KR20040021132A - Electric leakage alarm concent operating an automatic cutout and reclosure using microprocessor - Google Patents

Abstract

PURPOSE: An electric leakage alarming outlet for automatically cutting electricity and re-supplying electricity by using a microprocessor is provided to monitor abnormal current and cut the current. CONSTITUTION: An electric leakage alarming outlet includes an electric leakage detector(400), an overload detector(500), a switch driver(200) for supplying and cutting electric power, and a controller(300). The controller controls the switch driver to cut the electric power when the electric leakage detector detects electric leakage, and displays an alarm message when the overload detector detects an overload. The controller controls the switch driver to provide the electric power when the electric leakage detector and overload detector do not detect abnormal current.

Description

Electric leakage alarm concent operating an automatic cutout and reclosure using microprocessor

The present invention relates to a ground fault alarm outlet that performs a car cut-off and re-entry, and more particularly, by using a microprocessor that can prevent a safety accident caused by electricity by detecting a ground fault and an overload in advance. The present invention relates to a ground fault alarm outlet that performs stage and reentry.

The outlet is connected to an external power source by plugging in one or more electrical appliances to use electrical energy. The outlet is simply formed with a plug insertion groove, and eliminates the inconvenience of preventing standby power consumption and unplugging the plug. In order to do so, there is provided a form in which a switch for turning off the power in the outlet, and various types of outlets in which various functions are combined.

As safety accidents are complicated and enlarged due to electricity, outlets that include an earth leakage cut-off function are also used to prevent safety accidents such as fire accidents, electric shocks, casualties, and property damages caused by electricity. If an abnormal current is found, the power supply is shut off.

Such an outlet may be inconvenient for the user to resume the power supply by manual operation when the current is switched to a stable state, and for example, when the user does not recognize that the power supply is cut off due to an abnormal current generation, for example, a refrigerator There is a problem in that the power supply of a home appliance that requires a continuous power supply, such as to continue to be cut off.

Therefore, the present invention is to solve such a conventional problem, the object of the present invention is to detect the supply state of the current to monitor and cut off in advance when an abnormal current occurs, to prevent safety accidents due to electricity in advance In addition, to re-supply the blocked power automatically to eliminate the inconvenience.

Another object of the present invention is to prevent unnecessary consumption of electrical energy by blocking standby power generated by plugging in a home appliance even when not in use.

Other objects and features of the present invention will be more clearly understood through the preferred embodiments described below.

1 is a front view showing a ground fault alarm outlet using a microprocessor according to the present invention to perform auto shut-off and re-insertion.

Figure 2 is a side view showing a ground fault alarm outlet using a microprocessor according to the present invention to perform the shut-off and re-insertion.

Figure 3 is a block diagram showing a control system of a ground fault alarm outlet for performing the shut-off and re-insertion using a microprocessor according to the present invention.

4 is a flowchart illustrating a ground fault alarm outlet that performs auto shut-off and re-insertion using a microprocessor according to the present invention.

A ground fault detecting unit for detecting a short circuit, an overload detecting section for detecting an overload, a switch driving unit for supplying and cutting off power, and a short circuit is detected from the ground fault detecting unit to control the switch driving unit to cut off the power. When an overload is detected, a warning message is displayed, and when an abnormal current is not detected from the ground fault detecting unit and the overload detecting unit, a control unit for supplying power by controlling the switch driving unit is characterized in that the auto shut-off and re- An earth leakage alarm outlet is provided to carry out the input.

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

1 is a front view showing a ground fault alarm outlet for performing a shut-off and re-insertion using a microprocessor according to the present invention, Figure 2 is a ground fault alarm performing a shut-off and re-entry using a microprocessor according to the present invention A side view of an outlet.

The front surface of the housing 100 includes a plug insertion groove 110 and an LED 120 indicating a power supply state and a power saving switch 130 for manually shutting off the power, and a main body 140 having a circuit in the rear thereof. Is attached.

Plug insertion groove 110 is formed at least one so that the plug can be inserted into one side of the front surface of the housing 100, one or more home appliance plug is inserted to form an electrical connection with the external power source.

One or more LEDs 120 to 126 are formed in response to a situation that may occur on the other side of the front of the housing 100, and each of the LEDs 120 to 126 is turned on / off according to the state of the current being supplied. Power supply status can be easily identified. Preferably, the LED 120 may include a normal LED 120, a leakage LED 122, an overcurrent LED 124, and a power saving mode LED 126.

The power saving switch 130 is installed on the front of the housing 100, in order to prevent the standby power is consumed, one-touch method for the user to easily cut off the power without removing the plug plugged into the plug insertion groove 110 one by one Is the switch.

The main body 140 is attached to the rear surface of the housing 100, has a circuit for a control system of a ground fault alarm outlet that performs auto shut-off and re-entry using a microprocessor according to the present invention, and is directly connected to an external power source. To power the outlet.

3 is a block diagram showing a control system of a ground fault alarm outlet that performs auto shut-off and re-insertion using a microprocessor according to the present invention.

The earth leakage detecting unit 400 detects an electric leakage leaking to the outside due to incomplete insulation or damaged facilities through an image current transformer (ZCT; not shown), and the overload detecting unit 500 is overloaded to exceed a prescribed limit. Detects through the instrument current transformer (CT; not shown).

The switch driving unit 200 supplies power to and shuts off the power by driving the switch by the control unit 300. When the short circuit occurs, the switch driving unit 200 supplies the power, and supplies the power again when the blocked power returns to a stable state again.

The controller 300 periodically monitors the supply state of power. When a short circuit is detected from the ground fault detecting unit 400, the controller 300 cuts off the power by controlling the switch driver 200, and when an overload is detected from the overload sensing unit 500. Display a warning message.

After the switch driving unit 200 shuts off the power and a predetermined time has elapsed, if an abnormal current of the short circuit and the overload is not detected from the ground fault detecting unit 400 and the overload detecting unit 500, the switch driving unit 200 is controlled. Reapply power.

In addition, the control unit 300 includes an 8-bit CPU (320) having a function of automatically controlling the entire system to configure a control system, and a ROM (ROM) for storing a program capable of operating the CPU 320; 340 and peripheral devices 360 for the CPU 320 to perform normal operations.

When the abnormality information is inputted by the program embedded in the ROM 340, the CPU 320 identifies the occurrence information, compares and determines the data, and transmits the output to the outside.

The ROM 340 may be configured as an internal ROM embedded in the CPU 320, or may be configured as an external ROM separate from the CPU 320, and may be shut down and reinserted using a microprocessor according to the present invention. In the embodiment of the ground fault alarm outlet, the internal ROM of 4 Kbytes is used.

Peripheral device 360 is necessary for the CPU 320 to perform normal operation. For example, the peripheral device 360 may include a latch, a counter, a switch, an A / D converter, a signal port, a flip-flop, a data bus, and the like. .

Preferably, in order to implement a low power consumption control system, the CPU 320 may use a CMOS type one-chip microcontroller, and peripheral devices may also operate with a power supply having a very small current of about 20 mA using a device having a current consumption of 1 mA or less at all times. This can be configured to be possible.

4 is a flowchart illustrating a ground fault alarm outlet that performs auto shut-off and re-insertion using a microprocessor according to the present invention.

When power is supplied to a ground fault alarm outlet that performs auto shut-off and re-entry using a microprocessor according to the present invention and a current flows (step S10), the power flowing to the outlet is measured (step S11), and the measured actual power Is compared with the preset limit power (step S12).

At this time, if the limit power is measured at a larger value than the actual power, it is determined that there is no abnormality in the power supply of the outlet, the power is continuously supplied, and the power is periodically measured to compare the actual power with the limit power.

In addition, if the limit power is measured at a value less than or equal to the actual power, it is determined that an abnormal current of short circuit or overload occurs according to the measured value, and a warning message is displayed to induce the user to reduce the load (step). S13).

If the load decreases through the warning message, the supply of power is continuously maintained (step S14). If the load does not decrease, the system itself cuts off the power supplied to the outlet (step S15).

After the power is cut off, when a certain time elapses, the load is reduced, and power is supplied again without user's operation (step S16).

In another embodiment of the present invention, a serial connection such as a power line modem may be configured to monitor or control the current state of the outlet such as a load amount, a short circuit, and an overload in other regions and remote locations.

The principle of operation will be described with reference to a preferred embodiment of a ground fault alarm outlet that performs shut-off and re-entry using a microprocessor according to the present invention.

When the power is turned on for the first time, the lamp in each area blinks twice in turn, 5 buzzers sound, and the blue lamp in the normal area lights up.

The limit power is set in advance to monitor the leakage of the load side at all times, and the user can set the current value at which the lamp operates and the current value at which the supply is cut off.The operation of the lamp is 10 mA and the supply is cut off. Is set to 15 mA as an example.

If the leakage value is detected more than 10mA and less than 15mA, the red lamp of the leakage area blinks, and if the leakage is reduced by user's operation, if it falls below 10mA, the lamp automatically switches to the normal mode and the blue lamp of the normal area is turned on. do.

In addition, if the leakage value is detected more than 15mA, the red LED of the leakage area is turned on and the power is cut off by the control system.After a certain period of time, the leakage current reaches a safe level of less than 10mA. If the value goes down, it will be converted to normal mode and the blue lamp will be turned on with the power on again.

In order to monitor the overload of load side at all times, set the current limit according to the power regulation per outlet, and the lamp operation is set to 14A and the supply cutoff is set to 15A.

When the current value is detected to be more than 14A and less than 15A, the red lamp in the overcurrent area blinks, and when the current amount decreases by the user's operation and falls below 14A, the lamp automatically switches to the normal mode and the blue lamp lights up.

If the current value is detected to be 15 A or more, the red lamp in the overcurrent region is turned on, the power is cut off by the control system, and if the load decreases to a safe level of less than 14 A after a certain time due to the power cut off, The unit is switched to normal mode and the blue lamp lights up with the power on again.

In the present invention, but the warning message is configured only by the operation of the lamp, in order to express a more reliable warning message can be configured to operate the buzzer sound or the buzzer sound and the lamp at the same time.

Although the above has been described with reference to the preferred embodiment of the present invention, various modifications and changes are possible without departing from the scope of the present invention. For example, in the present invention, although the outlet is directly attached to the wall, the outlet is not attached to the wall and can accommodate a plurality of plugs, and can be used as another type of outlet such as a power strip that can be used in a place away from the wall. Application is possible.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims of the patent.

As described above, the earth leakage alarm outlet using the microprocessor according to the present invention for the auto shut-off and re-entry continuously detects the supply state of the power supply, and monitors and cuts it in advance when an abnormal current occurs. Safety accidents such as fire, electric shock, human injury, and property damage can be prevented in advance. Furthermore, it contributes to public well-being and welfare.

In addition, by providing a simple one-touch power-saving switch to cut off the standby power generated by plugging in the plug even when not in use, to prevent unnecessary consumption of electrical energy, save electricity bills, plug the outlet There is an effect to alleviate the inconvenience of having to separate from.

Claims (1)

A short circuit detecting unit detecting a short circuit; An overload detection unit for detecting an overload; A switch driver for supplying and cutting off power; When a short circuit is detected from the ground fault detection unit, the switch driving unit is controlled to cut off the power, and when an overload is detected from the overload detection unit, a warning message is displayed, and if an abnormal current is not detected from the ground fault detection unit and the overload detection unit. And a control unit for supplying power by controlling the switch driving unit.