JP2006134844A - Discharge lamp lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of automatically securing the minimum brightness, by switching off a discharge lamp 3 to secure safety and by forcibly switching on a juxtaposed auxiliary lamp 5 in an abnormal state, such as at the end of the lifetime of the discharge lamp 3 which is the main illumination. <P>SOLUTION: A commercial power supply 1 is provided. A discharge lamp 3 is provided. An auxiliary lamp 5, of which the light output is smaller than that of the discharge lamp 3, is provided. A main lighting circuit 4, which is energized by the commercial power supply 1 and which lights on the discharge lamp 3, is provided. A lifetime detecting circuit 42 to detect the life of the discharge lamp 3; a forced turn-off means 411 to turn off the discharge lamp 3 by receiving the lifetime end signal of the lifetime detecting circuit 42; and a forced lighting means 61 which is energized by the commercial power supply 1 and which lights on the auxiliary lamp 5 at the lifetime end are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a discharge lamp lighting device that forcibly turns off a discharge lamp with a signal that detects an abnormality such as an end of life of a discharge lamp that is a main light source and simultaneously forcibly turns on an auxiliary lamp with a small light output by the signal.

  FIG. 2 shows a general-purpose conventional apparatus. 2 includes an abnormality detection circuit 42 including a tube voltage detection circuit 421, a filament disconnection detection circuit 422, and a no-load detection circuit 423 of the discharge lamp 3, and when the discharge lamp 3 cannot be normally discharged or connected at the end of its life. In case of an abnormality such as a defect, the output signal a part of the abnormality detection circuit is set to HI to prevent accidents such as damage due to abnormal operation of the lighting device, smoke or fire due to overheating, burns or electric shock of the user, and the main lighting circuit 4 This is a conventional discharge lamp lighting device that inputs to the forced extinction terminal 411 of the drive circuit 41 of the inverter to constitute and stops oscillation.

  The conventional device stops oscillation when there is an abnormality such as the end of the life of the discharge lamp. Therefore, when there is only one lighting device such as a general house, the lighting suddenly turns off and the user feels uneasy. , You may feel uncomfortable. Moreover, even if it tries to switch to auxiliary lights, such as a safety ball, it may be confused about switching, without knowing the position of a drawstring or a remote control.

  The object of the present invention is to automatically turn off the discharge lamp to ensure safety at the same time when there is an abnormality such as the end of life of the discharge lamp, which is the main illumination, and automatically turn on the auxiliary lamp. An object of the present invention is to provide a lighting device capable of ensuring a limited brightness.

  The present invention includes a discharge lamp, the discharge lamp main lighting circuit having a forced turn-off function, an auxiliary lamp having a light output smaller than that of the discharge lamp, and the auxiliary lamp lighting circuit having a forced turn-on function. In addition, an abnormality detection circuit that generates a signal in the event of an abnormality such as the end of the life of the discharge lamp is connected, and is connected so as to control the discharge lamp lighting circuit and the auxiliary lamp lighting circuit according to the output signal of the abnormality detection circuit.

  In the case of an abnormality such as the end of the life of the discharge lamp, the present invention automatically turns off the discharge lamp to ensure safety by using the output signal of the abnormality detection circuit, and at the same time, automatically turns on the auxiliary lamp. Thus, a light source can be secured.

  An embodiment of the present invention will be described with reference to FIG. The discharge lamp lighting device according to the present invention shown in FIG. A rectifying / boosting / smoothing circuit 2 connected to the commercial power source 1 is provided. A discharge lamp 3 is provided. A main lighting circuit 4 for lighting the discharge lamp 3 is provided. The main lighting circuit 4 includes a drive circuit 41 having a forced extinction terminal 411 that can be forcibly turned off by an external signal, and an abnormality detection circuit 42. An auxiliary lamp 5 having a light output smaller than that of the discharge lamp 3 is provided. An auxiliary lighting circuit 6 having a forced lighting terminal 61 that turns on the auxiliary lamp 5 and can be forcedly lit by an external signal is provided. In the description of the present embodiment, the case where the abnormality detection circuit 42 includes the tube voltage detection circuit 421 of the discharge lamp 3 will be described.

  In the present lighting device, the discharge lamp 3 is lit by the main lighting circuit 4 energized from the commercial power source 1 via the rectifying / boosting / smoothing circuit 2, but when the discharge lamp 3 is in a normal state, the tube voltage is Since it becomes a normal value, the voltage of the tube voltage detection circuit 421 is less than the threshold value, the output signal a section becomes LO, and the main lighting circuit 4 maintains lighting. When the discharge lamp 3 reaches the end of its life, the tube voltage rises, the voltage of the tube voltage detection circuit 421 exceeds the threshold for life determination, the output signal a part becomes HI, and this signal is connected to the forced turn-off terminal 411 of the drive circuit 41. Since it is input to the forced lighting terminal 61 of the auxiliary lighting circuit 6, the main lighting circuit 4 is stopped, the discharge lamp 3 is turned off, the auxiliary lighting circuit 6 is operated, and the auxiliary lamp 5 is turned on. For this reason, the present discharge lamp lighting device can automatically ensure the brightness according to the output of the auxiliary lamp.

  Although there is no problem even if the auxiliary lamp 5 according to the present invention is provided independently, it is needless to say that there is no problem in using a safety ball used in a general residential lighting fixture. Since a safety bulb lighting circuit is provided from the beginning, if the circuit is used as the auxiliary lighting circuit 6, the discharge lamp lighting device of the present invention can be easily configured.

  It is a circuit diagram of the device of the present invention.   It is a circuit diagram of a conventional device.

Explanation of symbols

1: DC power supply 2: Rectification / smoothing circuit 3: Discharge lamp 4: Main lighting circuit 41: Drive circuit 411: Forced extinction terminal 42: Abnormality detection circuit 421: Tube voltage detection circuit 422: Filament disconnection detection circuit 423: No load detection Circuit 5: Auxiliary lamp 6: Auxiliary lighting circuit 61: Forced lighting terminal

Claims (1)

  A commercial power supply, a discharge lamp, an auxiliary lamp having a light output smaller than that of the discharge lamp, a main lighting circuit that is energized by the commercial power supply to light the discharge lamp, and Comprising a life detection circuit to detect, forcibly turning off the discharge lamp upon receiving a signal at the end of the life detection circuit, forcibly turning on the auxiliary lamp at the end of life A discharge lamp lighting device comprising means.

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