Communication

The function of the charging pile is similar to that of the tanker in the gas station. It can be fixed on the ground or wall, installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations, and can charge various types of electric vehicles according to different voltage levels. The input end of the charging pile is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging the electric vehicle.
Charging piles are currently divided into AC charging piles and DC charging piles. The AC pile outputs single-phase/three-phase AC power through the on-board charger to convert into DC power to charge the on-board battery. The power is generally small (7kW, 22kW, 40kW, etc.), and the charging speed is generally slow, so it is generally installed in the parking lot of the community. The DC charging pile (or non-on-board charger) directly outputs DC power to the on-board battery for charging. The power is larger (60kW, 120kW, 200kW or even higher), and the charging speed is faster, so it is generally installed next to the highway. charging station.

The alternating current in the power grid directly supplies power to the on-board charger (OBC) through the AC charging pile. The OBC converts AC into DC, and then charges the power battery in the car through the distribution box. The DC charging pile contains many AC-DC power modules. Judging from the current situation of the charging pile market, there are three major trends: a wide range of constant power, a wide range of output voltage, and higher power modules.
Two main power stages. First, the power factor correction (PFC) stage maintains the phase relationship between the input current and voltage, minimizing the total harmonic distortion (THD) of the line/grid current. This helps reduce any wasted reactive power and improves overall energy efficiency.
The second power stage is a DC-DC converter that takes the DC output from the PFC stage and converts it to the level required to charge the battery. The output voltage and current of the converter vary over time based on the overall state of health and state of charge of the battery.
Whether it is power factor correction (PFC), primary side DC-DC, or secondary rectification, Jiejie Microelectronics has corresponding solutions. Automotive products include diodes, MOSFETs, TVS and other products. For example, rectifier + LLC constitutes the basic circuit of the charging pile, and FRED (fast recovery diode) scheme can be adopted. ESD protection of CAN communication port.
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