JPS5952479B2 - 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 using a guide light, etc., and more particularly to a flashing notification device that facilitates switching of luminous intensity, reduces voltage fluctuations in a power supply, and maintains a constant luminous intensity.

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 directly connected to the xenon lamp 8, and the second capacitor 7 is connected to the xenon lamp 8 via the backflow blocking diode 9, so that during the night when the first capacitor 4 is being 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 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.

By the way, since the luminous intensity of the lamp 8 must be changed by the switch 5 connected to the power supply line, the device not only becomes larger but also has lower reliability.

In addition, in the device shown in Fig. 1, the capacitor 4 or 7 is charged with the output of the rectifier 2, so when charging starts, as shown in Fig. 2B, a current flows rapidly, and then the charging current gradually decreases. .

Therefore, voltage fluctuations occur in the circuit of the AC power supply 1.

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

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flash light notification device that facilitates switching of luminous intensity, reduces voltage fluctuations in the power supply, and makes it possible 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 capacitor coupled to the lamp so as to light the lamp with a discharge current, and a capacitor that charges the capacitor with a constant current. The capacitor is connected between the capacitor and the rectifier for the DC power source, and is configured to perform constant voltage charging after the lamp is charged, and is configured to change the voltage value of the constant voltage charging in order to change the luminous intensity of the lamp, and is connected between the capacitor and the rectifier for DC power supply. The lamp is characterized by comprising a constant current constant voltage control circuit, which causes the lamp to flash intermittently at multiple levels of luminous intensity.

According to the present invention, since the luminous intensity is switched by voltage switching in the constant current/constant voltage control circuit, the switching mechanism is not only simplified but also improved in reliability.

Further, since the lamp lighting capacitor is first charged with a constant current and then charged with a constant voltage, a capacitor charging current 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.

The constant current/constant voltage control circuit 28 is configured so that the output voltage changes in response to the luminous intensity switching.

A reverse current blocking diode 14 is provided in the constant current constant voltage control circuit 13.
The light emitting capacitor 15 connected via the light emitting 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 the light emitting capacitor 15.

Although a capacitor 15 of approximately 6 μF is used in FIG. 3, a desired capacitance may be obtained by combining a plurality of capacitors.

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 time period for which the constant current (2) is supplied from the constant current/constant voltage control circuit 13 is set to be long as shown in FIG. 4B, and the voltage for constant voltage charging is set to a high voltage of, for example, about 3700V.

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

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

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

As the constant current ■2 continues to be supplied, the charging voltage of the capacitor 15 gradually increases until the desired charging voltage (final charging voltage) is reached.
The voltage becomes 1 which is close to V2.

Therefore, a time point t2 at which the voltage becomes 1 is detected or set, and from this 12 time point on, the constant current constant voltage control circuit 13 supplies the constant voltage 2 to the capacitor 15.

If constant voltage ■2 is supplied from time point 12, capacitor 15
A charging current flows until the voltage reaches a constant voltage (■2), and after that, no charging current flows.

In this embodiment, the time 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 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 .

Although the ratio between the constant current charging period and the constant voltage charging period may be changed appropriately, it is possible to make the constant voltage charging period from P2 to P3 173 or less of the constant current charging period from P□ to P2. Desirable to suppress peak current.

The fact that a charging current flows through the capacitor 15 as shown in FIG. 4B means that the current and voltage of the capacitor 15 are
This means that it changes approximately as shown in the figure.

That is, when constant current I2 is supplied, the voltage gradually rises from point P1 and reaches voltage 1 at point 22.

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 of t2 from tl using a timer such as a monostable multivibrator, and It may be determined at the end of the period.

When the xenon lamp 16 is turned on at time t3, the capacitor 15 charged to v2 is rapidly discharged, a flash of light is emitted from the lamp 16, and the charge and voltage of the capacitor 15 become substantially zero. .

The capacitor 15 is then charged again and the lamp 1
6 is also lit again after period T, and the intermittent flashing indicates an obstacle or route.

When it becomes nighttime after time 14, there is no problem in lowering the luminous intensity of the lamp 16, so the voltage setting of the constant current constant voltage control circuit 13 is switched by automatic control by the light receiving element or manual control.

That is, the settings are changed so that the capacitor 15 is charged to a lower voltage than before t4.

In the examples shown in FIGS. 4 and 5, the current setting is not changed, so the capacitor 15 is charged with a constant current of current 2, and from the time when the voltage becomes 3, it is charged with a constant current of voltage v4.

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

The voltage of the capacitor 15 eventually becomes, for example, 1600V, and the lamp 16 generates flash light based on this voltage.

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 capacitor 15 progresses, and the capacitor voltage gradually increases.

Further, in order to maintain a constant current, the voltage supplied to the capacitor 15 also gradually increases.

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.

A voltage setting changeover switch is provided in the control circuit 28, and as described above, the capacitor voltage is lowered at night.

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

The current detection signal obtained by the current detection resistor 27 in FIG. 6 is inputted to one input terminal of the error amplifier 32 through the 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.

The output of the error amplifier 32 is coupled to the base of the transistor 23 shown in FIG. 6 via the switch 34, so that the I transistor 23 supplies a constant current while the switch 34 is on (constant current charging period). controlled by.

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 is input.

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.

A resistor 41 and a voltage setting switch 42 provided in the reference power source 38 are provided to lower the voltage of the reference power source 38 during the night mode.

Further, a resistor 43 and a voltage setting changeover switch 44 provided in the switching point detection circuit 37 are used to set a voltage that determines the switching point in the night mode.

Now, at night, switch 42 and 44 are automatically or manually turned on.
When turned on, the capacitor 15 becomes P'1. in FIG. P
'2. It is charged according to the characteristic curve indicated by P'3.

That is, in this case, since the constant current setting value has not been changed, constant current charging is performed from P'1 to P'2 at current 2.

As a result, when the capacitor voltage reaches V3, the switching point detection circuit 37 is set to turn on the switch 44 and detect the point ■3, so when it reaches V3, it generates a high level output and switches 34 is off, switch 39
is turned on.

On the other hand, the error amplifier 36 generates an error output between the reference voltage and the detection voltage determined by turning on the switch 42, and controls the transistor 23 so that the output voltage becomes 4.

As is clear from FIG. 5, the output voltage V4 is a voltage lower than (2).

When the capacitor 15 is charged with a constant current and then charged with a constant voltage 4, the capacitor voltage becomes V4.

Therefore, the lamp 16 emits a flash of light whose intensity corresponds to the voltage V4.

As is clear from the above, according to this embodiment, the luminous intensity can be changed by changing the constant voltage setting without changing the capacitor capacity, making it possible to simplify the device and improve its reliability. .

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 charging voltage constant and the luminous intensity of light emission to be 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 C0 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, a current detection current transformer CT, a rectifier Re connected to the current transformer CT, a smoothing resistor R3, a smoothing capacitor C2, and a current detection resistor R4,
It consists of a 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.

In this embodiment as well, a switch is provided in the control circuit 28' to reduce the luminous intensity of the lamp 16 at night, and the operation of this switch changes the charging voltage value of the capacitor 15.

Therefore, this embodiment can also provide the same effects as the embodiment shown in FIG.

FIG. 9 shows yet another embodiment of the invention.

In this embodiment, the control circuit 28 in FIG. 6 is modified from the circuit in FIG. 7 to the circuit in FIG. 9, and the reference power source 33 is also provided with a resistor 45 and a current setting switch 46. be.

In this device, when changing the luminous intensity of the lamp 16 shown in FIG. 6, switches 42, 44, and 46 are turned on, respectively.

As a result, the voltage value for constant voltage charging switches from ■2 to V4 as in the case of Figure 7, and the current value for constant current charging changes from <12 to 13 as shown in Figures 10 and 11. Switch.

Therefore, at night, as shown in FIG. 11, first constant current charging is performed with current I3, and then constant voltage charging is performed with voltage v4.

As a result, even at night, constant current charging is performed for a period close to the period T, so the current value can be significantly reduced, and voltage fluctuations of the AC power source 11 can be reduced.

Further, the same effects as in the embodiment row shown in FIG. 7 can also be obtained.

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 a current-voltage characteristic, that is, a drooping characteristic, as shown in FIG. You can also do this.

In this case, even if switching between constant current control and constant voltage control is not performed based on detection, points 21, P2, 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.

Also, change the settings of the constant current value and constant voltage value using the reference power supply 33.
, 38, but may be performed by switching the voltage detection resistors 25, 26 and the current detection resistor 27.

Further, in the case of a fero-resonant type constant voltage power supply device, this may be done by switching the capacitor capacity.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional flash light notification system, - Fig. 2 is a waveform diagram showing luminous intensity and charging/current in the method of Fig. 1, and Fig. 3 is a flash light alarm system according to an embodiment of the present invention. A circuit diagram showing the notification method, Fig. 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. 6 is a waveform diagram showing the luminous intensity and charging current in the method of Fig. FIG. 7 is a block diagram showing an example of the control circuit shown in FIG. 6, and FIG. 8 is a circuit showing a flash notification system according to another embodiment of the present invention. 9 is a circuit diagram showing a control circuit in still another embodiment of the present invention, FIG. 10 is a waveform diagram showing a charging current controlled by the control circuit of FIG. 9, and FIG. FIG. 3 is a characteristic diagram showing current-voltage changes of a capacitor when controlled by a control circuit of FIG. 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 capacitor, 16 is a xenon lamp, 32 is an error amplifier, 33 is a reference power supply, 36 is an error amplifier, 37 is a switching point detection circuit, 38 is a reference power supply, and 42.44 is a voltage setting changeover switch.

Claims (1)

[Scope of Claims] 1. A lamp that generates flashing light; a capacitor coupled to the lamp so as to light the lamp with a discharge current; and a structure configured to charge the capacitor with a constant current and then with a constant voltage. a constant current constant voltage control circuit configured to change the voltage value of the constant voltage charging for switching the luminous intensity of the lamp, and connected between the capacitor and a rectifier for DC power supply; 1. A flashing notification device for intermittently flashing the lamp at multiple levels of luminous intensity. 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.