Details
Let's introduce the common functional applications of relays in DC charging piles. The six parts are common functional applications in AC security disconnection, DC discharge circuit, connection detection, ground failure detection, signal connection, and DC security cutting.
Many relays are used on the DC charger, the YE209 series relay and YV contactor used on DC is used.
YE209 low contact resistance (0.2MΩ) reduces the heating loss and supports high -volume applications. It can achieve a low contact resistance of 0.2MΩ, which effectively suppress the fever as a miniaturization and high -capacity major topic. In addition, compared with the contactor of the same current capacity, the height of only about 1/3 of the compact size is used, which helps to realize the miniaturization and spatialization of the equipment.
Of course, in addition to YE209 in the DC security cutting part, there are other alternatives. The same ones on the DC charging pile on the AC security disconnection, DC discharge circuit, connection detection, ground fault detection, and signal connection relay can also find replacement.
As the core control element of electric vehicle charging piles, the quality of relays directly determines whether the charging control system can work normally. Almost all the electric vehicle charging piles in the market control the power switch through relays. When we scan the code and charging on the charging socket, click to open the charging relay closed to connect the power supply. After pulling out the plug, the electric vehicle charging pile detected the load to pull out, the relay was disconnected, and the power supply stopped output. If the relay is due to its own quality, or the product designer selects inferior relays in the early stage of design, relay failures will occur.
The place where relays are usually used are weak power control strong electricity. We control the 220V voltage when charging electric vehicles by 5V or 12V. The motherboard control chip is intelligently judged according to the charging data collected by the system. When charging, the output is low voltage, control the relay to connect to the closed output power supply, and end the chip to open the low voltage output when the charging is completed.
The relay has the function of circuit isolation, and isolates the low -voltage control system from the strong power supply system circuit. In this way, the strong electric circuit does not affect the weak electric circuit and does not affect the overall operating performance of the equipment.