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公开(公告)号：US20230119541A1
公开(公告)日：2023-04-20
申请号：US17965938
申请日：2022-10-14
发明人： Zhan Chen , Qiukai Huang , Jin Jin , Guiying Zhang
摘要： A method of controlling a switch-mode converter can include: obtaining an overcurrent reference threshold according to an output voltage sampling signal indicative of an output voltage of the switch-mode converter; and generating an over current protection triggering signal in response to an output current sampling signal indicative of an output current of the switch-mode converter and the overcurrent reference threshold meet a predetermined criterion, thereby triggering the switch-mode converter to enter a protection state.
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公开(公告)号：US11114931B2
公开(公告)日：2021-09-07
申请号：US16594287
申请日：2019-10-07
发明人： Qiukai Huang , Jian Deng
摘要： An AC-DC power converter can include: a front-stage power circuit; a rear-stage power circuit configured to share one power switch as a main power switch with the front-stage power circuit, where the rear-stage power circuit is coupled to a load, and a first magnetic component of the front-stage power circuit and a second magnetic component of the rear-stage power circuit are not coupled in one conductive loop from a positive terminal of a DC input voltage to a negative terminal of the DC input voltage; and an energy storage capacitor coupled to the front-stage power circuit and the rear-stage power circuit, where a common node of the first and second magnetic components is directly coupled to the power switch.
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公开(公告)号：US10886854B2
公开(公告)日：2021-01-05
申请号：US15670642
申请日：2017-08-07
发明人： Qiukai Huang , Xiaoru Xu
摘要： A control circuit can include: a power supply circuit having a bias capacitor coupled between a power terminal and a common node, where the power supply circuit supplies power to the control circuit via the bias capacitor; a detection circuit coupled between the common node and a current output terminal of a main power switch of a power stage circuit, to detect current flowing through the main power switch; a current feedback circuit that generates a feedback signal according to a difference value between a sense value obtained from a voltage at the power terminal during an off state of the main power switch and a present voltage at the power terminal, where the feedback signal represents an inductor current of the power stage circuit; and a control signal generator that generates a control signal according to the feedback signal to control the main power switch.
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公开(公告)号：US20190191506A1
公开(公告)日：2019-06-20
申请号：US16210102
申请日：2018-12-05
发明人： Qiukai Huang , Jianxin Wang , Qingliang Zheng
IPC分类号： H05B33/08
CPC分类号： H05B33/0815 , H05B33/0848 , Y02B20/346
摘要： A power converter for an LED driver, can include: an input capacitor circuit coupled between input terminals of the power converter and being configured to receive an output signal of a rectifier circuit; a transistor coupled in series with an LED load; and a control circuit configured to regulate a capacitance value of the input capacitor circuit to regulate an input current, and to control the transistor to regulate a current flowing through the LED load.
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公开(公告)号：US20180310376A1
公开(公告)日：2018-10-25
申请号：US15955853
申请日：2018-04-18
发明人： Qiukai Huang , Jianxin Wang , Huiqiang Chen
IPC分类号： H05B33/08
CPC分类号： H05B33/0845 , H05B33/0809 , H05B33/0824
摘要： An apparatus can include: a bleeder circuit coupled to a DC bus of an LED driver having a silicon-controlled dimmer; the bleeder circuit being configured to control a voltage of the DC bus to vary in a predetermined manner by drawing a bleed current through a bleed path when in a first mode, and to cut off the bleed path when in a second mode; and a controller configured to control the bleeder circuit to be in the first mode before the silicon-controlled dimmer is turned on.
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公开(公告)号：US10069406B2
公开(公告)日：2018-09-04
申请号：US15368770
申请日：2016-12-05
发明人： Qiukai Huang , Jian Deng
摘要： An EMI filter configured for an AC-DC switching power supply, and that is coupled between a DC-DC converter and a rectifier circuit that receives an AC power supply, can include: an input capacitor coupled in parallel to input terminals of the DC-DC converter; a transistor having a first terminal coupled to a first terminal of the input capacitor, and a second terminal coupled to ground; and a control circuit configured to generate a control signal that controls the transistor according to a feedback voltage that represents ripple information of an input voltage to the DC-DC converter, and at least one of a current that flows through the transistor, and a voltage at the first terminal of the transistor, where the control signal is used to regulate the voltage at the first terminal of the transistor to substantially eliminate switching frequency ripples from an input current of the DC-DC converter.
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7.发明申请公开(公告)号：US20180241314A1
公开(公告)日：2018-08-23
申请号：US15958207
申请日：2018-04-20
发明人： Shaobin Zhang , Yongjiang Bai , Zhiliang Hu , Qiukai Huang
摘要： A method of controlling an isolated converter can include: (i) sampling and holding an output voltage of the isolated converter during a present switching cycle to generate a reference voltage signal that is proportional to the output voltage; (ii) comparing, in a predetermined time interval before a next switching cycle, the output voltage against the reference voltage signal, and activating a wake-up signal when the output voltage is less than the reference voltage signal, in order to control a voltage at a secondary winding to represent a variation of the output voltage; (iii) detecting a voltage of the primary winding or the secondary winding, and generating a voltage detection signal; and (iv) controlling the power switch according to the voltage detection signal, in order to maintain the output voltage as an expected voltage.
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公开(公告)号：US09999106B2
公开(公告)日：2018-06-12
申请号：US15416049
申请日：2017-01-26
发明人： Qiukai Huang , Jian Deng
CPC分类号： H05B33/0851 , H02M3/155 , H02M3/33507 , H02M2001/007 , H05B33/0815 , H05B33/0818
摘要： A dimming circuit for adjusting the brightness of an LED load, can include: a primary controlled flyback converter having a primary-side circuit, a first secondary-side circuit, and a second secondary-side circuit; a DC-DC converter coupled in a cascade arrangement with the second secondary-side circuit, where an output node of the DC-DC converter is coupled in series to an output node of the first secondary-side circuit; a control circuit configured to control, according to a dimming signal that represents an expected output current of the dimming circuit, a power switch of the primary controlled flyback converter to adjust output voltages of the first and second secondary-side circuits, to adjust a power that is provided to the LED load; and the control circuit being configured to control a power switch of the DC-DC converter according to the dimming signal, such that the DC-DC converter operates within a predetermined state range.
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公开(公告)号：US20180139812A1
公开(公告)日：2018-05-17
申请号：US15867935
申请日：2018-01-11
发明人： Qiukai Huang , Jian Deng
CPC分类号： H05B33/0815 , G05F1/56
摘要： A ripple suppression circuit configured to suppress a current ripple provided to a load by a DC converter, can include: a ripple voltage sampling circuit coupled to output terminals of the DC converter, where the ripple voltage sampling circuit is configured to generate a ripple reference voltage that represents a ripple voltage of an output voltage of the DC converter; and a voltage regulation circuit coupled to the load and the ripple voltage sampling circuit, where the voltage regulation circuit is controllable by the ripple reference voltage such that a voltage across the voltage regulation circuit is consistent with the ripple voltage.
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公开(公告)号：US09648677B2
公开(公告)日：2017-05-09
申请号：US14841832
申请日：2015-09-01
发明人： Jianxin Wang , Qiukai Huang
CPC分类号： H05B33/0815 , H02M3/1582 , H05B33/0827 , H05B33/0851
摘要： The present disclosure relates to LED driving circuit and method using a single inductor. A constant current controller controls a power stage circuit to provide a constant output signal, and thus to provide a constant current signal for an LED load. A dimming controller regulates luminance of the LED load. A constant voltage generating circuit receives the current signal at an output terminal of the power stage circuit and a reserve supply voltage for providing a supply voltage for the dimming controller. Compared with the prior art, the present disclosure does not need an independent power supply chip, and reduces components such as inductors and rectifying transistors. Thus, a peripheral circuit is simplified, and an overall size of the system is reduced.
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