KR20000075186A - Outdoor unit robbery protection apparatus of separating air conditioner - Google Patents

Abstract

PURPOSE: An anti-theft mechanism is provided to reduce cost and parts count by simplifying overall control procedure and configuration. CONSTITUTION: An anti-theft mechanism comprises a compressor driving unit(220) having a relay for applying an input power to a compressor in accordance with a control signal, a voltage detection unit(170) for detecting voltage from a power line connected to the compressor, a pressure sensing unit(180) for sensing the pressure of refrigerant at an indoor unit refrigerant pipeline connected to the compressor, a micro computer(160) for applying a driving signal to the compressor driving unit, and judging whether the outdoor unit is stolen or not through the voltage and pressure detected by the pressure detection unit and the pressure sensing unit, and an alarm signal generating unit(140) for generating an alarm in accordance with a control of the micro computer.

Description

Outdoor unit robbery protection apparatus of separating air conditioner

The present invention relates to an outdoor unit anti-theft device of a separate type air conditioner, and more particularly, in a separate type air conditioner in which an indoor unit and an outdoor unit are separated, the outdoor unit anti-theft prevention of the type air conditioner can prevent the theft of the outdoor unit. Relates to a device.

As is well known, the separate type air conditioner is composed of an indoor unit installed at the indoor side and an outdoor unit installed at the outdoor side, and the outdoor unit installed at the outdoor side has a problem of frequent theft, especially in underdeveloped countries. Therefore, the conventional separate type air conditioner prevents the theft of the outdoor unit by installing a communication unit that enables communication between each microcomputer and the microcomputer in the indoor unit and the outdoor unit.

1 is a control block diagram showing an outdoor unit anti-theft device of such a conventional separate air conditioner.

The indoor unit 30 includes a key input unit 31, a temperature sensor unit 32, a display unit 33, a warning signal generator 34, a power supply unit 35, an indoor side microcomputer 36, an indoor fan drive unit 37, An indoor fan 38 and an indoor side communication unit 39 are provided.

The power supply unit 35 supplies operating power to the microcomputer 36, and the microcomputer 36 controls the respective loads 33, 34, 37, 39 of the indoor unit 30. The key input unit 31 selects a setting function of the air conditioner and inputs it to the microcomputer 36, and the temperature sensor unit 32 senses the temperature of the room and transmits the same to the microcomputer 36.

In addition, the display unit 33 displays a normal operation state and theft state, and the warning signal generator 34 generates a warning sound when the outdoor unit is stolen. The indoor communication unit 39 exchanges signals with the outdoor communication unit 41 under the control of the indoor microcomputer 36, and the indoor fan driving unit 37 controls the indoor fan 38 under the control of the microcomputer 36. Drive it.

The outdoor unit 40 is provided with an outdoor communication unit 41, an outdoor microcomputer 42, an outdoor fan driving unit 43, an outdoor fan 44, a compressor driving unit 45, and a compressor 46.

The outdoor side microcomputer 42 controls each load 41, 43, 45 of the outdoor unit 40, the outdoor fan driver 43 drives the outdoor fan, and the compressor driver 45 is the compressor 46. The outdoor side communication unit 41 exchanges a mutual control signal with the indoor side communication unit 39 under the control of the outdoor side microcomputer 42.

In the conventional anti-theft device of the separate type air conditioner according to the above configuration, when the user operates the key input unit 31 of the indoor unit 30 for cooling / heating the room, the indoor side microcomputer 36 is an indoor fan. The indoor fan is operated through the driving unit, and the outdoor unit control signal is transmitted through the indoor communication unit 39.

In addition, the transmitted control signal is received by the outdoor side communication unit 41 and transmitted to the outdoor side microcomputer 42. Therefore, the outdoor microcomputer 42 controls the compressor driver 45 and the outdoor fan driver 43 by the operation signal transmitted from the outdoor communication unit 41 to drive the outdoor fan 44 and the compressor 46. Perform air conditioning and heating operation indoors.

In addition, the indoor communication unit 39 and the outdoor communication unit 41 exchange signals with each other to determine the stolen state of the outdoor unit. That is, if a signal transmitted from the outdoor communication unit 41 is not received by the indoor communication unit 39, the indoor microcomputer 36 determines that the outdoor unit 40 has been stolen. Therefore, the indoor microcomputer 36 controls the display unit 33 and the warning signal generator 34 to display the stolen state and generates a warning sound, so that the user can recognize the theft of the outdoor unit 40.

However, the outdoor unit anti-theft device of the conventional separate air conditioner illustrated in FIG. 1 is provided with a microcomputer and a respective communication unit for communication between the microcomputers, respectively, in the indoor unit and the outdoor unit, and accordingly, the overall control operation and the configuration thereof. This complexity is required, and a large number of parts are required, resulting in a problem that the manufacturing cost is increased.

The present invention has been made to solve the above problems, the purpose of which is to provide a microcomputer only in the indoor unit to simplify the control of the indoor unit and the outdoor unit, and also to simplify the structure, and also to install the voltage detector and the pressure sensing unit together outdoor unit The present invention provides an outdoor unit anti-theft device of a separate air conditioner to prevent theft of the car.

1 is a control block diagram showing an outdoor unit anti-theft device of a conventional separate air conditioner,

Figure 2 is a control block diagram showing a preferred embodiment of the outdoor unit anti-theft device of the separate air conditioner according to the present invention,

3 is a detailed circuit diagram of an outdoor unit anti-theft device of a separate air conditioner according to the present invention;

Figure 4 is a flow chart of the outdoor unit anti-theft device of the separate air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawings

140: warning signal generator 160: microcomputer

170: voltage detection unit 171: voltage detection means

172: first signal converting means 175: first switching means

180: pressure detection unit 181: pressure sensor

182: second signal conversion means 185: second switching means

320: compressor IC1: first photocoupler

IC2: Second photocoupler ZD1: Zener diode

D1: Diode Q1: First transistor

Q2: 2nd transistor R1 ~ R8: resistance

C1 ~ C5: Capacitor

Features of the outdoor unit anti-theft device for achieving the above object, the compressor drive unit including a relay for applying power to the compressor in accordance with the applied control signal, a voltage detector for detecting a voltage in the power line connected to the compressor, A pressure sensing unit for detecting a pressure of the refrigerant in the indoor refrigerant pipe connected to the compressor, a driving signal is applied to the compressor driving unit, and the stolen state of the outdoor unit is detected through the voltage and the pressure detected by the voltage detecting unit and the pressure sensing unit. And a warning signal generator for generating a warning sound under the control of the microcomputer.

The voltage detection unit is connected to both ends of the relay to detect the voltage voltage detection means, the first signal conversion means and the first signal conversion means to insulate between the input and output by photoelectric conversion of the detection signal applied from the voltage detection means And first switching means for turning on and off according to the applied voltage to apply the voltage to the microcomputer.

In addition, the voltage detecting means is a first resistor connected in parallel to both ends of the relay to limit the detection alternating voltage, the first to remove the noise of the AC voltage connected in series to the first resistor between the both ends A capacitor, a second resistor connected in series to one end of the relay at the rear of the first resistor, a first diode connected in series to the second resistor and rectifying the detection voltage, and parallel between both ends behind the first diode A third resistor connected to the second resistor; a zener diode connected in parallel between the both ends behind the third resistor and outputting only a predetermined voltage; and a second connected in parallel between the both ends behind the zener diode to remove noise of the detected voltage. A smoothing cone connected between the both ends of the capacitor and the second capacitor in parallel to convert the detected AC voltage into a DC voltage. Includes documents,

The first signal converting means may include: a first photocoupler for photoelectric conversion of an applied voltage, a third resistor for turning on and off the first photocoupler by limiting a detection voltage applied from the voltage detecting means, and the photo; And a fourth resistor disposed in parallel on the power line connected to the coupler collector to limit the applied voltage.

The first switching means is a first transistor for repeating on and off in accordance with the voltage applied from the first signal conversion means, one end is connected to the power line between the collector and the microcomputer of the first transistor, the other end is A first collector voltage source and a first collector voltage source connected to the fourth resistor, wherein a voltage is applied to the first transistor when the first photocoupler is turned off, and a voltage is applied to the micom when the first transistor is turned off; A sixth resistor connected between the collectors of the first transistor to limit the voltage applied from the first collector voltage source, and one end thereof is connected to a power line connecting the collector of the first transistor and the microcomputer, and the other end thereof is a ground terminal; It is connected to include a fourth capacitor for removing noise of the voltage applied to the microcomputer.

The pressure sensor may include a pressure sensor configured to detect a pressure of the refrigerant in the refrigerant pipe; Second signal converting means for photoelectric conversion of the detection signal applied from the pressure sensor to insulate between input and output, and second switching means for applying voltage to the microcomputer by being turned on and off according to the voltage applied by the second signal converting means. It includes.

The pressure sensing means includes a pressure sensor for sensing the pressure of the refrigerant in the indoor refrigerant pipe connected to the compressor, and a seventh resistor for limiting the voltage applied from the pressure sensor.

In addition, the second signal conversion means is a second photo coupler for photoelectric conversion of the applied voltage, one end is connected to the power line connected to the collector of the second photo coupler, the other end is connected to the ground terminal the second photo coupler And a fifth capacitor for removing noise of a voltage applied by the second capacitor, and an eighth resistor connected in parallel to a power line connected to the collector of the second photocoupler to limit the applied voltage.

The second switching means is a second transistor that is turned on or off in accordance with the voltage applied from the second signal conversion means, one end is connected to a power line connected to the collector and the micom of the second transistor, the other end is the second A second collector voltage source connected to a resistor and applying a voltage to the second transistor when the second photocoupler is turned off; and a voltage applied to the second transistor when the second transistor is turned off; The ninth resistor and the one end connected to the collector of the two transistors to limit the applied voltage is connected to the power line connecting the collector and the microcomputer of the second transistor, the other end is connected to the ground terminal is applied to the microcomputer And a fifth capacitor for removing noise of the voltage.

The microcomputer recognizes a failure of the outdoor unit power line when the signal applied from the voltage detector is a low level signal and the signal applied from the pressure detector is a high level signal.

The microcomputer recognizes the outdoor unit theft when the signal applied from the voltage detector is a low level signal and the signal applied from the pressure detector is a low level signal.

Therefore, in the separate type air conditioner installed in the indoor and outdoor units separately in each room, inside and outside, the overall control process is prevented by theft of the outdoor unit by detecting the voltage and pressure of the outdoor unit using a single microcomputer installed in the indoor unit. And the configuration is simple, there is an effect that the manufacturing cost is lowered according to the parts.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the anti-theft device of the outdoor unit according to the present invention configured as described above will be described in detail.

Figure 2 is a control block diagram showing a preferred embodiment of the outdoor unit anti-theft device of the separate air conditioner according to the present invention.

The indoor unit 100 includes a key input unit 110, a temperature sensor unit 120, a display unit 130, a warning signal generating unit 140, a power supply unit 150, a microcomputer 160, a voltage detecting unit 170, and a pressure detecting unit. 180, an indoor fan driver 190, an indoor fan 191, an outdoor fan driver 210, and a compressor driver 220 are provided, and the outdoor unit 300 is provided with an outdoor fan 310 and a compressor 320. do. Here, the key input unit 110, the temperature sensor unit 120, the display unit 130, the warning signal generating unit 140, the power supply unit 150, the outdoor fan drive unit 210, the compressor drive unit 220, the indoor fan drive unit ( 180, the configuration of the indoor fan 190, the outdoor fan 310, the compressor 320 and the operation thereof are the same as described through the prior art, so a detailed description thereof will be omitted.

However, the voltage detector 170 of the present invention detects a voltage at a power line connected to the compressor 320 and transmits a detection signal to the microcomputer 160, and the pressure detector 180 is connected to the compressor 320. It is installed in the side refrigerant pipe (400, see Figure 3) detects the pressure of the refrigerant and transmits a detection signal to the microcomputer (160).

3 is a detailed circuit diagram of an outdoor unit anti-theft device of a separate air conditioner according to the present invention. Reference numeral 160 is a microcomputer, 170 is a voltage detector, 171 is a voltage detector, 172 is a first signal conversion means, 173 is a light emitting terminal, 174 is a light receiving terminal, 175 is a switching means, 180 is a pressure sensor, 181 is a pressure sensor 182 is a second signal conversion means, 183 is a light emitting terminal, 184 is a light receiving terminal, 320 is a compressor, 300 is a refrigerant piping, RY is a relay, R1 to R8 is a resistor, C1 to C5 is a capacitor, and C6 is a starting capacitor, D1 Silver is the first diode, ZD1 is the zener diode, Q1 and Q2 are transistors, IC1 and IC2 are photocouplers, and VCC1 and VCC2 are collector voltage sources.

As shown in FIG. 3, the starter capacitor C6 connected in parallel to one end of the compressor 320 charges and applies an initial voltage to smoothly start the compressor 320. In addition, the relay RY turns the compressor 320 on and off according to the driving signal applied from the microcomputer 160.

The voltage detecting unit 171 of the voltage detecting unit 170 is connected to a power line connected in parallel to both ends of the relay RY to be connected in series with the first capacitor C1 and the first capacitor C1 for removing noise. A first resistor R1 for limiting the voltage detected at both ends is disposed and a second resistor R2 disposed at a rear power line.

The first and second resistors R1 and R2 are applied with a high resistance of 50 kΩ or more to reduce the power applied to the power line to a predetermined voltage while the relay RY is turned off. Therefore, the voltage applied to the compressor 320 through the voltage detecting means 171 flows a very small amount of current which does not drive the compressor 320.

In addition, only the predetermined voltage and the second resistor R2 connecting both ends of the first diode D1 rectifying the detected voltage and the rear end of the first diode D1 are output to the rear of the second resistor R2. Zener diode ZD1 is disposed. In addition, there are a second capacitor C2 for removing noise of the detected voltage and a smoothing capacitor C3 for removing the pulsation of the detected voltage and converting it into a DC voltage.

The first signal converting means 172 connected to both rear ends of the smoothing capacitor C3 includes a light emitting terminal 173 for converting an electric signal into an optical signal and emitting light and an optical signal for emitting light from the light emitting terminal 173. A first photocoupler IC1 composed of a light receiving terminal 174 converting into an electrical signal is disposed.

In addition, a third resistor R3 is disposed at the front end of the first photocoupler IC1 to limit the detection voltage applied to turn the first photocoupler IC1 on and off. In addition, the collector of the first photocoupler IC1 is connected to the switching means 175, and there is a fourth resistor R4 for limiting the voltage applied from the first collector voltage source VCC1.

The first photocoupler IC1 of the first signal converting means 172 is turned on with the voltage detected by the voltage detecting means 171, and when the first photocoupler IC1 is turned on, the first collector voltage is turned first. It is applied to the emitter of photocoupler IC1 and flows to the ground terminal. However, when the first photocoupler IC1 is turned off, the first collector voltage is applied to the first switching means 175.

The AC voltage detected by the voltage detecting unit 171 is output in one direction by the first diode D1 and the zener diode ZD1 and converted into direct current by the smoothing capacitor C3. In addition, the first photocoupler IC1 is turned on when the outdoor unit 200 is not stolen by the voltage applied thereto.

The switching means 175 includes a first transistor Q1 disposed on a power line to which the collector of the first photocoupler IC1 is connected and turned on or off in accordance with a voltage applied from the first signal converting means 172. have. In addition, a first collector voltage source VCC1 is connected between the collector of the first transistor Q1 and the microcomputer 160, and is also connected between the first collector voltage source VCC1 and the power line and is connected to the first collector. There is a fifth resistor R5 that limits the voltage. In addition, a fourth capacitor C4 connected between the first transistor Q1 and the microcomputer 160 and the other end connected to the ground terminal is provided.

When the first transistor Q1 is on, the first collector voltage is applied to the emitter of the first transistor Q1 and flows to the ground terminal. When the first transistor Q1 is off, the first collector voltage is microcomputer 160. Is applied.

In addition, the pressure detecting unit 180 is disposed in the indoor refrigerant pipe 300 connected to the compressor 320 to convert the second signal into one end of the pressure sensor 181 and the pressure sensor 181 for detecting the pressure of the refrigerant. Means 182 are connected. And, the other end of the pressure sensor is applied with a power of 12V. The 12V voltage applied to one end of the pressure sensor 181 is amplified by the amplification circuit in the sensor 181 by the pressure of the refrigerant and is output to the second signal converting means 182.

The second signal converting means 182 is connected to a sixth resistor R6 for turning on and off the second photocoupler IC2 by reducing the applied voltage and a rear of the sixth resistor R6 to provide an electrical signal. There is a second photocoupler IC2 that converts the optical signal and converts the optical signal back into an electrical signal. In addition, a seventh resistor R7 is arranged to be connected to the power line of the collector of the second photocoupler IC2 to limit the voltage applied from the second collector voltage source VCC2.

The second photocoupler IC2 of the second signal converting means 182 is turned on by the voltage applied from the pressure sensor 181. When the second photocoupler IC2 is turned on, the second collector voltage is turned on by the second photocoupler IC2. The second collector voltage is applied to the second switching means 185 when the second photo coupler IC2 is turned off while being applied to the emitter of the coupler IC2 and flowing to the ground terminal.

Accordingly, since the pressure sensor 181 amplifies and outputs a voltage of 12 V applied while the refrigerant flows through the refrigerant pipe 300, the second photocoupler IC2 is turned on when the outdoor unit 200 is not stolen. It becomes a state.

The switching means 185 is disposed on a power line to which the collector of the second photocoupler IC2 is connected, and the second transistor Q2 is turned on or off in accordance with the voltage applied from the second signal converting means 182. In addition, a power line connected to the collector of the second transistor Q2 is connected to the microcomputer 160.

In addition, a second collector voltage source VCC2 is connected between the collector of the second transistor Q2 and the microcomputer 160, and is also connected between the second collector voltage source VCC2 and the power line and is connected to the second collector. There is an eighth resistor R8 that limits the voltage. A fifth capacitor C5 connected between the second transistor Q2 and the microcomputer 160 and the other end connected to the ground terminal is provided.

When the second transistor Q2 is on, the second collector voltage is applied to the emitter of the second transistor Q2 and flows to the ground terminal. When the second transistor Q2 is off, the second collector voltage is the microcomputer 160. Is applied.

Figure 4 is a flow chart of the outdoor unit anti-theft device of the separate air conditioner according to the present invention, an embodiment of the present invention will be described in more detail with reference to this.

When the user manipulates the key input unit 110, the outdoor fan 310 and the indoor fan 191 are turned on by controlling the outdoor fan driver 210 and the indoor fan driver 180 from the microcomputer 160. The relay RY of the compressor driver 220 installed in the power line connected to the compressor 320 is turned on according to the control signal of the microcomputer 160. Accordingly, power is applied through both ends of the compressor 320. Since the initial voltage is charged from the starting capacitor C6 and applied to the compressor 320, the compressor 320 is turned on and an operation indication is displayed on the display unit 130. .

As such, when the air conditioner is in use or in use, the microcomputer 160 determines whether the compressor 320 is turned on or off, and if the compressor 320 is turned on, the microcomputer 160 returns to the first step S10 and returns to the compressor. It is determined whether the operation state 320 is (S10).

If the compressor 320 is in the off state, it is determined whether the detection signal applied from the voltage detector 170 is at a low level. If it is not at the low level, the microcomputer 160 returns to the first step (S10).

That is, when the user operates the key input unit 110 to stop the separate type air conditioner, that is, when the outdoor unit 200 is stolen while the relay RY is turned off and the compressor 320 is stopped, the voltage detector 170 No voltage is detected. Therefore, the first photocoupler IC1 of the first signal conversion means 172 is turned off, and the first collector voltage flows to the first switching means 175. In the first switching means 175, since the first transistor Q1 is turned on, the first collector voltage is applied to the emitter terminal of the transistor Q1 and flows to the ground terminal. Therefore, the signal applied to the microcomputer 160 is a low level signal.

Meanwhile, if the detection signal of the voltage detector 170 is at the low level, the microcomputer 160 determines whether the detection signal applied from the pressure detector 180 is at the low level (S12).

The pressure sensor 181 of the pressure sensing unit 180 is applied to the second signal converting means 182 without the amplification of the 12V power applied to one end because the pressure of the refrigerant disappears in the refrigerant pipe 300. Then, since the pressure is reduced by the sixth resistor R6, the second photocoupler IC2 is turned off. Therefore, the second collector voltage is applied to the second switching means 185 to turn on the second transistor Q2. Therefore, the second collector voltage is applied to the emitter of the second transistor Q2 and flows to the ground terminal. Therefore, the signal applied to the microcomputer 160 is a low level signal.

If the signal applied from the pressure sensing unit 180 is not at the low level, the microcomputer 160 detects that there is an abnormality in the power line of the outdoor unit 200 and applies a display signal to the display unit 130 to display a fault. This generates a warning sound (S13) (S14). That is, if the signal applied from the voltage detector 170 is a low level signal and the signal applied from the pressure detector 180 is a high level input, it is determined that there is an error in the power supply line of the outdoor unit 200 and the display unit 130 has a failure. The display is displayed, and the warning signal generator 140 generates a warning sound.

However, if the detection signal applied from the pressure detecting unit 180 is at a low level, the power line and the refrigerant pipe 400 of the outdoor unit 200 are separated from the indoor unit 100, and theft indicator and warning sound indicating the theft of the outdoor unit is detected. (S16) (S17) (S18). That is, when a low signal corresponding to each voltage and pressure state is input from the voltage detector 170 and the pressure detector 180, the microcomputer 160 determines that the outdoor unit 200 has been stolen, and displays the theft indicator on the display unit 130. In this case, the warning signal generator 140 generates a warning sound.

Therefore, the user may recognize the theft of the outdoor unit 200 and the failure of the outdoor unit power line by the theft and failure indication displayed on the display unit 130 and the warning sound generated by the warning signal generator 140.

The outdoor unit anti-theft device of the separate type air conditioner according to the present invention is a separate type air conditioner installed in the indoor unit and the outdoor unit separately from each room, inside and outside, using a single microcomputer installed in the indoor unit voltage and Since the theft of the outdoor unit is prevented by detecting the pressure, the overall control process and configuration are simplified, and the manufacturing cost is reduced according to the reduction of the parts.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications are possible to those skilled in the art without departing from the gist of the present invention as claimed in the claims. Such changes will fall within the scope of the claims.

Claims (9)

In the outdoor unit anti-theft device of a separate air conditioner divided into an indoor unit and an outdoor unit including a compressor, A compressor driver including a relay for applying input power to the compressor according to an applied control signal; A voltage detector detecting a voltage at a power line connected to the compressor; A pressure detecting unit detecting a pressure of the refrigerant in the indoor refrigerant pipe connected to the compressor; A microcomputer that applies a driving signal to the compressor driving unit and determines a stolen state of the outdoor unit based on the voltage and the pressure detected by the voltage detecting unit and the pressure detecting unit; And The outdoor unit anti-theft device of a separate air conditioner, characterized in that it comprises a warning signal generating unit for generating a warning sound under the control of the microcomputer. The method of claim 1, wherein the voltage detector Voltage detection means connected to both ends of the relay to detect a voltage; First signal conversion means for insulating between input and output by photoelectric conversion of the detection signal applied from said voltage detection means; And And a first switching means which is turned on or off in accordance with the voltage applied by the first signal converting means to apply a voltage to the microcomputer. The method of claim 2, wherein the voltage detecting means A first resistor connected in parallel to both ends of the relay to limit the detected AC voltage; A first capacitor connected to the first resistor in series between the both ends to remove noise of an AC voltage detected; A second resistor connected in series with one end of said relay behind said first resistor; A first diode connected in series with the second resistor to rectify the detection voltage; A third resistor connected in parallel between both ends behind the first diode; A zener diode connected in parallel between the both ends behind the third resistor to output only a predetermined voltage; A second capacitor connected in parallel between both ends behind the zener diode to remove noise of a detected voltage; And The outdoor unit anti-theft device of the separate air conditioner of claim 2, further comprising a smoothing capacitor connected in parallel between the both ends at the rear of the second capacitor to convert the detected AC voltage into a DC voltage. The method of claim 2, wherein the first signal conversion means A first photocoupler for photoelectrically converting an applied voltage; A third resistor for turning on and off the first photocoupler by limiting a detection voltage applied from the voltage detection means; And The outdoor unit anti-theft device of a separate air conditioner, characterized in that it comprises a fourth resistor disposed in parallel to the power line connected to the photocoupler collector to limit the applied voltage. The method of claim 2, wherein the first switching means A first transistor for repeating on and off in accordance with the voltage applied from the first signal conversion means; One end is connected to a power line between the collector of the first transistor and the microcomputer, the other end is connected to the fourth resistor, and when the first photocoupler is turned off, a voltage is applied to the first transistor, and the first transistor is A first collector voltage source to which a voltage is applied to the microcomputer when it is turned off; A sixth resistor connected between the first collector voltage source and the collector of the first transistor to limit a voltage applied from the first collector voltage source; And One end is connected to a power line connecting the collector and the microcomputer of the first transistor, the other end is connected to the ground terminal comprises a fourth capacitor for removing noise of the voltage applied to the microcomputer Outdoor unit anti-theft device of the conditioner. The method of claim 1, wherein the pressure sensing unit A pressure sensor for sensing a pressure of the refrigerant in the refrigerant pipe; Second signal conversion means for insulating between input and output by photoelectric conversion of the detection signal applied from the pressure sensor; And And a second switching means which is turned on or off in accordance with the voltage applied by the second signal conversion means to apply a voltage to the microcomputer. The pressure sensing means of claim 6, A pressure sensor for sensing a pressure of the refrigerant in the indoor refrigerant pipe connected to the compressor; And The outdoor unit anti-theft device of a separate air conditioner, characterized in that it comprises a seventh resistor for limiting the voltage applied from the pressure sensor. The method of claim 6, wherein the second signal conversion means A second photocoupler for photoelectrically converting the applied voltage; A fifth capacitor having one end connected to a power line connected to the collector of the second photocoupler and the other end connected to a ground terminal to remove noise of a voltage applied from the second photo coupler; And The outdoor unit anti-theft device of the separate air conditioner, characterized in that it comprises an eighth resistor that is connected in parallel to the power line connected to the collector of the second photocoupler to limit the applied voltage. The method of claim 6, wherein the second switching means A second transistor that is turned on or off in accordance with a voltage applied from the second signal conversion means; One end is connected to a power line connected to the collector and the microcomputer of the second transistor, and the other end is connected to the eighth resistor, and when the second photocoupler is turned off, a voltage is applied to the second transistor. A second collector voltage source for applying a voltage to the microcomputer when the transistor is turned off; A ninth resistor connected between the second collector voltage source and the collector of the second transistor to limit an applied voltage; And One end is connected to the power line for connecting the collector and the microcomputer of the second transistor, the other end is connected to the ground terminal comprises a fifth capacitor for removing noise of the voltage applied to the microcomputer Outdoor unit anti-theft device of the conditioner.