JP2003189463A - Device for preventing surge trouble in electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing the extraneous surge trouble of an electric apparatus, which can prevent the involuntary reset or damage of the electric apparatus caused by the surge generated by thunder or the like, without incurring the complication of the constitution of a plurality of electric apparatuses controlled centralizedly. <P>SOLUTION: When surge arises in a power centralized controller 1 to the plural electric apparatuses 20, the strength level of the surge detected with a surge detection means 6 and/or the frequency of surge are compared with set values, and the continuation/break of power supply to the above electric apparatus 20 is controlled based on the result. Hereby, even if there is such situation that the power source constituent parts in the power centralized controller 1 is subjected to stress by surge, this can prevent the electric apparatus 20 from being reset involuntarily or being damaged by the penetration of an abnormal current. <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 prevention of surge accidents in electric equipment used for protecting a plurality of electric equipment such as personal computers and refrigerators used at home from surges caused by lightning strikes and other causes. Regarding the device.

[0002]

2. Description of the Related Art In recent years, in a general home or the like, a plurality of electric devices such as a television receiver, a refrigerator and a personal computer are connected to a home server or the like through a network, and the home server or the like centrally controls each electric device. Systems, so-called home automation systems, are becoming popular.

For example, in Japanese Patent Laid-Open No. 11-313441, a plurality of electric devices in a home are connected to a centralized power control device via a home network, and the centralized power control device considers the type and operating condition of the electric device. There is disclosed a technique of performing the above control to suppress the waste of electric power.

In such a system, it is necessary to supply electric power to electric equipment in a stable and efficient manner, and a switching power supply is often used as the power supply of the centralized power control device.

As is well known, as shown in FIG. 6, the switching power supply rectifies the alternating current of the commercial AC power supply AC by the bridge rectifier circuit BD1 and then the smoothing capacitor C.
5, and the switching element S1 is turned on / off at a high frequency of about 100 KHz, so that the charging voltage charged in the smoothing capacitor C5 is supplied to the power transformer T1.
Is input to the primary side of the power transformer T1, and the secondary output of the power transformer T1 is rectified by the rectifying and smoothing circuit RC to obtain a predetermined DC voltage.

In such a switching power supply, high-frequency noise tends to occur due to the ON / OFF switching operation of the switching element S1, and in order to prevent this high-frequency noise from flowing through the AC cable to the outside. The measures are taken.

Specifically, a normal mode coil L1 for reducing high frequency normal mode noise generated between the lines in FIG. 6 (between the live line L and the neutral line N).
L2 and across the line capacitors C1, C2,
Further, a common mode coil L3 for reducing high frequency common mode noise generated between the line and GND (between the live line L and the neutral line N and the ground line E) and line bypass capacitors C3 and C4 are provided.

[0008]

However, in the switching power supply having the above-mentioned structure, when inductive interference due to lightning strike occurs between the live line L and the ground line E (or between the neutral line N and the ground E), the A surge is generated between the lines, and the voltage of this surge becomes a high voltage of several KV, and the overcurrent caused thereby causes the normal mode coil L1.
→ Common mode coil L3 → Line bypass capacitor C4 → Main body chassis → GND on commercial AC power supply AC side → Route of earth line E or normal mode coil L
2 → Common mode coil L3 → Line bypass capacitor C3 → Main body chassis → GND on commercial AC power supply AC →
It flows through the route of the ground wire E), and as a result, the line bypass capacitors C4, C3, etc. are stressed by an overvoltage exceeding the rating.

Further, when the induction disturbance occurs between the live line L and the neutral line N, a surge also occurs between these lines, and the voltage of this surge becomes a high voltage of several KV, which causes an overcurrent. The current (surge current) is the normal mode coil L1 → across the line capacitor C2.
→ Normal mode coil L2 → Commercial AC power supply AC side N terminal → Flows along the route of neutral wire N, and as a result, the across-the-line capacitors C1, C2, etc. are stressed by an overvoltage exceeding the rating.

When the above-mentioned stress causes the across-the-line capacitors C1 and C2 or the line bypass capacitor C4 (C3) to be in a short-circuited state or an open state, the switching power supply fails. As a result, a malfunction of the centralized power control occurs, multiple electric devices that are collectively controlled fall into an unintended reset state, such as during a power failure, or an abnormal current enters through a power line, etc. Invite.

As a countermeasure against surges caused by lightning in electric equipment, for example, in Japanese Patent Laid-Open No. 9-23638, a power supply unit is provided with a circuit for absorbing the surge voltage.
A technique for preventing damage to electric equipment due to the surge is disclosed.

However, if the above-mentioned conventional technique is applied to the centralized control system, a surge voltage absorption circuit must be provided in each of the power supply units of a plurality of electric devices whose power is controlled, and There is a problem that the structure of the power supply unit of the electric device becomes complicated and the cost becomes high.

The present invention has been made in view of the above circumstances, and a surge generated due to a lightning strike or the like does not complicate the configuration of a plurality of electric devices centrally controlled by an electric power centralized control device. It is an object of the present invention to provide a surge accident prevention device for an electric device, which can prevent the electric device from being damaged or being unintentionally reset to interrupt the power supply.

[0014]

The above problems have been detected by surge detecting means for detecting the occurrence of a surge on the power supply side of a power centralized control device for individually controlling the electric power of a plurality of electric devices, and surge detecting means. Surge intensity level and /
Alternatively, comparing means for comparing the number of occurrences of surge with a predetermined value, and control means for controlling continuation / interruption of power supply to the electric device based on a comparison result by the comparing means,
It is solved by a surge accident prevention device for electric equipment, which is characterized in that

In this device, when a plurality of electric devices are centrally controlled by the electric power centralized control device and a surge occurs on the power source side in the electric power centralized control device due to a lightning strike or the like, this is detected by the surge detecting means and the surge is detected. The intensity level and / or the number of surges generated are compared with a predetermined value by the comparison means. Surge intensity level and /
Alternatively, when the number of surges exceeds the set value, the control means cuts off the power supply to the electric device.

Therefore, when the power supply components in the centralized power control system are in a state of being stressed by the surge, the power supply to the electric equipment is cut off, so that the electric equipment is reset unintentionally. This is prevented in advance, and a situation in which an electric device is damaged by the intrusion of an abnormal current or the like is avoided.

The surge accident prevention apparatus for electric equipment may be provided with an input operation means capable of arbitrarily changing the setting of an undesired interruption of power supply among the plurality of electric equipment. In this case, if the user sets in advance the electric device for which the power supply is desired to be continued, the power supply to the electric device is maintained regardless of the occurrence of the external surge.

Further, the data storage means for storing operation data of the electric device when the power supply is cut off is provided, while the control means stores the data for the electric device whose power supply is restarted. The configuration may be such that the operation data stored in the means is distributed. In this case, when the power supply is restarted, the electric device returns to the operating state before the interruption.

Further, while the time measuring means for measuring the time elapsed from the surge detection by the surge detecting means is provided, the control means shuts off the power supply when the time measured by the time measuring means becomes a predetermined value or more. The configuration may be released. In this case, the power supply will be restarted after a sufficient amount of time has passed since the last surge, and it is possible to restart the power supply in a highly safe state where the fear of surge has been eliminated. .

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a home automation system to which a surge accident prevention device for electric equipment according to an embodiment of the present invention is applied. Note that, in FIG. 1, thin lines connecting the respective parts indicate signal lines, and thick lines indicate power lines.

In FIG. 1, this system includes a home server 1 as a centralized power control device, and a plurality of electric devices (including electronic devices) 20 that are centrally managed by the home server 1. .

The home server 1 has a dedicated power supply unit 2,
Centralized control unit 3, backup power supply unit 4, operation data storage unit 5, surge detection unit 6 provided in the power supply unit 2, set value storage unit 7, power supply setting storage unit 8, input operation unit 9, time measurement unit. Equipped with 10.

The power supply unit 2 supplies drive power for each unit of the home server 1, and is composed of, for example, a switching power supply.

The centralized control unit 3 controls the electric power supply to the electric devices 20 individually, and when a surge occurs, the central control unit 3 operates according to the detection result of the surge detection unit 6 of each electric device 20. Continued power supply (also called ON)
In addition to controlling / off (also referred to as OFF), when there is no fear of occurrence of a surge, control is performed to restart the power supply to the electric device 20 whose power supply is cut off. This point will be described later.

The centralized control unit 3 also supplies the electric data before the interruption of the electric device 20 stored in the operation data storage unit 5 to the electric device 20 when the power supply is restarted after the electric power is cut off. It also has a distribution function. Further, the centralized control unit 3 includes a surge occurrence number counting unit 11 and a comparison unit 12.
It also has the function of.

The backup power supply unit 4 supplies electric power in place of the power supply unit 2 when the power supply function of the power supply unit 2 is stopped due to a power failure or the like, and is composed of, for example, a private power generator.

The operation data storage unit 5 stores operation data of the electric device 20 when the electric power supply to the electric device 20 is cut off due to the occurrence of the surge.

The surge detecting section 6 detects a surge generated on the power source section 2 side due to inductive interference due to lightning. Specifically, when the surge voltage and / or the surge current is detected and the surge voltage or the surge current exceeds a certain level, the surge detection signal indicating the occurrence of the surge is displayed at the intensity level (the magnitude of the voltage and / or the current). It is adapted to be transmitted to the control unit 3 together with the above.

The set value storage unit 7 stores a set value relating to a surge intensity level and / or a set value of the number of surge occurrences, which serves as a reference for shutting off the power supply to the electric device 20. These set values are input operation unit 9
By this, the user can arbitrarily input and set.

The power supply setting storage unit 8 stores the types of the plurality of electric devices 20 that may or may not be cut off from the power supply. Whether or not to cut off the power supply to each electric device 20 can be arbitrarily set by the user through the input operation unit 9, and is stored as a table as shown in FIG. 2, for example. . In the example of FIG. 2, the refrigerator and the electric light are set not to cut off the power against the surge.

As described above, the input operation unit 9 stores the set value by inputting the set value of the surge intensity level and / or the set value of the number of surges, which is a reference for cutting off the power supply, by the user. It is used for operations such as storing in the unit 7 or inputting the necessity of power supply cutoff for a plurality of electric devices 20 and storing in the power supply setting storage unit 8.

The time measuring unit 10 has a function of measuring the elapsed time from the time when the surge detection signal is input from the surge detection unit 6 to the centralized control unit 7, and when a certain time has elapsed, the centralized control unit 10 is operated. Notify 3.

The electric device 20 is connected to the central control unit 3 via a power line (specifically, a power supply line and a data and signal transmission line are included) LO.

Examples of the electric device 20 include a television receiver (referred to as a television) 21, a video tape recorder (referred to as a video) 22, a refrigerator 23, an air conditioner (referred to as an air conditioner) 24, an electric light 25, a printer 26, and a personal computer. (Called a personal computer) 2
7 and the microwave oven 28 and the like. Of course, the electric device 20
Are not limited to these.

The surge occurrence number counting section 11 counts the number of times the surge detection signal g is input from the surge detecting section 6, in other words, the number of surge occurrences.

The comparison unit 12 compares the number of surge occurrences counted by the surge occurrence count unit 11 with the set value of the number of surge occurrences stored in the set value storage unit 7, and at the same time, the surge detection unit 6 The intensity level (magnitude of voltage and / or current) of the surge detection signal g input from is compared with the intensity level set value stored in the set value storage unit 7.

FIG. 3 is a block diagram showing the configuration of the switching power supply used in the dedicated power supply unit 2.

In FIG. 3, the switching power supply 2 includes a rectifying circuit for rectifying AC from the commercial AC power supply AC, for example, a diode bridge rectifier circuit BD1 and a smoothing capacitor C connected in parallel to the output terminal of the bridge rectifier circuit BD1.
5, a power supply transformer T1 whose primary side is connected in parallel to both ends of the smoothing capacitor C5, a switching element S1 inserted between the smoothing capacitor C5 and the primary side of the power supply transformer T1, and a power supply transformer And a rectifying and smoothing circuit RC connected in parallel to the secondary side.

Further, in the live line L and the neutral line N on the commercial AC power source AC side, normal mode coils L1 and L2 for reducing high frequency normal mode noise generated between lines (between the live line L and the neutral line N) are provided. Are interposed between the lines, and across-the-line capacitors C1 and C2 for normal mode noise reduction are connected between the lines, which are located in the front stage and the rear stage of the normal mode coils L1 and L2, respectively.

Further, between the line and GND (live line L
Also, a common mode coil L3 and line bypass capacitors C3 and C4 for reducing high frequency common mode noise generated between the neutral wire N and the ground wire E are provided.

Windings a and b of the common mode coil L3
Is connected to the core CR3, the surge detection winding c
Are electrically isolated and coupled. In this winding c, a current / voltage detection circuit 61 for detecting that the electromotive force induced in the winding c due to the occurrence of a surge exceeds a certain value.
Are connected.

The current / voltage detecting circuit 61 includes windings a and b of the common mode coil L3 and a surge detecting winding c.
And the like constitute the surge detector 6.

In the above structure, the AC from the commercial AC power supply AC is input between the lines, and the bridge rectifier circuit BD1
After being full-wave rectified by, the smoothing capacitor C5 is charged to be smoothed and converted into a direct current.

The charging voltage charged in the smoothing capacitor C5 is turned on / off at high frequency by the switching element S1.
By the operation, it is input to the primary side of the power transformer T1.
The output on the secondary side of the power supply transformer T1 is rectified and smoothed by the rectifying and smoothing circuit RC, so that a predetermined DC voltage is obtained. The obtained DC voltage is supplied as a drive power supply voltage to required parts such as the centralized control section 3, the operation data storage section 5, the set value storage section 7, the power supply setting storage section 8 and the like.

In such a switching power supply 2, the ON / OFF switching operation of the switching element is performed at a high frequency of about 100 KHz.
High-frequency noise due to it tends to occur,
It is absorbed by the normal mode coils L1 and L2, across the line capacitors C1 and C2, the common mode coil L3, and the line bypass capacitors C3 and C4.

That is, the normal mode noise as high frequency noise generated between the lines (between the live line L and the neutral line N) is generated by the normal mode coils L1 and L2.
Common mode noise, which is reduced by the Across the Line capacitors C1 and C2 and is generated between the line and GND (between the live line L and the neutral line N and the ground line E) as high frequency noise, is the common mode coil L3 and the line bypass capacitor C3. , C4.

By the way, when an induction disturbance such as a lightning strike occurs, a surge occurs between the live line L and the ground line E or between the neutral line N and the ground E, and a high voltage of several KV is generated between these lines. Voltage is generated.

The resulting overcurrent is the normal mode coil L1 → common mode coil L3 → line bypass capacitor C4 → main body chassis → GND of the commercial AC power supply AC.
Terminal → Ground wire route, or Normal mode coil L2 → Common mode coil L3 → Line bypass capacitor C3 → Main body chassis → GND of commercial AC power supply AC
It flows from the terminal to the ground wire E route.

As a result, the line bypass capacitor C4
(Or C3) is overvoltageed, and the line bypass capacitor C4 (or C3) is stressed.

However, as described above, the overcurrent caused by the surge occurs in the route of the normal mode coil L1 → common mode coil L3 → line bypass capacitor C4 → main body chassis → GND terminal of the commercial AC power supply AC → earth line E. When flowing, or normal mode coil L
2 → Common mode coil L3 → Line bypass capacitor C3 → Main body chassis → GND terminal of commercial AC power supply AC →
When flowing through the route of the ground wire E, a current also flows through the winding a or the winding b of the common mode coil L3, and an electromotive force is induced in the winding c by the mutual induction action at this time. The electromotive force induced in the winding c is detected by the current / voltage detection circuit 61, and when the level exceeds a certain value, it is sent to the central control unit 3 as a surge detection signal g.

Receiving the surge detection signal g, the comparison unit 12 of the centralized control unit 3 compares the intensity level of the surge detection signal g with the set value of the intensity level stored in the set value storage unit 7. As a result, if the intensity level of the surge exceeds the set value, the centralized control unit 3 cuts off the power supply to the electric device 20 set to cut off the power supply. In the example of FIG. 2, the TV 21, the video 22, the air conditioner 24, the printer 26, the personal computer 27, and the microwave oven 28 are targets for interruption.

If the intensity level of the surge does not exceed the set value, the centralized control section 3 causes the surge occurrence number counting section 11 to count the number of surge detection signals g, that is, the number of surge occurrences. Then, the comparison unit 12 compares the counted number of surge occurrences with the set value of the number of surge occurrences stored in the set value storage unit 7, and if the number of surge occurrences exceeds the set value, centralized control is performed. The unit 3 cuts off the power supply to the electric device 20 set to cut off the power supply.

When the power supply is cut off, the centralized control unit 3 reads each operation data of the electric device 20 and stores it in the operation data storage unit 5.

As described above, if the intensity level of the surge generated in the power source section 2 exceeds the set value, the power supply to the electric device 20 is cut off as described above.
The electric device 20 is prevented from being reset unintentionally, and an abnormal current flows into the electric device 20 through the power line LO due to deterioration of the high-frequency noise reduction component or the like, which may damage the electric device 20. It is also effectively prevented.

Further, even when the intensity level of the surge is below a predetermined value, if the number of surges exceeds the set value, high frequency noise reducing parts and the like are repeatedly stressed. Since the power supply to the electric device 20 is cut off, it is possible to prevent the electric device 20 from being unintentionally reset or damaged.

Moreover, since the surge detector 6 may be provided in the power supply unit 2, the configuration of the entire system is not complicated and the cost can be reduced as compared with the case where the surge absorbing circuits are individually provided in the electric devices 20. Up can be suppressed.

Since the set value of the intensity level of the surge and the set value of the number of surge occurrences can be arbitrarily changed by the user side, the electric power supply to the electric device 20 is cut off by the surge having no fear of adverse effects. There is no fear that the operation of the system will be confused.

When a certain time has passed after the surge was detected,
When measured by the time measuring unit 10, the central control unit 3
On the assumption that there is no fear of a surge, the power supply to the electric device 20 in the power supply cutoff state is restarted. Therefore, the power cutoff state of the electric device 20 does not abnormally extend.

When the power supply is restarted, the centralized control unit 30 reads the operation data of the electric device 20 whose power supply has been cut off before the cutoff from the operation data storage unit 11 and distributes it to each electric device 20. Therefore, the operation of the electric device 20 whose power supply has been restarted is properly restarted in the state before the interruption.

Next, the flow of surge response processing by the centralized control unit 3 will be described with reference to the flowchart of FIG.

In FIG. 4, in S101, it is determined whether or not a surge has occurred by the presence or absence of the surge detection signal g. If a surge has occurred (the determination in S101 is YE
In S) and S102, it is determined whether or not the surge intensity level exceeds the set value.

If the surge intensity level exceeds the set value (YES at S102), at S103, the electric power supply setting storage unit 8 recognizes the electric device 20 that does not interfere with the power cutoff, and then at S104. Then, the operation data of the electric device 20 that shuts off the power is read and stored in the operation data storage unit 5.

After that, in S105, the electric power supply to the electric device 20 to be cut off is cut off, and if there is an electric device 20 whose power supply is cut off, an abnormal stop indicating that the operation is stopped. The flag is set to "1" and the process ends.

If the surge intensity level does not exceed the set value (NO at S102), at S106,
1 is added to the count value of the number of occurrences, and it is determined in S107 whether the number of occurrences of surge exceeds a set value. If the number of surges exceeds the set value (the determination in S107 is YE
S) and S103. If the number of surges does not exceed the set value (NO in S107), the process ends.

If no surge has occurred (NO in S101), it is determined in S108 whether or not a predetermined time has elapsed since the previous surge detection. If the predetermined time has passed since the last surge (YES in S108),
In S109, the electric device 2 having the abnormal stop flag "1"
Judge whether there is 0 or not. If the predetermined time has not elapsed since the last surge (NO in S108), the process ends. Also, when there is no electric device 20 having the flag “1” (NO in S109), the process ends.

If there is an electric device 20 with the flag "1" (YES in S109), the power supply to the electric device 20 is restarted in S110, and stored in the operation data storage unit 5 in S111. The operation data before interruption is transferred to the corresponding electric device 20, and the process ends.

FIG. 5 shows another modification of the surge detecting section 6, and the same or corresponding parts as in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the surge detecting winding d is coupled to the core CR1 of the normal mode coil L1.

When an induction disturbance or the like due to a lightning strike occurs between the live line L and the neutral line N, a surge occurs between these lines and a high voltage of several KV occurs. The resulting overcurrent is the normal mode coil L1 → across the line capacitor C2 → normal mode coil L2 →
It flows from the N terminal of the commercial AC power supply AC to the route of the neutral line N.

At this time, an electromotive force is also induced in the winding d by the mutual induction action caused by the current flowing in the coil L1. The electromotive force level induced in the winding d is detected by the current / voltage detection circuit 61, and when the level exceeds a certain value, it is sent to the central control unit 3 as a detection signal g.
The processing for the surge detection signal g in the centralized control unit 3 is the same as that of the embodiment shown in FIGS. 1 to 4, and therefore its explanation is omitted.

In the above embodiment, the intensity level of the surge and the number of occurrences are compared, and if either exceeds the set value, the power supply to the electric device 20 is cut off.
It may be either the intensity level of the surge or the number of occurrences.

As shown in FIG. 3, the surge detecting section 6 includes a surge detecting winding c as a common mode coil L3.
, Which is coupled to the core CR3 of the normal mode coil L1 and the surge detection winding d is coupled to the core CR1 of the normal mode coil L1 as shown in FIG. The windings c and d may be provided at the same time and a surge may be detected from each of them. Although not shown, the surge detection winding c or the surge detection winding d is not connected to the drive line and the neutral line, but is only connected to the drive line and the neutral line by the core. And, for example, the detection winding c
Or by winding an insulating tape between d and the core,
It can be easily insulated from the commercial power supply.

[0074]

According to the invention of claim 1, when a surge occurs on the power supply side of the centralized power control device for a plurality of electric devices, the intensity level of the surge and / or the number of surge occurrences are compared with a set value. However, since the continuation / interruption of the power supply to the electric device is controlled based on the result,
Even if the power source components in the centralized power control device are stressed by the surge, it is possible to prevent the electric device from being reset unintentionally and from being damaged due to the intrusion of an abnormal current. Moreover, as compared with the case where the surge absorbing circuit is provided in each of the electric devices 20, the entire configuration can be simplified and the cost increase can be suppressed.

According to the second aspect of the present invention, among the plurality of electric devices, the setting input operation means capable of arbitrarily changing the undesired interruption of the power supply is provided. By setting the electric device in advance by the user, the power supply to the electric device can be continued regardless of the occurrence of the surge.

According to the invention of claim 3, the operation data of the electric device when the power supply is cut off is stored, and when the power supply is restarted, the operation data is distributed to the electric device. With the resumption of power supply, the electric device can be properly operated as before the interruption.

According to the invention of claim 4, when the time elapsed from the occurrence of the surge exceeds a predetermined value, the interruption of the power supply is released, so that there is no danger of the occurrence of the surge, so that a safe condition is ensured. The power supply can be restarted at.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a home automation system to which a surge accident prevention device for an electric device according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a setting input example of continuation / interruption of power supply to an electric device.

FIG. 3 is an electric circuit diagram showing a configuration of a switching power supply as a power supply unit of the power supply centralized control device.

FIG. 4 is a centralized control unit 3 of the power supply centralized control device.
7 is a flowchart showing a flow of processing when a surge occurs due to.

FIG. 5 is an electric circuit diagram showing another modification of the surge detector 6.

FIG. 6 is an electric circuit diagram showing a configuration of a conventional switching power supply.

[Explanation of symbols]

1 ... Centralized power control device 2 ・ ・ ・ ・ ・ ・ Power supply 3 ... Central control unit 5 ・ ・ ・ ・ ・ ・ ・ Operation data storage 6 ... Surge detector 7: Setting value storage section 8 ・ ・ ・ ・ ・ ・ ・ Power supply setting section 9: Setting input operation section 10: Time measurement section 11 ・ ・ ・ ・ ・ ・ ・ ・ Surge occurrence count section 12 --- Comparison section 20 (21-28) ... Electrical equipment

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5G004 AA05 AB02 BA07 DC04 DC14                 5G053 AA10 BA04 BA09 CA01 DA01                       EA01 EA03 EB02 FA07                 5G064 AA04 AC05 AC08 CB12 CB16                       DA07                 5H410 CC03 DD02 EA26 EB40 FF03                       FF22 LL03

Claims (4)

[Claims] 1. A surge detection means for detecting the occurrence of a surge on the power supply side of a centralized power control device for individually controlling the electric power of a plurality of electric devices, and a surge intensity level and / or surge detected by the surge detection means. And a control means for controlling continuation / interruption of power supply to the electric device based on a comparison result by the comparison means. Equipment surge prevention device. 2. The surge accident prevention device for an electric device according to claim 1, further comprising an input operation unit capable of arbitrarily setting, among the plurality of electric devices, an undesired cutoff of power supply. 3. The data storage unit stores operation data of an electric device when the power supply is cut off, while the control unit stores the data in the electric device whose power supply is restarted. 3. The surge accident prevention device for electric equipment according to claim 1, wherein the operation data stored in the means is distributed. 4. The power measuring device includes a time measuring unit that measures a time elapsed from the surge detection by the surge detecting unit, and the control unit cuts off the power supply when the time measured by the time measuring unit becomes a predetermined value or more. The surge accident prevention device for electric equipment according to claim 3, wherein the device is released.