PORTABLE BATTERY PACK FOR WIRELESSLY CHARGING BODY-WORN DEVICES THROUGH CLOTHING
A portable battery pack is disclosed for wirelessly powering a portable electronic device through a user's clothing. The portable battery pack includes a housing with a mating surface that includes one or more permanent magnets to facilitate mating with a portable electronic device, such as a body-worn camera.
1 . A portable battery pack, comprising:
battery cells;
a power amplifier coupled to the battery cells;
a rectifier and battery charger coupled to the battery cells;
a receiver coil coupled to the rectifier and battery charger through receiver resonant capacitors; and
a transmitter coil coupled to the power amplifier through transmitter resonant capacitors.
2 . The portable battery pack of claim 1 , wherein the power amplifier is a single-ended Class-E or Class-D power amplifier.
3 . The portable battery pack of claim 1 , wherein the power amplifier is a push-pull Class-E power amplifier.
4 . The portable battery pack of claim 1 , wherein the transmitter coil is constructed using spiral wound traces on a printed circuit board (PCB), and a shield of ferrite material is used behind the PCB to shape a magnetic field emitted by the transmitter coil.
5 . A portable battery pack, comprising:
a coil;
battery cells;
a power amplifier coupled to the battery cells;
a rectifier and battery charger coupled to the battery cells; and
a switching means configured to couple the coil to the rectifier and battery charger and disconnect the coil from the power amplifier during a charging mode of operation, and to connect the coil to the power amplifier and disconnect the coil from the rectifier and battery charger during a power transfer mode of operation.
6 . The portable battery pack of claim 5 , wherein the power amplifier is a single-ended Class-E or Class-D power amplifier.
7 . The portable battery pack of claim 5 , wherein the power amplifier is a push-pull Class-E power amplifier.
8 . The portable battery pack of claim 5 , wherein the transmitter coil is constructed using spiral wound traces on a printed circuit board (PCB), and a shield of ferrite material is used behind the PCB to shape a magnetic field emitted by the transmitter coil.
9 . A portable battery pack, comprising:
a housing having a mating surface;
one or more permanent magnets disposed on the mating surface for coupling with one or more permanent magnets on a portable electronic device;
battery cells secured within the housing;
a printed circuit board (PCB) secured within the housing, the PCB including:
a power amplifier coupled to the battery cells;
a rectifier and battery charger coupled to the battery cells;
a receiver coil coupled to the rectifier and battery charger through receiver resonant capacitors; and
a transmitter coil coupled to the power amplifier through transmitter resonant capacitors.
10 . The portable battery pack of claim 9 , wherein the transmitter coil is constructed using spiral wound traces on the PCB, and a shield of ferrite material is used behind the PCB to shape a magnetic field emitted by the transmitter coil.
11 . A portable battery pack, comprising:
a housing having a mating surface;
one or more permanent magnets disposed on the mating surface for coupling with one or more permanent magnets on a portable electronic device;
battery cells secured within the housing;
a printed circuit board (PCB) secured within the housing, the PCB including:
a power amplifier coupled to the battery cells;
a rectifier and battery charger coupled to the battery cells;
a receiver coil coupled to the rectifier and battery charger through receiver resonant capacitors; and
a coil coupled to the power amplifier; and
a switching means configured to couple the coil to the rectifier and battery charger and disconnect the coil from the power amplifier during a charging mode of operation, and to connect the coil to the power amplifier and disconnect the coil from the rectifier and battery charger during a power transfer mode of operation.
12 . The portable battery pack of claim 11 , wherein the coil is constructed using spiral wound traces on the PCB, and a shield of ferrite material is used behind the PCB to shape a magnetic field emitted by the coil.