Seminar on Improved Power Quality AC-DC Converters with High Frequency Transformer Isolation By Prof. Bhim Singh Department of Electrical Engineering Indian Institute of Technology Delhi Hauz Khas, New Delhi-110016, India email:bhimsinghr@gmail.com Ph.: (91)-011-2659-1045

Classification

Improved Power Quality AC-DC Converters with High Frequency Transformer Isolation The control of DC-DC converter is done such as the input current wave shaping is achieved for AC-DC Diode converter. The DC-DC converter can be operated in both DCM and CCM mode. The control technique for DCM and CCM are different. It works as voltage follower in DCM mode and there is no need of input voltage & current sensing for power factor correction.

Applications Lighting such as ballasts, CFL etc. DC Power Supplies, Telecommunication Power Supply, Improved Power Factor ballast, Power Supplies for equipments like computers, medical equipments, printers, scanners etc. Drives Applications with Power Factor Improvement at AC side, Electrical Welding, Lighting such as ballasts, CFL etc.

Single-Phase Buck Boost Flyback AC-DC Converter

Single-Phase Buck Forward AC-DC Converter

Single-Phase Buck Push-Pull AC-DC Converter

Single-Phase Buck Half-Bridge AC-DC Converter

Single-Phase Buck Full Bridge AC-DC Converter

Single-Phase Boost Forward AC-DC Converter

Single-Phase Boost Push-Pull AC-DC Converter

Single-Phase Boost Half-Bridge AC-DC Converter

Single-Phase Boost Full Bridge AC-DC Converter

Single-Phase Buck-Boost Cuk AC-DC Converter

Single-Phase Buck-Boost SEPIC AC-DC Converter

Single-Phase Buck-Boost Zeta AC-DC Converter

Single-phase buck-boost flyback AC-DC converter in DCM

Single-Phase Buck Boost Flyback AC-DC Converter Average current mode control in CCM operation

Single-Phase Buck Boost Flyback AC-DC Converter FLYBACK Converter in DCM

Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM

Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM

Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM

Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM and CCM

Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM and CCM

Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM and CCM

Single-Phase Buck Boost Flyback AC-DC Converter Specifications

Single-Phase Buck Boost Flyback AC-DC Converter Source voltage and current in DCM at 100% load Steady state output voltage in DCM at 100% load

Single-Phase Buck Boost Flyback AC-DC Converter Source voltage and current in CCM at 100% load Steady state output voltage in CCM at 100% load

Single-Phase Buck Boost Flyback AC-DC Converter TABLE I Comparisons of Flyback Converter Operation in DCM and CCM Quantity DCM Operation CCM Operation 10% Load 100% Load Input Current THD 12% 5.1% 11% 4.4% PF 0.981 0.997 0.989 0.998 Output Ripple 0.55% 1.73% 0.52% 1.45% Normalized Current of Switch (pu) Peak 25.1 6.73 6.53 2.60 Average 0.93 0.71 0.54 0.67 RMS 2.87 1.62 1.35 1.14 Normalized Current of Diode 14.5 9.76 10.13 3.95 1.13 1.48 1.29 1.16 5.27 2.86 2.57 1.90 Control Technique Voltage Mode Control Average Current Control Size of Converter Small Large Circuit Simplicity Simple Complex

Single-Phase Buck Boost Flyback AC-DC Converter Vs (V), is(A) Vdc (V) Idc (A) Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC flyback converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =85V, channel-2 1div =5A, channel-3 1div= 100V, channel-4 1div= 2A)

Single-Phase Buck-Boost Cuk AC-DC Converter in DCM

Single-Phase Cuk AC-DC Converter Inductors voltage and current waveforms in DCM

Single-Phase Cuk AC-DC Converter CCM operation

Single-Phase Cuk AC-DC Converter Inductors voltage and current waveforms in CCM

Single-Phase Cuk AC-DC Converter in DCM Operation

Single-Phase Cuk AC-DC Converter in DCM

Single-Phase Cuk AC-DC Converter in DCM

Single-Phase Cuk AC-DC Converter in DCM

Single-Phase Cuk AC-DC Converter Average and peak currents in the semiconductors and input inductor

Single-Phase Cuk AC-DC Converter Average and peak currents in the semiconductors and input inductor

Single-Phase Cuk AC-DC Converter Design Description in DCM and CCM

Design Description in DCM and CCM

Design Description in DCM and CCM

Design Description in DCM and CCM

Single-Phase Cuk AC-DC Converter Specifications

Single-Phase Buck-Boost Cuk AC-DC Converter Source voltage and current in DCM at 100% load Steady state output voltage in DCM at 100% load

Single-Phase Buck-Boost Cuk AC-DC Converter Source voltage and current for 100% load in CCM Steady state output voltage in CCM at 100% load

Single-Phase Buck-Boost Cuk AC-DC Converter TABLE I Comparisons of Cuk Converter Operation in DCM and CCM at Full Load Quantity DCM Operation CCM Operation Input Current THD 5.5% 3.8% PF 0.998 to 1.0 0.9975 to 1.0 Ripple Factor 1.83% 1.67% Peak Current Through Device 170A 60A Control Technique Voltage Mode Control Average Current Control Size of Converter Small Large Circuit Simplicity Simple Complex

Single-Phase Buck-Boost Cuk AC-DC Converter Vs (V), is(A) Vdc (V) Idc (A) Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC cuk converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =175V, channel-2 1div =5A, channel-3 1div= 100V, channel-4 1div= 1.75A)

Single-Phase SEPIC AC-DC Converter in DCM

Single-Phase SEPIC AC-DC Converter in DCM

Single-Phase SEPIC AC-DC Converter in CCM

Single-Phase SEPIC AC-DC Converter in CCM

Single-Phase SEPIC AC-DC Converter Specifications

Single-Phase SEPIC AC-DC Converter in DCM Source voltage and current in DCM at 100% load Steady state output voltage in DCM at 100% load

Single-Phase SEPIC AC-DC Converter in CCM Source voltage and current in CCM at 100% load Steady state output voltage in CCM at 100% load

Single-Phase SEPIC AC-DC Converter TABLE I Comparisons of SEPIC Converter Operation in DCM and CCM Quantity DCM Operation CCM Operation 10% Load 100% Load Input Current THD 10% 6% 3.8% 8.5% PF 0.994 0.997 0.998 0.995 Output Ripple 0.22% 1.27% 1.1% 0.1% Normalized Current of Switch Peak 14.50pu 9.84pu 3.24pu 3.14pu Average 0.76pu 0.77pu 0.71pu 0.78pu RMS 4.60pu 2.18pu 1.50pu 1.39pu Normalized Current of Diode 15.2pu 10.94pu 3.17pu 3.15pu 1.47pu 1.27pu 0.93pu 0.98pu 7.22pu 3.34pu 1.68pu 1.56pu Control Technique Voltage Mode Control Average Current Control Size of Converter Small Large Circuit Simplicity Simple Complex

Single-Phase SEPIC AC-DC Converter Vs (V), is(A) Vdc (V) Idc (A) Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC sepic converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =150V, channel-2 1div =5A, channel-3 1div= 100V, channel-4 1div= 1.75A)

Single-Phase Buck-Boost Zeta AC-DC Converter in DCM

Single-Phase Buck-Boost Zeta AC-DC Converter in DCM

Single-Phase Buck-Boost Zeta AC-DC Converter in CCM

Single-Phase Buck-Boost Zeta AC-DC Converter in CCM

Single-Phase Zeta AC-DC Converter Specifications

Single-Phase Buck-Boost Zeta AC-DC Converter in CCM Source voltage and current in DCM at 100% load Steady state output voltage in DCM at 100% load

Single-Phase Buck-Boost Zeta AC-DC Converter in CCM Source voltage and current for 100% load in CCM Steady state output voltage in CCM at 100% load

Single-Phase Zeta AC-DC Converter Vs (V), is(A) Vdc (V) Idc (A) Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC zeta converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =150V, channel-2 1div =3A, channel-3 1div= 100V, channel-4 1div= 1.75A)

Single-Phase Zeta AC-DC Converter TABLE I Comparisons of Zeta Converter Operation in DCM and CCM Quantity DCM Operation CCM Operation 10% Load 100% Load Input Current THD 11% 4.98% 9.2% 1.36% PF 0.993 0.9975 0.994 0.998 Output Ripple 0.62% 1.99% 0.67% 1.98% Normalized Current of Switch Peak 9.21 4.15 2.92 1.75 Average 0.92 1.01 0.45 0.62 RMS 2.15 1.71 1.04 0.95 Normalized Current of Diode 36.90 20.01 14.6 8.73 4.52 3.02 3.24 3.17 10.45 5.41 5.37 4.57 Control Technique Voltage Mode Control Average Current Control Size of Converter Small Large Circuit Simplicity Simple Complex

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