Application of pwm technology

• 1. Application of PWM TechnologyCISMM Lab Research Talk4/20/2012 Kaiwen Qi

2. Outline Signal Signal Processing PWM Application High Resolution PWM in Our Project 3. Signal What is a signal? Flag semaphoreSignal flare Flash light Signal: conveys information about the behavior or attributes of some phenomenon 4. Signal Electrical signals are easy totransmitand operate Information is converted to electrical signal 5. Signal classification Analog signal and digital signal cardiogram Cars/hour (passing over a bridge) 6. Signal classification Periodic signal and non-periodic signalPeriodic signalNon-periodic signal 7. Signal Processing Signal transformed from one form to anotherExample 1Audio signal processing 8. Signal Processing Example2 Mp3 player Goal of signal processing: Obtain the desired form for future transmission, analysis 9. What is a PWM PWM (Pulse Width Modulation) is a series of pulses with different duty cycletime in the fixed period time while duty time stands for the proportion of ontime in the period. In practice, it is determined and modified by a sequence of expected valueor modulating signal. 10. Application of PWM Example 1Lighting control 11. Application of PWM Example 2 12. Generating Sine From PWMFrom PWM to Sine 13. Generate Sine from PWM Fourier series Square wave 14. Frequency Selective Network 15. Simulation Result 16. Testing ResultPWM (5v/div, 5us/div)Sine voltage (20v/div, 5us/div)Amplified drivingvoltageDesign implemented successfully 17. ThanksQuestions?