Vehicle, electric driving system of vehicle, and junction box

Abstract

The invention relates to a vehicle, an electric driving system of the vehicle, and a junction box. The vehicle comprises the electric driving system, and the electric driving system comprises the junction box; the junction box comprises a shell, wherein a filtering magnetic ring is fixed in the shell; and a filtering channel for allowing a filtered circuit to pass through is formed in the center of the filtering magnetic ring. For the whole electric driving system, the filtering structure is arranged inside the junction box with relatively abundant internal space of the electric driving system, and meanwhile, interconnection and filtering of a cable are achieved, so that the energy of an interference signal transmitted on the cable is reduced, the pressure of the cable shielding effectiveness requirement is lowered, and resonance interference caused by system parasitic parameters is weakened. In addition, the mounting space of the filtering structure does not need to be additionally arranged in the electric driving system; and specific to the conditions that the internal structure of the electric driving system is complex, the requirement for the power density is high, the space islimited, and a large-size inductor structure cannot be used, filtering is carried out in a junction box, so that the problem that the power density of the system is lowered due to the fact that the filtering structure occupies the mounting space in the electric driving system is avoided.

Description

technical field [0001] The invention relates to a vehicle, its electric drive system, and a junction box. Background technique [0002] The electric drive system of new energy electric vehicles generally includes power switching devices. In actual use, because the electric drive system has the characteristics of large current and high voltage, the cables connected to the power switching devices often contain rich high-frequency components, resulting in During the transmission process, the cable will emit a large amount of electromagnetic waves, which seriously affect the stability of peripheral equipment and the safety of personnel. In response to this problem, designers use metal mold component casings, shielded connectors and shielded cables in the electric drive system to achieve integrated shielding of the electric drive system. However, in the actual use of this shielding method, because the general The shielding effect of the shielding material on the low-frequency ma...

AI Technical Summary

Problems solved by technology

[0002] The electric drive system of new energy electric vehicles generally includes power switching devices. In actual use, because the electric drive system has the characteristics of large current and high voltage, the cables connected to the power switching devices often contain rich high-frequency components, resulting in During the transmission process, the cable will emit a large amount of electromagnetic waves, which seriously affect the stability of peripheral equipment and the safety of personnel.

In response to this problem, designers use metal mold component casings, shielded connectors and shielded cables in the electric drive system to achieve integrated shielding of the electric drive system. However, in the actual use of this shielding method, because the general The shielding effect of the shielding material on the low-frequency magnetic field emission related to the operating frequency of the power switching device is limited. It is necessary to use expensive high-braid density shielding wires, or even magnetic shielding materials to achieve effective control of the magnetic field emission, which greatly increases the production cost of the shielding structure. Moreover, the shielding effect of this shielding structure on the resonance generated by components and cable parasitic parameters in the high frequency part is not obvious

[0003] To sum up, it is more direct and effective to filter the interference signal inside the electric drive system to reduce its energy. Simple, but restricted by leakage safety, the filtering effect is limited. If inductive filtering is used, although the filtering effect is good, the filtering device is large in size and complicated to fix, and the space for installing the filtering device in the electric drive system is limited.

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