The communication system is becoming increasingly complex, and various expanding and diverse load power supply demands are also increasing. As the heart of communication systems, communication power supply is an essential and important component. To avoid faults such as communication circuit interruption and communication system paralysis, the communication power supply must be stable, small, efficient, and reliable.
Driven by technological upgrades and expansion of application scope, communication power is managing the relationship between load and efficiency through intelligent methods, optimizing and regulating communication systems, achieving more applicability and flexibility, and ensuring long-term stable operation.
The polar sea APM32F407 communication power supply scheme takes stability as the premise, ensuring the overall speed, accuracy, and smoothness of the scheme. A single MCU can fully digital control the PFC unit and full bridge LLC unit, achieving zero voltage switching across the entire load range, improving efficiency and reliability.
The main control unit of this scheme is the Polar Sea APM32F407 high-performance MCU, which is a compact isolated AC/DC power supply design with digital control. It includes two main power units: the front-end boost type power factor correction unit PFC, and the back-end resonant LLC full bridge isolated DC/DC converter unit. It can generate PWM waveforms, variable duty cycle, variable switching frequency, and phase shift control suitable for power electronic switching devices in all operating modes.
The working process of the APM32F407 communication power supply scheme is as follows:
The ADC module of APM32F407 obtains digital signals of the AC input voltage Vac-LN, current Ig, and bus voltage Vdc current OCP of the PFC unit, and obtains LLC level output voltage Vout current and Iout digital signals through isolation sampling.
The above digital signals, supported by the powerful floating-point operation capability of the APM32F407 core, achieve loop calculation and logic control functions of PFC and LLC units within a single sampling cycle.
The loop calculation results are output through the advanced timer module of APM32F407, which outputs the PWM waveform of the PFC unit's constant switching frequency varying duty cycle, as well as the PWM waveform of the LLC unit's constant duty cycle varying switching frequency. Ultimately, the power factor improvement and boost function of the PFC unit, as well as the LLC unit's stable output voltage and response to load transient changes, are achieved.
Advantages of APM32F407 communication power supply solution:
32-bit Arm ® Cortex ®- M4F core, with a maximum main frequency of 168MHz, supporting loop control of PFC and LLC;
Built-in 3 12 bit ADCs, each with a maximum of 16 external channels, supporting DMA, which can meet the needs of PFC+LLC communication power supply 3-channel voltage and 3-channel current acquisition;
Two 16 bit advanced timers TMR1 and TMR8 that can provide 7-channel PWM output, supporting functions such as dead zone generation and brake input, meeting the control requirements of five switching devices in the communication power PFC unit and LLC unit, and the brake input can quickly stop and protect the devices from damage in emergency situations;
4 USART and 2 UART communication interfaces can meet the interaction requirements of power supply and upper system;
The maximum capacity of Flash is 1MB, and the maximum capacity of SRAM is 192KB+4KB, which meets the requirements of program storage and computation, and has redundancy for program expansion;
Built-in backup register allows for flexible storage of control parameters without the need for external EEPROM;
Support AC voltage AC90V~AC264V, frequency 50/60Hz, compatible with the entire power grid.
The polar sea APM32F407 communication power supply solution supports real-time monitoring and rapid protection of rectifier input voltage and current, RMS input voltage and current, bus voltage and power supply, and output voltage and current. It is very suitable for applications in commercial networks and servers, industrial AC/DC power supply, new energy, energy storage, and other fields.
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