KR200453728Y1 - Surge Protection Device - Google Patents

Abstract

The present invention relates to a surge protection device, in which a surge protection device connected to a power source is grounded when a surge voltage of a predetermined magnitude or more is introduced, the varistor to ground when a surge voltage is introduced from a power source and the internal temperature of the varistor. Indicates a surge protection unit consisting of a thermal fuse that is disconnected when the temperature rises above a certain temperature, a surge counter unit that counts the number of times the surge voltage is introduced, indicating whether the power is normal, disconnecting the temperature fuse, and indicating whether the varistor is broken. Characterized in that it comprises a display unit. In addition, the surge protection device forms a conductive thin film on both sides of the printed circuit board to provide an electrical connection path from the power source to the ground, and is formed on the upper and lower surfaces of the printed circuit board and grounded when a voltage of a predetermined size or more flows in. A conductive thin film which provides a passage electrically connected from a power source to a ground, a passage formed through the printed circuit board and electrically connected to the conductive thin film formed on the upper surface of the printed circuit board and the conductive thin film formed on the lower surface of the printed circuit board. Characterized in that comprises a through-hole to provide.
According to the surge protection device configured as described above, by using an integrated circuit composed of a current transformer, a light emitting diode, and a light receiving transistor, the surge can be accurately counted only when a surge is introduced, and a surge protection using a printed circuit board is also possible. In constructing the device, a plurality of through holes are provided in the printed circuit board to electrically connect the conductive thin films on the upper and lower surfaces of the printed circuit board to increase the cross-sectional area of the printed circuit board, thereby providing instantaneous overcurrent to the printed circuit board. There is an effect that can prevent the conductive thin film is melted or damaged.

Description

Surge Protector

The present invention relates to a surge protection device, which accurately counts the number of surges introduced and enables a circuit configuration at a low price, and a surge protection device that can be miniaturized by constructing a surge protection device using a printed circuit board. will be.

In order to protect electrical and electronic equipment against lightning and surges, surge protection devices are usually installed at power inlets. In this case, the surge protection device is provided with a surge protection device such as a varistor capable of absorbing lightning and surges, but the number of use of the surge protection device is limited because its operation characteristics change according to the number of surge intrusions. However, the conventional surge protection device does not have a means for accurately identifying 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, and thus the surge protection system substantially protects the electrical equipment against the surge. There was a problem that can not be done.

 In order to counter the number of surge inflows, a device for countering the number of surge inflows by a program and a relay has been proposed. However, the former had a problem in that a surge flowed into the driving circuit and malfunctioned, and the latter had a problem in that the counter was not accurate with respect to the surge continuously introduced.

In addition, surge protection devices generally use a flat copper wire or a thick copper conductor with a large current capacity as a conductor because overcurrent flows instantaneously.

However, when a surge protection device is constructed on a printed circuit board using a flat copper wire or a thick copper conductor, the contact between the flat copper wire or the thick copper conductor and the printed circuit board may be disconnected by external impact. Due to the volume of the copper conductor, there is a problem that it is difficult to reduce the size of the compact and difficult to assemble.

Accordingly, a structure has been proposed in which conductive thin films are formed on both sides of a printed circuit board as a conductive wire for flowing an overcurrent to the printed circuit board. However, when the instantaneous overcurrent flows in the above structure, there is a problem in that the conductive thin film formed on the printed circuit board is melted or damaged.

An object of the present invention is to solve the problems described above, and to provide a surge protection device having a surge counter that can be manufactured inexpensively using a resistor as well as being counted only when a surge is introduced.

It is still another object of the present invention to construct a surge protection device as a printed circuit board and to provide a plurality of through holes in the printed circuit board so that conductive thin films on the upper and lower surfaces of the printed circuit board are electrically connected to each other. An object of the present invention is to provide a surge protection device having a through hole which can prevent the conductive thin film from being melted or damaged even when instantaneous overcurrent is applied thereto.

The surge protection device according to the present invention is a surge protection device that is connected to a power source and grounds it when a surge voltage of a predetermined magnitude or more is introduced, wherein the internal temperature of the varistor and the varistor to ground when the surge voltage is introduced from the power source is increased. Surge protection unit consisting of a thermal fuse that is disconnected when the temperature rises above a certain temperature, a surge counter unit for counting the number of times the surge voltage is introduced, a first display unit for indicating the application of the power supply, the disconnection display of the temperature fuse and the varistor It characterized in that it comprises a second display unit for indicating whether or not a failure.

The surge counter unit may further include: a current transformer for converting current flowing through the surge protection unit, a varistor connected to the current limiter to limit voltage inflow of a predetermined magnitude or more, a surge counter for counting the number of times current flows in the surge protection unit; It is provided between the varistor and the surge counter, characterized in that it comprises a current attenuator for attenuating the current so that the current within the allowable value is supplied to the surge counter.

The surge counter may include a counter signal generator including a light emitting diode that emits light when a current flows into the surge protection part, and a light receiving transistor that emits a count signal when the light emitting diode emits light, and a count signal is input from the counter signal generator. And a surge count storage unit for counting and storing an input count each time.

In addition, the surge protection device forms a conductive thin film on both sides of the printed circuit board to provide an electrical connection path from the power source to the ground, and is formed on the upper and lower surfaces of the printed circuit board and grounded when a voltage of a predetermined size or more flows in. A conductive thin film which provides a passage electrically connected from a power source to a ground, a passage formed through the printed circuit board and electrically connected to the conductive thin film formed on the upper surface of the printed circuit board and the conductive thin film formed on the lower surface of the printed circuit board. Characterized in that comprises a through-hole to provide.

In addition, the electrically connected passage of the through hole is characterized in that the conductive thin film is formed on the inner peripheral surface of the through hole.

In addition, the conductive thin film formed on the inner peripheral surface of the through hole is characterized in that the same as the material forming the conductive thin film.

The conductive material may be an alloy of silver, copper, copper, and tin or lead.

In addition, the plurality of through-holes are formed in the printed circuit board, the diameter of the through-holes is 1.3 ~ 1.7mm and the central distance with the adjacent through-holes is characterized in that 1.9 ~ 2.3mm.

In addition, a surge detection circuit for detecting when a voltage of a predetermined size or more is introduced, a current transformer for supplying the surge detection circuit to the current flow over current, a varistor for grounding a voltage of a predetermined size or more, the conductive thin film is electrically The first conductive thin film, the second conductive thin film, and the neutral thin film separated by the first conductive thin film are connected to a power source, and the first conductive thin film and the second conductive thin film are electrically connected through copper wires. And a current transformer is positioned on the copper conductor, and the varistor is positioned between the second conductive thin film and the neutral thin film.

According to the surge protection device according to the present invention, by using an integrated circuit composed of a current transformer and a light emitting diode and a light receiving transistor, not only the surge can be accurately counted when surge is introduced, but also a surge protection device using a printed circuit board. In the configuration, a plurality of through-holes are provided in the printed circuit board to electrically connect the conductive thin films existing on the upper and lower surfaces of the printed circuit board to increase the cross-sectional area of the conductive circuit, so that the instantaneous overcurrent is applied to the printed circuit board. There is an effect that can prevent the conductive thin film is melted or damaged.

1 is a perspective view of a surge protection device according to the present invention.
2 is a circuit diagram of a surge protection device according to the present invention.
3 is a circuit diagram of a surge counter part of the surge protection device according to the present invention.
4 is a plan view of a printed circuit board of a surge protection device according to the present invention.
5 is a rear view of the printed circuit board of the surge protection device according to the present invention.
6 is an enlarged view illustrating an enlarged portion A of FIG. 4.

The present invention relates to a surge protection device having a surge counter capable of counting the number of surge inflows. The present invention relates to a surge protection device having a surge counter capable of preventing a surge from being introduced and operating a circuit at a low price. will be. In addition, the present invention has a configuration in which a conductive thin film formed on the upper and lower surfaces of a printed circuit board is electrically connected through a plurality of through holes in a surge protection device requiring a large current capacity. The present invention relates to a surge protection device capable of preventing damage to a circuit pattern due to an overcurrent by increasing the current carrying capacity in a printed circuit board.

Hereinafter will be described an embodiment of a surge protection device according to the present invention.

1 is a view showing a perspective view of a surge protection device according to the present invention, Figure 2 is a view showing the circuit diagram of Figure 1, Figure 3 is a view showing a circuit diagram for a single phase of the figure of FIG. 1 and 2, the surge protection device 10 according to the present invention includes a surge protection unit 100 for grounding a surge voltage having a predetermined magnitude or more, and a display unit for displaying the operation state of the surge protection device 10 to the outside. 200, a surge counter 300 for counting and storing the number of surge inflows, a printed circuit board 400, and a terminal 500.

As shown in FIG. 3, the surge protection unit 100 is connected to a power source for introducing a surge voltage having a predetermined magnitude or more, and grounding it. The surge protection unit 100 short-circuits the varistors VR1, VR2, VR3, and VR4 and the varistors VR1, VR2, VR3, and VR4 for grounding when a surge voltage is introduced, so that the surge protection device 10 and It consists of temperature fuses (F1, F2, F3, F4) for protecting the load (not shown) connected to the subsequent stage from the surge voltage.

In FIG. 3, the first surge protector 110 and the second surge protector 120 are respectively provided between the L phase and the N phase, which is the power line, and the PE phase, which is the N and ground lines, respectively. Accordingly, it is a matter of course that a separate surge protection unit may be provided between the L phase and the PE phase.

In the present embodiment, the first surge protector 110 and the second surge protector 120 are provided with two temperature fuses and two varistors, respectively, but the number of the temperature fuses and varistors vary according to the maximum allowable current value. Of course you can.

In addition, in the present embodiment, but described on a three-phase basis, it can be applied to single-phase, two-phase and three-phase or more power. In case of two or more phases, the power line will be L1 phase, L2 phase, between each power line (L1 phase and L2 phase), between each power line (L1 phase, L2 phase) and neutral line (N phase), and each power line The surge protection part may be provided between the (L1 phase, L2 phase) and the ground wire (PE phase), respectively. In addition, in order to prevent each power line (L1 phase, L2 phase) from being short-circuited, it is preferable to provide an insulation resistance. In this embodiment, the insulation resistance is provided at the rear ends of F1 and F2, respectively.

The display unit 200 is for displaying the operation state of the first surge protection unit 110 to the outside. The display unit 200 indicates the disconnection of the first and second thermal fuses F1 and F2 and the varistor VR1. And a second display section for indicating whether or not the VR2 is broken. In the exemplary embodiment of the present invention, the first light emitting diode D1 is used as the first display unit, and the second light emitting diode D2 is used as the second display unit.

Specifically, when both the first light emitting diode D1 and the second light emitting diode D2 are lit, the normal power is applied and the temperature fuses F1 and F2 and the varistors VR1 and VR2 are normal. ② If the first light emitting diode D1 is turned on and the second light emitting diode D2 is turned off, it indicates that the temperature fuses F1 and F2 are both disconnected or failure of the varistors VR1 and VR2. When the first light emitting diode D1 is turned off and the second light emitting diode D2 is turned on, the normal power supply and the temperature fuses F1 and F2 and the varistors VR1 and VR2 are operating normally, but the rectifier is malfunctioning. ④ If both the first light emitting diode (D1) and the second light emitting diode (D2) are turned off, normal power is not applied and it indicates the product's failure (surge protection device, etc.). .

Referring to the specific operation, in the case of ①, when power is applied to the surge protection device 10, the alternating current of the power line (L phase) and the neutral line (N phase) is converted into direct current by an AC / DC conversion means to convert the first light emitting diode ( Flowing into D1), the diode D1 is turned on. In the embodiment of the present invention, a bridge diode BD1 for converting alternating current into pulse flow and a first capacitor C1 for smoothing pulse flow were used as the AC / DC conversion means. A protection circuit for applying a constant voltage to the first light emitting diode D1 may further include a TVS diode ZD1 as shown in FIG. 2.

In addition, power is normally applied to the light emitting diode present in the first photocoupler IC1 to emit light, and the light receiving transistor present in the first photocoupler IC1 receives the light emitted from the light emitting diode. Current is induced The induced current turns on the second light emitting diode D2. Therefore, when both of the first light emitting diode D1 and the second light emitting diode D2 are turned on, the surge protection device 10 may be displayed to the outside.

In case of ②, the temperature fuses F1 and F2 are all disconnected or the failure of varistors VR1 and VR2 is displayed. do.

In case of ③, the first light emitting diode D2 is turned off because normal power is not applied to the power supply or the temperature fuses F1 and F2 and varistors VR1 and VR2 due to a normal or failure of the rectifier circuit.

In the case of ④, due to the failure of the surge protection device, normal power is not applied, so that both the first light emitting diode D1 and the second light emitting diode D2 are turned off.

The surge counter unit 300 counts and stores the number of surge inflows, which is illustrated in FIG. 4. 4 illustrates a surge counter unit 300 capable of counting the number of surges introduced into two phases. However, the circuit may be modified in a single phase or three phases or more.

The surge counter 300 includes the current transformers CT1 and CT2 for current flow, varistors VR5 and VR6 for suppressing surge voltages, and current attenuator 310 for attenuating the currents of the varistors VR5 and VR6. The second photocoupler (IC2) consisting of a bi-directional light emitting diode that emits light when it is introduced and a light receiving transistor that emits a count signal when the bidirectional light emitting diode emits light, and counts the number of signals received by receiving the count signal of the second photocoupler (IC2) Surge count storage unit 320 to store. In addition, there is a constant voltage maintaining unit including a zener diode 330 and a capacitor C2 for smoothing the second photo coupler IC2 to supply a voltage in a predetermined range.

The surge counter part 300 has a structure connected to the surge protection device as shown in FIG. That is, the power line 111 connected to the first surge protector 110 at the power terminal passes through the hollow of the current transformers CT1 and CT2. Therefore, when a current due to a surge voltage flows in the power line 111, a voltage is induced in the current transformers CT1 and CT2, thereby causing an induced current to flow in the surge counter part 300.

The power line 111 may use a copper conductor or a coin wire, and one or more conductive lines may be used according to the allowable current value. (In this embodiment, two conductive lines are used.) The line 111 is provided to electrically connect the first conductive thin film 410 and the second conductive thin film 420 that are electrically spaced apart from each other, as described below.

A detailed circuit diagram of the surge counter unit 300 is shown in FIG. 4. Referring to FIG. 4, when a current caused by induced electromotive force flows in the current transformers CT1 and CT2, the surge voltage is suppressed in the varistors VR5 and VR6 to flow the current to the current attenuation unit 310. The current attenuator 310 may include a plurality of resistors R1, R2, R3, and R4 to adjust the magnitude of the attenuated current by adjusting the plurality of resistor values. In other words, if the resistance value of R1 or R3 is decreased or the resistance value of R2 and R4 is increased, the current attenuation width transmitted to the photo coupler IC2 to be described later becomes relatively large, and vice versa. Lose. In addition, by providing R1 and R3, it is possible to prevent the potential difference between the both ends of the current transformers CT1 and CT2 from being shorted.

In the current attenuator 310 illustrated in FIG. 4, a structure in which a plurality of resistors are connected is only one embodiment. Can be configured.

The current passing through the current attenuator 310 flows into the second photocoupler IC2. When a current flows into the second photocoupler IC2, as described above, current is induced in the light receiving transistor by light emitted from the light emitting diode included in the second photocoupler IC2, and the induced current is a count signal. The surge flows to the storage unit 320. The surge count storage unit 320 counts the number of introduced currents and stores the count. A display unit (not shown) may be provided on the outside to display the surge inflow frequency at the request of the user.

FIG. 5 is a view showing the top surface 400a of the printed circuit board of the surge protection device, FIG. 6 is a view showing the bottom surface 400b of the printed circuit board of the surge protection device, and FIG. This is an enlarged view of part A enlarged.

As illustrated in FIGS. 5 and 6, the printed circuit board 400 includes conductive thin films on both sides of the printed circuit board 400 to provide a passage electrically connected from a power source to a ground. The terminal unit 500 includes a power terminal 510, a neutral terminal 520, and a ground terminal 530 to which a power line, a neutral line, and a ground line are respectively connected, and the first conductive thin film 410 and the neutral thin film 430 will be described later. ) And the third conductive thin film 440 are electrically connected to each other.

Silver, copper, copper and tin alloys or lead may be used as the material forming the conductive thin film, but various materials may be used according to the characteristics of the circuit.

In addition, as an embodiment of the present invention, the conductive thin film is illustrated as being divided into a first conductive thin film 410, a second conductive thin film 420, a neutral thin film 430, and a third conductive thin film 440. In addition, although FIG. 5 to FIG. 7 are shown based on a three-phase power source, the present invention is not limited thereto and may be applied to two-phase or multi-phase.

delete

The through hole 450 is formed by drilling the printed circuit board 400 to provide a passage electrically connected between the conductive thin film formed on the upper surface of the printed circuit board 400 and the conductive thin film formed on the lower surface of the printed circuit board 400. Is provided. The through hole 450 may be filled with a conductive material as necessary.

In order to provide an electrically connected passage, a conductive thin film 451 is formed on the inner circumferential surface of the through hole 450 as shown in FIG. 7. The conductive thin film 451 formed on the inner circumferential surface of the through hole 450 is preferably made of the same material as the conductive thin films 410, 420, and 440 in order to reduce contact resistance.

As described above, through the through-hole 450 to conduct electricity by forming a passage electrically connected between the conductive material present on the upper surface of the printed circuit board 400 and the conductive material present on the lower surface of the printed circuit board 400 The cross-sectional area is increased to increase the current capacity.

On the other hand, the surge protection device 10 according to the present invention should maximize the cross-sectional area of the conductive thin film (410, 420, 440) in order to secure the cross-sectional area to ensure the optimum current capacity and the proper workability It is related to the diameter of the ball 450 and the spacing between adjacent through holes 450.

When the conductive material was copper, as a result of repeated experiments, the diameter of the through hole 450 was 1.3 to 1.7 mm and the center distance between adjacent through holes 450 was 1.9 to 2.3 mm. Herein, the center distance means a distance between the centers of the other through holes adjacent to each other from the center of one of the through holes 450. When the diameter of the through hole 450 is 1.3 mm or less or the center distance between the through holes 450 is 1.9 mm, the coated lead is often separated. The diameter of the through hole 450 is 1.7 mm or more or the through hole ( When the center distance between 450) is 2.3 mm or more, a sufficient conduction area of the through hole 450 is not secured. As a result, the conductive material coated on the printed circuit board is melted or ruptured.

In order to verify the effect due to the through hole 450, a current of 40 kA is applied to the printed circuit board according to the present invention having the through hole 450 and the printed circuit board according to the prior art without the through hole 450. I tried to energize. In this experiment, the conductive material is lead. As a result of the experiment, the conductive material coated on the printed circuit board according to the prior art was melted or ruptured, but the conductive material coated on the printed circuit board according to the present invention did not cause the same problem as the prior art.

Since the neutral thin film 430 has a large number of curved portions as shown in FIGS. 5 and 6 and has a large resistance component, the neutral thin film 430 does not include the through hole 450 as the conductive thin films 410, 420, and 440. The lower surface of the printed circuit board 400 is preferably provided with a conductive thin film capable of applying a conductive material. For example, when lead is used as the conductive material, the thickness of the conductive material applied to the conductive thin film is preferably 0.8 mm to 1.2 mm.

In the above described exemplary embodiments of the present invention by way of example, the technical scope of the present invention is not limited only to this specific embodiment, but also to the extent that those skilled in the art can be appropriately modified and carried out. Of course it can.

10: surge protection device 100: surge protection unit
200: display portion 300: surge counter portion
400: printed circuit board 500: terminal

Claims (9)

In the surge protection device which is connected to the power source and grounds it when a surge voltage of a certain magnitude or more is introduced,
A surge protection unit comprising a varistor for grounding when a surge voltage is introduced from a power supply and a temperature fuse disconnected when an internal temperature of the varistor rises above a predetermined temperature;
A surge counter unit for counting the number of times the surge voltage is introduced;
A first display unit displaying the normal power supply state;
A second display unit displaying whether the temperature fuse is disconnected and whether the varistor is broken;
Consists of including
The surge protection device forms a conductive thin film on both sides of the printed circuit board to provide an electrical connection path from the power source to the ground,
A conductive thin film formed on an upper surface and a lower surface of the printed circuit board and providing a passage electrically connected from a power source to ground to ground when a voltage of a predetermined size or more flows in;
The printed circuit board is formed by punching the printed circuit board and the conductive thin film formed on the upper surface of the printed circuit board and the conductive thin film formed on the lower surface of the printed circuit board to provide a passage to increase the conduction area so that the large current flows through the printing A plurality of through holes formed on the circuit board;
Surge protection device characterized in that comprises a. The method of claim 1,
The surge counter unit,
A current transformer for current flowing through the surge protection unit;
A varistor connected to the current transformer to limit voltage inflow of a predetermined magnitude or more;
A surge counter for counting the number of times current flows in the surge protection unit;
A current attenuator provided between the varistor and the surge counter to attenuate a current to supply a current within an allowable value to the surge counter;
Surge protection device comprising a. The method of claim 2,
The surge counter,
A counter signal generator comprising a light emitting diode that emits light when a current flows into the surge protection part and a light receiving transistor that emits a count signal when the light emitting diode emits light;
A surge count storage unit for counting and storing an input frequency each time a count signal is input from the counter signal generator;
Surge protection device further comprising. delete The method of claim 1,
The electrically connected passage of the through hole is a surge protection device, characterized in that the conductive thin film is formed on the inner peripheral surface of the through hole. The method of claim 5,
The conductive thin film formed on the inner circumferential surface of the through hole is the same as the material of the conductive thin film. The method of claim 5,
And the conductive material is an alloy of silver, copper, copper and tin or lead. The method of claim 1,
The plurality of through holes are formed in the printed circuit board,
The diameter of the through hole is 1.3 ~ 1.7㎜ and the center distance with the adjacent through hole is 1.9 ~ 2.3㎜ characterized in that the device. The method of claim 1,
A surge detection circuit for detecting when a voltage of a predetermined size or more is introduced;
A current transformer for current supplying an overcurrent to the surge detection circuit;
A varistor for grounding a voltage of a predetermined size or more;
Include more,
The conductive thin film is composed of a first electrically conductive thin film, a second conductive thin film, a neutral thin film electrically isolated,
The first conductive thin film is connected to a power source, the first conductive thin film and the second conductive thin film are electrically connected through copper wires, and a current transformer is located on the copper wire, and the second conductive thin film and the neutral wire Surge protection device characterized in that the varistor is located between the thin film.

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