JP3849933B2 - Power saving circuit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power saving circuit that reduces standby power of an electronic device.
[0002]
[Prior art]
A conventional power saving circuit is shown in FIG. In this power saving circuit, one end of the first capacitor 1 is connected to one pole of the AC power supply 6, and one end of the first switching element 2 is connected to one pole of the AC power supply 6. The other end of the second capacitor 3 is connected to one end of the second capacitor 3, and the first capacitor 1 and the series circuit of the first switching element 2 and the second capacitor 3 are connected in parallel; One AC terminal of the rectifier bridge 7 is connected to the other ends of the first capacitor 1 and the second capacitor 3, and a second switching element 4 is connected to one pole of the AC power source 6, and this second Is connected to the other pole of the AC power supply 6 and the other AC terminal of the rectifying bridge 7 (see Patent Document 1).
[0003]
[Patent Document 1]
International Publication No. 00/14850 (page 4-6, Fig. 1)
[0004]
[Problems to be solved by the invention]
Since the configuration is as described above, the first switching element 2 and the second switching element 4 are simultaneously turned on from the same signal line, and the alternating current is supplied to the inside of the power source and the load side. As a result, there is a problem that it is difficult to reduce the size and cost of the apparatus.
[0005]
The present invention has been made in view of the above problems, and provides a novel power-saving circuit capable of reducing the number of parts, downsizing, and cost.
[0006]
[Means to solve the problem]
The present invention, which has been made to achieve the above object, requires only one switching element when supplying an AC current to the inside of the power supply and to the load side. As a result, the number of components can be reduced. Therefore, the size and cost of the apparatus can be reduced.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the power saving circuit of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a power saving circuit according to the present invention. 1, 3 and 9 are capacitors, 2 is a switching element, 6 is an AC power supply, 7 is a rectifier bridge, 8 is a Zener diode, 11 is a sensor circuit, and 12 is a load.
[0008]
In the power saving circuit according to this embodiment, one end of the first capacitor 1 is connected to one pole of the AC power supply 6. Similarly, one end of the switching element 2 is connected to one pole of the AC power source 6, and the other end of the switching element 2 is connected to one end of the second capacitor 3 to form a series circuit. 1 are connected in parallel. A load 12 is connected to a connection portion between the switching element 2 and the second capacitor 3, and the load 12 is connected to the other pole of the AC power supply 6.
[0009]
One AC terminal of the rectifier bridge 7 is connected to a connection portion between the series circuit and the first capacitor 1. The other AC terminal of the rectifying bridge 7 is connected to the other pole of the AC power source 6. A Zener diode 8 is connected between the DC terminals of the rectifier bridge 7, a smoothing capacitor 9 is connected in parallel with the Zener diode 8, and a sensor circuit 11 is connected in parallel with the Zener diode 8.
[0010]
The power saving circuit configured as described above operates as follows. Charges move between each pole of the AC power supply 6 and the corresponding electrode plate of the first capacitor 1 to generate an AC current. This AC current is rectified by the rectifier bridge 7 when flowing between the AC power source 6 and the first capacitor 1. Due to this rectifying action, an amount of charge corresponding to the Zener voltage of the Zener diode 8 is charged in the smoothing capacitor 9 and functions as a DC power supply 10 for the sensor circuit 11.
[0011]
Since the sensor circuit 11 is not limited in configuration, a specific configuration is not shown in this embodiment. However, the sensor circuit 11 includes a sensor. When the sensor is turned on, the switching element 2 is turned on. When the switching element 2 is turned on, an alternating current passing through the switching element 2 and the second capacitor 3 flows from the alternating current power source 6, and this alternating current is also supplied to the rectifying bridge 7. For this reason, the current output capability of the DC power supply 10 is reinforced. Further, the other end of the switching element 2 is connected to the load 12, and when the switching element 2 is turned on, the AC voltage of the AC power supply 6 is supplied to the load 12, and the load 12 is in an operating state. The load 12 includes a light receiving element. When the light receiving element receives an ON command from the sensor of the sensor circuit 11, the load 12 shifts from a standby state to an operating state.
[0012]
On the other hand, when the light receiving element receives an off command from the sensor of the sensor circuit 11, the switching element 2 is also turned off, and the power saving circuit returns to the standby mode. When the switching element 2 is turned off, no alternating current is supplied to the load 12, and the first capacitor 1 and the second capacitor 3 do not consume power, so the power consumption in the standby mode of the power saving circuit is the zener diode. 8 and the consumption of the sensor circuit 11 only. In addition, since the phase of the alternating current passing through the first capacitor 1 and the second capacitor 3 is advanced by 90 ° compared to the terminal voltage of the first capacitor 1 and the second capacitor 3, no power is consumed.
[0013]
【The invention's effect】
According to the present invention, when an alternating current is supplied to the inside of the power source and the load side, only one switching element is required. As a result, the number of parts can be reduced, and accordingly, the apparatus can be reduced in size and cost. There is an effect that can be reduced.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of an embodiment according to the present invention.
FIG. 2 is a circuit diagram of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st capacitor 2 Switching element 3 2nd capacitor 6 AC power supply 7 Rectifier bridge 8 Zener diode 9 Smoothing capacitor 11 Sensor circuit 12, 22 Load

Claims (3)

One end of the first capacitor is connected to one pole of the AC power supply, one end of the switching element is also connected to one pole of the AC power supply, and one end of the second capacitor is connected to the other end of the switching element, A first capacitor and a series circuit of the switching element and the second capacitor are connected in parallel, and one AC terminal of the rectifier bridge is connected to the other ends of the first capacitor and the second capacitor. The other AC terminal of the rectification bridge is connected to the other pole of the AC power supply, a load is connected to the other end of the switching element, and the load is connected to the other pole of the AC power supply and the other AC terminal of the rectification bridge. Circuit means for supplying current to the DC power source and the load through the first capacitor and the second capacitor when the switching element is turned on Saving circuit, characterized in that it comprises. The power saving circuit according to claim 1, wherein a Zener diode is connected to both ends of the DC terminal of the rectifier bridge, and a smoothing capacitor is connected in parallel with the Zener diode. The power saving circuit according to claim 1 or 2, wherein a sensor circuit having sensors is provided at both ends of a DC terminal of the rectifying bridge.

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