KR101101839B1 - Break-Control System for supplying a Electric Power useful home - Google Patents

Abstract

The present invention discloses a power control technique. In other words, the household power supply cutoff control device and its driving method according to an embodiment of the present invention confirms the state of electricity use at home in real time and performs the most stable power cutoff operation through zero crossing, as well as overcurrent cutoff and earth leakage cutoff. In addition, by protecting the relay through undervoltage cutoff and overvoltage cutoff, it is possible to diagnose the abnormal state of the power supply in the home from time to time and minimize the risk of electric accidents that may occur in the home.
In addition, the present invention records all the actions related to the protection relay to prevent the risk of recurrence through the follow-up management and cause analysis in advance to increase the user's purchase rate due to the maximization of the user's convenience and safety and thereby increase the sales Improve expectations.

Description

Break-Control System for supplying a Electric Power useful home}

The present invention relates to a power control technology, in particular, to check the electricity use status at home in real time, and to perform the most stable power off operation through zero crossing, as well as through the over-current cut off, earth leakage cutoff, undervoltage cutoff and overvoltage cutoff The present invention relates to a household power supply cutoff control system for protecting a relay and a method thereof.

With the rapid increase in power usage today, the importance of power load management and electrical safety accidents is of great importance.

Currently, homes, offices, and industrial sites cut off the power supply by using an earth leakage circuit breaker (ELCB) and a molded case circuit breaker (MCCB) in case of electrical accidents (short circuit, electric shock, ground fault). And control.

However, the conventional shut-off control device is composed of a contact point inside, there is a problem that the smooth operation is difficult due to the wear of the contact surface as the number of operations and the time passes, and there is a problem that can not check the electrical information on the power consumption. .

In order to solve this problem, a control device equipped with a high-performance microprocessor is constructed in the power supply cutoff control device currently being developed to efficiently measure the load of the power circuit and quickly turn on the power in the event of an electrical accident (short circuit, electric shock, ground fault). There is a continuing need for a high performance power supply shutoff control device that cuts off the supply and performs effective recovery by immediately detecting the information obtained due to an accident.

The home power supply cutoff control system and method thereof of the present invention have been devised to solve the problems of the prior art. The first object of the present invention is to check the state of electricity use at home in real time, It not only performs stable power off operation but also protects the relay through over current cut off, earth leakage cut off, under voltage cut off and over voltage cut off, so it is possible to diagnose the abnormal state of power consumption provided in the home from time to time. This is to minimize the risk of an accident.

In addition, the second object of the present invention is to record all operations related to the protective relay to block in advance the risk of recurrence through after-care and cause analysis.

In addition, the third object of the present invention is to increase the purchase rate of the user through the maximization of the convenience and safety of the user, thereby improving the expectation for increased sales.

The present invention for achieving the above object includes the following configuration.

That is, the home power supply cutoff control system according to an embodiment of the present invention, the current transformer for reducing the primary current supplied from the outside to the secondary current; An image current transformer for monitoring a current leakage state on the line by measuring an image current checked on a line in real time; An instrument transformer for transforming the primary voltage supplied from the outside to lower the secondary voltage; The secondary current, the image current or the secondary voltage is input to amplify and filter the secondary current, the image current or the secondary voltage, respectively, and the amplified and filtered secondary current, the image current or the secondary voltage is preset. Compared with a reference power value, respectively, whether the secondary current is an overcurrent, the image current is a leakage current, and whether the secondary voltage is an overvoltage or an undervoltage, respectively, generates an interrupt signal when at least one is generated. Amplification and comparator; When the secondary current is determined to be an overcurrent, the image current is determined to be an electric leakage current, or the secondary voltage is determined to be an overvoltage or undervoltage, the interrupt signal received from the amplifier and the comparator is input to receive a predetermined switching control signal. A controller for generating; And a contact control device configured to include a contactless switch which switches off from a switching on state to an off state through a contactless switching method of a device-equipped semiconductor device when receiving the switching control signal. And a blocking control device including a contactless switch for switching off from a switching-on state to an off state through a contactless switching method of a device-equipped semiconductor device. The blocking control device is connected in parallel with the blocking control device. The apparatus further includes N branch interruption control devices having the same configuration as the device.

In addition, the home power supply cut-off control method according to an embodiment of the present invention, the current transformer for the instrument dropping the primary current supplied from the outside to the secondary current; Monitoring an electric leakage state on the line by measuring an image current checked on a line in real time by an image current transformer; The transformer transformer transforms the primary voltage supplied from the outside to drop to the secondary voltage; Amplifying and comparator receiving the secondary current, image current or secondary voltage to amplify and filter the secondary current, image current or secondary voltage, respectively; The amplifying and comparator compares the amplified and filtered secondary current, image current, or secondary voltage with a predetermined reference power value, respectively, to determine whether the secondary current is an overcurrent, the image current is a leakage current, or the secondary voltage. Identifying whether the overvoltage or undervoltage is respectively at least one to generate an interrupt signal; When the secondary current, the image current or the secondary voltage is determined as the overcurrent by the amplification and comparator, respectively, as the leakage current, or as the overvoltage or undervoltage, the controller receives an interrupt received from the amplification and comparator. Receiving a signal and generating a predetermined switching control signal; And switching off the switching from the switched on state to the off state through the contactless switching method of the device-equipped semiconductor device when the contactless switch receives the switching control signal, and the blocking control device including the contactless switch; It is characterized in that the N branch cutoff control device connected in parallel.

The household power supply cutoff control system and method thereof according to the present invention check the electricity use status at home in real time and perform the most stable power cutoff operation through zero crossing, as well as overcurrent cutoff, earth leakage cutoff, undervoltage cutoff and overvoltage cutoff. By protecting the relay through the power supply can be diagnosed from time to time whether the abnormal state of the power supply to the power consumption in the home, and has the first effect of minimizing the risk of electrical accidents that can occur in the home.

In addition, the present invention has a second effect of recording all operations related to the protective relay to block the risk of recurrence through after-care and cause analysis in advance.

In addition, the present invention has a third effect of increasing the user's purchase rate through the maximization of the user's convenience and safety, thereby improving the expectation of increasing sales.

1 is a diagram illustrating a system for controlling a cut off of a home power supply according to an exemplary embodiment of the present invention.
2 is a detailed view showing a cutoff control apparatus according to an embodiment of the present invention.
3 is a diagram illustrating an amplifier and a comparator of the cutoff control device according to an embodiment of the present invention.
4 is a detailed view showing an amplification and comparator of the cutoff control device according to an embodiment of the present invention.
5 is a diagram illustrating a controller of a cutoff control apparatus according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating at least one semiconductor device used as a solid state switch of a cutoff control device according to an embodiment of the present invention.
7 is a flowchart illustrating a method for controlling household power supply cutoff according to an embodiment of the present invention.

[Example]

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a system for controlling a cut off of a home power supply according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the home power supply cutoff control system 2000 includes a current transformer (CT: 100), a current transformer (ZCT: 110), a transformer (PT: 120), an amplifier and a comparator 200, and a controller. And a cutoff control device 1000 including a contact point switch 400, a solid state switch 400, an indicator 500, a memory 510, a clock generator 520, and a communication module 530. The same N branch interrupt control device 1000 'is formed.

First, the instrument current transformer 100 converts the primary current into a secondary current in order to measure the current usage of power supplied from the outside.

The image current transformer 110 monitors an electric leakage state on a line by measuring an image current checked on a line in real time.

The instrument transformer 120 transforms the primary voltage into a secondary voltage in order to measure the voltage state of the power supplied from the outside.

The amplification and comparator 200 receives a secondary current, an image current, or a secondary voltage to amplify and filter the secondary current, the image current, or the secondary voltage, respectively.

The amplification and comparator 200 compares the amplified and filtered secondary current, image current, or secondary voltage with a predetermined reference power value, respectively, so that the secondary current is an overcurrent, an image current is a leakage current, and a secondary voltage. Check if this is an overvoltage or undervoltage.

 When the amplified and filtered secondary current, image current or secondary voltage is identified as an overcurrent, a leakage current, or an overvoltage or undervoltage by the amplification and comparator, respectively, the amplification and comparator 200 is at least one. Generates an interrupt signal based on the identification of an abnormal condition.

When the controller 300 receives the interrupt signal from the amplification and comparator 200, the controller 300 generates a predetermined switching control signal, and then transfers the switching control signal to the solid state switch 400.

As the contactless switch 400 receives the switching control signal from the controller 300, the contactless switch 400 changes the cutoff state from the on state to the off state through the contactless switching method using an instrumented semiconductor device.

When the switching state of the semiconductor device is changed to cut off from switching on to off, the indicator 500 notifies the outside of the change using a light-emitting diode (LED) or an alarm.

The memory 510 temporarily stores values corresponding to an abnormal value, that is, secondary currents identified as overcurrent, image currents identified as leakage current, and secondary voltages identified as overvoltage or undervoltage, respectively. Record the exact time for the differential current, image current, and secondary voltage.

The clock generator 520 continuously generates a clock signal, thereby inducing the controller 300 to set a time point at which the controller 300 generates the switching control signal as time information.

At this time, the memory 510 records and stores time information preset by the clock generator 520.

On the contrary, when the controller 300 receives power information indicating both the secondary current, the image current, or the secondary voltage, which are normally confirmed by the amplification and comparator 200, the controller 300 receives the secondary current, the image current, or the secondary. A / D conversion of voltage.

In addition, the controller 300 controls the secondary current digital signal, the image current digital signal, or the secondary voltage digital signal generated by the A / D conversion to be displayed on the connected indicator 500.

At this time, the memory 510 temporarily stores the values corresponding to the normal values, that is, the secondary current digital signal, the image current digital signal, or the secondary voltage digital signal, and displays the corresponding values at an external request by the controller 300. )

The communication module 530 is further included in the cutoff control device 1000 and the at least one branch cutoff control device 1000 ', and selects the secondary current digital signal, the leakage current digital signal, or the secondary voltage digital signal displayed on the indicator. Is transmitted through wired / wireless communication network.

In addition, the N branch cutoff control devices have the same configuration as the cutoff control device, and are respectively connected in parallel with the cutoff control device.

In the following more detailed description, the cutoff control device 1000 according to an embodiment of the present invention provides a display function, switching on / off as shown in FIG. 2. It executes the power supply cutoff function or the protection relay function to cut off overcurrent, leakage, undervoltage and overvoltage.

First, the cutoff control device 1000 performs a display function as follows.

That is, the secondary current, the image current, or the secondary voltage detected from the instrument current transformer 100, the image current transformer 110, and the instrument transformer 120 are amplified and compared by the amplification and comparator 200.

If the amplification and comparator 200 is less than or equal to the secondary current, the image current or the secondary voltage to a predetermined reference power value, the controller 300 is the secondary current confirmed to be normal by the amplification and comparator 200. Power information indicating both the image current or the secondary voltage is displayed on the connected indicator 500, respectively.

In addition, the communication module 500 transmits a secondary current, an image current, or a secondary voltage having a normal value displayed on the indicator 500 through a wired or wireless communication network.

If the amplification and comparator 200 checks the secondary current, the image current, or the secondary voltage as a value larger than the preset reference voltage, the controller 300 determines the secondary current, the image current, or the secondary voltage identified as an abnormal value. Each of the notification information indicating that the overcurrent, the leakage current, the overvoltage or undervoltage is transmitted to the display 500.

The indicator 500 periodically displays notification information capable of displaying the overcurrent, the leakage current, the overvoltage, or the undervoltage in the form of a symbol so as to easily identify the overcurrent, the leakage current, the overvoltage, or the undervoltage from the outside.

In other words, the indicator 500 may occasionally display a notification display to the outside by using an LED or an alarm that is stored so that an external current, an leakage current, an overvoltage, or an undervoltage may be easily understood from the outside.

Next, the cutoff control device 1000 may switch on / off. Implement power cut off function as follows.

Each secondary current, image current, or secondary voltage detected from the instrument current transformer 100, the image current transformer 110, and the instrument transformer 120 is input to the controller 300 via the amplification and comparator 200. .

As the amplification and comparator 200 confirms the secondary current, the image current, or the secondary voltage to a value greater than the preset reference voltage, the controller 300 sets the secondary current, the image current, or the secondary voltage to the overcurrent, the leakage current. It generates the interrupt signal by judging it as over voltage or under voltage.

In addition, the controller 300 converts the interrupt signal into a switching control signal, and then transfers the converted switching control signal to the solid state switch 400, thereby providing a semiconductor device (ex: TRIAC for triode for example). Alternating current (SSR), solid state relay (SSR), silicon control rectifier (SCR), and insulated gate bipolar transistor (IGBT) are controlled to switch from on to off.

At this time, the contactless switch 400 is a contactless circuit breaker, the arc is not generated during the on-off switching conversion has a great advantage in the service life does not receive an electrical stress on the equipment used in the house.

In addition, when the contactless switch 400 receives a forced command from the outside after being blocked by the controller 300, the contactless switch 400 may be forcedly changed from the off state to the on state.

In other words, when the solid state switch 400 is forcibly changed from the switching off state to the switching on state, the secondary current re-input from the instrument current transformer 100, the image current transformer 110, the instrument transformer 120, The image current and the secondary voltage are amplified and applied to the comparator 200 to recheck whether power is cut off (recompared with the reference power value).

Next, the cutoff control device 1000 performs a protection relay function for blocking an overcurrent, an electric leakage, an undervoltage, and an overvoltage in advance as follows.

(1) overcurrent blocking

When the secondary current detected from the instrument current transformer 100 is determined to be greater than the preset reference power value, the amplification and comparator 200 generates an interrupt signal, and the controller 300 receiving the interrupt signal receives the secondary current. Generates a predetermined switching control signal to protect the relay according to the overcurrent.

(2) Overvoltage or undervoltage blocking

After the secondary voltage detected by the instrument transformer 120 is input to the amplification and comparator 200, if the secondary voltage is confirmed to be greater than the preset reference power value or is determined to be a very small value, an interrupt signal is generated, and the controller The control unit 300 generates a predetermined switching control signal for relay protection by determining the secondary voltage as an overvoltage or undervoltage.

(3) leakage current blocking

After the image current detected by the image current transformer 110 is input to the amplification and comparator 200, and when the image current is determined to be greater than the set reference power value, the amplification and comparator 200 determines the image current as the leakage current. To generate an interrupt signal.

Accordingly, the controller 300 generates a switching control signal for relay protection for the image current provided from the current transformer 110 for the image meter.

(4) Other additional features

As the clock generator 520 previously connected to the controller 300 continuously generates a clock signal, the controller 300 sets time information on a time point for generating the switching control signal.

In addition, the memory 510 previously connected to the controller 300 temporarily stores secondary currents identified as overcurrent, image currents identified as leakage currents, and secondary voltages identified as overvoltage or undervoltage, respectively. Record the exact time for the differential current, image current, and secondary voltage.

Accordingly, the manager can quickly check the secondary current, the image current, and the secondary voltage, which appear as abnormal values temporarily stored in the memory 510, so as to quickly analyze the cause of the electric accident (short circuit, electric shock, ground fault). Not only does it work, but it also makes it possible to respond immediately.

3 is a diagram illustrating an amplifier and a comparator of the cutoff control device according to an embodiment of the present invention.

Referring to FIG. 3, the amplifier and comparator 200 includes a first input unit 210, a second input unit 220, a third input unit 230, an amplifier 240, a filter unit 250, and a comparator 260. ), A multiplexer unit 270 and a reference voltage supply unit 280.

The first input unit 210 receives the secondary current from the current transformer for the instrument.

The second input unit 220 receives an image current from the image current transformer.

The third input unit 230 receives the secondary voltage from the instrument transformer.

The amplifier 240 amplifies the secondary current, the image current or the secondary voltage.

The filter unit 250 removes noise included in the amplified secondary current, the image current, or the secondary voltage, respectively.

The comparator 260 compares the noise-reduced secondary current, image current or secondary voltage with the reference power value provided by the reference power supply 280.

When the secondary current, the image current, or the secondary voltage is greater than the reference power value, the comparator 260 generates an interrupt signal and transmits the interrupt signal to the controller according to the determination of the secondary current, the image current or the secondary voltage as an abnormal value.

When the secondary current, the image current, or the secondary voltage is less than or equal to the reference power value, the multiplexer unit 270 determines the power information indicating both the secondary current, the image rectification, or the secondary voltage as a normal value, and externally outputs the same. .

More specifically, as shown in FIG. 4, the amplification and comparator 200 targets the input secondary current, the image current, or the secondary voltage, respectively, by comparing with the amplification, filtering, and reference power values, respectively. Check for current, overvoltage or undervoltage.

First, the first input unit 210 receives the secondary current applied from the current transformer for the instrument.

The amplifier 240 amplifies the secondary current and transmits it to the filter unit 250, and the filter unit 250 removes noise included in the amplified secondary current.

The secondary current from which the noise is removed is compared with a reference power value preset by the comparator 260.

In the comparison, when the secondary current is less than or equal to the reference current value, the secondary current is determined to be normal and transmitted to the controller 300 through the multiplexer unit 270.

If the secondary current is larger than the reference current value, the secondary current is determined to be an abnormal value, thereby causing an interrupt signal to be generated.

Subsequently, the second input unit 220 receives an image current applied from the image current transformer.

The amplifier 240 amplifies the image current and transmits it to the filter unit 250, and the filter unit 250 removes noise included in the amplified image current.

The image current from which the noise is removed is compared with a reference power value preset by the comparator 260.

In the comparison, when the image current is less than or equal to the reference power value, the image current is determined to be normal and transmitted to the controller 300 through the multiplexer 270.

If the image current is greater than the reference power value, the image current is determined to be an abnormal value, thereby causing an interrupt signal to be generated.

In addition, the third input unit 230 receives the secondary voltage applied from the instrument transformer.

The amplifier 240 amplifies the secondary voltage and transmits it to the filter unit 250, and the filter unit 250 removes the parasitic noise from the amplified secondary voltage.

The secondary voltage from which the noise is removed is compared with a reference power value preset by the comparator 260.

In the comparison, when the secondary voltage maintains the reference power range of a predetermined level, the secondary voltage is determined to be normal and transmitted to the controller 300 through the multiplexer unit 270.

If the secondary voltage is out of the reference power supply range of a predetermined level, the interrupt signal is generated because the secondary voltage is determined to be an abnormal value.

5 is a diagram illustrating a controller of a cutoff control apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the controller 300 includes an operation and A / D converter 310, a controller 330, an interrupter 320, and a signal outputter 340.

First, when the arithmetic and A / D converter 310 receives power information indicating the normally determined secondary current, the image current, or the secondary voltage from the multiplexer unit, respectively, the secondary current and the image current determined normally. Alternatively, the effective values for the secondary voltages are obtained, respectively.

The calculation and A / D converter 310 converts the secondary current digital signal, the image current digital signal, or the secondary voltage digital signal by A / D conversion of the instrumented secondary current rms, image current rms, or secondary voltage rms. Create each.

The controller 330 controls the secondary current digital signal, the image current digital signal, or the secondary voltage digital signal to be displayed on the connected display.

The control unit 330 generates a switching control signal when the interrupt signal is received through the interrupt unit 320, and overcurrent, leakage current, overvoltage, or shortage determined from a secondary current, an image current, or a secondary voltage determined as an abnormal value. Each notification information about the voltage is transmitted to the indicator, and each notification information is periodically controlled to be externally displayed.

The interrupter 320 receives the interrupt signal received from the amplifier and comparator 200 and stops other tasks to reduce the amount of calculation for the secondary current, the image current, or the secondary voltage provided from the amplifier and comparator, and interrupts the routine. Run

The signal output unit 340 applies the switching control signal received from the controller 330 to the solid state switch, thereby changing the switching operation of the solid state switch of the solid state switch from the on state to the off state.

Of course, when the secondary current, the image current or the secondary voltage is forcibly applied by the outside, the contactless switch that is turned off is easy to change from the off state to the ON state only when the cause is removed.

FIG. 6 is a diagram illustrating at least one semiconductor device used as a solid state switch of a cutoff control device according to an embodiment of the present invention.

Referring to FIG. 6, the solid state switch 400 is not mentioned, including an internal circuit configured triode for alternating current (TRIAC), a solid state relay (SSR), a silicon control rectifier (SCR), and an insulated gate bipolar transistor (IGBT). After detecting the zero state of the power supply provided to the cutoff control device using a semiconductor device including an active device or a passive device, the switching state of the cutoff control device can be changed from on to off or off from the contactless method. It is a device that can be forcibly changed to ON, and is automatically switched in a contactless state according to an externally applied current value or voltage value.

In other words, the contactless switch 400 performs the switching on or off operation according to the contactless switching method by controlling the zero crossing control of the trigger signal applied to the semiconductor device having the internal circuit.

Subsequently, a further additional description of each of the semiconductor devices described above is as follows.

TRIAC (triode for alternating current) is a two-way three-terminal thyristor that can control two directions, but can control the average current, so that instantaneous control or interruption of current is not possible. It is widely used for rotation speed control, temperature control of refrigerators and electric blankets.

TRIAC is a kind of switch semiconductor, and is a trade name of General Electric (GE) Corporation. Five layers of p-n-p-n-p semiconductors are superimposed. In addition to the electrodes at both ends, it has a 3rd control electrode (gate), and can control an electric current like a triode (triode). However, the average current can be controlled only by controlling the passage start of the sinusoidal alternating current, and the instantaneous amplitude control and the current interruption cannot be interrupted.

The p-n-p-n four-layer thyristor can only control the average of one-way current, while the TRIAC can control two-way. Therefore, TRIAC is widely used in the control of the rotational speed of electric motors such as household appliances, electric fans, washing machines, cooking mixers, etc. used in alternating current, temperature control of refrigerators and electric blankets.

TRIACs are often used in combination with special bidirectional diodes, diacs.

Solid state relays (SSRs) are electronic switches that do not contain moving parts, unlike electromechanical relays. Also called a solid state relay. There are two types of semiconductor relays: semiconductor relays responding to light, semiconductor relays reacting to voltage, and semiconductor relays reacting to both.

The semiconductor relay, which responds to light, is optically isolated from the load and controlled by a low voltage signal. In a semiconductor relay that responds to light, a control signal applies a voltage to the light emitting diode so that the diode responds to the light.

When the light emitting diode is turned on, a switch of a continuous thyristor, a silicon controlled rectifier, and a metal oxide semiconductor field effect transistor is connected to the load.

When voltage is applied to the control line of the semiconductor relay, light is generated from the light emitting diode and reaches the optical sensor diode. The photo sensor diode exposed to light is turned on by applying a voltage between the source and the gate of the metal oxide field effect transistor.

The semiconductor relay is constructed by connecting several metal oxide field effect transistors in parallel for one metal oxide field effect transistor or DC load.

The diode substrate inherent in all metal oxide field effect transistors is reversed. That is, one metal oxide field effect transistor cannot block current in both directions. For alternating current (two-way) operation, two metal oxide field effect transistors are arranged so that source pins are bundled together. The drain pin is connected to the output pin. The diode substrate then alternately biases to cut off the current when the relay is off. When the relay is turned on, the common source simultaneously raises the signal level and the gate is pulled higher than the source by the photodiode.

Semiconductor relays can provide connections to a common source when used for direct current loads, allowing multiple modules to be connected in parallel. When the light emitting diode is turned off, the gate discharge circuit used to increase the turn-off speed of the relay may be commonly used.

SCR (Silicon Control Rectifier) is a three-terminal semiconductor element capable of conducting a gate current between the anode A and the cathode K by flowing a gate current from the gate G to the cathode K. Also called Thyristor.

SCR has a quadruple structure of PNPN. The gate terminal is taken out from the P-type semiconductor, and the gate terminal is taken out from the N-type semiconductor.

The SCR turns on between the anode and the cathode when a constant current passes through the gate. In order to stop (turn off) the current, the current between the anode and the cathode needs to be below a certain value.

SCR is used where it is necessary to maintain the conduction state once the conduction is zero until the pass current becomes zero (such as controlling the camera's strobe). In particular, when the large power is controlled, the surge protection is excellent because the current is turned off at the timing of zero current.

An IGBT (Insulated Gate Bipolar Transistor) is a junction transistor in which a metal oxide semiconductor field effect transistor (MOSFET) is incorporated in a gate part. Since the voltage between the gate and the emitter is driven to turn on / off by the input signal, it is a semiconductor device capable of high power and high speed switching.

The IGBT has an additional P collector on the drain side of an N-channel vertical MOSFET. The injection of holes from the P collector causes conductivity modulation of the N base layer, resulting in lower resistance, which is suitable for high voltage applications compared to MOSFETs.

7 is a flowchart illustrating a method for controlling household power supply cutoff according to an embodiment of the present invention.

Referring to FIG. 7, the home power supply cutoff control method checks the state of electricity use at home in real time and performs the most stable power cutoff operation through zero crossing, as well as overcurrent cutoff, earth leakage cutoff, undervoltage cutoff and overvoltage cutoff. It is a way to protect the relay.

Instrument current transformer drops a large current (primary current) supplied from the outside to a secondary current (S10).

The video current transformer monitors an electric leakage state on a line by measuring an image current checked on a line in real time (S20).

Instrument transformer transforms the large voltage supplied from the outside to drop to the secondary voltage (S30).

The amplifier and comparator receives the secondary current, the image current or the secondary voltage and amplifies and filters the secondary current, the image current or the secondary voltage, respectively (S40 and S50).

The amplification and comparator compares the amplified and filtered secondary current, image current, or secondary voltage with a preset reference power value, respectively, to determine whether the secondary current is overcurrent, whether the image current is leakage current, or the secondary voltage is overvoltage or undervoltage. Check each of the recognition (S60, S70).

If the secondary current, image current, or secondary voltage is accidentally judged as overcurrent by the amplification and comparator, or as fault current as judged by the overvoltage or undervoltage, then the controller generates an interrupt received from the amplification and comparator. Receiving the signal to generate a switching control signal (S80, S90).

In addition, the controller receives the secondary current, the image current or the secondary voltage which are normally confirmed by the amplification and comparator, and then converts the secondary current, the image current or the secondary voltage by A / D to convert the secondary current digital signal, Generates an image current digital signal or a secondary voltage digital signal.

In addition, the controller controls the secondary current digital signal, the image current digital signal or the secondary voltage digital signal to be displayed on the connected indicator.

After receiving the switching control signal, the contactless switch detects the zero state of the power supply and changes the switching from the switched on state to the off state through the contactless method of the instrumented semiconductor device (S100).

In addition, the N branch cutoff control devices have the same configuration as the cutoff control device, and are respectively connected in parallel with the cutoff control device.

As a further operation of the method for controlling the cut-off power supply for home according to an embodiment of the present invention, the communication module transmits the secondary current digital signal, the leakage current digital signal, or the secondary voltage digital signal displayed on the indicator through a predetermined wired / wireless communication network. .

When the switching state of the semiconductor device is switched off from switching on to off, the indicator notifies the outside of the change of blocking using an internally held LED or an alarm.

The memory temporarily stores secondary current, image current or secondary voltage identified as overcurrent, leakage current, overvoltage or undervoltage, and records the correct time for the temporarily stored secondary current, image current or secondary voltage.

The clock generator continuously generates a clock signal to set a time point for generating a switching control signal by the controller as time information.

At this time, the memory records and stores predetermined time information.

Subsequently, the amplification and comparator of the cut-off control device according to the embodiment of the present invention performs the amplification and filtering comparison operation using a detailed device equipped for the secondary current, the image current or the secondary voltage, and the controller controls the switching. The signal is used to control the relay protection.

The first input receives the secondary current from the current transformer for the instrument.

The second input unit receives the image current from the image current transformer.

The third input part receives the secondary voltage from the instrument transformer.

The amplifier amplifies the secondary current, the image current or the secondary voltage.

The filter unit removes noise included in the amplified secondary current, image current, or secondary voltage, respectively.

The comparator compares the noise-reduced secondary current, image current, or secondary voltage with a reference power supply value.

The multiplexer unit determines power information indicating both the secondary current, the image current, or the secondary voltage as a normal value, and outputs the same to the controller as the secondary current, the image current, or the secondary voltage is less than or equal to the reference power value.

When the secondary current, the image current, or the secondary voltage is larger than the reference power value, and the secondary current, the image current, or the secondary voltage is determined to be an abnormal value, the interrupt signal generated by the comparison unit is transmitted to the controller.

In addition, the controller of the cut-off control apparatus according to an embodiment of the present invention performs an operation of displaying the secondary current, the image current, or the secondary voltage on the display or cutting off the power by using the apparatus having the detailed equipment.

When the arithmetic and A / D converters receive power information indicating the normally determined secondary current, image current, or secondary voltage from the multiplexer, respectively, Find the effective value respectively.

The calculation and A / D converter generates a secondary current digital signal, a zero current digital signal, or a secondary voltage digital signal, respectively, by A / D conversion of the obtained secondary current RMS value, image current RMS value, or secondary voltage RMS value.

The controller controls the secondary current digital signal, the image current digital signal, or the secondary voltage digital signal to be displayed on the connected display.

The control unit generates a switching control signal as the interrupt signal is received through the interrupt unit.

That is, when the control unit receives the interrupt signal, the controller transmits the notification information about the overcurrent, the leakage current, the overvoltage, or the undervoltage detected from the secondary current, the image current, or the secondary voltage determined as an abnormal value to the display device, thereby externally. It is notified that overcurrent, leakage current, overvoltage or undervoltage is generated, and each notification information is controlled to be externally displayed periodically.

The interrupt unit receives an interrupt signal from the amplifying and comparing unit and executes an interrupt routine that cuts off a secondary current, an image current, or a secondary voltage applied to the amplifying and comparing unit.

The signal output unit applies a switching control signal to the solid state switch to cause the solid state switch to switch from on to off.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated.

2000: Domestic power supply cutoff control system
1000: blocking control device
1000 ': N branch break control device
100: instrument current transformer 120: video current transformer
130: instrument transformer 200: amplifier and comparator
300 controller 400 solid state switch
500: Indicator 510: Memory
520: Clock Generator

Claims (16)

Instrument current transformer 100 for dropping the primary current supplied from the outside to the secondary current;
An image current transformer 110 for measuring an image current identified on a line;
Instrument transformer 120 for dropping the primary voltage supplied from the outside to the secondary voltage;
The secondary current, the image current or the secondary voltage is input to amplify and filter the secondary current, the image current or the secondary voltage, respectively, and the amplified and filtered secondary current, the image current or the secondary voltage is preset. Compared with a reference voltage value, respectively, whether the secondary current is an overcurrent, the image current is an leakage current, and whether the secondary voltage is an overvoltage or an undervoltage, respectively, generates at least one interrupt signal. Amplification and comparator 200;
When the secondary current is determined to be an overcurrent, the image current is determined to be a leakage current, or the secondary voltage is determined to be an overvoltage or undervoltage, a switching control signal is received by receiving an interrupt signal received from the amplification and comparator 200. A controller 300 for generating a; And
A contactless switch 400 which switches off from a switching on state to an off state through a contactless switching method of an instrumented semiconductor device when receiving the switching control signal;
It includes a blocking control device 1000 comprising a,
N branch blocking control devices 1000 'connected in parallel with the blocking control device 1000 and having the same configuration as the blocking control device 1000;
Further comprising:

When the controller 300 receives the secondary current, the image current, or the secondary voltage, which are normally confirmed by the amplification and comparator 200, the controller 300 receives the secondary current, the image current, or the secondary voltage. D converts the secondary current digital signal, the leakage current digital signal, or the secondary voltage digital signal, and displays the secondary current digital signal, the leakage current digital signal or the secondary voltage digital signal on the connected indicator 500. Control it,
The amplification and comparator 200,
An amplifier 240 for amplifying the secondary current, the image current or the secondary voltage;
A filter unit 250 for removing noise included in the amplified secondary current, image current, or secondary voltage, respectively;
A comparator 260 for comparing the noise-reduced secondary current, image current, or secondary voltage with the reference voltage value; And
The multiplexer unit 270 for outputting the secondary current, the image current or the secondary voltage, respectively, determined to be a normal value as the secondary current, the image current, or the secondary voltage is less than or equal to the reference voltage value, as it is. );
Including;
The comparison unit 260 generates the interrupt signal and transmits the interrupt signal to the controller 300 when it is determined that the secondary current, the image current or the secondary voltage is greater than the reference voltage value.

The controller 300,
When receiving the normally determined secondary current, the image current or the secondary voltage from the multiplexer unit 270, respectively, an effective value for the normally determined secondary current, the image current or the secondary voltage is obtained, and the obtained Computation and A / D converter 310 for generating a secondary current digital signal, an image current digital signal, or a secondary voltage digital signal, respectively, by A / D conversion of the secondary current RMS value, image current RMS value, or secondary voltage RMS value. ;
The secondary current digital signal, the image current digital signal or the secondary voltage digital signal is controlled to be displayed on the connected indicator 500, and when the interrupt signal is received through the connected interrupt unit 320, the switching control signal. The control unit 330 for generating a; And
A signal output unit 340 for applying the switching control signal to the solid state switch 400 such that the solid state switch 400 is switched from an on state to an off state;
Household power supply cutoff control system comprising a. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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