JP2007001554A - Circuit for detecting blow-out of lamp bulb - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect early the blow-out of an incandescent lamp provided in every place to restore the original condition early, by using a light emitting diode. <P>SOLUTION: One incandescent lamp and one light emitting diode are connected in series to each other for electrical continuity to form a circuit for detecting whether the lamp is blew out or not. As the light emitting diode, the light emitting diode having an internal resistance value 100 times of that of the lamp to be detected is used. Visible luminance of the light emitting diode is the same with that of a case of direct connection to a power source. A difference of charge in a general meter in each case is too small to detect. When lighting the lamp, the lamp is directly connected to the power source through a contact point of a relay. About the lamp to be used for aviation and navigation, a visible distance of the light has to clear a numeric value instructed in a specification, but this circuit device can solve almost problems at low costs. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to detection of filament breakage in a system in which an electric current is directly passed through a filament inside the bulb to incandescent.

Conventional light bulb disconnection detection circuits are complicated in circuit itself, or as a result of providing the detection circuit, a slight electrical resistance is inserted between the power supply and the light bulb, and the brightness of the light bulb is not necessarily specified. It was not street.
Japanese Patent Laid-Open No. 56-99996 (apparatus for confirming lighting of light)

  A light emitting diode is used to detect the disconnection of the bulb, but the bulb electrode must be directly connected to the power supply when the bulb is lit.

  No matter where a light bulb is installed, a circuit that can grasp all of its existence at a glance by using a light emitting diode. In the case of an automobile, a light emitting diode that detects disconnection of the foot brake lamp is installed around the hand brake lamp in the dashboard. A switch for turning on the hand brake lamp is also used as a switch for checking the foot brake lamp. As a result, when the hand brake lever is operated, the light emitting diode functions simultaneously.

  The light emitting diode is small and has a long life. A circuit that detects the disconnection of a light bulb is constructed by utilizing the property of operating with a very weak current.

  When one and one light bulb and one light emitting diode are connected in series and energized, the light emitting diode is turned on. Second, the light emitting diode will not light up if the bulb is broken. Third, when the light bulb is used as a natural light, it is connected directly to the power supply through the relay contact. A circuit that satisfies these three requirements is manufactured.

  Use a light emitting diode whose internal resistance is 100 times that of a light bulb. As a result, the luminance of the light emitting diode does not change as long as it is visually observed as compared with the case where the electrode is directly connected to the power source. Moreover, even if the charge is actually measured, a general instrument cannot distinguish between the two cases. Based on this support, the most important point of the present invention is to fulfill the purpose while maintaining the performance of the light emitting diode.

  The present invention has an effect that a driver or an operator can easily carry out himself / herself at any time as well as entrusting the manager to detect the disconnection of the light bulb.

  Since all the parts constituting the invention are commercialized by a known technique, only the bulb disconnection detection circuit is the subject of this invention.

  The present invention is applied to a lamp that is ignited by passing an electric current directly through a filament in a light bulb.

  Since the present invention has a wide range of implementation, a circuit for detecting disconnection of an automobile foot brake lamp will be described as an example.

  For example, regarding the circuit for detecting the disconnection of a foot brake lamp in an automobile in which the circuit operates with a direct current of 12 (V), the charge of main components is as follows.

  Since the standard power consumption of one foot brake lamp is 23 (W), the current is about 2 (A), and the current required for the light emitting diode is 0.02 (A) or less. The color emitted from the light emitting diode is, for example, green.

  Hereinafter, the disconnection detection circuit of two foot brake lamps will be described with reference to FIGS. However, in FIG. 1 to FIG. 4, the ignition circuit is not shown in the figure, but it is assumed that the ignition circuit is all open, and the switch for detecting the disconnection of the foot brake lamp has no other trouble. Also used as a switch.

  FIG. 1 shows a basic implementation circuit of the present invention. FIG. 1 shows a state in which the automobile is parked with a hand brake and only the circuit of the hand brake switch 6 is opened.

  Accordingly, the hand brake lamp 7 is lit, and the current is further grounded through the light emitting diodes 8 and 9 and the foot brake lamps 4 and 5, respectively. If the foot brake lamps 4 and 5 are both normal, the light emitting diodes 8 and 9 are lit.

  At this time, the light emitting diode 8 is not lit when the foot brake lamp 4 is disconnected, and the light emitting diode 9 is not lit when the foot brake lamp 5 is disconnected. As a result, the driver of the car can immediately know where the foot brake lamp is disconnected while in the driver's seat. In addition, even if either or both of the light emitting diodes 8 and 9 are not lit, the hand brake lamp 7 remains lit according to the specifications of the car until the hand brake lever is restored. Yes.

  FIG. 2 shows a state where the vehicle is running or stopped and all the switches are closed. Accordingly, the light emitting diodes 8 and 9 are not lit.

  In FIG. 3, the automobile is running or stopped, but only the foot brake pedal is depressed to open the foot brake switch 1.

  When the foot brake switch 1 is opened, the foot brake lamp switch 3 which is incorporated in the relay 2 surrounded by the two-dot chain line and is opened and closed in conjunction with the opening and closing is opened. -Key lamps 4 and 5 are lit. At this time, there is no electrical resistance between the power source and the foot brake lamps 4 and 5, respectively.

  In the case of item 19, each of the light emitting diodes 8 and 9 does not pass current, and therefore does not light with the hand brake lamp 7.

  FIG. 4 shows a state where the automobile is stopped, the hand brake lever is pulled to open the circuit of the hand brake switch 6, and the foot brake pedal is stepped on. In this case, the hand brake lamp 7 and the foot brake lamps 4 and 5 are lit normally, but neither of the light emitting diodes 8 and 9 is lit. At this time, the light emitting diode is because both electrodes are positive, but it does not give any trouble to the whole.

Effects of inventions in automobiles

  A function to detect disconnection of the foot brake lamp was added to the hand brake lever.

  According to paragraph 22, when the driver is in the driver's seat and operates the hand brake lever by releasing the foot brake pedal without turning on the switch for special inspection, the hand brake lamp lights up and two The state of the foot brake lamp can be automatically detected. Depending on the result, the foot brake lamp can be replaced as soon as possible, leading to safer operation.

In the basic circuit of the present invention, the automobile is stopped. The car is running or stopped The car is running or stopped The car is parked

Explanation of symbols

1 foot brake lamp lighting switch 2 relay operated by opening and closing switch 1
Foot brake lamp switch 4 incorporated in 3 relay-2, which opens and closes in conjunction. 4 foot brake lamp 5 foot brake lamp 6 hand brake lamp 7 switch, foot brake lamps 4 and 5 Switch 7 serving as a switch for disconnection detection circuit 7 Hand brake lamp 8 Light-emitting diode 9 Light-emitting diode 10 Power supply

Claims (3)

  Of the light bulbs, a method in which an electric current is directly passed through a filament inside the light bulb to incandescent it, and it is easy to detect a broken light bulb by using a light emitting diode regardless of where the light is attached. circuit.   A circuit in which a light-emitting diode is placed at the place where the light bulb is lit, and a model of the position where the light bulb is installed is placed there.   When the driver or operator turns on the switch for inspection during the initial inspection, the light-emitting diode lights up, but the light-emitting diode where the bulb is disconnected does not light up.

Images