An integrated power supply and battery charger (1) with interchangeable and collapsible plug includes a casing (1), an electrical plug detachably mounted in the casing (1) and including collapsible prongs, allowing the user to accommodate myriads of combinations of power source configurations, electrical devices and rechargeable batteries. Releasable locking mechanisms are included to both engage the interchangeable electrical plug and battery and to lock the prong in the extended position. A variety of plugs can be fitted to the same casing (1). A power supply is preferably fitted within the casing (1), allowing an electrical device (8) to be attached while the device is also acting as a battery charger.

Universally interchangeable and modular power supply with integrated battery charger

The present disclosure includes apparatuses and methods related to comparing data patterns in memory. An example method can include comparing a number of data patterns stored in a memory array to a target data pattern. The method can include determining whether a data pattern of the number of data patterns matches the target data pattern without transferring data from the memory array via an input/output (I/O) line.

Apparatuses and methods for comparing data patterns in memory

In a radio telephone apparatus including a host phone unit, a cordless extension unit connected by radio waves to the host phone unit, and a charger unit for charging the cordless extension unit, a phone number inputting keyboard is provided in the charger unit.

Radio phone apparatus having compact cordless extension unit

A switching circuit (30) in a portable telephone connects a gate of a field-effect transistor (Q1) to a voltage below the transistor's gate threshold voltage when the voltage at a first power source terminal (B) falls below a threshold voltage, thus disconnecting the first power source terminal (B) from a portable telephone power input terminal (B+) and connecting a second power source terminal (A) to the power input terminal (B+). The threshold voltage is set at a voltage above the minimum supply voltage of the portable telephone. The first power source terminal may be connected to a main battery and the second power source terminal may be connected to an adapter such as a battery eliminator adapter, hands-free adapter, or mobile transceiver adapter. This switching circuit prevents a call in progress from being disconnected when power sources are exchanged during a GSM burst.

External power source to main battery power sources switch

In a wait state of a portable telephone terminal or a state in which processors and the like are not in full operation, power is supplied from a series power supply. When the processors and the like are in a busy operating condition, power is supplied from a DC/DC converter While the series power supply supplies power, operation of the DC/DC converter is stopped.

Portable telephone terminal and power supply method

In order to reduce volume and weight of a power supply of a compact portable telephone set and thus reduce volume and weight of the compact portable telephone set itself, a P-channel power MOSFET is used as a power switching element, and a negative voltage, for example, -11 volts is applied across a source and a gate from a DC/DC converter to turn on the P-channel power MOSFET so that power is supplied from a battery 2 which serves as one power supply. When the gate and the source of the power MOSFET are maintained at the same potential, the power MOSFET is turned off and power is supplied from another power supply.

Asako Nakamura

Papers

Power supply switching circuit for a compact portable telephone set