Edward Shayne Mullins

US Patent:

20120002714, Jan 5, 2012

Filed:

Jun 17, 2011

Appl. No.:

13/163513

Inventors:

Badri N. Varadarajan - Mountain View CA, US
Il Han Kim - Dallas TX, US
Anand Dabak - Plano TX, US
Edward Mullins - Sahuarita AZ, US

Assignee:

TEXAS INSTRUMENTS INCORPORATED - Dallas TX

International Classification:

H03K 7/08

US Classification:

375238

Abstract:

Systems and methods are disclosed for communicating on a pilot wire between Electric Vehicle Service Equipment (EVSE) and an Electric Vehicle (EV). The EVSE and EV exchange a Pulse Width Modulation (PWM) signal on the pilot wire to control charging operations of the EV. Data communications may also be transmitted on the pilot wire, such as between transmit and receive modems. The modems transmit communication signals either continuously, without regard to the state of the PWM signal, or only when the PWM is in an off-state. If transmitting while PWM is on, the modem needs a large coupling impedance and/or a large signal injection. To transmit only when the PWM is off, the modem may use a blocking diode in the coupling circuit or may synchronize to the pulses in the PWM signal.

US Patent:

20120068784, Mar 22, 2012

Filed:

Sep 9, 2011

Appl. No.:

13/229041

Inventors:

Badri Varadarajan - Mountain View CA, US
Edward Mullins - Sahuarita AZ, US

Assignee:

TEXAS INSTRUMENTS INCORPORATED - Dallas TX

International Classification:

H01P 1/10

US Classification:

333101

Abstract:

Coupling circuits for power line communication (PLC) devices are described. In an embodiment, a PLC device may comprise a processor and a coupling circuit coupled to the processor. The coupling circuit may in turn comprise a transmitter path and a receiver path. In some implementations, the transmitter path may include a first amplifier, a first capacitor coupled to the first amplifier, a first transformer coupled to the first capacitor, and a plurality of line interface coupling circuits coupled to the first transformer, where each of the line interface coupling circuits is configured to be connected to a different phase of an electrical power circuit. Meanwhile, the receiver path may include a plurality of capacitors, where each of the plurality of capacitors coupled to a corresponding one of the line interface circuits, a filter network coupled to the plurality of capacitors, and a second amplifier coupled to the filter network.