Power supply device and electronic device

Patent metadata

Field	Value
Publication number	US-10007313-B2
Application number	US-201615171140-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Feb 19, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

An electronic device allows a user to exchange a main battery in a state where an electronic device is continuously operated, even when a backup battery is a small-sized battery charger. The power supply device supplies power for driving an electronic device, and includes a first battery used as a driving power supply, a second battery used as the driving power supply when the first battery is unusable, a booster circuit that increases an output voltage of the second battery, a dummy load circuit for the booster circuit, a battery detachment detector that detects whether the first battery is detachable from the device, and a power controller that switches the driving power supply of the device to the first or second battery. The power controller activates the booster circuit and supplies output power of the booster circuit to the dummy load circuit, when the first battery is detachable.

First claim

What is claimed is:

1. A power supply device for supplying power for driving an electronic device, the power supply device comprising:
a first battery used as a driving power supply of the electronic device;
a second battery used as the driving power supply in place of the first battery when the first battery is unusable;
a booster circuit that increases an output voltage of the second battery;
a dummy load circuit that is a load to the booster circuit;
a battery detachment detector that detects whether or not the first battery is detachable from the electronic device; and
a power controller that switches the driving power supply of the electronic device to the first battery or the second battery,
wherein the power controller activates the booster circuit and supplies output power of the booster circuit to the dummy load circuit, when the battery detachment detector detects that the first battery is detachable, and
the power controller controls a connection of the dummy load circuit to suppress a voltage drop of the output power of the booster circuit, the voltage drop occurring when connecting the electronic device to the power supply device.

2. The power supply device according to claim 1 , wherein
the electronic device includes a battery lock knob that locks detachment operation of the first battery, and
the battery detachment detector detects that the first battery is detachable from the electronic device by detecting release of the battery lock knob.

3. The power supply device according to claim 1 , wherein
the power controller performs control such that the driving power supply is switched from the first battery to the second battery, based on a voltage difference between an output voltage of the first battery and the output voltage of the second battery.

4. The power supply device according to claim 3 , wherein
the power controller performs control such that the supply of the output power of the booster circuit to the dummy load circuit is stopped, after the driving power supply is switched from the first battery to the second battery.

5. The power supply device according to claim 1 , wherein
a battery capacity of the second battery is smaller than a battery capacity of the first battery.

6. An electronic device comprising the power supply device according to claim 1 .

7. The electronic device according to claim 6 , comprising an LED indicating a detachable or undetachable state of the first battery by a luminescent color.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Nishimura Toshiro

Classifications

• H02J9/061

  for DC powered loads · CPC title

• H02J1/102

  being switching converters (H02J1/108, H02J1/12 take precedence) · CPC title

• H02J1/001

  Hot plugging or unplugging of load or power modules to or from power distribution networks · CPC title

• H02J7/34

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title

• G06F1/1635

  Details related to the integration of battery packs and other power supplies such as fuel cells or integrated AC adapter · CPC title