Wireless charging, also known as inductive charging or contactless inductive charging, utilizes near-field induction, or inductive coupling, to transfer energy from a power supply device (charger) to the device using the power. The device then uses the received energy to charge its battery and power its own operation. Energy is transferred between the charger and the device via inductive coupling, eliminating the need for wires and thus eliminating exposed conductive contacts on both. With technological advancements, wireless charging technology has matured significantly, finding applications in various industries and scenarios, including smartphones, wearable devices, and automobiles. Compared to wired charging, wireless charging is less affected by weather conditions, offering advantages such as greater intelligence, efficiency, convenience, and safety for electric vehicle charging. The biggest drawback of traditional chargers is the tangled and confusing charging cables, which can pose safety hazards such as fires due to aging wires. Many people simply want to be free from the constraints of charging cables.
With strong government support, the new energy vehicle industry has developed rapidly in recent years, and more and more people are choosing electric vehicles as an environmentally friendly mode of transportation. Many automakers also consider it the future direction of automotive development and have invested heavily in research and development. However, due to the practical obstacles of charging, it has not yet been widely adopted. We know that the most important parts of an electric vehicle are the battery and the charging station. Due to technological bottlenecks, they can only use lithium batteries in the short term, so wireless inductive charging stations have become another key area of research and development. Compared with wired charging stations, wireless charging has several advantages and can align with the future development trend of new energy vehicles.
While wired charging technology has achieved some success, it still has shortcomings. For example, the minimum transmission distance cannot be less than 20cm, and the transmission distance of electromagnetic induction wireless charging technology is within 15cm. Therefore, in-depth research has been conducted on the transmission distance, proposing to control the transmission distance of electric vehicles to 12-20cm through pulse width modulation control. Some researchers have even achieved the goal of 20cm transmission distance for wireless charging technology by directly adding coils.
The advantages of wireless charging are thus evident: wireless chargers offer a superior experience in terms of safety, flexibility, and versatility. The contactless, one-to-many charging method significantly reduces the safety hazards caused by poor contact resulting from frequent plugging and unplugging of data cables. As wireless charging technology matures, the battery capacity issue in electric vehicles will be fully resolved, leading to smaller overall battery space and significant changes in vehicle configurations, particularly for electric motorcycles, which will experience substantial growth. More attractive models and a wider range of new features will be available on these vehicles.
my country's electric vehicle (EV) industry is developing rapidly. EVs rely on batteries for power, which are energy-intensive and deplete relatively quickly. However, current battery capacity is limited, offering little advantage for medium- to long-distance travel. This necessitates timely charging when the battery is nearly depleted to continue driving. Current charging stations invert AC power from the grid before transmitting it to the battery. Directly introducing the inverter can impact the grid and negatively affect its stability, while also resulting in slower charging speeds – a significant obstacle to EV development. Wireless charging technology, however, allows for charging without cables. It enables charging anywhere equipped with wireless charging devices, even while driving, improving range and efficiency. Furthermore, wireless charging avoids damage caused by battery removal and installation, and eliminates the risk of accidents due to human contact during charging.
