KR102430761B1 - Device for afterglow prevention - Google Patents

Abstract

An afterglow prevention device of the present invention comprises: a power input part wherein an alternating current power is inputted; a lighting output part that outputs a direct current power generated by using the alternating current power; and a relay circuit part formed between the power input part and the lighting output part, wherein the relay circuit part may be connected in series between a transformer and the lighting output part when the transformer is formed between the power input part and the lighting output part. Therefore, the present invention is capable of preventing the afterglow of the lighting caused by the transformer.

Description

Device for afterglow prevention}

The present invention relates to a device for preventing an afterglow phenomenon in which a light shines even after power supply is interrupted.

In recent years, LED technology has developed rapidly, and as a result, LED lamps have been widely spotlighted as next-generation lighting fixtures. The reason is that the LED lamp has high energy efficiency, has a longer lifespan, and has less impact on the environment than conventional lighting equipment.

In general, as commercial AC power applied from the outside is rectified into DC power and applied to the LED chip, the LED lamp is turned on.

A power supply that converts AC to DC, that is, a Switching Mode Power Supply (SMPS), is used for products using LEDs as lighting.

Korean Utility Model Publication No. 20-2015-0003463 discloses a technique for preventing afterglow through a relay connected to two power lines, respectively.

Korean Public Utility Model No. 20-2015-0003463

An object of the present invention is to provide an afterglow prevention device for preventing afterglow generated in a power supply system for lighting including a transformer.

The afterglow prevention device of the present invention includes a power input unit to which AC power is input; a lighting output unit for outputting DC power generated using the AC power; and a relay circuit formed between the power input unit and the lighting output unit.

When a transformer is formed between the power input unit and the lighting output unit, the relay circuit unit may be connected in series between the transformer and the lighting output unit.

The afterglow prevention device of the present invention can prevent the afterglow of lighting caused by the transformer through the relay circuit unit connected in series between the transformer and the lighting output unit.

The present invention can perform a physical switching operation on both the positive terminal and the negative terminal connected to the lighting to reliably prevent the afterglow of the lighting caused by the organic power caused by the transformer.

Macroscopically, if the switch is disposed between the input terminal of the AC power and the output terminal of the DC power, afterglow may be prevented. However, when a plurality of circuits performing various functions are connected in series between the input terminal and the output terminal, a problem may arise as to where to place the switch.

This is because some of the circuits connected in series between the input terminal of the AC power and the output terminal of the DC power may be advantageously driven by using the DC power as it is.

In such a situation, the afterglow prevention device of the present invention can specify a position at which a switch having a function of preventing afterglow is disposed in a complex circuit structure. In addition, the afterglow prevention device of the present invention also provides a means for controlling the corresponding switch.

1 is a schematic view showing an afterglow prevention device of the present invention.
2 is a schematic diagram showing a three-phase, four-wire AC power supply.
3 is a schematic view showing another afterglow prevention device of the present invention.
4 is a circuit diagram of an afterglow prevention device according to an exemplary embodiment.
5 is a schematic diagram illustrating a power supply device in which a relay circuit unit is excluded.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

In the present specification, duplicate descriptions of the same components will be omitted.

Also, in this specification, when a component is referred to as 'connected' or 'connected' to another component, it may be directly connected or connected to the other component, but other components in the middle It should be understood that there may be On the other hand, in the present specification, when it is mentioned that a certain element is 'directly connected' or 'directly connected' to another element, it should be understood that the other element does not exist in the middle.

In addition, the terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention.

Also, in this specification, the singular expression may include the plural expression unless the context clearly dictates otherwise.

Also, in this specification, terms such as 'include' or 'have' are only intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more It should be understood that the existence or addition of other features, numbers, steps, acts, components, parts, or combinations thereof, is not precluded in advance.

Also in this specification, the term 'and/or' includes a combination of a plurality of listed items or any of a plurality of listed items. In this specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Also, in this specification, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

1 is a schematic view showing an afterglow prevention device of the present invention. 2 is a schematic diagram showing a three-phase, four-wire AC power supply.

The afterglow prevention device illustrated in FIG. 1 may include a power input unit 110 , a lighting output unit 190 , and a relay circuit unit 170 .

AC power may be input to the power input unit 110 .

For example, three-phase AC electricity corresponding to commercial power may be input to the power input unit 110 . At this time, the three-phase, four-wire AC electricity can be expressed as four R, S, T, and N (Neutral) phases. 380V is applied between RST phase and 220V is applied between N phase and other phases.

A single-phase AC power source composed of one of three phases and an N-phase may be provided at a work site such as a factory. The transformer 109 may be used in the process of converting the AC power to the DC power. The transformer 109 may have a non-insulated structure in which a coil of an input terminal and a coil of an output terminal are spaced apart from each other. In this case, even if the power is cut off, organic power may be introduced into the lighting or the lighting power supply (power supply) through one of the three phases (R, S, T) connected. In this case, afterglow comes into the lighting even after the power is cut off.

In order to prevent the afterglow of lighting caused by the transformer 109, the present invention adds a relay circuit 170 for preventing afterglow to the power supply, and through this, the relay circuit 170 corresponds to the added power supply. An afterglow prevention device may be provided.

The afterglow prevention device may configure a circuit for installing a relay on the DC power output terminal side and interlocking with an on-off switch of the lighting to cut off (short circuit) the DC power output. Through this, the power induced by the transformer 109 is completely cut off, and as a result, the generation of afterglow due to the transformer 109 can be reliably suppressed. In addition, the relay for preventing the occurrence of afterglow may serve as a function of a switching means for determining whether to supply power from the perspective of lighting.

The power input unit 110 may include a terminal, a connector, etc. to which AC power such as commercial power is input.

The lighting output unit 190 may output DC power. In this case, the DC power may be generated using the AC power input through the power input unit 110 . For example, DC power is generated by rectifying AC power, and the generated DC power may be output as an external load, for example, lighting through the lighting output unit 190 .

The lighting output unit 190 may include a terminal through which DC power is output, a connector, and the like.

The relay circuit unit 170 may be formed between the power input unit 110 and the lighting output unit 190 . Between the power input unit 110 and the lighting output unit 190 is a circuit for converting AC power to DC power, a circuit for improving the power factor of AC power or DC power, and a circuit for generating a control signal for lighting according to a user's operation , a constant voltage circuit, a constant current circuit, and the like, various circuits may be disposed. The circuit may include a transformer 109 in which a coil is wound a plurality of times for various reasons. In this case, the relay circuit unit 170 may be connected in series between the transformer 109 and the lighting output unit 190 .

The relay circuit unit 170 may include a circuit including a relay corresponding to a switch. The relay circuit unit 170 connected in series between the transformer 109 and the lighting output unit 190 may disconnect or short-circuit the electrical connection between the transformer 109 and the lighting output unit 190 . Through the disconnection of the electrical connection, it is possible to suppress the inflow of organic power or the like that causes the afterglow of the lighting into the lighting.

According to an environment in which a variety of and a large number of circuits may be disposed between the power input unit 110 and the lighting output unit 190 , a plurality of transformers 109 may be installed between the power input unit 110 and the light output unit 190 . can be provided in between.

In this case, the relay circuit unit 170 may be connected in series between the last transformer 109 disposed at the last (downstream) of the plurality of transformers 109 and the lighting output unit 190 in the flow of power.

When the relay turns off between the transformer 109 and the lighting output unit 190 through the series connection structure, the transformer 109 and the lighting output unit 190 may be physically completely disconnected.

As described above, when the transformer 109 has a non-insulated structure in which a plurality of coils disconnected from each other are wound, an afterglow field may be generated in the lighting even when the power is turned off due to organic power. To prevent this, the relay circuit unit 170 may include a switch that physically connects or disconnects the output terminal of the coil and the input terminal of the lighting output unit 190 .

According to the relay circuit unit 170 , when the power is turned off, the organic power output from the transformer 109 cannot flow along a line physically disconnected from the lighting output unit 190 . As a result, the organic power that causes the afterglow of the illumination is not provided to the illumination, and the afterglow can be prevented.

The transformer 109 for outputting DC power may be provided with two output terminals. Two output terminals of the transformer 109 may be electrically connected to a positive terminal and a negative terminal of the lighting output unit 190 , respectively.

A switch may be provided in the relay circuit unit 170 .

The switch may adjust the first connection state between any one of the output terminals of the transformer 109 and the positive terminal of the lighting output unit 190 .

The switch may adjust the second connection state between the other one of the output terminals of the transformer 109 and the negative terminal of the lighting output unit 190 .

The switch may simultaneously adjust the first connection state and the second connection state in real time. For example, in the switch, the first connection state is a state in which any one of the output terminals of the transformer 109 and the positive terminal of the lighting output unit 190 are connected (short-circuited) to each other (short-circuit state), and the second state is also a transformer The (109) output terminal and the negative terminal of the lighting output unit 190 may be connected to each other.

When the first connection state is changed from a short circuit state to a disconnected state (a state in which the transformer 109 output terminal and the positive terminal of the lighting output unit 190 are disconnected), the second connection state is also disconnected from the short circuit state at the same time (a state in which the output terminal of the transformer 109 and the negative terminal of the lighting output unit are disconnected).

According to the present embodiment, when the power of the lighting is turned off, the anode line and the cathode line providing DC power are both cut off, so that the electrical energy output to the lighting can be reliably excluded.

The lighting output unit 190 may output DC power to various loads such as lighting as a target.

The afterglow prevention device may be provided with a switching control unit 150 for controlling on/off of lighting. For example, the switching control unit 150 may perform a control of turning on or off the lighting by a user's manipulation.

The switch provided in the relay circuit unit 170 needs to properly adjust the short-circuit state and the disconnected state. For example, a switch may operate as a short circuit when the light is on. The switch may operate in a disconnected state when the light is off. Looking at it, the operation of the switch may be directly related to the on/off of the light.

Accordingly, the switch of the relay circuit unit 170 is preferably controlled together with the lighting by the switching control unit 150 .

The switching control unit 150 may turn on (light on) or off (light off state) in a manner that controls the output of DC power through the lighting output unit 190 . Looking from another perspective, the switching control unit 150 may control the on/off of the lighting receiving DC power from the lighting output unit 190 .

The switching control unit 150 may be provided with a sensing means for sensing the pressure or touch applied by the user, such as a button or a photo coupler. The switching control unit 150 may generate an application signal or a blocking signal through these sensing means.

When an application signal for applying the output of the DC power is generated by the switching control unit 150, the switch of the relay circuit unit 170 may adjust the first connection state and the second connection state to a short circuit (short circuit state) according to the applied signal. have.

When a blocking signal for blocking the output of DC power is generated by the switching control unit 150, the switch of the relay circuit unit 170 adjusts the first connection state and the second connection state to disconnection (disconnection state) according to the blocking signal. can

When the on/off control signal of the lighting is transmitted from the switching controller 130 to the lighting, the relay circuit unit 170 may additionally receive an on/off control signal from the switching controller 130 .

The relay circuit unit 170 may control the electrical connection between the lighting output unit 190 and the lighting or the electrical connection between the transformer 109 and the lighting output unit 190 according to a control signal.

3 is a schematic view showing another afterglow prevention device of the present invention. 4 is a circuit diagram of an afterglow prevention device according to an exemplary embodiment.

A rectifying unit 130 may be additionally provided in the afterglow prevention device that also functions as a power supply device.

The rectifying unit 130 may be disposed between the power input unit 110 and the relay circuit unit 170 . In this case, the switching control unit 150 may be disposed between the rectifying unit 130 and the relay circuit unit 170 .

The rectifier 130 may rectify AC power to generate DC power. To this end, rectifying means such as a bridge diode and a smoothing circuit may be provided in the rectifying unit 130 .

The switching control unit 150 may generate a control signal according to a user's operation intended to turn on/off the lighting while being driven using the DC power generated by the rectifying unit 130 .

The relay circuit unit 170 may block or unblock the DC power provided to the lighting between the switching control unit 150 and the lighting output unit 190 (LED output unit) according to a control signal.

The relay circuit unit 170 may switch on/off the lighting by blocking or unblocking the DC power and at the same time prevent the afterglow of the lighting.

When the two output terminals of the transformer 109 are respectively connected to the positive terminal and the negative terminal of the lighting output unit 190 , the switch provided in the relay circuit unit 170 connects the first output terminal and the positive terminal of the output terminals to the first can be switched. Also, the corresponding switch may second switch the connection between the second output terminal and the negative terminal among the output terminals.

The switch includes a first control terminal connected to a control line 179 through which a control signal flows, a second control terminal, and a first control terminal and a second control terminal connected in series to control the first switching and the second switching according to the control signal Control means may be provided.

The second control terminal may be connected to the collector of the transistor via a resistor.

An emitter of the transistor may be connected in parallel to the second output terminal.

The base of the transistor may be connected in parallel to the control line 179 via a constant voltage diode and resistor.

A control signal may be reduced and applied to the base of the transistor through a constant voltage diode such as a Zener diode.

The control means may receive an original control signal flowing along the control line 179 in accordance with the reduced control signal applied to the base of the transistor.

When the original control signal means that the light is on, the control means first switches so that the first output terminal and the positive terminal are connected (shorted), and at the same time, the second output terminal and the negative terminal are connected (shorted) A second switch is possible.

When the control signal means that the lighting is off, the control means may perform a first switching so that the first output terminal and the positive terminal are disconnected, and at the same time, the second switching may be performed so that the second output terminal and the negative terminal are disconnected.

A power factor correction circuit 140 and a constant current/constant voltage circuit 160 may be additionally provided in the afterglow prevention device.

The power factor correction circuit 140 may be formed between the rectifier 130 and the switching controller 150 .

The constant current/constant voltage circuit 160 may be formed between the switching control unit 150 and the relay circuit unit 170 .

5 is a schematic diagram illustrating a power supply device in which a relay circuit unit is excluded.

Referring to the power supply device of FIG. 5 , there is no control line 179 , and there is also no relay circuit unit 170 controlled by the control line 179 .

In this case, even when the lighting is turned off, the power applied to the input terminal of the transformer 109 is induced and transmitted to the output terminal of the transformer 109, and the organic power generated to the output terminal of the transformer 109 is supplied as lighting and may cause afterglow. .

Looking at the power supply device of FIG. 5, functionally, the rectifier 130, the power factor correction circuit 140, the switching control unit 150, the constant current/constant voltage circuit 160, and the lighting output unit 190 are sequentially connected in series. .

At this time, there may be a problem as to where to place the relay circuit unit 170 . The relay circuit unit 170 may be a factor determining the provision of power required for normal driving of lighting as well as power that induces afterglow. Accordingly, it is preferable that the relay circuit unit 170 operated by the control signal according to the control signal generated by the switching control unit 150 is once disposed at the rear end or downstream of the switching control unit 150 . When the relay circuit unit 170 is disposed at the front end or upstream of the switching control unit 150 , the DC power delivered to the switching control unit 150 may be cut off due to the off operation of the relay circuit unit 170 . In this case, there is a problem in that a control signal necessary for an on operation of the relay circuit unit 170 later cannot be generated by the switching control unit 150 . Accordingly, the relay circuit unit 170 is preferably disposed downstream of the switching control unit 150 .

If the transformer 109 is present downstream of the switching control unit 150 , the relay circuit unit 170 is preferably disposed at the rear end or downstream of the corresponding transformer 109 in order to suppress organic power from being transmitted to the lighting.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also presented. It belongs to the scope of the invention.

109...transformer 110...power input
130...rectifier 140...power factor correction circuit
150...switching control unit 160...constant current/constant voltage circuit
170...Relay circuit section 179...Control line
190...light output

Claims (9)

a power input unit to which AC power is input;
a lighting output unit for outputting DC power generated using the AC power;
a relay circuit formed between the power input unit and the lighting output unit;
When a transformer is formed between the power input and the lighting output,
The relay circuit unit is connected in series between the transformer and the lighting output unit,
A rectifying unit disposed between the power input unit and the relay circuit unit, and a switching control unit disposed between the rectifying unit and the relay circuit unit are provided;
The rectifier rectifies the AC power to generate the DC power,
The switching control unit generates a control signal according to a user's manipulation intended to turn on/off the lighting while being driven using the DC power,
The relay circuit unit blocks or unblocks the DC power provided to the lighting between the switching control unit and the lighting output unit according to the control signal,
The relay circuit unit prevents the afterglow of the lighting while at the same time switching the on/off of the lighting through blocking or unblocking the DC power,
When the two output terminals of the transformer are respectively connected to the positive terminal and the negative terminal of the lighting output,
A switch is provided for first switching a connection between a first output terminal of the output terminals and the positive terminal, and second switching a connection between a second output terminal of the output terminals and the negative terminal,
The switch includes a first control terminal connected to a control line through which the control signal flows, a second control terminal, and the first control terminal and the second control terminal connected in series to the first switching terminal and the second control terminal according to the control signal. 2 control means for controlling the switching are provided;
the second control terminal is connected to the collector of the transistor via a resistor,
the emitter of the transistor is connected in parallel to the second output terminal;
The base of the transistor is connected in parallel to the control line via a constant voltage diode and a resistor,
The control signal is reduced and applied to the base of the transistor through the constant voltage diode,
The control means receives a control signal flowing along the control line in accordance with the reduced control signal applied to the base of the transistor,
When the control signal means that the lighting is turned on, the control means performs a first switching so that the first output terminal and the positive terminal are connected, and at the same time, the second switching is performed so that the second output terminal and the negative terminal are connected,
When the control signal means that the illumination is off, the control means performs first switching so that the first output terminal and the positive terminal are disconnected, and at the same time, the second switching is performed so that the second output terminal and the negative terminal are disconnected. prevention device.
According to claim 1,
When a plurality of transformers are provided between the power input unit and the lighting output unit,
The relay circuit unit is an afterglow prevention device connected between the last transformer and the lighting output unit disposed last in the flow of the power.
According to claim 1,
When the transformer has a non-insulated structure in which the coil of the input terminal and the coil of the output terminal are spaced apart,
The relay circuit unit includes a switch for physically connecting or disconnecting the output terminal of the coil and the input terminal of the lighting output unit.
According to claim 1,
When the two output terminals of the transformer are respectively connected to the positive terminal and the negative terminal of the lighting output,
The relay circuit unit is provided with a switch for regulating a first connection state between any one of the output terminals and the positive terminal and a second connection state between the other one of the output terminals and the negative terminal in real time.
5. The method of claim 4,
The lighting output unit outputs the DC power to the lighting target,
A switching control unit for controlling the on/off of the lighting is provided,
The switch is an afterglow prevention device that is controlled together with the lighting by the switching control unit.
5. The method of claim 4,
A switching control unit for controlling output of the DC power through the lighting output unit is provided;
When an application signal for applying the output of the DC power is generated by the switching control unit, the switch adjusts the first connection state and the second connection state to a short circuit according to the application signal,
When a blocking signal for blocking the output of the DC power is generated by the switching controller, the switch adjusts the first connection state and the second connection state to be disconnected according to the blocking signal.
According to claim 1,
A switching control unit for controlling on/off of the lighting receiving the DC power from the lighting output unit is provided,
The relay circuit unit receives the additional control signal from the switching control unit when the on-off control signal of the lighting is transmitted from the switching control unit to the lighting,
The relay circuit unit controls an electrical connection between the light output unit and the light according to the control signal.
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