KR100472282B1 - Apparatus for saving power - Google Patents

Abstract

The present invention is a coil installed in parallel to the first and second power input terminal; A plurality of input side and output side tabs arranged along the coil to select input and output voltages respectively; First and second selection switches installed in series on the input and output side taps, respectively, and selectively switching to a specific tap; First power saving mode switches installed in parallel with the first and second power input terminals to operate an input voltage in a power saving mode; A first relay connected in series with the first power saving mode switch to turn off / on a plurality of relay switches when the first power saving mode switch is closed; A first relay switch installed in series between the first power input terminal and the power output terminal and closed when the first power saving mode switch is opened to bypass the input voltage to the output terminal; It is installed in parallel with the first power output terminal and the coil end to conduct the function to short-circuit the coil when the first power saving mode switch is opened, and to protect the voltage drop of the input side tap momentarily when the first relay switch is opened. Circuit section; And a harmonic removing unit installed in parallel to the first and second power output stages to remove harmonic currents of the output power, thereby preventing an instantaneous power failure due to switch switching when switching to a power saving mode. It provides household power control power saving device to prevent sudden voltage drop through transformer and increase reliability of output voltage when switching to power saving mode through protection circuit and harmonic rejection part of output stage.

Description

Household power control power saving device using single winding transformer {APPARATUS FOR SAVING POWER}

The present invention relates to a power saving device, and more particularly, to implement a power saving device using a single winding transformer to reduce the use coil compared to a lottery transformer, and to save power through a protection circuit and a harmonic elimination circuit at the output stage. The present invention relates to a power saving power saving device using a single winding transformer that prevents a sudden voltage drop through a transformer and compensates power factor removal and power factor by increasing the reliability of the output voltage.

The voltage supplied to each home is typically 220V or 110V and the voltage supplied to the building or business is approximately 380V.

According to the Electricity Business Law, the voltage supplied to each home or business is maintained at 207V to 233V, which is within ± 13V of standard voltage for 220V, and 354V to 406V, which is within ± 26V of standard voltage for 380V. have.

The voltage supplied to each home or business is somewhat different from each other. In general, the incoming voltage is often high because the voltage is increased in consideration of the voltage drop during wiring (based on the maximum value of 230V in the column transformer). .

In addition, in the case of electric equipment using 220V and 380V, there should be no abnormality in the voltage range of 198V ~ 242V and ± 342% and 342V ~ 418V that are ± 10%. There is no problem with the normal operation of the equipment at.

By lowering the voltage supplied to each home to the minimum rated voltage of the load by using the voltage supply range and the allowable voltage characteristics of the electric equipment specified in the Electricity Business Act, it may have a power saving effect.

For this reason, there have been various developments of power saving devices for discharge lamps, and conventional power saving devices for discharge lamps have a single winding transformer and a lottery winding transformer. However, a single winding transformer has been discharged. Next, when the applied voltage was switched to a low voltage, the supply of electricity was momentarily interrupted. At this time, the discharge lamp was turned off so that it did not turn on again.

In order to overcome the shortcomings of the single winding transformer, a lottery transformer has been developed, and the power saving device using the lottery transformer has excellent function as a power saving device because the supply of electricity is not interrupted even when the applied voltage is switched to a low voltage. Since the switch and the primary coil for energizing the external primary voltage to turn on the discharge lamp are quite large, the total volume of the power saving device increases and the manufacturing cost increases.

The configuration and detailed description of the conventional power saving device using such a single winding transformer or a lottery transformer will be described later.

In addition, such a power saving device is manufactured separately for each voltage used, and the producer has a dual production and management burden of separately manufacturing and managing 110V, 220V, or 380V, respectively. Therefore, there was an economic burden of separately purchasing 110V and 220V.

Accordingly, an object of the present invention is to improve the circuit of the conventional single winding transformer by designing, to provide a home power control power saving device using a single winding transformer that can prevent a momentary power failure due to switch switching when switching to the power saving mode. There is.

Another object of the present invention is to implement a power saving device using a single winding transformer to reduce the use coil compared to the lottery transformer, and also to switch to the power saving mode through the protection circuit and harmonic rejection circuit of the output stage sudden voltage through the transformer The present invention provides a power saving power saving device for home use using a single winding transformer that prevents a drop and compensates the output harmonics and compensates for the power factor.

Technical means of the present invention for achieving the above object is a single coil (C11) is installed in parallel to the first and second power input terminal for up or down the input voltage; A plurality of input side tabs (T1 to T3) arranged on one side of the coil to select a voltage level input through a first power input terminal; A first selection switch (S11) installed in series between the first power input terminal and the input side tap and selectively switching to a specific tap by a control signal; A plurality of output side tabs (T4 to T6) arranged on the other side of the coil in a length direction for outputting up or down an input side tap and a voltage output through the coil; A second selection switch (S12) installed in series between the output side tab and the first power output terminal and selectively switching to a specific tap by a control signal; A first power saving mode switch (S13) installed in parallel to the first and second power input terminals, which are front ends of the coil, to open and close according to a control signal to operate the input voltage in a power saving mode; A first relay Ry1 connected in series with the first power saving mode switch to turn off or on a plurality of relay switches when the first power saving mode switch is closed; A first relay switch (Ry1b1) disposed in series between the first power input terminal and the first power output terminal and closed when the first power saving mode switch is opened to bypass the input voltage to the output terminal; A second power saving mode switch (S14) connected in parallel with the first relay to open and close according to a control signal to operate an input voltage in a power saving mode; A second relay (Ry2) connected in series with the second power saving mode switch to turn off or on the plurality of relay switches when the second power saving mode switch is turned on; It is installed in parallel with the first power output terminal and the coil end to conduct the function to short-circuit the coil when the first power saving mode switch is opened, and to protect the voltage drop of the input side tap momentarily when the first relay switch is opened. Circuit section 11; And a harmonic removal unit 15 installed in parallel with the first and second power output terminals to remove harmonic currents of the output power and to compensate for the power factor.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, a conventional power saving device will be described in order to help understanding of the present invention.

1 is a power saving device using a single winding transformer according to the prior art, and as shown, the power saving device has one coil C, and a plurality of tabs T1 and T2 along the longitudinal direction of the coil C. , T3, T4) are installed.

The first switch S1 and the second switch S2 are provided in the circuit, and the second switch S2 is connected to any one predetermined tap (tab T3 in the illustrated example). The pair of terminals P1 and P2 are connected to the external power source E as shown by the dotted line, and the other pair of terminals P3 and P4 are connected to the load L. The first and second switches S1 and S2 are connected to respective timers (not shown).

In the power saving device configured as described above, the first switch S1 is closed and the second switch S2 is open in the first stage of attempting to operate the load (in the case of a discharge lamp). Therefore, when power is applied from the outside, the load L operates through a circuit including the closed first switch S1. When the load L is operated, the first switch S1 is opened and the second switch S2 is closed by the operation of each timer (not shown).

Here, since the coil C functions as a single winding transformer, when the first switch S1 is opened and the second switch S2 is closed, the secondary voltage after passing through the single winding transformer C is the primary. The voltage is lowered compared to the voltage (voltage applied from the outside). The secondary voltage varies depending on which tap the second switch S2 is connected to among the plurality of taps T1, T2, T3, and T4 installed in the coil C.

However, in the power saving device, if the first and second switches S1 and S2 are closed at the same time, the branch circuit including the coil C is shorted and the power saving device is burned out. When switching the opening / closing of S1 and S2, the first switch S1 must be opened first and then the second switch S2 must be closed.

Accordingly, when switching the opening and closing of the first and second switches S1 and S2, the supply of electricity is momentarily stopped, and at this time, the discharge lamp is turned off so that the switch is not turned on again. As it is for a large current that needs to conduct a large current corresponding to the load capacity, spark and surge voltage generated at the moment when the contact is opened and closed may affect the load, especially when handling flammable materials. The danger of fire cannot be excluded.

In order to solve this problem, a power saving device using a lottery transformer has been developed in the related art, as shown in FIG. 2, and such a power saving device includes a pair of coils C1 and C2 having different winding directions. The insulator INS is located in the pair, and the pair of coils C1 and C2 play a role as a double winding transformer having a polarity, and an induced voltage is generated in the coils C1 and C2. In the circuit, there are first and second switches S1 and S2, and the secondary coil C2 is provided with a plurality of taps T1, T2, T3, and T4, in which tap the second switch S2 is located. The magnitude of the induced voltage varies depending on whether it is connected to.

Therefore, in the first stage of operating the load (in the case of a discharge lamp), the first switch S1 is closed and the second switch S2 is open. At this time, the load L is applied by the primary voltage applied from the outside. ) Is activated, the second switch S2 is connected to any one of the plurality of taps T1, T2, T3, and T4 by a timer connected to the first and second switches S1 and S2, and the first switch S1 is opened. After that, the induced voltage induced in the coils C1 and C2 is transferred to the load L to maintain continuous lighting. Since the induced voltage induced in the coils C1 and C2 is lower than the primary voltage, a power saving effect can be obtained.

In such a power saving device, since the circuit is not shorted even when the first and second switches S1 and S2 are closed at the same time, supply of electricity is stopped when switching the opening and closing of the first and second switches S1 and S2. The problem can be solved, but there is a problem that the first switch S1 for energizing the external primary voltage to operate the load L must be considerably large. That is, the first switch S1 is mainly manufactured as a magnetic switch, but because of its large volume, the overall size of the power saving device is increased, and the manufacturing cost of the power saving device is increased.

In order to overcome the problems of the conventional FIGS. 1 and 2, the present invention proposes a household power saving device as shown in FIG.

The power saving device according to the prior art and the power saving device according to the present invention have a slightly different operation process, that is, the power saving device according to the prior art has a load related to a discharge lamp and the like. Although the opening and closing of the switch S1 and the second switch S2 is determined, the power saving device according to the present invention is to set the switch appropriately in advance for the home user, and, of course, the switch by the timer according to the power usage time and season. Switch control by control and control is also possible.

In the power saving device according to the present invention, as shown in FIG. 3, the first relay Ry 1, the second relay Ry 2, and the plurality of switches S11, S12, S13, and S14 are connected to the single winding transformer of FIG. 1. In addition, the protection circuit 11 and the harmonic elimination circuit 15 are added and improved.

3 illustrates a power saving device according to the present invention, and FIGS. 4 to 7 illustrate the operation state of the power saving device according to an embodiment of the present invention.

The power saving device 10 shown in FIG. 3 includes a coil C11 disposed in parallel with the first and second power input terminals R and N and up or down the input voltage, and a lengthwise direction at one side of the coil C11. A plurality of input side taps T1 to T3 arranged along the side and selecting voltage levels input through the first power input terminal R, and in series between the first power input terminal R and the input side taps T1 to T3. A first selection switch S11 installed to be switched to a specific tap T1 to T3 by a timer or a control signal (not shown), and arranged on the other side of the coil C11 along the length direction, Between the plurality of output side taps T4 to T6 for outputting the voltages outputted through T1 to T3 and the coil C11 up or down, and between the output side taps T4 to T6 and the first power output terminal Out1. A second selection switch S12, which is provided in series and which is selectively switched to specific taps T4 to T6 by a control signal, and a front end of the coil C11; A first power saving mode switch S13 installed in parallel with the first and second power input terminals R and N and opened and closed according to a control signal to operate an input voltage in a power saving mode; and in series with the first power saving mode switch S13 A first relay Ry1 connected to the first power saving mode switch S13 to turn off or on the plurality of relay switches Ry1b1, Ry1b2, and Ry1a and a control signal connected in parallel with the first relay Ry1; According to the second power saving mode switch S14 for operating the input voltage in the power saving mode and the second power saving mode switch S14 in series, When the first power saving mode switch S13 is opened by being installed in series between the second relay Ry2 for turning off or on the Ry2b and Ry2a, and the first power input terminal R and the first power output terminal Out1. The first relay switch R closed to bypass the input voltage to the output terminal. y1b1) and the first power output terminal Out1 and the coil C11 are installed in parallel to each other so that they are energized when the first power saving mode switch S13 is opened to act as a function of shorting the coil C11. When the relay switch Ry1b1 is opened, the protection circuit unit 11 which temporarily suppresses the voltage drop of the input side taps T1 to T3 and the first and second power output terminals Out1 and Out2 are installed in parallel to each other. Harmonic elimination section 15, which removes harmonic currents and compensates for the power factor.

In addition, the power saving device 10 is installed between the end of the coil C11 and the second power supply terminal (N, Out2 line), and is turned on / off in accordance with the on / off of the first relay Ry1 to supply the coil. Is installed between the third relay switch Ry1a and the third relay switch Ry1a and the second power supply terminals N and Out2 lines, and are turned on / off in accordance with the on / off of the second relay Ry2. A fourth relay switch Ry2b for electrically connecting the coils, and a predetermined tap T7 of the coil C11 and a second power supply terminal (N, Out2 line) to be turned on / off of the second relay Ry2; A fifth relay switch Ry2a, which is turned on / off according to the off and finely adjusts the input voltage, may be further provided, and a relay switch may be further added as necessary.

As shown in FIG. 3, the harmonic removing unit 15 has a coil C11 and a capacitor C1 connected in series, and the protection circuit unit 11 is closed when the first relay Ry1 is opened and the first relay is closed. A second relay switch Ry1b2 interlocked with the switch Ry1b1 and a resistor R1 connected in series with the second relay switch Ry1b2.

The pair of first and second power input terminals R and N are connected to an external power source E as shown by a dotted line, and the other pair of first and second power output terminals Out1 and Out2 are housed. It is connected to each electric load (L).

Here, since the coil C11 functions as a single winding transformer, the first relay switch Ry1b1 is closed when the first power saving mode switch S13 is opened, that is, at the initial stage of driving, and is input from the outside. The power supply voltage is bypassed through the first relay switch Ry1b1 without flowing to the coil C11 and is supplied to the load without a change in the voltage.

Subsequently, when the first power saving mode switch S13 is closed by a timer or a control signal, power is supplied to the first relay Ry1 to open the first relay switch Ry1b1 and the second relay switch Ry1b2, and The power supply voltage is boosted or decompressed through the first selection switch S11, the preselected tap T1, T2 or T3, the coil C11, the preselected tap T4, T5 or T6 and the second selection switch S12. It is supplied to the load (L).

At this time, when the second power saving mode switch S14 is closed by a timer or a control signal, power is supplied to the second relay Ry2 to close the fifth relay switch Ry2a and output through the second selection switch S12. The voltage to be reduced is further reduced to be supplied to the load (L).

Typically, 220V or 110V voltage is applied to two homes (R, N) among three-phase four wires (R, T, S, N), and the voltage applied to each home is the same commercial voltage. It depends somewhat on the region.

For example, even if 220V is a commercial voltage, the voltage varies from region to region of about 207V to 233V, and if the voltage drawn into the home is slightly higher than approximately 230V, ± 10 for an electric device having a rated voltage of 220V It is designed so that there is no abnormality in use within the voltage range of 198V to 242V, which is%, even if the voltage supplied to the home is lowered from 230V to 200V, and about 30V is further reduced, there is no problem in the operation of the electric equipment.

4 to 7 is an exemplary view briefly showing the power control state according to the input voltage according to the present invention, referring to the drawings as follows.

4 illustrates a case where the output voltage is 210V and the voltage drops 20V when the input voltage is 230V. Each of the taps T1 to T3 and T4 to T6 is preset to drop or rise by 10V.

First, the first selection switch S11 is connected to the first tap T1 by a timer or a control signal, and the second selection switch S12 is initially connected to the sixth tap T6. Power input from the outside is bypassed through the first relay switch Ry1b1 and applied to the output terminal.

At this time, when the first power saving mode switch S13 is turned on by a timer or a control signal, power is supplied to the first relay Ry1. Then, the first relay switch Ry1b1 and the second relay switch Ry1b2 are connected to the first one. Simultaneously turned off according to the turn-on of the relay Ry1, the 230V input power is supplied to the first selection switch S11, the first tap T1, the coil C11, the sixth tap T6, and the second selection switch ( A voltage drop of 20V is generated through S12), and a voltage of 210V is output through the output terminal.

In this case, in order to further reduce the power supplied to the load L, the second power saving mode switch S14 may be closed by a timer or a control signal. By supplying power to the second relay Ry2 and conducting the fifth relay switch Ry2a, the voltage output through the second selection switch S12 may be further reduced to supply the load L.

In addition, according to the operation of the second relay Ry2, the fifth relay switch Ry2a is closed so that the tab T7 of the coil C11 forms a closed loop electrically with the second power terminal.

Of course, the first to fourth switches S11, S12, S13, and S14 are configured as solid state relays (SSRs), and thus, taps T1 to T6 of the coil C11 by a predetermined timer or control means (not shown). By controlling the switching, the voltage output through the coil C11 may be automatically adjusted for each time period or season.

For example, when the voltage drawn into the home is rather high, about 230V, the voltage drawn in is 210V because it is designed so that there is no abnormality in use within the voltage range of 198V to 242V, which is ± 10% in electrical equipment with a rated voltage of 220V. Even lowering the voltage by about 20V will not cause any problems in the operation of the electric equipment.

5 illustrates a case in which the output voltage is 210V and the voltage drops 10V when the input voltage is 220V. Each of the taps T1 to T3 and T4 to T6 is preset to drop or rise by 10V.

First, in the state where the first selection switch S11 is connected to the second tap T2 by a timer or a control signal, and the second selection switch S12 is connected to the sixth tap T6, Power input from the outside is bypassed through the first relay switch Ry1b1 and applied to the output terminal.

At this time, when the first power saving mode switch S13 is turned on by a timer or a control signal, power is supplied to the first relay Ry1. Then, the first relay switch Ry1b1 and the second relay switch Ry1b2 are connected to the first one. It is sequentially turned off according to the turn-on of the relay Ry1, and the 220V input power is the first selection switch S11, the second tap T2, the coil C11, the sixth tap T6, and the second selection switch. A voltage drop of 10V is generated through S12 to output a voltage of 210V through the output terminal.

In addition, when the third relay switch Ry1a is closed according to the operation of the first relay Ry1 and the second power saving mode switch S14 is turned off, the fourth relay switch Ry2b is closed and the coil C11 is closed. ) Is electrically connected to the second power supply terminal.

6 illustrates a case in which the output voltage is increased to 220V and 20V when the input voltage is 200V. Each of the taps T1 to T3 and T4 to T6 is preset to drop or increase by 10V.

First, the first selection switch S11 is connected to the third tap T3 by a timer or a control signal, and the second selection switch S12 is initially connected to the fourth tap T4. Power input from the outside is bypassed through the first relay switch Ry1b1 and applied to the output terminal.

At this time, when the first power saving mode switch S13 is turned on by a timer or a control signal, power is supplied to the first relay Ry1. Then, the first relay switch Ry1b1 and the second relay switch Ry1b2 are connected to the first one. It is temporarily turned off according to the turn-on of the relay Ry1, and the 200V input power is supplied to the first selection switch S11, the third tap T3, the coil C11, the fourth tap T4, and the second selection switch. A voltage increase of 20V is generated through S12 to output a voltage of 220V through the output terminal.

FIG. 7 illustrates a case where the output voltage is increased to 220V and 10V when the input voltage is 210V. Each of the taps T1 to T3 and T4 to T6 is preset to drop or increase by 10V.

First, the first selection switch S11 is connected to the second tap T2 by a timer or a control signal, and the second selection switch S12 is initially connected to the fourth tap T4. Power input from the outside is bypassed through the first relay switch Ry1b1 and applied to the output terminal.

At this time, when the first power saving mode switch S13 is turned on by a timer or a control signal, power is supplied to the first relay Ry1. Then, the first relay switch Ry1b1 and the second relay switch Ry1b2 are connected to the first one. It is temporarily turned off according to the turn-on of the relay Ry1, and the 210V input power is supplied to the first selection switch S11, the second tap T2, the coil C11, the fourth tap T4, and the second selection switch. A voltage increase of 10V is generated through S12 to output a voltage of 220V through the output terminal.

The input voltage is lowered or raised in the above manner, and the operation contents according to the select taps T1 to T3 and T4 to T6 for each switch are shown in the following table.

As shown in Table 1, the input voltage may be bypassed, lowered from 10V to 20V, or increased from 10V to 20V depending on the connection position of the first select switch S11 and the second select switch S12.

As described above, the first and second selection switches S11 and S12 may be selected and set in advance according to the input voltage and the desired voltage, and the first and second selection switches may be set by a timer or a control signal according to a time zone. S11 and S12 may be switched to an appropriate position.

The first power saving mode switch S13 may use a relay switch owned by the first relay Ry1 by operating the first relay Ry1. When the first relay Ry1 is turned on, the first and second relays may be used. The switches Ry1b1 and Ry1b2 are open, and the first relay switch Ry1b1 has a function of bypassing the output terminal without changing the input voltage when the first relay Ry1 is turned off.

The second relay switch Ry1b2 uses a resistor R1 to bring the reactance of the circuit close to zero, thereby paralyzing the induction magnetic performance of the portions of the taps T1 to T6 called the current coils C11.

The first selection switch S11 may select a position connected to the taps T1 to T3 to match the input voltage, and the second selection switch S12 may select in advance to match the input voltage and the desired voltage. Can be.

The energy saving device of the present invention configured as described above, the size of the transformer is reduced by about 1/3 because the winding method of the present invention is a 230V transformer winding method compared to the conventional 600V to 700V voltage transformer winding method, and also a single winding transformer By constructing a power saver using, it is possible to significantly reduce the size of the transformer than when using a lottery transformer.

In addition, the protection circuit unit 11 made of the resistor R1 is provided on the output end side of the coil C11, so that the instantaneous counter electromotive force attenuation and zero-crossing effect can be selected, and an extremely short time when the first relay switch Ry1b1 is opened. The resistance R1 through the second relay switch Ry1b2 cancels the induced electromotive force to prevent the voltage drop of the coil C11. In addition, by using the inductor (L1) and the capacitor (C1) by having a harmonic rejection unit 15 at the output terminal, it is possible to increase the reliability of the output voltage by adding a harmonic current attenuation and power factor compensation function with appropriate reactance and capacitance.

Although specific embodiments of the present invention have been described and illustrated above, the present invention may vary the voltage set on the taps, such as increasing or decreasing the number of taps of the coil, installing a number of switches corresponding to the number of taps of the coils as necessary. Changes to the design, for example, are obvious. Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

Therefore, in the present invention, by designing an improved circuit of the conventional single winding transformer, it is possible to prevent a momentary power failure due to switch switching when switching to the power saving mode, and also to implement a power saving device using a single winding transformer to implement a lottery transformer Compared to this, the use coil can be reduced, and the production cost can be lowered. In addition, the protection circuit and harmonic elimination circuit of the output stage prevent the sudden voltage drop through the transformer, and eliminate the output harmonics and power factor. Compensation has the advantage of increasing the reliability of the output voltage.

1 is a power saving device using a single winding transformer according to the prior art,

2 is a power saving device using a lottery transformer according to the prior art,

3 is a circuit diagram showing a power saving device using a single winding transformer according to the present invention;

4 to 7 are exemplary views briefly showing a power control state according to an input voltage according to an embodiment of the present invention.

      * Explanation of symbols for the main parts of the drawings

10: power control sleeper C11: coil

S11: first selector switch S12: second selector switch

S13: first power saving mode switch Ry1: first relay

Ry1b1: first relay switch Ry1b2: second relay switch

Ry1a: third relay switch S14: second power saving mode switch

Ry2: second relay Ry2b: fourth relay switch

Ry2a: Fifth Relay Switch 11: Protection Circuit

15: Harmonic elimination part R: first power input terminal

N: second power input terminal Out1: first power output terminal

Out2: 2nd power output stage

Claims (4)

A single coil C11 disposed between the first and second power input terminals R and N and the first and second power output terminals Out1 and Out2 to boost or reduce the input voltage; A plurality of input side tabs T1 to T3 arranged on one side of the coil to select a level of a voltage input through a first power input terminal; A first selection switch (S11) installed in series between the first power input terminal and the input side tab and selectively switching to a specific tap by a control signal; A plurality of output side taps (T4 to T6) arranged on the other side of the coil in a lengthwise direction to boost or reduce the voltage output through the input side tap and the coil; A second selection switch (S12) disposed in series between the output side tab and the first power output terminal and selectively switching to a specific tap by a control signal; A first power saving mode switch (S13) installed in parallel to the first and second power input terminals and opened and closed according to a control signal to operate the input voltage in a power saving mode; A resistor (R1) disposed between the first power output terminal and the end of the coil to attenuate the instantaneous counter electromotive force by the coil; A first relay Ry1 connected in series with the first power saving mode switch and operated when the first power saving mode switch is turned on; A first relay switch Ry1b1 disposed in series between the first power input terminal and the first power output terminal and turned on or off by an operation of the first relay Ry1; A second relay switch Ry1b2 disposed between the first power output terminal and one end of the resistor and turned on or off by an operation of the first relay Ry1; And A third relay switch (Ry1a) installed between an end of the coil and the second power output terminal and turned on or off by an operation of the first relay Ry1; When the first power saving mode switch S13 is in an off state, the first and second relay switches Ry1b1 and Ry1b2 are turned on, and the third relay switch Ry1a is turned off, and the input voltage is bypassed to the output terminal. Become, When the first power saving mode switch S13 is in an on state, power is supplied to the first relay Ry1 so that the first and second relay switches Ry1b1 and Ry1b2 are turned off, and the third relay switch Ry1a is turned on, and the input voltage is boosted or reduced through the first selector switch S11, the input taps T1 to T3, the coil C11, the output taps T4 to T6, and the second selector switch S12. Power control power saving device for home using a single winding transformer, characterized in that the supply to the output stage. delete The method of claim 1, The first and second power output terminal, the power control device for home power control using a single winding transformer, characterized in that it further comprises a harmonic removing unit consisting of a series circuit of an inductor (L1) and a capacitor (C1). The method of claim 1, A second power save mode switch S14 connected in parallel with the first relay Ry1 and opened / closed according to a control signal to operate an input voltage in a power save mode; A second relay Ry2 connected in series with the second power saving mode switch S14 and operated when the second power saving mode switch is turned on; A fourth relay switch Ry2b installed in series between an end of the coil and the second power input terminal and turned on or off by an operation of the second relay Ry2; And A fifth relay switch Ry2a disposed between a predetermined tap T7 of the coil and the second power input terminal and turned on or off by an operation of the second relay Ry2; When the second power save mode switch S14 is in an on state, power is supplied to the second relay Ry2 so that the fourth relay switch Ry2b is turned off and the fifth relay switch Ry2a is turned on. And the input voltage is further reduced based on the predetermined tap and output through the second selection switch (S12).