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公开(公告)号：US09232619B2
公开(公告)日：2016-01-05
申请号：US14290669
申请日：2014-05-29
Applicant: DELTA ELECTRONICS, INC.
Inventor： Ching-Ho Chou , Yung-Chuan Lu , Yen-Yu Chen
IPC: H05B37/02 , H05B41/282
CPC classification number: H05B41/2828 , H05B37/02
Abstract: A fluorescent electronic ballast including: a rectifier circuit, for receiving an AC power supply and converting the AC power supply into a DC power supply; an inverter circuit, coupled to a fluorescent driver circuit, for converting the DC power supply into a high-frequency AC power supply for driving a fluorescent; and a detection protection circuit, coupled to the rectifier circuit and the inverter circuit, for detecting the DC power supply provided by the rectifier circuit, and cutting off the electric connection between a control chip of the inverter circuit and all of power supply when the voltage of the direct current power supply is lower than a predetermined value, wherein the power supply at least includes the direct current power supply provided by the rectifier circuit.
Abstract translation: 一种荧光电子镇流器，包括：整流器电路，用于接收AC电源并将AC电源转换成DC电源; 耦合到荧光驱动电路的逆变器电路，用于将DC电源转换成用于驱动荧光的高频AC电源; 以及与整流电路和逆变器电路耦合的检测保护电路，用于检测由整流电路提供的直流电源，并且当电压为5V时，切断逆变电路的控制芯片与所有电源之间的电连接 所述直流电源低于预定值，其中所述电源至少包括由所述整流电路提供的直流电源。
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公开(公告)号：US11991797B2
公开(公告)日：2024-05-21
申请号：US18155509
申请日：2023-01-17
Applicant: DELTA ELECTRONICS, INC.
Inventor： Ching-Ho Chou , Yung-Chuan Lu
IPC: H05B45/10 , H05B45/3725
CPC classification number: H05B45/10 , H05B45/3725
Abstract: A LED power supply with bi-level dimming receives an input voltage to supply power to an LED lamp, and adjusts the brightness of the LED lamp according to whether an external detection switch is triggered to be turned on. The LED power supply includes a conversion circuit, a switch, and an oscillation circuit. The conversion circuit converts the input voltage into an output voltage, and provides the output voltage to supply power to the LED lamp so as to control the LED lamp to provide a first brightness. The oscillation circuit provides a dimming signal with a fixed frequency and a duty cycle to the switch when the external detection switch is turned on so as to turn on and turn off the switch. The switch correspondingly adjusts the output voltage according to the dimming signal to control the LED lamp to provide a second brightness.
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公开(公告)号：US20250098048A1
公开(公告)日：2025-03-20
申请号：US18740782
申请日：2024-06-12
Applicant: Delta Electronics, Inc.
Inventor： Ching-Ho Chou , Yung-Chuan Lu , Tsung-Ta Wu , Chien-Ting Lin
IPC: H05B45/325 , H05B45/10
Abstract: An LED driver, an LED lighting system and an operating method thereof are provided. The LED driver is for driving an LED light source and includes a strobe circuit and a DC-DC converter. The strobe circuit generates a low-frequency modulation signal. The DC-DC converter is coupled to the strobe circuit and is configured to provide an adjustable operating current to the LED light source according to a DC signal and the low-frequency modulation signal. The operating current includes a DC current signal and a low-frequency AC current signal corresponding to the DC signal and the low-frequency modulation signal respectively. A frequency of the low-frequency AC current signal is between 25 Hz and 100 Hz, and a current ripple factor, equaling a difference of a maximum value and a minimum value of the operating current divided by a sum of the maximum value and the minimum value, is less than 8%.
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公开(公告)号：US11646655B2
公开(公告)日：2023-05-09
申请号：US17443787
申请日：2021-07-27
Applicant: Delta Electronics, Inc.
Inventor： Ching-Ho Chou , Yung-Chuan Lu
CPC classification number: H02M3/01 , H02M1/0009 , H02M3/33571 , H02M3/33573
Abstract: A control method for an LLC resonant converter includes the following steps. Firstly, the LLC resonant converter is enabled. Then, the sonant converter is operated in a first modulation mode, so that the magnitude of the output voltage is greater than or equal to an intermediate voltage value. When the magnitude of the output current is greater than zero, a determining step is performed to determine whether the magnitude of the output voltage is greater than a reference voltage value. When the determining result is satisfied, the LLC resonant converter is operated in the first modulation mode. When the determining result is not satisfied, the LLC resonant converter is operated in a second modulation mode, so that the magnitude of the output voltage is lower than the intermediate voltage value.
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公开(公告)号：US20220271655A1
公开(公告)日：2022-08-25
申请号：US17443787
申请日：2021-07-27
Applicant: Delta Electronics, Inc.
Inventor： Ching-Ho Chou , Yung-Chuan Lu
Abstract: A control method for an LLC resonant converter includes the following steps. Firstly, the LLC resonant converter is enabled. Then, the sonant converter is operated in a first modulation mode, so that the magnitude of the output voltage is greater than or equal to an intermediate voltage value. When the magnitude of the output current is greater than zero, a determining step is performed to determine whether the magnitude of the output voltage is greater than a reference voltage value. When the determining result is satisfied, the LLC resonant converter is operated in the first modulation mode. When the determining result is not satisfied, the LLC resonant converter is operated in a second modulation mode, so that the magnitude of the output voltage is lower than the intermediate voltage value.
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Patent Agency Ranking
公开(公告)号：US10152068B1
公开(公告)日：2018-12-11
申请号：US15896082
申请日：2018-02-14
Applicant: DELTA ELECTRONICS, INC.
Inventor： Yung-Chuan Lu , Ching-Ho Chou
Abstract: An electrical ballast includes an inverter circuit and a detection circuit. The inverter circuit is configured to receive a dc voltage and provide an output voltage to a lighting module. The detection circuit is electrically coupled to the inverter circuit and a voltage source, and configured to detect an ac voltage signal in the inverter circuit, and pull down the voltage source from a supply level to an under voltage locking level to shut down the inverter circuit on the condition that the ac voltage signal is greater than a threshold value, and restart the inverter circuit after a delay period.
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公开(公告)号：US20240430999A1
公开(公告)日：2024-12-26
申请号：US18398364
申请日：2023-12-28
Applicant: Delta Electronics, Inc.
Inventor： Ching-Ho Chou , Yung-Chuan Lu
Abstract: An LED power supply is provided. The LED power supply adopts constant-voltage/constant-current control, supplies power to an LED device, and includes an isolated DC-DC conversion circuit having primary and secondary sides and a control module. The control module includes a control unit, a feedback circuit, first and second switches and an optocoupler. The control unit is electrically connected to the primary side and controls operation of the conversion circuit. The optocoupler is configured for signal transmission with electrical isolation and includes a transmitter and a receiver electrically connected to the secondary side and the control unit respectively. When the output voltage is lower than a threshold voltage, the first switch is turned off, the second switch is turned on to trigger the optocoupler to generate a trigger signal at the receiver, and the control unit controls the isolated DC-DC conversion circuit to stop operating based on the trigger signal.
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公开(公告)号：US11388800B2
公开(公告)日：2022-07-12
申请号：US16848836
申请日：2020-04-15
Applicant: DELTA ELECTRONICS, INC.
Inventor： Ching-Ho Chou , Yung-Chuan Lu
Abstract: An operating method for a light-emitting diode (LED) power supply includes the following operations: controlling an output voltage to be a first voltage by a control circuit; detecting a load current by a detection circuit; maintaining the output voltage as the first voltage by a constant voltage control circuit when the load current is greater than zero, changing the output voltage from the first voltage to a second voltage by the control circuit when the load current is equal to zero, and the second voltage being greater than the first voltage.
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公开(公告)号：US20180108281A1
公开(公告)日：2018-04-19
申请号：US15474422
申请日：2017-03-30
Applicant: DELTA ELECTRONICS, INC.
Inventor： Yung-Chuan Lu , Ching-Ho Chou
IPC: G09F13/00 , H05B33/08 , H05B41/392 , H05B41/295
CPC classification number: G09F13/005 , H05B33/0815 , H05B33/083 , H05B41/295 , H05B41/3925
Abstract: An electronic ballast system for signage light includes a first lamp string, a second lamp string, a first inverter and a second inverter. The first lamp string includes at least one first lamp tube. The second lamp string is connected with the first lamp string in series, and includes at least one second lamp tube. The first inverter is connected with the first lamp string for driving illumination of the first lamp string. The second inverter is connected with the second lamp string for driving illumination of the second lamp string. A frequency difference between a frequency of the first inverter and a frequency of the second inverter is in a range between 500 Hz and 5 kHz.
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公开(公告)号：US09648690B1
公开(公告)日：2017-05-09
申请号：US15141419
申请日：2016-04-28
Applicant: Delta Electronics, Inc.
Inventor： Ching-Ho Chou , Yung-Chuan Lu
IPC: H05B37/02 , H05B33/08 , H05B41/392 , H05B41/298
CPC classification number: H05B33/0845 , H05B33/0815 , H05B33/0887 , H05B37/02 , H05B41/2828 , H05B41/2983 , H05B41/3921
Abstract: A dimmable instant-start ballast for a plurality of LED lamps and/or a plurality of fluorescent lamps is provided, which includes an isolated dimming interface, a duty control device, a dimming switch, and an inverter circuit. The isolated dimming interface receives a dimming signal to generate a dimming voltage. The duty control device generates an operation signal according to the dimming voltage. The dimming switch periodically couples a first node to a ground according to the operation signal. The inverter circuit receives a rectified voltage and is coupled to the first node. When the first node is coupled to the ground terminal, the inverter circuit provides a lamp current for the LED lamps and/or the fluorescent lamps.
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