Ncp1342 chip substitute pn8213 65W gallium nitride charger scheme

FS68001 encapsulation SOP8 The wireless charging system includes primary and secondary coils , Coupled to each other by electromagnetic fields . The ferrite of the two coils as part of its structure further limits the field coupling . The primary coil is from AD-DC The adapter supplies power to the transmitter to drive the transmitter with a switching waveform . The secondary coil is connected to the rectifier and can output directly from the battery or electronic charger or secondary voltage stabilizing connection . In the system, the capacitor and the coil are connected in series to produce resonance , Better transmission . In the resonant system, it is easy to control the transmission power by frequency conversion .WM1212 Frequency and pulse width modulation methods are used to control power transmission . When the operating frequency is close to 205KHz And when the receiver has low power ,WM1212 Reduce PWM Duty cycle adjustment output . The output voltage of the rectifier is generated by the secondary microprocessor to control the modulation and coding information to monitor from the secondary side to the primary side . The encoded information is composed of packets , There are boot bytes 、 Header byte 、 Information byte and check byte . according to WPC standard , Packets can be associated with identification , To configure , Control error , Rectifier power supply , Charging state , And power transmission end information .

  Support Android and iphone 8 Mobile phone 5W Wireless charging chip

One    summary

The wireless charging system includes primary and secondary coils , Coupled to each other by electromagnetic fields . The ferrite of the two coils as part of its structure further improves the field coupling . The primary coil is from AD-DC The adapter supplies power to the transmitter to drive the transmitter with a switching waveform . The secondary coil is connected to the rectifier and can output directly from the battery or electronic charger or secondary voltage stabilizing connection . In the system, the capacitor and the coil are connected in series to produce resonance , Better transmission . In the resonant system, it is easy to control the transmission power by frequency conversion .WM1212 Frequency and pulse width modulation methods are used to control power transmission . When the operating frequency is close to 205KHz And when the receiver has low power ,WM1212 Reduce PWM Duty cycle adjustment output . The output voltage of the rectifier is generated by the secondary microprocessor to control the modulation and coding information to monitor from the secondary side to the primary side . The encoded information is composed of packets , There are boot bytes 、 Header byte 、 Information byte and check byte . according to WPC standard , Packets can be associated with identification , To configure , Control error , Rectifier power supply , Charging state , And power transmission end information .

 

Two    application

2  characteristic

2.1 Main specifications and parameters

l  Intelligently control the transmission power between the base station and the mobile device

l  Comply with wireless power （WPC） as follows

n WPC1.1 Foreign object detection (FOD)

n WPC1.0 Parasitic metal detection (PMOD)

l  Parasitic metal detection is used to improve security during wireless power transmission

l  Operation status indication

n  standby

n  Transmission power

n  Charging complete

n  fault

2.2  Application circuit characteristics

l  Dynamic power limitation （DPL） It can be from a limited current 5-V Power supply （ for example ：USB port ）

l  The transmitter coil supplies correction information to the receiver

l  Input power 5V

l  standard WPC Non magnetic emission coil

l LED  Indicates power transmission or fault status

l  The sound indicates that the transmission power needs to add a buzzer on the board

2.3  application

WM1212-M The demo module is wm1212-M The transmitting part of the wireless charging system . The transmitting module provides WM1212-M The transmitter of the receiver .wm1212-M The module needs one that can achieve 2A Of 5 V Power supply to the transmitting circuit 、LED Indicator light 、 Transmitting coil on circuit board . The module has the following characteristics ：

•  Dynamic power limitation （DPL） From a finite current 5V Power supply （ for example ：USB port ）.

•  The transmitter coil provides the receiver information

•  Input power 5 V

•  standard WPC A11 Non magnetic emission coil

• LED Indicates power transmission or fault status

•  The sound indicates that the transmission power needs to add a buzzer on the board