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HW/SW Codesign Project PWM Control IC

HW/SW Codesign Project PWM Control IC. 曾任輝 林柏丞. Outline. Buck Converter PWM IC A/C Converter PID regulator DPWM Simulation Summary. Buck Converter. PWM Control IC Block. IC Function. A/D -----A complete analog controller could be simpler than a high-speed high-resolution A/D.

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HW/SW Codesign Project PWM Control IC

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  1. HW/SW Codesign ProjectPWM Control IC 曾任輝 林柏丞

  2. Outline • Buck Converter • PWM IC • A/C Converter • PID regulator • DPWM • Simulation • Summary

  3. Buck Converter

  4. PWM Control IC Block

  5. IC Function • A/D-----A complete analog controller could be simpler than a high-speed high-resolution A/D. • PID regulator------ Available microcontroller/DSP systems are still too complex and costly. • DPWM-----High-speed/ High-resolution digital pulse width modulators are needed.

  6. Proper Resolution for A/D

  7. PID regulator • Control law for PID regulator :d[n]=d[n-1]+ae[n]+be[n-1]+ce[n-2]

  8. DPWM resolution

  9. DPWM

  10. Behavior description for a buck switching converter by MATLAB/SIMULINK

  11. Simulation Result • Change of the output voltage (top) for the change of output current from 0.3A to 1A • output voltage is regulated at 1.5v for a 3.3v input voltage

  12. Summary • Through loop analysis for the entire system, tune the parameters of the PID regulator to meet the loop bandwidth or adequate phase margin. • Under a specification of the regulator, select the proper resolution of ADC and DPWM to avoid “limit cycling”. • Supply regulator are widely used in communication, computer, consumer products.

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