KR20040003708A - A inverter device of inverter air-conditioner - Google Patents

Abstract

The present invention relates to an inverter air conditioner, and more particularly, to an inverter device of a separate inverter air conditioner using a sensorless motor to reduce the cost of the inverter configuration. According to the present invention, by using a sensorless motor for the motor used for the outdoor unit and the outdoor unit in the inverter control configuration, and using the control means that can control the pwm, it is possible to reduce the cost of the drive element constituting the product.

Description

A inverter device of inverter air conditioner

The present invention relates to a separate inverter air conditioner, and more particularly, to an inverter device of a separate inverter air conditioner using a sensorless motor in an indoor unit and an outdoor unit.

In general, an air conditioner drives a heating cycle and a cooling cycle according to a user's request, creates a warm room in a cold winter by operation of the heating cycle, and cools a room in a hot summer by the operation of the cooling cycle. In addition, the air conditioner controls the humidity in the room, and controls the air in the room to a comfortable clean state.

The circulation cycle of the air conditioner configured as described above consists of a heating cycle when the indoor heat exchanger functions as a condenser, and constitutes a cooling cycle when the indoor heat exchanger functions as an evaporator.

1 is a schematic diagram of a cooling / heating cycle of a general air conditioner.

In the heating operation by the heating cycle, the compressor 3 first compresses the refrigerant. The compressed refrigerant is delivered to the indoor heat exchanger (1). At this time, heat is released to the indoor side by heat exchange between the refrigerant flowing in the indoor heat exchanger 1 and the indoor air, and warm wind is discharged. And the refrigerant passing through the indoor heat exchanger is sucked into the outdoor heat exchanger (2). At this time, the outdoor heat exchanger (2) performs the evaporation operation to discharge the cold wind to the outside.

In the cooling operation by the cooling cycle, the compressor 3 first compresses the refrigerant. The compressed refrigerant is delivered to the outdoor heat exchanger (2). The outdoor heat exchanger 2 condenses the delivered refrigerant and delivers the condensed refrigerant to the indoor heat exchanger 1. Therefore, as the indoor heat exchanger 1 is driven, the refrigerant absorbs heat of indoor air, and cold wind is discharged to the indoor side.

In the conventional air conditioner having the above configuration, the indoor unit fan motor and the outdoor unit fan motor are performing control using a hall sensor.

Next, a driving control method of a motor equipped with a hall sensor according to the related art will be described.

2 is a schematic cross-sectional view of a motor equipped with a hall sensor according to the prior art.

In order to detect the position of the rotor (rotor), as shown in the figure, the position of the rotor 5 is detected using the hall sensors 6, 7, and 8 between the stator windings 4, and this detection result By applying an appropriate voltage to the stator winding (4) to make the motor rotatable. At this time, in order to rotate the rotor 5 clockwise in the state where the S pole of the Hall sensor Us (6), the S pole of the Vs (7) and the N pole of the Ws (8) are detected in FIG. When (+) and (-) are applied to W phase, repulsive force is generated on the same N pole in V phase and S pole is generated on S phase in W phase. When the rotor 5 rotates, the Hall sensors Us (6), Vs At (7) and Ws (8), magnetic poles are detected in accordance with the rotational position of the rotor. Based on this, if the rotor 5 rotates at an appropriate position, the rotor 5 is continuously rotated through phase transformation of the winding. In this way it is possible to detect the position of the rotor provided in the motor.

As described above, in the conventional air conditioner, the indoor fan motor and the outdoor fan motor have a sensor built-in type. In addition, a control element for controlling the rotation of the motor by receiving a signal from the sensor, a drive drive, etc. are configured together in the motor.

Therefore, as described above, the motor equipped with the hall sensor is expensive, and as a result, the cost of controlling the product is increased, resulting in a cost burden on the user.

Accordingly, an object of the present invention is to provide an inverter device of a separate type inverter air conditioner that can obtain a cost reduction effect by applying a sensorless motor to a motor provided in an indoor unit and an outdoor unit.

1 is a cooling / heating cycle of a typical air conditioner.

2 is a schematic cross-sectional view of a motor equipped with a hall sensor according to the prior art.

3 is an inverter control apparatus of a separate inverter air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawings

10: power input terminal 20a, 20b: converter unit

30a, 30b: microcontroller 40a: inverter section

40b: first inverter section 40c: second inverter section

50: sensorless indoor fan motor 60: sensorless compressor motor

70: sensorless outdoor fan motor 80a ~ 80f: rotor position sensor

A: Indoor unit B: Outdoor unit

The interlock device of the separate inverter air conditioner according to the present invention for achieving the above object is a separate inverter air conditioner consisting of an indoor unit and an outdoor unit, the indoor unit, and a converter unit for converting into a DC power source when the AC power input; ; An inverter unit which receives the DC power from the converter unit and converts the power into three-phase power; An indoor fan motor driven by driving a three-phase power source of the inverter unit; A rotor position detector for outputting a square wave signal by comparing the counter electromotive force generated by the indoor fan motor with a reference signal; And a microcontroller configured to receive the detected signal through the rotor position detection unit and output a PWM control signal for controlling the rotor speed of the indoor fan motor to the inverter unit.

In addition, the inverter device of the separate inverter air conditioner according to the present invention for achieving the above object is a separate inverter air conditioner consisting of an indoor unit and an outdoor unit, the outdoor unit, the converter unit for converting to a DC power source when the AC power input; Wow; First and second inverter units receiving DC power from the converter unit and converting the DC power into three-phase power; an outdoor fan motor to which the three-phase power of the first inverter unit is transmitted and driven; A compressor motor in which the three-phase power of the second inverter unit is transmitted and driven; A first rotor position detector for outputting a square wave signal by comparing the counter electromotive force generated by the outdoor fan motor with a reference signal; A second rotor position detector for outputting a square wave signal by comparing the counter electromotive force generated by driving the compressor motor with a reference signal; And a microcontroller configured to receive the detected signal through the first and second rotor position detectors and output a PWM control signal for controlling the rotor speed of the indoor fan motor to the inverter unit.

Looking at the inverter device of the inverter air conditioner configured as described above are as follows.

3 is an inverter control apparatus of a separate inverter air conditioner according to the present invention.

As shown in the drawing, the indoor unit (A) and the outdoor unit (B) are configured. Looking at this in more detail, first, the (+) terminal and the (-) terminal of the power input code to which power is input in the indoor unit (A). Are connected to the (+) terminal and the (-) terminal of the converter unit 20, respectively. In addition, the microcontroller 30a is provided in the indoor unit B, and outputs a control signal for driving the indoor unit A. The inverter unit 40a is connected to one of the ports provided in the microcontroller 30a, and the inverter unit 40a is connected to the indoor fan motor 50 through a three-phase terminal. At this time, the dc voltage output from the converter unit 20a is transferred to the inverter unit 40a. And the rotor position detection unit 80a is provided on v, w between the inverter unit 40a and the indoor fan motor 50, and the rotor position detection unit 80a is shown in the drawing, the microcontroller 30a. It is connected to the position sensing ports (t1, t2) configured in.

As such, the rotor position detection unit receives the counter electromotive force generated by the motor driving, compares it with a reference value, and outputs an on signal to the microcontroller when the rotor position is higher than the reference value. In addition, when compared with the reference value, the lower signal is output to the microcontroller when the reference value is lower.

Meanwhile, the indoor unit A and the outdoor unit B are connected by a communication circuit, and the converter unit configured in the indoor unit A is connected to the converter unit 20b configured in the outdoor unit B. At this time, the (+) terminal of the indoor unit (A) converter unit 20a is connected to the (+) terminal of the outdoor unit (B) converter unit 20b. The negative terminal of the indoor unit (A) converter unit 20a is connected to the negative terminal of the outdoor unit (B) converter unit 20b.

In addition, the microcontroller 30b provided in the outdoor unit B includes two ports (pwm port1 and pwm port2) for connecting to the first inverter unit 40b and the second inverter unit 40c, respectively. . In addition, the first inverter unit 40b is connected to the compressor motor 60 through a three-phase terminal. In addition, a rotor position detection unit 80b for detecting a rotor position of the motor on v and w between the first inverter unit 40b and the compressor motor 60 is provided. The rotor position detecting unit 80b is connected to the position detecting ports s1 and s2 provided in the microcontroller 30b.

On the other hand, the second inverter unit 40c is connected to the outdoor fan motor 70 by a three-phase terminal. A rotor position detection unit 80c for detecting a rotor position of the motor is provided on v and w between the second inverter unit 40c and the outdoor fan motor 70. The rotor position detecting unit 80c is connected to the position detecting ports s3 and s4 provided in the microcontroller 30b.

The converter unit 20b converts the AC power input into the product into DC power and transfers the same to the first inverter unit 40b and the second inverter unit 40c. The first inverter unit 40b and the second inverter unit 40c convert the dc voltage transmitted from the converter unit 20b into three-phase AC power, and control switching so that the converted three-phase AC power is transferred. As a result, the compressor motor 60 and the outdoor fan motor 70 are driven and controlled.

At this time, the microcontroller 30b outputs a control signal such that the first inverter unit 40b and the second inverter unit 40c are switched and controlled. Accordingly, the first inverter unit 40b and the second inverter unit 40c that receive the control signal output the control signal to drive the compressor motor 60 and the outdoor fan motor 70, respectively.

Looking at the operation of the control configuration as described above are as follows.

When power is supplied through the power input code 10 and the user inputs an operation control signal through a key input unit (not shown), the operation control signal is transmitted to the microcontroller 30a. The microcontroller 30a receiving the signal drives the product so that the indoor temperature reaches a desired temperature input by the user.

At this time, AC power is input through the power input code 10 provided in the indoor unit A, and power is input to the converter unit 20a connected to the indoor unit A. This converts AC power to dc power.

The converted dc power is transferred to the inverter unit 20a. The inverter unit 20a includes a plurality of switching driving elements, and the DC power transmitted as described above is converted into three-phase power through the inverter unit 20a. And the converted three-phase power is transferred to the indoor fan motor 50, thereby driving the indoor fan.

In the present invention, the indoor fan motor 50 provided in the indoor unit is applied as a sensorless motor. Then, the microcontroller 30a for outputting the pwm control signal is mounted to control the indoor fan motor 50.

Meanwhile, AC power is applied to the outdoor unit B connected to the power terminal of the indoor unit A, and power is input to the converter unit 20b connected to the outdoor unit B. This converts AC power to dc power. The converted dc power is transferred to the first inverter portion 40b and the second inverter portion 40c. The power transmitted as described above is converted into three-phase power through the first inverter portion 40b and the second inverter portion 40c. The converted three-phase power is transferred to the compressor motor 60 and the outdoor fan motor 70, thereby driving the compressor and the outdoor fan. In this case, the compressor motor 60 and the outdoor fan motor 70 provided in the outdoor unit B use a sensorless motor.

In addition, in order to pwm control the compressor motor 60 and the outdoor fan motor 70 as described above, the microcontroller 30b has two pwm control ports pwm port1 and pwm port2. Outputs the pwm control signal through the two ports and drives the first inverter unit 40b and the second inverter unit 40c to drive the compressor motor 60 and the outdoor fan motor 70 according to the signals. do. As described above, the microcontroller 30b having two ports having the pwm control function, the outdoor fan motor 70 and the compressor motor 60 are applied to a high voltage sensorless motor.

Accordingly, when the user inputs an operation control signal through a key input unit (not shown) provided on the indoor unit A side, the operation control signal is transmitted to the microcontroller 30a of the indoor unit A. The microcontroller 30a controls the indoor fan provided in the indoor unit A to be driven according to the operation control signal, and simultaneously transmits the operation control signal to the outdoor microcontroller 30b connected through the communication circuit. . The microcontroller 30b drives the compressor to supply the refrigerant to the heat exchanger according to an operation control signal, and also drives an outdoor fan to reduce heat generated by the compressor.

At this time, the microcontroller 30a provided on the indoor unit A side determines the rotor position according to the indoor fan motor 50 driving as follows. To operate the sensorless motor, the position signal of the rotor must be present. To this end, sensorless control is performed to detect the position of the rotor from the voltage or current applied to the motor.

That is, the rotor position detection unit 80a mounted between the microcontroller 30a and the indoor fan motor 50 compares the three-phase voltage and the reference voltage output by the counter electromotive force generated by the driving of the indoor fan motor 50. The position of the rotor is detected. When the three-phase voltage reaches the reference voltage, an on signal is output, and when the three-phase voltage does not reach the reference voltage, an off signal is output to the microcontroller 30a.

That is, the three-phase voltage generated by the back electromotive force generated by the driving of the indoor fan motor 50 is output to each of the u, v, and w phases of the inverter unit 40a, and the output signal is provided with the rotor on the v and w phases. The position detection unit 80a detects it. At this time, if the counter electromotive force generated by the drive of the indoor fan motor 50 transmitted to the rotor position detecting unit 80a is higher than the reference voltage, an on signal is output to the microcontroller 30a, and the rotor position sensor 80a. When the counter electromotive force generated by the driving of the indoor fan motor 50 transmitted to 80b is lower than the reference voltage, an off signal is output to the microcontroller 30a. Accordingly, the rotor position detecting ports t1 and t2 of the microcontroller 30a connected to the rotor position detecting unit 80a receive the on / off detection signals as described above to check the driving position of the indoor fan motor 50. Can be controlled at the same time.

For example, the three-phase voltage is output to the rotor position detector 80a through the v and w phases by the counter electromotive force according to the driving of the indoor fan motor 50. At this time, when the rotor position detecting unit 80a determines that the voltage value according to the counter electromotive force transmitted through the three-phase terminal is smaller than the reference voltage value, the rotor position of the microcontroller 30a simultaneously transmits an off signal. It passes to the sense ports (t1, t2). Accordingly, the microcontroller 30a receiving the signal determines that the rotor is located at a position on u by transmitting an off signal on v and w. Then, the pwm control signal is output to the inverter unit 40a so that the rotor rotates to the next phase.

Further, in another embodiment, when the voltage value according to the counter electromotive force transmitted to the rotor position detector 80a in v phase is greater than the reference voltage, the on signal, and the off signal when the reference voltage value is larger than the voltage value according to the counter electromotive force transmitted in w phase, respectively Detect. The signal detected by the rotor position detector 80a is transmitted to the rotor position detection ports t1 and t2 of the microcontroller 30a, and the microcontroller 30a determines that the rotor is positioned on v to determine the position of the motor. Detect. Then, the pwm control signal is output to the inverter unit 40a so that the rotor rotates to the next phase.

On the other hand, the microcontroller 30b provided on the outdoor side also controls the driving phase of the compressor motor 60 and the outdoor fan motor 70 in the same manner as the indoor fan motor 50. The microcontroller 30b includes a rotor position detector 80b between the microcontroller 30b and the compressor motor 60 so as to detect a phase of an AC power input to the compressor. In addition, the microcontroller 30b includes two sensing ports pwm port1 and pwm port2 to receive the phase signal according to the rotor position detected by the rotor position detecting unit 80b.

The rotor position detecting unit 80b detects the position of the rotor by comparing the three-phase voltage for the counter electromotive force generated by the driving of the compressor motor 60 with the reference voltage. That is, the rotor position detector 80b outputs an on signal when the three-phase voltage reaches the reference voltage and an off signal to the microcontroller 30b when the three-phase voltage does not reach the reference voltage.

That is, the rotor position detecting unit 80b detects whether the voltage value of the counter electromotive force transmitted through the v and w phases reaches the reference voltage value as the compressor motor 60 is driven. When the voltage value does not reach the reference voltage value, the rotor position detection unit 80b provided on v and w simultaneously outputs an off signal to the rotor position detection ports s1 and s2 of the microcontroller 30b. . Accordingly, the microcontroller 30b receiving the off signal determines the rotor position of the compressor motor 60, determines that the rotor is positioned on u, and the compressor motor 60 is driven, and thus, the next v phase. Control the rotor to position.

On the other hand, if the back EMF output in the v phase according to the drive of the compressor motor 60 is higher than the reference voltage value, the rotor position detection unit 80b is the ON signal, the back EMF output in the w phase in accordance with the drive of the compressor motor If it is lower than the reference voltage value, the rotor position detection unit 80b detects an off signal. The signals of v and w of the rotor position detection unit 80b sensed as described above are transmitted to the rotor position detection ports s1 and s2 provided in the microcontroller 30b. Accordingly, the microcontroller 30b determines that the position of the phase driven by the compressor is v phase. The microcontroller 30b controls the inverter unit pwm such that the compressor motor rotates so that the position of the rotor is on w.

In addition, the rotor position detection unit 80c is provided between the microcontroller 30 and the outdoor fan motor 70 so that the microcontroller 30b provided at the outdoor side can determine the position of the rotor of the outdoor fan motor 70. do. The rotor position detecting unit 80c detects the position of the rotor according to the rotation of the motor and transmits the position signal of the rotor to the microcontroller 30b, whereby the microcontroller 30b determines the driving position of the outdoor fan motor 70. can do.

That is, according to the driving of the outdoor fan motor 70, the voltage value according to the counter electromotive force transmitted through the v and w phases is transmitted to the rotor position detecting unit 80c, and the rotor position detecting unit 80c transmits the three-phase voltage value. It is detected whether or not the reference voltage value is reached. When the voltage value does not reach the reference voltage value, the rotor position detector 80c provided on v and w simultaneously outputs an off signal to the rotor position detection ports s3 and s4 of the microcontroller 30b. . Accordingly, the microcontroller 30b receiving the off signal determines the rotor position of the outdoor fan motor 70, determines that the rotor is driven on u, and the outdoor fan motor 70 is driven. Control the rotor to be positioned on it.

On the other hand, when the counter electromotive force output in the v phase of the rotor position detection unit 80c according to the driving of the outdoor fan motor 70 is higher than the reference voltage value, the rotor position detection unit 80c is turned on (on), the outdoor fan motor 70 When the counter electromotive force output in the w phase is lower than the reference voltage value according to the driving of), the rotor position detecting unit 80c detects the off signal. The signals of v and w of the rotor position detection unit 80c sensed as described above are transmitted to the rotor position detection ports s3 and s4 provided in the microcontroller 30b. Accordingly, the microcontroller 30b determines that the position of the phase driven by the outdoor fan motor 70 is v-phase. In addition, the microcontroller 30b drives the outdoor fan motor 70 to control the inverter unit pwm such that the rotor position is located on w.

As described above, the present invention uses a sensorless motor in an indoor unit and an outdoor unit, and includes a separate rotor position detector to detect the rotor position of the sensorless motor, and transmits the detected rotor position signal to the microcontroller. It is a basic technical idea that the controller drives the motor by controlling the pwm.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

Therefore, the inverter control configuration of the separate inverter air conditioner according to the present invention can expect the following effects.

If the indoor and outdoor fan motors and compressor motors are applied with a high voltage sensorless motor and a microcontroller having a pwm function is designed, it is possible to eliminate driving circuits and sensors mounted in the motor.

In indoor and outdoor air, high voltage sensorless motors are applied to microcontrollers, indoor / outdoor fan motors, and compressor motors with ports that output pwm control signals, thereby reducing costs and simplifying motor design.

Claims (2)

In the separate inverter air conditioner composed of the indoor unit and the outdoor unit, The indoor unit, A converter unit converting the DC power as the AC power is input; An inverter unit which receives the DC power from the converter unit and converts the power into three-phase power; An indoor fan motor driven by driving a three-phase power source of the inverter unit; A rotor position detector for outputting a square wave signal by comparing the counter electromotive force generated by the indoor fan motor with a reference signal; And a microcontroller configured to receive a signal detected through the rotor position detection unit and output a PWM control signal for controlling the rotor speed of the indoor fan motor to the inverter unit. In the separate inverter air conditioner composed of the indoor unit and the outdoor unit, The outdoor unit, A converter unit converting the DC power as the AC power is input; First and second inverter units which receive DC power from the converter unit and convert the DC power into three-phase power; An outdoor fan motor to which the three-phase power of the first inverter unit is transmitted and driven; A compressor motor in which the three-phase power of the second inverter unit is transmitted and driven; A first rotor position detector for outputting a square wave signal by comparing the counter electromotive force generated by the outdoor fan motor with a reference signal; A second rotor position detector for outputting a square wave signal by comparing the counter electromotive force generated by driving the compressor motor with a reference signal; Inverter of the separate inverter air conditioner comprising a micro-controller receiving the signal detected through the first and second rotor position detection unit, and outputs a PWM control signal for controlling the rotor speed of the indoor fan motor to the inverter unit. Device.