Wireless phone charging is attractive in many situations, but it may not be as attractive as it is in a car. As we spend more and more time in the vehicle (rarely because there is no choice), whether it is daily commuting or picking up children's back and forth activities, it is very important to be able to charge the phone while traveling.
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However, it is unpopular to have the charging cable wrapped around the front seats of the vehicle and may be dangerous. In addition, the required cables are inevitably going to be at home or in the office, not in the car! Therefore, the wireless solution in the vehicle is attractive.
Car wireless charging has a number of challenging and demanding requirements, and you need to check your wish list before implementing an optimization solution. Security in a mobile application environment (such as in a car) is critical and some potential issues in implementing wireless charging must be addressed. These concerns can be solved with the recent announcement of cooperation between ON Semiconductor and Convient Power Systems (CPS).
First of all, in the car, distracting you is the most important thing to avoid, so the real 'putting and charging' is a must, because the driver can't stand the locating for his/her mobile phone to start charging. The CPS solution uses our NCV6500 to support multi-coil array design, which achieves free positioning without dead spots.
Second, appropriate mechanisms need to be in place to prevent metal objects from heating up during charging, causing product damage or charging problems. This requires balancing safety and interoperability with mobile phones that employ so-called "friendly" metal components such as camera ring battery shields or antennas. The foreign matter detection technology that can avoid errors alleviates the problem of intermittent or slow charging.
CPS has developed a patented method that complies with the Wireless Charging Alliance (WPC) standard to enable foreign object detection prior to power transmission. In addition to the scanning power receiver, it also performs a system surface scan of metal objects and determines if they will heat up during charging. This method works for any receiver (not just Qi 1.1 Rx) and can be adapted via software to work with newly released phones. This technology facilitates safe power transfer and limits interoperability issues caused by false metal detection.
ON Semiconductor's automotive-certified NCV6500 wireless charging controller provides the necessary building blocks for inductive charging of the overall system wireless solution and meets Qi and PMA standards. More importantly, it is designed around the most effective 15W in this fast-growing market. The device is available in a small, easy-to-integrate package that operates from 5V to 14V, includes five differential and single-ended op amps, and two comparators with hysteresis and anti-spike capability.
The alliance between ON Semiconductor and CPS has created the only system-level solution on the market that combines ON Semiconductor's ASIC expertise with CPS's system design expertise to help automotive customers design and provide more reliable solutions.
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