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Ncp1342 chip substitute pn8213 65W gallium nitride charger scheme
2022-07-05 11:36:00 【Shenzhen Oceanwide Microelectronics Co., Ltd】
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
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