Patents by Inventor Leonardus A. De Groot

Leonardus A. De Groot 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: 6674268
    Abstract: A switching circuit for switching an input dc voltage of predetermined polarity is used, for example, for a synchronous dc-dc converter. The switching circuit is divided between a high side package (52) and a low side package (56) each having a logic input (90) and a switch (6,8) connected between switching outputs (84,86). The switching outputs (84,86) of the high and low side packages (52,56) are connected in series between input voltage terminals (4,2). A pulse width modulator (18) is connected to the logic inputs (90) of the packages for supplying an alternating control signal for switching the high and low side switches (6,8) alternately. Each of the high and low side packages (52,56) contains logic circuitry (150) for controlling the respective switch (6,8) based solely on the voltages on the respective logic input (90) and respective switching outputs (84,86) to prevent the switches (6,8) in the high and low side packages (52,56) from conducting at the same time.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: January 6, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Philip Rutter, Leonardus A. De Groot, Nicolas J. Wheeler
  • Patent number: 6661208
    Abstract: A synchronous dc—dc converter converts an input dc voltage to an output dc voltage. A control FET (6) and a sync FET (8) are connected in series between input dc voltage terminals (2,4). An alternating control signal input from a control circuit (18) controls the control and sync FETs (6,8) to be switched on alternately. At least one driver (30, 32) is provided to drive the FETs (6,8). In response to a change in the alternating control signal of a predetermined polarity, the driver (32) switches off the sync FET (8), and then the driver (30) waits for the trigger signal before switching on the control FET (6).
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: December 9, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Philip Rutter, Leonardus De Groot, Nicolas J. Wheeler
  • Patent number: 6603291
    Abstract: An integrated driver circuit includes a low side component and a synchronous dc voltage converter circuit. A sync FET (8) is controlled by a driver (32) powered between high and low voltage power connections (134, 138). A timing circuit (150) controls the driver circuit in accordance with a signal on a control input. The driver circuit (32) is isolated from the timing circuit (150), for example by a level shift circuit (136) and the low voltage power connection (138) of the driver circuit is directly connected to the source (108) of the sync FET (8). This arrangement is intended to reduce transient voltage effects.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: August 5, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Nicolas J. Wheeler, Leonardus A. De Groot, Philip Rutter
  • Publication number: 20020175661
    Abstract: The invention relates to a low side component and a synchronous dc voltage converter circuit. A sync FET (8) is controlled by a driver (32) powered between high and low voltage power connections (134, 138). A timing circuit (150) controls the driver circuit in accordance with a signal on a control input. The driver circuit (32) is isolated from the timing circuit (150), for example by a level shift circuit (136) and the low voltage power connection (138) of the driver circuit is directly connected to the source (108) of the sync FET (8). This may reduce transient voltage effects.
    Type: Application
    Filed: February 4, 2002
    Publication date: November 28, 2002
    Applicant: Koninklijke Philips Electronics N.V.
    Inventors: Nicolas J. Wheeler, Leonardus A. De Groot, Philip Rutter
  • Publication number: 20020105311
    Abstract: A switching circuit for switching an input dc voltage of predetermined polarity is used, for example, for a synchronous dc-dc converter. The switching circuit is divided between a high side package (52) and a low side package (56) each having a logic input (90) and a switch (6,8) connected between switching outputs (84,86). The switching outputs (84,86) of the high and low side packages (52,56) are connected in series between input voltage terminals (4,2). A pulse width modulator (18) is connected to the logic inputs (90) of the packages for supplying an alternating control signal for switching the high and low side switches (6,8) alternately. Each of the high and low side packages (52,56) contains logic circuitry (150) for controlling the respective switch (6,8) based solely on the voltages on the respective logic input (90) and respective switching outputs (84,86) to prevent the switches (6,8) in the high and low side packages (52,56) from conducting at the same time.
    Type: Application
    Filed: February 6, 2002
    Publication date: August 8, 2002
    Applicant: Koninklikje Philips Electronics N.V.
    Inventors: Philip Rutter, Leonardus A. De Groot, Nicolas J. Wheeler
  • Publication number: 20020105309
    Abstract: A synchronous dc-dc converter converts an input dc voltage to an output dc voltage. A control FET (6) and a sync FET (8) are connected in series between input dc voltage terminals (2,4). An alternating control signal input from a control circuit (18) controls the control and sync FETs (6,8) to be switched on alternately. At least one driver (30, 32) is provided to drive the FETs (6,8). In response to a change in the alternating control signal of a predetermined polarity, the driver (32) switches off the sync FET (8), and then the driver (30) waits for the trigger signal before switching on the control FET (6).
    Type: Application
    Filed: February 4, 2002
    Publication date: August 8, 2002
    Applicant: Koninklijke Philips Electronics N.V.
    Inventors: Philip Rutter, Leonardus A. De Groot, Nicolas J. Wheeler
  • Patent number: 6175225
    Abstract: A dc—dc converter comprises first (5) and second (6) transistor switches connected in series between a dc input (1) and ground (4). The converter includes an inductor connecting the junction (8) of the two switches to a dc output and also a capacitor connecting the dc output to ground. The switches are closed alternately in response to a switching signal applied to a switching signal input (3), thereby alternately charging the capacitor from the dc input through the first switch and the inductor and discharging the energy stored in the inductor into the capacitor via the second switch. The coupling (12) from the switching signal input to the control input (25) of the second switch is provided with a threshold-responsive disable signal input (13) which is connected to the junction (8) between the two switches, for preventing the second switch from being controlled to a closed state at any time that the voltage on the junction is above a predetermined threshold.
    Type: Grant
    Filed: June 29, 2000
    Date of Patent: January 16, 2001
    Assignee: U.S. Philips Corporation
    Inventor: Leonardus A. De Groot