Systems and methods described herein relate to an adapter driver board for parallel operation of power modules. The systems and methods receive an electrical signal at an input interface of a high voltage adapter board. The systems and methods may deliver the electrical signals to first and second switches along corresponding first and second conductive traces. The first conductive trace extends along the high voltage adapter board and is conductively coupled to the input interface and the first switch. The second conductive trace extends along the high voltage adapter board and is conductively coupled to the input interface and the second switch. The first and second conductive traces may have an inductance or other property that is substantially the same as each other.

A surge protection module comprises an upper cover, a lower cover, a printed circuit board assembly (PCBA) and a flame-retardant filler. The lower cover is configured for connecting with the upper cover, and for forming an accommodation space together with the upper cover. At least one through hole is formed at the junction of the lower cover and the upper cover. The PCBA has a plurality of copper traces, and is equipped with at least one surge protection device (SPD). The PCBA further has a plurality of welding structures, and the welding structures are electrically coupled to the SPDs through the copper traces. The PCBA is disposed in the accommodation space, and a part of the PCBA passes through the at least one through hole for exposing the welding structures. The flame-retardant filler is filled in the gap of the accommodation space.

Systems and methods described herein relate to an adapter driver board for parallel operation of power modules. The systems and methods receive an electrical signal at an input interface of a high voltage adapter board. The systems and methods may deliver the electrical signals to first and second switches along corresponding first and second conductive traces. The first conductive trace extends along the high voltage adapter board and is conductively coupled to the input interface and the first switch. The second conductive trace extends along the high voltage adapter board and is conductively coupled to the input interface and the second switch. The first and second conductive traces may have an inductance or other property that is substantially the same as each other.

A surge protection module comprises an upper cover, a lower cover, a printed circuit board assembly (PCBA) and a flame-retardant filler. The lower cover is configured for connecting with the upper cover, and for forming an accommodation space together with the upper cover. At least one through hole is formed at the junction of the lower cover and the upper cover. The PCBA has a plurality of copper traces, and is equipped with at least one surge protection device (SPD). The PCBA further has a plurality of welding structures, and the welding structures are electrically coupled to the SPDs through the copper traces. The PCBA is disposed in the accommodation space, and a part of the PCBA passes through the at least one through hole for exposing the welding structures. The flame-retardant filler is filled in the gap of the accommodation space.