JP3196884B2 - Power saving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a power saving device for suppressing power consumption of a load device by lowering a power supply voltage.

[0002]

2. Description of the Related Art Conventionally, a power saving device for suppressing power consumption of a load device by lowering a power supply voltage is as shown in FIG. The power saving device 21 connects the compound winding transformer TR3 to the AC electric circuit, switches the tap provided on the primary side of the compound winding transformer TR3 by using the switching means 22, and is induced in the secondary winding of the compound winding TR3. The output voltage is changed and supplied to the load device 23.

As a switching means for switching the tap of the compound transformer TR3, a contact switch such as a magnet contactor MC shown in FIG. 4 and a non-contact switch such as a thyristor switch SCR shown in FIG. 5 have been used.

[0004]

However, the above conventional power saving device adjusts the output voltage induced in the secondary winding according to the number of primary windings of the tap of the compound transformer TR3. There is a disadvantage that the output voltage cannot be adjusted steplessly. Further, when a contact switch is used as a means for switching the tap of the compound transformer TR3, switching noise occurs, and this switching noise is output from the secondary side of the compound transformer TR3, which causes a load device to malfunction. Had an adverse effect.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional power saving device, it is an object of the present invention to be able to continuously adjust the output voltage on the secondary side of a compound winding transformer and to generate switching noise. To provide power saving devices without
In a power saving device that suppresses power consumption of a load device by lowering a power supply voltage, a compound winding transformer that supplies at least a voltage having a phase opposite to the power supply voltage, a saturable reactor for adjusting a voltage, and the saturable reactor. A DC power supply for adjusting the inductance component of the reactor.

Further, in the power saving device, the DC power supply is provided with a voltage detection circuit for detecting a voltage of the load device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When the DC current is changed when the impedance of the saturable reactor is zero or maximum, the impedance of the saturable reactor changes steplessly. In the band of the voltage output to the secondary side according to the turn ratio of the side, the voltage supplied to the load device can be continuously adjusted.

[0008]

FIG. 1 shows a first embodiment of a power saving device according to the present invention. Hereinafter, the present invention will be described with reference to the drawings.

The power saving device 1 comprises a compound transformer TR1 connected to an AC circuit, a saturable reactor 2 for adjusting a voltage, and a DC power supply 3 for adjusting an inductance component of the saturable reactor 2. , And the load device 5.

When the winding ratio between the primary side and the secondary side of the compound transformer TR1 is 10: 1 and the impedance of the saturable reactor 2 is 0, a power supply voltage of 100 V is applied to the primary side of the compound transformer TR1. Then, 10 V (−10 V) of the opposite phase is output to the secondary side, and 90 V is supplied to the load device 5.
A voltage of V is supplied.

Next, when the impedance of the saturable reactor 2 is the maximum, if 50 V is applied to the primary side of the compound transformer TR1, the opposite phase 5V (−5) is applied to the secondary side.
V) is output, and a voltage of 95 V is supplied to the load device 5.

When the DC power supply 3 is changed, the impedance of the saturable reactor 2 changes steplessly, so that the voltage supplied to the load device 5 can be adjusted steplessly between 90V and 95V.

FIG. 2 shows a second embodiment of the power saving device according to the present invention.
Shown in Hereinafter, the present invention will be described with reference to the drawings.

The power saving device 11 includes a compound transformer TR2 connected to an AC circuit, a saturable reactor 12 for adjusting a voltage, a DC power supply 13 for adjusting an inductance component of the saturable reactor 12, and a load device. And a voltage detection circuit 14 for detecting the voltage of the power supply 15.

When the winding ratio between the primary side and the secondary side of the compound transformer TR2 is 10: 1 and the impedance of the saturable reactor 2 is 0, a power supply voltage of 100 V is applied to the primary side of the compound transformer TR2. Then, 10 V (−10 V) of the opposite phase is output to the secondary side, and 9 V is output to the load device 15.
A voltage of 0V is supplied.

Next, when the impedance of the saturable reactor 12 is maximum, 50 V is applied to the primary side of the compound transformer TR2.
Is applied, the secondary side has an opposite phase of 5 V (−5
V) is output, and a voltage of 95 V is supplied to the load device 15.

When the DC power supply 13 is changed, the impedance of the saturable reactor 12 changes steplessly.
The voltage supplied to the load device 15 can be continuously adjusted between 90V and 95V. By adding the voltage detection circuit 14 to this circuit, a constant voltage output type power saving device is obtained.

[0018]

As described above, the power saving device according to the present invention is
In a power saving device that suppresses power consumption of a load device by lowering a power supply voltage, a compound winding transformer that supplies at least a voltage having a phase opposite to the power supply voltage, a saturable reactor for adjusting a voltage, and the saturable reactor. By providing a DC power supply for adjusting the inductance component of the reactor, the output voltage on the secondary side of the compound transformer can be adjusted steplessly, and switching noise using contacts is not used. This has the effect of not generating any. Also, by using a saturable reactor, the generated voltage distortion becomes smaller in proportion to the turns ratio of the compound winding transformer, so the output waveform becomes a sine wave compared to a device in which the saturable reactor is directly connected to the power supply circuit. Close, so that there is no need to shape the waveform.

In the power saving device, the DC power supply is provided with a voltage detection circuit for detecting the voltage of the load device, so that the output voltage on the secondary side of the compound transformer can be adjusted steplessly and the contact point can be adjusted. Since no switching means is used, there is an effect that switching noise is not generated, and a constant voltage output type power saving device can be provided. Also, by using a saturable reactor, the generated voltage distortion becomes smaller in proportion to the turns ratio of the compound winding transformer, so the output waveform becomes a sine wave compared to a device in which the saturable reactor is directly connected to the power supply circuit. Close, so that there is no need to shape the waveform.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of a power saving device according to the present invention.

FIG. 2 is an explanatory diagram of a second embodiment of the power saving device according to the present invention.

FIG. 3 is an explanatory diagram of a conventional power saving device.

FIG. 4 is a modified embodiment of the switching means of the conventional power saving device.

FIG. 5 is another modified embodiment of the switching means of the conventional power saving device.

[Explanation of symbols]

1 ... power saving device, 2 ... saturable reactor, 3 ...
・ DC power supply, 5 ・ ・ ・ Load device, TR1 ・ ・ ・ Compound winding transformer.

Claims (2)

(57) [Claims] 1. A power-saving device for suppressing power consumption of a load device by lowering a power supply voltage, a compound winding transformer for supplying at least a voltage having a phase opposite to the power supply voltage, and a saturable reactor for adjusting the voltage. And a DC power supply for adjusting an inductance component of the saturable reactor. 2. The power saving device according to claim 1, wherein in the power saving device, a voltage detection circuit that detects a voltage of the load device is provided in the DC power supply.