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Efficient Switching Regulator for the PowerToad - Itty James Samuel Design an efficient switching regulator Software interface to Multisim What is the PowerToad? www.powertoad.com 2 - AC to DC voltage Converter Laptop Computer with USB 6 - A product specific connector. 6 Variable DC Power 1 AC input 5 2 6 USB 4 3 5 Pod Power Appliance DC Power Circuitry 24 V DC input Ethics Fire hazard of new switching regulator solution The implemented solution damages a device Copyright infringements of the design Historical Review Different topologies of switching regulators Buck regulator most commonly used Techniques to make buck regulator more efficient Buck Regulator Q1 L0 I Q1 T on VO ~ Vdc T IO R1 Vdc V1 D1 EA C0 Vea R2 VREF Current/ voltage Amplifier VT PWM Vwm Considerations for efficient design Increase the duty cycle Two-stage device Earlier designs used the same idea, but had voltage spikes due to leakage inductance An extra inductor winding is added to compensate voltage and reduce spikes Soft Switching MultiSim 7 Java interface to simulate buck regulators Enter values for a switching regulator Vin, Vout, I (current), Vref Interface produces a netlist, which can be imported into MultiSim Calculates Inductor, capacitor, and resistor values Milestones Discuss with PowerToad Executives Design Simulation Develop simple interface to Multisim Implementation and replace old circuit Experiment