Patents by Inventor Allwyn Jacob D'Cunha

Allwyn Jacob D'Cunha 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: 7826239
    Abstract: Disclosed is an overload protection delay circuit for use in a switching power supply for enabling the switching power supply to detect overload problems with high accuracy. The overload protection delay circuit is connected between a photo coupler and a pulse-width modulator of the switching power supply, and is consisted of an energy storage device such as a capacitor and a charging controller such as a zener diode. The charging controller is configured to set a limit value for allowing the energy storage device to be charged by an internal current source of the pulse-width modulator when the feedback signal of the switching power supply reaches the limit value. By charging the energy storage device, a time delay is added to the feedback signal so that the pulse-width modulator can accurately activate the internal overload protection mechanism without the interference of load transients.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: November 2, 2010
    Assignee: Delta Electronics (Thailand) Public Company, Limited
    Inventors: Chalermkiat Tepsumran, Allwyn Jacob D. Cunha, Apinun Pomta
  • Publication number: 20080239607
    Abstract: Disclosed is an overload protection delay circuit for use in a switching power supply for enabling the switching power supply to detect overload problems with high accuracy. The overload protection delay circuit is connected between a photo coupler and a pulse-width modulator of the switching power supply, and is consisted of an energy storage device such as a capacitor and a charging controller such as a zener diode. The charging controller is configured to set a limit value for allowing the energy storage device to be charged by an internal current source of the pulse-width modulator when the feedback signal of the switching power supply reaches the limit value. By charging the energy storage device, a time delay is added to the feedback signal so that the pulse-width modulator can accurately activate the internal overload protection mechanism without the interference of load transients.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Applicant: Delta Electronics (Thailand) Public Co., Ltd.
    Inventors: Chalermkiat Tepsumran, Allwyn Jacob D. Cunha, Apinun Pomta
  • Patent number: 7289342
    Abstract: There is provided an output voltage stabilizer for stabilizing an output voltage of a switching mode power supply by elimination power bounce appearing on the output voltage of the switching mode power supply. The output voltage stabilizer mainly includes a voltage comparator that compares a rectified DC voltage obtained by the rectification of an input AC voltage with a reference voltage and in response thereto generates an output signal, and a control switch that is biased according to the output signal of the voltage comparator and provides the power supply a drive signal to stabilize an output voltage of the power supply during the brownout or soft-start stage in the input AC voltage.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: October 30, 2007
    Assignees: Delta Electronics, Inc., Delta Electronics (Thailand) Public Company Limited
    Inventors: Allwyn Jacob D'Cunha, Piyaphong Bumroongsawad
  • Publication number: 20060203520
    Abstract: There is provided an output voltage stabilizer for stabilizing an output voltage of a switching mode power supply by elimination power bounce appearing on the output voltage of the switching mode power supply. The output voltage stabilizer mainly includes a voltage comparator that compares a rectified DC voltage obtained by the rectification of an input AC voltage with a reference voltage and in response thereto generates an output signal, and a control switch that is biased according to the output signal of the voltage comparator and provides the power supply a drive signal to stabilize an output voltage of the power supply during the brownout or soft-start stage in the input AC voltage.
    Type: Application
    Filed: May 4, 2006
    Publication date: September 14, 2006
    Inventors: Allwyn Jacob D'Cunha, Piyaphong Bumroongsawad
  • Publication number: 20050140337
    Abstract: A charging apparatus is used to charge the electronic device, wherein the electronic device can generate a control signal to switch the conducting paths within the charging apparatus. The charging apparatus includes an input terminal for receiving a first type of electric power, an output terminal for coupling to the electronic device, a transducer for converting the first type of electric power into a second type of electric power, an energy storage element for storing the second type of electric power and/or providing the second type of electric power stored therein, and a relay circuit electrically connected to the transducer, the energy storage element and the output terminal, and is configured to materialize a first conducting path to charge the electronic device by the electric power from the transducer, or materialize a second conducting path to charge the electronic device by the electric power stored in the energy storage element.
    Type: Application
    Filed: June 17, 2004
    Publication date: June 30, 2005
    Inventors: Allwyn Jacob D' Cunha, Pornchai Lalitnuntikul
  • Patent number: 6867575
    Abstract: There is disclosed a switching mode power supply with a reduced EMI effect, comprising a rectifier for converting an AC power supplied by an AC power source into a rectified DC power, a transformer coupled to the rectifier for inputting the DC power from a primary winding and inducing a rectified power to a secondary winding through the primary winding, a switch unit connected in series with the primary winding for converting the DC power supplied to the primary winding into AC power by on/off operations, an output voltage feedback control circuit for providing pulses to drive the switch unit by controlling a switching duty cycle of the switching unit, and a power line filter including a unidirectional current-limiting device such as a diode for reducing differential mode noise appearing between a live supply line and a neutral line from the alternating current power source.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: March 15, 2005
    Assignees: Delta Electronics, Inc., Delta Electronics (Thailand) Public Company Limited
    Inventor: Allwyn Jacob D'Cunha
  • Publication number: 20040141338
    Abstract: There is provided an output voltage stabilizer for stabilizing an output voltage of a switching mode power supply by elimination power bounce appearing on the output voltage of the switching mode power supply. The output voltage stabilizer mainly includes a voltage comparator that compares a DC voltage with a reference voltage and in response thereto generates an output signal, and a control switch that is biased according to the output signal of the voltage comparator and provides the power supply a drive signal to stabilize an output voltage of the power supply according to an on/off state of the control switch.
    Type: Application
    Filed: January 17, 2003
    Publication date: July 22, 2004
    Applicants: DELTA ELECTRONICS, INC., Delta Electronics (Thailand) Public Company, Limited of Samutprakarn
    Inventors: Allwyn Jacob D' Cunha, Piyaphong Bumroongsawad
  • Publication number: 20040109333
    Abstract: There is disclosed a switching mode power supply with a reduced EMI effect, comprising a rectifier for converting an AC power supplied by an AC power source into a rectified DC power, a transformer coupled to the rectifier for inputting the DC power from a primary winding and inducing a rectified power to a secondary winding through the primary winding, a switch unit connected in series with the primary winding for converting the DC power supplied to the primary winding into AC power by on/off operations, an output voltage feedback control circuit for providing pulses to drive the switch unit by controlling a switching duty cycle of the switching unit, and a power line filter including a unidirectional current-limiting device such as a diode for reducing differential mode noise appearing between a live supply line and a neutral line from the alternating current power source.
    Type: Application
    Filed: December 6, 2002
    Publication date: June 10, 2004
    Inventor: Allwyn Jacob D'Cunha