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    • 5. 发明授权
    • Lamp driver circuit
    • 灯驱动电路
    • US4987347A
    • 1991-01-22
    • US320726
    • 1989-03-08
    • Robert A. LeskovecJohn M. DavenportJoseph M. Allison
    • Robert A. LeskovecJohn M. DavenportJoseph M. Allison
    • H05B39/04H05B41/292
    • H05B41/2928H05B39/045Y10S315/02Y10S315/07
    • A lamp driver circuit is presented herein for driving a lamp circuit with an AC squarewave voltage at a relatively high frequency. The driver circuit includes a self-oscillating half-bridge circuit having a pair of input terminals connected across a DC voltage supply, which may be obtained from rectifying an AC voltage signal, and a pair of output terminals connected across a lamp circuit including a lamp, either a resistive lamp or a gaseous discharge lamp, to be energized. The circuit also includes a pair of capacitors connected together in series across the input terminals and having a junction therebetween connected to a first one of the output terminals. The bridge circuit also includes first and second switching transistors connected together in series across the input terminals. A transformer is provided having first and second windings thereon respectively connected to the first and second switching transistors for alternately applying forward biasing base drive current to the first and second transistors. A third winding on the transformer is connected in series from the junction of the two transistors to a second one of the output terminals for purposes of supplying a squarewave voltage across the output terminals for driving the lamp circuit. A starter circuit serves to start the half-bridge circuit by initially turning on one of the switching transistors in such a manner that while one transistor is being forward biased into conduction, the other transistor is reverse biased.
    • 本文提出了一种灯驱动器电路,用于以较高频率驱动具有交流方波电压的灯电路。 驱动器电路包括自振荡半桥电路,其具有连接在直流电压源上的一对输入端子,该一对输入端子可以从整流交流电压信号获得;以及一对输出端子,其连接在包括灯 ,电阻灯或气体放电灯,被激励。 该电路还包括串联连接在输入端上的一对电容器,并且具有连接到第一输出端子的连接点。 桥接电路还包括串联连接在输入端子上的第一和第二开关晶体管。 提供一种变压器,其具有分别连接到第一和第二开关晶体管的第一和第二绕组,用于交替地向第一和第二晶体管施加正向偏置基极驱动电流。 变压器上的第三绕组从两个晶体管的结点串联连接到输出端的第二绕组,用于在输出端上提供方波电压以驱动灯电路。 起动器电路用于通过首先以一个晶体管正向偏置为导通的方式首先接通其中一个开关晶体管来启动半桥电路,另一个晶体管被反向偏置。
    • 8. 发明授权
    • Fluorescent lamp ballast with integrated circuit
    • 带集成电路的荧光灯镇流器
    • US06366032B1
    • 2002-04-02
    • US09494193
    • 2000-01-28
    • Joseph M. AllisonDavid J. Moore
    • Joseph M. AllisonDavid J. Moore
    • G05F100
    • H05B41/2985
    • A resonant fluorescent lamp ballast includes an IC driver for a half-bridge arrangement that supplies AC current to a lamp. The IC creates a frequency sweep from a pre-heat frequency, through a resonant frequency, to a still lower operating frequency. A pre-heat pin in the IC triggers a re-start or the frequency sweep when a first signal exceeds a first threshold level. A shut-down pin in the IC associated with an internal shut-down latch shuts down the driver when a second signal exceeds a second threshold level. Pre-heat trigger circuitry detects a current spike through half-bridge switches when the lamp has not yet started, supplying the pre-heat pin with a first signal exceeding the first threshold level. End-of-life circuitry provides to the shut-down pin a second signal exceeding the second threshold level if lamp current fails to reach a substantial portion of its normal level within a predetermined time. A DC current-supply path is provided from a DC current supply, through at least one filament of each lamp in the load circuit, to a power-supply pin for the IC. The end-of-life circuitry cooperates with the pre-heat trigger circuitry by limiting the number of the frequency sweeps to no more than occur during the predetermined time set by the end-of-life circuitry. The DC path cooperates with the end-of-life circuitry and the internal shut-down latch to reset the latch when the DC path is broken due to absence of the at least one filament in the path.
    • 共振荧光灯镇流器包括用于向灯提供AC电流的用于半桥布置的IC驱动器。 IC从预热频率通过谐振频率创建频率扫描到更低的工作频率。 当第一信号超过第一阈值电平时,IC中的预热引脚触发重新启动或频率扫描。 与内部关闭闩锁相关联的IC中的关闭引脚在第二信号超过第二阈值电平时关闭驱动器。 预热触发电路在灯尚未启动时通过半桥开关检测电流尖峰,为预热引脚提供超过第一阈值电平的第一信号。 如果灯电流在预定时间内未能达到其正常水平的相当大的一部分,则寿命终止电路向停车销提供超过第二阈值水平的第二信号。 直流电流供给路径通过负载电路中的每个灯的至少一根灯丝从直流电源提供给用于IC的电源引脚。 寿命终止电路通过将频率扫描的数量限制在由寿命终止电路设置的预定时间内不再发生的情况下与预热触发电路配合。 DC路径与寿命终止电路和内部关闭锁存器配合,以在由于路径中不存在至少一个细丝而导致DC路径故障时复位锁存器。
    • 9. 发明授权
    • Gas discharge lamp ballast circuit with reduced parts-count starting
circuit
    • 气体放电灯镇流器电路具有减少的零件数启动电路
    • US5426346A
    • 1995-06-20
    • US209092
    • 1994-03-09
    • Joseph M. Allison
    • Joseph M. Allison
    • H05B41/18H05B41/04H05B41/288H05B41/38H05B37/02
    • H05B41/2881H05B41/042H05B41/288H05B41/2882H05B41/2885H05B41/384Y02B20/202Y02B20/204Y02B20/206
    • Disclosed is an electronic ballast circuit for a high pressure gas discharge lamp with a reduced parts-count starting circuit. The circuit comprises an arrangement for supplying d.c. voltage from a d.c. source, and a main inductor for receiving energy from the d.c. source and supplying the energy to the lamp. The main inductor has a plurality of windings. A first winding of the inductor is coupled to receive energy from the d.c. source. Further included is a current-switching arrangement conductive during periodic first part cycles for transferring energy from the d.c. source to the main inductor, and non-conductive during periodic second part cycles. A first part cycle is followed by a second part cycle in successive periods of switching operation of the current-switching arrangement. The first winding of the main inductor has impressed across it substantially the d.c. source voltage during the first part cycles, and reflects substantially the lamp voltage during the second part cycles. The circuit further includes a starting circuit for providing a pulse in excess of 15,000 volts across the lamp to facilitate starting the lamp. The starting circuit comprises a spark gap device, a pulse transformer, and a voltage-generating circuit. The voltage-generating circuit comprises a starting capacitor for storing energy and impressing across a spark gap an increasing voltage, which reaches the breakdown voltage of the spark gap during a lamp start-up period, and also a circuit for charging the starting capacitor with energy from the main inductor during the second part cycles.
    • 公开了一种具有减少零件计数启动电路的高压气体放电灯的电子镇流器电路。 该电路包括用于提供直流电的装置。 电压从直流 源和用于从直流接收能量的主电感器。 来源并向灯提供能量。 主电感器具有多个绕组。 电感器的第一绕组被耦合以从直流接收能量。 资源。 还包括电流切换装置,在周期性的第一部分循环期间传导来自直流的能量。 源极到主电感器,并且在周期性第二部分周期期间是非导通的。 第一部分周期之后是电流切换装置的开关操作的连续周期中的第二部分周期。 主电感器的第一个绕组基本上印加了直流电压。 源极电压,并且在第二部分周期期间基本上反映灯电压。 该电路还包括用于在灯上提供超过15000伏的脉冲以启动灯的启动电路。 启动电路包括火花隙装置,脉冲变压器和电压发生电路。 电压发生电路包括一个启动电容器,用于存储能量并在火花间隙上施加一个增加的电压,该电压在灯启动期间达到火花隙的击穿电压,并且还包括用于向启动电容器充电的电路 在第二部分循环期间从主电感器。
    • 10. 发明授权
    • Flash strobe power supply system and method
    • 闪光灯电源系统及方法
    • US06819059B2
    • 2004-11-16
    • US10282943
    • 2002-10-29
    • Tilton L. BlockJoseph M. Allison
    • Tilton L. BlockJoseph M. Allison
    • H05B3700
    • H05B41/34
    • A reliable strobe power supply is disclosed that provides requisite light energy for emergency uses without causing EMI problems. A two phase dual flyback power converter operating in transitional mode is disclosed containing a microcontroller that maintains a 180 degree displacement between the two phases by enabling a small, variable dead time between the cessation of stored energy in the flyback transformers and turn-on of the associated power switching transistor for one or the other phases. The power supply is capable of detecting a fault (neoning) and automatically correcting the condition by incrementing the flash capacitor charge off-time delay. The power supply is also capable of tolerating defective (persistently neoning) strobe tubes that cause an inordinate delay in capacitor charging by turning them off.
    • 公开了一种可靠的闪光灯电源,为紧急用途提供必要的光能,而不会引起EMI问题。 公开了一种以过渡模式工作的双相双反激​​式功率转换器,其包含微控制器,该微控制器通过在反激式变压器中停止存储的能量之间的小的,可变的死区时间以及 相关的功率开关晶体管用于一个或多个相。 电源能够检测故障(neoning),并通过增加闪存电容器充电关闭时间延迟来自动校正状况。 电源还能够容忍通过关闭电容器充电导致电源充电过度延迟的有缺陷(持续地新的)闪光灯管。