Advantages Of Laminated Busbars

1. Improve system reliability

Due to the consideration of space size and current-carrying conditions, traditional busbars generally use thick and narrow copper bars, which not only have large resistance, but also cause the system temperature to rise due to poor heat dissipation, and are difficult to process and tedious to install. The use of laminated busbars (as shown in the schematic diagram of the new structure in Figure 5) has a simple and clear structure design, integrated installation, easy assembly and on-site maintenance, improved production and assembly speed and reduced assembly error rate, thereby reducing the labor for assembly of the whole machine. cost; secondly, the structure design has a high degree of integration, which is convenient for product serialization and modularization, and improves product reliability.

2. Low impedance, high capacitance, effectively simplify the IGBT absorption circuit

The thickness of the insulating paper used in the laminated busbar is relatively thin, and the dielectric constant K is relatively high, so the capacitance of the laminated busbar is relatively large, which is equivalent to increasing the system capacitance; in addition, the physical structure characteristics of the laminated busbar It also determines that it has the characteristics of uniform and high distributed capacitance, low series inductance, and low system impedance compared with the traditional busbar, which can effectively simplify the IGBT absorption circuit.

3. Safer to use

Partial discharge refers to the local leakage phenomenon generated inside the insulation, which will cause the rapid aging of the system insulation, which will be a serious safety hazard for high-voltage inverters. The reasons for partial discharge are as follows: one is the high voltage greater than or equal to DC 1kV; the other is the internal insulation between different voltage levels and the air gap between the copper plates. The insulating layer of the laminated busbar and the copper plate are fully bonded after hot pressing with adhesive, without any air gap. 100% partial discharge rate test is carried out before leaving the factory, the insulation life is more than 20 years, and the whole inverter is maintenance-free during the use of the inverter, which solves the hidden safety problems caused by the long-term operation of the inverter.

4. Better cooling effect

The lower impedance characteristics of the laminated busbar can achieve high current carrying capacity with a lower voltage drop, and the higher capacitance stores more thermal energy, so the laminated busbar is easier to dissipate and cool than the traditional busbar, which can Effectively reduce the temperature rise of the system.

In addition, the flat structure of the laminated busbar provides better heat dissipation, and the wide and thin conductors are very beneficial to the flow of air in the system. As the overall size is reduced, the cost of cooling the system is also reduced. Laminated busbars not only make the system more compact, but also improve heat flow through a sleek design.

5. Against harsh environments

Using traditional separate busbars, vibration, salt spray, ice, snow and dust environment will pose a safety threat to the busbar: long-term vibration may cause the disconnection of the separate busbar connections , dust accumulation may lead to creepage breakdown, ice and snow weather may make copper bars wet and dew, resulting in creepage breakdown, etc. With the use of laminated busbars, the high-strength overall bonding ensures long-term non-looseness. Under the same current, the copper busbar can be thinned as much as possible, and the impact of vibration is compensated with elasticity. Threats, these characteristics indicate that the use of laminated busbars can improve the system's ability to withstand harsh environments as a whole.