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数字电源设计





Intelligent Power Integration: Digital Control






















Other Integration Levels









Full digital control replaces the standard analog design and also provides the power management functions of Levels one to three integration. The power supply regulation function is directly controlled by the digital circuits on the processor and the software running on the processor. The full digital solution allows the designer to employ techniques that are not possible with the analog solution, including proprietary digital compensation algorithms and non-linear control techniques. The full digital solution enables a customized response to power input change or load change events, which can lower system cost and increase system efficiency. Microchip’s 16-bit dsPIC® DSCs enable the Level 4 solution. Feedback from the power supply is obtained using high-speed ADCs. The power supply is controlled using specialized high-speed PWM peripherals. The PWM module can directly drive all popular power supply topologies and the CPU core allows digital compensation algorithms to be executed quickly.

dsPIC DSCs can be used for various power conversion and power control applications and they offer Higher power density, Lower System Cost, improved reliability, Lower manufacturing and maintenance cost.



Find suitable Software, Tools & Training for your power application below













Level 4 Integration Examples



























PFC with Advanced Digital Control



Power Factor Correction (PFC) is essential in higher wattage power supplies to reduce harmonic contents, system losses and radiated emissions. In this example the dsPIC DSC simplifies implementing Boost- PFC algorithms with a technique of Average Current Mode Control. The current signal is calculated digitally by computing product of rectified input voltage, the output of voltage error compensator and output of voltage Feed-Forward Compensator. Implementing the digital PFC function uses little of the DSC resources leaving plenty of additional capability to perform the rest of the primary side control.




























AC-DC Conversion with Complete Digital Control



Are you facing challenges in designing an efficient, reliable, cost effective AC-DC power supply supply with advanced features? Our family of dsPIC DSCs can help optimize design cycles effectively. The high-speed PWM module with multiple advanced operating modes helps implement various advanced conversion stages such as PFC, phase shift zero voltage transition converter with full-bridge conversion and synchronous rectification and multi-phase buck converters. Our high-speed ADC can be triggered on an edge of PWM to sample the various voltages and currents for high speed processing. The high performance CPU helps in implementing advanced PID digital control loops and compensators in software.




























Full Digital DC-DC Conversion



The dsPIC33FJXXGS DSC in power efficient and highly integrated DC-DC converters dynamically controls different power stages. High-speed ADC, PWM and comparators work together without using much CPU bandwidth. Faster digital control loops and compensators can be executed using a high performance DSP engine. Advanced features such as dynamic load response, protections, sequencing, remote control and communications can also be implemented.



Digital Power: Quick Reference Table












Application Types:


  • Power Conversion
  • Power Control & Management
  • Lighting
  • Power Metering & Protection



Digital Power Applications:


  • Power Factor Correction
  • AC – DC Conversion
  • DC – DC Conversion
  • Intelligent Battery Chargers
  • Inverters & UPS
  • Telecom Power Supply
  • High Intensity Discharge Lighting Ballast
  • LED Lighting Control
  • Automotive Interior Lighting



Control:


  • PID Control of SMPS Performance, such as output voltage and current
  • In-rush Current Control
  • DSP Implementation of feedback filter, error amplifier.
  • Topology and Mode control



Monitoring & Communication:


  • Input/Output Current
  • Input/Output Voltage
  • Temperature
  • SM Bus & Customized communication protocols on UART, SPI & I2C



Features Possible:


  • Level1,2 and 3 Features
  • Loop filter response based on digital filter techniques
  • Contineously variable loop filter responses
  • Non-liner response characteristics
  • Fast Acquisition functions
  • Thermal compensation and End of Life Prediction
  • Higher level of IP protection
  • Self Calibration



Analog Access Requirements:


  • MOSFETs
  • MOSFET Drivers
  • Temperature Sensors
  • Opto couplers
  • Diodes



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