JP2003230227A - Power saving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To subject alternating-current input to voltage control or power control to supply a load with the input with reduced alternating current and further prevent erroneous connection of input terminals and output terminals. <P>SOLUTION: A power saving device comprises a current detector 11 which generates alternating current detection signals representing output current supplied from a power regulating portion 4 to a load 2; and a voltage detector 13 which generates alternating- current voltage detection signals representing alternating-current voltage applied from the power regulating portion 4 to the load 2. The power saving device further comprises a multiplier 14 which multiplies an alternating current detection signal by an alternating-current voltage detection signal and outputs a power detection signal representing power supplied to the load; a comparator 15 which compares a power detection signal with a reference value to judge whether the power detection signal is a positive signal or a negative signal, and judges the input/output terminals to be normally connected if the power detection signal is positive and the input/output terminals to be reversely connected if the power detection signal is negative; and a connection display unit 32 which indicates whether the input/output terminals are connected normally or abnormally according to a judgment signal from the comparator 15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power saving device which supplies a load with reduced alternating current by controlling voltage or power of an alternating current input. In particular, it is intended to prevent accidental connection of the input terminal and the output terminal.

[0002]

2. Description of the Related Art In recent years, 24-hour stores such as convenience stores and gas stations have been increasing. Along with this, power saving devices that reduce power consumption to save power have attracted attention.
In a conventional power saving device, as shown in FIG. 2, a plurality of output adjusting taps are provided in an auto transformer 50, and switch parts 51a, 51b, 51c connected to the taps are switched to reduce the output capacitance to a fraction of one of the output capacities. There are known a power saving device 3a for reducing the capacity as an adjustment range, an AC chopper type power saving device as shown in FIG. 3, and a bridge type inverter power saving device as shown in FIG.

An AC chopper type power saving device is a switching device formed by abnormally connecting a diode, for example, 61b, and a semiconductor switching element, for example, 61a.
Two sets of switching circuits, in each of which 61 and 62 are connected in series in the opposite direction, are provided. One of the two sets is connected in series with the primary winding 67a of the transformer 67, and the other set is connected in parallel with the primary winding 67a of the transformer 67. Further, the secondary winding 67b of the transformer 67 is connected in series with the load 2 such as a lamp to lower the capacity as an adjustment range of a fraction of the output capacity.

A bridge type inverter as shown in FIG. 4 is a switching device in which two switching devices, for example 71, 72, are formed by connecting a diode, for example 71b, and a semiconductor switching element, for example 71a, in an abnormal manner. Three sets of circuits are provided in parallel, and a capacitor 77 is provided in parallel. Further, an input terminal for connecting an AC power supply to a connection point between the semiconductor switching devices 71 and 72 of the first switching circuit and a connection point between the semiconductor switching devices 73 and 74 of the second switching circuit via a reactor 78a. And a switching device 71-74 to form a converter for improving the power factor. Connect the connection point between the switching devices 73 and 74 of the second switching circuit and the connection point between the semiconductor switching devices 75 and 76 of the third switching circuit to the output terminal that connects the load via the reactor 79a. An inverter is configured by the switching devices 73 to 76, and the capacity is lowered as an adjustment range of a fraction of the output capacity.

[0005]

However, in the power saving device of the auto transformer system shown in FIG. 2, the power saving device of the AC chopper system shown in FIG. 3, and the power saving device of the bridge type inverter shown in FIG. 4, the output terminals 6a, 6b are provided. Even if the input AC power source 1 is mistakenly connected to the input terminal and the load 2 is connected to the input terminals 5a and 5b, the AC power source is supplied to the control device 52 or 68, and the switch unit 51 shown in FIG. The switching elements 61a to 64a or 71a to 76a shown in FIG. 4 may operate. Therefore, an overvoltage obtained by boosting the AC voltage of the AC power supply may be applied to the load 2 to damage the load. In addition, the power saving device has an input current of several tens.
In the case of A or higher, the terminal block was used for the input / output terminals 5a, 5b, 6a, 6b, and the input / output terminals could be erroneously connected.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 uses a single-phase AC power supply as an input,
The electric power adjustment part which controls and outputs the voltage of the said single phase alternating current power supply is provided. A current detector that generates an alternating current detection signal that represents the output current that is supplied from the power adjustment unit to the load, and an output that generates an alternating voltage detection signal that is an output that represents the alternating voltage applied to the load from the power adjustment unit. And a voltage detector. Also, a multiplier that multiplies the AC current detection signal and the AC voltage detection signal to generate a power detection signal representing the power supplied to the load, and the power detection signal is compared with a reference value, for example, 0, It is determined whether the power detection signal is a positive signal or a negative signal. When the power detection signal outputs a positive signal, it is determined that the connection of the input / output terminal of the power saving device is normal, and when it outputs a negative signal, the input / output terminal. And a connection display device that displays a normal connection or an abnormal connection of the input / output terminals according to the determination signal of the comparator.

According to this power saving device, the power detection signal of the multiplier outputs a positive signal when the connection of the input / output terminals is normal connection, and the power detection signal of the multiplier is negative signal when the connection is abnormal. Is output. Therefore, when the power detection signal of the multiplier outputs a negative signal, the connection display device indicates that the connection of the input / output terminals is abnormal. By correcting this erroneous connection, the overvoltage obtained by boosting the AC voltage of the AC power supply is not applied to the load, and the load is not damaged.

The invention according to claim 2 is provided with a power adjusting section which receives the single-phase AC power supply as an input and controls and outputs the voltage of the single-phase AC power supply. It is connected between the input terminals of the power adjustment unit, and is connected between the input voltage detector that generates an input AC voltage detection signal representing the AC voltage applied from the AC power supply to the power adjustment unit and the output terminal of the power adjustment unit. And an output voltage detector that generates an output AC voltage detection signal that represents an AC voltage applied to the load from the power adjustment unit. An AC voltage detection signal of the input before adjustment, and a pre-adjustment voltage storage device that stores the AC voltage detection signal of the output and outputs a pre-adjustment voltage storage signal, the AC voltage detection signal of the input after adjustment, The adjusted voltage storage device that stores the output AC voltage detection signal and outputs the adjusted voltage storage signal, compares the input pre-adjustment voltage storage signal and the input adjusted voltage storage signal, and The pre-adjustment voltage storage signal and the output post-adjustment voltage storage signal are compared, and it is determined whether the connection is normal or abnormal based on the voltage fluctuation between the input AC voltage and the output voltage of the power adjustment unit, and the determination signal is output. The abnormal connection discriminating device and the connection display device for displaying the normal connection or the abnormal connection of the input / output terminals of the power saving device according to the discrimination signal of the abnormal connection discriminating device.

According to this power saving device, if the connection of the input / output terminals is normal, the abnormal connection discriminating device discriminates the appropriateness of the voltage fluctuation between the input AC voltage and the output voltage of the power adjusting section. If the connection of the input / output terminals is abnormal, the abnormal connection determination device determines that the voltage fluctuation between the input AC voltage and the output voltage of the power adjusting unit is not appropriate. When a signal indicating that the voltage fluctuation is not appropriate is output, the connection display device indicates that the connection of the input / output terminals is abnormal. This corrects this incorrect connection,
An overvoltage obtained by boosting the AC voltage of the AC power supply is not applied to the load, and the load is not damaged.

The invention according to claim 3 is provided with a power adjusting section for inputting a single-phase AC power supply and controlling and outputting the voltage of the single-phase AC power supply. An input voltage detector that is connected between the input terminals of the power adjustment unit and that generates an input AC voltage detection signal that represents an AC voltage applied to the power adjustment unit from an AC power supply, and is supplied from the power adjustment unit to the load. A current detector for generating an alternating current detection signal representing an output current, and an output voltage detector for generating an output alternating voltage detection signal representing an alternating voltage applied to the load from the power adjusting unit. Further, the AC current detection signal is multiplied by the AC voltage detection signal to generate a power detection signal representing the power supplied to the load, and the power detection signal is detected by comparing the power detection signal with a reference value. It is determined whether the signal is a positive signal or a negative signal, and when the power detection signal outputs a positive signal, the connection of the input / output terminals of the power saving device is determined to be normal connection, and when the negative signal is output, the input / output terminal connection And a comparator for discriminating an abnormal connection. An AC voltage detection signal of the input before adjustment, and a pre-adjustment voltage storage device that stores the AC voltage detection signal of the output and outputs a pre-adjustment voltage storage signal, the AC voltage detection signal of the input after adjustment, The adjusted voltage storage device that stores the output AC voltage detection signal and outputs the adjusted voltage storage signal, compares the input pre-adjustment voltage storage signal and the input adjusted voltage storage signal, and The pre-adjustment voltage storage signal and the output post-adjustment voltage storage signal are compared, and it is determined whether the connection is normal or abnormal based on the voltage fluctuation between the input AC voltage and the output voltage of the power adjustment unit, and the determination signal is output. And an abnormal connection discriminating device. Further, a connection display device is provided for displaying whether the connection of the input / output terminals of the power saving device is normal connection or abnormal connection according to the determination signal of the comparator or the abnormal connection determination device.

According to this power saving device, even when a load is connected to the power saving device or when there is no load,
Make sure to judge whether the output connection is normal or incorrect.
You can display it.

According to a fourth aspect of the present invention, the output of the abnormal connection discriminating device lacks the adequacy of the voltage fluctuation between the input AC voltage and the output voltage of the power adjusting section, and the connection of the input / output terminals is abnormal. When the connection is output, the power adjustment unit is reset by the output signal of the abnormal connection determination device, and when a predetermined number of output signals of the abnormal connection determination device are counted, the connection of the input / output terminal is abnormal on the connection display device. It is provided with a counter for issuing a connection display command.

Before and after the operation of the power saving device, the input AC voltage may fluctuate, and abnormal connection may be expected even though the power saving device is normally connected. After detecting an abnormal connection, this power saving device resets and restarts the power saving device. When the count of abnormal connections reaches a predetermined number, the counter instructs the connection display device to display on the connection display device that the connection of the input / output terminals is abnormal. Accordingly, when the connection of the input / output terminals is abnormal, the abnormal connection can be surely displayed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. Reference numeral 1 is an input single-phase AC power source, 2 is a load such as a lamp, and 4 is a power adjusting unit of a power saving device 3 such as an autotransformer and a switch unit, an AC chopper circuit, and a bridge type inverter type which have been conventionally used. Input terminals 5a and 5b of the power saving device 3 are connected to the AC power supply 1. 6
Outputs a and 6b are connected to the load 2 at their outputs. Reference numeral 7 is a control device for controlling the switches and switching elements of the power adjustment unit 4 of the power saving device 3, which includes an input terminal 5a,
It is connected to 5b.

The power saving device 3 includes first and second input / output incorrect connection detection devices 10 and 20. A current detector 11 is provided on the primary winding 4b of the transformer 4a in the power adjusting unit 4. The output current (load current) supplied from the power adjustment unit 4 of the power saving device 3 to the load 2 and the primary winding 4b of the transformer 4a.
The current detector 11 generates an AC current detection signal that represents the output current supplied from the power adjustment unit 4 of the power saving device 3 to the load 2 because the current flowing in the load current is proportional. The current detector 11 is connected to the output of the power adjustment unit 4 and the output terminal 6 of the power saving device.
It is provided between a and 6b to directly detect the current flowing through the load 2,
The alternating current detection signal may be generated. Similarly, the output voltage detector 13 is connected between the output terminals 6a and 6b. The output voltage detector 13 is the power adjustment unit 4 of the power saving device 3.
To generate an AC voltage detection signal of an output representing an AC voltage (load voltage) applied to the load 2.

The level of the AC current detection signal from the current detector 11 is adjusted by the level adjuster 12,
It is supplied to the multiplier 14. The output AC voltage detection signal from the output voltage detector 13 is also supplied to the multiplier 14, and the multiplier 1
4, the AC current detection signal and the output AC voltage detection signal are multiplied. Therefore, the output of the multiplier 14 becomes a power detection signal representing the power (load power) supplied to the load 2. Reference numeral 15 is a first comparator, which includes the power detection signal and
A reference signal that can determine whether the power detection signal is a positive signal or a reverse signal, for example, a reference value 0 is input, and the input power detection signal and the reference signal are compared, that is, a reference signal from the power detection signal. Is subtracted to determine whether the power detection signal is a positive signal or a negative signal. if,
When the power detection signal is positive, 0 is output, and when it is negative, a logic 1 is output. According to this logic 0 or 1, the power saving device 3 is connected to the AC power source 1 at the input terminals 5a and 5b and is connected to the load 2 at the output terminals 6a and 6b, or as shown by the broken line in FIG. It is determined whether the load 2 is connected to 5a and 5b and the AC power supply 1 is connected to the output terminals 6a and 6b. The discrimination signal of the comparator 15 is used to command the display of the connection display device 32, which will be described later. First above
The incorrect input / output connection detection device 10 includes a current detector 11, a level adjuster 12, an output voltage detector 13, a multiplier 14, and a first comparator 15.

Since the first incorrect input / output connection detecting device 10 detects the output current, the condition is that the load is always connected. However, it is necessary to determine whether the input / output connection is normal or erroneous even when there is no load. For this purpose, the second input / output incorrect connection detection device 20 is provided. Next, the second input / output incorrect connection detection device 20
Will be described.

An input voltage detector 21 is connected between the input terminals 5a and 5b. The input voltage detector 21 generates an input AC voltage detection signal representing an AC voltage (input voltage) applied from the input AC power supply 1 to the power adjustment unit 4 of the power saving device 3. The output voltage detector 22 is connected between the output terminals 6a and 6b. The output voltage detector 22 generates an output AC voltage detection signal representing an AC voltage (load voltage) applied to the load 2 from the power adjustment unit 4 of the power saving device 3. The input AC voltage detection signal is the pre-adjustment voltage storage device 23.
The input voltage storage device 23a before adjustment and the input voltage storage device 24a after adjustment of the adjusted voltage storage device 24 are applied. The output AC voltage detection signal is applied to the pre-adjustment output voltage storage device 23b of the pre-adjustment voltage storage device 23 and the post-adjustment output voltage storage device 24b of the post-adjustment voltage storage device 24.

Immediately before the power saving device 3 is started, a start signal (not shown) is not input to the power adjusting section 4, and
Switching means 4d provided in parallel with the primary winding 4b of the transformer
Are short-circuited. Therefore, the input voltage and the output voltage of the power saving device 3 are substantially equal to each other. Pre-adjustment voltage storage device 2 to which both input and output AC voltage detection signals are input
3 stores that the input AC voltage detection signal and the output AC voltage detection signal have substantially the same voltage.

When the opening / closing means 4d is opened and a start signal is input to the power adjusting section 4 to start the power adjusting section 4, both the input and output AC voltage detection signals are input to the adjusted voltage storage device 24. Stores the input AC voltage detection signal and the output AC voltage detection signal.

The storage signal of the pre-adjustment input voltage storage device 23a and the storage signal of the post-adjustment input voltage storage device 24a are subtracted by the subtractor 26a. Further, the storage signal of the pre-adjustment output voltage storage device 23b and the storage signal of the post-adjustment output voltage storage device 24b are subtracted by the subtractor 26b. Subtractor 2
The subtraction signals subtracted by 6a and 26b are converted into absolute values by absolute value circuits 27a and 27b, respectively.

The two subtracted signals whose absolute values have been converted are compared by the second comparator 28 to determine whether the output of the absolute value circuit 27a on the input side is higher or lower than the output of the absolute value circuit 27b on the output side. It If the absolute value circuit 27a on the input side
When the output of is higher than the output of the absolute value circuit 27b on the output side, a logic 0 is output, and when it is low, a logic 1 is output. The logic 0 or 1 causes the power saving device 3 to input 5
AC power source 1 is connected to a and 5b, and output terminals 6a and 6b
It is determined whether the load 2 is connected to the input terminal 5 or the load 2 is connected to the input terminals 5a and 5b and the AC power source 1 is connected to the output terminals 6a and 6b as shown by the broken line in FIG. The discrimination signal of the comparator 15 is used to instruct the display of the connection display device 32, which will be described later.

The subtractor 26a, 26b, the absolute value circuits 27a, 27b, and the second comparator 28 constitute the abnormal connection discriminating device 25. As described above, the input pre-adjustment voltage storage signal and the input post-adjustment voltage storage signal are adjusted. The voltage storage signal is compared and subtracted, and the output pre-adjustment voltage storage signal and the output post-adjustment voltage storage signal are compared and subtracted. The subtracted subtracted signal is subjected to absolute value conversion, and the absolute value converted signal on the input side and the absolute value converted signal on the output side, which have been absolute value converted, are compared. By comparing the absolute value conversion signal on the input side with the absolute value conversion signal on the output side, in the case of normal connection, the voltage fluctuation of the output voltage of the power adjustment unit becomes larger than the voltage fluctuation of the input AC voltage. Also, in the case of an abnormal connection, it will be smaller. Whether the connection is normal or abnormal is determined based on the magnitude of this voltage fluctuation, and the determination signal is output. In addition, the pre-adjustment voltage storage device 23, the post-adjustment voltage storage device 24, the abnormal connection determination device 25, and the counter, which will be described later, constitute a second input / output incorrect connection detection device 20.

Next, the AC voltage of the AC power source 1 before adjustment is
For example, at 110V, the AC voltage 10 of the adjusted AC power source 1 is adjusted.
The case where the voltage drops to 0V will be described. If the output A of the pre-adjustment input voltage storage device 23a outputs 110 of the AC voltage 110V, the output B of the pre-adjustment output voltage storage device 23b also outputs 110 of the AC voltage 110V.

Here, the input terminals 5a, 5b of the power saving device 3
The AC power supply 1 is connected to the output terminals 6a and 6b, and the load 2
In the case of a normal connection, the output C of the adjusted input voltage storage device 24a outputs 110 of the AC voltage 110V, and the output D of the adjusted output voltage storage device 24b outputs 100 of the AC voltage 100V. . As a result, the output E of the subtractor 26a on the input side is 0, the output F of the subtractor 26b on the output side is 10, the output G of the absolute value circuit 27a on the input side is 0, and the absolute value circuit 27b of the output side is Output H is 10. That is, the output H of the absolute value circuit 27b on the output side becomes higher than the output G of the absolute value circuit 27a on the input side.

Further, as shown by the broken line in FIG. 1, in the case of an abnormal connection in which the load 2 is connected to the input terminals 5a and 5b of the power saving device 3 and the AC power source 1 is connected to the output terminals 6a and 6b, adjustment is made. The output C of the rear input voltage storage device 24a outputs 120, and the output D of the adjusted output voltage storage device 24b outputs 11
Outputs 0. As a result, the output E of the input-side subtractor 26a is 10, the output F of the output-side subtractor 26b is 0, the output G of the input-side absolute value circuit 27a is 10, and the output-side absolute value circuit 27b. Output H becomes 0. in this case,
The output H of the absolute value circuit 27b on the output side becomes lower than the output G of the absolute value circuit 27a on the input side.

The second comparator 28 is an absolute value circuit 2 on the input side.
The output G of 7a and the output H of the absolute value circuit 27b on the output side are compared, and when the output G of the absolute value circuit 27a on the input side is higher than the output H of the absolute value circuit 27b on the output side, a logic 0 is output, When the output G of the absolute value circuit 27a on the input side is lower than the output H of the absolute value circuit 27b on the output side, a logic 1 is output. As described above, when the second comparator outputs logic 0, the AC power supply 1 and the load 2 are normally connected to the power saving device 3, and when outputting the logic 1, the power saving device 3 is connected to the AC power supply. 1 and the load 2 are connected in reverse.

On the other hand, the AC voltage of the AC power source 1 before adjustment is
For example, at 90V, the AC voltage of the AC power supply 1 after adjustment is 100
When the voltage is increased to V and normally connected, the output E of the subtractor 26a on the input side is 0, the output F of the subtractor 26b on the output side is −10, and the output H of the absolute value circuit 27b on the output side is Outputs 10. In other respects, the operation is similar to the case where the AC voltage of the AC power supply 1 before the adjustment drops after the adjustment. Then, in the case of normal connection, the output H of the output side absolute value circuit 27b becomes higher than the output G of the input side absolute value circuit 27a, and in the case of abnormal connection, the output H of the output side absolute value circuit 27b is input. Output G of the absolute value circuit 27a on the side
Will be lower than.

By the way, before and after the operation of the power saving device 3, the input AC voltage may fluctuate, and it may be expected that the connection is determined to be abnormal even though the power saving device is normally connected. In order to prevent such an erroneous determination due to instantaneous fluctuations before and after the operation of the power saving device 3, after the abnormal connection is detected, the reset device 30 is instructed to reset and restart the power saving device 3. A counter 29 counts a predetermined number of logic 1 of abnormal connection of the comparator 28. If, for example, 3 times are counted, the counter 29 indicates that the logic 1 is the abnormal connection of the second input / output incorrect connection detection device 20. Output.

The output of the first input / output misconnection detection device 10 and the output of the second input / output misconnection detection device 20 are input to an OR circuit 31 composed of diodes 31a and 31b, and a large output is selected. Is input to the connection display device 32. The display of the connection display device is performed by means of a display lamp, a buzzer, an electronic character display, an electronic sound display, a notification, and an alarm. Then, when a load is connected to the input terminal of the power saving device and an AC power source is connected to the output terminal, an abnormal connection is displayed.

In the above embodiment, the output voltage detector has 13
2 and 22 are provided, but either one may be provided.

[0032]

According to the power saving device of the present invention, even if the input terminal and the output terminal are erroneously connected, the erroneous connection is surely displayed. By correcting this erroneous connection, the overvoltage obtained by boosting the AC voltage of the AC power supply is not applied to the load, and the load is not damaged.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing an embodiment of the present invention.

FIG. 2 is a conventional block circuit diagram.

FIG. 3 is a conventional block circuit diagram.

FIG. 4 Conventional circuit diagram

[Explanation of symbols]

1 AC power supply 2 load 3 power saving device 4 Power adjustment unit 4a transformer 4b Primary winding 4c secondary winding 4d opening and closing means 5a, 5b input terminals 6a, 6b output terminals 7 Control device 10 First I / O incorrect connection detection device 11 Current detector 12 Level adjuster 13 Voltage detector 14 Multiplier 15 (first) comparator 20 Second input / output incorrect connection detection device 21 Input voltage detector 22 Output voltage detector 23 Voltage storage device before adjustment 23a Input voltage storage device before adjustment 23b Output voltage storage device before adjustment 24 Adjusted voltage storage device 24a Input voltage storage device after adjustment 24b Adjusted output voltage storage device 25 Abnormal connection determination device 26a, 26b Subtractor 27a, 27b absolute value circuit 28 (Second) comparator 29 counter 30 reset device 31 OR circuit 31a, 31b Diode 32 Connection display device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Takiyama             6-2 61, Imafuku Nishi, Joto-ku, Osaka City, Osaka Prefecture               Matsushita Seiko Co., Ltd. (72) Inventor Masaru Nishizuka             3-56, Nishi-Awaji, Higashiyodogawa-ku, Osaka-shi, Osaka             Sansan Electric Co., Ltd. (72) Inventor Kazuo Suetsuba             3-56, Nishi-Awaji, Higashiyodogawa-ku, Osaka-shi, Osaka             Sansan Electric Co., Ltd. F-term (reference) 5H750 BA01 BA05 BA08 CC02 CC06                       CC12 CC14 DD27 EE04 GG02                       GG14

Claims (4)

[Claims] 1. A power-saving device having a power adjusting unit that receives a single-phase AC power supply as input and controls and outputs the voltage of the single-phase AC power supply, and represents an output current supplied from the power adjusting unit to a load. A current detector that generates an AC current detection signal, an output voltage detector that generates an AC voltage detection signal of an output that represents the AC voltage applied to the load from the power adjustment unit, the AC current detection signal and the AC voltage A multiplier that multiplies the detection signal to generate a power detection signal that represents the power supplied to the load, the power detection signal, and a reference signal that can determine whether the power detection signal is a positive signal or a reverse signal are input. , The input power detection signal and the reference signal are compared to determine whether the power detection signal is a positive signal or a negative signal, and when the power detection signal outputs a positive signal, the input / output terminal of the power saving device Connection When a normal connection is output as a negative, the comparator that determines the abnormal connection of the input / output terminal connection, and the connection display that displays the normal connection or abnormal connection of the input / output terminal according to the determination signal of the comparator And a device for saving power. 2. A power-saving device comprising a power adjusting unit for inputting a single-phase AC power supply and controlling and outputting a voltage of the single-phase AC power supply, wherein the AC power supply is connected between input terminals of the power adjusting unit. AC voltage applied to the load from the power adjustment unit, which is connected between an input voltage detector that generates an input AC voltage detection signal that represents an AC voltage applied to the power adjustment unit from the output terminal of the power adjustment unit. An output voltage detector that generates an AC voltage detection signal of an output that represents the above, an AC voltage detection signal of the input before adjustment, and an AC voltage detection signal of the output that is stored A voltage storage device, an adjusted voltage storage device that stores the adjusted input AC voltage detection signal and the output AC voltage detection signal, and outputs an adjusted voltage storage signal, and an input pre-adjustment voltage storage signal And of Normalized voltage storage signal is compared, and the output pre-adjustment voltage storage signal is compared with the output post-adjustment voltage storage signal, and normality is obtained from the voltage fluctuation between the input AC voltage and the output voltage of the power adjustment unit. An abnormal connection determination device that determines whether it is a connection or an abnormal connection and outputs the determination signal, and a connection display that indicates whether the connection of the input / output terminal of the power saving device is normal or abnormal by the determination signal of the abnormal connection determination device. And a device for saving power. 3. A power-saving device comprising a power adjusting unit for inputting a single-phase AC power supply and controlling and outputting a voltage of the single-phase AC power supply, wherein the AC power supply is connected between input terminals of the power adjusting unit. An input voltage detector that generates an input AC voltage detection signal that represents an AC voltage that is applied from the power adjustment unit to the power adjustment unit; and a current detection that generates an AC current detection signal that represents an output current supplied from the power adjustment unit to the load. And an output voltage detector that generates an AC voltage detection signal of an output that represents an AC voltage applied to the load from the power adjusting unit, a load on the load by multiplying the AC current detection signal and the AC voltage detection signal. By comparing the power detection signal with a multiplier that generates a power detection signal representing the supplied power and a reference value, it is determined whether the power detection signal is a positive signal or a negative signal, and the power detection signal is positive. Output If the connection of the input / output terminals of the power saving device is normal, and if the output of the negative is the abnormal connection of the input / output terminals, then a comparator is used, and the input AC voltage detection signal before adjustment A pre-adjustment voltage storage device that stores the output AC voltage detection signal and outputs a pre-adjustment voltage storage signal; a post-adjustment input AC voltage detection signal and an output AC voltage detection signal that are stored and adjusted A post-adjustment voltage storage device that outputs a voltage storage signal is compared with an input pre-adjustment voltage storage signal and an input post-adjustment voltage storage signal, and an output pre-adjustment voltage storage signal and an output post-adjustment voltage storage signal And an abnormal connection determination device that determines whether the connection is normal or abnormal based on the voltage fluctuation between the input AC voltage and the output voltage of the power adjustment unit, and outputs the determination signal, the comparator or the abnormality. On the connection determination device Power saving device according to claim the discrimination signal connection of the input and output terminals of the power saving device that a connection display device for displaying a normal connection or abnormal connection. 4. When the connection of the input / output terminal outputs an abnormal connection due to lack of validity of voltage fluctuation between the AC voltage of the input and the output voltage of the power adjustment unit, the output of the abnormal connection determination device outputs: A counter that resets the power adjustment unit by the output signal of the abnormal connection determination device, and when the output signal of the abnormal connection determination device counts a predetermined number, the connection of the input / output terminals issues an abnormal connection display command to the connection display device. The power saving device according to claim 2, further comprising: