Patents by Inventor Yong Siang Teo

Yong Siang Teo 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: 10516338
    Abstract: Voltage converter controllers, voltage converters and methods are discussed regarding the adjustment of an on-time of an auxiliary switch of a voltage converter. First and second voltages are measured before a primary switch of the voltage converter is turned on and while the primary switch is turned on, and the on-time is adjusted based on the voltages.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: December 24, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Xiaowu Gong, Gerald Deboy, Yong Siang Teo, Zan Wang
  • Patent number: 10374508
    Abstract: An example method includes storing a peak voltage level, a valley voltage level, and a frequency of a signal that corresponds to an alternating current (AC) signal across a capacitor; periodically determining whether a current peak voltage level of the signal is different than the stored peak voltage level of the signal or a current valley voltage level of the signal is different than the stored valley voltage level of the signal; determining, based on whether the current peak voltage level of the signal is different than the stored peak voltage level or the current valley voltage level of the signal is different than the stored valley voltage level, whether the AC signal has been removed from the capacitor; and in response to determining that the AC signal has been removed from the capacitor, discharging the capacitor.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: August 6, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Xiaowu Gong, Siu Kam Kok, Yong Siang Teo
  • Publication number: 20190149052
    Abstract: Voltage converter controllers, voltage converters and methods are discussed regarding the adjustment of an on-time of an auxiliary switch of a voltage converter. First and second voltages are measured before a primary switch of the voltage converter is turned on and while the primary switch is turned on, and the on-time is adjusted based on the voltages.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 16, 2019
    Inventors: Xiaowu Gong, Gerald Deboy, Yong Siang Teo, Zan Wang
  • Patent number: 10291132
    Abstract: An integrated circuit may detect a pin voltage at a selector pin. The integrated circuit may compare the pin voltage to a threshold voltage. The integrated circuit may selectively perform primary side voltage regulation or secondary side voltage regulation, to regulate a voltage supplied to an electrical load coupled to the integrated circuit, based on comparing the pin voltage and the threshold voltage.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: May 14, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Siu Kam Kok, Tuck Meng Chan, Yong Siang Teo
  • Patent number: 10153702
    Abstract: Circuits and methods within a switched-mode power supply (SMPS) controller are provided. The SMPS controller includes an SMPS power stage which is integrated within the same package, and which has a first power switch. The first power switch is used to supply current to a power supply for the SMPS controller during a start-up phase of the SMPS, thereby charging this power supply prior to normal operational mode of the SMPS. A lead of the SMPS controller is connected to a control terminal of the first power switch during the start-up phase. After the start-up phase, this same lead is instead routed to an input source voltage monitor, and is used for detecting overvoltage or undervoltage conditions at the SMPS input power source.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: December 11, 2018
    Assignee: Infineon Technologies Austria AG
    Inventors: Yong Siang Teo, Xiaowu Gong, Kok Kee Lim
  • Publication number: 20180226894
    Abstract: Circuits and methods within a switched-mode power supply (SMPS) controller are provided. The SMPS controller includes an SMPS power stage which is integrated within the same package, and which has a first power switch. The first power switch is used to supply current to a power supply for the SMPS controller during a start-up phase of the SMPS, thereby charging this power supply prior to normal operational mode of the SMPS. A lead of the SMPS controller is connected to a control terminal of the first power switch during the start-up phase. After the start-up phase, this same lead is instead routed to an input source voltage monitor, and is used for detecting overvoltage or undervoltage conditions at the SMPS input power source.
    Type: Application
    Filed: February 7, 2017
    Publication date: August 9, 2018
    Inventors: Yong Siang Teo, Xiaowu Gong, Kok Kee Lim
  • Patent number: 9948187
    Abstract: In accordance with an embodiment, a method of operating a switched-mode power supply includes turning on a semiconductor switch coupled to a primary winding of a transformer for a first time period of a first cycle, turning off the semiconductor switch for a second time period of the first cycle, detecting a change in slew rate of a voltage at an output node of the semiconductor switch, determining a switch turn-on time based on detecting the change in the slew rate, and turning on the semiconductor switch at the determined switch turn-on time for a first time period of a second cycle.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: April 17, 2018
    Assignee: Infineon Technologies Austria AG
    Inventors: Xiao Wu Gong, Yong Siang Teo
  • Patent number: 9941726
    Abstract: In some examples, a circuit is configured to receive an input signal and deliver, based on the input signal, a charging current to a capacitor. The circuit may be further configured to receive an output voltage that indicates a charge on the capacitor. The circuit may be further configured to determine that the output voltage is shorted to a reference ground. The circuit may be further configured to reduce, based on determining that the output voltage is shorted to the reference ground, the charging current.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: April 10, 2018
    Assignee: Infineon Technologies Austria AG
    Inventors: Xiaowu Gong, Yong Siang Teo
  • Publication number: 20180026626
    Abstract: A device driver is described that includes an output stage and one or more control components. The output stage is configured to produce a gate driver output for driving a gate terminal of a semiconductor device, the output stage comprising a variable driving capability. The one or more control components are configured to obtain an indication of a rise time of the gate driver output during an initial switching cycle of the semiconductor device, and prior to a subsequent switching cycle of the semiconductor device, adjust, based on the indication of the rise time, a driving capability of the device driver from a first level to a second level. The one or more control components are further configured to cause the output stage to output the gate driver output at the second level of driving capability during the subsequent switching cycle of the semiconductor device.
    Type: Application
    Filed: July 25, 2016
    Publication date: January 25, 2018
    Inventors: Yong Siang Teo, Xiaowu Gong
  • Patent number: 9825535
    Abstract: Techniques are described to adjust an amount of time a switch is turned off to control power delivered to a load. In some examples, the amount of time the switch is off includes a delay count value and a set count value based on an output power level. In some examples, the amount of time the switch is off includes a zero crossing delay value based on the input voltage level. Both of these example techniques increase the switching efficiency of the system.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: November 21, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Yong Siang Teo, Xiaowu Gong, Siu Kam Kok
  • Publication number: 20170310121
    Abstract: In some examples, a circuit is configured to receive an input signal and deliver, based on the input signal, a charging current to a capacitor. The circuit may be further configured to receive an output voltage that indicates a charge on the capacitor. The circuit may be further configured to determine that the output voltage is shorted to a reference ground. The circuit may be further configured to reduce, based on determining that the output voltage is shorted to the reference ground, the charging current.
    Type: Application
    Filed: April 21, 2016
    Publication date: October 26, 2017
    Inventors: Xiaowu Gong, Yong Siang Teo
  • Patent number: 9763289
    Abstract: In accordance with an embodiment, a switched-mode power converter includes a switch, a freewheeling diode coupled between an output terminal of the switch and a power supply input node, an inductor coupled between the output terminal of the switch and a power supply output node, and a passive network having a first terminal coupled to the output terminal of the switch, a second terminal coupled to a power supply output node, and a third terminal coupled to a reference terminal of the switch. A method includes measuring a first voltage at a fourth terminal of the passive network when the switch is on; measuring a second voltage at the fourth terminal of the passive network when the switch is off; and estimating an output voltage between the power supply output node and the reference terminal of the switch based on the first voltage and the second voltage.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: September 12, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Michael Herfurth, Xiao Wu Gong, Yong Siang Teo
  • Patent number: 9703310
    Abstract: Representative implementations of devices and techniques provide a reduction in the spread of a bandgap voltage of a bandgap reference circuit. The biasing current for a target bipolar device is conditioned by passing it through one or more like bipolar devices prior to biasing the target bipolar device.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: July 11, 2017
    Assignee: Infineon Technologies Austria AG
    Inventor: Yong Siang Teo
  • Publication number: 20170187217
    Abstract: An example method includes storing a peak voltage level, a valley voltage level, and a frequency of a signal that corresponds to an alternating current (AC) signal across a capacitor; periodically determining whether a current peak voltage level of the signal is different than the stored peak voltage level of the signal or a current valley voltage level of the signal is different than the stored valley voltage level of the signal; determining, based on whether the current peak voltage level of the signal is different than the stored peak voltage level or the current valley voltage level of the signal is different than the stored valley voltage level, whether the AC signal has been removed from the capacitor; and in response to determining that the AC signal has been removed from the capacitor, discharging the capacitor.
    Type: Application
    Filed: December 28, 2015
    Publication date: June 29, 2017
    Inventors: Xiaowu Gong, Siu Kam Kok, Yong Siang Teo
  • Publication number: 20170163151
    Abstract: Methods, devices, techniques, systems, and integrated circuits are disclosed for variably controlling a switch on time for a driver, which may enhance iTHD. In one example, a device includes an input voltage sensor configured to detect an input voltage, and a variable switch on time generator, operatively connected to the input voltage sensor to receive a signal indicative of the input voltage. The variable switch on time generator is configured to determine a variable switch on time based at least in part on the detected input voltage, and output the determined variable switch on time for controlling switch on timing of a driver switch.
    Type: Application
    Filed: December 3, 2015
    Publication date: June 8, 2017
    Inventors: Yong Siang Teo, Xiaowu Gong
  • Patent number: 9673709
    Abstract: Methods, devices, techniques, systems, and integrated circuits are disclosed for variably controlling a switch on time for a driver, which may enhance iTHD. In one example, a device includes an input voltage sensor configured to detect an input voltage, and a variable switch on time generator, operatively connected to the input voltage sensor to receive a signal indicative of the input voltage. The variable switch on time generator is configured to determine a variable switch on time based at least in part on the detected input voltage, and output the determined variable switch on time for controlling switch on timing of a driver switch.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: June 6, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Yong Siang Teo, Xiaowu Gong
  • Patent number: 9601992
    Abstract: This disclosure relates to a switching power supply with regulated voltage suppression to reduce transformer audio noise. The switching power supply is operable to be fed a zero crossing voltage and to generate an output voltage. The output voltage may have a voltage level set using a modulated gate signal. A circuit is provided to reduce audio noise in a switching power supply by setting a ringing suppression time of the modulated gate signal to a first time period when the zero crossing voltage is below a predetermined voltage threshold and to a second time when the zero crossing voltage is above the predetermined threshold voltage.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: March 21, 2017
    Assignee: Infineon Technologies AG
    Inventors: Kok Kee Lim, Yong Siang Teo, Siew Teng Winson Wong
  • Publication number: 20170047846
    Abstract: Techniques are described to adjust an amount of time a switch is turned off to control power delivered to a load. In some examples, the amount of time the switch is off includes a delay count value and a set count value based on an output power level. In some examples, the amount of time the switch is off includes a zero crossing delay value based on the input voltage level. Both of these example techniques increase the switching efficiency of the system.
    Type: Application
    Filed: August 11, 2015
    Publication date: February 16, 2017
    Inventors: Yong Siang Teo, Xiaowu Gong, Siu Kam Kok
  • Patent number: 9564771
    Abstract: Methods, devices, and circuits are disclosed delivering a first level of output voltage to a rechargeable battery from a battery charger, the rechargeable battery is coupled to the battery charger by a charging cable. The methods, device, and circuits may further be disclosed applying, in response to an indication of an altered output voltage, a compensation current to one or more elements of the battery charger including a zero crossing (ZC) pin and a selected resistor, the selected resistor is defined by the charging cable coupling the battery charger to the rechargeable battery, and applying the compensation current to the ZC pin and the selected resistor causes an adjustment of the output voltage from the first level of output voltage to a second level of output voltage corresponding to the voltage drop from the impedance of the selected charging cable.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: February 7, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Yong Siang Teo, Kok Kee Lim
  • Patent number: 9564810
    Abstract: A switching power converter includes an inductor coupled to a terminal operably supplied with an input voltage. A semiconductor switch is coupled to the inductor and configured to enable and disable an input current passing through the inductor in accordance with a drive signal. A current sense circuit is coupled to the inductor or the semiconductor switch and is configured to generate a current sense signal representing the input current passing through the inductor or the semiconductor switch. A control circuit receives the current sense signal and is configured to: close the semiconductor switch regularly in accordance with a clock frequency, to integrate the current sense signal thus providing an integrated current sense signal to compare the integrated current sense signal with a threshold that is a function of the input voltage.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: February 7, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Yong Siang Teo, Xiao Wu Gong