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公开(公告)号：US10811965B2
公开(公告)日：2020-10-20
申请号：US16293695
申请日：2019-03-06
发明人： Qian Fang , Cong Lan , Lieyi Fang
摘要： Systems and methods are provided for regulating a power converter. An example system controller includes: a driver configured to output a drive signal to a switch to affect a current flowing through an inductive winding of a power converter, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed in response to the drive signal during the on-time period. The switch is opened in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. One minus the duty cycle is equal to a parameter. The system controller is configured to keep a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant.
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公开(公告)号：US10756687B2
公开(公告)日：2020-08-25
申请号：US16206677
申请日：2018-11-30
发明人： Miao Li , Qiang Luo , Lieyi Fang
摘要： System controller and method for providing at least an output voltage. For example, the system controller includes a first controller terminal configured to receive an input voltage. The input voltage is associated with an input-voltage magnitude. Additionally, the system controller includes a second controller terminal configured to receive a control voltage, and a third controller terminal configured to output an output voltage to a load. Moreover, the system controller includes a supply voltage generator configured to receive the input voltage from the first controller terminal and generate a supply voltage. The supply voltage is associated with a supply voltage magnitude. Also, the system controller includes a ramp voltage generator configured to receive the supply voltage and generate a ramp voltage.
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公开(公告)号：US10742122B2
公开(公告)日：2020-08-11
申请号：US16281404
申请日：2019-02-21
发明人： Yuan Lin , Xiaomin Huang , Qiang Luo , Lieyi Fang
摘要： System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes an operation-mode-selection component and a driving component. The operation-mode-selection component is configured to receive a first signal related to an output load of the power conversion system and a second signal related to an input signal received by the power conversion system and output a mode-selection signal based on at least information associated with the first signal and the second signal. The driving component is configured to receive the mode-selection signal and generate a drive signal based on at least information associated with the mode-selection signal, the driving signal corresponding to a switching frequency.
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公开(公告)号：US10694599B2
公开(公告)日：2020-06-23
申请号：US16284513
申请日：2019-02-25
发明人： Xiangkun Zhai , Liqiang Zhu , Qiang Luo
IPC分类号： H05B45/10
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：US10680525B2
公开(公告)日：2020-06-09
申请号：US16288776
申请日：2019-02-28
发明人： Qian Fang , Xiangkun Zhai , Lieyi Fang
摘要： Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
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公开(公告)号：US10624188B2
公开(公告)日：2020-04-14
申请号：US16385327
申请日：2019-04-16
发明人： Zhuoyan Li , Liqiang Zhu , Xueyou Ling , Jun Zhou , Lieyi Fang
摘要： System controller and method for a lighting system according to certain embodiments. For example, the system controller includes a first controller terminal configured to receive a first signal, and a second controller terminal coupled to a first transistor terminal of a transistor. The transistor further includes a second transistor terminal and a third transistor terminal. The second transistor terminal is coupled to a first winding terminal of a winding, and the winding further includes a second winding terminal coupled to a capacitor. Additionally, the system controller includes a third controller terminal coupled to the third transistor terminal of the transistor, and a fourth controller terminal coupled to a resistor and configured to receive a second signal. The second signal represents a magnitude of a current flowing through at least the winding, the third controller terminal, the fourth controller terminal, and the resistor.
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37.发明授权公开(公告)号：US10536081B2
公开(公告)日：2020-01-14
申请号：US15799945
申请日：2017-10-31
发明人： Xiangkun Zhai , Yuan Lin , Xiaomin Huang , Lieyi Fang
IPC分类号： H03K3/00 , H02M3/335 , H03K17/0414 , H03K17/0422 , H03K17/06
摘要： System and method for driving a bipolar junction transistor for a power converter. The system includes a current generator configured to output a drive current signal to a bipolar junction transistor to adjust a primary current flowing through a primary winding of a power converter. The current generator is further configured to output the drive current signal to turn on the bipolar junction transistor during a first time period, a second time period, and a third time period, the second time period separating the first time period from the third time period, drive the bipolar junction transistor to operate in a hard-saturation region during the first time period and the second time period, and drive the bipolar junction transistor to operate in a quasi-saturation region during the third time period.
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公开(公告)号：US10512131B2
公开(公告)日：2019-12-17
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：US10432096B2
公开(公告)日：2019-10-01
申请号：US15804712
申请日：2017-11-06
发明人： Qian Fang , Xiangkun Zhai , Lleyi Fang
摘要： Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
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公开(公告)号：US10396666B1
公开(公告)日：2019-08-27
申请号：US15945200
申请日：2018-04-04
发明人： Haibo Li , Fagang Wang , Qiang Luo , Lieyi Fang
摘要： System controller and method for a power converter. For example, the system controller includes a first current controller configured to receive a first input signal and generate a first output signal based at least in part on the first input signal, a second current controller configured to receive a compensation signal and a second input signal and generate a second output signal based at least in part. on the second input signal, and a drive signal generator configured to receive the first output signal and the second output signal, generate a first drive signal based at least in part on the first output signal and the second output signal, and generate a second drive signal based at least in part on the first output signal and the second output signal.
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