CN-224204967-U - Power unit and frequency converter

CN224204967UCN 224204967 UCN224204967 UCN 224204967UCN-224204967-U

Abstract

The utility model relates to the technical field of frequency converters, in particular to a power unit and a frequency converter, which comprise a control board, a power driving board and a resistance-capacitance board, wherein the control board, the power driving board and the resistance-capacitance board are wrapped in a power unit frame and are connected with each other; the power driving plate and the resistance-capacitance plate are arranged above the control plate, the resistance-capacitance plate is provided with a direct current filter circuit which is connected with the rectifying module and the driving module, and positive and negative buses of the direct current filter circuit are overlapped in the overlooking direction. The power unit among the prior art improves the stray inductance after the device integrates to increase the problem of power device's switching loss, in this scheme, will set up the direct current filter circuit on the power drive board generally and split, set up independent resistance-capacitance board and be used for placing direct current filter circuit, thereby pull open direct current filter circuit for power device's interval, pile up the setting simultaneously on the resistance-capacitance board to positive negative busbar, thereby eliminated the stray inductance, further reduced the switching loss that the stray inductance leads to.

Inventors

LIU SIYU
CHEN XIAOLIN
REN LEILEI
XU HAOBO
Lin Xineng
QI LIANG
WANG XU
CHEN JIANGHONG
LI SHOUFA
CHEN GUANG
KANG XI
CHEN JIAJIA
JIN DEZHI

Assignees

上海电气富士电机电气技术有限公司

Dates

Publication Date: 20260505
Application Date: 20250515

Claims (10)

1. The power unit is characterized by comprising a control board, a power driving board and a resistance-capacitance board which are wrapped in a power unit frame and are connected with each other; The power driving plate and the resistance-capacitance plate are arranged above the control plate, and a power driving circuit is arranged on the power driving plate; The control board is provided with a control circuit corresponding to the power driving circuit; the power driving circuit comprises a rectifying module and a driving module; The direct current filter circuit is arranged on the resistance-capacitance plate, the input end of the direct current filter circuit is connected with the rectifying module, and the output end of the direct current filter circuit is connected with the driving module; Positive and negative buses of the direct current filter circuit are overlapped in the overlooking direction.
2. The power cell of claim 1, wherein the dc filter circuit comprises a plurality of filter capacitors; The filter capacitor is arranged on the upper surface of the resistance-capacitance plate and penetrates through a preset hole on the power unit frame to reach the outside; the pins of the filter capacitor are bent wire rows; the lead row is provided with screw holes, and is fixed on the resistance-capacitance plate through bolts.
3. The power unit of claim 2, wherein an external connector is provided on the power unit frame; the external part extends upwards along the preset hole; the external connector is sleeved on the outer side of the filter capacitor through the anchor ear.
4. The power unit of claim 1, wherein the power drive plate comprises a first power drive plate and a second power drive plate; the first power driving plate and the second power driving plate are arranged in parallel along the long axis direction of the power unit frame; One path of power driving circuit is respectively arranged on the first power driving plate and the second power driving plate; the resistance-capacitance plate comprises a first resistance-capacitance plate and a second resistance-capacitance plate; The first resistance-capacitance plate and the second resistance-capacitance plate are respectively arranged at the outer sides of the first power driving plate and the second power driving plate; one path of direct current filter circuit is respectively arranged on the first resistance-capacitance plate and the second resistance-capacitance plate; The adjacent direct current filter circuits are connected with the power driving circuit through a bridging copper bar; The first power driving plate and the second power driving plate are respectively connected with the control plate below through pins.
5. The power unit of claim 1, wherein the power drive board has an integrally packaged PIM-IGBT device disposed thereon; the power drive circuit is integrated in the PIM-IGBT device; A radiator is welded above the PIM-IGBT device; The heat sink passes through the power unit frame and is exposed to the outside.
6. The power cell of claim 5, wherein the number of PIM-IGBT devices is two; The PIM-IGBT devices are arranged in parallel; The upper parts of the two radiators are fixedly connected with the power unit frame through radiator connecting pieces.
7. The power unit according to claim 1, wherein a plurality of input-output terminals are provided at a side of the power unit frame; The input and output terminals penetrate through the power unit frame and are connected with the power driving plate; the input and output terminals are fixed on the power unit frame through bolts.
8. The power unit according to claim 7, wherein the power unit frame has a fuse fixed on a side surface near the input-output terminal; The fuse is arranged along the height direction of the power unit frame, penetrates through the power unit frame through the copper bars and is connected with the power driving plate.
9. The power cell of claim 2, wherein the power cell frame is provided with openings on a side proximate the filter capacitor.
10. A frequency converter comprising a power unit as claimed in any one of claims 1-9.

Description

Power unit and frequency converter Technical Field The utility model relates to the technical field of frequency converters, in particular to a power unit and a frequency converter. Background The high-voltage frequency converter is power electronic equipment for controlling and regulating a high-voltage alternating current motor, and can realize accurate control of speed regulation, start-stop and running states of the motor. It generally operates at high voltage levels and is suitable for use in high power motor drive systems. The core component of the high-voltage frequency converter is a power unit, which mainly comprises a group of rectifying circuits and a group of motor driving circuits, and can rectify input voltage, and then a specific motor driving signal is output through the motor driving circuits to drive each phase of a motor. To achieve control of the power devices in the motor drive circuit, a set of control boards is usually also provided, which require determining the control mode and necessary parameters such as acceleration, deceleration, motor status, etc. by means of external input signals, and then generating the control signals of the power devices by means of a series of calculation processes. In the prior art, to achieve a more compact device layout, the circuits are usually integrated into a frame structure. For example, chinese patent application CN202411388778.4 discloses an integrated dual H-bridge power unit module, which comprises two three-phase rectifier bridge+h-bridge modules mounted on a radiator to form a dual H-bridge loop, so as to realize dual-module serial output and improve power density, a module adapter plate realizes integrated and modularized design, and improves production efficiency, main loop current terminals are welded around control terminals to reduce interference of the main loop to a driving control loop, bypass power relay meets fault output, a filtering energy storage capacitor is divided into two groups to respectively provide energy storage and filtering for corresponding H-bridge inversion, independent two-path unit input is connected with fast melting through an input cable, a cable sheath is mounted at a via hole of a main housing, and the cable sheath is internally shaped and limited through a cable support member. However, in the practical implementation process, the inventor finds that, as the integration density of the devices is increased, the distance between the devices is close, and the stray inductance is increased, so that the switching loss of the power device is further increased. Disclosure of utility model In view of the above problems in the prior art, a power unit is now provided; On the other hand, a frequency converter applying the power unit is also provided. The specific technical scheme is as follows: A power unit comprises a control board, a power driving board and a resistance-capacitance board which are wrapped in a power unit frame and are connected with each other; The power driving plate and the resistance-capacitance plate are arranged above the control plate, and a power driving circuit is arranged on the power driving plate; The control board is provided with a control circuit corresponding to the power driving circuit; the power driving circuit comprises a rectifying module and a driving module; The direct current filter circuit is arranged on the resistance-capacitance plate, the input end of the direct current filter circuit is connected with the rectifying module, and the output end of the direct current filter circuit is connected with the driving module; Positive and negative buses of the direct current filter circuit are overlapped in the overlooking direction. In another aspect, the dc filter circuit includes a plurality of filter capacitors; The filter capacitor is arranged on the upper surface of the resistance-capacitance plate and penetrates through a preset hole on the power unit frame to reach the outside; the pins of the filter capacitor are bent wire rows; the lead row is provided with screw holes, and is fixed on the resistance-capacitance plate through bolts. On the other hand, an external connector is arranged on the power unit frame; the external part extends upwards along the preset hole; the external connector is sleeved on the outer side of the filter capacitor through the anchor ear. In another aspect, the power driving board includes a first power driving board and a second power driving board; the first power driving plate and the second power driving plate are arranged in parallel along the long axis direction of the power unit frame; One path of power driving circuit is respectively arranged on the first power driving plate and the second power driving plate; the resistance-capacitance plate comprises a first resistance-capacitance plate and a second resistance-capacitance plate; The first resistance-capacitance plate and the second resistance-capacitance plate are respectively arranged a