Nowadays, wireless charging products on the market are generally upgraded to wireless fast charging, which is 7.5W and 10W, and will be developed to 15W in the future to improve the user experience. Currently, the wireless charging protocol is mainly the Qi standard of the WPC wireless charging alliance, in which the BPP covers the output power. For products less than or equal to 5W, EPP includes products larger than 5W up to 15W.
With the increase of wireless charging power of mobile phones, EPP authentication at the wireless transmitting end will become an inevitable trend, and the latest Qi standard with version number v1.2.4 enforced by the WPC Wireless Charging Alliance from March 8 clarifies the relevant requirements of EPP. .
Compared with Qi v1.2.3, Qi v1.2.4 has the following major updates: 1. The transmitter type MP-A11 is officially included in the Qi standard in Qi v1.2.4; 2. The EPP increases the temperature rise requirement; 3. The transmitting end is entering Before the power transmission phase, the Q value is used to detect the foreign matter on the interface surface; 4, the correction power loss calculation is added, and the foreign matter detection in the power transmission phase is extended.
The increased temperature rise requirement of EPP, Q value detection and correction power loss calculation make the wireless charging system more secure and user experience better.
NU1015 with Voda Master NU1509 has passed WPC1.2.4 EPP certification, is the world's most integrated EPT certified 15W wireless charging transmitter solution.
This wireless charging transmitter chip features high integration, high performance and high efficiency. It supports WPC's latest V1.2.4 specification Qi protocol standard, including 5W BPP, 10W/15W EPP, and Samsung Fast Charge SFC and Apple Fixed Frequency 7.5. W fast charge. Input voltage range is 12V to 15V, can be connected to micro USB / type- C or DC power supply, charging efficiency is 82% at 15W.
Voda NU1509+NU1015 wireless charging transmitter 15W solution adopts the fixed frequency voltage regulation architecture proposed by Apple at MFi conference. With MP-A11 topology, the working frequency is fixed at around 127KHz, the duty cycle is constant at 50%, through adjustment Voltage to control the transmit power.
Compared with the frequency conversion architecture, it can effectively avoid the interference frequency band of the mobile phone, so that the wireless charging minimizes the interference to the mobile phone and the communication stability is better. Compared with the fixed frequency modulation duty cycle architecture, the transient response is better, and there is a Q value. The detection circuit is more sensitive in FOD detection and meets the requirements of EPP. The integrated Buck circuit minimizes the influence of fluctuations in the input voltage on the receiving end and provides higher safety.
The NU1015 is a highly integrated 15W intelligent power full bridge chip that has passed WPC1.2.4 EPP certification, integrated power full bridge, full bridge drive, Q value detection, current sampling, digital demodulation, 5V DC/DC power supply. Includes protection features such as input voltage undervoltage lockout, overvoltage protection, overcurrent protection and thermal shutdown.
These regulations further enhance the reliability of the entire system solution. Input voltage range is 4 to 16V, charging efficiency is 84% @10W & 82.14%@15W, 18V overvoltage protection, 8A overcurrent protection, 155 degrees Celsius over temperature protection, 4mm*4mm QFN package.
The NU1509 integrates all the necessary functions for power regulation and maintains reliable communication with WPC-compatible receivers. The NU1509 also emphasizes protection against any transient conditions such as receiver load variations and RX/TX coupling variations. The input voltage range is 3.3V to 5.5V, PWM output frequency 127.7kHz ± 6HZ, reliable and accurate foreign object detection (FOD), LED charging status and fault reporting, built-in FSK modulation and fast charging protocol, 4mm x 4mm QFN package.
Vodafone Semiconductor is a semiconductor company specializing in wireless charging IC design, system and solution design. Its strength lies in the design of power supply chip and power system design. In addition to the 15W transmitter solution, Vodafone also increases the difference of 5W/10W. The power transmitter solution opens up the use of powerstage to the market.
- View original
- Article correction
