Patents by Inventor Alan James Dodd

Alan James Dodd has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8659278
    Abstract: A switching regulator (2-5) supplies a controllable stable average current to a load (1), such as series-connected light emitting diodes. A regulator controller (2) includes a hysteretic comparator (12, 30) which controls a switch in the form of a transistor (15) for switching current into an inductor (3). The comparator (12) has upper and lower thresholds. A first circuit comprising a fast current monitor (6) supplies a first signal to the comparator representing the instantaneous current in the inductor (3). A second circuit (36, 37, 41, and 42) supplies a second signal to the comparator representing an error between a desired regulator output and an actual regulator output.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: February 25, 2014
    Assignee: Diodes Zetex Semiconductors Limited
    Inventors: Rohit Arora, Alan James Dodd, Craig Maurice Taylor
  • Publication number: 20100244801
    Abstract: A switching regulator (2-5) supplies a controllable stable average current to a load (1), such as series-connected light emitting diodes. A regulator controller (2) includes a hysteretic comparator (12, 30) which controls a switch in the form of a transistor (15) for switching current into an inductor (3). The comparator (12) has upper and lower thresholds. A first circuit comprising a fast current monitor (6) supplies a first signal to the comparator representing the instantaneous current in the inductor (3). A second circuit (36, 37, 41, and 42) supplies a second signal to the comparator representing an error between a desired regulator output and an actual regulator output.
    Type: Application
    Filed: March 22, 2010
    Publication date: September 30, 2010
    Applicant: DIODES ZETEX SEMICONDUCTORS LIMITED
    Inventors: Rohit Arora, Alan James Dodd, Craig Maurice Taylor
  • Patent number: 7245174
    Abstract: A switching circuit (20) comprising first and second switch terminals (2,3) and a switch (21). The switch (21) comprises a first bipolar transistor (22), having a collector connected to the first switch terminal (2) and an emitter connected to the second switch terminal (3), and a second bipolar transistor (23), having an emitter connected to the first switch terminal (2) and a collector connected to the second switch terminal (3). The switch (21) can be turned on by supply of a control current to the base of either the first or the second bipolar transistor.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: July 17, 2007
    Assignee: Zetex PLC
    Inventors: Alan James Dodd, Joseph Andrew Jenkins, Anthony Philip Sullivan