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1. 发明申请

US20120262070A1 LIGHT EMITTING ELEMENT DRIVE DEVICE 有权
标题翻译：发光元件驱动装置
公开(公告)号：US20120262070A1
公开(公告)日：2012-10-18
申请号：US13445546
申请日：2012-04-12
申请人： Kazunori OSHIMA , Hironobu MASUOKA
发明人： Kazunori OSHIMA , Hironobu MASUOKA
IPC分类号： H05B37/02
CPC分类号： H05B33/0887 , Y02B20/341
摘要： A light emitting element drive device includes a light emitting unit that includes a light emitting element and that performs dimming based on a pulse width modulation (PWM) signal, a first switching element that is turned ON or OFF based on the PWM signal and that is connected in series to the light emitting unit, and a protection circuit that includes a charging circuit and a second switching element. The second switching element is turned ON when a first voltage obtained by a charging operation of the charging circuit is equal to or more than a first predetermined value. The charging circuit discharges electric charge through the first switching element when a second voltage between input and output terminals of the first switching element drops. The first switching element is turned OFF despite the existence of the PWM signal when the second switching element is turned ON.
摘要翻译：发光元件驱动装置包括：发光单元，其包括发光元件，并且基于脉宽调制（PWM）信号进行调光;基于PWM信号接通或断开的第一开关元件，即，串联连接到发光单元，以及保护电路，其包括充电电路和第二开关元件。当通过充电电路的充电操作获得的第一电压等于或大于第一预定值时，第二开关元件接通。当第一开关元件的输入和输出端之间的第二电压下降时，充电电路通过第一开关元件放电电荷。当第二开关元件接通时，第一开关元件关闭，尽管存在PWM信号。

2. 发明申请

US20110309767A1 LIGHT-EMITTING ELEMENT DRIVE DEVICE 审中-公开
标题翻译：发光元件驱动装置
公开(公告)号：US20110309767A1
公开(公告)日：2011-12-22
申请号：US13162086
申请日：2011-06-16
申请人： Kazunori OSHIMA
发明人： Kazunori OSHIMA
IPC分类号： H05B37/02
CPC分类号： H05B33/0845
摘要： A light-emitting element drive device capable of expanding a dimming range of a light-emitting element, enabling a constant minimum dimmed luminance to be obtained irrespective of individual differences between devices. A burst signal generating circuit 12 generates a burst signal Vburst which is a PWM dimming signal generated based on a dimming analogue voltage Vbr indicating a dimming level. This circuit 12 includes an oscillating circuit 24 for generating a triangle wave signal Tri ref, a differentiating circuit 28 for detecting a peak of the triangle wave signal Tri ref, the one-shot timer 30 for generating a signal S2 having pulse width of the duration τ (tau), starting point of which is a peak of the triangle wave signal Tri ref, corresponding to the minimum dimmed luminance of the LED 10, and a NAND circuit 32 for generating the burst signal Vburst based on the comparative result between the voltage level at the triangle wave signal Tri ref and the analogue voltage Vbr when the analogue voltage Vbr does not exceed a predetermined voltage or the burst signal Vburst having pulse width of the duration τ (tau) based on the signal S2 when the analogue voltage Vbr exceeds a predetermined voltage.
摘要翻译：一种能够扩大发光元件的调光范围的发光元件驱动装置，能够获得恒定的最小调光亮度，而与设备之间的个体差异无关。突发信号发生电路12产生突发信号Vburst，其是基于指示调光电平的调光模拟电压Vbr产生的PWM调光信号。该电路12包括用于产生三角波信号Tri ref的振荡电路24，用于检测三角波信号Tri ref的峰值的微分电路28，用于产生具有持续时间脉冲宽度的信号S2的单触发定时器30 τ（τ），其起点是对应于LED 10的最小调光亮度的三角波信号Tri ref的峰值，以及用于产生突发信号Vburst的NAND电路32，其基于电压当模拟电压Vbr不超过预定电压时，三角波信号Tri ref和模拟电压Vbr的电平或者当模拟电压Vbr超过时基于信号S2的脉冲宽度为τ（τ）的脉冲宽度的脉冲串信号Vburst 预定电压。

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