Abstract: A portable and lightweight power converter adapted to power a portable electronic device, and in addition, which includes a high power battery adapted to provide an output DC voltage to operate and/or charge a portable electronic device when no source power is present. Advantageously, the power converter includes converter circuitry as well as a high power battery packaged as an extremely small device, and further configured to charge a battery of a portable electronic device multiple times with recharging. The converter may further include charging circuitry configured to charge the converter battery when input power is connected.

Abstract: A switching power supply (30) receives an AC voltage at a primary side of a transformer (36) and converts it to a regulated DC output voltage at the secondary side of the transformer (36). The switching power supply (30) includes a voltage regulation compensation circuit (52) to monitor the transformers primary side providing a reference signal VREF related to the transformers secondary side. Signal VCOMP is a current reference signal representative of the primary side inductor current flowing through the emitter of a power transistor (38). VCOMP is fed into a sample and hold circuit (70) and amplified to a DC level proportional to the peak level of the inductor current of the power transistor (38). The output of the sample and hold circuit (70) is fed to two inputs of a multiplier circuit (82) where the output thereof is a square of the two inputs fed to a k-factor circuit (83).