公开(公告)号：US20230344347A1

公开(公告)日：2023-10-26

申请号：US18134461

申请日：2023-04-13

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan ,  Ron Vincent Ocampo

IPC: H02M3/158 ,  H05B45/3725

CPC classification number: H02M3/1582 ,  H05B45/3725

Abstract: Presented are systems and methods for improving transient response in buck-boost circuits avoid circuit instabilities in both boost mode and buck mode. In embodiments, this is accomplished when, in response to determining that the circuit operates in buck mode, a compensation circuit is adjusted to operate at a first bandwidth. In response to determining that the circuit operates in boost mode, the compensation circuit may then be adjusted to decrease a boost mode crossover frequency and operate at a second, lower bandwidth.

公开(公告)号：US09542880B2

公开(公告)日：2017-01-10

申请号：US14290005

申请日：2014-05-29

Applicant: Maxim Integrated Products, Inc.

Inventor： Gianluca Mariano ,  Suresh Hariharan

IPC: G09G3/34 ,  G09G3/32

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。

公开(公告)号：US12219677B2

公开(公告)日：2025-02-04

申请号：US18134461

申请日：2023-04-13

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan ,  Ron Vincent Ocampo

IPC: H05B45/30 ,  H02M1/00 ,  H02M1/08 ,  H02M1/32 ,  H02M3/158 ,  H05B45/36 ,  H05B45/3725 ,  H05B45/375 ,  H05B45/38

Abstract: Presented are systems and methods for improving transient response in buck-boost circuits avoid circuit instabilities in both boost mode and buck mode. In embodiments, this is accomplished when, in response to determining that the circuit operates in buck mode, a compensation circuit is adjusted to operate at a first bandwidth. In response to determining that the circuit operates in boost mode, the compensation circuit may then be adjusted to decrease a boost mode crossover frequency and operate at a second, lower bandwidth.

公开(公告)号：US20230345602A1

公开(公告)日：2023-10-26

申请号：US18131407

申请日：2023-04-06

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan ,  Ron Vincent Ocampo

IPC: H05B45/375 ,  H05B45/38 ,  H05B45/36

CPC classification number: H05B45/375 ,  H05B45/36 ,  H05B45/38

Abstract: Presented are systems and methods for controlling a compensation circuit. In embodiments, a detection circuit receives a set of control signals that have been generated by a control circuit to drive a set of light emitting diode (LED) switches. The switches control a set of LEDs driven by a DC-DC converter that is coupled to a feedback loop to which the compensation circuit is removably coupled. In embodiments, the detection circuit determines whether the status of an LED is about to change and, in response, uses the compensation circuit to control the feedback loop in a manner such as to reduce a current overshoot or current undershoot in the LED current.

公开(公告)号：US20230344340A1

公开(公告)日：2023-10-26

申请号：US18134459

申请日：2023-04-13

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan ,  Ron Vincent Ocampo

IPC: H02M3/158 ,  H02M1/08 ,  H02M1/00 ,  H02M1/32

CPC classification number: H02M3/158 ,  H02M1/083 ,  H02M1/0009 ,  H02M1/32 ,  H02M1/0012 ,  H02M1/0058

Abstract: Presented are average current mode control systems and methods for driving a load with a constant current. In embodiments, this is accomplished when, in response to a zero-current detection circuit detecting a zero current condition in the load current, a compensation circuit is disconnected from a first error amplifier to enable that error amplifier to provide a first voltage to a second error amplifier. The second error amplifier increases a charging current in a capacitor to reduce a dead time in the load current. Similarly, in response to an overcurrent detection circuit detecting an overcurrent condition in the load current, the compensation circuit is disconnected from the first error amplifier to enable the first error amplifier to provide a second voltage to the second error amplifier to decrease the charging current and reduce an overshoot condition.

公开(公告)号：US20230247741A1

公开(公告)日：2023-08-03

申请号：US18088529

申请日：2022-12-24

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan ,  Ron Vincent Ocampo ,  Ramesh Selvaraj

IPC: H05B45/54 ,  H05B45/375 ,  H05B45/38 ,  H05B45/345 ,  H05B45/325 ,  H05B45/36

CPC classification number: H05B45/54 ,  H05B45/375 ,  H05B45/38 ,  H05B45/345 ,  H05B45/325 ,  H05B45/36

Abstract: Described are light emitting diode (LED) and non-LED driver systems and methods that reduce current overshoot and, deadtime, and other undesirable effects in applications such as adaptive driving beam headlamp application that negatively impact circuit parameters, including efficiency. In certain embodiments, this is accomplished by using a current clamp circuit that is controlled such as to limit an overshoot in load current, e.g., when a number of LEDs that are turned on changes.

公开(公告)号：US09131565B2

公开(公告)日：2015-09-08

申请号：US13863285

申请日：2013-04-15

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan

IPC: H05B39/04 ,  H05B33/08

CPC classification number: H05B33/0815 ,  Y10T307/826

Abstract: Various embodiments of the invention allow LED lamp fixtures to pass EMI testing irrespective of whether the lamp fixture is operated by a magnetic transformer or an electric transformer without causing input current waveform distortion and without defeating transformer compatibility. In certain embodiments, the type of transformer is determined based on detecting characteristic voltage waveforms and based that determination an EMI filter is automatically switched in and out of the lamp circuit.

Abstract translation: 本发明的各种实施例允许LED灯具通过EMI测试，而不管灯具是否由磁变压器或电变压器操作，而不会导致输入电流波形失真并且不破坏变压器兼容性。 在某些实施例中，基于检测特征电压波形确定变压器的类型，并且基于EMI滤波器自动切换进入灯电路的确定。

公开(公告)号：US20140139107A1

公开(公告)日：2014-05-22

申请号：US13863285

申请日：2013-04-15

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan

IPC: H05B33/08 ,  H02J1/00

CPC classification number: H05B33/0815 ,  Y10T307/826

Abstract: Various embodiments of the invention allow LED lamp fixtures to pass EMI testing irrespective of whether the lamp fixture is operated by a magnetic transformer or an electric transformer without causing input current waveform distortion and without defeating transformer compatibility. In certain embodiments, the type of transformer is determined based on detecting characteristic voltage waveforms and based that determination an EMI filter is automatically switched in and out of the lamp circuit.

Abstract translation: 本发明的各种实施例允许LED灯具通过EMI测试，而不管灯具是否由磁变压器或电变压器操作，而不会导致输入电流波形失真并且不破坏变压器兼容性。 在某些实施例中，基于检测特征电压波形确定变压器的类型，并且基于EMI滤波器自动切换进入灯电路的确定。

公开(公告)号：US08704460B2

公开(公告)日：2014-04-22

申请号：US13660676

申请日：2012-10-25

Applicant: Maxim Integrated Products, Inc.

Inventor： Suresh Hariharan

IPC: H05B37/02 ,  H05B33/08

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。