KR20110061088A - Power supply device for using a led light and method of the same - Google Patents

Abstract

PURPOSE: A power supply device for an LED lamp and method thereof are provided to stably control output AC power applied to a light control unit in the rated power range of an LED display device. CONSTITUTION: An input system(100) performs high band pass and micro power factor compensation in a pulsation AC component to generate pulsation DC power for driving. An output system(200) emits light based on the rating state of the LED display device by applying output AC power to the LED display device. A control system(300) feeds the PWM signal back to the output system to control a switching operation.

Description

Power supply device for LED lighting and its method {Power Supply Device for using a LED Light and Method of the Same}

TECHNICAL FIELD The present invention relates to a power supply control technology, and in particular, to control the switching conversion operation with a PWM signal to maintain the active increase and decrease of the resonance gain and the smooth operation in the rated power range of the LED indicator product, a capacitor for high pass and fine power factor correction The present invention relates to a power supply for LED lighting and a method for further improving power factor and total harmonic distortion.

A commonly used power supply device rectifies and then smoothes AC power. In this process, the power factor and total harmonic distortion (THD) characteristics of the input AC power are not excellent.

That is, the conventional power supply device must be equipped with a power factor correction circuit for adjusting the power scope to suit the characteristics of the power factor correction and the output load and a converter circuit for power consumption, and consumed according to the function and rated power of each product. Since the amount of parts and the circuit size to be taken into consideration also have a problem that the input and output efficiency is reduced.

The power factor correction circuit requires a separate circuit configuration using an active power factor correction, a charge pump, and a bellows fill, thereby increasing the complexity of the circuit design and increasing the number of component devices.

In addition, in the active power factor correcting method used in the conventional power supply, there is a problem that a high voltage is applied to the entire circuit by applying a step-up step-up converter as an example, thereby giving voltage stress to each component element.

The LED lighting power supply device and method thereof of the present invention have been devised to solve the problems of the prior art, and the first object of the present invention is to control the power factor and resonance by controlling the switching conversion operation of the output system with the feedback PWM signal. This is to make the LED indicator light up to the rated state by improving the gain.

A second object of the present invention is to minimize the number of component elements used to improve power factor and total harmonic distortion by improving high pass and fine power factor using a high pass and fine power factor correction capacitor.

The third object of the present invention is to maximize the performance of the device to increase the expectations of buyers to increase the satisfaction and sales.

The present invention for achieving the above object includes the following configuration.

That is, the LED lighting power supply device according to an embodiment of the present invention comprises: an input system unit for generating a pulsating DC power supply by driving the pulsating DC component obtained by full-wave rectification of the input AC power high pass and fine power factor; The high frequency power generated by switching the pulsating DC power for driving is applied to the instrumented resonant circuit to control the resonance gain, and the relative alternating current component and the relative alternating current are generated for the output AC power generated through the resonance gain control. An output system unit for detecting an AC power supply respectively; And AC-DC conversion of the relative AC current component and the relative AC power component, respectively, to generate first and second DC powers, and to compare and measure the first and second DC powers with a predetermined reference power value, respectively. And a control system unit for performing an AND operation on the first and second square wave signals generated by amplifying and converting the first and second difference values to extract a PWM signal, wherein the control system unit feeds back the PWM signal to the output system unit for switching. Controlling the conversion operation, the output system is characterized in that for applying the output AC power to the instrument indicator LED indicator to emit light in accordance with the rated state of the LED indicator.

In addition, the power supply method of the LED lighting power supply device according to an embodiment of the present invention, the pulsating DC power supply by driving the pulsating DC component obtained by the full-wave rectification of the AC power inputted by the input system part high pass and fine power factor correction Generating; Controlling the resonance gain by applying the generated high frequency power to the instrumented resonant circuit by an output system unit switching switching the pulsating DC power for driving; Detecting, by the output system unit, a relative AC current component and a relative AC power component, respectively, for the output AC power generated by controlling the resonance gain; Generating, by a control system, first and second DC power by AC-DC converting the relative AC current and the relative AC power; The control system comparing and measuring the first and second DC powers with a predetermined reference power value, respectively, and amplifying and signal converting the first and second difference values generated through the control system; Controlling the switching conversion operation by feeding back the PWM signal extracted from the first and second square wave signals generated by the amplification and signal conversion through an AND operation to the output system; And outputting, by the output system unit, the output AC power to the instrumented LED indicator to emit light according to the rated state of the LED indicator.

The LED lighting power supply and the method of the present invention have the first effect of smoothly emitting the LED indicator by controlling the switching conversion operation of the output system section with the feedback PWM signal.

In addition, the present invention further improves the power factor and total harmonic distortion by using the high pass and power factor correction capacitors to further improve the power factor and total harmonic distortion, and minimizes the number of component elements used to improve the power factor and total harmonic distortion. give.

In addition, the present invention has a third effect of maximizing the device performance to increase the buyer's satisfaction and to increase the expectations for increased sales.

[Example]

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a power supply for lighting according to an embodiment of the present invention.

Referring to FIG. 1, the lighting power supply device 1000 includes an input system unit 100, an output system unit 200, and a control system unit 300.

First, the input system unit 100 generates a pulsating DC power source for driving the pulsating DC component obtained by full-wave rectification of the input AC power by high pass and fine power factor correction.

That is, when AC power supplied through a commercial power line is input to the input system unit 100 of the lighting power supply device 1000, the input system unit 100 includes an EMI including a varistor having resistance to instantaneous high voltage or surge. After passing through the filter unit 110, the AC power is rectified by the pulsating DC using the full wave rectifying unit 120.

At this time, the capacitor (hereinafter, high-pass and fine power factor correction capacitor: C1) provided in the full-wave rectifying unit 120, as shown in Figure 3, also serves as a high-pass filter and according to the EMI filter unit 110 configuration It also acts as a fine power factor correction for high power factor so that minute power factor fluctuations converge to almost one.

When the power factor is finely compensated by the high pass and fine backflow correction capacitor (C1), the power factor (effective power / apparent power) is greater than 0.9 and THD (Total Harmonic Distortion: Total Harmonic Distortion = Harmonic Amplitude / Basic Wave Amplitude * 100) Appears as a value of 20% or less.

The input grid 100 includes an EMI filter 110 and a full wave rectifier 120 as shown in FIG. 2.

 The EMI filter unit 110 removes a high frequency noise component in the input AC power and prevents an external output of the high frequency noise component.

As shown in FIG. 3, the full wave rectifying unit 120 rectifies an AC power source from which high frequency noise is removed using a bridge diode BR connected to an output terminal of the EMI filter unit 110, thereby obtaining a pulse obtained by full wave rectification. Dynamic DC components are high pass and auxiliary power factor correction.

In addition, the full-wave rectifier 120 applies the pulsating direct current component output from the bridge diode BR connected to the high pass and fine power factor correction capacitor C1 to perform the high pass and fine power factor correction, thereby driving the pulsating direct current. Generate power.

Here, the high-pass and fine power factor correction capacitor (C1) has a value of 0.1 ㎌ to 0.47 ㎌ value, in the case of the smoothing capacitor generally used, dozens larger than the capacity of the high pass and fine power factor correction capacitor (C1). The high pass and power factor correction is difficult because it is designed to a value of ㎌ to several hundred ㎌.

Subsequently, the output system unit 200 controls the resonance gain by applying the generated high frequency power to the instrumented resonant circuit by switching and converting the driving pulsating DC power supply, and output AC power generated through the resonance gain control. The relative AC current and the relative AC power supply are detected respectively.

The output system 200 applies the output AC power to the instrument indicator LED indicator 230 to emit light according to the rated state of the LED indicator 230.

That is, the output system unit 200 applies a pulsating DC power source for driving to a plurality of device-equipped field effect transistors (FETs) to operate switching conversion, and then outputs the output AC power output through the resonance gain control to RLC. It is applied to the transformer primary side inductor L1 and the first, second and third resistors R1, R2 and R3 of the resonant circuit.

The output system unit 200 detects the relative alternating current generated by the output AC power generated through the resonant circuit to both terminals of the secondary inductor L2 corresponding to the transformer primary side inductor L1, and outputs the output AC power. A target AC voltage divided by the first, second, and third resistors R1, R2, and R3 is detected as an object, and the output AC power is supplied to the LED indicator 230 having a series of parallel LEDs D1 to D6. It can be said to provide a device.

More specifically, the output system 200 includes a switch driver 210, an output unit 220, and a dimming unit 230 as shown in FIG. 2.

The switch driver 210 applies a pulsating DC power source for driving to a plurality of FETs Q1 and Q2 that perform an inverter function, and performs switching conversion to generate high frequency power generated through switching conversion.

The switch driver 210 includes an inverter and a drive IC, as shown in FIG. 3.

That is, the inverter is a plurality of FET (Field Effect Transistor: Q1, Q2) elements are each connected in a half-bridge form, and generates a high frequency power source by switching the driving pulsating DC power supply to a plurality of FET elements (Q1, Q2). .

The drive IC receives the PWM signal fed back from the control system unit 300, inputs a control signal to each gate terminal of the plurality of FET elements Q1 and Q2, and switches the switching operation of the plurality of FET elements Q1 and Q2. To control.

The output unit 220 controls the resonance gain by inputting a high frequency power source into the instrumented RLC resonant circuit, and induces the output AC power generated by the resonance gain control to penetrate the inductor in the RLC resonant circuit to generate a relative AC current component. It outputs and divides by the 1st, 2nd, and 3rd resistance values R1, R2, R3 comprised in series and parallel circuits, and produces | generates a counterpart AC power supply.

As shown in FIG. 3, the output unit 220 includes a connection portion between a source terminal present in one of the plurality of FETs Q1 and Q2 and a drain terminal present in the other and a transformer primary coil mounted thereon. After connecting the L1) and the capacitor C2 to form an RLC resonant circuit, a relative AC current is output through both terminals of the transformer secondary side coil L2 corresponding to the transformer primary side coil L1.

Hereinafter, a formal approach to the RLC resonant circuit generated by the relative AC current component and the relative AC power component will be further understood.

For example, when high frequency power is supplied to L1 of the RLC resonant circuit, the intrinsic impedance Z known from L1 and C2 is wL1-(1 / wC2), and the total impedance Ztot on the resonant circuit is Rt + j ( wL1-(1 / wC2)).

Here, Rt is the total resistance value (it is a real value) shown by calculating and processing R1 // R2 // R3 equivalently.

)와 고유 임피던스 Z에는 영향을 주지 않음으로 고주파 전원 제어 또는 PWM 신호를 이용해 공진 이득(혹은, 출력 이득)을 제어할 수 있다.That is, as shown in the above equation, the change of Rt value affects the overall impedance, but the resonance frequency (intrinsic constant of the resonance circuit itself)

) And the intrinsic impedance Z can be used to control the resonant gain (or output gain) using high-frequency power control or PWM signals.

Next, the output AC power applied to L1 affects the relative alternating current component extracted from L2. The number of coil turns of the current component * L1 of the output AC power is the number of coil turns of the relative alternating current component * L2.

In other words, the relative alternating current component can be obtained as the current component * (L1 / L2) of the output AC power supply.

The dimming unit 230, which is an end of the output system unit 200, according to an exemplary embodiment of the present invention receives the output AC power and emits the LED indicator 230 configured as the serial LED arrays D1 to D6.

Since the plurality of light emitting diodes D1 to D6 arranged in parallel are configured to have opposite polarities as shown in FIG. 3, high frequency signals or low frequency signals are contained even without considering polarity inherent in the light emitting diodes. Light is supplied according to the rated state with the supplied output AC power.

Subsequently, the control system unit 300 AC-DC converts the relative AC current component and the relative AC power component, respectively, to generate the first and second DC power sources, and compares the first and second DC power sources with the preset reference power values, respectively. After the measurement, the first and second square wave signals generated by amplifying and signal converting the first and second difference values obtained therefrom are ANDed to extract the PWM signal.

The control system 300 feeds back the PWM signal to the output system 200 to control the switching conversion operation.

In other words, the control system unit 300 AC-DC converts each of the relative AC currents and the relative AC powers output from the output system unit 200 to generate first and second DC powers, respectively. After amplifying the DC power source and comparing the respective output values, it will be referred to a device for feeding back the predetermined PWM signal to the output system 200.

Here, the PWM signal fed back to the output system unit 200 controls the maximum-minimum peak value for the driving pulsation DC power applied to the switch driver 210 of the output system unit 200 to output the resonance gain (output power / Note that the signal is an active tuning of the input power).

As shown in FIG. 2, the control system unit 300 includes a first DC power detector 310, a second DC power detector 320, an amplifier 330, and a comparison and signal generator 340. .

That is, after receiving the relative alternating current component, the first DC power detector 310 generates the first DC power by converting the relative alternating current component to the first AC-DC conversion.

The second DC power detector 320 is connected to some terminals of the first, second and third resistors R1, R2 and R3 provided to the output system unit 200, and the first, second and third resistors R1, The relative AC power supply divided by R2 and R3) is converted into a second AC-DC conversion to a second DC power supply.

The amplifier 330 compares the first and second DC power supplies with a predetermined reference power value, respectively, and amplifies the first and second difference values measured between the first and second DC power supplies and the reference power values, respectively. Generate power.

The comparison and signal generator 340 loads the first and second amplified power supplies into the first and second square wave signals, respectively, and converts the first and second square wave signals into ANDs according to the AND operation. Select one of the 1 and 2 square wave signals with the larger pulse width as the PWM signal.

The reason why the pulse width is selected as the PWM signal among the first and second square wave signals is that when either one of the detected relative AC current and the relative AC voltage becomes high, one of the first and second square wave signals has a pulse width. Narrows.

In other words, if the relative alternating current component has a normal value, if the relative alternating current component is excessively generated, the PWM signal is generated using the relative alternating current component based on the principle of the minimum rate through the AND operation. Even if the relative AC voltage is excessively generated, the PWM signal is generated using the relative AC current.

Figure 4 is a flow chart illustrating a power supply method of a power supply for LED lighting according to an embodiment of the present invention.

Referring to FIG. 4, a power supply method of an LED lighting power supply is a method of actively controlling an output gain by switching and converting into a PWM signal, and further improving power factor and total harmonic distortion by using a high pass and fine power factor correction capacitor. .

First, the input system unit generates a pulsating DC power source by driving high frequency and fine power factor correction of the pulsating DC component obtained by full-wave rectification of the input AC power (S10, S20, S30).

The output system unit controls the resonance gain by applying the generated high frequency power to the instrumented resonant circuit by switching the driving pulsating DC power supply (S40, S50).

The output system unit detects the relative AC current and the relative AC power for the output AC power generated by controlling the resonance gain (S60).

The control system unit AC-DC converts the relative AC current component and the relative AC power component, respectively, to generate first and second DC power sources (S70 and S80).

The control system compares and measures the first and second DC power sources and the predetermined reference power values, respectively, and amplifies and converts the first and second difference values generated through the control (S90 and S100).

The control system extracts the PWM signal by amplifying the first and second difference values using an instrumented amplifying unit and then performing an AND operation on the first and second square wave signals obtained by converting the first and second amplified power supplies generated through the amplification ( S110, S120).

The control system feeds back the PWM signal to the output system to control the switching conversion operation (S130).

The output system unit applies the relative AC power to the instrument ratio LED indicator to emit light in accordance with the rated state of the LED indicator (S140, S150).

While the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

1 is a view showing a power supply for LED lighting according to an embodiment of the present invention.

2 is another view specifically showing a power supply for LED lighting according to an embodiment of the present invention.

3 is a circuit diagram specifically showing a power supply for LED lighting according to an embodiment of the present invention.

Figure 4 is a flow chart illustrating a power supply method of a power supply for LED lighting according to an embodiment of the present invention.

Claims (8)

An input system unit configured to generate a pulsating DC power supply by driving the pulsating DC component obtained by full-wave rectification of the input AC power to generate a driving pulsation DC power supply; The high frequency power generated by switching the pulsating DC power for driving is applied to the instrumented resonant circuit to control the resonance gain, and the relative alternating current component and the relative alternating current are generated for the output AC power generated through the resonance gain control. An output system unit for detecting an AC power supply respectively; And The first and second DC powers are generated by AC-DC conversion of the relative AC currents and the relative AC powers, respectively, and the first and second DC powers and the predetermined reference power values are compared and measured, respectively. It includes a control system for extracting the PWM signal by AND-operating the first and second square wave signals generated by amplifying and signal conversion of the first and second differences, The control system part feeds back the PWM signal to the output system part to control the switching conversion operation, and the output system part applies the output AC power to an instrumented LED indicator to emit light according to the rated state of the LED indicator. Characterized in that the LED lighting power supply. The method of claim 1, wherein the input system unit, An EMI filter unit for removing high frequency noise components in the input AC power and preventing external output of the high frequency noise components; And Power supply for LED lighting comprising a full-wave rectifier for high pass and fine power factor correction of the pulsating direct current component obtained by the full-wave rectification as a full-wave rectification of the AC power using a bridge diode connected to the output terminal of the EMI filter unit Feeder. The wave rectifier of claim 2, A high pass and fine power factor correction capacitor connected to the bridge diode and configured to generate the driving pulsation DC power by high pass and fine power factor correction of the pulsating DC component output from the bridge diode, The high pass and fine power factor correction capacitor is a power supply for LED lighting, characterized in that having a value of 0.1 kW to 0.47 kW. The method of claim 1, wherein the output system unit, A switch driving unit applying the driving pulsating DC power to a plurality of FETs performing an inverter function, switching conversion, and generating high frequency power generated through the switching conversion; The resonance gain is controlled by inputting the high frequency power supply into a mechanically provided resonant circuit, and the relative alternating current portion penetrating through the inductor of the resonant circuit and the relative alternating current power portion divided by the first, second, and third resistances of the resonant circuit. An output unit to generate; And And a dimming unit configured to receive the output AC power and emit an LED indicator configured in a series-parallel LED array. The method of claim 4, wherein the switch drive unit, A plurality of field effect transistor (FET) elements connected to each other in the form of a half bridge, and an inverter for switching the driving pulsating direct current power source into the plurality of FET elements to generate the high frequency power source; And And a drive IC receiving the PWM signal and inputting a control signal to each gate terminal of the plurality of FET devices to control switching conversion operations of the plurality of FET devices. The method of claim 4, wherein the output unit, The RLC resonant circuit is formed by connecting a connection portion between a source terminal present in one of the plurality of FETs and a drain terminal present in the other and a transformer primary side inductor and a capacitor mounted thereon to form the RLC resonant circuit. An LED lighting power supply, characterized in that for outputting the relative AC current through both terminals of the transformer secondary side inductor corresponding to the inductor. The method of claim 1, wherein the control system, A first DC power detection unit configured to generate a first DC power by converting the relative AC current into a first AC-DC after receiving the relative AC current; A second AC-DC conversion of the relative AC power supply divided by the first, second, and third resistors provided in the output system part to the second DC power supply; A second DC power detection unit configured to make; An amplifying unit configured to generate first and second amplified power sources by amplifying the first and second difference values generated by comparison measurements between the first and second DC power supplies and the reference power values; And The first and second amplified powers are loaded on parasitic sawtooth signals, respectively, and converted into first and second square wave signals. Then, the first and second square wave signals are ANDed to have a large pulse width among the first and second square wave signals. LED lighting power supply characterized in that it comprises a comparison and signal generation unit for selecting one as a PWM signal. Generating a pulsating DC power source by driving the pulsating DC component obtained by full-wave rectification of the AC power inputted by the input system unit by high pass and fine power factor correction; Controlling the resonance gain by applying the generated high frequency power to the instrumented resonant circuit by an output system unit switching switching the pulsating DC power for driving; Detecting, by the output system unit, a relative AC current component and a relative AC power component, respectively, for the output AC power generated by controlling the resonance gain; Generating, by a control system, first and second DC power by AC-DC converting the relative AC current and the relative AC power; The control system comparing and measuring the first and second DC powers with a predetermined reference power value, respectively, and amplifying and signal converting the first and second difference values generated through the control system; Controlling the switching conversion operation by feeding back the PWM signal extracted from the first and second square wave signals generated by the amplification and signal conversion through an AND operation to the output system; And And applying the output AC power to the instrumented LED indicator to emit light in accordance with the rated state of the LED indicator.

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