JPS5834550Y2 - beacon light - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a marker lamp which uses a battery as a power source and a xenon flash discharge tube as a light source, and which is turned off during the day and emits flashes intermittently at night.

One embodiment will be described in detail below.

3 is a power supply section consisting of battery B.

l is the sunlight valve circuit section, CDS photoconductor CDS, resistor R1
tR2tR3+R4tR5 and transistor Tr1
A Schmitt circuit is formed by tTr2 and tTr3.

2 is a DC-DC converter section, which is formed by a resistor R6, a capacitor C1tC2, a transistor Tr4, and an oscillating step-up transformer T1 diode D.

■ is the trigger circuit section, capacitor C3, resistor R7
, a glow discharge tube Ne, a trigger coil TC, and a silicon controlled rectifier scR.

3 is a flash discharge section, which is made of a xenon flash discharge tube Xe.

A series circuit of the photoconductor cds and the resistor R1 is connected to the battery B, and the base of the transistor Tr□ is connected to the connection point between the photoconductor cds and the resistor R1.

The collector of the transistor Tr1 is connected to both poles of the battery B through the resistors R2 and R3, the collector is connected to the base of the transistor Tr2 through the resistor R4, and the emitter is connected to the battery B and the transistor through the resistor R5. Connected to the workpiece of Tr2.

The collector of the transistor Tr2 is the base of the transistor Tr3, and the emitter of the old transistor Tr3 is the battery B.
The collector is connected to battery B via a series circuit of resistor R6 and capacitor C1.

The base of the transistor Tr4 is connected to the resistor 6 and the capacitor C.
1, the emitter is connected to battery B via the base winding of transformer T, and the collector is connected to battery B via the primary winding of transformer T.

A series circuit of capacitor C2, resistor R7 and capacitor C3, and a parallel circuit of discharge tube Xe are connected to the secondary winding of transformer T via diode D.

During the daytime, the light reception and illuminance of the photoconductor cds are high, and as a result, the resistance value of the photoconductor cds is small, so the transistor Tr1 is turned on and the transistors Tr2 . Tr3 is turned off, and no base current flows through the oscillation transistor Tr4, so it does not oscillate.

At night, the illuminance of light received by the photoconductor cds decreases and the resistance value of the photoconductor cds increases, so the transistor Tr1 is off and the transistors Tr2 and Tr
3 is turned on, a base current flows through the transistor Tr4, and it oscillates.

Therefore, the power supply voltage is boosted, rectified by diode D, and charged to capacitor C2.

Note that the voltage waveform induced in the secondary winding of the transformer T is
As shown in the figure, the voltage on the positive side is determined by the number of fixed casing secondary windings depending on the winding ratio between the primary side and the secondary side of the transformer T (power supply voltage x - secondary side positive side voltage).

-Next winding number However, in the reverse direction, a voltage several times as large as in the forward direction is induced, although the pulse width is small.

In a normal DC-DC converter, a voltage in the positive direction is used, but in this embodiment, a voltage in the reverse direction is used,
The voltage is rectified in the opposite direction to obtain a voltage several times the winding ratio, and the capacitor C2 is charged.

As the voltage of this capacitor C2 gradually rises, the trigger capacitor C3 is also charged through the high resistance R7, the voltage rises, and as the voltage of this capacitor C3 rises, the voltage applied to the discharge tube Ne also rises, discharging When the starting voltage is reached, the discharge tube Ne glow discharges and the current flows to the gate of the silicon controlled rectifier SCR, turning it on.

The charge on capacitor C3 is then transferred to silicon-controlled rectifier SC.
Pass between the anode and cathode of R, trigger coil TC
A high-voltage pulse is induced in the secondary side of the primary winding of the xenon flash discharge tube Xe, and the xenon flash discharge tube Xe emits a flash of light.

Conventional marker lights controlled the oscillation transistor by connecting the output transistor's output transistor of the Schmitt circuit in the sunlight valve circuit section in parallel between the base and emitter of the oscillation transistor. When not in operation, the output transistor of the Schmitt circuit must be conductive, which has the disadvantage of consuming a large amount of current (dark current) during the day.

In this embodiment, the output transistor Tr of the Schmitt circuit is
Since the transistors Tr3 and Tr4 are connected in series to the base circuit of the oscillation transistor Tr4, the transistors Tr3 and Tr4 become conductive at the same time, reducing dark current and extending the life of the power supply battery.

That is, in the conventional case, the dark current for driving the output transistor is a completely wasted current, but in the case of this embodiment, the current for driving the transistor Tr3 is the base current of the transistor Tr4, and is effectively consumed. Ru.

In addition, since a glow discharge tube Ne and a silicon-controlled rectifier SCR are used as trigger elements, the service life is longer than in the conventional case where an arc discharge tube is used.Furthermore, due to the constant voltage characteristics of the glow discharge tube, the rectifier It also protects the rectifier SCH from overvoltage.

Furthermore, since a xenon flash discharge tube Xe is used as a light source, power consumption is low and high intensity and bright light can be produced.

Furthermore, as shown in Figure 2, the secondary voltage of the DC-DCC comparator part 2 uses the induced voltage in the normal reverse direction, so a voltage several times higher than in the forward direction can be obtained, making the transformer smaller and lighter. Become.

As described above, the present invention uses a battery as a power source, a flash discharge tube as a light source, and is composed of a sunlight valve circuit, a DC-DC converter circuit, and a trigger circuit, and the final stage transistor of the Schmitt circuit used in the sunlight valve circuit. It is connected in series to the base circuit of the oscillation transistor, a capacitor for rectifying and charging the back electromotive force of the secondary winding is inserted in the converter circuit, and a glow discharge tube and a silicon-controlled rectifier are used in the trigger circuit. As a result, the life of the power supply battery and trigger element is extended, and the luminous intensity and brightness of the light source are increased, which is of practical value.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is an AC voltage waveform diagram induced on the secondary side of a DC-DC converter. B...Battery, Xe...Xenon flash discharge tube, l...Tako valve circuit section, ■...DC
-DC converter section, ■...Trigger circuit section,
Ne...Glow discharge tube, SCR...Silicon controlled rectifier.

Claims (1)

[Scope of utility model registration request] It uses a battery as a power source, a flash discharge tube as a light source, and is composed of a Nikko valve circuit, a DC-DC converter circuit section, and a trigger circuit, and the last stage transistor of the Schmitt circuit used in the Nikko valve circuit is used as the base circuit of the oscillation transistor. A marker light is connected in series to the converter circuit, a capacitor for rectifying and charging the back electromotive force of the secondary winding is inserted in the converter circuit, and a glow discharge tube and a silicon controlled rectifier are used in the trigger circuit.