KR20030087679A - Automatic power supply cutoff apparatus - Google Patents

Abstract

PURPOSE: An automatic power cutoff apparatus is provided to reduce a power consumption and influence of magnetic interference. CONSTITUTION: An automatic power cutoff apparatus comprises a current sensing unit(13) for sensing the current flowing through the wire; a load change sensing unit(14) for sensing the load change of the wire; an output unit(12) for turning on/off the power being supplied to the wire; a storing unit for dividing the value of the current sensed by the current sensing unit at n-time intervals(wherein n is an integer larger than 2), and storing the value divided at the time intervals; a set unit for setting the range of the minimum current value in the (n-1)th time interval stored in the storing unit; and a process unit for controlling the output unit to turn off the power when the n-th current value sensed by the current sensing unit falls in the range of the (n-1)th minimum current value set by the set unit, and controlling the output unit to turn on the power when the change of load sensed by the load change sensing unit exceeds the range of the (n-1)th minimum current value set by the set unit.

Description

AUTOMATIC POWER SUPPLY CUTOFF APPARATUS}

The present invention relates to an automatic power cutoff device, and more particularly, to an automatic power cutoff device that automatically cuts off power when a current flows below an automatically set current value in response to a power change or a load change.

Background Art In recent years, a large number of power supply terminals are required in home appliances such as computers and audio, and so-called power strip connection terminals are commonly used.

These power connection terminals are composed of plugs, outlets, and cords for use indoors by connecting to a main power supply terminal, for example, a main power supply terminal pre-mounted on a wall of a home, an office, and the like. There is a switch to cut off the supply.

In addition, in the power supply terminal used in factories, etc., a mechanism is provided to cut off power for each workplace separately from the power supply terminal supplied outdoors.

However, in the case of general electric and electronic devices, even when the power supply of the device itself is turned off, current always flows between the power supply terminal and the device, thereby reducing power consumption and lifespan of the device. In order to prevent this, the user had to unplug the electrical and electronic devices that are not used by the user.

In addition, in a power strip for office and home use, the power supply disconnect switch of the power strip is very cumbersome since it is usually mounted on the bottom of the back of the installed electronic device in order to efficiently execute the aesthetics and wiring of the wiring result. do. In addition, since the on / off of such a switch must always be checked, it is extremely rare for a user to directly turn on / off the switch, and the situation is always used by keeping the on state.

One technique for solving this problem is disclosed in Korean Laid-Open Patent Publication No. 2000-30154.

The technique disclosed in the above publication provides a light emitting switch for turning on / off a power supply to a plug inserted into an outlet for operating an electrical appliance. That is, in such a structure, the power is turned on only when the user inserts a plug into an outlet to operate an electric product and turns on the light switch again. After use, the light-emitting switch must be turned off to cut off the power supply.

However, in order to use the structure as described above, the user has to turn on / off while searching for the plug inserted into the outlet one by one, thereby merely simplifying the operation of plugging and unplugging the plug.

In other words, when the user forgets the operation of plugging and unplugging or when the outlet is covered by a desk or office equipment, there is a problem that the technique disclosed in the above publication cannot exert its effect.

Recently, as a way to solve this problem, a product incorporating a power interruption device in a power strip has been introduced.

That is, in the above-described multi-tap, for example, an interface box is provided between the computer main body and the multi-tap, and a keyboard or a mouse is connected to the interface box, and the computer main body and peripheral devices (monitor It has a built-in power cut-off device that shuts off power to the printer, scanner, speaker, etc.).

However, when the above-described power strip is used in an office or a factory, a separate power strip and an interface box must be installed for each user's computer, so the installation cost is high, and in the office or factory, the main power supply terminal and the power terminal of the power strip are required. When a considerable distance is required between them, the cord length of commercially available multi-taps is only 1 m to 3 m, and another connection cord is required. Therefore, even when the switch attached to the power strip is operated in the OFF state or when the power strip including the power cut-off device is used as described above, current flows between the additional cord lines for connecting the main power terminal and the power strip terminal. In such a case, touching an additional cord line during a cleaning or the like may cause an electric shock and a fire accident.

In addition, when going out for a long time, for example, a refrigerator or the like should be supplied with power in an electric appliance used at home. Therefore, as described above, the power strip having a built-in power cut-off device cannot be used, and the main switch, that is, the main switch of the home transformer cannot be turned off, so that an accident of a short circuit cannot be prevented.

In addition, if the main power supply terminal is unable to supply power due to a failure such as a disconnection light, the user should measure it using a voltmeter to recognize it, but since such a device is not provided in a general household, it is very cumbersome to recognize it. I had to.

As an example of the technology for solving the above problems there is the Republic of Korea Patent Publication No. 2001-0081216 filed by the present inventors.

1 is a block diagram of a power interruption device disclosed in this publication.

The power cutoff device of FIG. 1 is a power supply unit 1 connected to a 220V or 120V power supply supplied from an outdoor wiring, an output unit 2 connected to the power supply unit 1 and supplying commercial power to an indoor electronic device or an electric device. , A current sensing unit 3 connected to the power supply unit 1 to sense current flowing through the wiring, and a load variation detecting unit 4 connected to the power supply unit 1 to detect load changes of an electronic device or an electrical device connected to the indoor wiring line 4. ) Is connected to the power supply unit 1, the current detection unit 3, and the load fluctuation detection unit 4, and according to the current or load fluctuation detected by the current detection unit 3 and the load fluctuation detection unit 4. The current value to be measured according to the type and power of the electric or electronic device used by the user for arbitrarily setting the control condition of the control unit 5 and the control unit 5 for controlling the power supply and cutoff in 1). The setting unit 6 and the control unit 5 which can be set arbitrarily As a means for controlling by a sub-signal, a control signal input unit for changing a control state of the control unit 5 by turning on / off the wireless remote control unit in order to prevent the power cut-off device from being mounted on the ceiling near the room. It consists of 7).

However, in the technique disclosed in the above publication, the user should arbitrarily set the current value to be measured according to the type and power of the electric or electronic device used by the setting unit 6, and also according to the respective use conditions. Since it is necessary to change the control state of the control unit 5 by turning on / off, it is very inconvenient to use the power cutoff device described in the above publication for the ordinary user who is incapable of utilizing the electric and electronic equipment.

An object of the present invention is to solve the problems described above, and to provide an automatic power cutoff device that can automatically cut off the power when not in use of electronic devices and electrical equipment by automatically measuring the current flowing in the wiring.

Another object of the present invention is to provide an automatic power cutoff device capable of automatically conducting power in response to a change in load state after the power is cut off.

Still another object of the present invention is to provide an automatic power cutoff device that can easily determine whether a short circuit occurs.

Still another object of the present invention is to provide an automatic power cutoff device that can suppress electromagnetic waves to the maximum by cutting off power supplied from indoor wiring to indoor wiring.

1 is a block diagram of a conventional power cut device;

2 is a block diagram of an automatic power cut device according to an embodiment of the present invention;

3 is a circuit diagram of a power interruption device according to an embodiment of the present invention;

FIG. 4 is a flowchart for explaining an operation of the automatic power shutoff device shown in FIG. 2;

5 is a view showing a state of a current value sensed by the current sensing unit shown in FIG.

Explanation of symbols on the main parts of the drawings

11 power supply unit 12 output unit

13 current sensing unit 14 load fluctuation detecting unit

15: central processing unit 16: memory

20: power supply and cutoff part 30: outlet part

21: electronic circuit unit 31: switch

The automatic power cutoff device of the present invention for achieving the above object is an automatic power cutoff device that cuts off standby power supplied to the wiring when the electronic device and the electrical equipment of the home, office or factory are not used, the current flowing through the wiring A current sensing unit for sensing, a load variation detecting unit for detecting a load fluctuation state of the wiring, an output unit for performing on / off of power supplied to the wiring, and n current values detected by the current sensing unit (n Storage means for dividing and storing at intervals of two or more integers), setting means for setting a range of minimum current values within the (n-1) th time interval stored in the storage means, and detected by the current sensing unit. When the nth current value falls within the range of the (n-1) th minimum current value set by the setting means, the power supply from the output unit is turned off, When the variation of the load detected by the load change detection section group beyond the range of (n-1) th value of the minimum current of the setting means and a processing sudanreul handling the supply of power from the output section is turned on.

In the automatic power cut-off device of the present invention, the n time intervals (n is an integer of 2 or more) are set within 24 hours.

In the automatic power cut-off device of the present invention, the load fluctuation detecting unit, the storing unit, the setting unit, and the processing unit are made of one microprocessor.

In the automatic power cut-off device of the present invention, the division is divided into n time intervals (n is an integer of 2 or more) in the storage means and the minimum current within the (n-1) th time interval in the setting means. The setting of the range of values is characterized by being changeable by a program.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

In addition, the same code | symbol is used for the same part, and repeated description is abbreviate | omitted.

2 is a block diagram of an automatic power cut device according to an embodiment of the present invention.

In FIG. 2, reference numeral 11 denotes a power supply unit for supplying power required for each component of an electronic circuit unit by converting AC or DC 5-10V from 220V or 120V commercial power supplied from outdoor wiring. 12 is connected to the power supply unit 11, and mainly composed of an output relay, and directly supply the AC 220V or 120V commercial power supplied from the power supply unit 11 to the wiring of the electronic or electrical equipment in the room, or AC or DC 5 It is an output part that can supply ~ -10V to wiring to detect load fluctuation.

Reference numeral 13 denotes a current sensing unit connected to the power supply unit 11 and mainly configured as a CT for measuring a current of the wiring, and supplying a current value flowing through the CT to the central processing unit 15, and (14) a power supply unit ( 11) Load fluctuation detection part with reactance and resistance measuring circuit for detecting reactance and resistance value which change according to load fluctuation of electronic device or electric device connected to indoor wiring.

15 is connected to the power supply unit 11, the current sensing unit 13 and the load fluctuation detecting unit 14 to set the minimum current value for turning off the automatic power shut-off device, the reference current value or reactance value and the current sensing unit (13) and the current or load value detected by the load fluctuation detection unit 14 and compares the control value of the relay operation of the output unit 12 in accordance with the change of the comparison value to supply the power from the power supply unit 11 and It is a central processing unit that handles blocking.

16 is a ROM, RAM, PROM, etc. to store the current value detected by the current sensing unit 13, the reference value set by the central processing unit 15, etc. at a time interval set by the central processing unit 15. It is a memory unit consisting of.

The load fluctuation detecting unit 14, the central processing unit 15, and the memory unit 16 are formed of one microprocessor.

Each component shown in FIG. 2 consists of one electronic module.

Hereinafter, the automatic power cutoff device of FIG. 2 according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a circuit diagram of an automatic power cut device according to an embodiment of the present invention.

First, in FIG. 3, 20 corresponds to the configuration of FIG. 2 as a power supply and cut-off unit, and 30 has a function of a power supply terminal that is directly connected to an indoor electronic device or an electric device as an outlet. .

21 denotes an electronic circuit unit in which the power supply unit 11, the load fluctuation detection unit 14, the central processing unit 15, and the memory unit 16 shown in FIG. 2 are mounted on a single PCB. 2 corresponds to the current sensing unit 13 of FIG. 2, and 22 to 25 correspond to the output unit 12 of FIG. 1 and constitute a relay or a contactless relay.

220V or 120V commercial power is supplied to the power supply and cut-off unit 20 in the outdoor wiring, so that operating power is supplied to an indoor electronic device or an electric device, for example, a computer device.

At this time, measurement of the current value flowing through the entire wiring is started in C.T, which is the current sensing unit 13.

When the user turns off the power of the computer, the current value flowing in the wiring fluctuates, and this fluctuation value is measured by the CT and stored in the memory unit 16 of the electronic circuit unit 21, for example, 3 mA or less. If there is no change in this current value even after a predetermined time has elapsed, the power supply is cut off by the central processing unit 15.

That is, when the current value measured in C.T becomes equal to or less than the predetermined value stored in the memory unit 16, the relays 22 and 23 are turned off and the relays 24 and 25 are turned on.

The voltage flowing after the interruption is maintained at AC or DC 5-10V by the electronic circuit unit 21.

Hereinafter, a method of mutual operation of each component of the automatic power cutoff device shown in FIGS. 2 and 3 will be described in more detail with reference to FIGS. 4 and 5.

FIG. 4 is a flowchart illustrating an operation of the automatic power shutoff device shown in FIG. 2, and FIG. 5 is a diagram illustrating a state of a current value sensed by the current sensing unit shown in FIG. 2. An example of the measured current value at home, Figure 5 (b) is an example of the measured current value in the office or factory.

First, the power supply and cutout unit 20 is mounted on the wiring of AC 220V or 120V which is supplied to the user's home, office, factory, etc. outdoors.

When the power supply and disconnecting unit 20 is mounted, the current sensing unit 13 measures the current flowing in the wiring (step S10), and the central processing unit 15 measures the current value detected by the current sensing unit 13. n pieces (n is an integer of 2 or more) are divided into time sections and stored in the memory unit 16 (step S11).

The n time intervals (n is an integer of 2 or more) are preferably set to 24 hours in the case of a home, and 8 hours in the case of an office or a factory.

FIG. 5A shows a variation of the current value measured by the current sensing unit 13 in the case of a home, and FIG. 5B illustrates a variation of the current value measured by the current sensing unit 13 in the case of a factory or office as a time axis. The vertical axis represents the current value and the horizontal axis represents the passage of time.

In FIG. 5A, section ① is a period in which a home is sleeping and electric appliances other than the refrigerator are not operated, and a change in the current value of the section ① indicates that the refrigerator is periodically operated for a refrigerated state of the refrigerator.

Section ② shows the state in which power consumption increases by turning on lighting fixtures and TVs in the process of preparing the family in the morning by waking up, and section ③ shows off the lighting fixtures and TVs during the day, and the washing machine is temporarily turned off. Section ④ shows the state that the lighting equipment and the TV were turned on for several hours in the evening.

In FIG. 5B, section ⑤ represents a state in which an office or a factory consumes only indispensable electric power such as an emergency light and turns off all other electric devices and electronic devices, and section ⑥ represents office or office hours in the morning after work. In the factory, all the electric equipment and electronics are turned on, and the section ⑦ is the lunch time of the office or factory, and only some of the electric and electronic devices are in the warm state, and the section ⑧ is all the electricity in the office or the factory as afternoon working hours. The section ⑨ shows the state that the device and the electronic device are turned on, and the section ⑨ shows the state in which the office or the factory consumes only necessary power such as emergency lights and turns off all other electric devices and electronic devices, as in the section ⑤ after work.

With respect to the measured current value as described above, the central processing unit 15 sets the range of the minimum current value within the (n-1) th time interval stored in the memory unit 16 (step S12), and the current sensing unit When the nth current value detected in (13) is included in the range of the (n-1) th minimum current value set by the central processing unit 15 (step S13), the power supply at the output unit 12 The supply is turned off to cut off the power supply (step S15), and the load fluctuation detected by the load fluctuation detecting unit 14 changes the range of the (n-1) th minimum current value set by the central processing unit 15. If it transcends, the supply of the power from the output part 12 is turned ON, and power is supplied (step S14).

In addition, the setting of the range of the minimum current value within the n-th (n is an integer of 2 or more) time intervals and in the (n-1) th time interval in the setting means is performed by the central processing unit 15. This can be done by changing the executable program.

That is, the current value measured as described above is stored in the memory unit 16, and the central processing unit 15 sets a range of the minimum value among the current values stored in the memory unit 16, for example, 0.2A to 0.3A. Then, the set minimum value is stored in the memory unit 16, and the minimum value is determined to be turned off in the home, office or factory.

Normally, AC 220V or 120V is always supplied to the primary side of the power supply unit 11, and the supplied power supply is the "A" contact point of the relay of the output unit 12 via a wire passing through the CT of the current sensing unit 13. It is transmitted to the wiring of the electrical equipment through.

When the user turns off the electric equipment used, the current value by the CT of the current sensing unit 13 is reduced, and at this time, the range of the minimum current value stored in the memory unit 16 and the central processing unit 15 When the sensed current value is compared and the result of the comparison is that the sensed current is within the range of the stored current value, the relay of the output unit 12 is turned OFF and is maintained in the "B" contact state.

In FIG. 2, when the relay is in the "B" contact state, AC or DC 5-10V in the power supply unit 11 is connected to the wiring of the electric device through the "B" contact of the output relay, and AC 220V is provided in the wiring. OFF and AC 5-10V or DC 5-10V is applied.

When the user turns on the switch again or uses a plug to use the electric device again, the change or reactance of the microcurrent in the load fluctuation detecting unit 14 using AC 5-10V or DC 5-10V applied to the wiring After detecting and amplifying the change of the amplified signal is transmitted to the central processing unit (15).

The central processing unit 15 turns on the relay of the output unit 12 according to the detection signal from the load fluctuation detecting unit 14, and the output unit 12 turns on the relay to supply AC 220V through the "A" contact point. Maintain normal operation of electric equipment by supplying.

That is, according to the present invention, since the voltage applied to the unused wiring is maintained at AC or DC 5 to 10V, the voltage is 10% or less compared to the existing 220V.

Therefore, the power consumption applied to the wiring can be reduced, thereby reducing the electric field and the magnetic field, thereby dramatically reducing the influence of electromagnetic waves.

In addition, since the voltage applied to the wiring is maintained at AC or DC 5 to 10V, it is possible to sufficiently prevent an electric leakage or an electric shock.

After the power is cut off, the load fluctuation detecting unit 14 in the electronic circuit unit 21 continuously monitors the load state of the wiring.

After a certain time, when the user turns on the electronic device, for example, the computer, the load variation detection unit 14 measures whether the load state changes within a set range.

The power is turned on when the load condition changes within the set range, that is, within AC or DC 5-10V.

That is, the relays 24 and 25 are turned off in the power supply and cut-off unit 20, and the relays 22 and 23 are turned on to supply a normal commercial voltage.

In the above description, the case where the power supply and the disconnecting unit 20 is installed between the transformer and the indoor wiring of the home or office has been described.

In addition, in FIG. 2, the outlet part 30 is connected in parallel with indoor wiring, and is comprised from the switch 31, the resistor 32, the display lamp 33, and the outlet 34. As shown in FIG.

In the present invention, the switch 31 can be turned on or off manually or by a wireless remote control, and the display lamp 33 uses a neolamp or a light emitting diode.

When the switch 31 is turned on by the wireless remote control or manually, the load state of the wiring is changed, and the load fluctuation detecting unit 14 detects this and keeps the wiring on.

In addition, when the plug 31 of the electronic device or the electric device is inserted into the outlet 34 without artificially turning on the switch 31, the load state also changes, and the case where the switch 31 is turned on is similarly detected. The unit 4 senses the change state and keeps the wiring on.

In addition, according to the present invention, when the switch 31 of the outlet portion 30 is pressed, the display lamp 33 is turned on to confirm whether power is applied to the outlet portion 30.

That is, when the switch 31 is pressed when the power is applied, the display lamp 33 is turned on, and when the switch 31 is pressed while the power is not applied, the electronic circuit unit 21 detects this and for a predetermined time. After the power is applied, the display lamp 33 is turned on.

Therefore, it is possible to easily determine whether the outlet of the outlet portion 30 is short-circuited.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

That is, the same effect as in the above-described embodiment is used even when a multi-tap consisting of an existing plug, a cord, and an outlet part 30 of the present invention is configured, and the technique disclosed in Korean Patent Application Laid-Open No. 2000-30154 is used in addition. Of course it is done.

In addition, in the above embodiment, the structure in which the automatic power cut-off device is provided in the wiring supplied from the outside is described, but it is also possible to limit the use range of each room, each office or factory in the home.

As described above, according to the automatic power cut-off device of the present invention, it is possible to reduce the current consumption when not using indoor electronic devices and electrical equipment to within about 10% compared to the existing device.

In addition, according to the present invention, since the current consumption is reduced as described above to reduce the electric field and magnetic field, the effect of electromagnetic waves is reduced by that much.

In addition, according to the present invention, when going out for a long time such as vacation, even if the main power supply terminal of the transformer for supplying power to the room is turned off, the power supply and shut-off unit 20 is operated so that the power is turned on during operation of the refrigerator or the like. Since the power is turned off during the rest period of the refrigerator, the state of the refrigerator and the like can be kept constant.

Claims (4)

In the automatic power cut-off device to cut off the standby power supplied to the wiring when the electronic and electrical equipment of the home, office or factory is not used, A current detector for sensing a current flowing through the wiring; A load variation detector for detecting a load variation state of the wiring; An output unit for performing on / off of power supplied to the wiring; Storage means for dividing and storing the current values detected by the current sensing unit at n time intervals (n is an integer of 2 or more); Setting means for setting a range of the minimum current value within the (n-1) th time interval stored in the storage means; When the nth current value sensed by the current sensing unit is included in the range of the (n-1) th minimum current value set by the setting means, the power supply from the output unit is turned off, and the load And a processing means for processing the supply of power to the output unit when the variation in the load sensed by the variation detection unit exceeds the range of the (n-1) th minimum current value of the setting means. Automatic power off device. The method of claim 1, And n times (n is an integer of 2 or more) are set within 24 hours. The method of claim 1, The load fluctuation detecting unit, the storing unit, the setting unit, and the processing unit comprise one microprocessor. The method of claim 3, In the storage means, the setting of the section of the n current intervals (n is an integer of 2 or more) and the range of the minimum current value within the (n-1) th time interval in the setting means can be changed by a program. Automatic power cut off device characterized in that.