Synchronous rectification device for water-cooled laminated busbars suitable for high current transmission

Abstract

The invention discloses a water-cooling layer bus bar suitable for large-current transmission and a synchronous rectifying device. The bus bar comprises two conductive substrates and a PCB, wherein a front copper coating layer and a back copper coating layer are arranged on the front side and back side of the PCB respectively and are insulated from each other, both the front copper coating layer and the back copper coating layer are located in a copper coating area, the PCB is provided with a bonding pad set located in the welding area and comprises a first polarity bonding pad electrically connected with the front copper coating layer and a second polarity bonding pad electrically connected with the back copper coating layer, the two conductive substrates and the PCB are arranged in an alternately stacked mode, the two conductive substrates are in close contact with the front copper coating layer and the back copper coating layer of the PCB respectively to achieve electric connection, each conductive substrate is provided with a cooling liquid passing hole, and a water inlet and a water outlet of each cooling liquid passing hole are formed in the surface, not in contact with the PCB, of the corresponding conductive substrate. The bus bar has the advantages of being compact in structure, high in cooling efficiency, high in current carrying capacity, low in inductance, low in impedance, and high in reliability.

Description

technical field [0001] The invention relates to a water-cooled laminated bus bar suitable for large current transmission, and also relates to a synchronous rectification device using the bus bar. Background technique [0002] In the power electronics industry, low voltage and high current have become the mainstream trend. In the case of low voltage and high current output, a large voltage drop will directly lead to an increase in rectification loss and a decrease in power supply efficiency. Synchronous rectification uses a special power device MOS tube with extremely low on-state resistance to replace the rectifier diode, which greatly reduces the rectification loss at the output end of the switching power supply, thereby improving the efficiency of the power supply, reducing the heat generation of the power supply itself, and meeting the high efficiency requirements of low-voltage and high-current switching power supplies. and small size needs. [0003] Laminated busbars a...

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Problems solved by technology

[0004] The laminated busbar is a multi-layer composite structure connection bar. The existing laminated busbars are all self-cooling. In the case of synchronous rectification with large currents, neither self-cooling nor air-cooling can meet the high requirements of large currents on heat dissipation efficiency. Therefore, adding water cooling on the basis of laminated busbars has become an urgent solution

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