Charge pile knowledge advanced

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Charge pile knowledge advanced: teach you to distinguish DC / AC charging pile

The surge in the number of charging piles in the country, such as the rivers and rivers, is endless, and the waves are pushing the industry to a new climax.

       The number of charging piles is as strong as the sea, no matter how the appearance of the type varies, but the types are the two: DC charging pile or AC charging pile. For ordinary consumers, perhaps not very familiar with the charging principle of charging piles, as a small series of industry practitioners, can provide you with the basic knowledge of some industries in science, so that readers can gradually become familiar with the charging facilities they use every day. What is the matter, and how to different types of charging piles.

       The charging pile is similar in function to the tanker inside 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. It can be based on different voltage levels. Charge various types of electric vehicles. The input end of the charging post is directly connected to the AC grid, and the output end is equipped with a charging plug for charging the electric vehicle.

       The charging pile is currently divided into AC charging pile DC charging pile and AC/DC integrated charging pile.

       The AC pile output single-phase/three-phase AC power is converted into DC power by the on-board charger to charge the vehicle 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. Ground.

       The DC charging pile is a power supply device that is fixedly installed outside the electric vehicle and connected to the AC power grid, and can provide DC power for the non-vehicle electric vehicle power battery. The input voltage of the DC charging pile adopts three-phase four-wire AC380V±15%, the frequency is 50Hz, and the output is adjustable DC power, which directly charges the power battery of the electric vehicle. Since the DC charging pile is powered by a three-phase four-wire system, it can provide sufficient power, and the output voltage and current adjustment range is large, which can achieve the requirement of fast charging.

How to judge whether the charging pile is an AC pile or an AC pile?

       Generally speaking, the DC charging pile has a large type (there are a certain number of AC-DC power modules inside, the more the number of modules, the larger the pile), and the AC charging pile is smaller, and the more obvious difference is: the gun head ( The charging line is different. The DC charging post is a 9-wire plug, and the AC charging post is a 7-wire plug.

       The design of the AC charging pile electrical system is shown in the figure. The main circuit consists of an input protection circuit breaker, an AC smart energy meter, an AC control contactor and a charging interface connector; the secondary circuit is controlled by a relay, an emergency stop button, an operating status indicator, The charging pile intelligent controller and the human-machine interaction device (display, input and swipe) are composed.

       The main circuit input circuit breaker has overload, short circuit and leakage protection functions; the AC contactor controls the power supply on and off; the connector provides a charging interface connected with the electric vehicle, and has a locking device and an anti-misoperation function.

       The secondary circuit provides “start-stop” control and “emergency stop” operation; the signal light provides “standby”, “charge” and “full” status indications; the AC smart energy meter performs AC charging measurement; the human-machine interaction device provides credit card charging and charging. Mode setting and start-stop control operation.

       For an electric car, battery charging equipment is one of the indispensable subsystems. Its function is to convert the electrical energy of the grid into the electrical energy of the electric vehicle's vehicle battery. There are different methods for classifying electric vehicle charging devices, which can be generally classified into in-vehicle charging devices and off-board charging devices.

       The vehicle charging device refers to a device installed on an electric vehicle that charges the battery pack by using a ground AC power grid and a vehicle power source, including an in-vehicle charger, an in-vehicle charging generator set, and an energy recovery charging device, and an AC power cable with a plug. The cable is directly plugged into the charging socket of the electric vehicle to charge the battery. The in-vehicle charging device usually uses a contact charger with a simple structure and convenient control, or an inductive charger. It is designed according to the type of vehicle battery, and it is highly targeted. The non-vehicle charging device, that is, the ground charging device, mainly includes a dedicated charging device, a dedicated charging station, a universal charging device, a charging station for public places, and the like. It can meet a variety of charging methods for a variety of batteries. Generally, the power, volume and weight of the off-board charger are relatively large, so that it can adapt to various charging methods.

       The above knowledge makes a systematic description of DC and AC charging piles, which is a knowledge of the author's professionalism from the industry. The article covers a lot of technical terms, it may not be too easy, but the professionalism is remarkable, it can be called the advanced science of charging pile knowledge, perhaps with certain professional knowledge, can read More convenient.