JPH0538975A - Vehicular electric discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To improve electrical insulating effect so as to prevent an accident by electric shock or the like positively by covering insulated high pressure lead wires with a protecting tube made of Aramid fiber and improve safety by detecting such abnormality promptly so as to cut off feed to an electric discharge lamp. CONSTITUTION:A lighting device 1 with a battery as power source is provided with a ballast circuit 8 for performing the lighting control of an electric discharge lamp 15, and an igniter circuit 13 for performing the starting control of the electric discharge lamp 15. Both circuits 8, 13 are connected to each other by insulated high pressure lead wires 16, 16' and a connector 17. The respective high pressure lead wires 16, 16' are covered with a protecting tube 18 made of Aramid fiber. The abnormality of voltage value and current value of a feed line at the disconnected or short-circuited time of the high pressure lead wires 16, 16' is detected by an unillustrated abnormality detecting circuit. At the time of detecting abnormality, power supply to the electric discharge lamp 15 is cut off by an unillustrated isolating circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a vehicular discharge lamp, and more particularly to a novel lighting device for a vehicular discharge lamp capable of preventing electric shock and damage to the lighting circuit. Is.

[0002]

2. Description of the Related Art An incandescent light bulb such as a halogen lamp is usually used as a light source for automobiles, and a small metal halide lamp has recently been drawing attention.

The lighting device has a structure in which a battery is used as a power source and a high voltage obtained by boosting the battery voltage is applied to the lamp. A ballast circuit for controlling the lighting of the lamp and an igniter circuit for controlling the start of the lamp are provided. The spaces are connected by high-voltage lead wires.

[0004]

By the way, in the conventional lighting device, when the high voltage lead wire is cut due to some external force (for example, at the time of a collision accident), the core wire is exposed, and an electric shock is generated. There is a problem in that there is a risk of inducing danger such as an accident or ignition of leaked fuel, or causing damage to the lighting device due to disconnection or short circuit of the high voltage lead wire.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention covers a high-voltage lead wire which is insulated and which connects a ballast circuit and an igniter circuit with a protective tube made of aramid fiber, and An abnormality detection circuit that detects an abnormality in the voltage value and / or current value of the power supply line when the lead wire is broken or short-circuited, and a cutoff that cuts off the power supply to the discharge lamp in response to the abnormality detection signal from the abnormality detection circuit And a circuit.

[0006]

Therefore, according to the present invention, since the high-voltage lead wire is protected by the protection tube made of aramid fiber which is excellent in strength and impact resistance and has high electric insulation, the protection through which the high-voltage lead wire is inserted is protected. Even if the high voltage lead wire is broken or short-circuited while an external force is applied to the tube, the protective tube provides electrical insulation to prevent electric shock accidents, and abnormal detection of such an abnormal situation occurs. It is possible to make the safety more reliable by immediately grasping by the circuit and cutting off the power supply to the discharge lamp, and also to protect the lighting circuit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lighting device 1 for a vehicle discharge lamp according to the present invention will be described below with reference to the illustrated embodiments.

FIG. 3 shows an outline of the lighting circuit.

In the figure, reference numeral 2 is a battery, which is connected between the DC voltage input terminals 3 and 3 '.

Reference numerals 4 and 4'represent DC power supply lines, and a lighting switch 5 is provided on one of the plus lines 4.

Reference numeral 6 is a relay, and when an abnormality occurs in the circuit state, the interruption circuit 7 receives a signal from an abnormality detection circuit which will be described later, and opens a relay contact (not shown) provided on the DC power supply line 4 to provide a rear stage. It is provided so as to cut off the supply of the battery voltage to the circuit.

Reference numeral 8 denotes a ballast circuit for controlling the lighting of the metal halide lamp, which has a DC (direct current) booster circuit 9, an inverter circuit 10, and a control circuit 11 for controlling the output voltage of the DC booster circuit 9.

The DC booster circuit 9 is provided in the subsequent stage of the relay 6, and its boosting ratio is changed by a signal from the control circuit 11, whereby the boosting control is performed.

Reference numeral 12 is an abnormality detection circuit, which constantly monitors the operating state of the circuit by detecting the output voltage and output current of the DC boosting circuit 9, and when the abnormal voltage or current is detected, a signal is sent to the cutoff circuit 7. To open the contact of relay 6 and send D
It is provided so as to cut off the supply of the battery voltage to the C booster circuit 9. Regarding the abnormality detection circuit 12 and the cutoff circuit 7, for example, the applicant of the present application has already proposed Japanese Patent Application No.
The circuit proposed in -254953 can be used.

The inverter circuit 10 provided at the subsequent stage of the DC boosting circuit 9 is a circuit for converting the output voltage of the DC boosting circuit 9 into a sine wave AC voltage. For example, a push-pull type self-excited inverter circuit is used.

Reference numeral 13 denotes an igniter circuit for controlling the starting of the lamp, which is arranged in the latter stage of the inverter circuit 10 and has a metal halide lamp 15 connected between its AC output terminals 14 and 14 '.

The metal halide lamp 15 and the igniter circuit 13 together constitute a lamp unit. Between the inverter circuit 10 and the igniter circuit 13, as shown in FIG. High-voltage lead wire 1
6, 16 'are covered by a protective tube 18 made of Kevlar (registered trademark of aramid fiber of DuPont, USA).

That is, as shown in FIGS. 1 and 2, the high voltage lead wires 16 and 16 'and the protective tube 18 constitute a two-core shield wire, and a two-core shield connected to the igniter circuit 13 is provided. The wire and the two-core shielded wire connected to the ballast circuit 8 are connected by a connector 17.

Reference numeral 19 is a two-core shield wire, and one ends of the core wires 20 and 20 'of the high voltage lead wires 16 and 16' are individually connected to an input terminal (not shown) of the igniter circuit 13. In addition, 20a and 20'a are insulation coatings of the core wires 20 and 20 '.

Reference numeral 21 denotes a female connector, which comprises a case made of an insulating material and connector pins arranged in the case.

Reference numeral 22 denotes a case made of an insulating material, in which a receiving concave portion 23 is formed on one surface and a fitting cylindrical portion 24 is projected on the other surface, which are integrally formed.

Numerals 25 and 25 'are connector pins, which are supported by the case 22, one end of which is projected into the fitting cylindrical portion 24, and approximately half of the other end is located in the receiving recess 23. ..

Then, the core wire 20 of the shielded wire 19,
The other end of 20 'is introduced into the fitting cylindrical portion 24 of the case 22 and soldered to the connector pins 25, 25' separately.

The protective tube 18 is externally fitted on the shield wire 19 and the fitting cylinder portion 24.

Reference numeral 26 is a two-core shielded wire, and one ends of the core wires 27 and 27 'of the high voltage lead wires 16 and 16' are individually connected to the output terminals (not shown) of the inverter circuit 10. Incidentally, 27a and 27'a are insulating coatings of the core wires 27 and 27 '.

Reference numeral 28 denotes a male connector, which comprises a case made of an insulating material and a metal fitting supported in the case.

Reference numeral 29 is a case made of an insulating material, and a fitting projection 30 is projected from one end surface of the case, and a fitting cylinder portion 31 is projected from the other end surface thereof. Further, two receiving holes 32, 32 'reaching the inside of the fitting tubular portion 31 from the front end surface of the fitting projecting portion 30 are formed in a penetrating shape, and the receiving holes 32, 32' are formed in the fitting projecting portion 30. Side half 32
The diameters of a and 32'a are slightly larger than those of the remaining portions 32b and 32'b.

Reference numerals 33 and 33 'denote receiving fittings, which are cylindrical receiving portions 33a and 33'a and a pin-shaped connecting portion 33.
b and 33'b are integrally formed of a conductive metal material. The receiving parts 33a, 33'a of the receiving fittings 33, 33 'have the receiving holes 3 of the case 29.
2, 32 'is fitted into the large-diameter portions 32a, 32'a, the connecting portions 33b, 33'b are inserted through the portions 32b, 32'b, and the tips thereof are projected into the fitting tubular portion 31. ing.

The other ends of the core wires 27 and 27 'are introduced into the fitting cylinder portion 31 of the case 29, and the receiving metal fitting 3
Soldered separately to the connection portions 33b and 33'b of the reference numeral 33 and 33 '.

The protective tube 18 is externally fitted on the shield wire 26 and the fitting cylinder portion 31.

To connect the ballast circuit 8 and the igniter circuit 13, the fitting projection 30 of the male connector 28 is fitted into the receiving recess 23 of the female connector 21. Then, the connector pins 25, 25 ′ of the female connector 21 become
The ballast circuit 8 and the igniter circuit 13 are connected to each other by being fitted into the receiving portions 33a and 33'a of the 33 '.

That is, the core wire 20 of the shield wire 19, the connector pin 25, the receiving fitting 33, and the core wire 27 of the shield wire 26.
Corresponds to the high-voltage lead wire 16, and the core wire 20 ′ of the shield wire 19, the connector pin 25 ′, the receiving fitting 33 ′, and the core wire 27 ′ of the shield wire 26 correspond to the high-voltage lead wire 16 ′.

In the above lighting device 1, however, the high voltage lead wires 16 and 16 'connecting the inverter circuit 10 and the igniter circuit 13 are protected by the protective tube 18 made of Kevlar, so that the mechanical strength is improved. Excellent, and if an external force is applied to the protective tube 18, the high voltage lead wires 16 and 16 'in the tube will be disconnected or short-circuited first, but the protective tube 18 provides electrical insulation to the outside of the tube. It is guaranteed, and the abnormality detection circuit 12 immediately deals with the abnormality of the circuit state and opens the contact of the relay 6 through the cutoff circuit 7 to cut off the electric power supply to the metal halide lamp 15, thereby causing an electric shock accident or a lighting circuit. It is possible to take thorough safety measures against damage to the product.

[0034]

As is apparent from the above description, according to the lighting device for a vehicle discharge lamp of the present invention, the high voltage lead wire, which is insulated and covers the ballast circuit and the igniter circuit, is protected by the aramid fiber. By covering with a tube, the core wire is not exposed due to the breakage of the high voltage lead wire, which prevents the user from being exposed to the risk of electric shock.In addition, the abnormal state of the lighting circuit is quickly detected and the power supply to the discharge lamp is shut off. By doing so, it is possible to protect the circuit and prevent the occurrence of a secondary disaster.

It should be noted that any of the specific shapes and structures shown in the above embodiments are merely examples for embodying the present invention, and the technical scope of the present invention is limitedly interpreted by these. It is not something that will be done.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a main part of an example of an embodiment of a lighting device for a vehicle discharge lamp according to the present invention.

FIG. 2 is a side view showing a ballast circuit, an igniter circuit, and a connecting portion between them.

FIG. 3 is a block diagram showing an outline of a lighting circuit.

[Explanation of symbols]

1 Vehicle Discharge Lamp Lighting Device 7 Breaking Circuit 8 Ballast Circuit 12 Abnormality Detection Circuit 13 Igniter Circuit 15 Discharge Lamp 16 (20, 25, 27, 33) High Voltage Lead Wire 16 ′ (20 ′, 25 ′, 27 ′, 33) ´） High voltage lead wire 18 Protective tube

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H05B 41/18 X 7913-3K

Claims (1)

[Claims] 1. A lighting device for a vehicle discharge lamp, comprising a ballast circuit for controlling lighting of a discharge lamp and an igniter circuit for applying a starting signal to the discharge lamp, wherein the ballast circuit and the igniter circuit are connected to each other. An anomaly detection circuit that covers the insulated high-voltage lead wire with a protective tube made of aramid fiber, detects an anomaly in the voltage value and / or current value of the power supply line when the high-voltage lead wire is disconnected or short-circuited, and the anomaly detection circuit. A lighting device for a vehicle discharge lamp, comprising: a shutoff circuit that shuts off power supply to the discharge lamp in response to an abnormality detection signal from the circuit.