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公开(公告)号：US20190082507A1
公开(公告)日：2019-03-14
申请号：US16129576
申请日：2018-09-12
发明人： LIQIANG ZHU , JUN ZHOU , LIEYI FANG
IPC分类号： H05B33/08
摘要： System and method for controlling one or more light emitting diodes. For example, the system includes a bleeder configured to receive a rectified voltage generated by a rectifying bridge, and a dimmer detector configured to receive an input voltage generated by a voltage divider, determine whether or not the rectified voltage is associated with a TRIAC dimmer, and output a control signal to the bleeder. The voltage divider is configured to receive the rectified voltage, and the input voltage indicates a magnitude of the rectified voltage.
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公开(公告)号：US20170359880A1
公开(公告)日：2017-12-14
申请号：US15649586
申请日：2017-07-13
发明人： LIQIANG ZHU , Jiqing Yang , Zhuoyan Li , Lieyi Fang
CPC分类号： H05B33/0845 , H05B33/0815 , H05B33/0887 , H05B37/0281 , H05B39/044 , Y02B20/146
摘要： Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
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13.发明公开公开(公告)号：US20230225028A1
公开(公告)日：2023-07-13
申请号：US18081528
申请日：2022-12-14
发明人： ZHUOYAN LI , KE LI , LIQIANG ZHU
摘要： 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.
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14.发明公开公开(公告)号：US20230179084A1
公开(公告)日：2023-06-08
申请号：US18074215
申请日：2022-12-02
发明人： LIQIANG ZHU
CPC分类号： H02M1/088 , G01R33/1215 , H02M1/0012
摘要： 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.
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15.发明申请公开(公告)号：US20220210880A1
公开(公告)日：2022-06-30
申请号：US17545752
申请日：2021-12-08
发明人： KE LI , ZHOUYAN LI , LIQIANG ZHU
IPC分类号： H05B45/14 , H05B47/165 , H05B45/39 , H05B45/345
摘要： 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.
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公开(公告)号：US20200100340A1
公开(公告)日：2020-03-26
申请号：US16566701
申请日：2019-09-10
发明人： LIQIANG ZHU , Jun Zhou , Yongsheng Su , Lieyi Fang
摘要： System and method for dimming control of one or more light emitting diodes. An example system includes one or more signal processing components configured to receive a first signal associated with a TRIAC dimmer, process information associated with the first signal, determine whether the TRIAC dimmer is in a first condition or a second condition, generate a second signal based on at least information associated with the first signal, and send the second signal to a switch. The one or more signal processing components are further configured to, if the TRIAC dimmer is determined to be in the first condition, generate the second signal to cause the switch to be opened and closed corresponding to a modulation frequency.
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公开(公告)号：US20190327812A1
公开(公告)日：2019-10-24
申请号：US16284513
申请日：2019-02-25
发明人： XIANGKUN ZHAI , LIQIANG ZHU , QIANG LUO
IPC分类号： H05B33/08
摘要： Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
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公开(公告)号：US20190230757A1
公开(公告)日：2019-07-25
申请号：US16222859
申请日：2018-12-17
发明人： MENG LI , MINGLI KANG , LIQIANG ZHU , LIEYI FANG
摘要： Systems and methods are provided herein for current regulation. An example system controller includes: a first controller terminal configured to receive an input voltage, the first controller terminal being further configured to allow a first current flowing into the system controller based at least in part on the input voltage in response to one or more switches being closed; a second controller terminal configured to allow the first current to flow out of the system controller through the second controller terminal in response to the one or more switches being closed; a fourth controller terminal coupled to the third controller terminal through a first capacitor, the first capacitor not being any part of the system controller; and an error amplifier configured to generate a compensation signal based at least in part on the current sensing signal, the error amplifier including a second capacitor.
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公开(公告)号：US20180103520A1
公开(公告)日：2018-04-12
申请号：US15836461
申请日：2017-12-08
发明人： LIQIANG ZHU , JIQING YANG , ZHUOYAN LI , LIEYI FANG
CPC分类号： H05B33/0845 , H05B33/0815 , H05B33/0887 , H05B37/0281 , H05B39/044 , Y02B20/146
摘要： Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
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公开(公告)号：US20170339758A1
公开(公告)日：2017-11-23
申请号：US15406293
申请日：2017-01-13
发明人： QIANG LUO , LIQIANG ZHU , ZHILIANG CHEN , LIEYI FANG
CPC分类号： H05B33/0812 , H05B33/0818
摘要： A two-terminal IC chip and method thereof. For example, a two-terminal IC chip includes a first chip terminal, a second chip terminal, a first switch configured to receive a control signal, a first capacitor coupled to the first switch, a second switch configured to receive the control signal, a second capacitor coupled to the second switch, a third switch configured to receive the control signal, and a third capacitor coupled to the third switch. A first terminal voltage is a voltage of the first chip terminal, a second terminal voltage is a voltage of the second chip terminal, and a chip voltage is equal to a difference between the first terminal voltage and the second terminal voltage.
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