JPH04100742A - Electric discharge head lamp device for vehicle - Google Patents

Abstract

PURPOSE:To prevent the breakage of a lighting circuit by prohibiting the operation of lighting circuits 10, 20 when a connecting condition detecting means detects a connecting cable not connecting. CONSTITUTION:A lighting control means prohibits the operation of lighting circuits 10, 20 when a connecting condition detecting means CN, SG detects a connecting cable CB not connecting the lighting circuit 10, 20 and a discharge lamp bulb HV. Accordingly, only when the connecting cable CB is connected, the lighting circuits 10, 20 are operated to light the discharge lamp bulb HV. Thus, it is possible to prevent the breakage of the lighting circuits 10, 20 when the connecting cable is not connected or the connection is bad.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a sootlamp device for a vehicle discharge lamp.

B. Prior Art A discharge lamp lighting device disclosed in Japanese Unexamined Patent Publication No. 63-62187 has been known. This discharge lamp lighting device consists of a power supply circuit that converts DC power input into AC voltage and applies it to the discharge lamp by switching semiconductor switching elements, and a starting circuit that applies high voltage pulses to the discharge lamp to start the discharge lamp. The discharge lamp bulb is lit via the connecting cable by a lighting circuit consisting of.

C1 Problems to be Solved by the Invention However, in such a conventional discharge lamp lighting device,
Even if the connection cable between the discharge lamp bulb and the lighting circuit is not connected or there is a poor connection, when the power is turned on, a high-voltage pulse will be generated from the starting circuit, so the discharge lamp bulb will be connected normally to the output terminal of the lighting circuit. There is a problem in that an abnormally high voltage, which is even higher than when the lamp is connected, occurs and damages the lighting circuit.

An object of the present invention is to provide a discharge lamp headlamp device for a vehicle that prohibits operation of a lighting circuit when a connection cable between a discharge lamp bulb and a lighting circuit is not connected.

The present invention will be explained in conjunction with FIGS. 1 and 2, which are examples of means for solving the problems. Discharge lamp bulb H
The present invention is applied to a vehicle headlamp device including a lighting circuit 10.20 that applies a voltage to V via a connection cable CB to turn on the lamp.

and connection state detection means CN and SG for detecting the connection state of the connection cable CB;
The above object is achieved by including lighting control means 11.13 which prohibits the operation of the lighting circuit 10.20 when it is detected by the SG that the connection cable CB is not connected.

E9 action lighting control means 11.13 includes connection state detection means CN, S
When it is detected by G that the connection cable CB between the lighting circuit 10.20 and the discharge lamp bulb HV is not connected, the operation of the lighting circuit 10.20 is prohibited.

Therefore, the lighting circuit 10.20 operates to light the discharge lamp bulb HV only when the connection cable CB is connected.

In the above-mentioned sections and section E, which describe the present invention in detail, reference numerals of the embodiments are used to make the present invention easier to understand, but the present invention is not limited to the embodiments.

F. Example An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a longitudinal cross-sectional view of a headlamp HL of a vehicle headlamp device according to the present invention, viewed from the side of the vehicle. A reflector 2 coated with a reverse slope 2a is installed in the housing 1 via a mounting member (not shown), and a valve assembly 3 is removably attached to the base of the reflector 2. The open rear end of the housing 1 is closed with a cap 4, and a lens 5 is attached to the open front end. Two such discharge lamp headlamps HL are usually installed on the left and right sides of the front of the vehicle, and are attached to the space between the bumper 6 and the engine hood 7.

The bulb assembly 3 is composed of a base 8 that is removably attached to the base of the reflector 2, and a discharge lamp bulb HV that is provided on the vehicle front side of the base 8. The electrodes of the discharge lamp bulb HV are connected to the cap 4. It is connected to the cable CB via the connector CN attached to the housing, and is connected to the left and right headlamp lighting circuits 10.20 outside the housing.

FIG. 2 shows a lighting circuit for a discharge lamp headlamp. Note that the left and right headlamp lighting circuits 1o and 20 are the same, and the right headlamp lighting circuit 10 will be described below.

The right headlamp lighting circuit 10 includes a dimmer lamp lighting control circuit 11. Dimmer lamp lighting times Ml 2゜The power supply voltage applied to the main circuits of the main lamp lighting control circuit 13 and the main lamp lighting circuit 14, the circuit protection fuse Fl, the power supply opening/closing relay Ryl, and the above main circuits is reduced to a predetermined voltage or below. It is composed of the following circuit components: a Zener diode ZDI for suppression, a power supply voltage smoothing capacitor C1, a signal input circuit resistor R1, and a signal voltage inversion inverter N0TI.

When the connection cable CBI to the Dimmer discharge lamp bulb HVI is properly connected to the connector CNI, the Dimmer lamp lighting control circuit 11 supplies power from the battery BAT to the Dimmer lamp lighting circuit 12 to operate it. The dimmer lamp lighting circuit 12 includes a cable CBI and a connector CNI.
Turn on the Dima discharge lamp bulb HVI through the . The main lamp lighting control circuit 13 and the main lamp lighting circuit 14 are the same as the dimmer lamp lighting control circuit 11 and the dimmer lamp lighting circuit 12, and light the main discharge lamp bulb HV2.

The right headlamp lighting circuit 10 also includes a lighting switch S that lights the left and right headlamps HL via a terminal TB2.
A beam changeover switch S is connected to the WI and further switches between the main beam and the dimmer via the terminal TB3.
Connected to W2.

Note that these switches SWI and SW2 are connected to terminals TB102. of the left headlamp lighting circuit 20 having the same function. It is also connected to TB103, and the left and right headlamps HL are turned on and off and beams are switched simultaneously.

Further, the right headlamp lighting circuit 10 is connected to the warning light SLI via the terminal TB4, and the dimmer discharge lamp bulb H
This warning light SL1 is turned on when the cable CBI connected to the VI has a poor connection or is not connected. Similarly, the right headlamp lighting circuit 10 is connected to the warning light SL2 via the terminal TB9, and lights the warning light SL2 when the cable CB2 connected to the main discharge lamp bulb HV2 is defective or disconnected.

FIG. 3 is a detailed circuit diagram of the dimmer lamp lighting control circuit 11 and the dimmer lamp lighting circuit 12.

The main lamp lighting control circuit 13 and the main lamp lighting circuit 14 are the same as these dimmer lamp circuits, and the dimmer lamp circuit will be described below.

The dimmer lamp lighting control circuit 11 includes a control relay Ry2.
and its contacts Ry2a and Ry2b, and when the cable CBI is correctly connected to the connector CN1, the power from the battery BAT is connected to the dimmer lamp lighting circuit 1.
Supply to 2. If the cable CBI is not connected to the connector CNI or there is a poor connection, the power supply to the dimmer lamp lighting circuit 12 is stopped and the warning light SLI is turned on.

The dimmer lamp lighting circuit 12 is connected to the dimmer lamp power supply circuit 1.
21 and a dimmer lamp starting circuit 122.

The dimmer lamp power supply circuit 121 includes a pulse generator PGI,
Inverter for signal inversion N0T2. Transistors Tri, T activated by control signals from pulse generator PGI
r2 and a power transformer T1, and converts DC power input from battery BAT into AC voltage in the following manner.

The DC power supplied from the battery BAT via the dimmer lamp lighting control circuit 11 is connected to the primary winding T of the transformer T1.
It is input to the center tap CT of ip. transformer T1
Transistors Tri and Tr are connected to both ends of the primary winding TIP.
2 are connected.

These transistors Tri and Tr2 are alternately turned on and off according to the pulse signal from the pulse generator PGM, so that currents in opposite directions alternately flow through the primary winding Tip of the transformer T1, and the secondary winding Tls An alternating current voltage proportional to the winding ratio between the primary and secondary windings is generated.

The dimmer lamp starting circuit 122 includes capacitors C2 and C3.
and a voltage doubler generating circuit consisting of diodes Di and D2,
It is composed of a pulse transformer T2 and a discharge gap HGI, and boosts the AC voltage from the Dimaranob power supply circuit 121 to a high voltage in the following manner when starting the Dimaran discharge lamp bulb HVI.

The daylight lamp power supply circuit 121 starts up and the terminals 12f, 1
When a positive voltage appears at 2h, the capacitor C2 is charged via the diode D1, and the connection point 12k between the diode D1 and the capacitor C2 is almost connected to the dimmer lamp power supply circuit 1.
A voltage equal to the peak value V of the output voltage of 21 is generated.

Next, when a positive voltage appears at the terminals 12g and 12j in this state, the potential at the connection point 12 is further pushed up by a voltage of 2 to 2V, charging the capacitor C3 via the diode D2. This increases the voltage across the capacitor C3, and this voltage is applied to the discharge gap HGI via the primary winding T2p of the transformer T2. When the voltage across the discharge gap HGI reaches a predetermined value, dielectric breakdown occurs, and the charge in the capacitor C3 is discharged through the primary winding T2p of the transformer T2. As a result, the discharge lamp bulb HVI is #f in the secondary winding of transformer T2 @T2s.
! , an edge-breaking high voltage is generated, which is applied via the connecting cable CBI and the connector CNI to the electrodes of the discharge lamp bulb HVI, and the discharge lamp bulb HVI is started. After starting, the discharge lamp bulb HV1 continues to discharge with the AC voltage from the dimmer lamp lighting circuit 121.

Next, the cable CB1 and connector CNI connected between the headlamp lighting circuit 10 and the dimmer discharge lamp bulb HVI will be explained.

The power supply wiring for the daylight discharge lamp bulb HVI is connected to the terminal TB7 of the right headlamp lighting circuit 10. TB8 to cable CB
It is connected to the connector CNI via I, and further connected to the electrode of the daimer discharge lamp bulb HVI via the connector CNI. Further, signal lines 5Gla and 5G1b for detecting the connection state of cable CBI are connected from terminal TB5.6 to connector CNI via cable CBI. The outgoing path 5G1a and the incoming path 5G1b of this signal line are connected to connector C.
There is a short circuit on the HVI side of the NI discharge lamp bulb. Now, if this cable CBI is disconnected or has a poor connection with the connector CNI, the power supply wiring of the discharge lamp bulb HVI will be out of conduction, and the outbound path AG1a and return path 5Glb of the signal line will be out of conduction. state.

Note that the cable CB2 and connector CN2 for the main discharge lamp bulb HVZ are the same as those for the dimmer discharge lamp bulb HVI, and their explanation will be omitted.

Next, the operation of this embodiment will be explained.

When the power switch SWI is turned on while the beam changeover switch SW2 is open as shown in FIG. Power is supplied from battery BAT.

At this time, since the switch SW2 is open, the voltage of the battery BAT is applied to the control terminal 12b of the dimmer lamp lighting circuit 12 via the resistor R1, and a start signal is input to the pulse generator PCI of the dimmer lamp power supply circuit 121 described above. be done. On the other hand, an inverter NOT 1 is connected between the control terminal 14b of the main lamp lighting circuit 14 and the resistor R1.
is connected, the control terminal 14b is held at Lo level, and the operation of the main lamp lighting circuit 14 is stopped.

The battery voltage applied to the terminal 11a of the dimmer lamp lighting control circuit 11 is applied to the outgoing signal line 5Gla via the terminal 11c of the same circuit and the terminal TB5 of the lighting 1 path 10. Now, if the cable CBI is correctly connected to the connector CNI, the battery voltage will be the return signal line SG]
, b to the terminal TB6 of the lighting circuit 10 and the terminal 11cl of the dimmer lamp lighting control circuit 11. At this time, since the outgoing path 5Gla and the incoming path 5G1b of the signal line are short-circuited by the connector CN1, the potential difference between the terminal 11c and the terminal lid is O. Therefore, Dimara knob 11
relay Ry2 connected between terminal 11c and lid of
is turned off, and the battery voltage is applied from the terminal lid to the power supply terminal 12a of the dimmer lamp power supply circuit 121 via the relay contact R:y2b and the terminal lie. That is, the power of the dimmer lamp power supply circuit 121 is turned on, and as described above, the input DC voltage is converted into an AC voltage and outputted to the dimmer lamp starting circuit 122. Then, the dimmer lamp starting circuit 122 further boosts the input AC voltage to generate a high voltage, and connects the cable CBI and the connector C
The voltage is applied to the discharge lamp bulb HV1 via NI to light it up.

If the cable CBI is not connected correctly to the connector CNI, or if the connection is poor, the outgoing signal line 5
Since G1a and the return path 5G1b are opened at the connector CNI, the terminal 11c of the dimmer lighting control open circuit 11 and the terminal 11
A voltage approximately equal to the battery voltage appears between d and d, and relay Ry2 is turned on. As a result, the power supply to the dimmer lamp power supply circuit 121 is completely cut off by the relay contact Ry2b6 Furthermore, the relay contact Ry2a is closed and the battery voltage is applied to the warning light SLI via the terminal Llb and the terminal TB4, and the warning light SLI is Light SL1 lights up.

Note that when the beam changeover switch SW2 is turned on, the control terminal 12b of the dimmer lamp lighting circuit 12 goes to Lo level and its operation is stopped, while the control terminal 14 of the main lamp lighting circuit 14 goes to Hi level and the same goes. The circuit is activated and the main discharge lamp bulb HV2 is lit. This lighting operation and the operation when the cable CB2 is not connected are the same as those of the Dima discharge lamp bulb HVI, and the explanation thereof will be omitted.

In this way, when the cable CB that supplies lighting power to the discharge lamp bulb HV is not properly connected to the connector CN, the lamp lighting control circuit 11. Since the supply of battery power to the lighting circuit 12.14 is stopped, when the cable CB is disconnected or has a poor connection, the lighting circuit 10.20 may be inadvertently activated and damaged by abnormally high voltage. do not have.

In the above embodiment, when the cable CB is disconnected or has a poor connection, the power to the lighting circuit is cut off and its operation is prohibited, but it is also possible to cut off the start signal input to the lighting circuit or turn off the lighting switch. You can.

In the configuration of the above embodiment, the left and right Soto lamp lighting circuits 10.20 constitute a lighting circuit, the connector ON and signal line SG constitute connection state detection means, and the lighting control circuits 11.13 constitute lighting control means, respectively.

G9 Detailed explanation of the invention According to the present invention, the operation of the lighting circuit is prohibited when the connection cable between the discharge lamp bulb and the lighting circuit is not connected, so lighting is disabled when the discharge lamp bulb is not connected or there is a poor connection. There is no circuit damage and the reliability of the discharge lamp headlamp device is improved.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a headlamp according to an embodiment as seen from the side of the vehicle, Fig. 2 is a lighting circuit diagram of the headlamp, and Fig. 3
The figure is a detailed circuit diagram of a lighting circuit and a lighting control circuit. 3: Valve assembly 4: Cap 8: Base
10: Right side lamp lighting circuit 11: Daylight lamp lighting control circuit 12: Daylight lamp lighting circuit 13: Main lamp lighting control circuit 14: Main lamp lighting circuit 20: Left headlamp lighting circuit HL: Headlamp HV, HVI, HV2: Discharge lamp Valve CB, CBI,
CB2: Cable CN, CNI, CN2: Connector SG, SGI, SG2: Signal line SLI, SL2: Warning light SWI: Lighting switch SW2: Beam selection switch

Claims (1)

[Scope of Claims] A vehicle headlamp device comprising: a discharge lamp bulb installed in a headlamp housing; and a lighting circuit that applies a voltage to the discharge lamp bulb via a connection cable to turn it on. The device is characterized by comprising a connection state detection means for detecting the connection state of the connection cable, and a lighting control means for prohibiting the operation of the lighting circuit when the connection state detection means detects that the connection cable is not connected. A headlamp device for vehicles.