JP3265489B2 - Airport lighting power supply control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device for an airport light, and more particularly, to a constant voltage output using a current path of the light to be supplied to another electric load requiring a constant voltage power supply. The present invention relates to a technique suitable for a supply system.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional power supply circuit for airport lighting. In the figure, a plurality of illumination transformers LT are connected to power supply conducting lines a and b connected to the constant current power supply circuit 1.
, LTn are connected in series, and the illumination transformers LT1, LT2,..., LTn are connected to the illumination lamp L such as a centerline lamp disposed on a runway or a taxiway, for example.
1, L2,..., Ln are connected. Further, a conduction angle control circuit 2 for controlling a conduction angle of an alternating current supplied from the constant current source circuit 1 is provided.

In order to change the brightness (illuminance) of the illuminating lamps L1, L2,..., Ln according to the surrounding brightness such as day or night, as shown in FIG. The alternating current having a sine wave waveform shown by the dotted line generated by the conduction angle control circuit 2 is applied to the conduction angles φ ₁ , φ ₂ ,.
..., by setting the phi _m, it is conduction angle controlled current supplied electric conductors a, the b. In this case, the illumination lamps L1, L2,.
.., The brightness of Ln decreases as the conduction angle becomes φ ₁ → φ _m . In FIG. 4, there is shown a current waveform when the conduction angle phi ₁ in solid lines.

[0004] As described above, in the power supply system for the lighting in the airport, all the lightings are made to have the same brightness by using the constant current source, and the current conduction angle control is performed in accordance with the surrounding brightness. The brightness of the lighting can be changed.

[0005]

In recent years, due to an increase in the number of departing and arriving aircraft, it has been determined whether or not an aircraft is present near a runway or a taxiway provided with an illuminating light during taxiing of the aircraft. A need has arisen for a system that is provided with a sensor for detecting the output of the control tower and transmits the output information of the sensor to a control tower or the like. In this case, a constant voltage power supply is required as a power supply for these sensors and the transmission means. For this reason, it has been considered to take out this constant voltage output from the current paths a and b of the lighting lamp.

FIG. 5 shows a circuit configuration of a power supply system for extracting a constant voltage output from a power supply circuit of an illumination lamp. still,
In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals. In this circuit, the lighting lines L1, L2,.
For example, k saturation transformers ST1, ST2,... for extracting a constant output voltage from the n conducting lines a, b.
STk in series, and each of the saturation transformers ST1, ST
, STk are connected to electric loads RL1, RL2,... RLk each requiring a constant-voltage power supply. As shown in FIG. 6, the saturation transformer ST1 includes an illumination transformer LT similar to an illumination transformer for supplying current to an illumination lamp, and a saturation transformer ST having a resonance capacitor C.
And a saturation transformer S via an illumination transformer LT.
A voltage is supplied from T to the electric load RL1. .., STk have the same configuration.

Here, the output characteristic of the AC output voltage of the saturation transformer ST with respect to the current (effective value) flowing through the conducting lines a and b is as shown in FIG. That is, it can be seen that the rate of change of the output voltage decreases as the input current increases, and that the output voltage saturates and becomes substantially constant when the input current increases to some extent. For this reason, in the lighting lamp power supply circuit configured to change the brightness of the lighting lamps L1, L2,..., Ln by the conduction angle control, a saturation transformer circuit ST1, ST2, using such a saturation transformer is used. ..., ST
If k is simply connected as shown in FIG. 5 to take out a constant voltage, when the amount of current supplied to the conducting lines a and b is reduced by the conduction angle control, the saturation transformer circuit accompanies the change in the amount of current. There is a possibility that the output voltages of ST1, ST2,..., STk fluctuate.

The present invention has been made in view of the above circumstances, and can change the brightness of an illuminating lamp.
An object of the present invention is to provide a power supply control device for an airport lighting that can stably supply a voltage to an electric load that requires a constant voltage power supply.

[0009]

For this reason, in the power supply control device for an airport lighting device according to the present invention, a plurality of lighting transformers connected in series to a conducting line connected to a constant current power supply circuit, and each of these lighting transformers are connected. A plurality of illuminating lamps each of which is supplied with power, a conduction angle control circuit that sets an amount of supply current by controlling a conduction angle of an alternating current supplied from the constant current power supply circuit to a conduction line, and is connected in series with the illumination transformer. A constant voltage extraction circuit interposed in the current supply line, an electric load using the constant voltage extraction circuit as a constant voltage power supply, and an electric load connected in parallel to the plurality of lighting transformers. And a switch circuit for conducting / cutting off the current path. The conduction angle control circuit controls the output current conduction angle of the constant current power supply circuit to be fixed and ON / OFF of the switch circuit.
Is configured to control the conduction angle according to the set illuminance of the illumination lamp.

[0010]

In this configuration, the output current from the constant current power supply circuit is always controlled at a constant conduction angle by the conduction angle control circuit, so that a constant current is always supplied to the constant voltage extraction circuit, and a constant voltage is output. Can be extracted. On the other hand, the switch circuit is turned on / off by the conduction angle control circuit at a conduction angle corresponding to the set illuminance of the illumination lamp, and the switch circuit is turned on.
During this period, the lighting transformers connected in series to the energizing lines are short-circuited and no current flows.

Therefore, the output voltage from the constant voltage extracting circuit is stabilized, and the power supply to the illuminating lamp can be changed, and the brightness can be changed.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a circuit configuration of the present embodiment. The same parts as those in the related art are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, current-carrying lines a and b connected to the constant-current power supply circuit 1
A plurality of lighting transformers LT1, LT2,..., LTn are connected in series, and these lighting transformers LT1, LT2,.
.., Ln are connected to illumination lights L1, L2,..., Ln. Further, saturation transformers ST1, ST2,..., STk as constant voltage extracting circuits for extracting a constant voltage output voltage from the conducting lines a, b are provided in series, and the respective electric loads RL1, RL2,. ., RLk are connected. The above configuration is the same as the conventional one.

In the power supply circuit of the illumination lamp, the illumination transformers LT1, LT2,.
An energizing line c is connected between the terminals X and Y in parallel with the series circuit of LTn, and a switching circuit 3 constituted by, for example, a thyristor or a bidirectional thyristor is interposed on the energizing line c. The conduction angle control circuit 2 'triggers the constant current power supply circuit 1 and the switch circuit 3, and synchronizes the conduction angle of the current output of the constant current power supply circuit 1 in synchronization with the AC power supply with a saturation transformer as a constant voltage extraction circuit. Circuits ST1, ST2,.
, STk a predetermined constant value at which each of the saturation transformers ST can saturate, for example, in this embodiment, the illumination lamps L1, L2,.
Controlling the conduction angle phi ₁ corresponding to the maximum current amount of ln. Further, the ON / OFF of the switch circuit 3 is determined by the illumination lamps L1, L
2,..., Ln, the conduction angle is controlled in accordance with the set illuminance. The output current of the constant current power supply circuit 1 can control the conduction angle at the start of energization by using a thyristor or the like, for example, similarly to the switch circuit 3.

Next, the operation of the power supply control device of this embodiment will be described with reference to the time chart of FIG. Output current of the constant current power supply circuit 1 is the conduction angle control by the conduction angle control circuit 2 ', lamp L1, L2, · · ·, the output current I _S of the conduction angle phi ₁ corresponding to the maximum illumination intensity of Ln is always Is output. On the other hand, when the switch circuit 3 is triggered by the conduction angle φ _i by the conduction angle control circuit 2 ′ to turn on and the conduction line c becomes conductive, the terminals X and Y are short-circuited, and during the period from the conduction angle φ _i to π, , a current I flows through the current supply line c, lighting transformer LT1, LT2, · · ·, current I _L to LTn does not flow.

That is, in the half cycle of the AC power supply, as shown by the solid line in FIG. 2, the conduction angle φ is always applied to the saturation transformers ST1, ST2,..., STk regardless of ON / OFF of the switch circuit 3. period from ₁ to [pi, although the current I _S is supplied, the lighting transformer LT1, LT2, · · ·, LT
The n, because the short circuit period by energizing line c is shorted current I _L is not supplied (flows to all current-carrying wires c side as a current I), as indicated by the solid line in FIG. 2, the conduction angle phi ₁ The current _IL is supplied only during the period from to _i .

When setting the illumination lamps L1, L2,..., Ln to the maximum illuminance, the switch circuit 3 may be turned off without triggering. Thus, lighting transformer LT1, LT2, · · ·, the LTn, saturated transformer circuit ST1, ST2, · · ·, the maximum amount of current from the same conduction angle phi ₁ and STk until π is supplied. Therefore, in this embodiment, the saturation transformers ST1, ST2,.
k, a constant current can always be supplied, and a stable constant voltage output is generated to generate electric loads RL1, RL2,.
Can be supplied. In addition, the lighting transformers LT1, LT2,.
.., LTn can variably control the conduction angle φ _i that triggers the switch circuit 3 to change the short-circuit period of the conducting line c, so that the amount of current to be supplied can be variably controlled.
,..., Ln can be set arbitrarily.

[0017]

As described above, according to the present invention, the constant current power supply circuit always supplies the maximum output corresponding to the maximum illuminance of the illuminator, and when the illuminance of the illuminator is made darker than this, Since only the series circuit of the lighting transformer is short-circuited within the predetermined conduction angle range to prevent the current from flowing, a stable constant voltage can be supplied to the electrical load that requires a constant voltage power supply, and the brightness of the lighting lamp can be improved. It can be arbitrarily set variably.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a power supply control device for an airport lighting according to the present invention.

FIG. 2 is a time chart for explaining a power supply state of the embodiment.

FIG. 3 is a circuit diagram showing a conventional power supply control device for airport lighting.

FIG. 4 is a time chart for explaining a power supply conduction angle control operation of the conventional device.

FIG. 5 is a circuit diagram in a case where an electric load requiring a constant voltage power supply is connected to a conventional power supply control device.

6 is a configuration diagram of a saturation transformer provided in the circuit of FIG.

FIG. 7 is a diagram showing output characteristics of a saturation transformer provided in the saturation transformer;

[Explanation of symbols]

1 Constant current power supply circuit 2 'Conduction angle control circuit 3 Switch circuit L1, L2, ..., Ln Illumination lamp LT1, LT2, ..., LTn Illumination transformer a, b, c Conducting line ST1, ST2, ... , STk Saturation transformer circuit (constant voltage extraction circuit) RL1, RL2,.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02J 3/10 H05B 37/02

Claims (1)

(57) [Claims] 1. A plurality of lighting transformers connected in series to a conducting line connected to a constant current power supply circuit, a plurality of lighting lamps each of which is supplied with power through each of the lighting transformers, and a conducting line from the constant current power supply circuit. A conduction angle control circuit for controlling a conduction angle of an alternating current supplied to the lighting transformer to set a supply current amount; a constant voltage extraction circuit interposed in the current line so as to be connected in series with the lighting transformer; An electric load using a circuit as a constant voltage power supply; and a switch circuit interposed in an energizing path connected in parallel to the plurality of lighting transformers to conduct and cut off the energizing path. Thus, the conduction angle of the output current of the constant current power supply circuit is fixedly controlled to be constant, and the O
A power supply control device for an airport lighting device, wherein N / OFF is controlled according to a set illuminance of the lighting light.