JP2002320326A - Standby power reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce remarkably standby power of an apparatus to be controlled and enable to supply stable power to a control means and a load, in a standby power reducing device wherein a commercial power source is connected with a primary side of a power source transformer, the control means is connected with a secondary side, and the load is connected with the control means. SOLUTION: The standby power reducing device 1 is provided with a switching means 3 for switching the commercial power source 2 and primary side input which are connected with a primary side of a power source transformer T1, a control device 6 and a load circuit 7 which are connected with a secondary side, and an operation circuit 8 which switches a secondary side voltage of the power source transformer T1 to a high voltage level and a low voltage level by switching the switching means 3. In the standby power reducing device 1, a voltage monitoring part 14 for monitoring a secondary side voltage is arranged in the control device 6. In the case that a secondary side voltage is the low voltage level, a secondary side voltage of the power source transformer T1 is switched to the high voltage level when the voltage monitoring part 14 detects that a secondary side voltage is lower than or equal to a prescribed voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standby power reducing device that can reduce standby power when a controlled device is on standby (stop) using a power supply such as a commercial power supply.

[0002]

2. Description of the Related Art Conventionally, control means for various controlled devices are:
For example, as shown in FIG.
A commercial power supply 52 is connected to the primary side of the power transformer 51, and a contact 53 of a transformer energizing relay is provided between the commercial power supply 52 and the primary side of the power transformer 51, and a rectifier is provided on the secondary side. The control means 56 is connected via a power supply for the control means having a circuit 54, a constant voltage circuit 55 and the like. Further, the control means 56 includes a load 5 such as a coil of a relay for operating electric components such as a cooling fan and a heater.
7 is connected.

When the operation of the controlled device is started by turning on the operation switch 58, the contact 53 of the relay for energizing the transformer is closed in conjunction with the operation of the operation switch 58, and the power is supplied to the control means 56. At the same time, energization of the load 57 is started. When the operation switch 58 is turned off, the contact point 53 of the relay is opened, the power supply of the control means 56 is cut off, and the power supply to the load 57 is stopped.

As described above, the control means 56 of the controlled device is
However, during operation of the controlled device, power is supplied, but during standby, power supply is cut off and power is not consumed.

[0005]

However, the control means 56 of a controlled device in recent years has a built-in timer mechanism, for example, and operates electric components such as a cooling fan and a heater even when the controlled device is on standby. In order to maintain these functions, power is supplied to the control means 56 even when the controlled device is not actually operated, and current is supplied to both the primary circuit and the secondary circuit, Power is being consumed. Its power consumption cannot be ignored (about 2
４4 W).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a standby power reducing apparatus in which a commercial power supply is connected to a primary side of a power transformer, a control means is connected to a secondary side, and a load is connected to the control means. It is an object of the present invention to significantly reduce standby power of a controlled device and to be able to stably supply power to a control unit and a load.

[0007]

In order to achieve the above object, an invention according to claim 1 is provided with a power transformer and switching means for switching between a commercial power supply connected to the primary side of the power transformer and a primary side input. Standby power reduction comprising control means and a load circuit connected to the secondary side, and operating means for switching the secondary side voltage of the power transformer to a high voltage level and a low voltage level by switching the switching means. In the apparatus, a voltage monitoring unit that monitors a secondary voltage of a power transformer is provided in the control unit, and when the secondary voltage of the power transformer is at a low voltage level, when the voltage monitoring unit detects a predetermined voltage or less. A standby power reducing apparatus for switching a secondary voltage of a power transformer to a high voltage level.

According to a second aspect of the present invention, there is provided a power transformer, switching means for switching between a commercial power supply connected to the primary side of the power transformer and primary side input, control means and a load circuit connected to the secondary side. And a switching means for switching the secondary voltage of the power transformer to a high voltage level and a low voltage level by switching the switching means, wherein the control means includes a secondary voltage of the power transformer. Is provided, and the control means starts energization of the load circuit when the voltage monitoring unit detects a secondary voltage higher than or equal to a high voltage level.

According to a third aspect of the present invention, in the standby power reducing device according to the first or second aspect, the control means has a reference timer for measuring time, and a commercial timer is provided on a secondary side of the power transformer. A pulse generating means for generating a pulse of a power supply frequency is provided, and the pulse is input to the control means to operate a reference timer.

According to a fourth aspect of the present invention, in the standby power reducing apparatus according to any one of the first to third aspects, when the secondary voltage of the power transformer is at a low voltage level during a standby period, the load is reduced. When power is supplied to the circuit, the secondary voltage is switched to the high voltage level only during the power supply time to the load circuit.

According to a fifth aspect of the present invention, in the standby power reduction device according to any one of the first to fourth aspects, the switching means is switched by operating means provided on a secondary side of a power transformer. It is characterized by.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of a standby power reduction device according to an embodiment of the present invention. This standby power reducing device (hereinafter simply referred to as a reducing device) has a power transformer T1, and a commercial power supply (single-phase 100
V) 2 is connected, and a switching circuit 3 for switching the primary side input and switching the secondary side voltage is provided. A control device 6 is connected to the secondary side of the power transformer T1 via a rectifier circuit 4 and a constant voltage circuit 5 to operate a load circuit 7, an operation circuit 8 for switching the switching circuit 3, and a pulse generation circuit 12
Is provided.

The switching circuit 3 includes a photo triac PC 1
The phototriac PC1 is connected to an electric wire drawn out of the primary winding of the power transformer T1 and one end of the commercial power supply 2. When the phototriac PC1 is turned on, the commercial power supply 2 is energized to a part of the primary winding. Therefore, when the input of the power transformer T1 is large and the phototriac PC1 is turned off,
Since the commercial power supply 2 is energized to the entire primary winding, the input of the power transformer T1 is reduced, and the input at this time is set to a value close to the minimum power for maintaining the function of the control device 6. In addition, power transformer T1 photo triac P
By making C1 conductive or non-conductive, the voltage on the secondary side of the power transformer T1 becomes a high voltage level (for example, 20 V).
V), switch to a low voltage level (eg, 10V).

The rectifier circuit 4 is connected to the secondary winding of the power transformer T1 and has a diode bridge DB1 for full-wave rectification of the secondary output, and a diode bridge DB1.
Has a smoothing capacitor C1 for smoothing the output subjected to full-wave rectification.

The constant voltage circuit 5 has an integrated circuit IC1 for stabilizing the voltage output from the rectifier circuit 4. The output side of the integrated circuit IC1 is connected to a control device 6, and the constant voltage output to the control device 6 is performed. VDD2 is supplied. And
By switching the secondary voltage of the power transformer T1 between the high voltage level and the low voltage level, two-stage stable power generated from each voltage level is supplied to the control device 6.

The load circuit 7 includes a constant voltage output transistor Q2 of the load Z1, a load Z1, and a drive transistor Q3 of the load Z1, which are connected in series in this order. At the same time, the base of the driving transistor Q3 is connected to the control device 6 via the resistor R8.

The operation circuit 8 includes a resistor R7, a drive photodiode PD1 for turning on and off a phototriac PC1 of a switching circuit 3 provided on the primary side of the power transformer T1, and a drive transistor Q4 for the photodiode PD1. These are sequentially connected in series, one end of the operation circuit 8 is connected to the constant voltage output VDD2, the other end is connected to the ground, and the base of the driving transistor Q4 is connected to the control device 6 via the resistor R9. ing.

The pulse generation circuit 12 has a diode D1 and a transistor Q1, the collector of the transistor Q1 is connected to a constant voltage output VDD2 via a resistor R1, the control device 6 is connected, and the base is connected to a power transformer. It is connected to the secondary winding of T1 and diode D1, and the emitter is connected to ground. A current having a full-wave waveform on the secondary side of the power transformer T1 is supplied to the base of the transistor Q1 via the resistor R5. Thus, when the input of the power transformer T1 is small, as shown in FIG. 2, the low-voltage full-wave waveform on the secondary side of the power transformer T1 is compared with the DC low voltage of the constant voltage output VDD2, and the transistor Q1
, A pulse waveform having a wide pulse width is generated. When the input of the power transformer T1 is large,
As shown in FIG. 3, the full-wave waveform of the high voltage level on the secondary side of the power transformer T1 is compared with the DC high voltage of the constant voltage output VDD2 to generate a pulse waveform with a narrow pulse width.
Thus, even if the input of the power transformer T1 is switched,
Since a pulse waveform can be created, a pulse waveform serving as a reference clock can always be supplied to the control device 6.

The control device 6 has a microcomputer 13 for controlling the electric components of the controlled device, a voltage monitoring unit 14 for monitoring the secondary voltage of the power transformer T1, and the electric components operating at a set time. Timer part 1 to make
5 are provided. The timer unit 15 has a built-in reference timer for measuring time. And the control device 6
The power supply terminal 17 of the control device 6 connected to the output side of the constant voltage circuit 5, the monitoring terminal 21 for monitoring the secondary voltage of the power transformer T1, and a pulse input for inputting a pulse waveform are provided as input terminals. And a drive terminal 23 connected to the start / stop switch SW1 of the controlled device. The load drive transistor Q3 is provided as an output terminal.
, And an operation circuit terminal 18 connected to the operation circuit 8 are provided.

The voltage monitoring section 14 is connected between the resistors R2 and R3 connected in series to the output side of the rectifier circuit 5 to monitor the output voltage of the rectifier circuit 5, and the divided voltage on the output side of the rectifier circuit 5 is controlled. Is monitoring.

The control device 6 includes a start / stop switch SW1
Is turned on, a signal is transmitted to the operation circuit 8 via the operation circuit terminal 18, and the operation circuit 8 is operated.

When the monitoring terminal 21 detects a value higher than the high voltage level at which the monitoring terminal 21 can operate the load circuit 7 stably, the control device 6 transmits a signal to the load circuit 7 via the load driving terminal 16. Then, the load circuit 7 is operated.

Next, the operation of the thus configured reduction apparatus 1 will be described with reference to FIGS.

When the commercial power supply 2 is applied to the reduction device 1 (for example, the power plug of the controlled device is inserted into the power outlet), current flows through the rectifier circuit 4 and the constant voltage circuit 5, and the control is performed from the constant voltage output VDD2. Power is supplied to the device 6, the pulse generation circuit 12, and the operation circuit 8. The transistor Q1 turns on, the pulse generation circuit 12 operates, a pulse waveform is input to the control device 6, and the timer unit 15 of the control device 6 operates. The voltage generated between the resistors R2 and R3 is monitored by the voltage monitoring unit 14.

Next, when the start / stop switch SW1 is turned on, the control device 6 sends a signal to the operation circuit 8, and the operation circuit 8 is energized. The phototriac PC1 of the switching circuit 3 provided on the primary side of the power transformer T1
Is made conductive. As a result, the input of the power transformer T1 rises, and the voltage on the secondary side of the power transformer T1 rises.
When the voltage on the secondary side rises and the voltage monitoring unit 14 detects a voltage higher than the high voltage level of the secondary side voltage, the control device 6 transmits a signal to turn on the drive transistor Q3 of the load circuit 7 and to apply a signal to the load Z1. Apply current.

Next, when the run / stop switch SW1 is turned off, the control device 6 stops the signal to the operation circuit 8, and stops the energization of the operation circuit 8. As a result, the signal from the driving photodiode PD1 disappears, so that the phototriac PC1 of the switching circuit 3 provided on the primary side of the power transformer T1 becomes non-conductive, and the power transformer T1
Input goes down. Then, the voltage on the secondary side of the power transformer T1 shifts to the low voltage level (10 V). When the voltage level on the secondary side decreases, the voltage monitoring unit 14 does not detect a voltage higher than the high voltage level of the secondary side voltage. Therefore, the control device 6 stops the signal and the driving transistor Q3 of the load circuit 7
Is turned off, and the current to the load Z1 is stopped.

Here, when the timer unit 15 is set so that the load circuit 7 continues to operate even after the controlled device stops, the control unit 6 transmits a signal to the operation circuit 8 until the set time. And the switching circuit 3 is turned on to keep the voltage on the secondary side high, and the load circuit 7 is operated.

When the load circuit 7 is set to operate periodically in the standby state of the controlled device, the control device 6 controls the operation circuit 8 to operate the load circuit 7.
And the secondary side voltage is set to the high voltage level, and the voltage monitoring unit 14 detects the secondary voltage higher than the high voltage level. The timer 15 is programmed so that the operation of the load circuit 7 is stopped after the end of the operation time. Power transformer T only when load circuit 7 is operating
Since the input of 1 is increased and switched so as to decrease before and after the operation, the standby power of the controlled device can be reduced.

Further, when the voltage of the commercial power supply 2 is greatly reduced in the standby state of the controlled device and the voltage monitoring unit 14 detects a voltage lower than a predetermined voltage lower than the divided voltage of the low voltage level, Is set so that a signal is transmitted to the operation circuit 8, the phototriac PC1 is turned on and the input of the power transformer T1 is increased, so that the power supply to the control means 14 is not impaired, 12 and the timer unit 15 and the like are prevented from being disturbed.

As described above, in the reduction device 1 of the present invention, the connection between the commercial power supply 2 and the primary winding of the power transformer T1 is switched by the switching circuit 3, so that the primary input of the power transformer T1 is switched. During the operation of the control device, the secondary voltage of the power transformer T1 is maintained at a high voltage level, and is switched to a low voltage level during standby. Thus, when the controlled device is operating, power is supplied at a high voltage level to energize the load Z1, and during standby when power is not supplied to the load Z1, power is supplied at a low voltage level. And
By supplying the minimum power that can maintain the function of the control device 6, power consumption during standby can be suppressed. Also, the secondary voltage of the power transformer T1 is monitored by the voltage monitoring unit 14,
To cope with voltage fluctuations during standby (for example, when the voltage drop of the commercial power supply 2 is large) and when the voltage monitoring unit 14 detects a voltage lower than a predetermined voltage, the switching circuit 3 is switched to a large input. Can be prevented from malfunctioning.

Further, since the DC voltage of the control device 6 is stabilized against voltage fluctuations and the pulse generating circuit 12 operates normally, a pulse waveform serving as a reference clock can be easily and accurately supplied to the control device 6. it can. Therefore, the functions of the timer unit 15 and the like of the control device 6 are stably maintained.

The operating voltage of the operation circuit 8 is equal to or lower than the constant voltage output VDD2 (the voltage monitoring unit 1).
4 switches the switching circuit 3 so as to raise the primary-side input when detecting a voltage lower than a predetermined voltage), so that the element (phototriac PC1) of the switching circuit 3 can be reliably operated even at a low voltage level. Can be.

Although the present invention has been described based on various embodiments, the present invention is not limited to these embodiments.

[0035]

As described above, according to the present invention, the primary side of the power transformer is connected to the commercial power supply and the switching means for switching the input of the commercial power supply to switch the secondary side voltage. A control unit is connected to the secondary side, and a voltage monitoring unit that monitors the secondary voltage and a load circuit that allows a current to flow through the load are provided in the control unit, and when the controlled device is operated, power is supplied to the load. Sometimes the secondary voltage goes to a high voltage level,
Since the voltage is switched to the low voltage level during standby when power is not supplied to the load, power can be stably supplied to the load and power during standby can be reduced. Also, since the secondary side voltage is monitored to deal with fluctuations in the voltage of the commercial power supply (drop in voltage) during standby, it is possible to supply a minimum amount of power to maintain the function of the control means. Power can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a standby power reduction device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a secondary output of a power transformer and an output waveform of a pulse generating circuit when the controlled device in FIG. 1 is on standby.

3 is a diagram showing a secondary output of a power transformer and an output waveform of a pulse generation circuit when the controlled device of FIG. 1 is operating.

FIG. 4 is a time chart showing output voltages at respective points of the standby power reduction device of FIG. 1;

FIG. 5 is a block diagram showing a configuration of a conventional standby power reduction device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power reduction device 2 Commercial power supply 3 Switching circuit (switching means) 4 Rectifier circuit 5 Constant voltage circuit 6 Control device (control means) 7 Load circuit 8 Operation circuit (operation means) 12 Pulse generation circuit (pulse generation means) 13 Micro Computer 14 Voltage monitoring unit 15 Timer unit T1 Power transformer PC1 Phototriac PD1 Driving photodiode DB1 Diode bridge D1 Diode IC1 Integrated circuit Q1 Transistor Q2 Constant voltage output transistor Q3 Driving transistor Q4 Driving transistor R2, R3 Resistance VDD2 Constant voltage Power supply output voltage Z1 Load

Continued on the front page (72) Inventor Yasuhiro Kobori 1-Otsuki-cho, Ashikaga-shi, Tochigi Sanyo Electric Air Conditioning Co., Ltd. F-term (reference) 5G065 AA01 DA06 HA01 JA04 LA01 MA07 NA08 NA09 5H410 BB04 CC03 DD02 EA10 EB01 EB25 FF03 FF25 GG01 5H730 AA14 AS23 CC12 DD02 DD12 DD32 EE04 EE22 EE57 EE60 EE65 FD21 FF19 FG02 FV04 FV05 XC16 XC20

Claims (5)

[Claims] 1. A power transformer, switching means for switching between a commercial power supply and a primary input connected to a primary side of the power transformer, control means and a load circuit connected to a secondary side, and switching the switching means The standby power reduction device further includes an operation unit that switches a secondary voltage of the power transformer to a high voltage level and a low voltage level, wherein the control unit includes a voltage monitoring unit that monitors a secondary voltage of the power transformer. A standby power supply for switching the secondary voltage of the power transformer to a high voltage level when the voltage monitoring unit detects a predetermined voltage or less when the secondary voltage of the power transformer is at a low voltage level. Reduction device. 2. A power transformer, switching means for switching between a commercial power supply and a primary input connected to the primary side of the power transformer, control means and a load circuit connected to the secondary side, and switching the switching means. The standby power reduction device further includes an operation unit that switches a secondary voltage of the power transformer to a high voltage level and a low voltage level, wherein the control unit includes a voltage monitoring unit that monitors a secondary voltage of the power transformer. A standby power reduction device, wherein the control means starts energization of a load circuit when the voltage monitoring unit detects a high voltage level of the secondary voltage or higher. 3. The control means has a reference timer for measuring time, and a pulse generating means for generating a pulse of a commercial power supply frequency is provided on the secondary side of the power transformer, and this pulse is inputted to the control means. The standby power reducing device according to claim 1, wherein a reference timer is operated. 4. When the secondary voltage of the power transformer is at a low voltage level during a standby period, when the load circuit is energized, the secondary voltage is switched to a high voltage level only for the energizing time to the load circuit. The standby power reduction device according to any one of claims 1 to 3, wherein: 5. The standby power reduction device according to claim 1, wherein the switching unit is switched by an operation unit provided on a secondary side of a power transformer.