JP6210167B2 - Dehumidifier control device - Google Patents

Description

  The present invention relates to a control device for a dehumidifier.

  The dehumidifier control device includes a rectifier circuit, a smoothing capacitor, a compressor drive unit, and a control unit. In the control device, the rectifier circuit rectifies the AC voltage. The smoothing capacitor smoothes the rectified voltage. The compressor driving unit converts the smoothed voltage into an AC voltage and drives the compressor. The control unit is supplied with a control power supply voltage generated from the smoothed voltage. The control unit controls driving of the compressor.

  The smoothing capacitor accumulates charging charges during the supply of the AC voltage from the power source. The charged charge remains as a residual charge even when the supply of the AC voltage from the power source is cut off. The control unit maintains the operating state during a period (for example, 1 minute) until the residual power is discharged and the control power supply voltage decreases. For this reason, when the AC voltage is supplied again after the supply of the AC voltage is cut off, the control unit is not reset. In this case, the control unit continues to recognize the operation setting state or the abnormality occurrence state before the supply of the AC voltage is interrupted.

  On the other hand, Patent Document 1 discloses a technique for rapidly discharging residual charges of a smoothing capacitor. According to this technique, a voltage that does not allow the compressor to operate is supplied to the compressor. As a result, the residual charge of the smoothing capacitor can be discharged without rotating the compressor motor.

Japanese Unexamined Patent Publication No. 2012-239289

  However, in the thing of patent document 1, when discharging a residual charge, it is necessary to make the motor of a compressor into a restraint state. For this reason, a new control program is required to maintain energization of the compressor motor without causing any abnormality.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide a control device for a dehumidifier that can discharge a residual charge of a smoothing capacitor by a simple change in a control program for a compressor.

The controller of the dehumidifier according to the present invention includes a rectifier circuit that rectifies an AC voltage, a smoothing capacitor that smoothes the voltage rectified by the rectifier circuit to obtain a DC bus voltage, and a DC that is smoothed by the smoothing capacitor. A compressor drive unit that converts a bus voltage into an AC voltage to drive a compressor used for air dehumidification, a detection unit that detects a supply state of an AC voltage to the rectifier circuit, air is sucked and dehumidified A blower drive unit that drives a blower that exhales air, and a control unit that starts the operation of the compressor when the detection unit detects the interruption of the supply of AC voltage to the rectifier circuit, and the control When the detection unit detects the interruption of the supply of the AC voltage to the rectifier circuit, the compressor adjusts the rotor of the compressor motor to the initial position via the compressor drive unit, and then compresses the compressor. After controlling the rotation of the motor and adjusting the rotor of the compressor motor to the initial position in a state where the blower driving unit is operated before the compressor is stopped when the stop command is received, The operation of the blower is stopped .

  According to this invention, the compressor starts the operation when the detection unit detects the interruption of the supply of the AC voltage to the rectifier circuit. As a result, the residual charge of the smoothing capacitor is discharged. For this reason, the residual charge of the smoothing capacitor can be discharged by a simple change in the control program of the compressor.

It is a longitudinal cross-sectional view of the dehumidifier using the dehumidifier control apparatus in Embodiment 1 of this invention. It is a circuit diagram of the control apparatus of the dehumidifier in Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the control apparatus of the dehumidifier in Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the control apparatus of the dehumidifier in Embodiment 2 of this invention.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the part which is the same or it corresponds in each figure. The overlapping description of the part is appropriately simplified or omitted.

Embodiment 1 FIG.
1 is a longitudinal sectional view of a dehumidifier in which a dehumidifier control apparatus according to Embodiment 1 of the present invention is used.

  The left side of FIG. 1 is the front of the dehumidifier. The housing of the dehumidifier includes a central housing 1, a front housing 2, and a rear housing 3. The central housing 1 is provided at the center of the dehumidifier in the front-rear direction of the dehumidifier. The central housing 1 is provided so as to be independent. The front housing 2 is detachably provided at the front portion of the central housing 1. The rear housing 3 is detachably provided at the rear portion of the central housing 1.

  The discharge port 4 is formed in the upper part of the central housing 1. The blower 5 is provided at the center of the central housing 1 in the front-rear direction of the central housing 1. For example, the blower 5 includes a blower fan and a motor. The rotation axis of the blower 5 is set so as to be horizontally oriented in the front-rear direction of the dehumidifier at the central portion of the central housing 1. The dehumidifying device 6 is provided at the rear part of the central housing 1. The dehumidifier 6 includes a compressor 6a, a condenser 6b, a decompressor 6c, and an evaporator 6d. A humidity detection device (not shown) is provided on one side of the lower portion of the central housing 1.

  The front housing 2 includes an operating device 7 and a water storage tank 8. The operating device 7 is provided on the upper part of the front housing 2. The operation device 7 includes an operation unit and a display unit (not shown). The water storage tank 8 is detachably provided from the front of the front housing 2 to the lower portion of the front housing 2.

  The rear housing 3 includes a suction port 9. The suction port 9 is provided in the upper part of the rear housing 3.

  In the dehumidifier, the control device 10 is provided at the front of the central housing 1. The control device 10 controls the operation of the blower 5 based on the operation state of the operation unit of the operation device 7 and the humidity detected by the humidity detection device. The motor of the blower 5 rotates at the number of rotations according to the control by the control device 10. As a result, the indoor air A is sucked into the housing in the horizontal direction from the suction port 9. Thereafter, the air A passes through the evaporator 6d. Thereafter, the blower 5 discharges the air B into the room from the discharge port 4 upward.

  The control device 10 controls the operation of the compressor 6a based on the operation state of the operation unit of the operation device 7 and the humidity detected by the humidity detection device. The compressor 6 a compresses the refrigerant at a frequency corresponding to the control by the control device 10. The condenser 6b cools the refrigerant compressed by the compressor 6a. The decompression device 6c decompresses the refrigerant cooled by the condenser 6b. The evaporator 6d removes moisture contained in the air A by performing heat absorption on the refrigerant decompressed by the decompression device 6c. As a result, dehumidified air B is generated. The water removed from the air A is stored in the water storage tank 8.

Next, the control device 10 will be described with reference to FIG.
FIG. 2 is a circuit diagram of the dehumidifier control apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the control device 10 includes a converter circuit 11, a compressor drive unit 12, a blower drive unit 13, a switching transformer (DCDC converter) 14, a detection unit 15, and a control unit 16.

  For example, the converter circuit 11 includes a reactor 11a, a rectifier circuit 11b, and a smoothing capacitor 11c. The input side of the reactor 11 a is connected to one of the output sides of the plug 17. For example, the rectifier circuit 11b includes a diode bridge. One of the input sides of the rectifier circuit 11b is connected to the output side of the reactor 11a. The other input side of the rectifier circuit 11 b is connected to the other output side of the plug 17. One side of the smoothing capacitor 11c is connected to one of the output sides of the rectifier circuit 11b. The other side of the smoothing capacitor 11c is connected to the other output side of the rectifier circuit 11b.

  For example, the compressor driving unit 12 includes an inverter. One side of the input side of the compressor drive unit 12 is connected to one side of the smoothing capacitor 11c. The other input side of the compressor drive unit 12 is connected to the other side of the smoothing capacitor 11c. The output side of the compressor drive unit 12 is connected to the input side of the motor 18 of the compressor 6a.

  One of the input sides of the blower drive unit 13 is connected to one side of the smoothing capacitor 11c. The other input side of the blower drive unit 13 is connected to the other side of the smoothing capacitor 11c. The output side of the blower drive unit 13 is connected to the input side of the motor 19 of the blower 5.

  One of the input sides of the switching transformer 14 is connected to one side of the smoothing capacitor 11c. The other input side of the switching transformer 14 is connected to the other side of the smoothing capacitor 11c.

  For example, the detection unit 15 includes a power supply synchronization detection circuit. The detection unit 15 includes a resistor 15a and a photocoupler 15b. One side of the resistor 15a is connected between one side of the plug 17 and the input side of the reactor 11a. One of the input sides of the photocoupler 15b is connected to the other side of the resistor 15a. The other input side of the photocoupler 15b is connected between the other side of the plug 17 and the other input side of the rectifier circuit 11b.

One of the power supply units of the control unit 16 is connected to one of the output sides of the switching transformer 14. The other power supply unit of the control unit 16 is connected to the other output side of the switching transformer 14. One of the signal receiving units of the control unit 16 is connected to one of the output sides of the photocoupler 15b. The other signal receiving unit of the control unit 16 is connected to the other output side of the photocoupler 15b. The signal transmission / reception unit of the control unit 16 is connected to the signal transmission / reception unit of the controller device 7. One of the signal transmission units of the control unit 16 is connected to the signal reception unit of the compressor driving unit 12. The other of the signal transmission units of the control unit 16 is connected to the signal reception unit of the blower driving unit 13.

  In the dehumidifier, when the plug 17 is connected to a commercial power source, the converter circuit 11 is supplied with an AC voltage from the commercial power source. Harmonics of the AC voltage are suppressed by the reactor 11a. The AC voltage is rectified by the rectifier circuit 11b. The rectified voltage becomes a DC bus voltage by being smoothed by the smoothing capacitor 11c. At this time, the smoothing capacitor 11c accumulates the charge.

  The DC bus voltage is supplied to the compressor driving unit 12 and the blower driving unit 13. The compressor drive unit 12 converts the DC bus voltage into an AC voltage having an arbitrary frequency. The compressor drive unit 12 drives the motor 18 of the compressor 6a with the AC voltage. The blower drive unit 13 drives the motor 19 of the blower 5 with the DC bus voltage.

  The switching transformer 14 generates a control power supply voltage from the DC bus voltage. The detection part 15 detects the supply state of the alternating voltage to the rectifier circuit 11b. The detection unit 15 transmits a power supply synchronization signal when the commercial power supply supplies an AC voltage to the rectifier circuit 11b. The detector 15 does not transmit a power supply synchronization signal when the commercial power supply is not supplying an AC voltage to the rectifier circuit 11b.

  The control unit 16 is supplied with a control power supply voltage from the switching transformer 14. The control unit 16 operates with a control power supply voltage. The control unit 16 determines that the power is normally supplied while receiving the power synchronization signal from the detection unit 15, and operates the motors 18 and 19 of the blower 5 and the compressor 6a during operation. During the stop, the motors 18 and 19 are stopped. On the other hand, the control unit 16 starts the operation of the motor 18 of the compressor 6a when the power supply synchronization signal is not received from the detection unit 15. As a result, the residual charge of the smoothing capacitor 11c is rapidly discharged.

Next, a method for discharging the residual charge of the smoothing capacitor 11c will be described with reference to FIG.
FIG. 3 is a flowchart for explaining the operation of the dehumidifier controller 10 according to Embodiment 1 of the present invention.

  In step S1, the control unit 16 determines whether or not a predetermined determination time (for example, 5 seconds) has elapsed since the power supply synchronization signal is no longer received. If the determination time has not elapsed since the control unit 16 no longer receives the power supply synchronization signal in step S1, step S1 is repeated. If the determination time has elapsed since the control unit 16 no longer receives the power supply synchronization signal in step S1, the process proceeds to step S2.

  In step S2, the control unit 16 starts a start program for the motor 18 of the compressor 6a using the residual charge of the smoothing capacitor 11c. Specifically, the control unit 16 sets the rotor of the motor 18 of the compressor 6a through the compressor driving unit 12 to the initial position for smoothly starting before outputting the driving signal. Is controlled to flow a constant DC current. Then, it progresses to step S3 and the control part 16 controls rotation of the motor 18 of the compressor 6a via the compressor drive part 12. FIG.

  According to Embodiment 1 demonstrated above, when the detection part 15 detects interruption | blocking of supply of the alternating voltage to the rectifier circuit 11b, the motor 18 of the compressor 6a starts operation | movement. Specifically, after the rotor of the motor 18 is adjusted to the initial position, the rotation of the motor 18 is controlled. As a result, the residual charge of the smoothing capacitor 11c is discharged. For this reason, the residual charge of the smoothing capacitor 11c can be rapidly discharged by a simple change in the control program of the compressor 6a. Along with this, the initial state of the dehumidifier is stabilized.

  In step S2, the residual charge of the smoothing capacitor 11c is consumed within about 1 second. When the consumption of the charge ends, the control unit 16 does not operate. In this case, it is not possible to proceed to step S3. For this reason, the control unit 16 performs step S2 in a sufficiently short time with respect to the discharge time constant determined by the motor 18 of the compressor 6a and the smoothing capacitor 11c.

  Even during the normal operation of the dehumidifier, the control corresponding to step S2 is necessary. For this reason, the start-up of the compressor 6a is delayed every time. At this time, the delay time is about 1 second to 2 seconds. Considering the product characteristics of a dehumidifier for the purpose of dehumidification, this amount of time is hardly a problem in practical use.

Embodiment 2. FIG.
FIG. 4 is a flowchart for explaining the operation of the dehumidifier controller 10 according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, or an equivalent part. The description of this part is omitted.

  In step S <b> 11, the control unit 16 determines whether or not there is a dehumidifier stop command from the operation device 7. If there is no dehumidifier stop command, step S11 is repeated. If there is an instruction to stop the dehumidifier, the process proceeds to step S12.

  In step S <b> 12, the control unit 16 operates the blower 5 via the blower driving unit 13 in order to eliminate the residual heat of the dehumidifying device 6. The control unit 16 starts a residual heat removal timer. Thereafter, the process proceeds to step S13, and the control unit 16 performs control for adjusting the rotor of the motor 18 of the compressor 6a to the initial position via the compressor drive unit 12. Then, it progresses to step S14 and the control part 16 determines whether the residual heat removal timer was complete | finished.

  If the remaining heat removal timer has not expired in step S14, step S14 is repeated. If the remaining heat removal timer has expired in step S14, the process proceeds to step S15. In step S <b> 15, the control unit 16 stops the blower 5 via the blower driving unit 13. Thereafter, the operation ends.

  According to Embodiment 2 demonstrated above, the control part 16 is the motor 18 of the compressor 6a in the state which operated the air blower 5 to the air blower drive part 13 before the stop of the compressor 6a, when a stop command was received. After the rotor is set to the initial position, the operation of the blower 5 is stopped. For this reason, the sound generated when the rotor is adjusted to the initial position can be made difficult to hear with the sound of the wind from the blower 5.

  Also in the second embodiment, when the plug 17 is disconnected from the commercial power supply after the stop command is executed, the control unit 16 executes the flow of FIG. At this time, the alignment of the initial position of the rotor is completed in the motor 18 of the compressor 6a according to the flow of FIG. For this reason, the sound generated at the time of step S2 in FIG. 3 can be reduced.

  As described above, the dehumidifier control device according to the present invention can be used in a system that discharges the residual charge of the smoothing capacitor by a simple change in the control program of the compressor.

  1 central housing, 2 front housing, 3 rear housing, 4 discharge port, 5 blower, 6 dehumidifier, 6a compressor, 6b condenser, 6c decompressor, 6d evaporator, 7 operation device, 8 water storage tank, DESCRIPTION OF SYMBOLS 9 Suction port, 10 Control apparatus, 11 Converter circuit, 11a Reactor, 11b Rectifier circuit, 11c Smoothing capacitor, 12 Compressor drive part, 13 Blower drive part, 14 Switching transformer, 15 Detection part, 15a Resistance, 15b Photocoupler, 16 Control unit, 17 plug, 18 motor, 19 motor

Claims (1)

A rectifier circuit for rectifying an alternating voltage;
A smoothing capacitor that smoothes the voltage rectified by the rectifier circuit to obtain a DC bus voltage;
A compressor driving unit for driving a compressor used for dehumidification of air by converting a DC bus voltage smoothed by the smoothing capacitor into an AC voltage;
A detection unit for detecting a supply state of an AC voltage to the rectifier circuit;
A blower drive unit that drives a blower that sucks air and exhales dehumidified air; and
A control unit that causes the compressor driving unit to start the operation of the compressor when the detection unit detects the interruption of the supply of the AC voltage to the rectifier circuit;
Equipped with a,
The control unit, after the detection unit detects the interruption of the supply of AC voltage to the rectifier circuit, after adjusting the rotor of the compressor motor to the initial position via the compressor drive unit, When the rotation of the motor of the compressor is controlled and the stop command is received, the rotor of the compressor motor is adjusted to the initial position in a state where the blower drive unit is operated before the compressor is stopped. A dehumidifier controller that stops the operation of the blower later .

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