bus, an inversion module and a control module. The expandable bus is composed of a rectification terminal, a direct current bus, an inversion terminal and an expandable terminal.

Description

Technical Field

[0001] This utility model relates to an expandable AC / DC dual-power permanent magnet motor frequency converter, belonging to the field of motor speed control equipment. Background Technology

[0002] With the maturation of rare earth permanent magnet materials in my country, AC permanent magnet synchronous motors have become more competitive in the market. Their high efficiency and energy-saving characteristics make them an excellent power source for industrial machinery. However, permanent magnet motors must be driven by vector frequency converters, so frequency converters are always configured for permanent magnet motors in engineering applications. Meanwhile, in large factories, some important oil pumps and fire pumps are equipped with DC motors as backups to prevent system power outages. This equipment redundancy increases project investment, and the direct starting current of DC motors has a significant impact on the DC power supply system, thus reducing system reliability. Traditional AC frequency converters can only use one AC voltage. If an additional DC power supply is added to power the frequency converter, the permanent magnet motor drive system can cope with power failures and continuously provide power to the permanent magnet motor and mechanical equipment. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides an expandable modular combination device for optical energy storage and charging. It employs an expandable structure for the inverter body and inserts an external DC power supply expansion module to provide power to the inverter.

[0004] An expandable AC / DC dual-power permanent magnet motor frequency converter, which combines the frequency converter body and the DC power supply expansion module;

[0005] The inverter body has a DC plug-in terminal insertion port and a DC switch control line plug-in terminal inlet;

[0006] The DC power supply expansion module consists of DC power supply terminals, DC plug-in terminals, a DC switch, and DC switch control line plug-in terminals;

[0007] The DC plug-in terminal is connected to the DC plug-in terminal;

[0008] The DC switch control line plug-in terminal is connected to the DC switch control line plug-in terminal insertion port;

[0009] The DC plug-in terminal is connected to the DC switch via a power line, and the other end of the DC switch is connected to the DC power supply terminal via a power line.

[0010] There are two DC power supply terminals, two DC plug-in terminals, and two DC switches, one on the positive circuit and one on the negative circuit.

[0011] The DC switch control line plug-in terminal is connected to the control circuit of the two DC switches via a communication cable;

[0012] The inverter body consists of an AC rectifier module, an expandable bus, an inverter module, and a control module;

[0013] The expandable busbar consists of rectifier terminals, DC busbar, inverter terminals and expandable terminals;

[0014] The DC switch control line plug-in terminal is connected to the control module;

[0015] The DC plug-in terminal is divided into positive and negative terminals, and the two DC plug-in terminal ports are respectively connected to the expandable terminal of the expandable bus via power lines.

[0016] The rectifier terminal, the inverter terminal, and the expandable terminal are all connected to the DC bus;

[0017] The DC side of the AC rectifier module is connected to the rectifier terminal of the expandable bus; the DC side of the inverter module is connected to the inverter terminal of the expandable bus.

[0018] The control module is connected to the AC rectifier module and the inverter module via communication. The control module identifies the power supply status of the AC rectifier module, controls the DC power supply extension module to close the DC switch to supply power, and then controls the inverter module to invert and adjust the frequency.

[0019] Preferably, the DC switch is a power electronic switch.

[0020] This invention employs an expandable structure for the inverter body, allowing for the insertion of an external DC power supply expansion module. This design offers flexibility and convenience, making it suitable for various scenarios and facilitating engineering applications. In the event of an AC power failure, the inverter is powered by a DC power supply, ensuring continuous motor rotation. Attached Figure Description

[0021] Figure 1 Inverter topology diagram.

[0022] Figure 2 Expandable bus topology.

[0023] Figure 3 Inverter body structure diagram; where 11 is AC power terminal, 12 is motor power terminal, 13 is DC plug-in terminal insertion port, and 14 is DC switch control line plug-in terminal entry port.

[0024] Figure 4 DC power supply expansion module structure diagram; where 21 is the DC power supply terminal, 22 is the DC plug-in terminal, and 23 is the DC switch control line plug-in terminal.

[0025] Figure 5 Overall structure diagram of the frequency converter.

[0026] Figure 6 Inverter circuit diagram; where 1 is AC rectifier module, 2 is expandable bus, 3 is inverter module, 4 is control module, and 5 is DC power supply expansion module. Detailed Implementation

[0027] like Figure 1 As shown, the expandable AC / DC dual-power permanent magnet motor frequency converter adopts a combination of frequency converter body and DC power supply expansion module; the frequency converter body consists of AC rectifier module, expandable bus, inverter module and control module.

[0028] like Figure 2 As shown, the expandable bus consists of rectifier terminals, a DC bus, inverter terminals, and expandable terminals. The rectifier terminals, inverter terminals, and expandable terminals are all connected to the DC bus.

[0029] like Figure 3 As shown, the inverter body has an AC power terminal 11, a motor power terminal 12, a DC plug-in terminal 13, and a DC switch control line plug-in terminal 14. The AC power terminal 11 is used to connect to an AC power source, and the motor power terminal 12 is used to connect to the driven motor.

[0030] like Figure 4 As shown, the DC power supply expansion module consists of a DC power supply terminal 21, a DC plug-in terminal 22, a DC switch, and a DC switch control line plug-in terminal 23. The DC switch is a power electronic switch, and its response time, voltage level, and rated current must match the electrical and control parameters of the frequency converter. The DC power supply terminal 21 is used to connect the DC power supply.

[0031] like Figure 5 As shown, the DC plug-in terminal 13 is connected to the DC plug-in terminal 22; the DC switch control line plug-in terminal 14 is connected to the DC switch control line plug-in terminal 23.

[0032] like Figure 6 As shown, the DC plug-in terminal 22 of the DC power supply expansion module 5 is connected to the DC switch via a power line, and the other end of the DC switch is connected to the DC power supply terminal 21 via a power line; there are two DC power supply terminals 21, two DC plug-in terminals 22, and two DC switches, which are respectively on the positive circuit and the negative circuit.

[0033] The DC plug-in terminal 13 is divided into positive and negative terminals, and the two DC plug-in terminal 13 are connected to the expandable terminal of the expandable bus 2 through power lines.

[0034] The DC side of AC rectifier module 1 is connected to the rectifier terminal of expandable bus 2; the DC side of inverter module 3 is connected to the inverter terminal of expandable bus 2.

[0035] The DC switch control line plug-in terminal 23 is connected to the control circuit of the two DC switches via a communication cable; the DC switch control line plug-in terminal insertion port 14 is connected to the control module 4. The control module 4 is connected to the AC rectifier module 1 and the inverter module 3 via communication; the control module 4 identifies the power supply status of the AC rectifier module 1, controls the DC power supply expansion module 5 to close the control DC switch to supply power, and then controls the inverter module 3 to invert and frequency adjust.

[0036] During normal operation, AC power supply is used. AC rectifier module 1 converts the three-phase AC to DC through full-wave rectification. The DC enters inverter module 3 after passing through the filter circuit on expandable bus 2. Control module 4 calculates the output voltage, the conduction angle of each thyristor, and the sequence of thyristor turn-on trigger pulse commands based on the frequency value in the received frequency conversion command. Finally, inverter module 3 inverts and outputs the frequency-converted three-phase AC. When control module 4 detects that the AC power supply voltage of AC rectifier module 1 and the voltage of expandable bus 2 are lower than a certain value, control module 4 controls the DC switch to close, and DC power is supplied. Once the voltage of expandable bus 2 returns to normal, it immediately controls inverter module 3 to start inverting, performing frequency and voltage regulation.

[0037] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An expandable AC / DC dual-power permanent magnet motor frequency converter, characterized in that, It adopts a combination of frequency converter body and DC power supply expansion module; The inverter body has a DC plug-in terminal insertion port and a DC switch control line plug-in terminal inlet; The DC power supply expansion module consists of DC power supply terminals, DC plug-in terminals, a DC switch, and DC switch control line plug-in terminals; The DC plug-in terminal insertion port is connected to the DC plug-in terminal; The DC switch control line plug-in terminal inlet is connected to the DC switch control line plug-in terminal; The DC plug-in terminal is connected to the DC switch via a power line, and the other end of the DC switch is connected to the DC power supply terminal via a power line. There are two DC power supply terminals, two DC plug-in terminals, and two DC switches, one on the positive circuit and one on the negative circuit. The DC switch control line plug-in terminal is connected to the control circuit of the two DC switches via a communication cable; The inverter body consists of an AC rectifier module, an expandable bus, an inverter module, and a control module; The expandable busbar consists of rectifier terminals, DC busbar, inverter terminals and expandable terminals; The DC switch control line plug-in terminal is connected to the control module; The DC plug-in terminal is divided into positive and negative terminals, and the two DC plug-in terminal ports are respectively connected to the expandable terminal of the expandable bus via power lines.

2. The expandable AC / DC dual-power permanent magnet motor frequency converter according to claim 1, characterized in that, The rectifier terminal, the inverter terminal, and the expandable terminal are all connected to the DC bus; The DC side of the AC rectifier module is connected to the rectifier terminal of the expandable bus. The DC side of the inverter module is connected to the inverter terminal of the expandable bus.

3. The expandable AC / DC dual-power permanent magnet motor frequency converter according to claim 1, characterized in that, The control module is connected to the AC rectifier module and the inverter module via communication; the control module identifies the power supply status of the AC rectifier module, controls the DC switch of the DC power supply expansion module to close to supply power, and then controls the inverter module to invert and regulate the frequency.

4. The expandable AC / DC dual-power permanent magnet motor frequency converter according to claim 1, characterized in that, Preferably, the DC switch is a power electronic switch.

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