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1.发明授权公开(公告)号：US09692316B1
公开(公告)日：2017-06-27
申请号：US14330440
申请日：2014-07-14
发明人： Young Chul Ryu , Chang Qian , Wanfeng Zhang
CPC分类号： H02M5/2573 , H05B33/0815 , H05B33/0845 , Y02B20/346
摘要： Power converters having bleeder circuits are disclosed. For example, in an embodiment, a power converter can include a controllable TRIAC in series with a rectifier that together produces a controllable rectified voltage at a first node, a first inductor having a first end and a second end, the first inductor being electrically connected to the first node at the first end, and electrically connected to a first power lead of a transistor and an anode of a diode at the second end, a load capacitor having a first end and a second end, the load capacitor being electrically coupled to the first node at the first end of the load capacitor, and electrically coupled to a cathode of the diode at the second end the load capacitor, control circuitry to control switching of the transistor, and a bleeder circuit coupled to the second end of the inductor, the bleeder circuit including a resistor in series with a coupling capacitor.
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公开(公告)号：US09608527B1
公开(公告)日：2017-03-28
申请号：US14621310
申请日：2015-02-12
发明人： Jinho Choi , Hao Peng , Biing Long Shu , Wanfeng Zhang
CPC分类号： H02M3/33507 , H02M1/36 , H02M2001/0006
摘要： An apparatus includes an energy storage device, a driver circuit configured to receive energy from the energy storage device, and a bleed circuit configured to reduce an amount of the energy received by the driver circuit from the energy storage device. The bleed circuit is configured to reduce the amount of the energy received by the driver circuit during a startup period. The energy storage device may include a transformer, the driver circuit and bleed circuit being coupled to first and second windings of the transformer, respectively. A method includes receiving, by a driver circuit, energy from an energy storage device, and reducing, using a bleed circuit, the energy received by the driver circuit during a startup period. The energy storage device may include a transformer, the driver circuit and bleed circuit being coupled to first and second windings of the transformer, respectively.
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公开(公告)号：US09185760B1
公开(公告)日：2015-11-10
申请号：US13648455
申请日：2012-10-10
发明人： Jinho Choi , Hao Peng , Wanfeng Zhang , Tuyen Doan
CPC分类号： H02M1/10 , G01R19/2503 , G01R19/2513 , H02M3/33507 , H02M7/06 , H05B33/0809 , H05B33/0824 , H05B33/0845 , H05B33/0884
摘要： In various embodiments, there is provided a method comprising receiving a waveform; rectifying the waveform to generate a rectified waveform; comparing the rectified waveform with a first voltage to generate a first compare signal, wherein a first edge of the first compare signal occurs at a first time when an instantaneous value of the rectified waveform becomes higher than the first voltage; comparing the rectified waveform with a second voltage to generate a second compare signal, wherein a first edge of the second compare signal occurs at a second time when the instantaneous value of the rectified waveform becomes higher than the second voltage; and based at least in part on the first time and the second time, estimating a voltage of the waveform.
摘要翻译： 在各种实施例中，提供了一种方法，包括：接收波形; 整流波形以产生整流波形; 将整流波形与第一电压进行比较以产生第一比较信号，其中当整流波形的瞬时值变得高于第一电压时，第一比较信号的第一边沿出现在第一时间; 将整流波形与第二电压进行比较以产生第二比较信号，其中当所述整流波形的瞬时值变得高于所述第二电压时，所述第二比较信号的第一边沿在第二时间发生; 并且至少部分地基于第一次和第二次估计波形的电压。
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公开(公告)号：US08937435B1
公开(公告)日：2015-01-20
申请号：US14011253
申请日：2013-08-27
发明人： Sehat Sutardja , Wanfeng Zhang
IPC分类号： H05B37/02
CPC分类号： H05B33/0815 , Y02B20/346 , Y02B20/348
摘要： Aspects of the disclosure provide a circuit that includes a first circuit, a second circuit and a bridge circuit. The first circuit is coupled to a magnetic component to receive electric energy transferred via the magnetic component and thus configured to store the electric energy and generate a supply voltage. The second circuit is also coupled to the magnetic component. The second circuit is switchable and is configured to deplete a portion of the electric energy when the second circuit is switched on. The bridge circuit is coupled between the first circuit and the second circuit to provide a charge flow path when the second circuit is switched off.
摘要翻译： 本公开的方面提供了包括第一电路，第二电路和桥接电路的电路。 第一电路耦合到磁性部件以接收经由磁性部件传送的电能，并因此被配置成存储电能并产生电源电压。 第二电路也耦合到磁性部件。 第二电路是可切换的并且被配置为在第二电路接通时耗尽一部分电能。 桥接电路耦合在第一电路和第二电路之间，以在第二电路被切断时提供电荷流动路径。
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公开(公告)号：US09246395B1
公开(公告)日：2016-01-26
申请号：US14687546
申请日：2015-04-15
发明人： Jinho Choi , Hao Peng , Wanfeng Zhang , Tuyen Doan
IPC分类号： H02M3/335
CPC分类号： H02M3/33507 , H02M3/33523
摘要： Embodiments include circuits and methods to determine peak current for current regulation. A control signal circuit monitors a current on the primary side of a transformer based a turn on time of a switch coupled to the primary side. The control signal circuit determines whether the monitored current exceeds an over-current protection threshold, and determines a duration that the monitored current exceeds the over-current protection threshold. The control signal circuit determines a peak primary current in the primary side based on the over-current protection threshold, the duration that the monitored current exceeds the over-current protection threshold, and the turn on time of the switch. The control signal circuit controls the turn on time for the switch based on the determined peak primary current.
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公开(公告)号：US09220138B1
公开(公告)日：2015-12-22
申请号：US14560742
申请日：2014-12-04
发明人： Wanfeng Zhang , Hao Peng
CPC分类号： H05B33/0815 , H02M1/32 , H02M3/33507 , H02M2001/0022 , H05B33/0845
摘要： Power lighting control methods and systems for solid state lighting are disclosed. For example, a power control system includes a transformer that includes a primary coil configured to receive a first voltage based on an output of a switching circuit, a secondary coil configured to generate a first current based on the first voltage to power a solid-state load, and a bleeder coil coupled to a bleeder switch, and a control module that causes the bleeder switch to turn on incrementally during a dimming event over M power cycles, where M is a positive integer, so as to eliminate or reduce a current step in the first current provided to the solid state load.
摘要翻译： 公开了用于固态照明的功率照明控制方法和系统。 例如，功率控制系统包括变压器，其包括被配置为基于开关电路的输出接收第一电压的初级线圈，次级线圈，其被配置为基于第一电压产生第一电流以为固态供电 负载和耦合到泄放开关的泄放线圈，以及控制模块，其使得放电开关在M个功率周期的调光事件期间递增地导通，其中M是正整数，以便消除或减少当前步骤 在提供给固态负载的第一电流中。
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公开(公告)号：US09490695B1
公开(公告)日：2016-11-08
申请号：US14016869
申请日：2013-09-03
发明人： Sai Bun Wong , Lionel Barrow , Sofjan Goenawan , Gary Chen , Jerry Su , Wanfeng Zhang
CPC分类号： H02M3/02 , H02M3/157 , H05B33/0827 , H05B33/0851
摘要： Aspects of the disclosure provide a circuit that includes a switch control circuit and a timing control circuit. The switch control circuit is configured to enable/disable a pulse width modulation (PWM) switch control to a regulator to transfer power to a load. The timing control circuit is configured to enable an analog to digital converter (ADC) to convert an analog signal to a digital stream when the PWM switch control is disabled in order to reduce noise in the digital stream due to switching activities in the regulator.
摘要翻译： 本公开的方面提供了包括开关控制电路和定时控制电路的电路。 开关控制电路被配置为启用/禁用对调节器的脉冲宽度调制（PWM）开关控制以将功率传递到负载。 定时控制电路被配置为使得当PWM开关控制被禁用时，模数转换器（ADC）能够将模拟信号转换为数字流，以便由于调节器中的开关活动而减少数字流中的噪声。
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公开(公告)号：US09356534B1
公开(公告)日：2016-05-31
申请号：US13751788
申请日：2013-01-28
发明人： Hao Peng , Wanfeng Zhang
CPC分类号： H02M7/12 , H02M1/4225 , H05B33/0815 , H05B33/0848 , Y02B20/346 , Y02B70/126
摘要： Aspects of the disclosure provide a method. The method includes regulating a time for turning on a switch to transfer energy via a transformer in a first control mode, determining a turn-on time for a second control mode based on the regulated time in the first control mode, and controlling the switch based on the determined turn-on time in the second control mode to transfer energy via the transformer.
摘要翻译： 本公开的方面提供了一种方法。 该方法包括：在第一控制模式中调节开关以经由变压器接通能量的时间，基于第一控制模式中的调节时间确定用于第二控制模式的接通时间，以及基于第 在第二控制模式中确定的接通时间通过变压器传递能量。
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公开(公告)号：US09144137B1
公开(公告)日：2015-09-22
申请号：US13856295
申请日：2013-04-03
发明人： Sehat Sutardja , Pantas Sutardja , Wanfeng Zhang
CPC分类号： H05B33/0815 , Y02B20/347
摘要： A controller for a buck regulator for a lighting system including light emitting diodes includes a voltage control loop configured to compare a voltage reference and a feedback voltage. The feedback voltage is based upon a DC supply voltage to the controller. A voltage regulator is configured to receive an output of the voltage control loop and to generate a current reference. A current control loop is configured to receive a feedback current and to compare the current reference to the feedback current. A current regulator is configured to receive an output of the current control loop. A pulse width modulation circuit is configured to receive an output of the current regulator and to generate drive signals for first and second switches of the buck regulator.
摘要翻译： 用于包括发光二极管的照明系统的降压调节器的控制器包括被配置为比较电压基准和反馈电压的电压控制回路。 反馈电压基于控制器的直流电源电压。 电压调节器被配置为接收电压控制回路的输出并产生电流参考。 电流控制回路被配置为接收反馈电流并且将电流参考值与反馈电流进行比较。 电流调节器被配置为接收电流控制回路的输出。 脉冲宽度调制电路被配置为接收电流调节器的输出并产生用于降压调节器的第一和第二开关的驱动信号。
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公开(公告)号：US08698423B2
公开(公告)日：2014-04-15
申请号：US13687249
申请日：2012-11-28
发明人： Wanfeng Zhang , Jinho Choi
IPC分类号： G05F1/00
CPC分类号： H05B33/0815 , H05B33/0818 , H05B33/0824 , H05B33/0857 , H05B37/02
摘要： A system includes a first solid-state lamp that generates a first illuminated output having a first color. A second solid-state lamp generates a second illuminated output having a second color. The second illuminated output is mixed with the first illuminated output to generate a third illuminated output having a third color. An inductor or a transformer includes a primary coil and a bias coil. A first circuit includes the primary coil and a first switch. The first circuit supplies power to the first solid-state lamp. A second circuit includes the bias coil and a second switch. The second circuit supplies power to the second solid-state lamp. A control module alters the third color including controlling (i) a state of the first switch to adjust current supplied to the first solid-state lamp, and (ii) a state of the second switch to adjust current supplied to the second solid-state lamp.
摘要翻译： 系统包括产生具有第一颜色的第一照明输出的第一固态灯。 第二固态灯产生具有第二颜色的第二照明输出。 第二照明输出与第一照明输出混合以产生具有第三颜色的第三照明输出。 电感器或变压器包括初级线圈和偏置线圈。 第一电路包括初级线圈和第一开关。 第一个电路为第一固态灯供电。 第二电路包括偏置线圈和第二开关。 第二电路向第二固态灯供电。 控制模块改变第三种颜色，包括控制（i）第一开关的状态以调节提供给第一固态灯的电流，以及（ii）第二开关的状态来调节提供给第二固态的电流 灯。
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