1. Efficient Switching Regulator for the PowerToad
- Itty James Samuel
Design an efficient switching regulator
Software interface to Multisim

2. What is the PowerToad? www.powertoad.com
2 - AC to DC voltage Converter
6 - A product specific connector.
Laptop Computer with
USB 6
USB 6 4
Variable DC 5
Power 3 5
DC Power 1
AC input 2
Pod
Power
Appliance

3. Circuitry
24 V DC input

4. Ethics Fire hazard of new switching regulator solution
The implemented solution damages a device
Copyright infringements of the design

5. Historical Review Different topologies of switching regulators
Buck regulator most commonly used
Techniques to make buck regulator more efficient

6. Buck Regulator

7. 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

8. 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

9. Milestones Discuss with PowerToad Executives Design Simulation
Develop simple interface to Multisim
Implementation and replace old circuit
Experiment