Communication device, communication method, battery device, and electronic apparatus

A communication method for a communication device including a storage element, a voltage generating unit that is connected in parallel to the storage element and includes a transformer having a first coil on a side of the storage element and a second coil on a side of a power line, a self-inductance L1 of the first coil being higher than a self-inductance L2 of the second coil, an input blocking unit and a battery, the communication method comprising:

• outputting stored information via the power line by performing load modulation on an AC signal transmitted or received via the power line, the outputting being performed by the storage element;
• supplying voltage generated from the AC signal transmitted or received via the power line to the storage element, the supplying being performed by the voltage generating unit;
• and
• blocking, by the input blocking unit, power flowing through the power line from being input to the storage element,
• wherein the input blocking unit is connected in series with the second coil, and
• wherein the battery is connected in parallel with the series connection of the input blocking unit and the second coil, the battery configured to output DC power via the power line.

A battery device comprising:

• a battery configured to output DC power via a power line;
• a storage element configured to output stored battery information via the power line by performing load modulation on an AC signal transmitted or received via the power line;
• a voltage generating unit configured to supply voltage generated from the AC signal transmitted or received via the power line to the storage element, the voltage generating unit being connected in parallel to the storage element and including a transformer having a first coil on a side of the storage element and a second coil on a side of the power line, a self-inductance L1 of the first coil being higher than a self-inductance L2 of the second coil;
• and
• an input blocking unit, connected in series with the second coil, configured to block power flowing through the power line from being input to the storage element,
• wherein the battery is connected in parallel with the series connection of the input blocking unit and the second coil.

An electronic apparatus comprising:

• a battery device including:
• a battery configured to output DC power via a power line;
• a storage element configured to output stored battery information via the power line by performing load modulation on an AC signal transmitted or received via the power line;
• a voltage generating unit configured to supply voltage generated from the AC signal transmitted or received via the power line to the storage element, the voltage generating unit being connected in parallel to the storage element and including a transformer having a first coil on a side of the storage element and a second coil on a side of the power line, a self-inductance L1 of the first coil being higher than a self-inductance L2 of the second coil;
• and
• an input blocking unit, connected in series with the second coil, configured to block power flowing through the power line from being input to the storage element,
• wherein the battery is connected in parallel with the series connection of the input blocking unit and the second coil;
• an operating unit configured to perform a predetermined operation by using the power supplied from the battery device;
• and
• a management device configured to acquire the battery information by communicating the AC signal to the storage element via the power line, and control the power supply from the battery device to the operating unit based on the acquired battery information.