JPS5952478B2 - Flash warning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an aircraft obstruction light or an airport guidance light (
The present invention relates to a flashing notification device for a guide light, etc., and more particularly to a flashing notification device that can reduce voltage fluctuations in a power source and keep the luminous intensity constant.

In order to ensure aircraft safety, aviation obstruction lights must be installed at aviation obstacles.

Conventional aircraft obstacle lights are intermittently turned on using a flashing warning system shown in FIGS. 1 and 2.

First, to describe the device shown in Figure 1, the commercial AC power supply 1
A rectifier 2 connected to converts alternating current into direct current, and charges a first capacitor 4 connected to the rectifier 2 via a current limiting resistor 10 and a reverse blocking diode 3.

Since the second capacitor 7 is also connected to the rectifier 2 via the current limiting resistor 10, the switch 5, and the diode 6, the second capacitor 7 is also charged at dusk or during the day when the switch 5 is closed. Ru.

The first capacitor 4 is connected directly to the xenon lamp 8, and the second capacitor 7 is connected to the xenon lamp 8 via a backflow blocking diode 9, so that during the night when the first capacitor 4 is charged, At dusk or during the day, when only the discharge AC of the first capacitor 4 flows to the lamp 8 and both the first capacitor 4 and the second capacitor 7 are charged, the discharge AC of both capacitors 4 and 7 flows. flows to lamp 8.

The lamp 8 has a period T of, for example, 1.5 seconds as shown in FIG. 2A.
Lights up intermittently.

This intermittent lighting control can be easily achieved by controlling a nickel wire lighting control electrode provided on the xenon lamp 8.

Dusk or daytime control is performed during the period from tl to t3, and nighttime control is performed after t3.

At dusk or during the day, the area around the lamp 8 is bright, so
Since it is necessary to increase the luminous intensity, the switch 5 is closed to charge both capacitors 4 and 7, and the discharge of both capacitors 4 and 7 lights up the lamp 8.

Since the surroundings of the lamp 8 are dark at night, the luminous intensity may be low.

Therefore, the switch 5 is opened, only the capacitor 4 is charged, and the lamp 8 is lit by discharging the capacitor 4.

Charging of the capacitors 4 and 7 starts in such a way that the lamp 8 is lit, the capacitors 4 and 7 are discharged, and the voltage becomes zero or a low voltage near zero, as shown in FIG. 2B. As shown in the figure, the process ends before the next lamp is turned on.

Incidentally, since the capacitor 4 or 7 is charged with the output of the rectifier 2, when charging starts as shown in FIG. 2B, a current flows rapidly, and thereafter, the charging AC gradually decreases.

As a result, voltage fluctuations occurred in the circuit of the AC power supply 1.

Furthermore, the light emitting circuit must be designed to withstand the peak current value ■1.

Furthermore, even when the capacitor capacity became smaller at night, the peak current value was the same as during the day, and it affected the power supply regardless of the capacitor capacity.

Constant current charging makes it possible to suppress the current peak as shown by the dotted line in FIG. 2B, but the peak value remains the same regardless of the capacitor capacity, and the effect on the power supply is also the same.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flash light notification device that makes it possible to minimize voltage fluctuations in the power supply and to obtain constant light emission characteristics.

To achieve the above object, a flashing light alarm device according to the present invention includes a lamp that generates flashing light, a plurality of capacitors coupled to the lamp so as to light the lamp with discharge alternating current, and a capacitor whose capacitance is changed. one or more capacitor capacity changeover switches provided on the input side or output side of the plurality of capacitors to change the luminous intensity of the lamp; and after some or all of the plurality of capacitors are charged with a constant current. The plurality of capacitors are configured to perform constant voltage charging, and are configured such that the current value supplied during the constant current charging changes in proportion to the capacitor capacity in response to switching of the capacitor capacity selection switch. The lamp is characterized by comprising a constant current/constant voltage control circuit connected between a rectifier for a DC power supply, and causes the lamp to intermittently flash at multiple levels of luminous intensity.

According to the present invention, since the AC charging of the capacitor is switched in response to switching of the luminous intensity of the lamp, the influence on the power supply can be reduced in accordance with the capacitance of the capacitor.

Furthermore, since the lamp lighting capacitor is first charged with a constant current and then charged with a constant voltage, a capacitor charging alternating current exceeding the constant current value set during constant current charging does not flow.

That is, a sudden large charging alternating current is prevented from flowing.

Therefore, it is possible to reduce voltage fluctuations such as voltage flicker.

In addition, instead of simply performing constant current charging, constant voltage charging is performed after charging to a predetermined voltage value, so the final capacitor charging voltage remains constant, making it possible to maintain the luminous intensity of the lamp constant. .

Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIG. 3, which shows a flashing warning device for aircraft obstacle lights or airport guidance lights according to an embodiment of the present invention, alternating current is converted into direct current by a rectifier 12 connected to a commercial alternating current power source 11.

A constant current/constant voltage control circuit 13 connected to the rectifier 12 sends out a constant current output up to a certain point based on the output of the rectifier 12, and sends out a constant voltage output from that point on.

A reverse current blocking diode 14 is provided in the constant current constant voltage control circuit 13.
The first capacitor 15 connected through the first capacitor 15 is charged based on the output of the constant current constant voltage control circuit 13, and then supplies lighting current to the xenon lamp 16 by discharging.

A second capacitor 19 connected to the constant current constant voltage control circuit 13 via a switch 17 and a reverse current blocking diode 18 is charged when the switch 17 is turned on to increase the luminous intensity of the lamp 16. Discharge occurs through the diode 20 when the lamp 16 is turned on.

The switch 17 is automatically closed by a light-receiving element or manually when the night changes from day to day, and is opened when the day changes from day to night.

In this embodiment, the current value setting changeover switch 30 provided in the constant current constant voltage control circuit 13 is switched in response to the changeover of the luminous intensity changeover switch 17.

The lighting method of the lamp 16 and the charging method of the capacitor 15, 19 in the device shown in FIG. 3 will be explained with reference to FIGS. 4 and 5.

If t1 to t4 in FIG. 4 are dusk or daytime, the area around the lamp 16 is bright, so the luminous intensity must be increased as shown in FIG. 4A.

Therefore, the switch 17 is automatically or manually closed, and the current value setting changeover switch 30 linked to the switch 17 is also closed, and both the capacitors 15 and 19 are charged.

When charging the capacitor 15.19, a constant current value I2 is supplied to the capacitor 15 during the first period from tl to t2, as is clear from FIG. 4B.

That is, constant current charging is performed during the first period.

Therefore, a large current 11 does not flow as in the conventional charging current shown by the dotted line.

If a constant current ■2 continues to be supplied, the capacitor 15.19
The charging voltage gradually increases and becomes a voltage v1 close to the desired charging voltage (final charging voltage) V2.

Therefore, a time point t2 at which the voltage becomes v1 is detected or set, and from this time point 12 onwards, a constant voltage is supplied to the capacitors 15 and 19 by the constant current constant voltage control circuit 13.

If constant voltage V2 is supplied from time point 12, capacitor 15
．． A charging current flows until the voltage of No. 19 reaches a constant voltage v2, and after that, a charging current does not flow.

In this embodiment, the time point when the charging current of the capacitor becomes zero is set immediately before the lighting time t3 of the lamp 16.

Further, the time point at which constant voltage charging is started is also set close to the time point t3 at which the lamp 16 is turned on.

That is, in twilight or daytime mode, the constant voltage charging period is made much shorter than the constant current charging period, and the lamp lighting cycle T
Constant current charging is performed for a period approximately equal to .

The ratio between the constant current charging period and the constant voltage charging period may be changed appropriately, but the peak value is to set the constant voltage charging period from P2 to P3 to 173 or less of the constant current charging period from P1 to P2. Desirable to suppress current.

The fact that a charging current flows through capacitors 15 and 19 as shown in FIG. 4B means that the current and voltage of capacitors 15 and 190 change approximately as shown in FIG.

That is, when the constant current (2) is supplied, the voltage gradually increases from the 21st point and reaches the voltage V1 at the 22nd point.

When constant voltage v2 is supplied instead of constant current supply at 22 points,
The capacitor voltage finally becomes 23 points (■2), and the current becomes zero.

The 12 points, that is, the 22 points, may be determined by detecting that the capacitor voltage has reached vl, or by setting a fixed time corresponding to the period from tl to t2 using a timer such as a monostable multivibrator, and It may be determined at the end of the period.

If the xenon lamp 16 is turned on at time t3, the capacitor 15.19 charged to v2 will be rapidly discharged,
As light is emitted from the lamp 16, the charge and voltage on the capacitor 15.19 becomes substantially zero.

Thereafter, the capacitors 15, 19 are charged again, and the lamp 16 is also turned on again after a period T, indicating an obstacle or path by intermittent flashing.

When it becomes nighttime after time t4, the light emission intensity of the lamp 16 can be lowered, so the switch 17 is opened by automatic control by the light receiving element or by manual control.

Further, the current value setting changeover switch 30 is also opened in conjunction with the switch 17.

As a result, after time t4, charging and discharging of the second capacitor 19 is not performed, and only charging and discharging of the first capacitor 15 is performed.

Charging of the first capacitor 15 is first started with a current 3 which is reduced in proportion to the capacitance.

Therefore, as shown in FIG. 4B, the peak value of the current becomes significantly smaller than before t4.

When the current I3 is passed through the capacitor 15 until near the end of the period T, the voltage of the capacitor 15 becomes 1, so at this point, the mode is switched to constant voltage charging and constant voltage charging is performed at the voltage V2.

That is, constant current charging is performed from P'1 to P'2, and constant voltage charging is performed from P'2 to P'3.

FIG. 6 specifically shows the circuit of FIG. 3.

A constant current constant voltage control circuit 13 connected to a rectifier 12 via a smoothing capacitor 21 is connected to one power supply line 2.
2, voltage detection resistors 25 and 26 connected between line 22 and line 24, and current detection resistor 27 and 29 connected in series to line 24. , a control circuit 28 that forms a signal for constant current and constant voltage control of the transistor 23 based on voltage detection and current detection, and a current setting changeover switch 30 connected in parallel to the resistor 27.

The control circuit 28 supplies a base current that operates the transistor 23 at a constant current in synchronization with the end of lighting of the lamp 16.

This constant current operation is performed by controlling the current value detected by the constant current detection resistor 27, 29 to match the reference constant current value.

As a result, constant current charging of the capacitors 15 and 19 progresses, and the capacitor voltage gradually increases.

Further, the voltage supplied to the capacitors 15 and 19 gradually increases in order to maintain a constant current.

When the voltage detected by the voltage detection resistors 25 and 26 reaches a certain value, the control is switched to constant voltage control and the transistor 2
In order to obtain a constant voltage at the output stage of transistor 2,
Control 3.

This constant voltage control is achieved by performing closed loop control so that the voltage detected by the resistors 25 and 26 matches the reference voltage.

The voltage supplied under constant voltage control is higher than the voltage at the switching point from constant current control to constant voltage control.

When the switch 30 is opened in conjunction with the switch 17 at night, the apparent current increases and the output current of the transistor 23 decreases.

Therefore, constant current charging is performed using a current (3) smaller than that during the daytime.

In other words, the current decreased in response to the reduction in capacitor capacity■3
is charged at a constant current.

FIG. 7 shows an example of the control circuit 28.

A current detection signal obtained by the current detection resistor 27 in FIG. 6 is inputted to one input terminal of the error amplifier 32 from a line 31 in FIG.

Since the reference power supply 33 is connected to the other input terminal of the error amplifier 32, the reference voltage corresponding to the constant current and the voltage corresponding to the detected current are compared and amplified, and an output of the difference is obtained.

Since the output of the error amplifier 32 is coupled to the base of the transistor 23 in FIG. 6 via the switch 34, the transistor 23 is controlled to supply a constant current while the switch 34 is on (constant current charging period). be done.

The voltage detection signal detected by the voltage detection resistors 25 and 26 in FIG. 6 is input to one input terminal of the error amplifier 32 via the line 35 in FIG.
7 will be powered by humans.

Since the reference power supply 38 is connected to the other input terminal of the error amplifier 36, the error amplifier 36 compares the reference voltage corresponding to the constant voltage applied from the reference power supply 38 with the detected voltage, and calculates the difference between the two. The output is obtained.

The output of the error amplifier 36 is coupled to the base of the transistor 23 in FIG. 6 via the switch 39, so that when the switch 39 is on, the transistor 23 is controlled to supply a constant voltage.

The switching point detection circuit 37 is a circuit that detects the point in time when the capacitor voltage, that is, the supply voltage in constant current charging, becomes a predetermined voltage value or more, and when the supply voltage becomes a predetermined voltage value or more,
It generates a high level output and controls one switch 34 to be turned off and the other switch 39 to be turned on via an inverter 40.

Therefore, one switch 34 and the other switch 39 are never turned on at the same time.

Note that the voltage for determining the switching point in the switching point detection circuit 37 is set to a value somewhat lower than the voltage during constant voltage control.

As is clear from the above, according to this embodiment, the current value is switched in response to the light intensity switching, so when the capacitor capacity is small, it is possible to significantly reduce the peak of the capacitor charging current, and the power supply The impact can be significantly improved.

Further, since constant voltage charging is performed after constant current charging, it is possible to suppress the current peak, and also to keep the capacitor voltage constant and the luminous intensity constant.

FIG. 8 shows another embodiment of the invention.

In this embodiment, a switching type constant current constant voltage control circuit 13 is provided at the output of the rectifier 12 via a smoothing circuit consisting of a capacitor C1 and a choke coil L1.

This constant current constant voltage control circuit 13 consists of four bridge-connected transistors Q1. Q2. Q3. Q4, an output transformer Tr, and four bridge-connected rectifier diodes D1. D2゜D3. D4, choke coil L2,
Voltage detection resistors R1 and R2, current detection current transformer CT, rectifier Re connected to current transformer CT, smoothing resistor R3, smoothing capacitor C2, and current detection resistors R4 and R
5, a current setting changeover switch 30, and a control circuit 28'.

The current detected based on the current transformer CT is transmitted to the control circuit 28'.
The voltage input to the control circuit 28' and detected based on the detection resistors R1 and R2 is also input to the control circuit 28'.

The control circuit 28' forms a signal that first controls the transistors Q1 to Q4 to charge the capacitor 14.15 with a constant current, and then controls the transistors Q1 to Q4 to charge the capacitor 14.15 with a constant voltage.

Specifically, a pulse forming circuit is added to the circuit shown in FIG. 7.

That is, a pulse forming circuit whose output pulse width varies depending on the output of the error amplifier 32 or 36 is provided, and the pulses obtained from this pulse forming circuit are transmitted to the transistors Q1 to Q4.
This is given as a control signal.

In this embodiment as well, since the switch 30 is switched in conjunction with the switch 17 for switching the capacitor capacity, constant current charging is performed at a low current value (3) at night.

Therefore, the same effects as the embodiment shown in FIG. 6 can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be further modified.

For example, a constant voltage power supply such as a fero-resonant type having current-voltage characteristics, that is, drooping characteristics as shown in FIG. It may be possible to switch.

In this case, even if switching between constant current control and constant voltage control is not performed based on detection, points 21, 22, and 2 in FIG.
The current and voltage change in the order of the three points, and constant current charging and constant voltage charging can be performed sequentially.

Further, the luminous intensity of the lamp 16 may be changed in three or more levels.

In addition, reverse current blocking diodes are connected in place of the switches 34 and 39 in FIG.
It may be given to the base of 3.

Further, the setting of the constant current value may be changed using the reference power source 33 instead of using the current detection resistor 27, 29 or R4, R5.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional flash notification system, Fig. 2 is a waveform diagram showing luminous intensity and charging AC in the system of Fig. 1, and Fig. 3 is a flash notification system according to an embodiment of the present invention. 4 is a waveform diagram showing the luminous intensity and charging AC in the method of FIG. 3, FIG. 5 is a current-voltage characteristic diagram of capacitor charging by the method of FIG. 3, and FIG. 7 is a block diagram showing an example of the control circuit of FIG. 6, and FIG. 8 is a circuit diagram showing a flash notification system according to another embodiment of the present invention. be. In addition, in the symbols used in the drawings, 11 is a commercial AC power supply, 12 is a rectifier, 13 is a constant current voltage control circuit, and 15 is a
1 is a first capacitor, 16 is a xenon lamp, 17 is a switch, 19 is a second capacitor, and 30 is a current setting switch.

Claims (1)

[Scope of Claims] 1. A lamp for producing flashing light; a plurality of capacitors coupled to the lamp for lighting the lamp with discharge alternating current; and for varying the luminous intensity of the lamp by varying the capacitance of the capacitor. one or more capacitor capacity changeover switches provided at the input ends or output sides of the plurality of capacitors; and a part or all of the plurality of capacitors are configured to be charged at a constant current and then charged at a constant voltage. and a capacitor connected between the plurality of capacitors and a DC power rectifier, the capacitor being connected between the plurality of capacitors and a DC power supply rectifier, and configured such that the current value supplied during the constant current charging changes in proportion to the capacitor capacitance in response to switching of the capacitor capacity selection switch. 1. A flashing notification device for intermittently flashing the lamp at a plurality of levels of luminous intensity, characterized by comprising a constant current and constant voltage control circuit. 2. The flash notification device according to claim 1, wherein the period of the constant current charging is longer than the period of the constant voltage charging. 3. The flashing light notification device according to claim 1 or 2, wherein the lamp is a xenon flashing lamp.