1. 전자의료시스템 및 실습 PWM 구 환 경희대학교 전자정보대학 동서의료공학과

2. PWM Description - PWM(Pulse Width Modulation) - 일정한 전압에 일정한 주기를 갖는 펄스 열에서 High 레벨의 펄스 폭 이 사용자가 지정한 값으로 바뀌는 파형 - PWM 주기 (period) - PWM 주파수 (frequency) - Duty Cycle: 전체 주기에서 하이 레벨의 펄스 폭의 % - 아날로그 신호 레벨을 디지털 신호 레벨로 묘사하는 데 매우 유용 - PWM 의 듀티는 아날로그 신호의 에너지를 의미 - DC 모터를 제어하거나 특정 아날로그 파형을 PWM 파형으로 변환 가 능 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

3. PWM Waveform 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

4. Generation of PWM Outputs Using the GP Timers PWM Operation - To generate a PWM output with a GP timer, a continuous up- or up- /down- counting mode can be selected. - To set up the GP timer for the PWM operation, do the following: 1. Set up TxPR according to the desired PWM(carrier) period 2. Set up TxCON to specify the counting mode and clock source, and start the operation 3. Load TxCMPR with values corresponding to the on-line calculated widths(duty cycles) of PWM pulses - TxPR = (PWM period / GP timer input clock) – 1 - Continuous up- : Asymmetric Waveform Continuous up-/down- : Symmetric Waveform 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

5. Compare Unit Block Diagram 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

6. Register Setup for Compare Unit Operation 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

7. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

8. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

9. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

10. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

11. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

12. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

13. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

14. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

15. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

16. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

17. PWM Circuits Block Diagram 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

18. Dead-Band? Description - 순간적이지만 H- 브리지 회로에서 쇼트 회로가 발생하는 것을 막기 위 한 장치 - PWM 레벨 전환 시 약간의 지연 시간을 두어 쇼트 회로가 만들어지는 상황을 피하도록 하는 기능 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

19. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

20. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

21. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

22. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

23. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

24. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

25. Output Logic Block Diagram 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

26. Asymmetric PWM Waveform Generation 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

27. Symmetric PWM Waveform Generation 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

28. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

29. 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea

30. Quadrature Encoder Pulse(QEP) 2007 Summer SeminarImpedance Imaging Research Center, Kyung Hee University, Suwon, South Korea