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公开(公告)号：US08860325B2
公开(公告)日：2014-10-14
申请号：US13723666
申请日：2012-12-21
发明人： Wei Chen
CPC分类号： H05B33/0809 , H05B33/0812 , H05B37/02
摘要： The present invention relates to a high efficiency LED driver and driving method thereof. In one embodiment, a high efficiency LED driving method configured for a LED device can include: (i) receiving a DC bus voltage and generating a driving voltage for the LED device through a power switch; (ii) comparing the DC bus voltage against a sum of the driving voltage and a first reference voltage; (iii) where when the DC bus voltage is greater than the sum of the driving voltage and the first reference voltage, generating a first output current; (iv) where when the DC bus voltage is greater than the driving voltage and less than the sum of the driving voltage and the first reference voltage, generating a second output current; and (v) matching an average current of the first output current and the second output current with a corresponding driving current.
摘要翻译： 本发明涉及一种高效率LED驱动器及其驱动方法。 在一个实施例中，配置用于LED器件的高效LED驱动方法可以包括：（i）通过电源开关接收DC总线电压并产生用于LED器件的驱动电压; （ii）将所述DC总线电压与所述驱动电压和第一参考电压的和进行比较; （iii）当直流母线电压大于驱动电压和第一参考电压之和时，产生第一输出电流; （iv）当直流母线电压大于驱动电压并小于驱动电压和第一参考电压之和时，产生第二输出电流; 和（v）将第一输出电流和第二输出电流的平均电流与相应的驱动电流进行匹配。
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公开(公告)号：US20140300333A1
公开(公告)日：2014-10-09
申请号：US14202085
申请日：2014-03-10
发明人： Wei Chen
CPC分类号： G01R19/25 , G01R19/0092 , H02M3/156 , H02M2001/0009
摘要： In one embodiment, a current detection circuit configured to determine an input current and an output current of a switching regulator, can include: (i) a mirror circuit configured to mirror a current flowing through a main power transistor of the switching regulator to generate a sampling signal that is in proportion to the main power transistor current; (ii) a current generating circuit configured to perform a first average value calculation of the sampling signal based on a switching cycle of the switching regulator to determine the input current; and (iii) the current generating circuit being configured to perform a second average value calculation of the sampling signal based on a conduction duty cycle of the main power transistor to determine the output current.
摘要翻译： 在一个实施例中，配置成确定开关调节器的输入电流和输出电流的电流检测电路可以包括：（i）镜电路，被配置为镜像流过开关调节器的主功率晶体管的电流，以产生 与主功率晶体管电流成比例的采样信号; （ii）电流产生电路，被配置为基于所述开关调节器的开关周期执行所述采样信号的第一平均值计算以确定所述输入电流; 和（iii）电流产生电路被配置为基于主功率晶体管的导通占空比执行采样信号的第二平均值计算，以确定输出电流。
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公开(公告)号：US20140239835A1
公开(公告)日：2014-08-28
申请号：US14272573
申请日：2014-05-08
发明人： Shenglun Chen , Wei Chen , Xiaoru Xu
IPC分类号： H05B33/08
CPC分类号： H05B33/0809 , H05B33/0845 , Y02B20/348
摘要： The present invention relates to an SCR dimming circuit and method for regulating the luminance of an LED load. In one embodiment, an SCR dimming circuit can include: an SCR element that generates a lack-phase AC voltage based on a sinusoidal AC supply; a rectifier bridge that generates a lack-phase DC voltage based on the lack-phase AC voltage; a conduction angle generator that receives the lack-phase DC voltage, and generates a controlling signal representative of a conduction angle of the SCR element; and a dimming signal generator that generates a dimming signal to regulate luminance of the LED load, where the dimming signal generator receives the controlling signal, an adjustable signal, and a clamping voltage, an amplitude of a dimming phase angle range is selected by a fixed signal determined by the clamping voltage, and the dimming phase angle range may be shifted by regulating the adjustable signal.
摘要翻译： 本发明涉及一种用于调节LED负载亮度的SCR调光电路和方法。 在一个实施例中，SCR调光电路可以包括：SCR元件，其基于正弦AC电源产生欠相AC电压; 整流桥，基于缺相交流电压产生欠相直流电压; 接收缺相相电压的导通角发生器，并产生表示SCR元件的导通角的控制信号; 以及调光信号发生器，其产生调光信号以调节LED负载的亮度，其中调光信号发生器接收控制信号，可调信号和钳位电压，通过固定的选择信号选择调光相位角范围的幅度 通过钳位电压确定的信号和调光相位角范围可以通过调节可调信号而偏移。
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公开(公告)号：US08687382B2
公开(公告)日：2014-04-01
申请号：US13855909
申请日：2013-04-03
发明人： Wei Chen
IPC分类号： H02M3/335
CPC分类号： H02M1/42 , H02M1/4258 , H02M3/33507 , H02M3/33561 , H02M7/10 , H02M2001/007 , Y02B70/126
摘要： The present invention discloses circuits and methods for high efficiency and fast response AC-DC voltage converters. In one embodiment, an AC-DC voltage converter can include: (i) a first stage voltage converter having an isolated topology with a power factor correction function, where the first stage voltage converter is configured to convert an AC input voltage to a series-connected N branches of first stage voltages, where N is a positive integer of at least two; (ii) a second stage voltage converter having a non-isolated topology, where the second stage voltage converter is configured to convert one of the N branches of the first stage voltages to a second stage voltage; and (iii) where the second stage voltage and a remaining of the N branches of the first stage voltages are configured to be series-connected and converted to a DC output voltage.
摘要翻译： 本发明公开了用于高效率和快速响应的AC-DC电压转换器的电路和方法。 在一个实施例中，AC-DC电压转换器可以包括：（i）具有功率因数校正功能的隔离拓扑的第一级电压转换器，其中第一级电压转换器被配置为将AC输入电压转换成串联电压， 连接的第一级电压的N个分支，其中N是至少两个的正整数; （ii）具有非隔离拓扑结构的第二级电压转换器，其中所述第二级电压转换器被配置为将所述第一级电压的N个分支中的一个转换为第二级电压; 和（iii）其中第二级电压和第一级电压的N个分支的剩余部分被配置为串联连接并转换成DC输出电压。
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85.发明申请CONTROL CIRCUITS AND CONTROL METHODS FOR FLYBACK CONVERTERS AND AC-DC POWER CONVERTERS THEREOF 有权逆变器转换器及其直流电源转换器的控制电路及控制方法公开(公告)号：US20130301309A1
公开(公告)日：2013-11-14
申请号：US13868942
申请日：2013-04-23
发明人： Wei Chen
IPC分类号： H02M3/335
CPC分类号： H02M3/33523 , H02M1/4258 , Y02B70/126
摘要： The present invention relates to control circuits and methods for a flyback converter and AC-DC power converters thereof. In one embodiment, a control circuit can include: (i) a turn-on signal generating circuit that is configured, in each switching cycle, to receive a drain-source voltage of a power switch of the flyback converter, and to activate a turn-on signal to turn on the power switch when the drain-source voltage reaches a valley value; (ii) a turn-off signal generating circuit that is configured, in each switching cycle, to activate a turn-off signal to turn off the power switch based on a power switch feedback error signal after a power switch conducting time interval has elapsed; and (iii) where input current and voltages of the flyback converter can be maintained as substantially in phase, and an output electrical signal of the flyback converter can be maintained as substantially constant.
摘要翻译： 本发明涉及用于反激式转换器及其AC-DC电力转换器的控制电路和方法。 在一个实施例中，控制电路可以包括：（i）导通信号发生电路，其被配置为在每个开关周期中接收反激式转换器的电源开关的漏 - 源电压，并且激活转向 - 当漏源电压达到谷值时，接通电源开关的信号; （ii）关闭信号发生电路，其被配置为在每个开关周期中，在电力开关导通时间间隔已经过去之后，基于功率开关反馈误差信号来激活关断信号来关闭电源开关; 和（iii）其中反激式转换器的输入电流和电压可以保持为基本上同相，并且反激转换器的输出电信号可以保持为基本恒定。
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公开(公告)号：US20130293213A1
公开(公告)日：2013-11-07
申请号：US13939520
申请日：2013-07-11
发明人： Wei Chen
IPC分类号： G05F1/10
CPC分类号： G05F1/10 , H02M1/32 , H02M1/36 , H02M2001/0025 , H03K17/0822 , H03K17/166 , H03K17/223
摘要： Methods and circuits related to power regulator start-up are disclosed. In one embodiment, a start-up circuit can include: (i) a delay circuit having a resistor and a capacitor, where the capacitor is coupled between ground and a common node; and (ii) a control chip that receives a reference voltage, and includes an input pin coupled to an input source, an output pin supplying power for a device, and a multiplexed pin coupled to the resistor at the common node to receive an enable signal. The start-up circuit outputs an electrical signal at the output pin based on a comparison of a voltage at the multiplexed pin against the reference voltage, and after a delay time determined by the capacitor and the reference voltage. The voltage at the multiplexed pin can increase continuously with a rising slope determined by input current flowing through the multiplexed pin during a start-up process.
摘要翻译： 公开了与功率调节器启动相关的方法和电路。 在一个实施例中，启动电路可以包括：（i）具有电阻器和电容器的延迟电路，其中电容器耦合在地和公共节点之间; 以及（ii）控制芯片，其接收参考电压，并且包括耦合到输入源的输入引脚，为器件供电的输出引脚和耦合到公共节点处的电阻器的多路复用引脚以接收使能信号 。 启动电路基于多路复用引脚上的电压与参考电压的比较，以及由电容器和参考电压确定的延迟时间之后，在输出引脚输出电信号。 在启动过程中，多路复用引脚上的电压可以随着流过复用引脚的输入电流确定的上升斜率而连续增加。
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公开(公告)号：US20230308029A1
公开(公告)日：2023-09-28
申请号：US18118818
申请日：2023-03-08
摘要： A lumped power supply circuit for converting an AC signal into a DC signal, the lumped power supply circuit including: a cascaded H-bridge circuit having N H-bridge sub-circuits connected in series between two input terminals of the AC signal, and being configured to convert the AC signal into N first voltage signals, where N is a positive integer greater than or equal to 2; a high-frequency filtering module configured to filter the N first voltage signals, and to generate N second voltage signals; a DC conversion module to receive the N second voltage signals, and to convert the N second voltage signals into at least one third voltage signal; and a lumped power buffer module having an output terminal coupled to a load, and being configured to receive the at least one third voltage signal, and to filter out part of power frequency fluctuations in the third voltage signal.
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公开(公告)号：US20230125514A1
公开(公告)日：2023-04-27
申请号：US17968946
申请日：2022-10-19
IPC分类号： H02M1/00
摘要： A cascade circuit can include: N power conversion units connected in series between two ports of a power supply, where N is a positive integer greater than or equal to 2; a controller connected to one of the N power conversion units, and being configured to send a signal to be transmitted through the connected power conversion unit; where each of the power conversion units is configured to send the signal to be transmitted to a next-stage power conversion unit when the each of the power conversion unit shares a reference voltage with the adjacent next-stage power conversion unit; and where the signal to be transmitted is controlled to be transmitted from a previous-stage power conversion unit to a next-stage power conversion unit in sequence until the signal to be transmitted is received by all of the N power conversion units.
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公开(公告)号：US11350503B2
公开(公告)日：2022-05-31
申请号：US17147640
申请日：2021-01-13
IPC分类号： H05B45/30 , H05B45/385 , H05B45/34 , H05B45/345 , H02M1/08 , H02M3/335 , H02M1/00
摘要： A power converter can include: an input circuit, including a primary winding and a primary power switch which are coupled in series between an input terminal and a first ground; at least one constant voltage output circuit, including a first secondary winding coupled with said primary winding; and at least one constant current output circuit, including a second secondary winding coupled with said primary winding, a secondary power switch, a current output port, a second rectifier circuit and a current sampling circuit. The second rectifier circuit can be coupled between the current output port and the second secondary winding, the current output port can be coupled to an LED as a load, the LED may be coupled between one end of the second secondary winding and a second ground, and the secondary power switch and the current sampling circuit can connect in series.
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公开(公告)号：US10356856B2
公开(公告)日：2019-07-16
申请号：US14475680
申请日：2014-09-03
发明人： Wei Chen
IPC分类号： H05B33/08
摘要： The present disclosure relates to a capacitor step-down LED driver and a driving method using the same. A capacitor step-down LED driver comprises a control circuit and a switching circuit. The control circuit turns on or off the switching circuit in response to an output current and an output voltage of the capacitor step-down LED driver, and thus controls an amount of energy supplied from an input side to an output side. In a first operation state, the switching circuit is controlled not to supply energy from the input side to the output side. In a second operation state, the switching circuit is controlled to supply energy from the input side to the output side. Thus, the output current is maintained to be a value of a desired driving current.
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