Patents by Inventor Liqiang Zhu
Liqiang Zhu 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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Publication number: 20240147591Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a current regulator including a first regulator terminal and a second regulator terminal, the first regulator terminal being configured to receive a diode current flowing through the one or more light emitting diodes, the current regulator being configured to generate a sensing signal representing the diode current, the second regulator terminal being configured to output the sensing signal; a bleeder controller including a first controller terminal and a second controller terminal, the first controller terminal being configured to receive the sensing signal from the second regulator terminal, the bleeder controller being configured to generate a first bleeder control signal based at least in part on the sensing signal, the second controller terminal being configured to output the first bleeder control signal.Type: ApplicationFiled: September 5, 2023Publication date: May 2, 2024Inventors: LIQIANG ZHU, Jun Zhou
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Publication number: 20240097665Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.Type: ApplicationFiled: August 28, 2023Publication date: March 21, 2024Inventors: LIQIANG ZHU, Jun Zhou
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Patent number: 11937350Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.Type: GrantFiled: January 31, 2023Date of Patent: March 19, 2024Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11936351Abstract: System and method for error amplification and processing. For example, the system includes: a signal processing unit configured to receive a reference signal and a feedback signal and generate a digital pulse signal, a frequency of the digital pulse signal being associated with a difference between the reference signal and the feedback signal; a counter configured to receive the digital pulse signal and generate a counter output signal based on at least information associated with the digital pulse signal; and a digital-to-analog converter configured to receive the counter output signal and generate an output signal based on at least information associated with the counter output signal.Type: GrantFiled: January 13, 2021Date of Patent: March 19, 2024Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Yaozhang Chen, Xiangkun Zhai, Liqiang Zhu, Lieyi Fang
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Publication number: 20240049371Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a voltage detector configured to receive a rectified voltage associated with a TRIAC dimmer and generated by a rectifying bridge and generate a first sensing signal representing the rectified voltage; a distortion detector configured to receive the first sensing signal, determine whether the rectified voltage is distorted or not based at least in part on the first sensing signal, and generate a distortion detection signal indicating whether the rectified voltage is distorted or not; and a phase detector configured to receive the first sensing signal and generate a phase detection signal indicating a detected phase range within which the TRIAC dimmer is in a conduction state based at least in part on the first sensing signal.Type: ApplicationFiled: July 11, 2023Publication date: February 8, 2024Inventors: KE LI, ZHUOYAN LI, LIQIANG ZHU
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Publication number: 20240008151Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a phase detector configured to process information associated with a rectified voltage generated by a rectifier and related to a TRIAC dimmer, the rectified voltage corresponding to a first waveform during a first half cycle of an AC voltage and corresponding to a second waveform during a second half cycle of the AC voltage, the phase detector being further configured to generate a phase detection signal representing a first time duration during which the first waveform indicates that the rectified voltage is larger than a predetermined threshold and representing a second time duration during which the second waveform indicates that the rectified voltage is larger than the predetermined threshold; and a mode detector configured to process information associated with the rectified voltage.Type: ApplicationFiled: May 5, 2023Publication date: January 4, 2024Inventors: KE LI, LIQIANG ZHU
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Patent number: 11856670Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a power supply controller configured to receive a cathode voltage from a cathode of a diode, the diode including an anode configured to receive a rectified voltage generated by a rectifying bridge, the power supply controller being further configured to generate a first signal based at least in part on the cathode voltage; and a driver configured to receive the first signal and generate a second signal based at least in part on the first signal, the driver being further configured to output the second signal to a gate terminal of a transistor, the transistor including a source terminal coupled to the driver and a first resistor, the transistor further including a drain terminal coupled to the one or more light emitting diodes and an output capacitor connected to the cathode of the diode.Type: GrantFiled: December 14, 2022Date of Patent: December 26, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Zhuoyan Li, Ke Li, Liqiang Zhu
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Patent number: 11792901Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a current regulator including a first regulator terminal and a second regulator terminal, the first regulator terminal being configured to receive a diode current flowing through the one or more light emitting diodes, the current regulator being configured to generate a sensing signal representing the diode current, the second regulator terminal being configured to output the sensing signal; a bleeder controller including a first controller terminal and a second controller terminal, the first controller terminal being configured to receive the sensing signal from the second regulator terminal, the bleeder controller being configured to generate a first bleeder control signal based at least in part on the sensing signal, the second controller terminal being configured to output the first bleeder control signal.Type: GrantFiled: January 19, 2022Date of Patent: October 17, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11784638Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.Type: GrantFiled: October 15, 2021Date of Patent: October 10, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11743984Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a voltage detector configured to receive a rectified voltage associated with a TRIAC dimmer and generated by a rectifying bridge and generate a first sensing signal representing the rectified voltage; a distortion detector configured to receive the first sensing signal, determine whether the rectified voltage is distorted or not based at least in part on the first sensing signal, and generate a distortion detection signal indicating whether the rectified voltage is distorted or not; and a phase detector configured to receive the first sensing signal and generate a phase detection signal indicating a detected phase range within which the TRIAC dimmer is in a conduction state based at least in part on the first sensing signal.Type: GrantFiled: December 8, 2021Date of Patent: August 29, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Ke Li, Zhuoyan Li, Liqiang Zhu
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Patent number: 11723128Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a phase detector configured to process information associated with a rectified voltage generated by a rectifier and related to a TRIAC dimmer, the rectified voltage corresponding to a first waveform during a first half cycle of an AC voltage and corresponding to a second waveform during a second half cycle of the AC voltage, the phase detector being further configured to generate a phase detection signal representing a first time duration during which the first waveform indicates that the rectified voltage is larger than a predetermined threshold and representing a second time duration during which the second waveform indicates that the rectified voltage is larger than the predetermined threshold; and a mode detector configured to process information associated with the rectified voltage.Type: GrantFiled: December 17, 2021Date of Patent: August 8, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Ke Li, Liqiang Zhu
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Publication number: 20230225028Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a power supply controller configured to receive a cathode voltage from a cathode of a diode, the diode including an anode configured to receive a rectified voltage generated by a rectifying bridge, the power supply controller being further configured to generate a first signal based at least in part on the cathode voltage; and a driver configured to receive the first signal and generate a second signal based at least in part on the first signal, the driver being further configured to output the second signal to a gate terminal of a transistor, the transistor including a source terminal coupled to the driver and a first resistor, the transistor further including a drain terminal coupled to the one or more light emitting diodes and an output capacitor connected to the cathode of the diode.Type: ApplicationFiled: December 14, 2022Publication date: July 13, 2023Inventors: ZHUOYAN LI, KE LI, LIQIANG ZHU
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Patent number: 11695401Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.Type: GrantFiled: November 5, 2021Date of Patent: July 4, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11678417Abstract: System and method for voltage conversion to drive one or more light emitting diodes with at least a TRIAC dimmer. For example, the system includes: a phase detector configured to receive a first rectified voltage generated based at least in part on an AC input voltage processed by at least the TRIAC dimmer, the phase detector being further configured to generate a digital signal representing phase information associated with the first rectified voltage; a voltage generator configured to receive the digital signal and generate a DC voltage based at least in part on the digital signal; and a driver configured to receive the DC voltage and affect, based at least in part on the DC voltage, a current flowing through the one or more light emitting diodes; wherein the current changes with the phase information according to a predetermined function.Type: GrantFiled: November 16, 2021Date of Patent: June 13, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Jiqing Yang, Zhuoyan Li, Liqiang Zhu, Jun Zhou
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Publication number: 20230179084Abstract: Controller and method for power converter. For example, a controller for a power converter includes: a first driver configured to generate a drive current and output the drive current to a first terminal of a first transistor, the first transistor further including a second terminal and a third terminal; a second driver configured to generate a drive voltage and output the drive voltage to a fourth terminal of a second transistor, the second transistor further including a fifth terminal and a sixth terminal; a demagnetization detector configured to receive a first voltage of the first terminal of the first transistor and generate a detection signal based at least in part on the first voltage; and a control signal generator configured to receive the detection signal and generate a first control signal and a second control signal based at least in part on the detection signal.Type: ApplicationFiled: December 2, 2022Publication date: June 8, 2023Inventor: LIQIANG ZHU
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Publication number: 20230180364Abstract: System and method for controlling a bleeder current to increase a power factor of an LED lighting system without any TRIAC dimmer. For example, the system for controlling a bleeder current to increase a power factor of an LED lighting system without any TRIAC dimmer includes: a first current controller configured to receive a rectified voltage generated by a rectifier that directly receives an AC input voltage without through any TRIAC dimmer; and a second current controller configured to: control a light emitting diode current flowing through one or more light emitting diodes that receive the rectified voltage not clipped by any TRIAC dimmer; and generate a sensing voltage based at least in part upon the light emitting diode current, the sensing voltage representing the light emitting diode current in magnitude.Type: ApplicationFiled: November 9, 2022Publication date: June 8, 2023Inventors: LIQIANG ZHU, QIAN FANG, ZHILIN FAN, KE LI
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Publication number: 20230180360Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.Type: ApplicationFiled: January 31, 2023Publication date: June 8, 2023Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11638335Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.Type: GrantFiled: September 17, 2020Date of Patent: April 25, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11570859Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.Type: GrantFiled: September 17, 2020Date of Patent: January 31, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Jun Zhou
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Patent number: 11564297Abstract: System and method for current control. As an example, the system for current control includes: a transistor including a drain terminal, a gate terminal, and a source terminal, the drain terminal being coupled to one or more light emitting diodes; a resistor coupled to the source terminal of the transistor and configured to generate a resistor voltage related to a current flowing through the one or more emitting diodes; a voltage detector configured to receiver a first input voltage related to a second input voltage received by the one or more light emitting diodes; and a voltage controller coupled to the voltage detector, the resistor, and the gate terminal of the transistor; wherein the voltage detector is further configured to: detect the first input voltage; and generate a control signal based at least in part on the first input voltage.Type: GrantFiled: March 3, 2021Date of Patent: January 24, 2023Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Liqiang Zhu, Zhuoyan Li, Jiqing Yang