초록 ▼

A battery charger (100) with active feedback voltage controller includes a pass device (144), such as a metal-oxide-semiconductor field-effect transistor (MOSFET), and uses either hardware, software, or a combination of hardware and software, to implement an active feedback voltage controller (130).

A battery charger (100) with active feedback voltage controller includes a pass device (144), such as a metal-oxide-semiconductor field-effect transistor (MOSFET), and uses either hardware, software, or a combination of hardware and software, to implement an active feedback voltage controller (130). The active feedback voltage controller (130) reduces the control voltage to a tracking regulator (110) which in turn reduces the power dissipation of the pass device (144) and allows for a smaller pass device to be implemented in the battery charger (100) while maintaining the desired charging current as determined by a current controller (120). With software flexibility, many types of batteries can be efficiently charged to capacity, including nickel-cadmium (NiCad), nickel-metal-hydride (NiMH), and lithium-ion (LiIon) batteries.

대표청구항 ▼

[ I claim:] [1.] A battery charger with active feedback voltage controller comprising:a pass device configured for connection between a tracking regulator and a battery pack;a current controller, coupled to the pass device, for determining a present charging current going to the battery pack and det

[ I claim:] [1.] A battery charger with active feedback voltage controller comprising:a pass device configured for connection between a tracking regulator and a battery pack;a current controller, coupled to the pass device, for determining a present charging current going to the battery pack and determining a current control value for controlling the pass device based on the present charging current; andan active feedback voltage controller, coupled to the current controller and configured for connection to the tracking regulator and the battery pack, for receiving the current control value and an actual battery voltage and determining a voltage control value to control an output voltage of the tracking regulator based on the current control value and an actual battery voltage.