JPH0352189Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an automobile light forgetting prevention device that is applied to automobiles and forcibly turns off the lights when predetermined conditions are met.

<Conventional technology> Conventionally, when the driver leaves the vehicle, etc.
Even if you forget to turn off the light, if a predetermined condition (for example, the ignition switch is turned off) is met, a so-called forget-to-turn-off device is available that forcibly turns off the light.

As shown in FIG. 2, such a device for forgetting to turn off a light generally has a light switch 21 corresponding to a headlight, tail light, etc., and an ignition switch 22 connected to an input terminal of a logic circuit section 23. , the output signal of the logic circuit section 23 is supplied to the base terminal of the switching transistor 24, and the relay coil 26 is connected to the collector terminal of the power switch transistor 25 which uses the collector terminal potential of the switching transistor 24 as a base bias. The contact 27 is connected in series to a light 28 such as a headlight or a taillight. The light switch 21 is connected to the ground terminal, and the ignition switch 22 is connected to the ground terminal.
is connected to the power terminal. The base terminal of the power switching transistor 25 is connected to the ground terminal via the light switch 21.

Therefore, the ignition switch 22
In the ON state, the light switch 21
The light 28 can be turned on and off in response to ON and OFF.

When the ignition switch 22 is in the OFF state, the power switching transistor 25 is turned off by the output signal from the logic circuit section 23, and the power to the lamp 28 can be forcibly cut off.

<Problems to be solved by the invention> In the device for preventing forgetting to turn off the light with the above configuration, the signal for forcibly turning off the light 28 is the logic circuit section 23, which is composed of an IC or the like, so the circuit configuration is Since the system is complicated and has a high possibility of failure, there is a possibility that the lights 28, such as headlights and taillights, may go out while driving.

Although this possibility is by no means highly probable, once a situation in which the light 28 goes out as described above occurs, there is a problem in that it will cause a serious accident such as an accident resulting in injury or death.

<Purpose of the invention> This invention was made in view of the above-mentioned problems, and aims to provide a device for preventing forgetting to turn off the lights of an automobile, which prevents the lights from turning off while the vehicle is driving.

<Means for Solving the Problems> In order to achieve the above object, the device for preventing forgetting to turn off the automobile lights of this invention includes a light drive circuit that drives the lights, an ignition switch, and an ignition switch. A power supply connected to the power source, a light switch that instructs the light to turn on and off, and a light switch that is connected to the ignition switch and the light switch, and sends a light on/off signal to the light drive circuit based on the switching of these two switches. and a logic circuit that outputs a light off signal in order to automatically turn off a light that has been forgotten to be turned off under certain conditions when the ignition switch is off. and a light drive auxiliary circuit directly connected between the light switch and the light drive circuit, and when the ignition switch is on, the power supply connected to the ignition switch is connected to the light drive auxiliary circuit to drive the light. By directly supplying the light to the circuit, the light drive circuit is enabled to operate regardless of the state of the control signal from the logic circuit, and the light can be turned on/off in accordance with the on/off state of the light switch.

<Function> With the above-described device for preventing forgetting to turn off the lights of a car, when the ignition switch is in the ON state, a signal equivalent to the light turn-on signal is supplied to the light drive circuit, and a signal equivalent to the light turn-on signal is supplied from the logic circuit. light switch without being affected by the signal.
In response to ON and OFF, the light drive circuit performs a light lighting operation and a light extinguishing operation, so that the light can be turned on and off.

In addition, when the ignition switch is in the OFF state, when a predetermined condition such as the passage of a certain period of time is met, a light extinguishing signal is supplied from the logic circuit to the light drive circuit, so the light is forcibly extinguished. be able to.

<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.

FIG. 1 shows an electric circuit showing an embodiment of the device for preventing forgetting to turn off a car light according to this invention, in which a ground terminal is connected to an input terminal of a logic circuit section 1 consisting of an IC, etc. via a light switch 2. At the same time, a power terminal is connected via an ignition switch 3. The base terminal of a switching transistor 4 is connected to the output terminal of the logic circuit section 1, and the power switching transistor 6 has a base terminal connected to the collector terminal of the switching transistor 4 via a resistor 13 and a resistor 5.
A relay coil 7 is connected to the collector terminal of the relay coil 7, and a lamp 9 is connected in series with a normally open relay contact 8 driven by the relay coil 7. A forward-connected diode 10 is connected between the input terminal of the logic circuit section 1 to which the ignition switch 3 is connected and the connection point between the resistors 13 and 5.
and a resistor 11 are connected in series, and the input terminal of the logic circuit section 1 to which the light switch 2 is connected is directly connected to the emitter terminal of the power switching transistor 6. The input terminal of the logic circuit unit 1 connected to the power switching transistor 6 is connected to the base terminal of the power switching transistor 6 via a base bias resistor 12.

The operation of the device for preventing forgetting to turn off the light having the above configuration is as follows.

When the ignition switch 3 is in the ON state, the power supply voltage is applied to the base terminal of the power switching transistor 6 through the diode 10 and the resistors 11 and 5. The switching transistor 6 is turned on and off, and the energization of the relay coil 7 is controlled. Therefore, relay contact 8 becomes ON state and OFF state,
The light 9 can be turned on or off. In other words, the light switch 2 can be turned on and off without being affected by the output signal from the logic circuit section 1.
It is possible to turn on and off the lights 9 corresponding to the lights 9, thereby improving safety.

Furthermore, even if the switching transistor 4 turns on due to a malfunction in the logic circuit section 1 (in this case, the light would turn off in the conventional circuit shown in FIG. 2),
Due to the presence of the resistor 13, voltage is applied from the ignition switch 3 to the base of the power switching transistor 6, so that the light switch 2
The lighting can be controlled depending on whether the light is turned on or off. Therefore, the influence of malfunction of the logic circuit section 1 can be avoided.

Also, when ignition switch 3 is OFF and light switch 2 is ON,
Since the logic circuit section 1 outputs a light extinguishing signal when a predetermined condition is satisfied, the power switching transistor 6 is turned off, and the light 9 can be extinguished. Therefore, forgetting to turn off the light can be prevented.

Further, since a part of the operation logic can be carried out by the write drive circuit and the write drive auxiliary circuit, it is possible to simplify the configuration of the logic circuit section 1.

<Effects of the invention> As described above, this invention can reliably prevent the inconvenience of the lights going out while driving even if a failure occurs in the logic circuit section, and This has the unique practical effect of simplifying the configuration of the logic circuit section.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an embodiment of the device for preventing forgetting to turn off a car light of this invention, and FIG. 2 is an electric circuit diagram showing a conventional example. 1...Logic circuit section, 2...Light switch, 3
...Ignition switch, 6...Power switching transistor, 7...Relay coil, 8
... Relay contact, 9 ... Light, 10 ... Diode, 5, 11, 12 ... Resistor.

Claims (1)

[Claims for Utility Model Registration] A light drive circuit that drives a light, an ignition switch, a power supply connected to the ignition switch, a light switch that instructs on/off of the light, and an ignition switch. It is connected to the ignition switch and light switch, and supplies a light on/off signal to the light drive circuit based on the switching of these two switches, and when the ignition switch is off, the light that has been forgotten to be turned off under certain conditions and a logic circuit that outputs a light off signal to automatically turn off the light, and further includes an ignition switch and a light drive auxiliary circuit directly connected between the light switch and the light drive circuit, When the ignition switch is on, the power connected to the ignition switch is directly supplied to the write drive circuit through the write drive auxiliary circuit, and the write drive circuit is activated regardless of the state of the control signal from the logic circuit. A device for preventing forgetting to turn off a light for an automobile, characterized in that the device is operable and the light can be turned on/off according to the on/off of a light switch.