Abstract:
A fluorescent lamp (2), in particular a backlight lamp of a display device, is supplied with an alternating voltage, a frequency and an amplitude of which being greater during ignition than during normal operation of the lamp. The voltage (V) across the lamp and the current (I) through the lamp are measured to provide a measured voltage value and a measured real lamp current value. From the alternating voltage there is derived a voltage (V2). The measured voltage value is multiplied by the sum of the measured real lamp current value and the derived voltage. The multiplication result (P=V*(I+V2)) is compared with a reference value (Ref), which results in a difference or error value. The error value is used to control the frequency and the amplitude of the alternating voltage (V), such that the error value is minimized.
Abstract translation:荧光灯(2),特别是显示装置的背光灯被提供有在点火期间比在灯的正常操作期间更大的交流电压,频率和振幅。 测量灯上的电压(V)和通过灯的电流(I),以提供测量的电压值和测得的实际灯电流值。 从交流电压导出电压(V 2)。 测得的电压值乘以测得的实际灯电流值与导出电压之和。 将乘法结果(P = V *(I + V 2))与参考值(Ref)进行比较,这导致差值或误差值。 误差值用于控制交流电压(V)的频率和幅度,使得误差值最小化。
Abstract:
A system (100A, 100B, 200, 300) for operating three gas discharge lamps (1A, 1B, 1C) using a common power source comprises three branches (110, 120, 130) connected in parallel between a first input node (A) and a second input node (102), wherein each branch comprises a lamp. The system comprises current equalizing means for ensuring that the currents in all branches are mutually substantially equal. The current equalizing means comprise two equalizing transformers (151, 152), wherein an equalizing transformer (151; 152) has one winding (114; 125) connected in series with one lamp (1A; 1B) and has another winding (124; 135) connected in series with another lamp (1B; 1C).
Abstract:
End of life of a lamp operated by a ballast circuit is detected by detecting whether the amplitude of a DC current through the lamp is outside of a range between two predetermined boundary values.
Abstract:
The present invention deals with wireless control of a lamp such as a fluorescent lamp controlled by a ballast with a wireless control interface for RF communication. The receiver input and the transmitter output of the control interface module are connected to one or more mains wires by means of (a) coupling capacitor(s) or a Lecher line transformer. During operation the one or more mains wires serve as the lamp antenna.
Abstract:
A method for bonding a lighting device to a first lighting system, in which the first system comprises a master controller, which is remote from the lighting device and which may control a slave controller of the lighting device if the slave controller has stored therein an identification (ID) of the system. Upon powering up, if the slave controller contains such an ID, it tries to communicate with a master controller of the system. If the slave controller does not succeed in establishing such a communication it enters a state in which it can change it settings, in particular clearing said ID, upon receiving, during a time window with reduced communication security level, a message for allowing such changing of its settings.
Abstract:
In a solar power systetm a ground fault detection system with switched reference levels is used. As a consequence the leakage resistance of the euipment can always be determined.
Abstract:
In a digital interface comprising a current limiter, a reference voltage proportional to the bus voltage is generated and the current limiter is switched on when the incoming digital signal is higher than the reference voltage and switched of when the incoming signal is smaller than the reference voltage. The “high/low-ratio” of the digital signal at the output of the interface is substantially improved by the use of the reference voltage.
Abstract:
An up-converter (100) comprises: an inductor (5) and a diode (6) connected in series with an output (3); a capacitor (8) connected in parallel to said output; a controllable switch (7) having one switch terminal coupled to a node between the inductor and the diode. A control method comprises the steps of feeding the inductor with a rectified AC voltage (Vi); and generating a switch control signal (SC) having a pulse width (TH), for switching the switch open and closed; wherein the switch control signal is generated on the basis of the output voltage (Vo) at said output (3). According to the invention, the up-converter comprises a digital processor (110) which samples the output voltage (Vo), and digitally processes the sampled output voltage (Vo) to calculate the pulse width (TH) of the switch control signal (SC) such that the output voltage (Vo) remains substantially constant.
Abstract translation:上变频器(100)包括:与输出(3)串联连接的电感器(5)和二极管(6); 与所述输出并联连接的电容器(8); 可控开关(7),其具有耦合到电感器和二极管之间的节点的一个开关端子。 一种控制方法包括以下步骤:给整流的AC电压(V SUB)馈送电感器; 以及产生具有脉冲宽度(T H H H)的开关控制信号(S SUB),用于开关断开; 其中所述开关控制信号是基于所述输出端(3)处的输出电压(Vo)产生的。 根据本发明,上变频器包括对输出电压(Vo)进行采样的数字处理器(110),并对采样的输出电压(V SUB)进行数字处理以计算脉冲宽度(TH ),使得输出电压(V SUB)保持大致恒定的开关控制信号(S SUB)。
Abstract:
A method for bonding a lighting device to a first lighting system, in which the first system comprises a master controller, which is remote from the lighting device and which may control a slave controller of the lighting device if the slave controller has stored therein an identification (ID) of the system. Upon powering up, if the slave controller contains such an ID, it tries to communicate with a master controller of the system. If the slave controller does not succeed in establishing such a communication it enters a state in which it can change it settings, in particular clearing said ID, upon receiving, during a time window with reduced communication security level, a message for allowing such changing of its settings.
Abstract:
A method for measuring a color temperature (TC) of a light source (2) comprises the steps of: measuring the partial intensity of one predefined blue spectral conpponent (B); measuring the luminance (V); and calculating the quotient BN as representing the color temperature (TC). The color temperature (TC) is calculated on the basis of a predetermined relationship between the color temperature (TC) and the quotient BN. Sensor assembly capable of generating a measuring signal containing information regarding the color temperature of a light source. Switch stage for cooperation with a sensor assembly. Driver for during a lamp with variable color temperature properties. Lamp system comprising a lamp, a sensor assembly and a lamp driver.