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    Power factor correction in and dimming of solid state lighting devices
    3.
    发明授权
    Power factor correction in and dimming of solid state lighting devices 有权

    公开(公告)号：US09814110B1

    公开(公告)日：2017-11-07

    申请号：US14095678

    申请日：2013-12-03

    Applicant: Maxim Integrated Products, Inc.

    Inventor： Suresh Hariharan

    IPC: H05B33/08

    CPC classification number: H05B33/0845 ,  H05B33/0815 ,  H05B33/0896 ,  Y02B20/348 ,  Y02B20/383

    Abstract: An apparatus and method provides a driver circuit that provides for power factor correction (PFC) to a load, such as a solid-state lighting (SSL) device, such as, for example, a light emitting diode (LED) or an array or cluster of LEDs. A programmable reference is provided in the circuit to operate in a fixed frequency peak current mode control (FFPCMC) or in a fixed frequency average current mode control (FFACMC). A driver circuit is employed to operate the SSL device using power derived from a main power source which may be DC or AC. In a FFPCMC embodiment, a programmable power reference is programmed to be a fixed DC voltage. In a FFACMC embodiment, source input current to the circuit can be programmed to be proportional to the rectified AC voltage after a bridge rectifier.

    LED driver systems and methods
    4.
    发明授权
    LED driver systems and methods 有权

    公开(公告)号：US11190103B2

    公开(公告)日：2021-11-30

    申请号：US16599585

    申请日：2019-10-11

    Applicant: Maxim Integrated Products, Inc.

    Inventor： Suresh Hariharan

    IPC: H02M3/158 ,  H02M3/07 ,  H05B45/37

    Abstract: Described herein are embodiments for systems and methods LED driver. In one or more embodiments, the LED driver may operate in a boost mode to charge a capacitor using a power source or in a boost mode to use the charged capacitor to provide current to a load, such as an LED string. In one or more embodiments, the LED driver uses a single inductor for boost mode operation or buck mode operation. Such embodiments simplify the LED driver and therefore provide an economic advantage. In one or more embodiments, the power source is disconnected in the buck mode, such that the capacitor may be discharged to a low voltage. Therefore, the capacitor may need smaller capacitance to deliver the same discharge energy which otherwise requires a capacitor with larger capacitance.

    Average current mode control architecture
    7.
    发明授权
    Average current mode control architecture 有权

    公开(公告)号：US10903745B1

    公开(公告)日：2021-01-26

    申请号：US14991396

    申请日：2016-01-08

    Applicant: Maxim Integrated Products, Inc.

    Inventor： Suresh Hariharan ,  Alfons Willy Leo Janssen

    IPC: H02M3/158 ,  H02M1/00

    Abstract: A new architecture for buck LED drivers and buck DC-DC converters is disclosed for providing response to both line and loads. The architecture uses a new average current mode control scheme that does not use an error amplifier to regulate the current in the inductor in the buck converter. Even though there is no oscillator the switching frequency remains constant over line and load. The architecture provides a low cost solution with very fast response times.

    ELIMINATING VISIBLE FLICKER IN LED-BASED DISPLAY SYSTEMS
    8.
    发明申请
    ELIMINATING VISIBLE FLICKER IN LED-BASED DISPLAY SYSTEMS 有权
    在基于LED的显示系统中消除可见闪光灯

    公开(公告)号：US20150194097A1

    公开(公告)日：2015-07-09

    申请号：US14290005

    申请日：2014-05-29

    Applicant: Maxim Integrated Products, Inc.

    Inventor： Gianluca Mariano ,  Suresh Hariharan

    IPC: G09G3/34

    CPC classification number: G09G3/32 ,  G09G2320/0247 ,  G09G2320/064

    Abstract: A system includes a driver circuit, a modulator circuit, and a reset circuit. The driver circuit drives a plurality of light emitting diodes via a switch. The switch is controlled by a first signal having a first frequency. The driver circuit controls brightness of the light emitting diodes based on a second signal including a plurality of pulses. The modulator circuit modulates the first signal using a direct sequence spread spectrum modulation. The direct sequence spread spectrum modulation uses a sequence generated based on the first signal. The reset circuit resets the modulator circuit at each of the plurality of pulses of the second signal. The modulator circuit repeats the sequence at each of the plurality of pulses of the second signal.

    Abstract translation: 系统包括驱动电路，调制器电路和复位电路。 驱动电路经由开关驱动多个发光二极管。 开关由具有第一频率的第一信号控制。 驱动电路基于包括多个脉冲的第二信号来控制发光二极管的亮度。 调制器电路使用直接序列扩频调制来调制第一信号。 直接序列扩频调制使用基于第一信号产生的序列。 复位电路在第二信号的多个脉冲中的每个脉冲处复位调制器电路。 调制器电路在第二信号的多个脉冲的每一个处重复序列。

    LED Current Control In A Dimmable LED Illumination System
    9.
    发明申请
    LED Current Control In A Dimmable LED Illumination System 有权
    LED电流控制在可调光LED照明系统中

    公开(公告)号：US20130113386A1

    公开(公告)日：2013-05-09

    申请号：US13660676

    申请日：2012-10-25

    Applicant: Maxim Integrated Products, Inc.

    Inventor： Suresh Hariharan

    IPC: H05B37/02

    CPC classification number: H05B33/0842 ,  H05B33/086 ,  H05B37/02 ,  Y02B20/348

    Abstract: The invention relates to a light emitting diode (“LED”) illumination system, and more particularly, to systems, devices and methods of driving a LED module by a current generator that is powered and controlled by a regulated dc voltage associated with a brightness level. Such a dimmable LED illumination system is compatible with both a high-voltage ac signal coupled from any wall outlet and a low-voltage ac signal provided by an electronic transformer. A diode bridge rectifies the ac signal to a rectified ac signal, and a LED driver generates the LED current from the rectified ac signal and drives the LED to the brightness level. Within the LED driver, the level of the LED current is determined from a boost voltage that is substantially a regulated dc voltage generated from the rectified ac signal.

    Abstract translation: 本发明涉及一种发光二极管（“LED”）照明系统，更具体地说，涉及通过电流发生器驱动LED模块的系统，设备和方法，电流发生器由与亮度级相关联的调节直流电压供电和控制 。 这种可调光LED照明系统与从任何墙壁插座耦合的高压交流信号和由电子变压器提供的低压交流信号兼容。 二极管桥将交流信号整流到整流交流信号，LED驱动器从整流交流信号产生LED电流，并将LED驱动到亮度级。 在LED驱动器内，LED电流的电平由升压电压决定，该升压电压基本上是由整流后的交流信号产生的稳压直流电压。

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