Patents by Inventor Chik Yam Lee
Chik Yam Lee 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).
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Patent number: 8804385Abstract: A switching converter IC without a built-in power switching device includes a first terminal serving as a power supply positive connection, a second terminal serving as a power supply return connection, a third terminal serving as the switch-driving connection for controlling the switching duty of an external bipolar or MOSFET power switching device and also serving as a conduit for detection of current drawn by the power switching device to thereby provide overcurrent protection. Feedback information is derived from voltage between the first and the second terminals.Type: GrantFiled: August 8, 2011Date of Patent: August 12, 2014Assignee: Mosway Semiconductor LimitedInventors: Chiu-Sing Celement Tse, On-Bon Peter Chan, Chik-Yam Lee, Chi-Keung Tang, Chi-Ken Kenny Lee
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Publication number: 20120049831Abstract: A switching converter IC without a built-in power switching device includes a first terminal serving as a power supply positive connection, a second terminal serving as a power supply return connection, a third terminal serving as the switch-driving connection for controlling the switching duty of an external bipolar or MOSFET power switching device and also serving as a conduit for detection of current drawn by the power switching device to thereby provide overcurrent protection. Feedback information is derived from voltage between the first and the second terminals.Type: ApplicationFiled: August 8, 2011Publication date: March 1, 2012Inventors: Chiu-Sing Celement Tse, On-Bon Peter Chan, Chik-Yam Lee, Chi-Keung Tang, Chi-Ken Kenny Lee
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Patent number: 7465610Abstract: A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.Type: GrantFiled: August 14, 2006Date of Patent: December 16, 2008Assignee: International Rectifier CorporationInventors: Bruno C. Nadd, Vincent Thiery, Xavier de Frutos, Chik Yam Lee
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Patent number: 7265603Abstract: A circuit for preventing shoot-through in a high side switching transistor coupled in series with a low side switching transistor across a supply voltage, the circuit comprising a voltage reference circuit having an output providing a reference voltage which is negative with respect to the supply voltage provided to the high side switching transistor, the reference voltage being applied to the control electrode of the high side switching transistor when the high side switching transistor is off and the source of the high side switching transistor exceeds the reference voltage and the low side switching transistor is on.Type: GrantFiled: December 23, 2003Date of Patent: September 4, 2007Assignee: International Rectifier CorporationInventors: Chik Yam Lee, Vincent Thiery
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Patent number: 7164308Abstract: A bandgap voltage reference circuit comprising a first circuit providing a first voltage representative of to Vbe of a first bipolar transistor, a second circuit providing a second voltage ?Vbe representative of the difference of two Vbe voltages of two bipolar transistors, and a comparator having respective inputs receiving voltages representative of Vbe and ?Vbe and an output coupled to the base of the first bipolar transistor whereby a voltage representative of the sum of respective constants multiplying Vbe and ?Vbe is provided at the output of the comparator.Type: GrantFiled: November 14, 2003Date of Patent: January 16, 2007Assignee: International Rectifier CorporationInventor: Chik Yam Lee
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Patent number: 7115922Abstract: A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.Type: GrantFiled: April 7, 2004Date of Patent: October 3, 2006Assignee: International Rectifier CorporationInventors: Bruno C Nadd, Vincent Thiery, Xavier de Frutos, Chik Yam Lee
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Patent number: 7064946Abstract: An electronic fuse comprising an integrated circuit having a control output terminal coupled to a control electrode of a power semiconductor switching device, the power semiconductor switching device being coupled in series with a load between first and second potentials, the integrated circuit further comprising a current sense input for sensing the current through the power semiconductor switching device, the integrated circuit further comprising a driver circuit for driving the power semi-conductor switching device, the driver circuit being coupled to a current limiting circuit responsive to the sensed current in the power semiconductor switching device, the current limiting circuit controlling the driver circuit whereby if the current through the power semiconductor switching device exceeds a predetermined threshold, the current limiting circuit generates a command to pulse the power semiconductor switching device on and off in a period of pulsed operation to maintain the current in the power semiconductoType: GrantFiled: December 18, 2003Date of Patent: June 20, 2006Assignee: International Rectifier CorporationInventors: Vincent Thiery, Bruno C. Nadd, Chik Yam Lee
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Patent number: 6856177Abstract: A power switching circuit comprising a power semiconductor switching device, a charge pump circuit having a control input to control whether it is on or off and a charge pump output, the charge pump output being coupled to a control terminal of the power semiconductor switching device, a bootstrap power supply for supplying power to driver circuitry for the power semiconductor switching device, the bootstrap power supply comprising a bootstrap capacitor coupled to a charging current source, the bootstrap power supply providing power to the driver circuitry when the power semiconductor switching device is being switched by the driver circuitry in a pulsed mode, and the charge pump supplying a control voltage to turn on the power semiconductor switching device and maintain it on when the power switching semiconductor device is to be maintained on continuously.Type: GrantFiled: July 22, 2003Date of Patent: February 15, 2005Assignee: International Rectifier CorporationInventors: Xavier de Frutos, Bruno C. Nadd, Vincent Thiery, Chik Yam Lee
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Publication number: 20040227193Abstract: A circuit for preventing shoot-through in a high side switching transistor coupled in series with a low side switching transistor across a supply voltage, the circuit comprising a voltage reference circuit having an output providing a reference voltage which is negative with respect to the supply voltage provided to the high side switching transistor, the reference voltage being applied to the control electrode of the high side switching transistor when the high side switching transistor is off and the source of the high side switching transistor exceeds the reference voltage and the low side switching transistor is on.Type: ApplicationFiled: December 23, 2003Publication date: November 18, 2004Applicant: International Rectifier CorporationInventors: Chik Yam Lee, Vincent Thiery
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Publication number: 20040189229Abstract: A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.Type: ApplicationFiled: April 7, 2004Publication date: September 30, 2004Applicant: International Rectifier CorporationInventors: Bruno C. Nadd, Vincent Thiery, Xavier de Frutos, Chik Yam Lee
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Publication number: 20040140844Abstract: A bandgap voltage reference circuit comprising a first circuit providing a first voltage substantially proportional to Vbe of a first bipolar transistor, a second circuit providing a second voltage &Dgr;Vbe substantially proportional to the difference of two Vbe voltages of two bipolar transistors, and a comparator having respective inputs coupled to Vbe and &Dgr;Vbe and an output coupled to the base of the first bipolar transistor whereby a voltage substantially proportional to the sum of respective constants multiplying Vbe and &Dgr;Vbe is provided at the output of the comparator.Type: ApplicationFiled: November 14, 2003Publication date: July 22, 2004Applicant: International Rectifier CorporationInventor: Chik Yam Lee
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Patent number: 6747300Abstract: A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.Type: GrantFiled: March 4, 2002Date of Patent: June 8, 2004Assignee: Ternational Rectifier CorporationInventors: Bruno C. Nadd, Vincent Thiery, Xavier de Frutos, Chik Yam Lee
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Publication number: 20030164545Abstract: A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.Type: ApplicationFiled: March 4, 2002Publication date: September 4, 2003Applicant: International Rectifier Corp.Inventors: Bruno C. Nadd, Vincent Thiery, Xavier DeFrutos, Chik Yam Lee
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Patent number: 5899931Abstract: An active implanted medical device, particularly an active implantable medical device, and its external programmer having a bi-directional synchronous transmission of data. The active implanted medical device (10) includes a timing clock (18) and circuits for the emission/reception of signals operating under the temporal control of the timing clock of the active implanted medical device. The programmer (24) includes a timing clock (42) and circuits for the emission/reception of signals, operating under the temporal control of the programmer timing clock.Type: GrantFiled: June 4, 1997Date of Patent: May 4, 1999Assignee: ELA Medical S.A.Inventors: Herve Deschamp, Chik Yam Lee
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Patent number: 5891184Abstract: A device for filtering signals emitted by a medical device, principally an active implanted medical device. The device (26) receives an input that is a signal delivered by a circuit (16-24) that receives signals emitted by a medical device (10) in the form of a magnetic induction, in which the medical device has a metallic housing or case. A compensation stage (42) also is provided, having in the frequency domain a transfer function in the form: ##EQU1## where f.sub.c is a chosen parameter according to the geometry and the material of the metallic case of the medical device (10), and where j=.sqroot.-1. The device is useful with medical devices that emit sequences of messages formed by symbols belonging to an alphabet of n symbols (n.gtoreq.2), the compensation stage being able to reduce the rate of inter-symbol interference of collected signals that are applied to it.Type: GrantFiled: June 4, 1997Date of Patent: April 6, 1999Assignee: ELA Medical, S.A.Inventors: Chik Yam Lee, Herve Deschamp
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Patent number: 5741315Abstract: A device for the reception of signals emitted by an active implanted medical device. The device has a signal collector coil for the reception of a magnetic induction which receives a useful signal component (B.sub.s) emitted by the implanted device (26) and a parasitic signal component (B.sub.p) of external origin. There is at least one collecting coil (12) wound on a first portion (14) of a magnetic circuit and at least one compensation coil (22) wound on a second portion (20) of the magnetic circuit, the two portions of the magnetic circuit belonging to a common magnetic element (16) and being configured in a manner such that, when the device is disposed in face of the implanted device, the collecting coil is essentially crossed one time by the magnetic induction field lines of the useful signal component (B.sub.Type: GrantFiled: March 21, 1997Date of Patent: April 21, 1998Assignee: ELA Medical S.A.Inventors: Chik Yam Lee, Herve Deschamp
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Patent number: 5388586Abstract: A circuit for use in an implantable cardiac pacemaker for use in processing intracardiac signals and methods of processing such signals. The circuit includes a passive filter 1 has a bandwidth of 0.1 to 80 Hz approximately. An amplifier 2 with switched capacitors presents at the output a dynamics of 0.8V approximately and a gain lower than 50. An analog-to-digital converter 3 with delta modulation, which is controllably variable in step and functions at two frequencies, one of 1 kHz approximately, the other of 4 kHz approximately. The circuit may be used for both processing said signals to identify spontaneous cardiac events and to telemeter an intracardiac ECG.Type: GrantFiled: December 23, 1993Date of Patent: February 14, 1995Assignee: ELA MedicalInventors: Chik-Yam Lee, Laurent Claudon, Renzo D. Molin