KR20150040450A - Power supplying apparatus - Google Patents

Abstract

The present invention relates to a power supply device for supplying power to a plasma display panel. The power supply device of the present invention comprises: a first power conversion unit which alternately switches input power applied to the primary side of a first transformer to output predetermined sustain power and address power to the secondary side of the first transformer; a second power conversion unit which switches input power applied to the primary side of a second transformer to output predetermined first and second multi-power to the secondary side of the second transformer; and a stabilization unit which generates predetermined output power from the secondary side of the first transformer to transmit the output power to the output terminal of the first multi-power.

Description

POWER SUPPLYING APPARATUS

The present invention relates to a power supply apparatus capable of supplying power to a plasma display panel.

Recently, various kinds of display devices have been developed and used. Examples of such a display device include a cathode ray tube (CRT), a liquid crystal display (LCD), and a plasma display panel (PDP). Particularly, the liquid crystal display device and the plasma display panel have been widely used because of their small thickness and large screen configuration.

Unlike a plasma display panel, a backlight is separately used for a liquid crystal display device because it has no self-emission characteristic unlike a plasma display panel, and a cold cathode fluorescent lamp (CCFL) is mainly used as a backlight used in such a liquid crystal display Such a backlight has a problem that the size of the device is large, power consumption is high, and manufacturing cost is high. Accordingly, although plasma display panels are mainly used as display devices in order to pursue light weight shortening and cost reduction and to satisfy consumers' tendencies, such plasma display panels are also required to be thinner and thinner in the same way, to be.

A power supply device for supplying a necessary driving power to the plasma display panel may be employed. The power supply device of the plasma display panel may supply a plurality of voltages, that is, a standby voltage Vstb), a multi-voltage (Vm), an address voltage (Va), and a sustain voltage (Vs).

On the other hand, when the load of the high-voltage output stage of the multi-voltage increases, the cross-regulation problem occurs. Especially, when the load of the low-voltage output stage used as the main feedback voltage in the multi- The problem of voltage drop occurs.

In the following prior art document, Patent Document 1 discloses a SMPS circuit for a PDP, which discloses a method for reducing the overall size and volume of a PDP power system using one insulated transformer. However, The contents are not disclosed.

Korean Patent Publication No. 10-2008-0005707

SUMMARY OF THE INVENTION The present invention provides a power supply apparatus for stabilizing a voltage level of a high-voltage multi-power source by providing an auxiliary winding in a transformer for generating a sustain power source and an address power source output power source.

According to a first technical aspect of the present invention, there is provided a plasma display apparatus comprising: a first power conversion unit for alternately switching an input power applied to a primary side of a first transformer to output a predetermined sustain power and an address power to a secondary side of the first transformer; A second power conversion unit for switching the input power applied to the primary side of the second transformer to output predetermined first and second multiple power supplies to the secondary side of the second transformer; A stabilizer for generating a predetermined output power from a secondary side of the first transformer and delivering the generated output power to an output terminal of the first multi power source; And a power supply.

The stabilizer may include: an auxiliary winding provided on a secondary side of the first transformer; And a power transmitting unit for transmitting power from the auxiliary winding to an output terminal of the first multi power supply; . ≪ / RTI >

Wherein the stabilizing unit further comprises an output unit for stabilizing and smoothing the power supplied to the auxiliary winding and providing the power to the power supply unit.

The power transmission unit may include a diode including an anode connected to the auxiliary winding and a cathode connected to an output terminal of the first multi power source.

The voltage level of the power supply output from the stabilization unit may be set equal to the voltage level of the first multi power supply.

The voltage level of the first multi power supply may be set to be higher than the voltage level of the second multi power supply.

The second power conversion unit may switch the input power by feeding back the voltage level of the second multi power.

The power supply unit may include: a rectifying and smoothing unit for rectifying and smoothing the AC power; As shown in FIG.

A power factor correcting part for correcting a power factor of the direct current power source from the rectifying and smoothing part and supplying the corrected power factor to the switching part; As shown in FIG.

According to the power supply apparatus according to the embodiment of the present invention, the voltage level of the high voltage multi-power supply can be stabilized by providing the auxiliary winding in the transformer for generating the sustain power and the address power output power.

1 is a circuit diagram schematically showing a power supply apparatus according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

1 is a circuit diagram schematically showing a power supply apparatus according to an embodiment of the present invention. Referring to FIG. 1, one embodiment of the power supply apparatus of the present invention may include a first power conversion unit 100, a second power conversion unit 200, and a stabilization unit 300, 400 and a power factor correction unit 500. [

The power supply apparatus according to the present embodiment can generate a sustain power, an address power, and a plurality of multi power sources and supply the power to the plasma display panel.

The rectifying and smoothing unit 400 can rectify and smooth the AC power source AC and transmit the same to the power factor correcting unit 500. The AC power source (AC) may have a level of 90 to 270 Vrms as a commercial line input power source.

The power factor correcting unit 500 can correct the power factor by adjusting the phase difference between the voltage and the current of the direct current power source from the rectifying and smoothing unit 400. [ At this time, the power supplied from the rectifying and smoothing unit 400 is set-up or boosted up to output DC power of about 370 to 400 V, and the power supplied from the power factor correcting unit 500 The power is transmitted to the first power conversion unit 100 and the second power conversion unit 200 to generate various power supplies required for the plasma display panel.

The first power conversion unit 100 may include a switching unit 110, a transforming unit 120, a first output unit 130, a second output unit 140, and a first control unit 160. The switching unit 110 may include at least two switches M1 and M2 stacked between an input power source and a ground to which DC power is input from the power factor correcting unit 500. The switches M1 and M2 are connected to the power source A conversion operation can be performed.

The transformer 120 may include a resonant tank LT and a first transformer T1 and the resonant tank LT may provide a resonant operation by an inductor Lr-inductor Lm-capacitor Cr (LLC) , And one of the inductors Lm may be a magnetization inductor of the first transformer T1. The first transformer T1 may include a primary winding Np1 and secondary windings Ns1 and Ns2 and the primary winding Np1 and the secondary windings Ns1 and Ns2 may be electrically insulated. That is, the electrical properties of the ground of the primary winding Np1 and the secondary windings Ns1 and Ns2 may be different from each other.

The primary winding Np1 and the secondary windings Ns1 and Ns2 form a predetermined winding ratio and the secondary windings Ns1 and Ns2 can vary the voltage level according to the winding ratio to output power.

The first output unit 130 can rectify and stabilize the first power from the secondary winding Ns1 and output it, and can supply it to a predetermined load. At this time, the power output from the first output unit 130 may be the sustain power Ps.

The second output unit 140 may also rectify and stabilize the second power source generated in the secondary winding Ns2 similarly to the first output unit 130, respectively. At this time, the second power source output from the second output unit 140 may be the address power source Pa.

The first controller 160 controls the switching frequency and the duty of the switching unit 110 by controlling the power of the first output unit 130 to control the power levels of the first power source and the second power source. More specifically, the power supply level of the first power supply can be controlled by controlling the switching frequency of the switching unit 110, and the power supply level of the second power supply can be controlled by controlling the switching duty of the switching unit 110.

The technology for controlling the power supply level of the first power supply at the switching frequency through one control circuit and the switching circuit in the case of multiple output from the power supply unit and controlling the power supply level of the second power supply with the switching duty is disclosed in the well- Therefore, a detailed description thereof will be omitted.

The second power conversion unit 200 may include a switch M3, a second transform unit 210, a fourth output unit 220, a fifth output unit 230, and a second control unit 240. The second transformer 210 includes a second transformer T2 and the second transformer T1 is composed of a primary winding Np2 and secondary windings Ns4 and Ns5. The power source induced by the primary winding Np2 of the second transformer T2 is transferred to the secondary windings Ns4 and Ns5 according to the switching operation of the switch M3 and the transmitted power is supplied to the primary winding Np2 and the secondary windings Ns4, The voltage level is changed according to the preset winding ratio of the inverter Ns5. At this time, the primary winding Np2 and the secondary windings Ns4 and Ns5 can be electrically insulated.

The fourth output unit 220 rectifies and smoothes the power supplied from the secondary winding Ns4 to output the fourth power, and the fifth output unit 230 rectifies and smoothes the power delivered from the secondary winding Ns5, So that the output fifth power can be outputted. The second controller 240 controls the switching operation of the switch M3 by feeding back the fifth power from the fifth output unit 230.

At this time, assuming that the voltage level of the power Pm1 outputted from the fourth output unit 220 is higher than the voltage level of the power Pm2 outputted from the fifth output unit 230, the output level of the output unit 220 of the fourth output unit 220 There is a problem that cross regulation occurs when the load state is a heavy load state and further when the load state of the output terminal of the fifth output unit 230 is a light load state. That is, the voltage level of the power source Pm1 output from the fifth output unit 230 falls below the target voltage level. This may cause the flat panel plasma display to be turned off and the second transformer T2 to overheat .

In order to solve the above problem, the present embodiment has a stabilizing unit 300, and a third power source is provided with a secondary winding on the secondary side of the first transformer T2, and the third power source is connected to the fourth output unit 210 .

More specifically, the stabilization unit 300 includes a secondary winding Ns3, a third output unit 310, and a power supply unit 320 to generate a third power source and deliver it to the fourth output unit 210 do. More specifically, the secondary winding Ns3 forms a predetermined winding ratio with the primary winding Np1 to vary the voltage level of the power source induced in the primary winding Np1, and the third output unit 310 And rectifies and stabilizes the power output from the secondary winding Ns3 to generate the third power source. The third power is transmitted to the fourth output unit 210 through the power supply unit 320. The power supply unit 300 may include a diode having an anode connected to the output terminal of the third output unit 310 and a cathode connected to the output terminal of the fourth output unit 210.

In this case, the voltage level of the third power source may be set equal to the target voltage level of the fourth power source Pm1, or may be set as high as the voltage drop amount of the diode from the target voltage level. Thus, even when the fourth power source cross- The voltage level of the fourth power supply can be kept constant.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

100: first power source conversion section
110:
120: Transformer
130: first output section
140: second output section
150:
200: second power source conversion section
210: fourth output section
220: fifth output section
230: second control section
300: Stabilization unit
310: third output section
320: Power supply unit
400: rectifying and smoothing part
500: power factor correction unit

Claims (9)

A first power converter for alternately switching an input power source applied to the primary side of the first transformer and outputting a predetermined sustain power and address power to the secondary side of the first transformer;
A second power conversion unit for switching the input power applied to the primary side of the second transformer to output predetermined first and second multiple power supplies to the secondary side of the second transformer; And
A stabilizer for generating a predetermined output power from a secondary side of the first transformer and delivering the generated output power to an output terminal of the first multi power source; ≪ / RTI >
The apparatus according to claim 1,
An auxiliary winding provided on a secondary side of the first transformer; And
A power supply unit for transmitting power from the auxiliary power source to an output terminal of the first multi power source; ≪ / RTI >
3. The apparatus according to claim 2,
An output unit for stabilizing and smoothing power supplied to the auxiliary winding and providing the power to the power supply unit; Further comprising a power supply.
The power supply unit according to claim 2,
A diode connected to the auxiliary winding and an anode connected to an output of the first multi-supply.
The method according to claim 1,
Wherein the voltage level of the power supply output from the stabilization unit is set equal to the voltage level of the first multi power supply.
The method according to claim 1,
Wherein the voltage level of the first multi power supply is higher than the voltage level of the second multi power supply.
The apparatus of claim 1, wherein the second power conversion unit comprises:
And for switching the input power by feeding back the voltage level of the second multi power supply.
The plasma display apparatus of claim 1, wherein the power supply unit
A rectifying and smoothing unit for rectifying and smoothing the AC power; Further comprising a power supply.
9. The method of claim 8,
A power factor correcting part for correcting a power factor of the direct current power source from the rectifying and smoothing part and supplying the corrected power factor to the switching part; Further comprising a power supply.

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