KR200212792Y1 - surge and noise multiple shelter power supply - Google Patents

Abstract

1. Technical Field

A circuit that prevents damage to all electronic and communication equipment circuits from surges coming into the AC line or ground, and also blocks switching surges and noise from external equipment or the equipment in use.

2. Challenges for the invention

In order to prevent and protect the damage of expensive equipment from lightning, grounding, electronics and communication equipment itself, and to prevent damage to expensive equipment, surge and noise from the AC line side and ground is shielded, And it provides a circuit for preventing noise from leaking to external equipment.

3. Devise this workaround

It is installed before the DC power supply of the electronic and communication equipment in use and supplies the AC power to the DC power supply, and connects the transformer primary side in series with the AC line in order to supply power while shielding it from surge or noise. Connect the DC power supply at the vehicle side. However, when a surge is introduced, a surge signal above the arrester withstand voltage is discharged to ground through the ground using an arrester attached in parallel to the transformer primary side, and the passed surge signal is applied to the transformer's multiple insulation shielding function. It is also released to ground, so that the surge signal is nearly canceled out. In addition, high frequency signal is attenuated by the filter function of inductor and capacitor when high frequency signal is inflowed to construct a circuit to prevent malfunction of equipment.

Description

Surge and noise multiple shelter power supply

The present invention has a surge signal attenuation transition rate of 1 / 10,000 or more as a surge protection function to shield multiple surges and noises coming from the power line or the ground mainly using a transformer. It has a structure to prevent accidents of other devices and human body according to the low potential of the case.

1. Description of operation of the present invention

This invention has surge and noise shielding function, but it is installed in the front of power supply or other equipment which needs AC power mainly with transformer to shield surge and noise while supplying power.

On the primary side of the transformer, surge arresters SA1, SA2, and SA3 are attached in parallel to discharge the surge current to the ground along the path of a when surges above the reference voltage of the surge arrester are introduced. Then, the potential of IG rises and is discharged in the path of b-> d, and the small amount of surge and noise which escaped this shielding is discharged along the path of c-> e. In addition, surges and noise introduced through ground shield the paths of surges and noise on the primary and secondary sides of the transformer due to the transformer's multiple shielded insulation.

2. Surge and noise blocking structure

This design, mainly composed of a transformer, is equipped with an arrester and a condenser and stored in an enclosure.The rated primary voltage is AC 110V, 220V, 380V, 440V (50 / 60Hz), and the rated secondary voltage is AC 110V, 220V. It has a transformer ratio of 380V, 440V (50 / 60Hz), and it has a multi-stage shielding function when surges or noise infiltrates, i.e., when a voltage above the reference voltage flows or when a high frequency signal flows.

2.1 grounding structure

end. IG ground: A shield plate to shield the primary winding. It is a ground for discharging the input discharge current to the ground, and has high potential during operation. Earth resistance should be less than 30 Ω .

I. SG grounding: Connected to transformer core and main body enclosure to prevent potential rise of enclosure and to discharge surge through primary shielding to earth. Install at the position close to load facility and ground resistance should be less than 100 Ω .

All. LG ground: This is a shield plate to shield the secondary winding, and it is the ground which discharges the surge passing through the primary and secondary shields to the ground. It can be installed near the load facility or as the SG ground and the common ground. Earth resistance should be less than 100 Ω .

2.2 Multiple Shielded Transformer Structure

Before winding the primary coil, shield the inside and outside with nomax (class H) insulating paper and shield with a shield plate to form IG ground. After winding the coil, shield it with a copper plate. Secondary coil is configured with LG ground in the same way, then insulated with insulating paper in the middle of the primary and secondary sides, then shielded to form SG ground.

In order to improve efficiency and light weight, the iron core used in the transformer is cut into 0.35t-thick cores in I-core type and assembled in E-core type without using the existing cores. At this time, the efficiency becomes better only by increasing the bonding, so the cut core is closely attached to the band, and then the coil wrapped with insulation paper is inserted again. Thus, efficiency and weight can be reduced.

After this configuration, as a method for improving efficiency and reducing noise in the transformer, it is dipped in a curing agent and dried at 120 ° C. for 5 hours.

2.3 Surge and noise that can be shielded as a multi-stage shielding structure

The multi-shielding surges, mainly transformers, shield the surges and noises that enter through the power lines and reverse through the ground terminals, and the surges and noises that may damage other facilities by multiple insulations and shields.

Surge through AC power line or lightning rod flows into ground, and surge and noise from nearby equipment can damage other equipment through power line or ground. This is to prevent damage to the equipment or to prevent malfunction.

There are many existing surge protection products, but there are also existing products using the surge noise shielding transformer of the present invention. However, these products not only have a small amount of surge attenuation but also do not have multiple shielding structures, so the surge shielding function is weak. Some of the surges flowing along the power line are discharged to the ground, but a large amount of surge affects the load facility. have. In addition, there is almost no shielding for surges coming through ground, and there is no filtering for noise, which is a high frequency signal.

The insulation shield function of other conventional transformers has only one level of insulation between the primary and secondary sides, and the improvement of insulation function and efficiency cannot be expected by using an evaporative curing agent.

In order to prevent the malfunction of the transmission / broadcasting equipment or to prevent malfunctions, it is necessary to shield the surges from the power line and ground side to a satisfactory level, and to filter the noise to ensure stable operation of the equipment. It is a technical task of the development of the devise.

If the surge flowing from the AC line is greater than the SA breakdown voltage, the current is discharged to the ground along the path of a through the SA. Then, the potential of IG rises and discharges through the path of b-> d through the capacitance between shield plates. In addition, it discharges to earth along the path of c-> e through the capacitance between the next shield plates.

The surge shielding and noise filtering of the transformer are implemented.

First, if the surge flows into the primary side of NCT (NOISE CUTTING TRANS) by implementing the multi-stage insulation shield function, the primary SURGE voltage flows toward the ground resistance by the ground resistance. Then, the SURGE voltage is applied across the ground resistance and the arrester operating voltage is summed to apply the voltage to the primary side of the noise cutting transformer (NCT). The SURGE voltage is discharged to SG first due to the shielding effect due to the capacitance inside the noise cutting transformer (NCT), and the remaining SURGE voltage is discharged to LG due to the shielding effect caused by the capacitance. SURGE is discharged to LG, and the remaining SURGE is discharged to IG due to the shielding effect due to the capacitance when the surge flows from the ground (LG). In addition, the surge is completely shielded with arresters and capacitors connected in parallel. Secondly, since the multi-shielded power supply uses a transformer, the power line is a low frequency signal of 60 Hz and always comes to the primary side of the transformer. When the high frequency signal flows from the power line or ground, the resonance frequency can be determined according to the resonance phenomenon determined by the internal inductor component and stray capacitance value. It is to implement LPF to cut noise signal with frequency component over resonance frequency.

By developing this surge and noise shielding function, domestic companies that have been using imported products or have used below-expected surge shielding products experience certain surge suppression function and noise filtering function. In addition, it can prevent the breakage of devices, solve the problems caused by malfunctions, and bring the effect of import substitution.

Claims (1)

Single Phase Surge Voltage Application Circuit Configuration In Fig. 1, AC power is input and the rated primary voltage is AC 110V, 220V, 380V, 440V (50 / 60Hz), and the rated secondary voltage is AC 110V, 220V, 380V, 440V. On the secondary side of the transformer [FIG. 2] having a transformer ratio of (50/60 Hz), a surge voltage blocking means for supplying power to the DC power supply and detecting a surge voltage of a predetermined voltage or more and discharging it to the earth is the first AC power line. Node N1 located on the top, Node N2 located on the second alternating current power line, a first shield between the first and second nodes and blocking surge voltage and noise, located between the second and third nodes And a surge voltage, a second shield for blocking noise, a first shield and a third shield between the first node and a third node, and a surge voltage, a third shield for blocking noise, and a surge voltage flowing from the ground at T1 and T2, Fourth shield to block out noise Surge and noise shielding circuit, which is located in the part, T, N4, N5, and is composed of a fifth shield to block switching surge and noise from the load equipment.