KR20060033822A - Surge protecting apparatus with counter - Google Patents

Abstract

The present invention provides a surge protection device capable of accurately counting the number of surge inflows, so that the state of a surge protection device whose operating characteristics change according to the number of surge inflows can be grasped.

The present invention for the above object includes an AC / DC conversion unit for converting the power suppressed by the surge absorbing elements into a DC power supply; A comparison voltage unit converted by the AC / DC converter to generate a proportional voltage proportional to surge inflow when surge is introduced; A comparator which receives a voltage from the comparison voltage unit and compares the voltage with a reference voltage and outputs an operation signal when a voltage input from the comparison voltage unit is higher than the reference voltage; Disclosed is a technical configuration including a surge counter unit for counting an input frequency each time the operation signal output from the comparator is input.

Surge Absorption, Varistor, Counter, Reference Voltage, Proportional Voltage

Description

Surge protecting apparatus with counter means             

1 is an overall circuit block diagram for explaining an embodiment of the present invention.

2 is a circuit diagram illustrating an example of an abnormal display circuit of the present invention.

3 is a circuit diagram for explaining an embodiment of the monitoring circuit of the present invention.

The present invention relates to a surge protection device for attenuating abnormal transient voltage, and more particularly, it is possible to accurately count the number of times the surge is introduced to identify the state of the surge protection device whose operation characteristics change according to the number of surge protection. A surge protection device is provided.

In order to protect electrical and electronic equipment against lightning and surges, surge protection systems are usually installed at the power inlet. In this case, the surge protection system is provided with a surge protection element such as a varistor that can absorb lightning and surge, but the use frequency is limited because the surge protection element has an operating characteristic that changes depending on the number of surge protection. However, the conventional surge protection system is not provided with a means for accurately determining the number of times the surge protection device reacts to the surge, so that the surge protection system substantially ignores the replacement time of the surge protection device, so that the surge protection system substantially prevents the electrical installation. There is a problem that can not function.

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a surge protection system that can accurately predict the replacement time by counting the number of times the surge protection device reacts to the surge.

Furthermore, another object of the present invention is to add a secondary protection function and a power supply stabilization function to the counting circuit so that the counting function can be reliably.

In addition, another object of the present invention is to provide a surge protection system to enable the administrator to replace accurately at the time of replacement of the surge protection device by alerting when the response number of the surge protection device reaches a predetermined number of times. It is to.

A feature of the present invention for achieving the above object is to count the number of surge inflows flowing into the surge absorption elements and the surge absorption elements that are connected to the power source to protect the electrical device connected to the power source against lightning and surge A surge protection device having a counting means, the surge protection device comprising: an AC / DC converter for converting a power source of a surge suppressed by the surge absorption elements into a DC power source; A comparison voltage unit converted by the AC / DC converter to generate a proportional voltage proportional to surge inflow when surge is introduced; A comparator which receives a voltage from the comparison voltage unit and compares the voltage with a reference voltage and outputs an operation signal when a voltage input from the comparison voltage unit is higher than the reference voltage; It includes a surge counter unit for counting the number of times each time the operation signal output from the comparison unit is input.

In the present invention, the AC / DC converter further includes a DC / DC stabilized supply means which is operated by a switching mode power supply IC (SMPS IC) to supply a constant DC voltage to the comparison unit and the surge counter unit. It is preferable.

In addition, the present invention preferably further includes a surge protection unit for suppressing excessive peak value of the surge flowing from the power source between the power source and the AC / DC conversion unit.

In the present invention, the surge protection device is preferably provided with an abnormality display portion for detecting whether the surge protection device is in a normal operating state.

In addition, in the present invention, the surge counter unit stores a predetermined number of times, and when the counted number exceeds the predetermined number, it is preferable to output an operation signal to the alarm device.

In the present invention, it is preferable that the comparison unit further comprises a display means for displaying the surge inflow state is turned on by the operation signal.

In the present invention, it is preferable that the output terminal of the comparator further includes a transmission means for driving a relay contact by an operation signal of the comparator to transmit a surge input to the outside through a communication network.

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

1 is an overall circuit block diagram for explaining an embodiment of the present invention.

When a protection circuit 10 is installed between the hot (H) wire, the neutral (N) wire, and the ground (G) wires to which power is attracted, and when lightning and surge flow from the protection circuit (10) The abnormality display circuit 20 which shows an abnormal state from the abnormal voltage which generate | occur | produces is provided, and the monitoring circuit 30 which detects and displays the frequency | count which introduces surge from the voltage between a hot wire and a neutral line is provided.

The protection circuit 10 includes a fuse (F ₁ ), a thermal sensing protector (P ₁ ) installed in series between a hot wire and a neutral wire, a varistor (VR ₁ ), which is a surge absorbing element for absorbing a surge, and a hot wire and a ground wire. Fuses installed in series (F ₂ ), thermal protection protectors (P ₂ ), varistors (VR ₂ ) as surge absorbing elements to absorb surges, fuses (F ₃ ) installed in series between the neutral and ground lines, and thermal sensing Protector (P ₃ ), it consists of a varistor (VR ₃ ) that is a surge absorption element for absorbing a surge. In this case, the fuses (F ₁ ), (F ₂ ), (F ₃ ) is for disconnection to limit the transient current when the varistors are short-circuited and the transient current flows, and the thermal sensing protectors (P ₁ ), (P ₂ ), (P ₃ ) is a kind of circuit breaker that temporarily shuts down while excessive heat is detected.

In addition, the abnormality display circuit 20 is a circuit in which LEDs for monitoring the presence or absence of abnormalities of the varistor VR ₁ and the varistor VR _{2 are} provided. When the varistors operate normally, the LED is turned on, and the varistors are short-circuited so that when the fuse is disconnected, no current flows in the varistor, so that the LEDs are turned off, so that the varistors can be determined to be normal.

In addition, the monitoring circuit 30 is installed in parallel with the single-phase power (H, N) output from the protection circuit 10, the single-phase power is introduced into the surge protection unit 31 and the surge of the surge by the protection circuit (10) The peak value of the power supply whose peak value is suppressed is again attenuated to protect the circuits connected to the rear end, and an abnormality display portion 41 indicating the normal operation state of the surge protection part 31 is provided. The output voltage of the surge protection part 31 is converted into direct current by the AC / DC converter 32, and the output of the AC / DC converter 32 is converted by the comparator 37, surge in the DC / DC converter 33. It is converted into a predetermined DC voltage for stably supplying various driving voltages of various circuit components including the counter unit 38. In addition, the DC voltage converted by the AC / DC converter 32 is input to the comparison voltage unit 35 to output a proportional voltage proportional to the input voltage, and input the result to the comparison unit 37. When the voltage of the comparison voltage unit 35 is large by comparing the reference voltage applied from the reference voltage unit 36 with the comparison voltage input from the comparison voltage unit 35, the comparison unit 37 supplies the surge counter unit 38 with the comparison voltage. The operation signal is output to allow up counting, and while the operation signal is output, an output signal is sent to the surge inflow display to indicate the surge inflow. In addition, the surge counter part 38 has a surge inflow limit number of the varistors VR ₁ , VR ₂ , and VR ₃ set. Make a warning by outputting the output signal. As a warning method, various methods using sound and light may be devised. In addition, the output from the comparator 37 allows the manager to recognize the inflow state of the surge by sound so that the manager can recognize when the surge introduced into the surge warning unit 42 is prolonged.

2 is a circuit diagram illustrating an example of an abnormal display circuit of the present invention.

The abnormality display circuit may be configured in a form, and the example shown in FIG. 2 may be configured by applying the same or slight modification to each varistor. The reverse current prevention diode D ₁ , the current limiting resistor R, and the abnormality display light emitting diode D _{2 are} formed between the neutral line from the connection point of the fuse F ₁ and the thermal sensing protector P ₁ . When the fuse is not disconnected and the normal state is maintained, the light emitting diode D ₂ remains on, but when the fuse is disconnected because the varistor VR ₁ is short-circuited, the light emitting diode D ₂ is turned off. You will know whether there is an abnormality.

3 is a circuit diagram for explaining an embodiment of the monitoring circuit of the present invention.

Between the hot wire H and the neutral wire N, a surge protection part 31 composed of a resistor R ₃₁ and a varistor VR ₄ is provided, and an abnormality display part for indicating the state of the surge protection part 31 ( 41 is composed of a diode D ₃₁ , a resistor R ₃₂ , and a baldiode D ₃₂ . Wiring and operation of the abnormality display portion 41 are made similar to those described in FIG. The voltage whose surge is suppressed by the surge protection part 31 is input to the bridge diode BD, which is the AC / DC converter 32, through a filter consisting of a capacitor C ₁ and an inductor L ₁ , and converted to DC. do. A voltage proportional to the DC power supply voltage output from the bridge diode BD is generated by the comparison voltage unit 35 and input to the non-inverting terminal of the comparison unit 37. Comparing the voltage unit 35 in proportion to the voltage applied to the voltage-dividing resistor connected between the power supply lines and ground lines of the bridge diode _{(BD) (R 33),} (R 34) and a resistance (R ₃₄₎ to the amount of light proportional In order to convert the amount of current flowing through the light receiving transistor Q ₂ and the light receiving transistor Q ₂ whose resistance value changes in proportion to the amount of light emitted from the light emitting diodes D ₃₃ and D ₃₃ , the resistance R ₄₁ ), the voltage applied to the resistor R ₄₁ is input to the non-inverting terminal of the comparator 37. In addition, the output power of the direct current DC converter 33 is applied to the collector of the light receiving transistor Q ₂ , and is applied to the zener diode Z _D1 through the resistor R ₄₀ forming the reference voltage part 31. The voltage applied to the zener diode Z _D1 is applied to the inverting terminal of the comparator 37 as a reference voltage.

A surge counter unit 38, a surge inflow display unit 39, and a surge warning unit 42 are connected to the output terminal of the comparing unit 37. The surge counter unit 38 has a rising edge of the output waveform of the comparing unit 37. The count number can be displayed by a normal counter up counted by a rising edge signal, and the set number of counts is stored internally to warn the replacement warning unit 40 at a count exceeding the set number. Output the signal.

The surge warning unit 42 is a relay operated by a voltage applied to the transistor Q ₃ operated by the output signal of the comparator 37 and the resistor R ₄₂ connected to the emitter of the transistor Q ₃ . RY ₁ and an alarm device SP operated by the relay RY ₁ . In addition, instead of the alarm device, the relay RY ₁ may be connected to an external communication network and configured to inform the surge input fact to the outside.

In addition, the surge inflow display 39 includes a current limiting resistor R ₄₄ connected to the output of the comparator 37 and the light emitting diode D _41. When the output terminal is a high signal, the light emitting diode D ₄₁ emits light. Indicates surge inflow.

In addition, the output of the bridge diode BD outputs a plurality of constant DC voltages by a DC / DC converter 33 controlled by a switching mode power supply IC (SMPS IC), thereby comparing the comparator 37 and the surge counter part. (38) Since the driving power supply such as the surge inflow display unit 39 is supplied, the elements can be stably operated even when a surge is introduced.

N1 coil is wound on the primary side of the transformer of the DC / DC converter 33, and N2, N3, and N4 coils are wound on the secondary side, and the N1 coil is an SMPS IC and elements connected thereto R ₃₅ , C ₃ , D ₃₄ and C ₄ are oscillated in an AC waveform, and AC voltages are generated at coil stages by winding ratios of N2, N3, and N4 coils, and rectified by DC by a capacitor and a diode connected to the coil stages. . In this case, N2 and N3 are windings for output power, N4 is a feedback winding, and the light emitting diode D ₃₉ connected to N4 is proportional to the amount of light emitted in proportion to the amount of current flowing through N4, and the light of the light emitting diode D ₃₉ is increased. Is input to the light receiving transistor Q ₁ of the SMPS IC to change the amount of current flowing through the light receiving transistor, thereby reducing the output voltage of N1 when an overcurrent flows and increasing the output voltage when a low current flows. Detailed description of the operation of the SMPS IC will be omitted as well-known technology.

According to the present invention having the above object and configuration, it is possible to accurately count the number of surge absorption of the varistor, which is a surge absorption element, to properly replace the varistors, thereby effectively protecting the electrical devices connected to the surge protection device. have.

In addition, by supplying stable power to the circuit components operated in the supervisory circuit by the SMPS technique, the reliability of the surge protection device is improved by allowing the circuit components to operate stably regardless of the surge inflow.

In addition, not only the number of surge inflows by the counting unit is counted, but also an alarm is issued when a number of times larger than the set number is counted to raise the alarm to the manager, thereby improving management efficiency.

In addition, it is possible to monitor the operating state of the surge and the operational state of the varistor at all times has the effect of easy management efficiency and maintenance.

Claims (7)

In the surge protection device having a surge absorption element connected to the power source to protect the electrical device connected to the power supply against lightning and surge and a counting means for counting the number of surge inflows into the surge absorption element. : An AC / DC converter for converting a power suppressed by the surge absorption elements into a DC power source; A comparison voltage unit converted by the AC / DC converter to generate a proportional voltage proportional to surge inflow when surge is introduced; A comparator which receives a voltage from the comparison voltage unit and compares the voltage with a reference voltage and outputs an operation signal when a voltage input from the comparison voltage unit is higher than the reference voltage; And a surge counter unit for counting an input frequency each time the operation signal output from the comparison unit is input. The AC / DC converter of claim 1, further comprising a DC / DC stabilization supply means operated by a switching mode power supply IC (SMPS IC) to supply a constant DC voltage to the comparison unit and the surge counter unit. Surge protection device provided with a count means, characterized in that. 2. The surge protection device of claim 1, further comprising a surge protection unit for suppressing excessive peak value of the surge flowing from the power source between the power source and the AC / DC conversion unit. The surge protection device according to claim 1, wherein the surge protection elements are provided with an abnormality display portion for detecting whether the surge protection elements are in a normal operating state. The surge protection device according to claim 1, wherein a predetermined number of times is stored in the surge counter unit, and an operation signal is output to an alarm device when the counted number exceeds the predetermined number. 6. The surge protective device according to any one of claims 1 to 5, further comprising display means for displaying a surge inflow state lit by an operation signal in the comparison unit. 6. The counting means according to any one of claims 1 to 5, wherein the output unit of the comparing unit further includes a transfer unit for driving a relay contact to transfer a surge input to the outside through a communication network. Surge protection device.

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