KR102108329B1 - Power supply device for using a LED Light having function of converting power - Google Patents

Abstract

The present invention relates to a power supply device for LED lighting. More particularly, the present invention is to a technology which allows the brightness of each LED lighting to be kept constant by selectively varying a power level supplied to a LED lighting unit made of at least one LED lighting corresponding to the number switches with power level set ON. According to the present invention, a power supply device for LED lighting having an output power conversion function comprises: a pulse width modulation (PWM) control unit which generates and outputs a PWM control signal corresponding to a DC power level as a transformer for converting AC power to DC, but generates a PWM control signal with a different DC power level in response to a resistance value of a resistance unit connected to an input terminal; a fixed resistor which maintains the connection so that current always flows to the input terminal of the PWM control unit; at least one selection resistor whose connection state through which the current flows is selectively set corresponding to the number of ON switches are connected in parallel to the input terminal of the PWM control unit to vary the current level input to the PWM control unit; and a power level setting unit which sets the connection state so that current flows through the selection resistor in correspondence to the number of the switches that are set to ON.

Description

Power supply device for using a LED Light having function of converting power

The present invention relates to a power supply for LED lighting, by selectively varying the power level supplied to the LED lighting unit consisting of at least one LED lighting corresponding to the number of ON (ON) set switch, the brightness of each LED lighting is constant It's about the technology that keeps you in good shape.

The LED lighting device is recognized as an eco-friendly lighting because it has a relatively low power consumption and a long lifespan compared to other lights.

This LED lighting device is operated with a power supply that provides stable power, such as SMPS, and SMPS includes various technologies for preventing flicker and controlling dimming.

SMPS is a DC stabilized power supply widely used in most electronic communication devices, and refers to a device that converts power characteristics so that any power can be used in a specific load equipment.

The SMPS is capable of supplying a high-efficiency power supply by controlling the flow of power using the switching characteristics of the semiconductor device, and also miniaturization and weight reduction by miniaturizing energy storage devices such as capacitors and inductors. Due to such advantages of high efficiency, small size and light weight, SMPS is widely used as a power supply for LED lighting devices.

Recently, in order to operate the LED lighting device more efficiently, a plurality of LED lights are arranged at different locations in a separate form or a single LED lighting device is divided into a plurality of LED lights and operated.

1 schematically shows a conventional LED lighting system, and in general, for each LED lighting, each SMPS for driving the corresponding LED lighting is provided in a one-to-one correspondence as shown in (A).

Accordingly, when installing a plurality of LED lights in one place or location, there is a problem in that installation costs due to securing more than a certain installation space, and a large cost of having a plurality of SMPS.

Accordingly, there may be a method of connecting and operating a plurality of LED lights for one SMPS, but in general, since the power level output through the conventional SMPS is constant, the number of LED lights according to the number of LED lights in operation is constant. There is a problem that the brightness is different.

For example, when the first and second LED lights are connected to the SMPS from which 50W power is output, the first and second LED lights when the first and second LED lights are operated compared to when only the first LED lights are operated The brightness of is darker than when only the first LED light is operated.

Accordingly, there is a need for an SMPS that drives a plurality of LED lights using one SMPS, but allows the plurality of LED lights to have the same brightness.

On the other hand, in a structure in which a plurality of switches are connected to one LED light in a small space or the like, a function capable of varying the brightness may be required depending on the situation.

For example, when one switch is on, 25W brightness may be provided, and when two switches are on, an environment that provides 50W brightness may be required.

Thus, conventionally, by providing a plurality of SMPS corresponding to the switch as shown in Figure 1 (B), it can be configured to provide different brightness according to the number of switches that are set to ON.

However, since a plurality of SMPSs must be provided to drive one LED light, there is a problem in installation cost.

Accordingly, there is a need for an SMPS capable of providing different brightnesses in response to the number of switches that are turned on using one SMPS.

1. Domestic registered patent No. 10-1330830 (Name: AC LED lighting device) 2. Domestic registered patent No. 10-1273233 (Name: Flicker prevention device when dimming the LED lamp)

Accordingly, the present invention was created in view of the above-described circumstances, by selectively varying the power level supplied to the LED lighting unit consisting of a plurality of LED lights corresponding to the number of ON switches, one SMPS is used. Therefore, the technical object of the present invention is to provide a power supply for LED lighting having an output power conversion function that allows the brightness of each LED lighting to be kept constant.

In addition, according to the present invention, by selectively varying the power level supplied to the LED lighting unit consisting of one LED light corresponding to the number of ON switches, the brightness of the LED light can be varied using one SMPS. Another technical purpose is to provide a power supply for LED lighting having an output power conversion function.

According to an aspect of the present invention for achieving the above object, AC power is input and converted to DC power and then supplied as driving power to a lighting unit made of at least one LED light, but a plurality of switches are connected to the AC power line. In the power supply for LED lighting that converts output power and supplies it to LED lights in response to the number of switches set to ON, a PWM control signal corresponding to a DC power level as a transformer for converting AC power to DC A PWM control unit generating a PWM control signal for outputting DC power corresponding to a resistance value of a resistance unit connected to the input terminal, and a fixed resistor maintaining a connection state so that current always flows to the input terminal of the PWM control unit. , At least one wire in which the connection state through which the current flows is selectively set corresponding to the number of switches that are set to ON A tack resistor is connected in parallel to the input terminal of the PWM control unit to change the current level input to the PWM control unit, and the connection state so that current flows to the selection resistor corresponding to the number of switches set to ON. It comprises a power level setting unit for setting, and the power level setting unit is connected to the plurality of switches in a one-to-one match, a plurality of photo couplers conducting as the matched switch is turned on (ON), each photo A plurality of transistors connected to the output terminal of the coupler on a one-to-one correspondence and turned on as the photo coupler conducts, and a plurality of transistors connected in series to be connected to the input of the gate, and to the drain the PWM control to the input terminal Selected as the transistor is turned ON by connecting at least one selection resistor to be connected The LED lighting power supply having an output power conversion function, characterized in that comprises a FET which connection current to flow in terms are provided.

In addition, the switch is composed of first and second switches, and when the first and second switches are set to ON, the power level setting unit sets the FET to be in a conducting state and connects the current to flow through the selection resistor. The PWM control unit is provided with a power supply for LED lighting having an output power conversion function characterized in that it generates a PWM control signal corresponding to a resistance value corresponding to a fixed resistor and a selection resistor connected in parallel with current flowing. .

In addition, the power level setting unit is configured by providing a bridge circuit connected to the power line of each switch connected to the AC power line in a one-to-one correspondence with the number of switches, and each bridge circuit is applied from a switch set to ON. A power supply for LED lighting having an output power conversion function is provided, which is configured to rectify power and provide it to the input side of the transformer, and to apply it to an input terminal of a photo coupler matching the corresponding switch.

According to the present invention, by selectively varying the power level supplied to the LED light by using one SMPS in correspondence with the number of ON-set switches, the brightness of a plurality of LED lights is kept constant or one LED It is easy to install and can provide a lower cost SMPS that can selectively change the brightness of the lighting.

That is, when one switch is ON using one SMPS, for example, 25W power is supplied to the LED light, and when two switches are ON, 50W power is supplied to the LED light, for example. You can.

1 is a view for explaining the configuration of a general LED lighting system.
2 is a view showing a schematic configuration of a power supply for LED lighting having an output power conversion function according to a first embodiment of the present invention.
Figure 3 is a block diagram showing the functional separation of the internal configuration of the power supply 100 shown in FIG.
4 is a diagram illustrating a detailed circuit diagram of the power supply 100 shown in FIG. 3.

The configurations shown in the embodiments and drawings described in the present invention are only preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, so the scope of the present invention is the embodiments and drawings described in the text It should not be construed as limited by. That is, since the embodiments can be variously changed and have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing technical ideas. In addition, the purpose or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such an effect, and the scope of the present invention should not be understood as being limited thereby.

All terms used herein have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains, unless otherwise defined. The terms defined in the commonly used dictionary should be interpreted as being consistent with meanings in the context of related technologies, and cannot be interpreted as having ideal or excessively formal meanings that are not explicitly defined in the present invention.

2 is a view showing a schematic configuration of a power supply for LED lighting having an output power conversion function according to the first embodiment of the present invention.

Referring to FIG. 2, the LED lighting power supply 100 having an output power conversion function according to the first embodiment of the present invention receives AC power and converts it into DC power to supply it as driving power for LED lighting. At one end, a switch part 200 made of a plurality of switches connected to an external power line is coupled, and an LED light part 300 made of a plurality of LED lights is coupled to the other end.

In FIG. 2, the switch unit 200 is composed of the first and second switches 210, and the LED lighting unit 300 is illustrated as consisting of first to second LED lights 310 and 320, but is not limited thereto.

The power supply device 100 outputs output power of different levels to the LED lights 300 in response to the on / off states of the first and second switches 210 and 220. At this time, the power supply 100 is configured to support output power at a level capable of supplying the same power to all LED lights 300 to be driven and controlled.

That is, the power supply 100 provides the first level output power to the first LED light 310 in response to the ON state of the first switch 210, and turns on the second switch 220 In response to the (ON) state, the second LED light 320 provides a first level output power, and when both the first and second switches 210 and 220 are in an ON state, a higher level than the first level Outputs 2 levels of output power.

In addition, as another embodiment of the present invention, in the above-described structure, the power supply device 100 may be coupled to the LED lighting unit 300 made of one LED light.

In this case, when the first or second switches 210 and 220 are turned on, the power supply 100 supplies, for example, 25W power as one LED light, and both the first and second switches 210 and 220 are When turned on, for example, 50W power is supplied as one LED light, so that the brightness of the LED light can be varied.

As a result, the power supply device 100 according to the present invention converts the level of the output power to correspond to the number of switches that are set to ON, and supplies it to the LED lighting unit 300 made of one or more LED lights.

Next, the configuration and operation of the power supply 100 shown in FIG. 2 will be described with reference to FIGS. 3 and 4. 3 is a block diagram of the power supply 100, and FIG. 4 is a detailed circuit diagram thereof.

3 and 4, the power supply 100 includes an electromagnetic wave reducing unit 110, a primary rectifying unit 120, a transformer 130, a secondary rectifying unit 140, and a flicker reducing unit 150. , PWM control unit 160 and a power level setting unit 170.

The electromagnetic wave reduction unit 110 filters the noise component from the 220V AC power applied from the outside and filters the switching noise so that it does not flow back into the AC input line.

The electromagnetic wave reduction unit 110 is connected to the power lines connected to the first and second switches 210 and 220 through the power level setting unit 170 to input an AC signal. That is, an AC signal is input through a power line connected to a switch set to ON in the electromagnetic wave reduction unit 110. In addition, the electromagnetic wave reduction unit 110 is configured by connecting two electromagnetic wave blocking filters CM1 and LF1 in parallel.

The primary-side rectifying unit 120 fully rectifies AC power from which noise applied from the electromagnetic wave reduction unit 110 is removed, and outputs a pulse current. The primary-side rectifier 120 fully rectifies the AC power through the bridge circuit D1 and stabilizes it through the capacitors C1 and C2 and outputs it.

The transformer 130 is composed of a transformer T1 that obtains a constant voltage from a power applied from the primary rectifier 120 and outputs the induced power to the secondary circuit 140. The transformer T1 converts and outputs AC power to DC power according to the PWM control signal.

The secondary-side rectifying unit 140 acquires induction power formed in the secondary-side coil of the transformer T1, rectifies it, and outputs it. That is, the secondary-side rectifier 140 includes diodes 6 (D6) and 7 (D7) for rectifying the output power to the output terminal of the transformer (T1), and the transformer (T1) during turn-on (ON) and turn-off (OFF) ) As a snubber that protects by limiting the overvoltage from being induced on the secondary side, the series-connected resistors 11 (R11) and capacitor 7 (C7) are configured in parallel.

The flicker reducing unit 150 minimizes the ripple of the power output through the secondary-side rectifying unit 140 and transmits it to the LED lighting 300, thereby eliminating flicker of the LED lighting 300.

The PWM control unit 160 senses the current applied to the transformer T1 to generate a PWM control signal, and inputs it to the transformer T1. The PWM control unit 160 is provided with a pulse width modulation (PWM) drive IC U1 to control the on / off of the transformer T1 by a PWM method.

Particularly, in the present invention, the PWM control unit 160 generates a PWM signal applied to the primary side of the transformer T1 in response to the operation of the power level setting unit 170, which limits the current of the PWM drive IC U1. It is configured to output different PWM control signals according to activation states of a plurality of resistors RS1, RS2, RS3, and RS4 connected in parallel to the terminal 5. That is, the PWM control unit 160 outputs a PWM control signal for outputting DC power corresponding to the resistance value of the resistance unit 170.

The power level setting unit 170 is a core feature of the present invention, and includes a switch state detection block 171, a resistance setting block 172, and a resistance unit 173.

The switch state detection block 171 is connected to the power line of the first switch 210, the first photo coupler (PC1) and on / off operation corresponding to the on / off state of the first switch 210, the second It is configured to include a second photo coupler (PC2) that is connected to the power line of the switch 220 and is turned on / off corresponding to the on / off state of the second switch 220.

Also, the switch state detection block 171 includes a first bridge circuit DC3 connected to the power line of the first switch 210 and a second bridge circuit DC4 connected to the power line of the second switch 220. The electromagnetic wave reduction unit 110 by rectifying external AC power through the first and second bridge circuits DC3 and DC4 corresponding to the first and second switches 210 and 220 that are switched to the ON state. To supply.

In the resistor setting block 172, the first transistor Q1 and the second transistor Q2 are connected in series, the emitter of the second transistor Q2 is connected to the input of the gate of the FET Q3, and the FET Q3 ), The selection resistor 173-2 of the resistor unit 173 is connected.

At this time, the first transistor Q1 is coupled to the output terminal of the first photocoupler PC1 and turned on / off according to the on / off state of the first photocoupler PC1, and the second transistor Q2 is the second It is turned on / off according to the on / off state of the photocoupler PC2.

In addition, when both the first and second transistors Q1 and Q2 are turned on, the FET Q3 conducts, and the selection resistor 173-2 of the resistor unit 173 is additionally activated to flow a current. do.

The resistor unit 173 is a resistor connected in parallel to the PWM control unit 160 to set the input current level, and a fixed resistor 173-1 that maintains the connection state so that current always flows in the path with the PWM control unit 160 ) And at least one selection resistor 173-2 in which a connection state in which a current flows is selectively set corresponding to the number of switches that are set to ON are connected in parallel.

That is, the resistor unit 173 basically inputs a constant current to the PWM controller 160 by the fixed resistor 173-1, but selects the resistor 173-2 according to the number of ON switches. By additionally activating and setting the connection so that current flows through the selection resistor 173-2, the resistance value connected in parallel to the input terminal of the PWM control unit 160 is varied to vary the amount of current input to the PWM control unit 160.

Next, the output power conversion operation of the power supply having the above-described configuration will be described according to the switch driving state of the switch unit 100.

First, in the current limiting terminal 5 of the PWM control unit 160, the fixed resistor 173-1 of the resistor unit 173 is set to an electrically connected state, and the selection resistor 173-2 is electrically disconnected. Is set to

1. When only one of the first or second switches 210 and 220 is turned on

In the following description, only the first switch 210 is turned on, which is operated in the same manner even when only the second switch 220 is turned on.

When only the first switch 210 is ON in the above-described state, only the first photo coupler PC1 connected to the power line of the first switch 210 is ON, and the second switch 220 is turned on. The second photo coupler PC2 connected to the power line is maintained in an OFF state.

Then, as the first photo coupler PC1 is turned on, the first transistor Q1 connected to the output terminal of the first photo coupler PC1 is turned on to be turned on.

On the other hand, since the second photo coupler PC2 is in an OFF state, the second transistor Q2 connected to the output terminal maintains an OFF state, and thus a FET connected to the emitter of the second transistor Q2 (Q3) maintains an OFF state.

Accordingly, the selection resistor 173-2 connected to the drain of the FET Q3 maintains a state not connected to the PWM control unit 160.

As a result, the input of the PWM control unit 160 is set in a state in which current flows only through the fixed resistor 173-1 of the resistance unit 173 with respect to the ON setting of the first switch 210, so that the PWM control unit ( 160) generates a PWM control signal corresponding to, for example, a 25W output corresponding to the fixed resistor 173-1, and provides it to the transformer 130.

Therefore, when only one of the first or second switches 210 and 220 is turned on, 25W power is supplied to the LED lighting unit 300.

That is, when the LED lighting unit 300 is made of a plurality of LED lights, 25W power is supplied to the LED lights corresponding to the ON switch.

2. When both the first switch and the second switch 210 and 220 are turned on

When both the first and second switches 210 and 220 are ON, a first photo coupler PC1 connected to the power line of the first switch 210 and a power line connected to the power line of the second switch 220 are connected. 2 Both photo couplers PC2 are switched to the ON state.

Then, as the first photo coupler PC1 is turned on, the first transistor Q1 connected to the output terminal of the first photo coupler PC1 is turned on and switched to the ON state, and the second photo coupler ( As PC2) is turned on, the second transistor Q2 connected to its output terminal is also turned on and switched to the on state, since both the first and second transistors Q1 and Q2 are turned on. Accordingly, the FET Q3 connected to the emitter of the second transistor Q2 is switched to the ON state.

Accordingly, the selection resistor 173-2 connected to the drain of the FET Q3 is electrically connected to the PWM control unit 160.

As a result, both the fixed resistors 173-1 and the selection resistors 173-2 connected in parallel with respect to the ON setting of the first and second switches 210 and 220 are in a state in which current flows, so that the PWM control unit 160 When only one switch is set to ON in response to the fixed resistor 173-1 and the selection resistor 173-2 with the current limiting terminal 5, a greater level of current is applied to the PWM control unit 160 The PWM control unit 160 generates a PWM control signal corresponding to, for example, a 50W output and provides it to the transformer 130.

Accordingly, when both the first and second switches 210 and 220 are turned on, 50W power is supplied to the LED lighting unit 300.

That is, when the LED lighting unit 300 is made of a plurality of LED lights, 25W power is respectively supplied to the first and second LED lights corresponding to the ON switch.

In addition, when one LED light is coupled to the power supply device 100, power of 50W is supplied by one LED light.

On the other hand, in the above embodiment, one selection resistor corresponding to two switches is configured in parallel to a fixed resistor, and when both switches are turned on, the selection resistors are electrically connected, so that the preset second It was implemented to output different powers, but N-1 selection resistors were configured in parallel to fixed resistors in response to N switches, and selection resistors were selectively activated according to the number of ON switches. Of course it is possible. This can be achieved by adding a photodiode, a transistor, and a FET corresponding to the number of optional resistors to be added, and detailed description thereof is omitted.

100: power supply, 200: switch,
300: LED lighting.
110: electromagnetic wave reduction unit, 120: primary side rectification unit,
130: transformer, 140: secondary rectification part,
150: flicker reduction unit, 160: PWM control unit,
170: power level setting unit.

Claims (3)

After receiving AC power and converting it to DC power, it is supplied as driving power to a lighting unit made of at least one LED light, but a number of switches are connected to the AC power line, and corresponding to the number of switches that are set to ON. In the power supply for LED lighting to convert the output power to supply to the LED lighting,
A PWM control unit that generates and outputs a PWM control signal corresponding to a DC power level as a transformer for converting AC power to DC, and generates a PWM control signal for outputting DC power corresponding to a resistance value of a resistance unit connected to an input terminal.
A fixed resistor that maintains a connection state so that current always flows to the input terminal of the PWM control part, and at least one or more selection resistors that selectively set a connection state in which the current flows corresponding to the number of switches that are set to ON are selected from the PWM control part. Resistor unit connected in parallel to the input terminal to vary the current level input to the PWM control unit,
It is configured to include a power level setting unit for setting the connection state so that the current flows to the selection resistor corresponding to the number of the ON (ON) set switch,
The power level setting unit is connected to the plurality of switches in a one-to-one match and connected to a plurality of photo couplers that are conducted as the matched switch is switched to the ON state, and the corresponding photo coupler is connected to the output terminal of each photo coupler one to one. Transistors by connecting at least one selection resistor connected to the input of the gate, and a plurality of transistors, and a plurality of transistors are connected in series connected to the input of the gate, the drain to the PWM control unit as the conduction, Power supply for LED lighting having an output power conversion function, characterized in that it comprises a FET to establish a connection so that the current flows to the selected resistor as it is switched on (ON).
According to claim 1,
The switch is composed of first and second switches,
When both the first and second switches are set to ON, the power level setting unit sets the FET to a conducting state and sets the connection so that current flows through the selected resistor.
The PWM control unit is a power supply for LED lighting having an output power conversion function characterized in that it generates a PWM control signal corresponding to a resistance value corresponding to a fixed resistor and a selection resistor connected in parallel with current flowing.
According to claim 1,
The power level setting unit is configured by providing a bridge circuit connected to the power line of each switch connected to the AC power line in a one-to-one correspondence with the number of switches,
Each bridge circuit rectifies power supplied from a switch that is set to ON and provides it to the input side of the transformer, and also has an output power conversion function characterized by being configured to be applied to an input terminal of a photo coupler matching the switch. Power supply for LED lighting.

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