KR20010011081A - Three phase compensator - Google Patents

Abstract

PURPOSE: A three phase correcting apparatus is provided to correct a phase by detecting a change of a phase and generating an output signal when an input three phase power supply is open or the direction of a phase changes . CONSTITUTION: A sensor(200) receives and switches an external three phase alternating current power supply of 220V through 480V and insulates an alternating current power. An open phase detector(300) receives the signal switched by the sensor(200) and senses and controls whether the signal from the sensor(200) is intercepted. A negative phase detector(400) receives the signal from the sensor(200) and detects directions of three phases. A noise removing circuit(500) outputs an original signal after performing charge and discharge operations in order to remove a noise included in the signal from the negative phase detector(400).

Description

Three phase compensator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase corrector, and in particular, to check the input three-phase power always (check) when the direction of the phase is changed or phased out, and relates to a three-phase corrector to always apply a constant three-phase power.

In general, a three-phase compensator uses an operational amplifier or MICRO processor, which increases the price of the product. In addition, when using a microprocessor, hardware and software are used. If there is no organic operation of the) there was a problem that a malfunction occurs.

The present invention is to solve the conventional problems as described above, the three-phase compensator to automatically correct the phase by generating an output signal by always detecting their changes when the input three-phase power is missing or the direction of the phase is changed To provide.

The three-phase compensator of the present invention for achieving the above object, the sensing unit for insulating the AC power while switching (switching) receiving a three-phase AC power of 220V to 480V from the outside, and in the sensing unit An imaging detector for detecting and controlling a signal when the signal output from the sensing unit is blocked, a reverse phase detection unit for detecting a 3-phase direction by receiving a signal output from the sensing unit, and outputting from the reverse phase detection unit Characterized in that the noise removal circuit for outputting the original signal after charging and discharging to remove the noise (noise) contained in the signal.

1 is a detailed circuit diagram of a three-phase corrector of the present invention,

2 is a timing chart for each point in FIG.

<Explanation of symbols for main parts of drawing>

200: sensing unit 202: first photo coupler

204: second photocoupler 206: third photocoupler

300: imaging detection unit 302: first inversion unit

304: second inverting portion 306: third inverting portion

400: reverse phase detection unit 402: first inversion unit

404: flip-flop 500: noise reduction circuit

502: first inverting portion 504: second inverting portion

Hereinafter, the above-described contents will be described in detail through an embodiment according to the present invention.

1 is a detailed circuit diagram of a three-phase compensator of the present invention, a sensing unit 200 for insulating AC power while switching and receiving a three-phase AC power supply of 220V to 480V from the outside, and the sensing Receiving a signal that is switched in the unit 200 receives the signal output from the sensing unit 200 and the image detection unit 300 to detect and control when the signal output from the sensing unit 200 is blocked 3 Reverse phase detection unit 400 for detecting the direction of the image, and noise removal circuit 500 for outputting the original signal after charging and discharging to remove the noise component included in the signal output from the reverse phase detection unit 400 Consists of

In addition, the sensing unit 200 includes resistors R1, R2, and R3 connected in series to each of the three-phase power supplies, and a diode D1 having a cathode terminal connected to the resistor R1. And a first photo coupler 202 connected to the diode D1 to switch the front and rear ends thereof to be insulated, and a diode having a cathode terminal connected to the resistor R2. D2), a second photocoupler 204 connected to the diode D2 to switch the front and rear ends thereof to be insulated, and a diode D3 having a cathode terminal connected to the resistor R3. And a third photocoupler 206 connected to the diode D3 to switch the front and rear ends thereof to be insulated from each other.

The diodes D1, D2, and D3 bypass the negative portion of the AC power source to bypass the first photo coupler 202 and the second from the reverse power source. The photocoupler 204 and the third photocoupler 206 are protected.

In addition, the first photocoupler 202, the second photocoupler 204, and the third photocoupler 206 electrically insulate the input and the output, and half-wave rectify the input power supplied to the sine wave to output the terminal. To be output as a square wave.

The image detection unit 300 is connected to the emitter terminals of the first photocoupler 202, the second photocoupler 204, and the third photocoupler 206 of the sensing unit 200. R1, resistor R2 and resistor R3 for adjusting the first and second photocouplers 202, second photocouplers 204 and third photocouplers 206 of the sensing unit 200. Diodes D4, D5, and D6, each having an anode terminal connected to an emitter terminal thereof, and a first inverting unit 302 for receiving and inverting a signal output through the diode D4. ), A second inverting unit 304 that receives the inverted signal from the first inverting unit 302 and inverts again, and is connected between the first inverting unit 302 and the second inverting unit 304. And a diode D7 for preventing the reverse flow of the signal inverted by the first inverting unit 302, a capacitor C1 and a resistor R4 connected to the diode D7 to perform charge / discharge operation, and The second consists of the signal inverted by the inverting portion 304 to the third reversing portion (306) to re-invert.

The reverse detection unit 400 receives a signal output from the second photocoupler 204 of the sensing unit 200, inverts the first phase, and is connected to a clock CLK terminal of the flip-flop 404. 402 and a signal output from the first photocoupler 202 of the sensing unit 200 are connected to the K terminal, and a signal output from the third photocoupler 206 of the sensing unit 200. It is composed of a flip flop (404) connected to the J terminal receiving the input.

In the timing chart of FIG. 2, a three-phase signal is output through an AC power source (A shown in FIG. 2) of a sine wave input to an input terminal of the sensing unit 200 and a photocoupler of the sensing unit 200. Signals B, C, and D outputted with a phase difference of。 and a signal E inverting, for example, one signal C from the signals B, C, and D through the first inverting unit 402. ) And a signal (F) output after passing through a plurality of diodes (D4), (D5), and (D6), for example, when there is a phase loss in any one of the signals (B, C, and D). ), A signal (G) after inverting the signal output from the formed signal (F), a signal (H) after charging the signal output from the signal (G), and the signal (H). The signal I after inverting through the second inverting unit 304 and the third inverting unit 306 and the signal (J, K) output with the normal phase through the flip-flop 404, and normally 3 When the power is input, the signal L outputs a high signal instead of the signal F at the time of the open phase shown above, and the signal after passing the signal F is the signal G at the open phase. In the normal state, the signal M indicates a low state.

That is, as shown in FIG. 2, the signal D output from the third photocoupler 206 is always present at the falling edge of the signal E output from the first inverting unit 402. Since it is a high signal, the direction of the input three-phase signal can always be detected.

The noise canceling circuit 500 is connected to the flip-flop 404 to receive a signal output from the flip-flop 404 and is connected to the diode D8 and the diode D8 to prevent backflow. Discharged from the capacitor C2 and the resistor R5 to discharge, the first inverting unit 502 for inverting the signal passing through the capacitor C2 and the resistor R5, and the first inverting unit 502 The second inverting section 504 outputs a signal free of noise by inverting the signal again.

Preferably, the plurality of inverting units described above are constituted by NOT GATE.

When described in detail through the accompanying drawings the operation, effects on the three-phase corrector of the present invention configured as described above are as follows.

An AC voltage having a constant voltage from the outside is half-wave rectified through the first photocoupler 202, the second photocoupler 204, and the second photocoupler 204 of the sensing unit 200 to insulate the input signal from the output signal. 2, each of the signals B, C, and D is output with a phase difference of 120 degrees.

When the input signal is normally input, the signal (L in FIG. 2) passing through the diode D4, the diode D5, and the diode D6 is constantly maintained in a high state. Inverted by 302 (M) to maintain a low state.

In this way, when the low state is maintained at the G point passing through the first inverting unit 302, the signal output through the second inverting unit 304 and the third inverting unit 306 also maintains the low state. You can check the normal state.

However, in the case where an imaging occurs in any one phase of the signal output through the sensing unit 200, after passing through the diodes D4, D5, and D6 of the imaging detector 300. This is the signal F shown in FIG.

The signal F is then inverted in the first inverting section 302 (G) and becomes the signal H after being charged in the capacitor C1 and the resistor R4.

As described above, after the capacitor C1 and the resistor R4 are charged, the second inverting unit 304 and the third inverting unit 306 are inverted twice. ) Is high, and it confirms that the power is missing in any phase of the input power.

As such, if any phase is phased out or reversed phase, it can be detected by connecting to an alarm and display device (not shown) that is commonly used and outputting to the outside.

The three-phase compensator of the present invention configured as described above is an invention that improves the reliability of the device and lowers the price by using a flip-flop and a sickgate and eliminating the use of any software.

Claims (4)

The sensing unit 200 to insulate the AC power while switching and switching the three-phase AC power of 220V to 480V from the outside, and receives the signal switched from the sensing unit 200 to the sensing unit ( The phase detection unit 300 detects and controls the signal output from the 200 when the signal is blocked, the reverse phase detection unit 400 that detects the three-phase direction by receiving the signal output from the sensing unit 200, and the reverse phase detection unit. Three-phase corrector, characterized in that consisting of a noise removing circuit 500 for outputting the original signal after charging and discharging to remove the noise (noise) contained in the signal output from (400). The image detection unit 300 is connected to emitter terminals of the first photocoupler 202, the second photocoupler 204, and the third photocoupler 206 of the sensing unit 200. The resistors R1, R2, and R3 for adjusting the level of the signal, and the first photocoupler 202, the second photocoupler 204, and the third photocoupler 206 of the sensing unit 200. Diodes D4, D5, and D6, each having an anode terminal connected to an emitter terminal, and a first inverting unit 302 that receives and outputs a signal output through the diode D4. And a second inverting unit 304 that receives the signal inverted by the first inverting unit 302 and inverts again, and is connected between the first inverting unit 302 and the second inverting unit 304. A diode D7 for preventing the reverse flow of the signal inverted by the first inverting unit 302, a capacitor C1 and a resistor R4 connected to the diode D7 for charge / discharge operation, and the second And a third inversion unit (306) for inverting the signal inverted by the inversion unit (304) again. The reverse phase detection unit 400 is connected to the clock (CLK) terminal of the flip-flop 404 by receiving a signal output from the second photocoupler 204 of the sensing unit 200 inverted The first inverting unit 402 and the signal output from the first photo coupler 202 of the sensing unit 200 are connected to the K terminal, and the third photo coupler 206 of the sensing unit 200. Three-phase corrector, characterized in that consisting of a flip-flop 404 is connected to the J terminal receives the signal output from. The diode D8 of claim 1, wherein the noise removing circuit 500 is connected to the flip-flop 404 to receive a signal output from the flip-flop 404. Is connected to the capacitor C2 and the resistor R5 to charge and discharge, a first inverting unit 502 for inverting the signal passing through the capacitor C2 and the resistor R5, and the first inverting unit ( And a second inverting unit (504) for outputting a signal free of noise by inverting the signal output from the (502) again.