KR101892006B1 - Apparatus and method for controlling compressor - Google Patents

Abstract

A compressor control device and a compressor control method are disclosed. According to the present invention, the compressor control apparatus and the compressor control method according to the present invention detect the input voltage of the commercial power supply, the motor voltage of the compressor motor, and the motor current of the compressor motor, Value and the voltage value of the triac can be calculated. Accordingly, additional OPAMPs or separate sensors for measuring the capacitor voltage are unnecessary, thereby reducing the cost.

Description

[0001] APPARATUS AND METHOD FOR CONTROLLING COMPRESSOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor control device and a compressor control method, and more particularly, to a compressor control device and a compressor control method that can calculate a voltage of a capacitor and a triac connected to a compressor motor without using a sensor.

In general, a compressor is a device for converting mechanical energy into compressive energy of a compressible fluid and is used as a part of a refrigeration apparatus, such as a refrigerator or an air conditioner.

Compressors are largely divided into Reciprocating Compressors, Rotary Compressors, and Scroll Compressors. In the reciprocating compressor, a compression space in which an operating gas is sucked or discharged is formed between a piston and a cylinder, so that the piston linearly reciprocates within the cylinder and compresses the refrigerant. The rotary compressor compresses the refrigerant while eccentrically rotating the roller along the inner wall of the cylinder so that a compression space in which the working gas is sucked or discharged is formed between the roller and the cylinder. In the scroll type compressor, a compression space is formed between an orbiting scroll and a fixed scroll to suck or discharge an operating gas, thereby compressing the refrigerant while the newbear scroll is rotated along the fixed scroll.

Generally, a reciprocating compressor is a reciprocating compressor that sucks and compresses refrigerant gas while linearly reciprocating the piston inside the cylinder. The reciprocating compressor reciprocates and reciprocates according to the method of driving the piston, Compressors.

The reciprocating compressor is a reciprocating compressor that connects a crankshaft to a rotary motor and a piston to the crankshaft so as to convert the rotational force of the rotary motor into a linear reciprocating motion. The linear compressor is a reciprocating compressor, And the reciprocating compressor which reciprocates the piston by linear motion of the motor by directly connecting the piston to the piston.

On the other hand, as described above, since there is no crankshaft for converting rotational motion into linear motion, the linear compressor is superior in performance to a general compressor in terms of compression efficiency because there is little friction loss. Such a linear compressor is used in a refrigerator, an air conditioner, etc., and controls a freezing capacity by varying the voltage applied to the compressor.

Such a linear compressor constitutes a compressor control device by connecting an AC capacitor in series in order to improve utilization rate of an applied voltage. Further, such a compressor control apparatus generally detects the motor voltage and the motor current of the compressor motor to calculate the stroke, thereby controlling the compressor. However, the compressor control device must be able to continuously or periodically sense the voltage value of the capacitor and the triac connected to the compressor, for example, to protect the compressor from overload during compressor control. However, there is a disadvantage in that the cost is increased when a new OPAMP is added for this purpose.

Therefore, the embodiments of the present invention can detect the capacitor voltage and the triad voltage required for protection of the compressor in an abnormal state, for example, in an overload state at the time of compressor control, without detecting a separate sensor, A compressor control device and a compressor control method that can be calculated by using a motor voltage of a compressor motor, a motor voltage of a compressor motor, and a motor current of a compressor motor.

A compressor control apparatus according to an embodiment of the present invention includes: at least one capacitor connected to a compressor motor; A triac driving the compressor motor according to a gate drive signal; And a microcomputer for generating the gate driving signal and calculating a voltage value of the capacitor and the triac using an input voltage of a commercial power supply, a motor voltage of the compressor motor, and motor current values of the compressor motor.

In an embodiment, the microcomputer includes a capacitor voltage calculator for calculating a voltage value of the capacitor, and the capacitor voltage calculator calculates a constant capacitor voltage value when the motor current value is zero.

In one embodiment, the microcomputer includes a capacitor voltage calculator for calculating a voltage value of the capacitor, and the capacitor voltage calculator calculates a value obtained by subtracting the motor voltage from the input voltage if the motor current value is not 0, And the voltage value of the capacitor is calculated.

In an embodiment, the microcomputer includes a triac voltage calculating unit for calculating a triac voltage value using the input voltage, the motor voltage, and the capacitor voltage value.

In an embodiment, the tricky voltage calculator calculates the trick voltage value by subtracting the motor voltage from the input voltage and subtracting the capacitor voltage value from the input voltage.

In an embodiment, the compressor control device includes an input voltage detecting unit for detecting an input voltage of the commercial power supply; A motor voltage detector for detecting a motor voltage applied to the compressor motor; And a motor current detector for detecting a motor current flowing in the compressor motor.

In an embodiment, the apparatus further includes a zero voltage detector for detecting a zero voltage from the detected input voltage.

In an embodiment, the commercial power supply for supplying power to the compressor motor; And a rectifying unit for rectifying and smoothing the commercial power supply.

In an embodiment, it is characterized in that it further comprises a switching unit connected to the triac, operable to connect the triac to the compressor motor in accordance with a control signal, or to connect the commercial power directly to the compressor motor.

In the embodiment, the microcomputer generates the control signal for controlling the operation of the switching unit and provides the control signal to the switching unit.

Further, a method of controlling a compressor according to an embodiment of the present invention includes: detecting input voltage of a commercial power supply, a motor voltage of a compressor motor, and a motor current of the compressor motor; Calculating a voltage of a capacitor connected to the compressor motor using the input voltage, the motor voltage, and the motor current; Calculating a voltage of a triac operating the compressor motor in accordance with the gate drive signal using the calculated capacitor voltage, calculating a voltage of the calculated input voltage, a motor voltage, and a motor current, a voltage of the calculated capacitor, And controlling the driving of the compressor using the voltage of the malfunction.

In the embodiment, the step of calculating the voltage of the capacitor is a step of calculating a constant voltage value when the motor current value is zero.

In the embodiment, the step of calculating the voltage of the capacitor is a step of calculating a value obtained by subtracting the motor voltage from the input voltage if the motor current value is not zero.

In the embodiment, the step of calculating the voltage of the triac is a step of calculating the voltage of the triac by subtracting the motor voltage from the input voltage and subtracting the calculated voltage of the capacitor from the input voltage .

In an embodiment, the method further includes monitoring the motor voltage, the capacitor voltage, and the triac voltage value to detect an abnormality of the compressor.

Accordingly, in the compressor control apparatus and the compressor control method according to the embodiment of the present invention, the detection of the capacitor voltage and the triad voltage necessary for protecting the compressor in a state such as an overload, for example, By using the motor voltage of the compressor motor and the motor current of the compressor motor, the calculation is easy, and additional OPAMP or a separate sensor for measuring the capacitor voltage is unnecessary, thereby reducing the cost.

1 is a graph showing a capacitor voltage calculation value of a capacitor of a compressor control apparatus according to an embodiment of the present invention;
FIG. 2 is a graph showing a triad voltage calculation value of a triac of a compressor control apparatus according to an embodiment of the present invention; FIG.
3 is an exemplary configuration diagram of a compressor control apparatus according to an embodiment of the present invention;
4 is an exemplary flow diagram of a compressor control method in accordance with an embodiment of the present invention;
5 is a cross-sectional view of a reciprocating compressor included in a compressor control apparatus according to embodiments of the present invention;
FIG. 6 is a perspective view of a refrigerator to which the reciprocating compressor of FIG. 5 is applied.

Hereinafter, a compressor control apparatus and a compressor control method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The compressor control apparatus according to an embodiment of the present invention includes at least one capacitor connected to a compressor motor, and a triac that operates the compressor motor according to a gate drive signal, generates the gate drive signal, And a microcomputer for calculating a voltage value of the capacitor and the triac using a voltage, a motor voltage of the compressor motor, and a motor current value of the compressor motor.

First, the reciprocating compressor applied to the embodiments of the present invention will be described in detail with reference to FIG. The reciprocating compressor includes a casing 800 in which a gas suction pipe SP and a gas discharge pipe DP are communicated with each other, a frame unit 200 which is resiliently supported inside the casing 800, And a piston 420 is coupled to a mover 330 of the motor 300 so as to be supported by the frame unit 200. The motor 300 includes a motor 300, A plurality of resonance units 500 for inducing a resonance movement by elastically supporting the piston 420 of the compression unit 400 in the direction of motion, .

The frame unit 200 includes a first frame 210 supporting the compression unit 400 and supporting the front side of the motor 300 and a second frame 210 coupled to the first frame 210, And a third frame 230 coupled to the second frame 220 to support a plurality of second resonance springs 530. The second frame 220 supports the rear side of the second frame 220, The first frame 210, the second frame 220, and the third frame 230 may be formed of a non-magnetic material such as aluminum to reduce iron loss.

The first frame 210 is formed with a frame 211 in the shape of an annular plate and a cylindrical cylinder part 212 is formed at the center of the frame part 211 so as to insert the cylinder 410, That is, long in the motor direction. The frame portion 211 is formed to have an outer diameter larger than that of the outer stator 310 of the motor 300 so that the frame portion 211 can support both the outer stator 310 and the inner stator 320 of the motor 300. [ It is preferable to be formed at least not smaller than the inner diameter.

The first frame 210 has the inner stator 320 inserted and fixed to the outer circumferential surface of the cylinder 212. In this case, it is preferable that the first frame 210 is formed of a non-magnetic material such as aluminum to prevent magnetic loss. The cylinder part 212 may be formed integrally with the cylinder 410 by using an insert die casting method. However, the cylinder portion 212 may be screwed into the inner circumferential surface of the cylinder 410 by press-fitting the cylinder 410 or forming a screw thread. The cylinder portion 212 has a stepped surface or an inclined surface formed between a front side inner circumferential surface and a rear side inner circumferential surface so that the cylinder 410 coupled to the inner circumferential surface of the cylinder portion 212 can be supported in the piston direction May be preferable in terms of stability of the cylinder 410. [

The motor 300 includes an outer stator 310 supported between the first frame 210 and the second frame 220 and having a coil 311 wound thereon, And a magnet 331 is provided to correspond to the coil 311 of the outer stator 310 so that the outer stator 310 and the inner stator 310 are coupled to each other, And a mover (330) reciprocating in a straight line along the direction of the magnetic flux. The outer stator 310 and the inner stator 320 are formed by stacking a plurality of thin stator cores one by one in a cylindrical shape or by stacking a plurality of thin stator cores in a block shape and radially stacking the stator blocks.

The compression unit 400 includes a cylinder 410 integrally formed with the first frame 210 and a compression chamber P coupled to the mover 330 of the motor 300, A suction valve 430 installed at a front end of the piston 420 to adjust the suction of the refrigerant gas while opening and closing the suction passage 421 of the piston 420, A discharge valve 440 mounted on the discharge side of the cylinder 410 for regulating the discharge of compressed gas while opening and closing the compression space P of the cylinder 410 and a discharge valve 440 for elastically supporting the discharge valve 440, And a discharge cover 460 fixed to the first frame 210 at a discharge side of the cylinder 410 to receive the discharge valve 440 and the valve spring 450.

The cylinder 410 is formed in a cylindrical shape and inserted into the cylinder portion 212 of the first frame 210.

As the inner circumferential surface of the cylinder 410 forms the bearing surface with the piston 420 made of cast iron, the casting iron or at least the first frame 210, more precisely the cylinder portion 212). ≪ / RTI >

The piston 420 may be made of the same material as that of the cylinder 410, or may be made of a material having a hardness at least similar to that of the cylinder 410, thereby reducing wear on the cylinder 410. A suction passage 421 is formed in the piston 420 so that the refrigerant is sucked into the compression chamber P of the cylinder 410.

The resonance unit 500 includes a spring supporter 510 coupled to a connection portion between the mover 330 and the piston 420 and first resonance springs 520 supported on the front side of the spring supporter 510. [ And second resonance springs 530 supported on the rear side of the spring supporter 510. [

In the drawing, reference numerals 422 and 423 denote a piston connecting portion and an oil feeder, respectively.

When power is applied to the motor 300 and a magnetic flux is formed between the outer stator 310 and the inner stator 320 and the magnetic force is generated between the outer stator 310 and the inner stator 320, 330 continuously move reciprocally by the resonance unit 500 while moving along the direction of the magnetic flux. When the piston 420 moves backward in the cylinder 410, the refrigerant filled in the inner space of the casing 800 flows into the suction passage 421 of the piston 420 and the suction valve 430 And is sucked into the compression space P of the cylinder 410. When the piston 420 advances in the cylinder 410, the refrigerant gas sucked into the compression space P is compressed, and the discharge valve 440 is opened to discharge the refrigerant gas repeatedly do.

The reciprocating compressor according to the embodiments of the present invention includes a compressor control device as described below. In addition, the reciprocating compressor can be widely used in refrigeration equipment such as a refrigerator or an air conditioner. For example, referring to FIG. 6, a refrigerating machine 700 having a refrigerant compression refrigeration cycle including a compressor, a condenser, an inflator, and an evaporator includes a main substrate 710 for controlling the overall operation of the refrigerating machine And the reciprocating compressor (C) is connected. The compressor control device may be provided on the main board 710.

Hereinafter, the configuration of the compressor control apparatus according to the embodiment of the present invention including the reciprocating compressor 30 described above with reference to FIG. 3 will be described in detail. The compressor control apparatus 100 includes a commercial power supply 10, a triac 20, a compressor 30, an AC capacitor 40, and a microcomputer 90 as shown in the figure. The compressor control apparatus 100 further includes an input voltage detecting unit 50, a motor voltage detecting unit 60, a zero voltage detecting unit 70, and a motor current detecting unit 80. Such a configuration may be changed as needed.

The commercial power supply (10) supplies power to the compressor (30). The compressor (30), which is supplied with power from the commercial power supply (10), performs a reciprocating motion of the piston. Here, the commercial power source 10 may be a 220 V AC power source generally used in the home.

The triac 20 drives the motor of the compressor 30 according to a gate driving signal. More specifically, the triac 20 is connected in series to the compressor 30, and operates the compressor 30 according to a gate driving signal received from the microcomputer 90. In an embodiment, the triac 30 may further include a switching unit, that is, a triac protection relay (not shown), for protecting the triac 30 in preparation for a malfunction due to driving errors.

The capacitor 40 may be connected to the motor of the compressor 30 and may have a capacitance corresponding to the inductance of the coil wound on the motor of the compressor 30. Here, the capacitor 40 uses an AC capacitor (AC capacitor), but the present invention is not limited thereto.

The microcomputer 90 calculates the voltage value of the capacitor 40 and the triac 20 using the input voltage of the commercial power supply 10, the motor voltage of the compressor 30 motor, do. The microcomputer 90 generates a gate driving signal for controlling conduction of the triac 20.

The microcomputer 90 includes a capacitor voltage calculating unit 92 for calculating a voltage value of the capacitor 40 and a triac voltage calculating unit 94 for calculating a voltage value of the triac 20 . Therefore, the compressor control apparatus according to the present invention does not need to have a separate sensor or additional operational amplifier (OPAMP) to detect the voltage of the capacitor 40 and the voltage of the triac 20.

First, the relation between the input voltage, the motor voltage, the capacitor voltage, and the triad voltage is expressed by the following equation (1) from a general motor equation.

Where V _in is the input voltage of the commercial power supply, V _m is the motor voltage, V _cap is the voltage of the capacitor, and V _triac is the voltage of the _triac . I represents the motor current flowing through the compressor motor, R represents the internal resistance of the compressor, L represents the inductance of the motor coil, K represents the motor constant, and C represents the capacitance forming the resonance circuit with L.

The capacitor voltage calculation unit 92 calculates a constant value as a capacitor voltage value when the motor current value flowing through the compressor motor is zero. That is, there is no change in the capacitor voltage value in the section where the motor current value is 0 in the motor current waveform. If the motor current value flowing through the compressor motor is not 0, the capacitor voltage calculating section 92 calculates a value obtained by subtracting the motor voltage from the input voltage as the capacitor voltage value.

In this regard, a graph of capacitor voltage values calculated by the capacitor voltage calculator 92 is shown in FIG. As shown in Fig. 1, waveforms of input voltage, motor voltage, and motor current detected through one or more sensors are respectively shown. And the capacitor voltage values are derived using the detected input voltage, motor voltage, and motor current values. Here, the capacitor voltage value can be derived from Equation (1) as follows.

At this time, if the current flowing through the motor of the compressor 30 is not 0, the voltage of the triac becomes '0', and the following equation (2) can be derived.

If the current flowing through the motor of the compressor 30 is zero, the following equation (3) can be derived using the fact that there is no change in the voltage of the capacitor.

1, the current value flowing through the motor of the compressor 30 in the first region shown in FIG. 1 is not zero, so that the capacitor voltage value is calculated by Equation (2). That is, at this time, the value obtained by subtracting the voltage value applied to the motor of the compressor 30 from the input voltage value of the commercial power supply 10 is calculated as the capacitor voltage value.

In addition, since the current flowing through the motor of the compressor 30 in the second region shown in FIG. 1 is zero, the capacitor voltage value is calculated by Equation (3). That is, in this interval, there is no change in the capacitor voltage value and a constant value is calculated as the capacitor voltage value. Here, when the current flowing through the motor of the compressor 30 becomes zero, the predetermined region may be formed or may be represented by a specific vertex. In either case, the capacitor voltage value is calculated by Equation (3). For example, if the motor current value is 0 in a predetermined region, the capacitor voltage value at that peak is maintained at a constant value and the motor current value becomes 0, It has the same value as the previous capacitor voltage value.

The triac voltage calculator 94 calculates the triac voltage value using the input voltage, the motor voltage, and the capacitor voltage value calculated by the capacitor voltage calculator 92. The triac voltage calculating unit 94 subtracts the motor voltage from the input voltage and subtracts the capacitor voltage value from the input voltage to calculate the triac voltage value. That is, the triac voltage value is calculated by the following equation (4) derived from the equation (1).

In this regard, a graph consisting of the triad voltage values calculated by the triad voltage calculator 94 is shown in FIG. 2, the input voltage and motor voltage detected through one or more sensors and the waveform of the capacitor voltage calculated by the capacitor voltage calculator 92 are shown, respectively. And the triac voltage values are calculated using the detected input voltage, the motor voltage, and the calculated capacitor voltage values. As shown in the figure, the triac voltage value becomes 0 in a region corresponding to the first region shown in FIG. 1, that is, in a period in which the current flowing through the motor of the compressor 30 is not zero. On the other hand, in the section in which the current flowing through the motor of the compressor 30 is zero, the triac voltage value is calculated by the above-mentioned expression (4).

The microcomputer 90 generates a gate driving signal of the triac 20 and transmits the generated signal to control the stroke of the compressor 30.

The input voltage detector 50 detects the input voltage of the commercial power supply 10. Further, the input voltage detecting unit 50 confirms a voltage variation.

The motor voltage detector 60 detects a motor voltage applied to the compressor 30 motor. The motor current detection unit 80 detects a motor current flowing in the motor of the compressor 30. Here, a stroke value for controlling the compressor 30 is calculated from the motor voltage detected by the motor voltage detector 60 and the motor current detected by the motor current detector 80. The motor current detector 80 may be, for example, a current transformer (CT).

The zero voltage detector 70 detects a zero voltage from the input voltage detected by the input voltage detector 50. The zero voltage detector 70 confirms a variation in frequency.

The compressor control apparatus 100 may further include a controller 30 connected to the triac 20 and connecting the triac 20 to a motor of the compressor 30 in accordance with a control signal, The compressor 30 may further include a switching unit (not shown) that operates to directly connect to the motor. The switching unit (not shown) may be a protection relay for protecting the triac 20.

Furthermore, the compressor control apparatus 100 may further include a rectifying unit (not shown) for rectifying and / or smoothing the commercial power supply 10 that supplies power to the compressor motor 30.

In this way, according to the compressor control apparatus and the compressor control method according to the embodiment of the present invention, the compressor control apparatus according to the embodiment of the present invention can use a separate voltage sensor for detecting the capacitor voltage and the triac voltage It is easy to calculate by using the input voltage value of the commercial power source, the motor voltage value of the compressor motor, and the motor current value of the compressor motor without using the additional OPAMP or a separate sensor.

Hereinafter, a compressor control method according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

Generally, in a reciprocating compressor, a piston is moved up and down by an applied voltage according to a stroke command value set by a user, and the stroke is thereby varied to control the cooling power. In accordance with the switching control signal transmitted from the microcomputer 90, the triac 20 increases the turn-on period of the gate drive to increase the stroke, or shortens the turn-on period of the gate drive to reduce the stroke.

According to the compressor control method according to the embodiment of the present invention, the input voltage of the commercial power supply, the motor voltage of the compressor motor, and the motor current of the compressor motor are detected using, for example, a sensor or an OPAMP (S10) . Specifically, the voltage and current applied to the motor of the reciprocating compressor (30) are detected by the motor voltage detector (60) and the motor current detector (80), respectively, and applied to the microcomputer (90).

Next, the capacitor voltage of the capacitor connected to the compressor motor is calculated using the detected input voltage, motor voltage, and motor current values (S20). Here, if the detected motor current value is 0, the capacitor voltage is calculated as a constant voltage value. That is, there is no change in the capacitor voltage value while the detected motor current value is zero. On the other hand, if the detected motor current value is not 0, the capacitor voltage subtracts the corresponding motor voltage value from the detected input voltage value to calculate the voltage value of the capacitor. That is, while the detected motor current value is not 0, the capacitor voltage value is calculated from the difference between the input voltage and the motor voltage value. Then, using the calculated capacitor voltage values, a triac voltage value of the triac driving the compressor motor according to the gate driving signal is calculated (S30).

The microcomputer 90 calculates the stroke of the compressor 30 using the voltage and current detected from the motor voltage detector 60 and the motor current detector 80. Then, the calculated stroke is compared with a predetermined stroke command value, and a switching control signal for switching the triac 20 based on the comparison result is output.

At this time, if the stroke is smaller than the stroke command value, the microcomputer 90 outputs a switching control signal for lengthening the on period of the triac 20 to increase the voltage applied to the motor of the compressor 30 . That is, when the calculated stroke is smaller than the stroke command value, the voltage value of the calculated triac is changed in order to increase the firing angle of the switching control signal. On the other hand, if the calculated stroke is larger than the stroke command value, the voltage value of the calculated triac is changed to reduce the firing angle of the switching control signal.

In other words, the motor voltage and the motor current are used to calculate the stroke, and the calculated stroke is compared with the stroke command value to change the voltage value of the calculated triac by increasing or decreasing the threshold angle of the triac. That is, the triac is turned on at the conduction time of the determined triac to generate the motor voltage corresponding to the desired stroke. Also, the triac is turned off after maintaining the on state for a predetermined period of conduction time interval (Interval).

The concrete calculation of the voltage value of the triac for compressor control may be performed by subtracting the motor voltage from the input voltage and subtracting the capacitor voltage value calculated in step S20 from the value. As described above, according to the compressor control method according to the embodiment of the present invention, it is possible to detect the capacitor voltage value and the triac voltage value required at the compressor control without requiring a separate sensor, Voltage, and the motor current of the compressor motor.

Also, in one embodiment of the present invention, the motor voltage, the voltage value of the calculated capacitor, and the voltage value of the triac are monitored at predetermined time intervals, and it is possible to detect whether the compressor drive is abnormal. When an abnormality is detected in the input voltage of the commercial power supply applied to the compressor motor during monitoring the detected or calculated voltage values, correspondingly, at least one of the motor voltage, the capacitor voltage, and the triad voltage value .

As described above, according to the compressor control device and the compressor control method according to the embodiments of the present invention, it is possible to detect the capacitor voltage and the triac voltage, which are necessary for protecting the capacitor and the triac, The input voltage of the compressor motor, the motor voltage of the compressor motor, and the motor current of the compressor motor. Accordingly, it is easy to calculate the voltage value of the capacitor and the triac provided, and an OPAMP or a separate sensor is unnecessary, thereby reducing the manufacturing cost.

10 - Commercial Power 20 - Triac
30 - compressor 40 - AC capacitor
50 - Input voltage detector 60 - Motor voltage detector
70 - Zero voltage detector 80 - Motor current detector
90 - Microcomputer 92 - Capacitor voltage calculating section
94 - triac voltage calculator

Claims (15)

One or more capacitors coupled to the compressor motor;
A triac driving the compressor motor according to a gate driving signal; And
And a microcomputer for generating the gate driving signal and calculating the voltage value of the capacitor and the triac using the input voltage of the commercial power supply, the motor voltage of the compressor motor, and the motor current values of the compressor motor,
The microcomputer includes:
If the motor current value of the compressor motor is not 0, a value of the motor voltage of the compressor motor corresponding to the value of the input voltage is subtracted from the value of the motor voltage of the compressor motor, The capacitor voltage value at that peak is determined to be a constant value, and if the case where the motor current value becomes 0 is a specific peak, the capacitor voltage value at the peak is calculated to have the same value as the immediately preceding capacitor voltage value,
Wherein the voltage value of the triac is calculated using the input voltage, the motor voltage of the compressor motor, and the capacitor voltage value. The method according to claim 1,
The microcomputer includes:
And a capacitor voltage calculation unit for calculating a voltage value of the capacitor, wherein the capacitor voltage calculation unit calculates a constant capacitor voltage value when the motor current value is zero. The method according to claim 1,
The microcomputer includes:
And a capacitor voltage calculation unit for calculating a voltage value of the capacitor. The capacitor voltage calculation unit calculates a value obtained by subtracting the motor voltage from the input voltage as a voltage value of the capacitor if the motor current value is not 0 To the compressor control device. The method according to claim 2 or 3,
The microcomputer includes:
And a triac voltage calculating unit for calculating a triac voltage value using the input voltage, the motor voltage, and the capacitor voltage value. 5. The method of claim 4,
Wherein the triac voltage calculating unit comprises:
Subtracts the motor voltage from the input voltage and subtracts the capacitor voltage value from the input voltage to calculate the triac voltage value. The method according to claim 1,
An input voltage detector for detecting an input voltage of the commercial power supply;
A motor voltage detector for detecting a motor voltage applied to the compressor motor; And
Further comprising: a motor current detection unit for detecting a motor current flowing in the compressor motor. The method according to claim 6,
And a zero voltage detecting unit for detecting a zero voltage from the detected input voltage. The method according to claim 1,
The commercial power source supplying power to the compressor motor; And
Further comprising a rectifying section for rectifying and smoothing the commercial power supply. The method according to claim 1,
And a switching unit, coupled to the triac, operable to connect the triac to the compressor motor in accordance with a control signal or to connect the commercial power directly to the compressor motor, . 10. The method of claim 9,
The microcomputer includes:
Wherein the control unit generates the control signal for controlling operation of the switching unit and provides the control signal to the switching unit. Detecting an input voltage of a commercial power supply, a motor voltage of a compressor motor, and a motor current of the compressor motor;
Calculating a voltage of a capacitor connected to the compressor motor using the input voltage, the motor voltage, and the motor current;
Calculating a voltage of a triac operating the compressor motor according to the gate drive signal using the calculated capacitor voltage; And
Controlling the driving of the compressor using the detected input voltage, the motor voltage, and the motor current, the voltage of the calculated capacitor, and the voltage of the triac,
The step of calculating the voltage of the capacitor
If the motor current value of the compressor motor is not 0, a value of the motor voltage of the compressor motor corresponding to the value of the input voltage is subtracted from the value of the motor voltage of the compressor motor, The capacitor voltage value in the period is determined as a constant value, and if the case where the motor current value is 0 is a specific vertex, the capacitor voltage value at the peak is calculated to have the same value as the immediately preceding capacitor voltage value,
Wherein the step of calculating the voltage value of the triac is calculated using the input voltage, the motor voltage of the compressor motor, and the capacitor voltage value. delete delete 12. The method of claim 11,
Wherein the step of calculating the voltage of the triac comprises:
And subtracting the motor voltage from the input voltage and subtracting the voltage of the capacitor from the calculated value to calculate the voltage of the triac. 12. The method of claim 11,
Further comprising the step of monitoring an abnormality of the compressor by monitoring the motor voltage, the capacitor voltage, and the triac voltage value.

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