KR200162515Y1 - Current level display circuit - Google Patents

Abstract

The present invention relates to a current level display circuit, and more particularly, to a current level display circuit is installed in a variety of electrical and electronic devices, including breakers and outlets so that the user can easily understand the state of use of electricity.

The current level display circuit of the present invention comprises a signal amplifying means for amplifying a current detected by the current detecting means into a voltage signal and outputting the amplified voltage signal, and a signal amplified by the signal amplifying means in a comparison means. A signal comparing means for outputting through the level output means in comparison with the reference voltage, and a display means for displaying the signal inputted by the signal comparing means and displaying at least one color and multiple levels according to the height of the voltage difference. When the load current or the leakage current compared by the signal comparing means reaches the preset breaking limit current, it is output to the output indicator indicating the highest level of the output display means and the logic output gate It consists of an overcurrent confirmation signal output means for outputting through.

The current level display circuit of the above configuration is installed in breakers, outlets, and various devices so that the user of the device can visually easily grasp the presence or absence of electricity, load current, leakage current, and leakage current. In addition to efficient power management, safety accidents such as electric shocks and fires can be prevented. In addition, the performance of the product with an additional current level display circuit is further improved as described above, and the appearance is beautiful, and the side effect of enhancing the competitiveness of the product is also achieved.

Description

Current level display circuit

The present invention generally relates to a current level display circuit that can be used for all devices and systems that use electricity, electronic devices, and electric power. In particular, it is installed in various devices including breakers and outlets to level load current and leakage current to the breaking current. It can be displayed to make it easy for the user to understand the state of use and the leakage of electricity, and to output the breaking current when the load current or the leakage current reaches the set value so that the breaking circuit can be operated. It relates to a current level display circuit to prevent.

Conventionally used electric and electronic devices do not have proper electric current indication means that it is impossible to know whether the device is energized. Because of this, there were many difficulties in finding the cause of electric shock, fire hazard and failure in case of failure of equipment. In order to improve this, a display means for displaying an electric current was added to the apparatus, but it was difficult to know the degree of load, that is, the electric consumption, an overload, and an electric leakage state, by adding the electric current display means alone.

For example, current outlets that are widely used in homes do not have an indicator that can indicate whether electricity is present or not, and thus there is a risk of electric shock. In order to improve this, a switch and electric current indicating device and a fuse are installed. The electric power supply and the electric leakage state cannot be understood. There is a risk of damage and it is difficult to expect proper use of electricity by users.

In addition, the conventional circuit breaker has a problem that the user can not determine whether the breaker is energized, the load state, the current leakage state and the current leakage amount, and thus there is a risk of fire and electric shock accident.

In order to solve this problem, a number of methods and devices for overload alarms of electronic circuit breakers (patent application publication: 1996-016039) and overcurrent display devices of circuit breakers (patent application publication: 1996-019363) have been proposed. The overload alarm method and device of the circuit breaker are visually displayed through the display means when 70 to 110 percent of the rated load is energized so that the circuit breaker can identify the overload condition before the trip operation caused by the overload occurs. The overcurrent display device of the circuit breaker displays the state of the circuit breaker as a light emitting device when an overcurrent and an overload flow. However, the above two inventions have not solved the problem enough to satisfy the user because there are problems that the user cannot grasp the state of electricity supply and proper electricity consumption.

The present invention is to solve this problem, the object of the present invention is to install a current level display circuit in the circuit breaker and various devices, the user can easily enable the presence or absence of electricity, the electrical load state, that is, the load current amount, the leakage state and the leakage current amount, etc. When the load current and the leakage current reaches the set breaking limit current, the breaking circuit is operated to prevent the risk of fire and electric shock, and to efficiently manage the equipment and power.

1 is a block diagram of a current level display circuit according to a first embodiment of the present invention.

2 is a circuit diagram of a current level display circuit as a first embodiment of the present invention.

3 is a circuit diagram showing a level display means together as an embodiment of the level output circuit of FIG.

4A is a front view of a circuit breaker in which a current level display circuit as a second embodiment of the present invention is additionally installed.

4B is a front view of a circuit breaker in which a level display means is installed in a different arrangement from that in FIG. 4 as a second embodiment of the present invention.

〈Reference〉

10: load current signal amplifier, 20: leakage current signal amplifier

30: load current signal comparison unit, 40: leakage current signal amplifier

50: load current output display, 60: leakage current output display

70: over current confirmation signal output unit

300: load current level output circuit, 400: leakage current level output circuit

CT1, CT2: Current transformer, OP1, OP2: Operational Amplifier

OP3, OP4: comparator, OP5: OR gate

C1, C2, C3, C4, C5, C6: Condenser

L1-L10: Light Emitting Diode

R11-R17, R21-R27, R31, R41, R51-R55, R61-R65, R71-R77, R301-R305, R311-R316: Resistance

VR1: load reference voltage, VR2: earth leakage reference voltage

B31-B35: Buffer, B +: Power

LR: Red light emitting diode, LG: Green light emitting diode

LB: Blue light emitting diode, LY: Yellow light emitting diode

510, 520: breaker, SW: switch

511, 521: display of load current level of circuit breaker

512, 522: circuit breaker current level indication

In order to achieve this object, the present invention amplifies the current detected from the load current detecting means and the leakage current detecting means, respectively, in the load current amplifying means and the leakage current amplifying means, respectively, and outputs the amplified signals to the signal comparing means. The signal amplification means and the signal amplified by the signal amplification means are compared with each other in the load reference voltage and the load current comparison means and the leakage reference voltage and the leakage current comparison means, respectively, and output the signals through the respective level output means. Means, and sequentially output the signals inputted from the signal comparing means by load current display means and leakage current display means capable of displaying at least one color and a multi-level level according to the height of the voltage difference. The output display means and the load current and the leakage current compared in the signal comparing means Reaches the preset breaking limit current, the overcurrent of the load current or the leakage current is output to the output indicator indicating the highest level of output from the output display means and at the same time, the overcurrent confirmation signal output means for outputting the output signal through the logic sum gate. It provides a current level display circuit consisting of.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving this purpose will be described in detail.

First embodiment

1 is a block diagram of a current level display circuit as a first embodiment of the present invention, FIG. 2 is a circuit diagram of a current level display circuit, and FIG. 3 is a detailed circuit diagram of a level output.

The currents detected by the current transformers CT1 and CT2 of the signal amplifiers 10 and 20 are amplified by R15 / R12 and R25 / R22 times in the operational amplifiers OP1 and OP2, and the amplified signal acts as a buffer. Are output to the signal comparison units 30 and 40 through the capacitors C1 and C2.

The signals input from the signal amplifiers 10 and 20 are compared with the reference voltages VR1 and VR2 preset by the comparators OP2 and OP3 of the signal comparators 30 and 40 to output the level output circuits 300 and 400. The signal is sequentially applied to the level output circuits 300 and 400 in accordance with the magnitude of the signal, that is, the height of the difference between the reference voltages VR1 and VR2 and the amplified voltage signal.

Signals output from the level output circuits 300 and 400 of the signal comparator 30 and 40 are inputted to the output display units 50 and 60 so as to display light emitting diodes L1 to L5 which are display means of the output display units 50 and 60. Turn on (L6-L10).

When the amplified signal reaches the breaking limit current, the light emitting diodes L5 and L10 indicating the highest level of the output display means, that is, the overcurrent are turned on, and the capacitors C5 and C6 and the resistors R71 and R72 connected in series are respectively turned on. ) Is output to the logic sum gate OP5 of the overcurrent confirmation signal output unit 70, and the signal input to the logic sum gate OP5 of the overcurrent confirmation signal output unit 70 is again an overcurrent blocking circuit (not shown). Is output.

As described above, in the first embodiment, the current level is divided into five stages, but the current level stage may be further subdivided or the stage may be reduced as necessary. It is relatively easy to add or subtract the current level step as described above, and it will generally be determined according to the type of equipment used and the size of the load. In addition, according to the use and need of the device, a circuit may be formed by the signal amplifier 10, the signal comparator 30, and the output display unit 50 in the current level display circuit, or the signal amplifier 10 may be used. The circuit may be configured by the signal comparator 30, the output display unit 50, and the overcurrent confirmation signal output unit 70.

Second embodiment

4A and 4B are front views of the circuit breaker provided with the current level display circuit of the present invention. In FIG. 4A, the load current level display and the leakage current level display are arranged side by side under the switch of the circuit breaker. They are arranged side by side with the switch of the breaker in the longitudinal direction. In addition to the arrangement of Figs. 4A and 4B, the current level display means, i.e., the light emitting diode, can be arranged in various arrangements. In general use, as shown in Figs. 4A and 4B, the color of the current level display light emitting diodes varies according to the current level, and the arrangement of the colors of the level display light emitting diodes of the load current and the leakage current is different. By installing the current level display circuit in the breaker which is used in many industrial sites and homes, the user can easily understand whether electricity is being supplied, the load state and the short circuit state, and prevent the risk of an accident. In addition to the proper use of electricity, power management and the management of equipment using electricity can be efficiently performed.

Third embodiment

Current level indicator circuits can be installed and used in electrical outlets, the most common electrical appliances used in homes and offices. Since the outlet has a much higher contact frequency with the general user than the breaker, when the current level display circuit is installed and used in the outlet, it can be said to have a much greater effect than the breaker of the second embodiment.

The current level display circuit of the present invention can be used not only for the circuit breaker of the second embodiment and the outlet of the third embodiment, but also for various electric apparatuses and power supply panels, and machines and devices that use electricity. Various modifications can be made by those skilled in the art.

As described in detail above, the present invention is installed in various electric devices and various devices, including breakers and outlets, so that the user can grasp the presence or absence of electricity, the load current amount, the leakage state and the leakage current amount, and the like. When it flows, it outputs breaking current so that the circuit of the equipment can be operated to protect the machinery and equipment.

Claims (1)

The current detected from the load current detecting means CT1 and the leakage current detecting means CT2 is respectively amplified by the load current amplifying means OP1 and the leakage current amplifying means OP2, respectively, and the amplified respective signals are compared with the signal comparing means. Signal amplifying means (10, 20) for outputting to (30, 40); Each level output means 300, 400 is compared by comparing each signal amplified by the signal amplifying means 10, 20 in the load reference voltage and the load current comparing means and in the leakage reference voltage and the leakage current comparing means, respectively. Signal comparing means (30, 40) for outputting through; The signal comparison means 30, 40 compares each input signal sequentially by load current display means and leakage current display means capable of displaying at least one color and multiple levels according to the height of the voltage difference. Output display means (50, 60) for outputting; When the load current and the leakage current compared in the signal comparison means 30 and 40 reach a preset breaking limit current, the overcurrent of the load current or the leakage current indicates the highest level of the output in the output display means 50 and 60. And an overcurrent confirmation signal output means (70) for outputting the output signal to the output indicator and outputting the output signal through the logic sum gate (OP5).