Patents by Inventor Naixing Kuang
Naixing Kuang 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: 8901851Abstract: The present invention provides a controller used in a TRIAC dimmer compatible LED driver and method thereof. The controller comprises a dimming signal generator, a dimming signal processor and a switch control circuit. The dimming signal generator receives an AC chopped voltage from a TRIAC dimmer and generates a dimming signal with regulated duty cycle in accordance with the AC chopped voltage. The dimming signal processor is coupled to the dimming signal generator and generates a processed dimming signal in accordance with the dimming signal. The duty cycle of the processed dimming signal is a sum of a predetermined duty cycle and the duty cycle of the dimming signal. Based on the processed dimming signal and a feedback signal indicative of the current flowing through LED, the switch control circuit generates a control signal to control at least one switch in a switching converter.Type: GrantFiled: February 17, 2012Date of Patent: December 2, 2014Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Naixing Kuang, Jiali Cai, Hongxia Yu
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Patent number: 8885362Abstract: A fast startup switching converter having a first switch, a second switch, a third switch, a first capacitor, and a controller controlling the ON and OFF switching of the second and third switches. The first terminal of the first switch is coupled to the input terminal of the switching converter, the second terminal is coupled to the first terminal of the second switch. The first terminal of the third switch is coupled to the second terminal of the first switch and the first terminal of the second switch. The first capacitor is coupled to the second terminal of the third switch and the controller to provide a power supply voltage for the controller. The switching converter charges the first capacitor through the first and third switches in a first working state, and transfers energy to a load through the first and second switches in a second working state.Type: GrantFiled: September 12, 2012Date of Patent: November 11, 2014Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Naixing Kuang, Jiali Cai, Hongxia Yu
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Publication number: 20140176017Abstract: A power supply system having a voltage source; a load; a filter circuit to filter the voltage provided by the voltage source and to output a filtered voltage; and a follower circuit configured to generate an output signal at an output of the follower circuit based on the filtered voltage, and further wherein the output of the follower circuit is coupled to the load.Type: ApplicationFiled: December 24, 2013Publication date: June 26, 2014Applicant: Chengdu Monolithic Power Systems Co. Ltd.Inventors: Naixing Kuang, Hongxia Yu, Zhijun Ye
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Publication number: 20140159693Abstract: A step-down switching mode power supply having: a Buck converter configured to provide power to a load, wherein the Buck converter has a power switch and an energy storage component; a current sense circuit coupled to the power switch to generate a current sense signal; a square circuit configured to generate a first multiply signal indicating the squared value of the input voltage; a multiply circuit configured to generate a product signal based on the first multiply signal and a second multiply signal; a current comparison circuit configured to generate a current comparison signal based on the current sense signal and the product signal; and a logic circuit configured to control the power switch.Type: ApplicationFiled: December 10, 2013Publication date: June 12, 2014Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.Inventors: Naixing Kuang, Bo Yu, Jiaqi Yu, Qiaoan Zuo
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Publication number: 20140152283Abstract: A voltage detecting circuit used with a switching converter. The switching converter having an energy storage component, a first power switch and a second switch. The voltage detecting circuit has a sample and hold circuit configured to sample and hold the voltage at the connection node of the energy storage component and the first power switch when the first power switch is OFF and the second power switch is ON; and an average circuit configured to average the sampled voltage during a switching period to generate a detecting signal in proportional to the output voltage of the switching converter.Type: ApplicationFiled: December 4, 2013Publication date: June 5, 2014Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventor: Naixing Kuang
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Publication number: 20140085945Abstract: A power supply system has a current source configured to provide an output current, a load supplied by the current source, and a current ripple suppression circuit. The current ripple suppression circuit has a first end and a second end, wherein the first end of the current ripple suppression circuit is coupled to the load, and the second end of the current ripple suppression circuit is coupled to a reference ground; wherein the current ripple suppression circuit is configured to suppress the current ripple in the output current and adaptively adjust the output current of the current source at a predetermined current level.Type: ApplicationFiled: September 26, 2013Publication date: March 27, 2014Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Naixing Kuang, Jiaqi Yu, Bo Yu
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Patent number: 8604710Abstract: The present disclosure discloses a multi-mode dimming circuit configurable to operate in a first dimming mode, a second dimming mode and a third dimming mode. The present disclosure also discloses separate dimming circuits for respectively realize the three dimming modes. In one embodiment the multi-mode dimming circuit may comprise a first input terminal, a second input terminal, a third input terminal, an output terminal, a resistive device, an oscillation circuit and a pulse width modulation (PWM) circuit. Users may flexibly configure the multi-mode dimming circuit to operate in one of the three different dimming modes by varying the external devices and/or signals coupled to each of the first, second and third input terminals.Type: GrantFiled: September 2, 2011Date of Patent: December 10, 2013Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Bo Yu, Yuancheng Ren, Lei Du, Naixing Kuang, Zhijiang Yang
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Patent number: 8581518Abstract: Triac dimmer compatible switching mode power supplies used as LED drivers are disclosed herein. A PFC controller is configured in the switching mode power supplies. With the PFC controller, the current keeping the triac in the on-state is supplied by the DC/DC converter, and the LC resonance is reduced.Type: GrantFiled: May 18, 2011Date of Patent: November 12, 2013Assignee: Monolithic Power Systems, Inc.Inventors: Naixing Kuang, Lei Du, Junming Zhang, Yuancheng Ren
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Publication number: 20130293154Abstract: A controller used in a light emitting element driving circuit, wherein the light emitting element driving circuit has a power converter configured to provide an output current for the light emitting element. The controller has a dimming processing unit and a current control unit. The dimming processing unit is configured to receive a first dimming signal with a first duty cycle and a second dimming signal with a second duty cycle, and to generate a second dimming processing signal relative to the product of the first duty cycle and the second duty cycle. The current control unit is coupled between the dimming processing unit and the power converter, and is configured to generate a control signal for the power converter based on the second dimming processing signal and a feedback signal indicating the output current.Type: ApplicationFiled: May 2, 2013Publication date: November 7, 2013Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.Inventors: Naixing Kuang, Zhijun Ye, Kun Yi, Bo Yu
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Patent number: 8576588Abstract: The present technology are directed to switching mode power supplies with primary side control. In one embodiment, the switching mode power supply provides an equivalent current signal which represents a load current. The equivalent current signal is then used to control a switching circuit in the switching mode power supply.Type: GrantFiled: January 28, 2011Date of Patent: November 5, 2013Assignee: Monolithic Power Systems, Inc.Inventors: Naixing Kuang, Lei Du, Junming Zhang, Yuancheng Ren
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Patent number: 8525423Abstract: Circuitry and methods for driving a plurality of LED strings are disclosed herein. In one embodiment, the circuitry comprises a plurality of current regulating circuits electrically coupled to the LED strings and are configured to regulate a current flowing through the LED strings. At least two control circuits are coupled to the current regulating circuits and are configured to generate a control signal according to terminal voltages of the corresponding current regulating circuits. A voltage converter is electrically coupled to the LED strings and to the at least two control circuits, and is configured to regulate the DC driving voltage according to the at least two control signals.Type: GrantFiled: March 22, 2011Date of Patent: September 3, 2013Assignee: Monolithic Power Systems, Inc.Inventors: Bo Yu, Yuancheng Ren, Lei Du, Naixing Kuang, Zhishun Li
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Publication number: 20130154487Abstract: The present invention provides a controller used in a TRIAC dimmer compatible LED driver and method thereof. The controller comprises a dimming signal generator, a dimming signal processor and a switch control circuit. The dimming signal generator receives an AC chopped voltage from a TRIAC dimmer and generates a dimming signal with regulated duty cycle in accordance with the AC chopped voltage. The dimming signal processor is coupled to the dimming signal generator and generates a processed dimming signal in accordance with the dimming signal. The duty cycle of the processed dimming signal is a sum of a predetermined duty cycle and the duty cycle of the dimming signal. Based on the processed dimming signal and a feedback signal indicative of the current flowing through LED, the switch control circuit generates a control signal to control at least one switch in a switching converter.Type: ApplicationFiled: February 17, 2012Publication date: June 20, 2013Inventors: Naixing Kuang, Jiali Cai, Hongxia Yu
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Publication number: 20130134894Abstract: A switch-mode power supply and associated control circuit for a light-emitting device are disclosed. The switch-mode power supply having a first switch which is turned ON or OFF by a control signal. The control circuit having an error amplifier, a minimum-off time control circuit and a logic circuit, wherein the error amplifier is configured to provide a compensation signal based on a dimming signal and a feedback signal. The minimum-off time control circuit is configured to provide a minimum-off time control signal to adjust a minimum-off time period of the first switch based on the compensation signal. The logic circuit is configured to provide the control signal based on the minimum-off time control signal.Type: ApplicationFiled: November 21, 2012Publication date: May 30, 2013Inventor: Naixing KUANG
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Publication number: 20130082742Abstract: A no-load detecting circuit and the method thereof are disclosed. The no-load detecting circuit may be applied in switching mode power supplies or other circuits. The no-load detecting circuit comprises: a variable resistance circuit coupled in series to a load of the switching mode power supply; and a first comparison circuit coupled to the variable resistance circuit to receive the voltage across the variable resistance circuit, wherein based on the comparison of the voltage across the variable resistance circuit and a first threshold, the first comparison circuit generates a no-load detecting signal indicative of the load status; wherein the equivalent resistance of the variable resistance circuit varies based on the varying of the load of the switching mode power supply.Type: ApplicationFiled: June 29, 2012Publication date: April 4, 2013Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Yuancheng Ren, En Li, Naixing Kuang, Yike Li
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Publication number: 20130077353Abstract: A fast startup switching converter comprises a first switch, a second switch, a third switch, a first capacitor, and a controller controlling the ON and OFF switching of the second and third switches. The first terminal of the first switch is coupled to the input terminal of the switching converter, the second terminal is coupled to the first terminal of the second switch. The first terminal of the third switch is coupled to the second terminal of the first switch and the first terminal of the second switch. The first capacitor is coupled to the second terminal of the third switch and the controller to provide a power supply voltage for the controller. The switching converter charges the first capacitor through the first and third switches in a first working state, and transfers energy to a load through the first and second switches in a second working state.Type: ApplicationFiled: September 12, 2012Publication date: March 28, 2013Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Naixing Kuang, Jiali Cai, Hongxia Yu
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Patent number: 8368320Abstract: Methods and circuits for CCFL driving circuit control are disclosed according to various embodiments of the present disclosure. In certain embodiments, the methods and circuits for CCFL driving circuit control provide a control signal for regulating both the duty ratio and frequency of the switching control signal that controls the CCFL driving circuit. External components for control loop compensation and frequency sweeping rate, and/or striking frequency setting may also be utilized.Type: GrantFiled: September 15, 2010Date of Patent: February 5, 2013Assignee: Monolithic Power Systems, Inc.Inventors: Naixing Kuang, Lei Du, Yuancheng Ren
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Publication number: 20130020945Abstract: A LED driver comprising: a power switch; a transformer comprising a primary winding coupled to the power switch, a secondary winding and a third winding; a current sense circuit configured to sense a current flowing through the power switch and generates a current sense signal; a zero cross detecting circuit configured to detect a current flowing through the secondary winding, and generates a zero cross detecting signal; a compensation circuit configured to compensate the current sense signal based on the current flowing through the third winding; a control circuit configured to receive the compensated current sense signal and the zero cross detecting signal, and wherein the control circuit generates a control signal to control the power switch.Type: ApplicationFiled: July 17, 2012Publication date: January 24, 2013Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Naixing Kuang, Haigang Cao, Zhijun Ye
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Patent number: 8269423Abstract: Various embodiments of LED drivers and associated methods of are described below. In one embodiment, a method for controlling an LED driver includes receiving a reference voltage, receiving a feedback voltage from said LED driver, receiving said input voltage as a first feed forward voltage and said output voltage as a second feed forward voltage, generating a hysteretic width based on said first feed forward voltage and said second feed forward voltage, and generating a hysteretic band voltage using said hysteretic width and said reference voltage. The method also includes generating a first control signal for controlling said LED driver based on said hysteretic band voltage and said feedback voltage, inverting said first control signal to generate a second control signal for controlling said LED driver, and achieving a generally fixed frequency for said LED driver.Type: GrantFiled: September 10, 2010Date of Patent: September 18, 2012Assignee: Monolithic Power Systems, Inc.Inventors: Kaiwei Yao, Naixing Kuang, Edward Deng
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Publication number: 20120194078Abstract: The embodiments of the present circuit and method disclose a light-emitting diode (LED) driver system. The LED driver system may comprise an isolated converter and a DC/DC converter. The isolated converter may be coupled to a first input signal, and may provide a LED current and a bus voltage. The isolated converter may be configured to regulate the LED current and the bus voltage separately in accordance with a dimming signal. The DC/DC converter may comprise an input coupled to the bus voltage.Type: ApplicationFiled: January 25, 2012Publication date: August 2, 2012Inventors: Frank Ren, Naixing Kuang, Bairen Liu, Licheng Sheng
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Patent number: 8164218Abstract: SIMO power converters and associated methods of control are disclosed herein. In one embodiment, a method of converting a signal input signal into multiple output signals includes supplying power to a plurality of output terminals based on a signal input signal, detecting a voltage at individual output terminals, determining an arithmetic relationship between the detected voltages of the output terminals, and adjusting the power supplied to the plurality of output terminals based at least in part on the determined arithmetic relationship between the detected voltages of the output terminals.Type: GrantFiled: July 17, 2009Date of Patent: April 24, 2012Assignee: Monolithic Power Systems, Inc.Inventors: Naixing Kuang, Lei Du, Junming Zhang, Yuancheng Ren