Patents by Inventor Tzu-Huan Chiu

Tzu-Huan Chiu 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: 7714556
    Abstract: A quick response switching regulator comprises a power stage having a pair of high-side switch and low-side switch and an inductor connected together by a switching node, a feedback circuit for producing a feedback signal, and a control circuit producing control signals with reference to the feedback signal to control the pair of high-side switch and low-side switch. The feedback circuit is connected to the switching node to shorten the feedback path and speed up the response. The control circuit further monitors the current flowing through the inductor to keep the low-side switch off before the peak of the inductor current becomes higher than a value.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: May 11, 2010
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Tzu-Huan Chiu, Nien-Hui Kung, Chien-Ping Lu
  • Publication number: 20100072915
    Abstract: The present invention discloses a boost driver circuit which converts an input voltage to an output voltage and supplies it to a load, the boost driver circuit comprising: a power transistor electrically connected with a node between the input voltage and the output voltage; a pulse width modulation driver circuit for controlling the operation of the power transistor; an output node electrically connected with the output voltage; a feedback node electrically connected with the load; a low voltage transistor electrically connected with the feedback node; and a clamp and fast discharge circuit electrically connected with the feedback node for discharging the feedback node when the voltage at the feedback node is higher than a predetermined voltage.
    Type: Application
    Filed: April 1, 2009
    Publication date: March 25, 2010
    Inventors: Kwan-Jen Chu, Nien-Hui Kung, Tzu-Huan Chiu, Chien-Ping Lu
  • Publication number: 20100052629
    Abstract: A switching regulator includes a low-side switch having a body diode. During the low-side switch is on, a zero-current sense circuit monitors the inductor current of the switching regulator and triggers a signal to turn off the low-side switch when the inductor current falls down to a zero-current threshold, to prevent reverse inductor current from the output terminal of the switching regulator. A body-diode turn-on time controller monitors the turn-on time of the body diode and adjusts the zero-current threshold according thereto, and the turn-on time of the body diode can be reduced to an optimal interval subsequently. The self-adjustable zero-current threshold is adaptive according to the application conditions, such as the inductor size, input voltage and output voltage of the switching regulator.
    Type: Application
    Filed: November 3, 2009
    Publication date: March 4, 2010
    Inventors: Kwan-Jen Chu, Nien-Hui Kung, Tzu-Huan Chiu, Chien-Ping Lu
  • Publication number: 20100019682
    Abstract: A LED driver is disclosed for providing a current for LED lighting. The LED driver includes an inductor and a controller having a power switch, and the inductor, the power switch and a LED to be driven are configured to be an asynchronous boost converter. Because the driven LED serves as a rectifier diode of the asynchronous boost converter, the controller may have fewer components and requires smaller die area.
    Type: Application
    Filed: September 23, 2008
    Publication date: January 28, 2010
    Inventors: Chien-Ping Lu, Wei-Hsin Wei, Kwan-Jen Chu, Tzu-Huan Chiu
  • Patent number: 7652945
    Abstract: A switching regulator includes a low-side switch having a body diode. During the low-side switch is on, a zero-current sense circuit monitors the inductor current of the switching regulator and triggers a signal to turn off the low-side switch when the inductor current falls down to a zero-current threshold, to prevent reverse inductor current from the output terminal of the switching regulator. A body-diode turn-on time controller monitors the turn-on time of the body diode and adjusts the zero-current threshold according thereto, and the turn-on time of the body diode can be reduced to an optimal interval subsequently. The self-adjustable zero-current threshold is adaptive according to the application conditions, such as the inductor size, input voltage and output voltage of the switching regulator.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: January 26, 2010
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Nien-Hui Kung, Tzu-Huan Chiu, Chien-Ping Lu
  • Publication number: 20090261654
    Abstract: The present invention provides a power path control circuit comprising: an input node for receiving an external power; a first power transistor electrically connected between the input node and a first node, for controlling power supplied from the input node to the first node; a second power transistor electrically connected between the first node and a battery, for controlling power supplied from the battery to the first node; an error amplifier including an output electrically connected with a gate of the second power transistor, a first input terminal electrically connected with the first node, and a second input terminal electrically connected with the battery, wherein a voltage difference is allocated between the two input terminals.
    Type: Application
    Filed: March 24, 2009
    Publication date: October 22, 2009
    Inventors: Tzu-Huan Chiu, Kwan-Jen Chu, Nien-Hui Kung
  • Publication number: 20090174388
    Abstract: The present invention discloses a dual power switch and a voltage regulator using the dual power switch. The dual power switch comprises a PMOS power switch and an NMOS power switch connected in parallel and operating according to corresponding predetermined conditions, respectively.
    Type: Application
    Filed: February 17, 2009
    Publication date: July 9, 2009
    Inventors: Nien-Hui Kung, Kwan-Jen Chu, Chun-Tsung Chen, Tzu-Huan Chiu
  • Publication number: 20080246455
    Abstract: A switching regulator includes a low-side switch having a body diode. During the low-side switch is on, a zero-current sense circuit monitors the inductor current of the switching regulator and triggers a signal to turn off the low-side switch when the inductor current falls down to a zero-current threshold, to prevent reverse inductor current from the output terminal of the switching regulator. A body-diode turn-on time controller monitors the turn-on time of the body diode and adjusts the zero-current threshold according thereto, and the turn-on time of the body diode can be reduced to an optimal interval subsequently. The self-adjustable zero-current threshold is adaptive according to the application conditions, such as the inductor size, input voltage and output voltage of the switching regulator.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 9, 2008
    Inventors: Kwan-Jen Chu, Nien-Hui Kung, Tzu-Huan Chiu, Chien-Ping Lu
  • Publication number: 20080211470
    Abstract: The present invention discloses an auto discharge linear regulator comprising: a basic linear regulator for converting an input voltage to an output voltage at an output node; a load detector circuit for detecting the load condition at the output node; and an discharge control circuit under control by the load detector circuit for discharging the voltage at the output node.
    Type: Application
    Filed: February 13, 2008
    Publication date: September 4, 2008
    Inventors: Tzu-Huan Chiu, Kwan-Jen Chu, Chien-Ping Lu
  • Publication number: 20080174286
    Abstract: A quick response switching regulator comprises a power stage having a pair of high-side switch and low-side switch and an inductor connected together by a switching node, a feedback circuit for producing a feedback signal, and a control circuit producing control signals with reference to the feedback signal to control the pair of high-side switch and low-side switch. The feedback circuit is connected to the switching node to shorten the feedback path and speed up the response. The control circuit further monitors the current flowing through the inductor to keep the low-side switch off before the peak of the inductor current becomes higher than a value.
    Type: Application
    Filed: August 29, 2007
    Publication date: July 24, 2008
    Inventors: Kwan-Jen Chu, Tzu-Huan Chiu, Nien-Hui Kung, Chien-Ping Lu
  • Publication number: 20070135070
    Abstract: An extended range received signal strength indicator module includes input lines connected to a variable gain amplifier, which passes the amplified RF signal to a polyphase, which in turn passes the filtered signal to a series of RSSI stages. Each RSSI stage includes a log amplifier and outputs an amplified current to a current summer as well as to the next RSSI stage in the series. The current summer outputs the sum of the received currents to RSSI_OUT. An additional frequency filter and RSSI stage with inputs connected to the input lines before the variable gain amplifier that outputs the modified current to the current summer is also included. A control circuit switches the additional RSSI stage on or off as determined by a detection circuit that monitors the value of RSSI_OUT.
    Type: Application
    Filed: December 13, 2005
    Publication date: June 14, 2007
    Inventors: Tzu-Huan Chiu, Yi-Jen Lin, Yu-Hua Liu