JPH0597098U - Discharge lamp lighting device protection device - Google Patents

Abstract

(57) [Abstract] [Purpose] When a disconnection accident such as connector disconnection or connection failure occurs in the line, the disconnection state is quickly detected and the starting device that generates high voltage is stopped. Perform a protective function against the generation of high voltage when the high pressure discharge lamp is started. [Structure] From a power source 1, an inverter 3, a lighting device 2 composed of a starting device 4 comprising a high voltage generation circuit 7 and a disconnection detection circuit 8 and connectors 5, 5'installed in lines c, c '. A high voltage is applied to the wiring from the output of the starting device 4 to the lamp 6 via the disconnection detection circuit 8 to detect the disconnection state, and the disconnection detection circuit 8 causes the high voltage generation circuit 7 to operate. A configuration that sends a stop signal to the device.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 High-pressure discharge lamps such as mercury lamps and metal halide lamps require a high voltage as a starting voltage, and a high-voltage pulse generated by a starting device is applied to both ends of the lamp to start it. The present invention relates to a protection device for a discharge lamp lighting device.

[0002]

[Prior Art]

 High-pressure discharge lamps such as mercury lamps and metal halide lamps have higher luminous efficiency than incandescent lamps, can be downsized, and can obtain a large luminous flux with low power. Small-sized, low-power high-pressure discharge lamps are being researched and developed for use as light sources such as liquid crystal projectors and vehicle headlights, and are required to be able to be instantly lit. Is difficult to start by instantaneous lighting.

In response to such requirements, it has become feasible to apply a high voltage of about several tens of kv to the lamp to instantly light it at the time of starting. However, applying a high voltage of about several tens of kV to the lamp at the time of start-up poses a problem in terms of safety against high voltage. The high-pressure discharge lamp is installed in a location where sufficient insulation measures can be taken in a place such as a high place where people cannot touch it. In the case of disconnection accidents, methods such as limiting the high voltage generation time with a timed timer or generating high voltage intermittently have been conventionally used.

FIG. 6 shows a discharge lamp lighting circuit diagram of a high-pressure discharge lamp, which includes a lighting device b composed of a power supply a, a power supply switch g, an inverter c and a starting device d, and a high voltage line f. , F'is connected to the lamp L via connectors e, e '. A high voltage is applied to the wiring from the output of the starting device d to the lamp L, and a conductor insulated by an insulator having a high withstand voltage is used for this portion of the wiring. Also, the connectors e and e'having a high withstand voltage are used.

[0005]

[Problems to be solved by the device]

 When using a small, low-power, high-pressure discharge lamp as a light source such as a liquid crystal projector or a vehicle headlight, there is little room to increase the insulation distance, and there is a high possibility that people will touch it. As described above, safety measures against disconnection accidents are still insufficient by methods such as limiting the high voltage generation time with a timed timer or generating high voltage intermittently. Especially in the connector part of the high-voltage line, accidents such as electric shock, smoke emission, or ignition due to electric discharge may occur due to connector disconnection or poor connection.

In view of such a problem, the present invention, when the connector disconnection or connection failure occurs in the connector portion of the high voltage line, quickly detects the connector disconnection and connection failure and detects high voltage. The objective is to fulfill the protective function against the generation of high voltage at the time of starting the high pressure discharge lamp by stopping the starting device to be generated.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is installed in a line having a power source, an inverter, a lighting device composed of a starter consisting of a high voltage generation circuit and a disconnection detection circuit, and a high voltage line and a detection line. A high voltage is applied to the wiring from the output of the starting device to the lamp via the connector, and the disconnection detection circuit detects the disconnection state of the line, and the disconnection detection circuit detects the high voltage generation circuit. The feature is that the generation of high voltage is stopped by sending a stop signal to the.

[0008]

[Action]

 The operation of the present invention will be described. When a disconnection accident such as connector disconnection or connection failure occurs in the line, the disconnection detection circuit quickly detects the disconnection state, and the disconnection detection circuit sends a stop signal to the high-voltage generation circuit. It stops the starting device that produces the voltage.

[0009]

Embodiments Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an electric circuit diagram of the present invention, in which a connector is installed from a power source 1 to a lighting device 2 composed of an inverter 3 and a starting device 4 and high voltage lines a and a ', detection lines b and b'. The lamp 6 is connected via 5, 5 '. A high voltage is applied to the wiring from the output of the starting device 4 to the lamp 6. The starter 4 is composed of a high voltage generation circuit 7 and a disconnection detection circuit 8. When the disconnection detection circuit 8 detects a disconnection cause in the lines C and C, the disconnection detection circuit 8 outputs a high voltage. The stop signal is transmitted to the generation circuit 7.

One end of the inverter 3 → one end of the starting device 4 → one end of the connector 5 → one end of the lamp 6 → one end of the lamp 6 → one end of the connector 5 ′ → another end of the starting device 4 → other of the inverter 3 The circuit composed of one end of is connected by high voltage lines a and a'which are power lines, and one end of the disconnection detection circuit 8 in the starting device 4 → the other end of the connector 5 → the connector 5 '. The circuit composed of the other end → the other end of the disconnection detection circuit 8 is connected by the detection lines B and B '. The detection lines b and b'are weaker in strength than the high-voltage lines a and b'which are power lines, and have a certain resistance value. Then, one ends of the detection lines B and B'form a closed circuit in the lamp 6, and the other ends of the detection lines B and B'are connected to the disconnection detection circuit 8. In the figure, 9 is a power switch.

FIG. 2 is a cross-sectional view showing an example of an electric wire of a line in an electric circuit of the present invention. Using this electric wire, a high voltage wire a, a detection wire b, a b, a b, and a b In order to enable connection and disconnection, multi-pin connectors are used for the connectors 5 and 5 '. The operation state will be described with reference to FIG. During normal circuit operation, the signal currents flow through the detection lines (b) and (b) ', but if a disconnection accident or disconnection of the connector occurs, no signal current will flow. In this state, the disconnection detection circuit 8 detects a change in the electric resistance due to the disconnection of the detection lines b and b ', and sends a stop signal due to this detection to the high voltage generation circuit 7 from the disconnection detection circuit 8 to detect the high voltage. By stopping the high voltage generated by the generation circuit 7 and stopping the starter, the power supply to the lamp 6 is cut off. Even if the high-voltage wires a and a'are not completely broken, if at least one of the detection wires b and b is broken, the broken condition can be detected. Further, the inverter 3 can be stopped by the stop signal from the disconnection detection circuit 8.

It should be noted that the detection lines b and b ′ are weaker in strength than the high voltage lines a and a ′ at a place where stress may be repeatedly applied to the high voltage lines a and a ′ and a disconnection accident may occur. The target is to disconnect the wire first to warn of the occurrence of the wire disconnection accident. It is also possible to provide a damage detection sensor on the lamp 6 and share the signal line with the disconnection detection line. FIG. 3 is an electric circuit diagram showing another example of the present invention. When the same reference numerals as those given to the electric circuit diagram of FIG. 1 are attached to respective parts, both can be similarly explained.

The only difference between the two is the difference in the electric wires, and FIG. 4 is a sectional view showing an example of the electric wires of the line in the electric circuit of the present invention. That is, in FIG. 2, the electric wire in the line C (or line C ′) is composed of one high-voltage line a in the center and four detection lines B, B, B, B, B (or B). In contrast to the high voltage line a'and the four detection lines b ', b', b ', b'), in FIG. 4, one high voltage line b (or one line b) is used. The high-voltage line a ') and one detection line b (or one detection line b') are arranged in parallel.

The operation state will be described with reference to FIG. During normal circuit operation, the signal currents flow through the detection lines (b) and (b) ', but if a disconnection accident or disconnection of the connector occurs, no signal current will flow. This state is detected by the disconnection detection circuit 8, a stop signal resulting from this detection is transmitted from the disconnection detection circuit 8 to the high voltage generation circuit 7, and the high voltage generated by the high voltage generation circuit 7 is stopped to start the starter. This is the same as the case of FIG. 1 in that the power supply to the lamp 6 is stopped by stopping the motor 4.

FIG. 5 shows still another example of the electric wire of the line in the electric circuit of the present invention. As shown in (A), both sides of the tape-shaped conductor x are sandwiched by the insulator y. The detection line X is formed by sandwiching the detection line X on the outer surface of the power line Y as shown in FIG.

[0016]

[Effect of the device]

 The present invention is configured as described above, and when a disconnection accident such as connector disconnection or connection failure occurs in the line, the disconnection state is quickly detected to generate a high voltage starter. By stopping the high-voltage discharge lamp, the generation of high voltage at the time of starting the high-pressure discharge lamp can be stopped, and serious accidents such as high-voltage electric shock and smoke and ignition due to discharge can be prevented.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of the present invention.

FIG. 2 is a sectional perspective view showing an example of an electric wire of a line in an electric circuit of the present invention.

FIG. 3 is an electric circuit diagram showing another example of the present invention.

FIG. 4 is a sectional perspective view showing another example of an electric wire of a line in an electric circuit of the present invention.

FIG. 5 shows another example of an electric wire of a line in an electric circuit of the present invention. (A) is an external perspective view of a part of the detection line cut away, (B) shows the detection line on the outer surface of the power line. The external perspective view of what was wound.

FIG. 6 is a discharge lamp lighting circuit diagram of a high-pressure discharge lamp.

[Explanation of symbols]

 1 power supply 2 lighting device 3 inverter 4 starter 5, 5'connector 6 lamp 7 high voltage generation circuit 8 disconnection detection circuit 9 power switch a, a 'high voltage line b, b' signal line c, c line

Claims (1)

[Scope of utility model registration request] 1. A power supply, an inverter, a lighting device including a starting device including a high-voltage generation circuit and a disconnection detection circuit, and a connector installed in a line having a high-voltage line and a detection line. A high voltage is applied to the wiring from the output of the starter to the lamp, the disconnection detection circuit detects the disconnection state of the line, and the disconnection detection circuit sends a stop signal to the high voltage generation circuit. Due to
A protection device for a discharge lamp lighting device, which stops generation of a high voltage.