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公开(公告)号：US5808879A
公开(公告)日：1998-09-15
申请号：US773117
申请日：1996-12-26
申请人： Rui Liu , Wen-Jian Gu
发明人： Rui Liu , Wen-Jian Gu
摘要： A DC-DC ZVS PWM converter circuit which utilizes the leakage inductance of an output transformer and a three-step operation cycle so as to reduce the voltage stress on the converter power switching transistors and to reduce the EMI noise emissions of the circuit.
摘要翻译： DC-DC ZVS PWM转换器电路，利用输出变压器的漏电感和三步操作周期，以降低转换器功率开关晶体管的电压应力，并减少电路的EMI噪声发射。
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公开(公告)号：US5598326A
公开(公告)日：1997-01-28
申请号：US591042
申请日：1996-01-25
申请人： Rui Liu , Wen-Jian Gu
发明人： Rui Liu , Wen-Jian Gu
CPC分类号： H02M1/4241 , H02M5/458 , H05B41/28 , Y02B70/126
摘要： A high frequency AC/AC converter apparatus with power factor correction includes an AC/DC converter circuit part to provide power factor correction and a DC/AC inverter circuit part to produce a high frequency AC signal for operation of a load, for example, a discharge lamp. The AC/DC converter circuit part includes a diode and an inductor. The converter apparatus utilizes first and second semiconductor controlled switching devices, one of which is common to each part of the overall converter apparatus. A single control circuit controls both parts of the converter apparatus by controlling the switching of the first and second semiconductor switching devices. There are two possible control techniques, constant duty ratio control or duty ratio sweeping control. A voltage clamp circuit inhibits undesired oscillation of the diode voltage.
摘要翻译： 具有功率因数校正的高频AC / AC转换器装置包括用于提供功率因数校正的AC / DC转换器电路部分和DC / AC逆变器电路部分，以产生用于操作负载的高频AC信号，例如， 放电灯 AC / DC转换器电路部分包括二极管和电感器。 转换器装置利用第一和第二半导体控制的开关装置，其中之一是整个转换器装置的每个部分是共同的。 单个控制电路通过控制第一和第二半导体开关器件的切换来控制转换器装置的两个部分。 有两种可能的控制技术，恒功率比控制或占空比扫描控制。 电压钳位电路抑制二极管电压的不期望的振荡。
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公开(公告)号：US5371440A
公开(公告)日：1994-12-06
申请号：US174076
申请日：1993-12-28
申请人： Rui Liu , Wen-Jian Gu
发明人： Rui Liu , Wen-Jian Gu
IPC分类号： H05B41/24 , H05B41/282 , H05B37/02
CPC分类号： H05B41/24 , H05B41/282 , H05B41/2828 , Y02B20/183 , Y10S315/05
摘要： A miniature electronic ballast with low radio frequency interference (RFI) for operating a discharge lamp by amplitude modulation and two frequency operation. A high frequency operating voltage (approximately 1-2 MHz) is generated and is amplitude modulated at a relatively lower frequency (approximately 20-50 KHz). This operating voltage is demodulated to suppress the high frequency carrier voltage (1-2 MHz) and the low frequency modulating signal (20-50 KHz) itself is applied to the discharge lamp to energize same. The use of the high frequency operating voltage makes it possible to reduce the size of the magnetic components in the electronic ballast, whereas the low frequency voltage actually applied to the discharge lamp avoids problems of RFI that otherwise would occur if the high frequency carrier voltage itself was applied to the discharge lamp.
摘要翻译： 一种具有低射频干扰（RFI）的微型电子镇流器，用于通过幅度调制和两次频率操作来操作放电灯。 产生高频工作电压（大约1-2MHz），并以相对较低的频率（大约20-50KHz）进行幅度调制。 该工作电压被解调以抑制高频载波电压（1-2MHz），并且低频调制信号（20-50KHz）本身被施加到放电灯以对其通电。 使用高频工作电压使得可以减小电子镇流器中的磁性部件的尺寸，而实际施加到放电灯的低频电压避免了RFI的问题，否则如果高频载波电压本身 被施加到放电灯。
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4.发明授权
公开(公告)号：US5907223A
公开(公告)日：1999-05-25
申请号：US891879
申请日：1997-07-09
申请人： Wen-Jian Gu , Rui Liu
发明人： Wen-Jian Gu , Rui Liu
CPC分类号： H02M1/44 , H02M1/4208 , H02M5/225 , H05B41/28 , Y02B70/126
摘要： An AC-AC ballast system for a discharge lamp (e.g., a fluorescent lamp), which includes a PFC converter which incorporates an isolation transformer, and a DC-AC inverter provided on the secondary side of the isolation transformer. Because the AC line input is isolated from the lamp load by the transformer in the PFC converter, the switching frequency of the PFC converter can be advantageously significantly higher than the lamp current frequency (and the switching frequency of the DC-AC inverter), to thereby enable a significant reduction in the size and weight of the ballast system, without an increase in the emission of EMI radiation from the lamp. In this regard, the ballast system of the present invention can be thought of as a two-frequency ballast system having an isolated PFC converter.
摘要翻译： 一种用于放电灯（例如，荧光灯）的AC-AC镇流器系统，其包括具有隔离变压器的PFC转换器和设置在隔离变压器的次级侧上的DC-AC逆变器。 由于交流线路输入与PFC转换器中的变压器与灯负载隔离，所以PFC转换器的开关频率可以有利地显着高于灯电流频率（以及直流 - 交流逆变器的开关频率）至 从而能够显着降低镇流器系统的尺寸和重量，而不增加来自灯的EMI辐射的发射。 在这方面，本发明的镇流器系统可以被认为是具有隔离PFC转换器的双频镇流器系统。
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公开(公告)号：US5510974A
公开(公告)日：1996-04-23
申请号：US174532
申请日：1993-12-28
申请人： Wen-Jian Gu , Rui Liu
发明人： Wen-Jian Gu , Rui Liu
CPC分类号： H02M1/4258 , H02M3/3374 , Y02B70/126 , Y02B70/1433
摘要： A single stage high frequency push-pull converter with input power factor correction. The boost converter for input power factor correction and the high-frequency push-pull DC/AC inverter are combined into a single stage converter thereby reducing the number of circuit components while at the same time reducing the voltage stress on the high frequency switching transistors of the converter.
摘要翻译： 具有输入功率因数校正的单级高频推挽转换器。 用于输入功率因数校正的升压转换器和高频推挽DC / AC逆变器组合成单级转换器，从而减少电路组件的数量，同时降低高频开关晶体管的电压应力 转换器。
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公开(公告)号：US5627717A
公开(公告)日：1997-05-06
申请号：US366149
申请日：1994-12-28
CPC分类号： H02H3/0935
摘要： Digital processing of current signals allows close matching of arbitrary time delay curves for a circuit breaker. An analog signal proportional to the current is sampled and digitized. Digital samples, with or without further processing, are used to select increment values from a look-up table for accumulation in a counter. The counter is decremented periodically to simulate cooling of the circuit being protected. The values in the look-up table are determined according to the desired time delay curve. Processing of the digital samples may include squaring samples, accumulating the squared values to form a subtotal which is compared with an instantaneous trip threshold, accumulating the subtotals for a time period equal to half a cycle of AC line voltage, taking the square root of the accumulated subtotals, and using that square root as the address for looking up the increment value.
摘要翻译： 电流信号的数字处理允许断路器的任意时间延迟曲线的紧密匹配。 与电流成比例的模拟信号被采样和数字化。 使用或不进行进一步处理的数字样本用于从查找表中选择增量值以累积在计数器中。 计数器周期性地递减，以模拟被保护电路的冷却。 查找表中的值根据所需的时间延迟曲线确定。 数字样本的处理可以包括平方样本，累积平方值以形成小计，其与瞬时跳闸阈值进行比较，将小计累加等于AC线电压的一半周期的时间段，取平均根 累积小计，并使用该平方根作为查找增量值的地址。
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公开(公告)号：US06011360A
公开(公告)日：2000-01-04
申请号：US932986
申请日：1997-09-18
申请人： Pawel M. Gradzki , Wen-Jian Gu , Ihor T. Wacyk
发明人： Pawel M. Gradzki , Wen-Jian Gu , Ihor T. Wacyk
IPC分类号： H05B41/285 , H05B41/392 , H05B37/00
CPC分类号： H05B41/3927 , H05B41/2856 , H05B41/3921
摘要： A ballast including an inverter and a circuit having a resonant frequency coupled to the output of the inverter. In one embodiment of the invention, the only discrete type of element substantially affecting the resonant frequency is substantially inductive in electrical character. In this embodiment of the invention, there is also no discrete ballasting element in series with the lamp load. The reduction in discrete elements reduces both power consumption and costs associated with the ballast.
摘要翻译： 一种镇流器，包括逆变器和具有耦合到逆变器的输出的谐振频率的电路。 在本发明的一个实施例中，基本上影响谐振频率的唯一离散类型的元件在电特性中基本上是感应的。 在本发明的该实施例中，还没有与灯负载串联的离散镇流元件。 离散元件的减少降低了与镇流器相关的功耗和成本。
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8.发明授权
公开(公告)号：US5811965A
公开(公告)日：1998-09-22
申请号：US366150
申请日：1994-12-28
申请人： Wen-Jian Gu
发明人： Wen-Jian Gu
CPC分类号： G01R15/18
摘要： Current is sensed by a circuit which provides a high frequency reversing voltage to a sensing winding on a current transformer, for driving the transformer into its linear region at least once per high frequency cycle. Current through the sensing winding is sampled while the transformer is in that linear region. Preferably, the current is sampled approximately at the instants of reversal of the voltage being applied to the sensing winding, and the sample having the lower absolute value is selected as a sample proportional to the line current.
摘要翻译： 通过电路感测电流，该电路向电流互感器上的感测绕组提供高频反向电压，用于每个高频周期将变压器驱动至其线性区域至少一次。 当变压器处于该线性区域时，通过感测绕组的电流被采样。 优选地，在施加到感测绕组的电压的反转时刻大致对电流进行采样，并且选择具有较低绝对值的样本作为与线电流成比例的采样。
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公开(公告)号：US5552979A
公开(公告)日：1996-09-03
申请号：US159394
申请日：1993-11-30
CPC分类号： H02M1/40 , G01R15/183 , G01R19/0092 , H02M3/3376 , H02M7/53803 , H02M2001/0009
摘要： Current in a line is measured by passing it through a coil, having at least one turn, linking a small high permeability core; passing a measuring current through a bucking winding around the same core; and controlling the measuring current to buck the magnetomotive force of the line current so that the core flux stays below the saturation level. The measuring current may flow through a precision resistor so that a voltage across the resistor is an accurate measure of the line current. The measuring current is obtained from a high frequency switching circuit which senses the change of flux in the core. In normal operation the circuit switches when the core flux has risen to a predetermined value, such as 60% or 80% of the saturation value. If drift or extreme transients cause the flux to reach the saturation level, a sensing and correction circuit re-establishes operation between the desired points.
摘要翻译： 通过使线圈通过具有至少一匝的线圈来连接小的高磁导率芯来测量线中的电流; 使测量电流通过围绕相同芯的绕组绕组; 并且控制测量电流以降低线电流的磁动势，使得磁心通量保持在饱和水平以下。 测量电流可能会流过精密电阻，使得电阻两端的电压可以精确测量线路电流。 测量电流是从高频切换电路获得的，该电路检测芯中磁通的变化。 在正常操作中，当磁通量上升到预定值（例如饱和值的60％或80％）时，电路切换。 如果漂移或极端瞬变导致通量达到饱和水平，则感测和校正电路将重新建立所需点之间的操作。
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