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公开(公告)号：US10362644B1
公开(公告)日：2019-07-23
申请号：US16032143
申请日：2018-07-11
发明人： Wei Xiong
摘要： A driver circuit includes a load control circuit for supplementing a light emitting diode (LED) load in a low load condition. The low load condition corresponds to an output voltage across the LED load below a predetermined threshold voltage. The driver circuit includes an isolation transformer. A primary side circuit is coupled to a primary winding of the isolation transformer and includes a constant current control integrated circuit (IC) and a switch. The constant current control IC controls an output current to the LED load. A load control circuit is coupled to across the LED load and includes an auxiliary load which ensures that the isolation transformer operates in a continuous mode. The auxiliary load supplements the LED load with in a low load condition, but not in a high load condition. The auxiliary load may be configured to quickly discharge an output capacitor in a power off condition.
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52.发明授权公开(公告)号：US10326377B1
公开(公告)日：2019-06-18
申请号：US16048867
申请日：2018-07-30
发明人： Wei Xiong , Travis L. Berry
摘要： A DC-to-AC inverter provides an AC voltage to the primary winding of an output isolation transformer having at least one secondary winding and having an auxiliary winding. The current supplied to a secondary load is reflected back into the primary winding as a reflected secondary current. A first feedback signal has a reflected secondary current component and has a primary magnetizing current component. An auxiliary winding voltage is applied to an inductor to generate an auxiliary current proportional to the primary winding magnetizing current. A second feedback signal is responsive to the auxiliary current. The second feedback signal is combined with the first feedback signal to produce a total feedback signal responsive only to the reflected secondary current. The DC-to-AC inverter responds to the total feedback signal and a reference signal to adjust the AC voltage to maintain the total feedback signal at a magnitude corresponding to the reference signal.
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公开(公告)号：US10320303B1
公开(公告)日：2019-06-11
申请号：US16120930
申请日：2018-09-04
发明人： Wei Xiong
摘要： A system and a method offset the effect of a reduced load current on a power factor controller connected to a DC-to-DC converter having a switching DC-to-AC inverter driving an output rectifier that produces the load current. A frequency-dependent load impedance is coupled to the output of the inverter. The frequency-dependent load impedance is configured to have a first impedance when the inverter is operating at the minimum operating frequency. The frequency-dependent load impedance has a second impedance when the inverter is operating at the maximum operating frequency. The second impedance is lower than the first impedance and produces a dummy load current that is added to the actual load current to provide a sufficient total load current to cause the power factor controller to operate in a continuous mode even when the actual load current is insufficient to cause the power factor controller to operate in a continuous mode.
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公开(公告)号：US09837194B1
公开(公告)日：2017-12-05
申请号：US15247203
申请日：2016-08-25
发明人： Donald Folker , Mike LeBlanc , Candice Ungacta , Wei Xiong
CPC分类号： H01F3/14 , H01F27/306 , H01F27/325 , H01F27/40
摘要： A magnetic assembly includes a single bobbin structure that supports a first coil and a second coil. A first E-core has a center leg positioned within the first coil. A second E-core has a center leg positioned within the second coil. An I-core is positioned between the first E-core and the second E-core. The I-core completes a first set of magnetic paths between the center leg and outer legs of the first E-core and also completes a second set of magnetic paths between the center leg and outer legs of the second E-core. The two E-cores and the I-core are stacked in a vertical E-I-E configuration with respect to a common set of pin rails. In one embodiment, the first coil and the first E-core are configured as a transformer; and the second coil and the second E-core are configured as an inductor.
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公开(公告)号：US09799442B1
公开(公告)日：2017-10-24
申请号：US14827425
申请日：2015-08-17
发明人： Donald Folker , Mike LeBlanc , James Neal Van Pelt
CPC分类号： H01F27/325 , H01F27/306 , H01F41/0206
摘要： A magnetic assembly includes a bobbin with two end flanges. A passageway extends longitudinally between the end flanges. An inner core extends through, and is centered in, the passageway. The inner core has first and second end surfaces, each surface proximate to one of the end flanges. A rectangular outer core is positioned around the bobbin with inner surfaces of the outer core close to the outer surfaces of the end flanges of the bobbin. A respective gap is formed between each end of the inner core and the adjacent inner surface of the outer core. The passageway includes crushable ribs that secure the inner core within the passageway. The outer surfaces of the end flanges include crushable ribs that secure the core with respect to the bobbin. The passageway and inner core may have an oval-shaped profile. The passageway and inner core may have a circular profile.
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公开(公告)号：US09719662B1
公开(公告)日：2017-08-01
申请号：US14878436
申请日：2015-10-08
CPC分类号： F21V13/04 , F21S4/28 , F21S8/00 , F21S8/026 , F21S8/04 , F21V5/045 , F21V7/0033 , F21V7/005 , F21V7/0066 , F21V7/0091 , F21V13/12 , F21V15/015 , F21Y2101/00 , F21Y2103/003 , F21Y2103/10 , F21Y2115/10 , G02B17/006
摘要： A lighting apparatus includes a light source located on a centerline, a light redirecting lens positioned to receive light from the light source, and an outer reflector that receives light redirected by the redirecting lens. The redirecting lens includes an inner reflecting portion that includes a total internal reflection (TIR) surface that reflects light outward to an outer refracting portion. The outer refracting portion of the redirecting lens refracts the light outward and away from the position of the light source. The outer reflector receives the refracted light and reflects the inward toward the centerline and farther away from the light source. The lighting apparatus further includes a diffuser that diffuses the light from the outer reflector. The lighting apparatus may be configured longitudinally or may be configured to be rotationally symmetrical with respect to the centerline.
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公开(公告)号：US09693404B1
公开(公告)日：2017-06-27
申请号：US15266211
申请日：2016-09-15
发明人： Wei Xiong , Mark Arias , John Helms , Haiqing Yang
CPC分类号： H05B33/0815 , H02M3/33507 , H02M2001/0009 , Y02B20/341
摘要： A multi-channel LED driver is provided with a negative current sensing method for inherent output short circuit protection, as well as protection from output misconnection. A plurality of power converters are configured to drive respective LED arrays, each power converter respectively comprising a first stage configured to provide current through a primary winding of an isolation transformer. A second stage has a capacitor coupled in parallel with a secondary winding of the isolation transformer, a current sensing resistor coupled between the secondary winding and a circuit ground for the second stage. A filtering circuit is coupled on a first end to a node between the secondary winding and the current sensing resistor, and on a second end to the circuit ground. A feedback circuit is coupled between the first stage and the filtering circuit, and configured to deliver a control signal corresponding to current through the secondary winding.
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公开(公告)号：US09681520B1
公开(公告)日：2017-06-13
申请号：US15233365
申请日：2016-08-10
发明人： Travis L. Berry , John Cavacuiti , Rob Mahaffey
CPC分类号： H05B37/0218 , F21V23/006 , F21V23/0464 , F21Y2115/10 , G01J1/0425 , G02B6/0096 , H05B33/0815 , H05B33/0854 , H05B37/0272
摘要： A lighting control system for a light fixture has an ambient light sensor mounted therein. A switching circuit provides power for driving lighting sources. A controller receives signals from the light sensor and regulates switching frequencies based on desired lighting output level and the ambient light condition. An ambient lighting channel extends from the ambient light sensor to an aperture between outer and inner surfaces of the housing. The ambient lighting channel may include a fiber optic light pipe which extends from the aperture to surround the light sensor. The fiber optic light pipe may extend through the aperture from the ambient light sensor to an ambient light source external to the light fixture. The light sensor may mount on a shared PCB with respect to the lighting sources, such as an LED array, and transmit ambient lighting information to the controller via a feedback loop.
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59.发明授权公开(公告)号：US09645597B1
公开(公告)日：2017-05-09
申请号：US14096406
申请日：2013-12-04
发明人： Wei Xiong , Candice Ungacta
CPC分类号： G05F1/70
摘要： A floating output power supply includes circuitry for indirectly sensing an output current and output voltage of the floating output power supply. The circuitry includes a circuit ground referenced current sensing resistor placed in between diodes forming one leg of a full wave rectifier. The voltage of this current sensing resistor is circuit ground referenced and representative of an output current of the floating output power supply. A resistive network is coupled between a negative output and a positive output of the floating output power supply. The resistive network includes a circuit ground referenced resistor whose voltage is representative of the output voltage of the floating output power supply. A controller of the floating output power supply determines output voltage, current, and/or power from these sensed voltages and currents and adjusts an operating parameter of an input power supply as a function of the determined output voltage, current, and/or power.
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60.发明授权Gate drive integrated circuit with input line overvoltage protection for a half-bridge power converter 有权栅极驱动集成电路，具有半桥电源转换器的输入线过电压保护公开(公告)号：US09520711B1
公开(公告)日：2016-12-13
申请号：US14490946
申请日：2014-09-19
发明人： Wei Xiong
CPC分类号： H02H7/122 , H02H3/20 , H02M7/538 , H05B33/0815 , H05B33/0887 , H05B37/0227 , H05B41/2828 , H05B41/2853
摘要： A driver circuit provides power from a power source to a load. The driver circuit includes a surge protector, an input stage (e.g., full wave rectifier), a controller and an output stage (e.g., a half bridge inverter). The input stage receives power from the power source and provides a direct current (DC) power rail. The controller operates the output stage to provide power from the DC power rail to the load. The controller includes an overvoltage sensing module that shuts down the output stage when the DC power rail exceeds a predetermined voltage. Ceasing operation of the output stage protects the output stage from damage while the DC power rail is above the predetermined voltage.
摘要翻译： 驱动电路从电源向负载供电。 驱动器电路包括浪涌保护器，输入级（例如全波整流器），控制器和输出级（例如，半桥逆变器）。 输入级从电源接收电力并提供直流（DC）电力轨。 控制器操作输出级，以提供从直流电源轨到负载的电力。 该控制器包括过电压感测模块，其在直流电源轨超过预定电压时关闭输出级。 输出级的停止运行在直流电源轨高于预定电压时保护输出级免受损坏。
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