JPS5852638Y2 - Vehicle flashing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flashing device for a vehicle, and more particularly to a device having a function of detecting disconnection of a direction indicator light, which is a load.

Turn signal lights are extremely important for ensuring safe driving of a vehicle.

Therefore, a vehicular flashing device that controls blinking of a direction indicator light needs to have a function of detecting disconnection of the direction indicator light, which is a load.

In addition, when the driver confirms that the turn signal light is disconnected,
It is desirable that the flashing speed of other normal direction indicator lights increases when the line breaks.

Conventionally, as a vehicle flashing device equipped with the above-mentioned functions, a charging circuit is used, for example, as shown in FIG. 5, the reed switch 3 is connected to a voltage coil 6 and a current coil 7 for detecting the current flowing to the direction indicator light.
A circuit using a disconnection detection circuit that is controlled by the following is known.

However, the conventional disconnection detection circuit described above has the disadvantage that the voltage coil 6 and the current coil 7 must be wound coaxially around the reed switch 3, making the configuration complicated and difficult to manufacture.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and by placing the reed switch of the disconnection detection circuit close to the voltage coil of the relay that intermittents the current of the direction indicator light, the leakage magnetic flux of the voltage coil and the direction indicator The present invention is characterized in that the reed switch is controlled by the magnetic flux of the current coil that detects the current of the lamp.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

In Figure 2, 8 is a battery whose cathode is grounded.
The anode of the battery 8 is connected to a terminal 9a of a vehicle flashing device 9.

7 is a current coil, one end of the current coil 7 is connected to a terminal 9a via a normally open relay contact 10, and the other end is connected to a terminal 9b.

11 is a first transistor, the emitter of transistor 11 is connected to terminal 9a, and the collector is connected to resistor 12.13.
It is grounded through.

A capacitor and a resistor 14 and 15 are connected in parallel between the emitter and base of the transistor 11, respectively, and are used to stabilize the ON/OFF operation of the transistor 11.

A second transistor 16 amplifies the output of the first transistor, and the emitter of the transistor 16 is grounded.
The collector is connected to the terminal 9a via the voltage coil 10a of the relay, and the base is connected to the connection point between the resistors 12 and 13.

5 is a charging/discharging circuit consisting of resistors 1 and 2, a normally open reed switch 3, and a capacitor 4.

One end of the resistor 1 is connected to the terminal 9b, the other end is connected to the collector of the transistor 16 via the capacitor 4 and the resistor 17, and the series circuit consisting of the resistor 2 and the reed switch 3 is connected in parallel to the resistor 1. It is connected.

Further, the connection point between the resistor 1 and the capacitor 4 is connected to the base of the transistor 110.

18 is a direction indicator switch, 19 is a plurality of direction indicator lights whose one end is grounded, and the direction indicator light 19 is connected to the terminal 9b of the vehicle flashing device 9 via the direction indicator switch 18. There is.

Reference numeral 20 denotes an indicator light connected in parallel with the direction indicator light 19. The indicator light 20 is attached to the front of the driver's seat, etc., and is designed to indicate the blinking of the direction indicator light.

In addition, in FIG. 2, only one system of the left and right direction indicator lights is illustrated, and the other system configured symmetrically thereto is omitted.

Figure 3 shows the relay contact 10 and voltage coil 10a in Figure 2.
Relay 21. FIG. 3 is a diagram showing a specific configuration of a reed switch 3 around which a current coil 7 is wound.

In FIG. 3, a reed switch 3 around which a current coil 7 is wound is attached to a coil bobbin 21a around which a voltage coil 10a is wound, and leakage magnetic flux from the voltage coil 10a and magnetic flux from the current coil 7 are transferred to the reed switch 3. It is designed to work.

The magnetic flux of the voltage coil 10a is larger than the magnetic flux of the current coil 7, and each magnetic flux is set in a direction that cancels each other out.Furthermore, if one of the plurality of lights is disconnected, the voltage coil 10a The reed switch 3 is set to open in response to the combined magnetic flux of the current coil 7 and the current coil 7.

Next, the operation and effects of the vehicle flashing device configured as described above will be explained.

Now, when the direction indicating switch 18 is turned on in the state shown in FIG. Become.

Then, the resistor 12 .
A current flows through resistor 13, and a potential difference generated across resistor 13 is applied between the base and emitter of second transistor 16, turning transistor 16 on.

Furthermore, when the transistor 16 is turned on, the Lew coil 10
a is excited, and the Lu contact 10 is closed by the magnetic flux.

The above operation is performed instantaneously, and when the relay contact 10 is closed, current flows from the battery 8 through the relay contact 10, the current coil, and the direction indicator switch 18 to the direction indicator light 19 and indicator light, and each light device lights up. .

Then, the terminal 9b becomes the anode potential of the battery 8, and the base current of the transistor 11 flowing through the resistor 1 and the terminal 9b is cut off. It continues to flow through the collector and emitter of transistor 16.

Therefore, the base current of transistor 11 continues to flow while capacitor 4 is charged, transistors 11 and 16 are both turned on, and turn signal lamp 19 and indicator lamp 20 are turned on.
remains lit.

If all the direction indicator lights 19 are normal, a specified current flows through the current coil 7, the magnetic flux generated in the current coil 7 and the leakage magnetic flux from the voltage coil 10a cancel each other out, and the reed switch 3 becomes inoperable. kept open.

Further, the capacitor 4 is charged by the base current of the transistor 11 and the current flowing through the resistor 1, and the base current of the transistor 11 decreases as time passes, and after a certain period of time, the transistor 11 is turned off. Become.

When the transistor 11 is turned off, the potential difference across the resistor 13 disappears, the transistor 16 is also turned off, and furthermore, the magnetic flux of the relay coil 10a disappears.

Then, the relay contact 10 is opened and the current flowing through the direction indicator light 19 and indicator light 20 is cut off, and each lamp is turned off.

Furthermore, when the relay contact 10 is opened, the capacitor 4 is discharged through the path of the resistor 15, the voltage coil 10a, and the resistor 17, and this discharge current creates a potential difference between the base and emitter of the transistor 11. Applied as a reverse bias voltage.

Therefore, both the transistor 11 and the transistor 16 are turned off, and during this time the direction indicator light 19 and the indicator light 2
0 continues to go off.

Further, as the discharge of the capacitor 4 progresses with the passage of time, the reverse bias of the transistor 11 is gradually eliminated, and the base current of the transistor 11 finally reaches the resistor 1 and the terminal 9b.
, through the direction indicator switch 18 and the direction indicator light 19.

Then, transistor 11 and transistor 16
is turned ON, the relay contact 10 is closed in response to the magnetic flux generated in the voltage coil 10a, and the direction indicator light 19 and indicator light 20 are turned on.

Thereafter, the above-described operation is repeated, and the direction indicator light 19 and the indicator light 20 repeatedly blink at a cycle set by the time constant of the charging/discharging circuit 5.

Next, the operation when the direction indicator light 19 is disconnected will be explained.

If even one of the plurality of direction indicator lights 19 is disconnected, the current flowing through the current coil 7 decreases accordingly, and the magnetic flux generated in the current coil 7 decreases in proportion to the disconnection.

Then, the leakage magnetic flux of the voltage coil 10a and the current coil 7
The combined magnetic flux with the magnetic flux becomes large, and the reed switch 3 closes in response to this combined magnetic flux.

Therefore, in addition to the base current of the transistor 11 and the current flowing through the resistor 1, the current flowing through the resistor 2 and the reed switch 3 flows as a charging current for the capacitor 4.
The time required to charge the capacitor 4 is shorter than in normal times.

That is, the lighting time of the direction indicator light 19 and the indicator light 20 becomes shorter, and the blinking speed becomes faster in proportion to this.

As is clear from the above explanation, the disconnection detection circuit in the vehicle flashing device of the present invention detects the reed switch of the charging/discharging circuit by leakage magnetic flux of the voltage coil and magnetic flux of the current coil of the relay set in opposite directions. Since it is configured to control, there is no need to use a separate voltage coil as in conventional devices, and the configuration is simple.

In addition, in the present invention, only the current coil is wound around the reed switch, and the reed switch is installed close to the voltage coil of the relay, and the voltage coil and current coil are coaxially connected to the reed switch as in the conventional method. It is extremely easy to manufacture compared to the winding type.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a disconnection detection circuit in a conventional vehicle flashing device, Fig. 2 is a circuit diagram showing an embodiment of the present invention, and Fig. 3 is a circuit diagram showing a disconnection detection circuit in a conventional vehicle flashing device. The figure which shows the specific structure of the reed switch which wound the relay and the current coil. Explanation of symbols 1, 2, 12, 13, 15, 17...
...Resistance, 3...Reed switch, 4.14.
... Capacitor, 5 ... Charging and discharging circuit, 6
...Voltage coil, 7...Current coil,
8...Battery, Earth...Vehicle flashing device, 9a, 9b...Terminal, 10...Relay contact, 10a...Voltage coil, il, 1
6...Transistor, 18...Direction indicator switch, 19...Direction indicator light, 20...
...Indicator light, 21...Relay, 21a...
...Coil bobbin.

Claims (1)

[Scope of utility model registration request] An oscillation circuit having a charge/discharge circuit 5 in which a resistor 1 and a capacitor 4 are connected in series, and a series circuit consisting of a resistor 2 and a reed switch 3 is connected in parallel to the resistor 1,
In a vehicle flashing device that intermittently controls the current of a direction indicator light 19 by the output of an oscillation circuit, a current coil 7 connected in series with the direction indicator light 19 is wound around the reed switch 3, and the reed switch 3 is connected to the relay. 21, and the magnetic flux of the current coil 7 and the magnetic flux of the voltage coil 10a of the relay 21 are set to be in opposite directions, and the opening and closing of the reed switch 3 is controlled by both magnetic fluxes. A vehicle flashing device characterized by: