JPS5952477B2 - Flash notification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an aircraft obstruction light or an airport guidance light l-(
The present invention relates to a flashing notification system for guide lights, etc., and more particularly to a flashing notification system that reduces power supply voltage fluctuations and makes it possible to 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 current 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 current 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 as shown in FIG. As shown in B, the process ends before the next lamp lighting time.

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 current 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 a peak current value of 11.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flash light notification system that can reduce voltage fluctuations in the power supply and provide constant light emission characteristics.

In order to achieve the above object, the flash notification system according to the present invention starts constant current charging of the capacitor from the time when the voltage of the capacitor becomes zero voltage or low voltage, and stops the constant current charging at a certain time. Wisdom.

or after the capacitor is charged to a predetermined voltage value, constant voltage charging is started at a voltage higher than the voltage value applied during the constant current charging, and the capacitor is charged to a constant voltage value by the constant voltage charging. The present invention is characterized in that the lamp is caused to flash intermittently, including lighting the lamp by discharging the capacitor.

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

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

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

Further, 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 becomes 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 1 connected to the constant current constant voltage control circuit 13 via a switch 17 and a reverse current blocking diode 18.
9 is a switch 1 for increasing the luminous intensity of the lamp 16;
7 is turned on, and is discharged through the diode 20 when the run 1160 is turned on.

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

Now, if it is twilight or daytime from t□ to t4 in FIG. 4, the area around the lamp 16 is bright, so the luminous intensity must be increased as shown in FIG. 4A.

Therefore, switch 17 is automatically or manually closed and both capacitors 15 and 19 are charged.

When charging the capacitors 15 and 19, a constant current value (I2) is supplied to the capacitors 15 and 19 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 (I1) does not flow like the conventional charging current shown by the dotted line.

If you continue to supply a constant current (I2>), the capacitor becomes 15°1
The charging voltage of 9 gradually increases and becomes a voltage 1 close to the desired charging voltage (final charging voltage) V2.

Therefore, the time t2 at which the voltage becomes V1 is detected or set, and from this time t2, the constant current constant voltage control circuit 13 supplies a constant voltage to the capacitor 15.19.

If constant voltage v2 is supplied from time t2, capacitor 15
．． The charging current flows until the voltage of 19 reaches the constant voltage 2, and after that, the charging current does not flow.

In this embodiment, the time when the charging current of the capacitor becomes zero is determined to be 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 the twilight or daytime mode, the constant voltage charging period is significantly 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 Pl to P2. Desirable to suppress current.

The fact that the charging current flows through the capacitors 15, 19 as shown in FIG. 4B means that the current and voltage of the capacitors 15, 19 change approximately as shown in FIG. 5.

That is, when a constant current (I2) 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 v2 at point P3, and the current becomes zero.

The t2 point, 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 with 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 lamp 16, the charge and voltage on capacitors 15 and 19 become 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 route by intermittent flashing.

When it becomes nighttime after time 14, there is no problem in lowering the luminous intensity of the lamp 16, so the switch 17 is opened by automatic control by the light receiving element or by manual control.

As a result, after time 14, charging and discharging of the second capacitor 19 is not performed, and only charging and discharging of the first capacitor 15 is performed.

The first capacitor 15 is charged by constant current charging from point P1' to point P2', as in the daytime mode.
Constant voltage charging is performed from point P2' to point P3'.

In Figure 4B, even after t4, the value during constant current charging is I
Although it is kept at 2, it may be set to a lower value.

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, a voltage detection resistor 25, 26 connected between the line 22 and the line 24, a current detection resistor 27 connected in series to the line 24, It consists of a control circuit 28 that forms a signal for controlling the transistor 23 at constant current and constant voltage based on the detection and current detection.

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 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.

Furthermore, 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 controlling the voltages detected by the resistors 25 and 26 to match 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.

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

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

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 2
3 is controlled to supply a constant current.

The voltage detection signal detected by the voltage detection resistors 25 and 26 in FIG.

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

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, the 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, current detection resistor R4, control circuit 28 ′.

The current detected based on the current transformer CT is transmitted to the control circuit 28'.
The voltage 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.

The embodiment shown in FIG. 8 can also provide the same effects as the embodiment shown in FIG. 6.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned 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. 5 may be used as the constant-current constant-voltage control circuit 13.

In this case, even if switching between constant current control and constant voltage control is not performed based on detection, points 21, 22, and
The current and voltage change in the order of 23 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, or a configuration in which the luminous intensity of the lamp 16 is not changed is also applicable.

Furthermore, diodes may be connected in place of the switches 34 and 39 in FIG. 7, so that the output of the error amplifier 32 or 36 with the higher output voltage is applied to the base of the transistor 23.

[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 current 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 current 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 constant voltage control circuit, 1
5 is a first capacitor, 16 is a xenon lamp, 17 is a switch, and 19 is a second capacitor.

Claims (1)

[Claims] 1. Constant current charging of the capacitor is started from the time when the voltage of the capacitor becomes zero voltage or low voltage, and after the constant current charging is continued for a certain period of time or when the capacitor reaches a predetermined voltage value. After being charged, starting constant voltage charging with a voltage higher than the voltage applied during the constant current charging, and lighting the lamp by discharging the capacitor charged to a constant voltage value by the constant voltage charging. A flashing notification method characterized by causing a front lamp to flash intermittently. 2. The flash notification system 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 system according to claim 1 or 2, wherein the lamp is a xenon flashing lamp.