Patent ID: 6532375
Filing Date: 2003-03-11
Classification: H02J,H04B,H04W,Y02D

Abstract:
A portable communication package comprising:a first battery-powered communication device and a second battery-powered communication device, said first battery-powered communication device having power consumption requirements which are at least an order of magnitude greater than those of the second battery-powered communication device; at least one battery supplying a flow of electricity for powering both of said first battery-powered communication device and said second battery-powered communication device, said at least one battery having first and second output terminals, said first output terminal having a potential that is positive with respect to the potential of said second output terminal, said at least one battery including a first battery and a second battery; and a power management unit for providing an uninterrupted flow of said flow of electricity to said second battery-powered communication device for a predetermined period although said at least one battery has insufficient capacity for providing an uninterrupted flow of said flow of electricity to said first communication device for said predetermined period, said power management unit comprising: an oscillator having a clock signal; an inverter including a P-channel FET having a gate coupled to said clock signal and a channel coupling said first output terminal to an output node, and an N-channel FET having a gate coupled to said clock signal and a channel coupling said second output terminal to said output node; a current-limiting resistor; an intermediate FET having a gate and a channel connected in series with said current-limiting resistor coupling said first output terminal to said second output terminal; a plurality of series-coupled diodes coupling said output node to the gate of said intermediate FET; and a flyback inductor for current from a storage device to intermittently flow through, said intermittent flow being controlled by said intermediate FET to provide a pulsating flyback voltage after rectification and filtering thereof gives an output voltage for powering said first battery-powered communication device.