JPH0116227Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a blinking circuit for blinking a load such as a lamp.

Conventionally, as this type of blinking circuit, for example, the first
There is a circuit shown in the figure. FIG. 1 will be explained below.

B is a DC power source such as a battery, SW is a power switch, Y is a relay, and has a normally closed contact y. L
is a load such as a lamp, and R and C are a resistor and a capacitor that constitute a charging/discharging circuit.

When the power switch SW is closed now, a current flows to the load L through the contact y, and the light is turned on. On the other hand, capacitor C is charged via resistor R, and after a time constant between resistor R and capacitor C, relay Y is energized. Therefore, the contact y is opened, the current supply to the load L is cut off, and the load L is turned off. When contact y is opened, the charge in capacitor C is discharged through relay Y, so the discharge current causes relay Y to
remains energized for a certain period of time. When the discharge ends, the relay Y is demagnetized, the contact y is closed again, and the load L is energized and turned on. Thereafter, the above operation is repeated.

By the way, the circuit described above requires at least two contacts (or reed relay contacts) for the power switch SW and relay Y, and has drawbacks such as the reliability of each contact must be guaranteed. It was hot.

The present invention was developed in view of the above points, and its purpose is to provide a flashing circuit that can ensure reliability and simplify the mechanism by using only a reed switch as the contact part. is to provide.

Next, an embodiment of the present invention will be described with reference to FIG.

Note that the same reference numerals as in FIG. 1 indicate the same parts, and explanations thereof will be omitted.

S is the reed switch, Ci is the excitation coil,
When excited by the discharge current generated by the resistor R and the capacitor C, it acts in a direction to cancel the magnetic flux of the magnet M, which will be described later, and opens the reed switch S.
M is made of a magnet, and actually moves up and down in conjunction with, for example, a float for detecting the liquid level, or moves in conjunction with an operating lever for direction indication in a vehicle, and approaches and separates from the reed switch S.

Next, to explain the operation based on the above configuration,
Now, when the magnet M is in a position away from the reed switch S, that is, the liquid level is sufficiently high, or in a position where direction indicating operation is not performed,
Reed switch S is open. Therefore, the circuit does not operate and the load L is in the off state.

Next, when the magnet M approaches the reed switch S, that is, the liquid level drops, or a direction indicating operation is performed, the reed switch S is closed by the magnetic flux of the magnet M. Therefore, the load L is energized and turned on. On the other hand, the capacitor C is charged via the resistor R, and the exciting ampere turn of the reed switch S by the excitation coil Ci is connected to the magnet M.
The load L is charged and continues to be energized until the magnetic force of the load L is canceled out. When the exciting ampere turn of the excitation coil Ci cancels out the magnetic force of the magnet M, the reed switch S is opened, and therefore the current supply to the load L is cut off. Also, since the capacitor C starts discharging at the same time as the reed switch S is opened, the excitation coil Ci
Since current continues to flow through the reed switch S, the reed switch S remains open. Then, the ampere turns of the excitation coil Ci decreases, and when the magnetic force of the magnet M recovers again to a level sufficient to close the reed switch S, the reed switch S is closed and the load L
is energized and lit.

Thereafter, the above operation is repeated, and the load L performs a blinking operation.

In the above-described operation, the strength of the magnetic flux changes as the position of the magnet M relative to the reed switch S changes, so the blinking cycle changes depending on the position of the magnet M.

As described above, the present invention provides an excitation coil in a reed switch that is opened and closed by the movement of a magnet, and energizing the excitation coil cancels the magnetic flux of the magnet, releases the reed load, and energizes the load. By blocking the
The contact part is one reed switch, which improves reliability compared to the conventional one that uses two switches, and the structure is simple and can be manufactured at low cost.
Since the strength of the magnetic flux changes as the position of the magnet relative to the reed switch changes, it is possible to change the blinking period depending on the position of the magnet.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of a conventional flashing circuit.
FIG. 2 is a circuit diagram showing an embodiment of the blinking circuit according to the present invention. B...power supply, S...reed switch, M...magnet, L...load, R...resistance, C...capacitor, Ci...excitation coil.

Claims (1)

[Scope of utility model registration request] A power source, a magnetically sensitive element such as a reed switch connected in series to the power source, a load such as a lamp, and an externally operated displacement such as a float for liquid level detection or a control lever for direction indication, to the magnetically sensitive element. A nearby magnet, a charging/discharging circuit connected to a connection point between the magnetic sensing element and the load, and a charging/discharging circuit placed close to the magnetic sensing element and excited by the discharging current of the charging/discharging circuit, to increase the magnetic flux of the magnet. A flashing circuit characterized by comprising an excitation coil that cancels the magnetic field to open the magnetic sensing element.