Control circuit for power distribution of lighting system

Abstract

The utility model discloses a control circuit for power distribution of a lighting system. The control circuit comprises a control switch QF2, a time-delay disconnection normally-closed contact of a time relay KT, a first branch circuit, a normally-open contact of a main contactor KM, a second branch circuit, a normally-open contact of a first relay KA and a coil of the time relay KT. The first start button SB1 is connected in series with a coil of the main contactor KM to form a first branch, and two ends of the first start button SB1 are connected in parallel with a normally open contact of the main contactor KM; a second start button SB2 is connected with a coil of the first relay KA in series to form a second branch, the two ends of the second start button SB2 are connected with a normally open contact of the first relay KA in parallel, and the two ends of the coil of the first relay KA are connected with a coil of a time relay KT in parallel; the first branch circuit and the second branch circuit are connected in parallel and then are connected in series with a time-delay disconnection normally-closed contact of the time relay KT and the control switch QF2 to form a closed loop.

Description

Technical Field:

[0001] The utility model relates to the technical field of lighting equipment, and particularly relates to a control circuit for power distribution of a lighting system. Background Art:

[0002] A lighting system usually uses one switch to control multiple lighting lamps. At present, most lighting systems in production workshops adopt manual control or centralized control in the background, which has many disadvantages. When manually controlling the lighting system to stop lighting, the switch is set in the middle or the innermost part of the workshop. After the lighting system is powered off, personnel must come out in the dark, which is prone to safety accidents; when using centralized control in the background to stop lighting the lighting system, generally, the personnel who cut off the power in the centralized control and the workshop staff are not the same person. There is often a situation where the workshop staff has left the workshop, but the personnel who cut off the power in the centralized control cannot turn off the power in time, resulting in waste of electric power resources. Content of the Utility Model:

[0003] The purpose of the utility model is to provide a control circuit for power distribution of a lighting system.

[0004] The purpose of the utility model is implemented by the following technical solution: A control circuit for power distribution of a lighting system, which includes a control switch QF2, a normally closed delay-off contact of a time relay KT, a first branch, a normally open contact of a main contactor KM, a second branch, a normally open contact of a first relay KA, and a time relay KT coil;

[0005] A first start button SB1 and a main contactor KM coil are connected in series to form the first branch, and a normally open contact of the main contactor KM is connected in parallel at both ends of the first start button SB1;

[0006] A second start button SB2 and a first relay KA coil are connected in series to form the second branch, a normally open contact of the first relay KA is connected in parallel at both ends of the second start button SB2, and a time relay KT coil is connected in parallel at both ends of the first relay KA coil;

[0007] After the first branch and the second branch are connected in parallel, they are connected in series with the normally closed delay-off contact of the time relay KT and the control switch QF2 to form a closed loop.

[0008] Preferably, it further includes a normally closed contact of a thermal relay FR, and the normally closed contact of the thermal relay FR is connected in series between the control switch QF2 and the normally closed delay-off contact of the time relay KT.

[0009] Advantages of the present utility model: The present utility model is provided with a first start button SB1, a main contactor KM, a second start button SB2, a first relay KA, and a time relay KT. By pressing the first start button SB1, the main contactor KM is energized and self-locked, controlling all the lighting systems in the main circuit to light up for lighting. By pressing the second start button SB2, the first relay KA is energized and self-locked, connecting the time relay KT. After the time relay KT times, when the set time sufficient for the staff to leave the factory building is reached, the entire control circuit is cut off, achieving the purpose of automatically controlling the lighting system to stop lighting. Description of the drawings:

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 is the circuit schematic diagram of the present utility model.

[0012] Figure 2 is the circuit schematic diagram of the main circuit controlled by the present utility model.

[0013] The markings of each component in the drawings are as follows: control switch QF2, thermal relay FR, first branch 1, first start button SB1, main contactor KM, second branch 2, second start button SB2, first relay KA, time relay KT, main switch QF1, first lighting lamp HL1, second lighting lamp HL2, third lighting lamp HL3. Detailed implementation manners:

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0015] As Figure 1 - Figure 2 shown, a control circuit for lighting system power distribution includes a control switch QF2, a normally closed contact of a thermal relay FR, a normally closed contact with delayed disconnection of a time relay KT, a first branch 1, a normally open contact of a main contactor KM, a second branch 2, a normally open contact of a first relay KA, and a time relay KT coil;

[0016] The first start button SB1 and the main contactor KM coil are connected in series to form the first branch 1. A normally open contact of the main contactor KM is connected in parallel across the two ends of the first start button SB1.

[0017] The second start button SB2 and the first relay KA coil are connected in series to form the second branch 2. A normally open contact of the first relay KA is connected in parallel across the two ends of the second start button SB2. A time relay KT coil is connected in parallel across the two ends of the first relay KA coil.

[0018] After the first branch 1 and the second branch 2 are connected in parallel, they are connected in series with the normally closed delay-off contact of the time relay KT, the normally closed contact of the thermal relay FR, and the control switch QF2 to form a closed loop.

[0019] The main circuit controlled by the present utility model is of an existing structure, which includes a main switch QF1, a normally open contact of the main contactor KM, a thermal relay FR coil, and a lighting system. The three-phase power supply line is sequentially connected in series to the main switch QF1, the normally open contact of the main contactor KM, and the thermal relay FR coil, and then connected to the lighting system to form the main circuit controlled by the present utility model. Among them, the lighting system includes a first lighting lamp HL1, a second lighting lamp HL2, and a third lighting lamp HL3.

[0020] Working process: After closing the main switch QF1 and the control switch QF2, press the first start button SB1. The main contactor KM coil in the first branch 1 is instantaneously energized and attracted to drive the normally open contact of the main contactor KM to close, forming self-locking. The normally open contact of the main contactor KM in the main circuit closes, and the first lighting lamp HL1, the second lighting lamp HL2, and the third lighting lamp HL3 all light up for lighting.

[0021] Before the factory building staff leave the factory building, press the second start button SB2. The first relay KA coil in the second branch 2 is instantaneously energized and attracted to drive the normally open contact of the first relay KA to close, forming self-locking. The time relay KT coil is energized and starts timing.

[0022] Set a time long enough for the factory building staff to leave the factory building through the time relay KT. When the time relay KT coil reaches the set time, the normally closed delay-off contact of the time relay KT disconnects, cutting off the entire control circuit. The main contactor KM coil, the first relay KA coil, and the time relay KT coil all lose power, and the lighting system goes out completely.

[0023] The above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A control circuit for power distribution of a lighting system, characterized in that, It includes a control switch QF2, a normally closed contact of a time relay KT that is delayed to open, a first branch, a normally open contact of a main contactor KM, a second branch, a normally open contact of a first relay KA, and a time relay KT coil; A first start button SB1 and a main contactor KM coil are connected in series to form the first branch, and a normally open contact of the main contactor KM is connected in parallel across the two ends of the first start button SB1; A second start button SB2 and a first relay KA coil are connected in series to form the second branch, a normally open contact of the first relay KA is connected in parallel across the two ends of the second start button SB2, and a time relay KT coil is connected in parallel across the two ends of the first relay KA coil; After the first branch and the second branch are connected in parallel, they are connected in series with the normally closed contact of the time relay KT that is delayed to open and the control switch QF2 to form a closed loop.

2. The control circuit for power distribution of a lighting system according to claim 1, characterized in that, It further includes a normally closed contact of a thermal relay FR, and the normally closed contact of the thermal relay FR is connected in series between the control switch QF2 and the normally closed contact of the time relay KT that is delayed to open.

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