LED retrofit driver circuit and method of operating the same

    公开(公告)号:US10299331B2

    公开(公告)日:2019-05-21

    申请号:US14117047

    申请日:2012-05-14

    IPC分类号: H05B33/08 F21K9/23 H05B39/04

    摘要: A LED retrofit driver circuit (3) is provided, comprising at least an input (6) for receiving an operating voltage from a power supply (2), an output (8) for connection to one or more LED units (5), a power converter (7) connected with said input (6) and said output (8) and configured to provide a lamp current (50) at said output (8) during operation in at least a first and a second operating state. To provide a versatile circuit (3), allowing operation with a variety of power supplies and under various load conditions, in said first operating state, the power converter (7) is adapted to switch between a high current generating mode (40), in which the power converter (7) is configured to draw current pulses from said power supply (2) to provide a first average input current (33a), and an OFF mode (42) in which no current is drawn from said power supply (2). In said second operating state, said power converter (7) is adapted at least to operate in a low current generating mode (41), in which the power converter (7) is configured to draw a current from said power supply (2) to provide a second average input current (33b) which is lower than said first average input current (33a).

    Radio Station and Method of Operating a Radio Station
    7.
    发明申请
    Radio Station and Method of Operating a Radio Station 审中-公开
    无线电台和操作无线电台的方法

    公开(公告)号:US20080309250A1

    公开(公告)日:2008-12-18

    申请号:US12097572

    申请日:2006-12-08

    IPC分类号: H05B41/36 H05B41/24

    CPC分类号: H05B41/2827 H02M2001/0006

    摘要: A lamp driver circuit supplies an alternating current having an operating frequency to a lamp, e.g. a fluorescent lamp, for operating the lamp. To switch off the lamp, the frequency of the alternating current is changed to a non-operating frequency. Due to the frequency change, the impedance of an impedance element of the lamp driver circuit is changed. As a result, the lamp current decreases to zero and the lamp extinguishes. According to the invention, the current having the non-operating frequency is employed to generate a voltage to be supplied to a further circuit, such as a control circuit. Thus, the lamp driver circuit and an associated control circuit may operate in an operating mode or in a standby, i.e. non-operating, mode without requiring a separate voltage supply source. In the standby mode, the control circuit may be controlled to switch the lamp driver circuit from the non-operating mode into the operating mode, thereby switching the lamp on.

    摘要翻译: 灯驱动器电路向灯提供具有工作频率的交流电,例如, 荧光灯,用于操作灯。 要关闭灯泡,交流电频率变为非工作频率。 由于频率变化,灯驱动电路的阻抗元件的阻抗发生变化。 结果,灯电流降低到零,灯熄灭。 根据本发明,采用具有非工作频率的电流来产生要提供给诸如控制电路之类的其它电路的电压。 因此,灯驱动器电路和相关联的控制电路可以在操作模式或待机(即非操作)模式下操作,而不需要单独的电压源。 在待机模式下,可以控制控制电路以将灯驱动电路从非操作模式切换到操作模式,从而将灯接通。