Patents by Inventor Ren-Yi Chen

Ren-Yi Chen 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).

  • Publication number: 20120300499
    Abstract: A method for controlling voltage crossing a power switch of a switched-mode power converter is disclosed. The method comprises the steps of: controlling a switch frequency of a power switch of a switched-mode power converter to a first frequency as activating the switched-mode power converter; and changing the switch frequency of the power switch to a second frequency after a specific amount of time; wherein the first frequency is lower than the second frequency.
    Type: Application
    Filed: May 13, 2012
    Publication date: November 29, 2012
    Inventors: Yuan-Wen Chang, Ren-Yi Chen, Yi-Lun Shen
  • Patent number: 8284572
    Abstract: Current control method and apparatus are disclosed. A current limiter is coupled to a switch connected in series with an energy transfer element of a power supply. The current limiter detects a current flowing through the switch and, when the current exceeds a current limit signal, turns off the switch. A limit signal generator provides the current limit signal, detects the maximum current value of the current, and updates the current limit signal according to the maximum current value and an ideal current limit value.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: October 9, 2012
    Assignee: Leadtrend Technology Corp.
    Inventors: Wen-Chung Yeh, Ren-Yi Chen
  • Patent number: 8247981
    Abstract: An integrated circuit and a related method for determining an operation mode are disclosed. The exemplified integrated circuit includes a controller, a multi-function pin, and a mode determination circuit. The controller controls a power switch and is being set to operate in one of the operation modes including a first operation mode and a second operation mode. The multi-function pin is connected to an external resistor. The mode determination circuit detects a signal from the multi-function pin. The signal represents the resistance of the external resistor. If the resistance is within a first range, the controller is operated in the first operation mode. If the resistance is within a second range, the controller is operated in the second operation mode.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: August 21, 2012
    Assignee: Leadtrend Technology Corp.
    Inventors: Ren-Yi Chen, Yi-Lun Shen, Yi-Shan Chu
  • Publication number: 20120140370
    Abstract: A controller is applied with a protection circuit and a protection method. A controller detects an input signal generated by a current flowing through a detection resistor, thereby turning on or off a switch, for controlling the current. A shielding time generator provides a shielding time. When the switch is turned on and when a current timing without the shielding time, a short-circuit detector compares the input signal with a first reference voltage, thereby asserting a short-circuit detection signal. When the switch is turned off or when the current timing is during the shielding time, the short-circuit detection signal is not asserted. Each time the short-circuit detection signal is asserted, a logic controller turns off the switch, thereby reducing the current.
    Type: Application
    Filed: December 6, 2011
    Publication date: June 7, 2012
    Inventors: Ren-Yi Chen, Kuo-Chien Huang
  • Publication number: 20120120533
    Abstract: Power supplies together with related over voltage protection methods and apparatuses. A power supply has a transformer including a primary winding and an auxiliary winding. A power switch is coupled to the primary winding and a sensing resistor coupled between the power switch and a grounding line. A multi-function terminal of a controller is coupled to the sensing resistor. A diode and a first resistor is coupled between the auxiliary winding and the multi-function terminal.
    Type: Application
    Filed: November 16, 2011
    Publication date: May 17, 2012
    Inventors: Kuo-Chien Huang, Ren-Yi Chen
  • Publication number: 20120112564
    Abstract: A discharging module applied in a switched-mode power supply includes a detecting circuit and a discharging circuit. The detecting circuit is coupled to an input port of the switched-mode power supply. The detecting circuit determines if the input port is supplied power according to an AC input power of the switched-mode power supply. When the detecting circuit determines that the input port is not supplied power, the detecting circuit controls the discharging circuit to provide a discharging path for discharging the input port. In this way, the switched-mode power supply does not require a discharging resistor for discharging the input port. Hence, the power consumed when the switched-mode power supply is unloaded is reduced.
    Type: Application
    Filed: April 22, 2011
    Publication date: May 10, 2012
    Inventors: Chin-Ho Wu, Ren-Yi Chen, Chun-Teh Chen
  • Patent number: 8120931
    Abstract: A control circuit for use in a power converter has a multi-function terminal, a current comparator circuit, and an under-voltage detection circuit. The current comparator circuit compares current flowing through a power switch of the power converter with a reference value through the multi-function terminal when the power switch is on, and turns the power switch off when the current reaches the reference value. The under-voltage detection circuit determines whether an input voltage of the power converter is less than a predetermined value through the multi-function terminal when the power switch is turned off.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: February 21, 2012
    Assignee: Leadtrend Technology Corp.
    Inventors: Yuan-Wen Chang, Chun-Teh Chen, Ren-Yi Chen, Yi-Shan Chu
  • Publication number: 20120008343
    Abstract: A high-voltage device provides a constant current drained from a high voltage source to charge a filter capacitor, where a voltage level of the higher voltage source is higher than 90 volts. When the operation voltage of the filter capacitor exceeds a first predetermined value, the charging of the filter capacitor by the constant current is stopped. A feedback loop is then used to maintain the operating voltage at substantially a second predetermined value lower than the first one.
    Type: Application
    Filed: July 6, 2011
    Publication date: January 12, 2012
    Inventors: Ren-Yi Chen, Wen-Chung Yeh, Tsung-Hsiu Wu, Jian-Heng Guo
  • Publication number: 20110068768
    Abstract: A switching power supply includes a power switch, an adjusting circuit and a limit signal generator. The power switch operates according to a switch control signal. The adjusting circuit adjusts the turn-on time of the switch control signal according to a limit signal and a detecting signal which corresponds to the current passing the power switch. When the detecting signal exceeds or is equal to the limit signal, the limit signal generator samples a reference signal and updates the limit signal according to the sampled reference signal.
    Type: Application
    Filed: December 16, 2009
    Publication date: March 24, 2011
    Inventors: Ren-Yi Chen, Chun-Teh Chen
  • Publication number: 20110032024
    Abstract: An integrated circuit and a related method for determining an operation mode are disclosed. The exemplified integrated circuit includes a controller, a multi-function pin, and a mode determination circuit. The controller controls a power switch and is being set to operate in one of the operation modes including a first operation mode and a second operation mode. The multi-function pin is connected to an external resistor. The mode determination circuit detects a signal from the multi-function pin. The signal represents the resistance of the external resistor. If the resistance is within a first range, the controller is operated in the first operation mode. If the resistance is within a second range, the controller is operated in the second operation mode.
    Type: Application
    Filed: August 5, 2009
    Publication date: February 10, 2011
    Applicant: LEADTREND TECHNOLOGY CORP.
    Inventors: Ren-Yi Chen, Yi-Lun Shen, Yi-Shan Chu
  • Publication number: 20100124080
    Abstract: Current control method and apparatus are disclosed. A current limiter is coupled to a switch connected in series with an energy transfer element of a power supply. The current limiter detects a current flowing through the switch and, when the current exceeds a current limit signal, turns off the switch. A limit signal generator provides the current limit signal, detects the maximum current value of the current, and updates the current limit signal according to the maximum current value and an ideal current limit value.
    Type: Application
    Filed: November 20, 2008
    Publication date: May 20, 2010
    Inventors: Wen-Chung Yeh, Ren-Yi Chen
  • Publication number: 20100124084
    Abstract: A control circuit for use in a power converter has a multi-function terminal, a current comparator circuit, and an under-voltage detection circuit. The current comparator circuit compares current flowing through a power switch of the power converter with a reference value through the multi-function terminal when the power switch is on, and turns the power switch off when the current reaches the reference value. The under-voltage detection circuit determines whether an input voltage of the power converter is less than a predetermined value through the multi-function terminal when the power switch is turned off.
    Type: Application
    Filed: November 18, 2008
    Publication date: May 20, 2010
    Inventors: Yuan-Wen Chang, Chun-Teh Chen, Ren-Yi Chen, Yi-Shan Chu
  • Publication number: 20100052742
    Abstract: A PWM control circuit is disclosed. An oscillator generates a triangular signal, received by a limit signal generator to produce a limit signal accordingly. Corresponding to a rising period of the triangular signal, the limit signal sequentially experiences a first holding period, a rising period and a second holding period, wherein the limit signal has a first predetermined value during the first holding period and a second predetermined value during the second holding period. A compare/control circuit compares the limit signal with a detection signal corresponding to a current through a power switch, and controls the power switch accordingly.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 4, 2010
    Inventors: Chun-Teh Chen, Ren-Yi Chen, Da-Chun Wei