KR970006423Y1 - Over voltage interrupting device - Google Patents

Abstract

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Description

Operation device after overvoltage cut-off of dual voltage equipment

1 is a basic circuit diagram of the AC part of the present invention

FIG. 2 is a circuit diagram of the first embodiment of the present invention, in which the operating voltage and the load voltage of the relay Re are approximated.

3 is a circuit diagram of a second embodiment of the present invention, in which the relay Re operates with a D.C voltage and the load operates with a voltage induced in a separate terminal.

4 is a circuit diagram of a third embodiment of the present invention.

Circuit diagram when operating by winding the power supply for relay operation and the power supply for load operation

* Description of the symbols for the main parts of the drawings *

ST1-ST6: Glow Starter F1-F10: Fuse

T1-T3: Trans / Blocker T4-T5: Trans Secondary Terminal

SW: Power switch S. SW: Voltage selector switch

BD1, 2: Bridge type rectifier VRD: Varistor for making contact flame

C1-C5: Electrolytic Capacitors R1, R3: Smoothing Resistance

R2, R4: Natural action resistance Re1, Re2: Relay wheel

Re, SW1, 2: relay contact

In order to obtain stable DC or AC power by reducing and rectifying the AC voltage according to the load rating, the present invention does not affect the load end even if excessive voltage is applied to the primary power supply. It relates to the structure of a direct current power supply (or transformer).

In case of incorrectly selecting the power supply voltage or incorrectly operating the power supply voltage selection switch in a conventional double voltage device, a conventional device is usually connected with only fuses or no fuses, for example, 110 volts, 220 volts, and positive voltages. When the voltage selector switch (S. SW) is connected to 110 volts and the voltage is connected to 220 volts, the transformer (TR1-TR3) is burned out or the load (L1, L2, L3, L4) connected to the secondary side of the transformer is There were many cases of severe damage, and even if the fuse was adopted, it had a very bad effect on the load until the time the fuse was blown out as overcurrent. , Even in case of overvoltage protection device of dual voltage of 220 volts (No. 89-8688 of November 30, 1989), if the overvoltage power is connected with SW off, the load is not damaged. It can block the circle but in an ON state by the SW time for the device (ST1) paragraph had the disadvantage that the voltage applied to the load.

Therefore, in the present invention, the fuse (F2-F10) connected to the primary side of the transformer (TR) and the device that operates at a voltage higher than a certain level, that is, the glow starter (ST 2-7) are mutually cross-connected to each other so that the reliability of the overvoltage blocking circuit To increase the voltage and rectify the voltage on the transformer (TR1, 2, 3) secondary side, and delay the supply of DC power to the load side during the operation time of the blocking circuit (F2-F10). Capacitors C2, C7, and C8 connected in parallel with the relay windings Re1, 2, and 3 by further DC through the smoothing resistors R1, R1 ', and R1 "and capacitors C1-C6 by the supplied DC voltage. And delayed operation by resistors R2, R2 'and R2 "connected in series, the contact is closed only after the overvoltage is lost due to the delayed operation of the relay even if the rectified DC voltage is applied. Fuse damage of overvoltage by momentary mistake of handler It can be prevented by disconnection only. In Fig. 3, it is used for AG load, and it is a case where varistor (VRD) is used to protect the contact between the contacts (Re. SW).

In general, in the relay having a plurality of contacts, if the contacts of the relay are connected in parallel, it is also a useful design that can prevent the malfunction due to the contact failure that may occur.

Claims (2)

The fuse (F2, F3, F5, F6, F8, F9) and the glow starter (ST2-ST7) are cross-connected to the low voltage terminal (T2, T3, or T1, T2) on the transformer primary side in a dual-use equipment. On the transformer secondary side, the capacitors (C2, C7, C8) are connected in parallel with the rectifier elements (BD1, 2, 3), the smoothing capacitors (C1-C6) and the relays (Re 1, 2, 3). R2 ', R2 ") connected in series and operating device after over-voltage cut-off of positive voltage device by connecting contact protection device (VRD) between relay (Re SW) of relay. In paragraph 1, some of the transformer windings are connected to the delayed operating power supply of the conversion relay to D.C, and the other windings are connected to the load through the relay contacts, and then operated after overvoltage cut-off of the dual voltage combined equipment.