KR20040099202A - Electronic Switches and Uninterruptible Electronic Automatic Transfer Switches with Power Switching Semiconductor - Google Patents

Abstract

PURPOSE: An electronic switch and an uninterruptable electronic automatic transfer switch are provided to suppress surge voltages and reduce power consumption, and prevent vibrational noises. CONSTITUTION: An electronic switch comprises input terminals for applying input power; a switching unit(50) having a power switching semiconductor; an input voltage detection terminal of a control unit(60); an output voltage detection terminal of the control unit; an input/output voltage detection common terminal of the control unit; an output current detection terminal of the control unit; the control unit for controlling the switching unit and having functions of operating/fault display, warning, and protection; light emitting diodes and a buzzer for alarming faults; and output terminals.

Description

Electronic Switch and Uninterruptible Electronic Automatic Transfer Switches with Power Switching Semiconductor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to switches and transfer switches used in a power system, and more specifically, to a conventional electromagnetic switch (10) and an electromagnetic automatic transfer switch (20). Electronic Switches that improve power quality, product life and reliability by applying power switching semiconductors (SCR, TRIAC, etc.) to mechanical contact / separation interaction based on the electromagnet driving principle 30 and an Uninterruptible Electronic Automatic Transfer Switch 40.

In general, the electromagnetic switch 10 and the electromagnetic automatic switch 20 have input power (main power, KEPCO, emergency power) at the input terminals (①-③: main power input and KEPCO power input, ②-③: emergency power input). When applied, power (main power supply, KEPCO power supply, emergency power supply) to coils (14: main power supply and KEPCO power supply, 24: emergency power supply) wound in a fixed direction on a fixed iron core (13: main power supply and KEPCO power supply, 23: emergency power supply) When the fixed iron cores (13: for main power supply and KEPCO power supply, 23: emergency power supply) are electromagnetized, the movable iron cores (12 for main power supply and KEPCO power supply, and 22: emergency power supply) are electromagnetized. And contacts (11: for main power supply and KEPCO power supply, 21: emergency power supply) which are integrally connected with the movable iron cores (12: for main power supply and KEPCO power supply, 22: for emergency power supply) while moving toward the KEPCO power supply and 23 for emergency power supply. Input and output contact terminals (⑤ and ⑥, ⑦ and ⑧) are connected respectively. It is a device that energizes input (main power, KEPCO power, emergency power) and output (common). Especially, automatic switching machine automatically transfers to emergency power in case of power failure of KEPCO power, and provides continuous power to the load stage. It is a device for retransmission to the power supply side.

In order to help explain and understand the drawings, the same basic driving principle and structure are shown together with the switch and the switch.

Hereinafter, the electromagnetic switch 10 and the electromagnetic automatic switch 20 according to the prior art will be described with reference to the drawings.

1 is a circuit diagram of an electromagnetic switch 10 and an electromagnetic automatic switch 20 according to the prior art. First, the electromagnetic switch 10 of the prior art has an input terminal (①-③, main power input), input / output contact terminals (⑤, ⑥, main power input / output), contactors (for main power supply), movable iron cores (12: main Power supply), fixed iron core (13: main power supply), fixed iron core coil (14: main power supply) and the output terminal (④-③), specifically, the main power input terminal (①, main power input) is the input contact terminal (⑤), and the fixed core coil 14 (for main power source) is wound in a fixed direction to the fixed core (13: for main power source) in a fixed direction (13: for main power source) to form an integral (electromagnet) fixed iron core coil (14 One end is connected to the main power input terminal (①, main power input), and the other end of the fixed iron coil (14: main power) is connected to the common input / output terminal (③), and the fixed iron core is applied when the input power (main power input) is applied. Coil 14 supplies the driving power, and output contact terminal (⑥) is connected to output terminal (④, main power output), contactor (11: main power source) For) is the armature (12: consists positioned integrally on top of the main power supply). The electromagnetic switch 10 according to the related art configured as described above has a fixed iron core (12: for the main power source) of the movable iron core (12: for the main power source) according to whether or not an input power source (main power source) is applied to the fixed iron core coil 14 (for the main power source). The input side (main power source) is formed by contacting / disconnecting the input / output contact terminals (⑤, ⑥) of the contactor 11 (for main power source), which is integrally formed with the movable iron core (12: for main power source) by being contacted / disconnected with the main body. ON / OFF operation of the electromagnetic switch 10 which connects / transfers the input) to the output side (main power output) is made.

However, the electromagnetic switch 10 of the prior art has the following problems.

First, rust is generated due to oxidation caused by the humidity of the fixed core 13 and the movable core 12, and the contact 11 and the input / output contact terminal (⑤) due to poor contact between the fixed core 13 and the movable core 12 (⑤). And (6) melt and fusion due to an increase in contact resistance due to a poor contact of the electromagnetic switch 10 causes a failure / defect, and

Second, the vibration and noise caused by the application of the input power of the fixed iron core coil 14,

Third, since the opening / closing operation is not performed when the phase of the voltage is 0 ^o , the lifetime of the contact 11 and the input / output contact terminals ⑤ and ⑥ are shortened due to the generation of high arc, and the quality of the output power is reduced. Problems of deterioration (surge voltage generation), and (breakdown of load equipment insulation and malfunction of precision equipment)

Fourthly, when the input voltage is applied out of the range of the rated voltage (80 to 110%), there is a problem of promoting insulation deterioration of the fixed core coil 14 and lowering the mechanical opening and closing durability,

Fifth, the power is continuously supplied to the fixed core coil 14 to maintain the operation of the electromagnetic switch, so that the power loss occurs (for example, 70A electromagnetic switch for 5W power consumption)

Sixth, the operation time of the electromagnetic switch (fixed core coil 'on' → main contact 'on') is 10ms ~ 90ms, the response speed is delayed,

Seventh, the problem that the fire occurs in the electromagnetic switch when the overload,

Eighth, the problem of having to replace the whole product in case of breakdown of the electromagnetic switch,

Ninth, problems that are limited by the electromagnetic switch installation environment, (e.g. mounting angle, elevation, shock, vibration, etc.)

Tenth, there is a problem that device life exists due to the mechanical operation of mechanical components.

Next, the electromagnetic automatic switching machine 20 of the prior art has two input terminals (①-③: KEPCO power input, ②-③: emergency power input), input / output contact terminals (⑤-⑥: KEPCO power input / output, ⑦-⑧: Emergency power input / output), contactor (11: KEPCO power supply, 21: emergency power supply), movable iron core (12: KEPCO power supply, 22: emergency power supply), fixed iron core (13: KEPCO power supply, 23: emergency power supply) ), The fixed iron core coil (14: KEPCO power supply, 24: emergency power supply) and the common output terminal (④-③), such as the configuration of the electromagnetic switch 10 in relation to the main power input and output configured in relation to the emergency power supply Input terminal (②-③: emergency power input), I / O contact terminal (⑦-⑧: emergency power input / output), contactor (21: emergency power supply), movable iron core (22: emergency power supply), fixed iron core (23: Emergency power) and fixed iron core coil (24: emergency power) are additionally configured, and when the KEPCO power failure occurs, it is automatically switched to emergency power and continues at the load stage. A power and a device to retransfer to KEPCO KEPCO's power supply side power suit on display. Specifically, the KEPCO power input terminal (①, KEPCO power input) is connected to the input contact terminal (⑤), the fixed core coil 14 (for KEPCO power) is wound in a fixed direction to the fixed iron core (13: KEPCO power) One end of the fixed iron core coil (14: for KEPCO power supply) is connected to the KEPCO power input terminal (①, KEPCO power input) and the other end of the fixed iron core coil (14: for KEPCO power supply) Is connected to common input / output terminal (③) to supply driving power for fixed core coil (14: KEPCO power) when input power (KEPCO power input) is applied, and output contact terminal (⑥) is output terminal (④, KEPCO / Emergency power output), and the contactor (11: for KEPCO power supply) is integrally located on the upper part of the movable core (12: for KEPCO power supply) to apply input power (KEPCO power supply) to the fixed core coil (14: for KEPCO power supply). Contact with fixed iron core (13: for KEPCO power supply) of movable iron core (12: for KEPCO power supply) Due to being separated, the input side (KEPCO power input) by the input / output contact terminals (⑤, ⑥) of the contactor 11 (for KEPCO power supply) which is integrally formed with the movable iron core (12: for KEPCO power supply) and interlocked ON / OFF operation of the KEPCO power component of the electromagnetic automatic switcher 20 is connected to the output side (KEPCO power output), and the emergency power component of the electromagnetic automatic switcher is emergency power input terminal (②, emergency). Power input) is connected to the input contact terminal (⑦), and the fixed core coil (24: for emergency power) is wound around the fixed core (23: for emergency power) in a fixed direction and integrated with the fixed iron core (23: for emergency power) (electromagnet) One end of the fixed core coil (24: emergency power) is connected to the emergency power input terminal (②, emergency power input), and the other end of the fixed iron core coil (24: emergency power input) is connected to the common input / output terminal (③). Fixed iron core coil (24 :) when power (emergency power input) is applied Phase power supply) Drive power is supplied, and output contact terminal (⑧) is connected in common with output contact terminal (⑥) and output terminal (④, KEPCO / Emergency power output) of KEPCO power component, and contactor (21: for emergency power) Silver is constructed integrally with the upper part of the movable core (22: for emergency power), and the movable core (22: for emergency power) is fixed depending on whether or not the input power (emergency power) is applied to the fixed core coil (24: for emergency power). Due to the contact / separation with the iron core (23: for emergency power supply), the contact / separation result of the contact 21 and the input / output contact terminals (⑦, ⑧) which are integrally formed with the movable iron core (22: for emergency power) are interlocked. Thereby, the ON / OFF operation of the emergency power component of the electromagnetic automatic switching machine 20 which connects / transmits the input side (emergency power input) to the output side (emergency power output) is made. The electromagnetic automatic changer 20 having the above-described configuration comprises the input / output contact terminals ⑤ and ⑥ of the KEPCO power component contactor 11 (for KEPCO power supply) and the emergency power component contactor 21 after the separation result. By supplying emergency power to the load terminal by automatically switching from KEPCO power source to emergency power output terminal (④, KEPCO / Emergency power output) according to the contact result of I / O contact terminals (⑦, ⑧) After the separation of the I / O contact terminals (⑦, ⑧) of the emergency power component contactor 21, the result of the contact with the I / O contact terminals (⑤, ⑥) of the KEPCO component contactor (11: for KEPCO power) This is a device that automatically switches over from the emergency power source to the KEPCO power source by output terminal (④, KEPCO / Emergency power output) to restore the KEPCO power to the load terminal.

However, the electromagnetic automatic transfer machine of the prior art adds the following problem to the problem of the electromagnetic switch of the prior art.

First, since the transfer time to the emergency power takes 20ms ~ 90ms during the power failure of the KEPCO power supply, there is a problem that a momentary power failure occurs when supplying the power of the load stage, so that reliable power supply such as the operation stop of the load equipment cannot be supplied.

In order to solve the above problems, the present invention provides an electronic switchgear and an automatic stepless switching machine for power switching semiconductors (SCR, TRIAC, etc.) and power switching semiconductors (SCR, TRIAC, etc.) and devices (electronic switchgear and non-stationary electrons). The control unit 60 for the control of the automatic transfer device is configured to generate an arc due to the conduction / blocking operation at a voltage phase of 0 ^o of the power switching semiconductor (SCR, TRIAC, etc.) by the operation / stop signal of the control unit 60. It improves the power quality of the power system and improves the reliability / life of the product by eliminating the fundamental factors, and in particular, shortens the operation time (from 10ms to 90ms → 2us to 5us) to 1 / 0,000 and transfer time (20ms to 90ms → 0.5). By shortening ms) to one hundredth of a second, it realizes fast and reliable power supply switching / switching without interruption of power supply (uninterrupted), and realizes reduction of holding power (for example, 70A electromagnetic switch: 5W → 70A electronic Switchgear: power saving with 50mW) It is possible to replace parts in case of failure and to reduce the convenience of maintenance and cost, and to secure the safety of current and prevent the occurrence of fire by safe control of accident current by self control in case of power system accident (over current, short circuit and ground fault). It aims at the convenience of use and monitoring with the function of normal / failure status display and notification of the product.

1 is a circuit diagram of an electromagnetic switch and an automatic electromagnetic switch according to the related art.

Figure 2 is a triac of the electronic switch and the stepless electronic automatic transfer machine according to the present invention

Applicable circuit diagram

Figure 3 is a reverse parallel of the electronic switch and the stepless electronic automatic switching machine according to the present invention

Schematic diagram of applied thyristor module

Description of the main symbols in the drawings

10: electromagnetic switch, 20: electromagnetic automatic switching machine, 30: electronic switch,

40: Stepless electronic automatic changer, 50: Switching part (SCR, TRIAC, etc.),

60: control unit 60, IN _A1 : main power, KEPCO power IN _A2 : emergency power

In order to achieve the above object, the electronic switch 30 and the stepless electronic automatic switcher 40 of the present invention are input terminals (①-③: main power input and KEPCO power input, ②-③: emergency power input), power switching Switching unit 50 (A1: for main power supply and KEPCO power supply, A2: for emergency power supply) applying a semiconductor (SCR, TRIAC, etc.), input voltage detection terminal (⑪: main power input detection and KEPCO power input detection, ⑫: emergency power input detection), output voltage detection stage of control unit 60, input / output voltage detection common stage of control unit 60, current transformer for detecting output current (CT) ) And the output current detection stage (⑨, ⑩) of the control unit 60, the switching semiconductor (SCR, TRIAC, etc.) 50 for the power of the switching unit and the apparatus (electronic switchgear and the stepless electronic automatic switcher) 30 (40) ) Control and operation / failure status display function, warning / failure notification function, controller 60 for protection function, and output terminal (④-③) And it characterized in that.

FIG. 2 is a circuit diagram of a triac (TRIAC), which is a switching semiconductor for power, applied to a switching unit of an electronic switch and an automatic automatic switchgear according to the present invention. FIG. It is a circuit diagram which applies the anti-parallel configuration thyristor module (SCR MODULE) which is a switching semiconductor for power in a switching part, and all the structures and an operation principle are the same. In order to help the description and understanding in detail with reference to Figure 2 applying the triac (TRIAC), the switching semiconductor for power to the switching unit, the electronic switch of the present invention is the main power input terminal (①, main power input) for the main power supply One end T ₂ of the switching unit triac A1 is connected, and the other end T ₁ of the main unit switching unit triac A1 is connected to the output terminal ④, the main power output unit. The main power operation / stop signal input terminal G ₁ of the evil A1 is connected to the main power operation / stop signal output terminal G _{O1 of the} control unit 60 to operate / stop (ON / OFF) signals of the control unit 60. One end (T ₂ ) and the other end (T ₁ ) of the main triangular switching unit triac (A1) are connected / disconnected from the input side (main power input) to the output side (main power output) by means of semiconducting conduction / blocking. ON / OFF operation of the electronic switch 30 is made, the main power input voltage detection of the control unit 60 The terminal (공통) is commonly connected to the main power input terminal (①, main power input) and one end (T ₂ ) of the main power switching unit triac (A1), the input of the control unit 60 connected to the common input and output terminals (③) The output voltage detection stage detects the main power input state together with the output voltage detection common stage, and the output voltage detection stage of the controller 60 is the other end of the output terminal (4, main power output) and the main power switching unit triac (A1). Input and output voltage detection of the control unit 60 connected in common with (T ₁ ) and the common input and output terminals (③) together with the common terminal (상태) detects the main power output status and the input / output of the main power supply is normal. If the main power supply normal operation indicator LED (OA1) of the control unit 60 is turned on and in the case of a fault condition, the main power failure status indicator LED (XA1) is turned on and a warning sound is generated at the warning / failure notification (BUZZER, 'BZ'). Current transformer CT for output current detection is connected to the output current detection stages (⑨, ⑩) of the controller 60 before output. Controller detects a fault and generates a warning sound on the overload warning LED (OVER LOAD, 'OL') of the control unit 60 and the warning / failure notification (BUZZER, 'BZ') to the user and controls the stop signal (OFF) at the same time. The main power supply operation / stop signal output terminal G _O1 connected to the main power supply operation / stop signal input terminal G ₁ of the main power supply operation / stop signal input terminal G ₁ of (60) to be applied to the main power supply switching unit triac A1. One end (T ₂ ) and the other end (T ₁ ) of the circuit break the input side (main power input) from the output side (main power output) by semiconductor blocking, protecting the device (electronic switch) and load equipment and preventing fire. Further, by applying the operation / stop signal of the control unit 60 to the main power operation / stop signal input terminal G ₁ of the main power switching unit triac A1, one end of the main power switching unit triac A1 (T _2). ) And the other end (T ₁ ) eliminates the generation of high energy arc (ARC) by applying the operation / stop signal of the control unit 60 to 0 ^o (ZERO-CROSSING) when the voltage phase of the main power is applied. It can improve the power quality to load equipment, guarantee the operation of load precision equipment, and prevent burnout (insulation breakdown).

Next, the stepless electronic automatic transfer device of the present invention is applied to two input terminals (①-③: KEPCO power input ② ②-③: emergency power input), the switching unit 50 applying the power switching semiconductor (SCR, TRIAC, etc.) ( A1: KEPCO power supply, A2: emergency power supply), input voltage detection terminal (⑪: KEPCO power input detection, ⑫: emergency power input detection) of the control unit 60 for detecting the input voltage, output voltage detection terminal of the control unit 60 (Iii), the input / output voltage detection common stage of the control unit 60, the current transformer CT for output current detection, the output current detection stage (⑨, ⑩) of the control unit 60, and the switching of power for the switching unit. Operation control of semiconductor (SCR, TRIAC, etc.) 50 and device (electronic switchgear and non-stationary electronic automatic switcher) 30, 40, operation / failure status display function of the device, warning / failure notification function, protection function In accordance with the configuration of the electronic switchgear 30 related to the main power input and output as configured by the control unit 60, and the output stage (④-③) for the emergency Input terminal (②-③: emergency power input) configured in relation to power source, switching unit 50 (A2: emergency power source) to which switching power semiconductor (SCR, TRIAC, etc.) is applied, and control unit 60 for detecting emergency power input voltage Input voltage detection terminal (⑫: emergency power input detection), emergency power normal / fault status LED (OA2, XA2) and emergency power operation / stop signal output terminal (G _O2 ) of the control unit 60 is further configured Therefore, it is a device that supplies reliable power to the load stage by automatically switching to the emergency power supply without interruption (no step) in case of power failure. Specifically, the KEPCO power input terminal (①, KEPCO power input) is connected to one end (T ₂ ) of the switching unit triac A1 for the KEPCO power supply, and the other end (T ₁ ) of the switching unit triac A1 for the KEPCO power supply. ) Is connected to the output terminal (④, KEPCO / emergency power output), the KEPCO power operation / stop signal input terminal (G ₁ ) of the KEPCO power switching unit triac (A1) is the KEPCO power operation / stop of the control unit 60 One end (T ₂ ) and the other end (T ₁ ) of the switching unit triac A1 for the KEPCO power supply, depending on whether the ON / OFF signal of the control unit 60 is connected to the signal output terminal G _O1 . ) ON / OFF operation of the KEPCO power supply component of the stepless electronic automatic switcher 40 which connects / disconnects the input side (the KEPCO power input) to the output side (the KEPCO power output) by semiconductor conduction / blocking. The KEPCO power input voltage detection terminal (60) of (60) is for KEPCO power input terminal (①, KEPCO power input) and KEPCO power switching. One end of the triac (A1) (T ₂₎ and the common is connected to the common input and output terminals (③) and the input of the control unit 60 connected to the output voltage detected common terminal (⑭) detect and control the Korea Electric Power input condition, as The output voltage detecting terminal (60) of (60) is connected in common with the output terminal (④, KEPCO / emergency power output) and the other end (T ₁ ) of the switching section triac A1 for KEPCO power supply, and has a common input / output terminal (③). The KEPCO power output state is detected along with the common input / output voltage detection common stage of the control unit 60 connected to the control unit 60. Lights on OA1) and in case of a fault condition, the KEPCO power status LED (XA1) lights up and generates a fault sound in the warning / failure notification (BUZZER, 'BZ'), and the current transformer (CT) Connected to the output current detection stage (⑨, ⑩) of the control unit 60 detects the output current and overload of the control unit 60 Warning signal LED (OVER LOAD, 'OL') and warning / buzzer (BUZZER, 'BZ') to the user and alarm signal at the same time, the stop signal (OFF) is output to the KEPCO power operation / stop signal of the control unit 60. _One end (T ₂ ) and the other end (T ₂ ) of the KEPCO power supply switching unit triac A1 is applied to the KEPCO power supply operation / stop signal input terminal G ₁ of the KEPCO power supply switching unit triac A1 connected to the terminal G _O1 . T ₁ ) disconnects the input side (KEPCO power input) from the output side (KEPCO power output) by semiconductor blocking, protecting the device (uninterruptible electronic automatic switch) and the load equipment and preventing fire,

In addition, the stepless electronic automatic switcher 40 emergency power component is connected to the emergency power input terminal (②, emergency power input) is connected to one end (T ₂ ) of the emergency power switching unit triac (A2), the emergency power switching unit The other end T ₁ of the triac A2 is commonly connected to the other end T ₁ of the switching unit triac A1 and the output terminal ④ (main / emergency power output) of the KEPCO power supply, and the emergency switching unit triac The emergency power operation / stop signal input terminal G ₂ of (A2) is connected to the emergency power operation / stop signal output terminal G _{O2 of the} control unit 60 to operate / stop (ON / OFF) of the control unit 60. Depending on the presence or absence of a signal, one end (T ₂ ) and the other end (T ₁ ) of the emergency switching unit triac (A2) turn the input side (emergency power input) to the output side (emergency power output) by semiconductor conduction / blocking. Emergency power ON / OFF operation of the stepless electronic automatic switcher to connect / disconnect is made, and the emergency power input voltage test of the controller 60 is performed. Stage (⑫) emergency power supply input terminal (②, emergency power input) and one end (T ₂₎ and the common is connected to the common input and output terminals (③) and a control unit 60 connected to the emergency power supply switching unit triac (A2) In addition to the common input and output voltage detection, the emergency power input state is detected together with the output voltage detection stage of the controller 60. The output terminal (4, KEPCO / Emergency power output) and the emergency power switching unit tri The emergency power output is detected by detecting the emergency power output state together with the common input (검출) of the input / output voltage detection of the control unit 60 connected in common with the other end (T ₁ ) of the evil (A2) and connected with the common input / output terminal (③). If the input / output of the power supply is normal, the emergency power normal operation indicator LED (OA2) of the control unit 60 lights up. If the fault condition is detected, the emergency power failure status indicator LED (XA2) lights up simultaneously with the warning / failure notification (BUZZER, 'BZ') generates a fault sound, and the current transformer CT for detecting the output current detects the output current of the controller 60. Connected with (⑨, ⑩) to detect output current and overload warning LED (OVER LOAD, 'OL') of control unit 60 and warning / buzzer (BUZZER, 'BZ') generating sikimyeo input at the same time the emergency power operation of the stop signal (OFF), the control unit 60 / stop signal output terminal (G _O2) with emergency power supply operation / stop signal of the associated emergency power supply switching unit triac (A2) terminal (G ₂₎ One end (T ₂ ) and the other end (T ₁ ) of the emergency switching unit triac (A2) is applied to the device by disconnecting the input side (emergency power input) from the output side (emergency power output) by semiconductor blocking. However, it can protect the fire and protect the electronic equipment and the load equipment.

The stepless electronic automatic changer 40 of the above configuration is connected to the emergency power operation / stop signal input terminal G _{2 of the} emergency power component emergency switch triac A2 at the same time (no step) when power failure of the KEPCO occurs. One end (T ₂ ) and the other end (T ₁ ) of the triac (A2) for emergency power switching unit is applied to the output terminal (④, KEPCO / emergency power output) by applying the operation signal of the control unit (60). Emergency power is supplied to the load stage without interruption and automatic switching from KEPCO power to emergency power.Emergency power operation / stop signal input terminal of the triac (A2) of the emergency power switching unit for emergency power when the KEPCO power is restored. G ₂ ) by applying the stop signal of the control unit 60, one end (T ₂ ) and the other end (T ₁ ) of the emergency power switching unit triac (A2) at the same time with the semiconductor cutoff result, the KEPCO power supply unit KEPCO power supply switching unit KEPCO power operation / stop signal of triac (A1) The operation signal of the control unit 60 is applied to the input terminal G ₁ so that _one end T ₂ and the other end T _{1 of the} switching unit triac A2 for the KEPCO power supply are output terminals ④, KEPCO / Emergency Power Output) provides uninterrupted automatic transfer of the KEPCO power to the load stage by making an automatic transition from emergency power to KEPCO power.

In addition, the voltage phase of the synchronized KEPCO power source and emergency power is automatically applied when the operation / stop signal of the control unit 60 is applied at 0 ^o (ZERO-CROSSING) during automatic switching of KEPCO power source and emergency power. It improves the reliability of, improves the power quality to the load equipment by eliminating the occurrence of arc of high energy, guarantees the operation of the load precision equipment, and prevents damage (insulation breakdown).

As described above, the electronic switch and the stepless electronic automatic changer of the present invention are applied to the switching unit 50 for power switching semiconductors (SCR, TRIAC, etc.) to ensure the life of the product, the operation time and transfer time By shortening the power supply realization (KEPCO power supply and emergency power supply) and the conduction / blocking operation at the voltage phase of 0 ^o , it eliminates the fundamental factors of arc generation, thereby improving the power quality of the power system and reliability / life of the product. It is possible to reduce the power consumption and to realize the reduction of maintenance power (e.g. 70A electromagnetic switch: 5W → 70A electronic switch: 50mW). Safety of accident current by self control in case of overload and power system accident (overcurrent, short circuit and ground fault) by applying current transformer CT for current detection and output current detection stage (⑨, ⑩) of controller 60 A block is possible, and so prevent the safety and fire, can come household use and convenience of the management by the operation of the control / fault status display, a warning / notification failure, protection.

Claims (2)

Input terminals (①-③: main power input and KEPCO power input, ②-③: emergency power input) and power switching semiconductors (SCR MODULE, TRIAC, etc.) The applied switching unit 50 (A1: for main power supply and KEPCO power supply, A2: for emergency power supply), and the input voltage detection terminal (⑪: main power input detection and KEPCO power input detection, ⑫: Emergency power input detection), the output voltage detection stage of the control unit 60, the input / output voltage detection common stage of the control unit 60, the current transformer CT for controlling the output current and the control unit ( Operation of the output current detection stage (9, 9) of the switching unit 60, the switching semiconductor for power (SCR, TRIAC, etc.) 50 and the device (electronic switchgear and non-stage electronic automatic switcher) 30, 40 of the switching unit. Control unit 60 for control and device operation / failure status display, warning / failure notification and protection functions, and display the operation / failure status of the device. Electronic switchgear and stepless electronic automatic switching, comprising an LED (OA1, OA2, XA1, XA2, OL), a buzzer (BUZZER, BZ) for warning / failure, and an output stage (④-③) group The method of claim 1, wherein the operation of the power switching semiconductor (SCR, TRIAC, etc.) of the switching unit 50 during the switching / switching / switching (ZERO CROSSING CONTROL) conduction / blocking operation at the voltage phase of the input power 0 ^o Electronic switchgear and stepless electronic automatic transfer machine, characterized in that can control the