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Søren Poulsen, Ørsted·DTU, Automation Technical University of Denmark NORPIE 20041 Hysteresis Controller with constant switching frequency.

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Presentation on theme: "Søren Poulsen, Ørsted·DTU, Automation Technical University of Denmark NORPIE 20041 Hysteresis Controller with constant switching frequency."— Presentation transcript:

1 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20041 Hysteresis Controller with constant switching frequency Søren Poulsen Ph.D. Student Ørsted·DTU Technical University of Denmark spo@oersted.dtu.dk Michael A. E. Andersen Professor Ørsted·DTU Technical University of Denmark ma@oersted.dtu.dk

2 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20042 Standard hysteresis controllers Current or voltage mode

3 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20043 Band pass current mode Current loop with bandpass function –Only control of output filter resonance

4 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20044 Hysteresis controllers Benefits –Sawtooth shaped carrier Linear modulation –Modulator includes power stage Error reduction –Open loop bandwidth = f s Concerns –Switching frequency dependent on modulation index:

5 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20045 Constant switching frequency hysteresis modulators Variable FW gain –Hysteresis clamp –Variable gain amp

6 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20046 Constant switching frequency hysteresis controller Hysteresis controller with additional comparator and integrator

7 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20047 Carrier distortion Control output WILL have HF content –Adds to the carrier –Adding control decreases performance of inner modulator loop Shaping inner/outer loops in a way so control output inherently adds to carrier constructively

8 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20048 Shaping modulator and feedback

9 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20049 Constant switching frequency prototype Very low cost implementation fs,0  150kHz Closed loop bandwidth = 30kHz Modulator loop propagation delay: 325ns

10 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200410 Constant switching frequency prototype 2-layer PCB +/- 40V supply

11 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200411 Prototype carriers

12 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200412 Prototype switching frequency, M=0.8, 10Hz, 100Hz, 1kHz

13 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200413 Prototype switching frequency, DC

14 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200414 Conclusion Almost constant switching frequency for low frequency modulation Very simple modulator design Low cost implementation possible Additional feedback without distorting the carrier is possible ”Perfect” first carrier signal despite only passive modulator loop

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