TWI676347B - Household electrical appliance - Google Patents

Abstract

The home appliance (100) includes an actuator driving unit (17), which is a driving circuit (17a) for driving the actuator, and a temperature sensor (50), which is an actuator that detects the temperature of the actuator. Temperature; power supply part switch (16), which opens and closes the power supply to the actuator drive part (17); a comparison circuit (51), which is connected to a temperature sensor (50), and compares the actuator temperature with a reference The wiring (52) connects the comparison circuit (51) and the power supply switch (16); and the control wiring (43) for switch driving. When the actuator temperature exceeds the reference, the power supply section switch (16) becomes non-conducting based on a change in the output of the comparison circuit (51).

Description

   Home appliances   

The invention relates to a household appliance.

Patent Document 1 described below discloses a technology for protecting inverters from overheating and increasing the temperature when the motor is overloaded or jammed without using a microcomputer hardware circuit.

[Leading Patent Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2005-312570

This patent document 1 discloses a reliable protection in the case of a temperature rise of a motor as an inverter device. By using a temperature protector, a wire directly connected to the motor is used to supply the electric wire before rectifying the supplied mother power to the motor. The method of protecting the power supply from being disconnected from the unreliable microcomputer program that has the possibility of losing control, etc.

However, the temperature protector is a wire directly connected to the three-phase motor, and as shown in the Patent Document 1, it needs to be connected to at least two. This leads to increased complexity and cost of wiring.

When the temperature protector is inserted into the wire before rectifying the mother power supply, it is a frequency conversion device. Generally, a large-capacity capacitor for rectification is assembled. When the power is turned on, it is protected by a surge current prevention method to avoid intense The surge current flows, but for example, when the commercial power supply is greatly changed during the operation of the machine, the resistance for surge prevention is bypassed by the relay or the like, so a large current flows directly to the contact of the temperature protector, Need to choose a larger capacity than the normal current to install.

The present invention was developed by a developer to solve the problems as described above, and an object of the present invention is to provide a home appliance capable of reliably preventing an excessive increase in the temperature of an actuator with a simple configuration.

The home appliance machine of the present invention includes: an actuator; an actuator driving section having a driving circuit for driving the actuator; a temperature sensor for detecting an actuator temperature which is a temperature of the actuator; a power supply section The switch is used to open and close the power supply to the actuator drive unit; the comparison circuit is connected to the temperature sensor and compares the actuator temperature with a reference; When the temperature exceeds the reference, the power supply section switch becomes non-conductive due to the change in the output of the comparison circuit.

According to the present invention, a comparison circuit including a temperature sensor that detects the temperature of the actuator and compares the temperature of the actuator with a reference is provided. When the temperature of the actuator exceeds the reference, the output of the comparison circuit is changed. The switch of the power supply section that opens and closes the power supply to the actuator drive section becomes non-conducting, and with a simple configuration, the temperature of the actuator can be reliably prevented from rising excessively.

1‧‧‧ central frame

2‧‧‧ front box

Box after 3‧‧‧

4‧‧‧Exhaust

5‧‧‧ blower

6‧‧‧ Dehumidifier

6a‧‧‧compressor

7‧‧‧Display operation device

7a‧‧‧Main power switch

8‧‧‧ water tank

9‧‧‧ suction port

10‧‧‧Control device

11‧‧‧Exhaust shutter motor

13‧‧‧AC Power

15‧‧‧Power circuit department

16‧‧‧Power supply switch

17‧‧‧Actuator drive section

17a‧‧‧Drive circuit

17b‧‧‧Second Microcomputer

18‧‧‧Power Detection Department

19‧‧‧ Power sync detection

20‧‧‧Detection switch

30‧‧‧Interface Control Department

30a‧‧‧The first microcomputer

30b‧‧‧Processor

30c‧‧‧Memory

31‧‧‧Display

32‧‧‧Operation Department

32a‧‧‧operation switch

41‧‧‧Signal wiring

42‧‧‧Power wiring

43‧‧‧Control wiring for switch driving

44‧‧‧communication wiring

45‧‧‧Sync signal wiring

50‧‧‧Temperature sensor

51‧‧‧Comparison circuit

52‧‧‧Wiring

53‧‧‧first comparator

54‧‧‧Second Comparator

100‧‧‧Household appliances

101‧‧‧Power Plug

C1‧‧‧The first smoothing capacitor

C2‧‧‧Second smoothing capacitor

Q1‧‧‧NPN Transistor

Q2‧‧‧PNP transistor

PC‧‧‧Photocoupler

Fig. 1 is a cross-sectional view showing the home appliance of the first embodiment.

Fig. 2 is an exploded perspective view showing the home appliance of the first embodiment.

Fig. 3 is a functional block diagram of the home appliance in the first embodiment.

FIG. 4 is a circuit diagram specifically showing an example of a configuration of a comparison circuit included in the home appliance of the first embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In each figure, common or corresponding elements are denoted by the same reference numerals, and repeated description is simplified or omitted.

First Embodiment

FIG. 1 is a cross-sectional view showing the home appliance 100 according to the first embodiment. Fig. 2 is an exploded perspective view showing the home appliance 100 of the first embodiment. The home appliance 100 shown in these figures is a dehumidifier, specifically, a dehumidifier of the type of a portable inverter-driven compressor. The left side of the paper surface in FIG. 1 is regarded as the “front” of the home appliance 100, and the right side of the paper surface in FIG. 1 is regarded as the “back” of the home appliance 100. The housing of the home appliance 100 includes a central housing 1, a front housing 2, and a rear housing 3. The central housing 1 is provided in a central portion of the home appliance 100. The central frame 1 is self-supporting. The front frame 2 is provided on the front side of the center frame 1 so as to be detachable from the center frame 1. The rear frame body 3 is provided on the rear side of the center frame body 1 so as to be detachable from the center frame body 1.

The discharge port 4 is formed in the upper part of the center frame 1. The blower 5 is installed in the center part of the center frame 1 in the front-back direction of the center frame 1. For example, the blower 5 includes a blower fan and a motor. The rotation axis of the blower 5 is parallel to the front-rear direction axis of the home appliance 100 at the central portion of the central housing 1. The rotating shaft system of the blower 5 is oriented horizontally. The dehumidifier 6 is provided on the rear side of the center frame 1. The dehumidifying device 6 includes a compressor 6a, a condenser 6b, a pressure reducing device 6c, and an evaporator 6d. Although not shown in FIGS. 1 and 2, the sensor 12 for humidity detection (see FIG. 3) is provided on a side surface on one side of the central casing 1 at the lower portion of the central casing 1.

The front frame 2 includes a display operation device 7 and a water storage tank 8. The display operation device 7 is provided on the upper part of the front frame 2. Although not shown in FIGS. 1 and 2, the display operation device 7 includes an operation unit 32 (see FIG. 3) and a display unit 31 (see FIG. 3). The water storage tank 8 is provided in the lower part of the front frame body 2. The water storage tank 8 is in a state where the front frame body 2 is attached to the center frame body 1 and is detachable from the front side of the home appliance 100. The rear box body 3 includes a suction port 9. The suction port 9 is provided in the upper part of the rear frame body 3.

The home appliance 100 includes a display operation device 7 and a control device 10. The control device 10 is installed in front of the center frame 1. The control device 10 controls the operation of the blower 5 based on the operation state of the operation portion 32 of the display operation device 7 and the humidity detected by the humidity sensor 12. The motor of the blower 5 is rotated at a rotation speed controlled by the control device 10. As a result, the indoor air A is sucked into the casing from the suction port 9 in the horizontal direction. Then, the air A passes through the evaporator 6b. Next, the blower 5 is directed upward from the discharge port 4 and discharges air B into the room.

The control device 10 controls the operation of the compressor 6 a based on the operation state of the operation unit 32 of the display operation device 7 and the humidity detected by the humidity sensor 12. The compressor 6a rotates at a frequency specified by the control of the control device 10 to compress the refrigerant. The condenser 6d is a refrigerant compressed by the cooling compressor 6a. The pressure reducing device 6c depressurizes the refrigerant cooled by the condenser 6d. The evaporator 6b absorbs heat from the refrigerant depressurized by the pressure reducing device 6c to remove the moisture contained in the air A. As a result, the dehumidified air B is generated. The moisture removed from the air A is stored in the water storage tank 8.

Fig. 3 is a circuit block diagram of the home appliance in the first embodiment. The display operation device 7 includes a main power switch 7a, a display section 31, an operation section 32, an interface control section 30, a comparison circuit 51, and a wiring 52. The wiring from the temperature sensor 50 provided in the compressor 6 a is connected to the display operation device 7. The display unit 31 includes a light emitting diode, a liquid crystal panel, and the like. The operation unit 32 may be configured by mechanical switches such as buttons provided around the display unit 31, or may be implemented by configuring at least a part of the display unit 31 with a touch panel. The operation unit 32 includes an operation switch 32a. The interface control unit 30 is configured around the first microcomputer 30a. Hereinafter, the "first microcomputer 30a" is simply referred to as "the first microcomputer 30a". The first microcomputer 30a performs display processing of a light-emitting diode, a liquid crystal panel, and the like, and performs operation processing of receiving switches, and the like, and processing of taking in a detection signal of the temperature sensor 50 provided in the compressor 6a.

The control device 10 includes a power circuit section 15, a power section switch 16, an actuator driving section 17, a power detection section 18, a power synchronization detection section 19, and a detection section switch 20. The power supply section switch 16 is interposed between the power supply circuit section 15 and the actuator driving section 17. The power supply section switch 16 turns on / off the power supply to the actuator drive section 17. When the power supply section switch 16 is turned on, the power generated by the power supply circuit section 15 is transmitted to the actuator driving section 17. When the power supply section switch 16 is turned off, the power supply system to the actuator drive section 17 is stopped. The detection section switch 20 is an electrical connection between the power plug 101 and the power synchronization detection section 19. The power supply circuit section 15 includes a first smoothing capacitor C1 that stores electric charges when an internal power source is generated. The actuator driving section 17 includes a driving circuit 17a. The drive circuit 17a includes a second smoothing capacitor C2.

The comparison circuit 51 is connected to a wiring from a temperature sensor 50 provided in the compressor 6a. Hereinafter, the temperature of the compressor 6a detected by the temperature sensor 50 is referred to as "actuator temperature". The comparison circuit 51 is connected to the power supply switch 16 via a wiring 52 and a switch driving control wiring 43. The comparison circuit 51 corresponds to an analog circuit having a function of comparing an actuator temperature with a reference. The comparison circuit 51 takes in a detection signal from the temperature sensor 50, and determines the opening and closing of the switch 16 of the power supply unit regardless of the processing or instruction of the first microcomputer 30a according to the value of the signal level. When the temperature of the actuator exceeds the abnormal temperature that becomes the reference, the power supply section switch 16 becomes non-conductive based on the change in the output of the comparison circuit 51. As a modification, at least one of the temperature of the blower 5 and the temperature of the discharge port shutter drive motor 11 may be detected as the "actuator temperature".

The actuator drive unit 17 is connected to the compressor 6a, the blower 5, and the discharge window shutter drive motor 11, and controls the operations of these elements. The actuator driving unit 17 includes a driving circuit 17a for realizing the control, and the driving circuit 17a includes a second microcomputer 17b. Hereinafter, the “second microcomputer 17b” is simply referred to as the “second microcomputer 17b”. The compressor 6a compresses the refrigerant while confirming the condition of the air with the sensor 12 for humidity detection. The discharge port louver drive motor 11 changes the inclination of the louver for changing the direction of air supply from the discharge port 4. The power circuit unit 15 is an internal power source that receives power from the AC power source 13 and generates a DC required for control. The power source detection unit 18 detects that the AC power source 13 is reliably supplied with power. When the power plug 101 is unplugged, the power detection unit 18 can detect the unplug. The power synchronization detection unit 19 detects a zero-cross of the AC power source 13.

One purpose of the power synchronization detecting section 19 is to determine the frequency of the input AC power 13. The other purpose of the power supply synchronization detection unit 19 is to apply as a replacement timer by counting the number of zero crossings. The other purpose of the power synchronization detecting unit 19 is to use the zero-crossing point as a base point to measure a predetermined time to the next zero-crossing. This measurement time can be applied to determine the control timing of the actuator, or can be applied to the control of the power supply circuit section 15 as needed.

The home appliance 100 includes a "standby mode". The standby mode is a state in which the power of the home appliance 100 is turned on due to the input of the main power switch 7a, but the actuators such as the compressor 6a are not driven. The standby mode is executed when the power supply of the home appliance 100 is turned on and the operation switch 32a of the operation unit 32 is not turned on. For example, immediately after the power source of the home appliance 100 is turned on, the period from when the operation switch 32a for turning on the dehumidification is actually turned on is set to the standby mode. For example, when the operation switch 32a is turned on once after the power of the home appliance 100 is turned on, and then the operation switch 32a is turned off, the standby mode is also executed. Alternatively, for example, after the power of the home appliance 100 is turned on and the operation switch 32a is turned on, dehumidification is performed for a predetermined time set by a timer, and the dehumidification is automatically switched to inactive, and the standby mode is executed.

During the execution of the "standby mode", the power supply unit switch 16 is set to be non-conductive, and the actuator drive unit 17 is disabled. As a result, standby power is reduced. Because the power synchronization detection unit 19 needs to detect the zero-crossing point correctly, the power synchronization detection unit 19 is a low-impedance circuit that is hardly affected by disturbance. Therefore, the power consumption of the power supply synchronization detection unit 19 is large. By setting the detection section switch 20 to be non-conductive during the execution of the standby mode, the power supply synchronization detection section 19 is separated from the AC power supply 13. This reduces standby power.

The display operation device 7 and the control device 10 are connected via a signal wiring 41, a power supply wiring 42, a switch driving control wiring 43, and a communication wiring 44. The signal wiring 41 transmits a detection signal from the control device 10 to the display operation device 7 to output the presence or absence of power supply from the AC power source 13. The signal wiring 41 directly connects the power source detection unit 18 and the interface control unit 30 without interposing other circuits.

The signal wiring 41 can transmit a detection signal indicating that AC power is not input to the interface control unit 30 in a very short time. If the power detection unit 18 detects that no AC power is input, it is better to set the interface control unit 30 to a stopped state at a timing much faster than the voltage of the first smoothing capacitor C1 lower than the operating voltage of the interface control unit 30. If the power detection unit 18 detects that no AC power is input, it is better to transmit the detection signal to the interface control unit 30 within a sufficiently short time such as tens of msec. The system within a few tens of msec is specifically 10msec to 90msec, and the system is preferably as short as possible.

The power supply wiring 42 supplies a direct-current power generated by the power supply circuit unit 15 to the display operation device 7. The switch driving control wiring 43 transmits an on / off command to the power supply section switch 16 and the detection section switch 20 from the display operation device 7. The wiring 52 from the comparison circuit 51 is connected in the middle of the wiring of the switch driving control wiring 43 located in the display operation device 7.

The communication wiring 44 is a two-way wiring for exchanging information between the interface control unit 30 and the actuator driving unit 17, and the communication wiring 44 is based on the operation information of the interface control unit 30 and periodically transmits the actuator operation instruction to Actuator actuator 17. Here, at least the compressor 6a, the blower 5, and the discharge window shutter drive motor 11 are called "actuators." The communication wiring 44 transmits information such as the monitoring of the operation status and abnormality of each actuator from the actuator driving unit 17 to the interface control unit 30 as a reply to the above-mentioned actuator operation instruction. This communication is a regular communication performed at regular intervals. The synchronization signal wiring 45 transmits a power synchronization signal which is an output signal of the power synchronization detection unit 19 to the actuator driving unit 17.

The function of the power detection section 18 will be described in detail. When power is supplied from the AC power source 13, the DC power is supplied from the power circuit unit 15 to the display operation device 7, so the display operation device 7 is always operated. Since the operation system of the display operation device 7 can be regarded as being supplied with power from the AC power source 13, it does not seem to be necessary to provide the power source detection unit 18 intentionally. However, the power supply circuit unit 15 includes a large first smoothing capacitor C1 because it requires frequency conversion control. Furthermore, in the embodiment, when the actuator is stopped, the power supply unit switch 16 and the detection unit switch 20 are set to be non-conducting so as to prevent useless standby current from flowing. As a result, even after the AC power source 13 is disconnected, power is continuously supplied to the display operation device 7 by the residual voltage of the first smoothing capacitor C1.

The power source detection unit 18 transmits a detection signal to the first microcomputer 30 a of the interface control unit 30 when it detects that there is no AC power from the AC power source 13. This detection signal is transmitted through the signal wiring 41 in a very short time. When the interface control unit 30 receives a detection signal indicating that there is no AC power from the AC power source 13, it executes a predetermined "stop process".

The temperature sensor 50 is provided on the outer frame of the compressor 6a, and measures the temperature of the outer frame of the compressor 6a as the actuator temperature. The output of the temperature sensor 50 is input to the comparison circuit 51. When the output of the temperature sensor 50 becomes a predetermined comparison value, the output of the comparison circuit 51 is inverted. That is, when the actuator temperature exceeds the abnormal temperature that becomes the reference, the output of the comparison circuit 51 is inverted. When the output of the comparison circuit 51 is reversed, the change in the output is transmitted through the wiring 52 and the switch driving control wiring 43 so that the power supply section switch 16 and the detection section switch 20 become non-conductive. As a result, since the power supply to the actuator drive unit 17 is cut off regardless of the instructions from the interface control unit 30, the compressor 6a, the blower 5, and the discharge port shutter drive motor 11 are stopped.

The predetermined value set in the comparison circuit 51 is determined, for example, based on the relationship between the limit temperature of the motor winding of the compressor 6a and the outer temperature of the motor when the winding is near the limit temperature. For example, when the limit temperature of the motor winding is taken as 190 ° C, and the outline temperature of the compressor 6a when the temperature is reached is taken as 120 ° C, it is set to 110 ° C and has a margin of 10 ° C. In this case, when the temperature of the actuator exceeds 110 ° C., which is equivalent to a reference abnormal temperature, the output of the comparison circuit 51 is reversed, and the power supply section switch 16 is turned off.

When the temperature of the compressor 6a rises and the actuator temperature reaches an abnormal temperature, the output of the comparison circuit 51 is reversed via the wiring 52 and the switch driving control wiring 43 to make the power supply switch 16 non-conducting. 6a. The blower 5 and the discharge window shutter drive motor 11 are stopped. In this case, since the operation of the first microcomputer 30a is not performed, the communication between the interface control unit 30 and the actuator driving unit 17 is abnormal. In this case, in order to accurately display the status on the display unit 31, it may be made as shown below.

In this embodiment, the output of the temperature sensor 50 is also input to the first microcomputer 30a. When the actuator temperature detected by the temperature sensor 50 exceeds the abnormal temperature, and the communication between the interface control section 30 and the actuator driving section 17 is abnormal, the first microcomputer 30a determines that the first microcomputer has not been used. At 30a, the power supply to the actuator drive unit 17 is cut off, and the display unit 31 displays an abnormal display indicating an overheating abnormality of the compressor 6a. In this way, the user can be notified of the situation correctly.

In addition, the first microcomputer 30a may be equipped with a function for forcing the compressor 6a to stop by the comparison circuit 51, and in accordance with the value of the connected temperature sensor 50, the performance reduction command is transmitted to the compressor 6a in sections. While avoiding forced stop. For example, the first microcomputer 30a may be prepared so as to reduce the output of the compressor 6a and send a command to the actuator driving unit 17 before the actuator temperature detected by the temperature sensor 50 exceeds the abnormal temperature. In this way, the temperature rise of the compressor 6a can be suppressed, and the possibility of forced stop of the compressor 6a can be reduced.

FIG. 4 is a circuit diagram specifically showing an example of the configuration of a comparison circuit 51 included in the home appliance 100 of the first embodiment. In Fig. 4, an example of the elements corresponding to the above-mentioned constituent elements is given the same reference numeral. An example of the configuration of the power supply section switch 16 shown in FIG. 4 includes an NPN transistor Q1, a PNP transistor Q2, and a photocoupler PC. The output of the first microcomputer 30a is connected to one end of the switch driving control wiring 43 via a resistor R714. The other end of the switch driving control wiring 43 is connected to the base of the NPN transistor Q1. The light-emitting diode system of the photocoupler PC is connected to the collector of the NPN transistor Q1. The collector of the photoelectric crystal of the photocoupler PC is connected to the base of the PNP transistor Q2. The emitter of the PNP transistor Q2 is connected to the actuator driving unit 17. When the output of the first microcomputer 30a changes from a low level to a high level, the NPN transistor Q1 is turned on by the output of the first microcomputer 30a via the switch driving control wiring 43. Since the current flows to the light-emitting diode of the photocoupler PC, the photocoupler The photoelectric crystal of the PC becomes conductive. As a result, the PNP transistor Q2 becomes conductive, and power is supplied from the power circuit section 15 to the actuator driving section 17.

In the following description, as an example, it will be described that the temperature sensor 50 has an NTC (Negative Temperature Coefficient) temperature measurement resistor. The NTC temperature measurement resistor has a characteristic that the resistance value decreases when the temperature increases, and the comparison circuit 51 includes an output. Case of comparator IC constructed for open collector. The comparison circuit 51 includes a first comparator 53 and a second comparator 54. The NTC temperature measuring resistor is an example of a component whose resistance value changes depending on the temperature.

At point a where the first comparator 53 is the inverting input (-), the divided voltage of the resistor R11 and the temperature sensor 50 is input. The voltage at point a varies according to a change in the resistance value of the temperature sensor 50. At point b of the non-inverting input (+) of the first comparator 53, a divided voltage of a circuit composed of a resistor R716, a resistor R717, a resistor R718, a resistor R719, a resistor R720, and a resistor R721 is input. When the actuator temperature is lower than the abnormal temperature, because the resistance value of the temperature sensor 50 is large, the voltage at the inverting input (-) a becomes higher than the voltage at the non-inverting input (+) b. When the voltage at the inverting input (-) a is higher than the voltage at the non-inverting input (+) b, the voltage at the point c of the output of the first comparator 53 becomes a low level.

When the temperature sensor 50 detects a high temperature, the resistance value of the temperature sensor 50 decreases. When the actuator temperature reaches the abnormal temperature, the voltage at the inverting input (-) a becomes lower than the voltage at the non-inverting input (+) b. As a result, the output of the first comparator 53 is inverted from the low level to the high level. The output of the first comparator 53 at a high level is a voltage value divided by the resistor R716, the resistor R717, the resistor R718, the resistor R719, the resistor R720, and the resistor R721.

In this embodiment, the first comparator 53 sets a difference, that is, a hysteresis, in order to prevent chattering near a threshold value. Explain the principle. When the voltage at the point a becomes lower than the voltage at the point b, the voltage at the point c becomes higher because the open-collector of the output of the point c changes from the conducting state to the open state. Therefore, the direction of the current flowing to the resistor R719 is reversed from the point b to the point c. Because the current flows from the point c to the point b, the voltage at the point b also becomes high. As a result, the voltage difference between the point b and the point a becomes large, and the jitter of the output at the point c near the threshold value can be prevented. The differential temperature may be set to about 5 ° C, for example.

The output of the first comparator 53 is input to the inverted input (-) of the second comparator 54. The output terminal of the second comparator 54 is connected to the switch driving control wiring 43 via a wiring 52. The second comparator 54 in this embodiment is an element inserted only to invert the output of the first comparator 53. Instead of the second comparator 54, for example, using an NPN transistor, the same effect can be obtained.

Sorting out the above, when the temperature sensor 50 detects a high temperature, the resistance value of the temperature sensor 50 decreases, and when the actuator temperature reaches an abnormal temperature, the voltage at point a of the first comparator 53 becomes the voltage at point b. the following. As a result, the output of the first comparator 53 is inverted from the low level to the high level. In the second comparator 54, the output is further inverted. That is, the output of the second comparator 54 is inverted from a high level to a low level. When the low-level output of the second comparator 54 is transmitted to the switch-driving control wiring 43 via the wiring 52, the voltage of the switch-driving control wiring 43 becomes low, whereby the NPN transistor Q1 becomes non-conducting because the current does not The light-emitting diode that flows to the photocoupler PC, so the PNP transistor Q2 becomes non-conducting. As a result, the power supply section switch 16 is turned off, the power supply to the actuator drive section 17 is cut off, and equipment such as the compressor 6a is stopped.

When the power supply to the actuator drive unit 17 is cut off by the operation of the comparison circuit 51, the communication (communication wiring) 44 for timing communication cannot be established, so the interface control unit 30 and the actuator drive unit 17 A communication error occurred between them. On the other hand, because the actuator temperature detected by the temperature sensor 50 is also input to the first microcomputer 30a, when the actuator temperature reaches the abnormal determination level, the first microcomputer 30a is judged programmatically. The motor is abnormally heated up excessively, and a display indicating the abnormality may be displayed on the display unit 31. In addition, the first microcomputer 30a can detect in advance that the actuator temperature is approaching an abnormal level before the forced disconnection by the comparison circuit 51 occurs. Therefore, the operating performance of the compressor 6a can be gradually reduced in stages along with the temperature rise. .

The first comparator 53 feedbacks the output to the non-inverting input (+) side in order to set a difference when the actuator temperature reaches an abnormal temperature. Therefore, the non-inverting input (+) side is different from the threshold value when the actuator temperature detected by the temperature sensor 50 is in the normal operating range and when it is abnormal. When the temperature sensor 50 is connected to the non-inverting input (+), the voltage changes according to the above-mentioned difference setting. Therefore, when the temperature sensor 50 is connected to the first microcomputer 30a, the temperature is converted in the program. A difference occurs. On the other hand, as shown in this embodiment, such a problem can be avoided by inverting the input (-) side of the temperature sensor 50 and the first comparator 53.

As described above, according to the present embodiment, it is possible to reliably prevent the temperature of the actuator from increasing excessively with a simple configuration. According to this embodiment, the actuators of the compressor 6a and the like can be reliably protected without depending on the programs of the first microcomputer 30a or the second microcomputer 17b which may be out of control or the like. In the present embodiment, the power supply section switch 16 that cuts off the signal line on the secondary side rectified by the power supply circuit section 15 is used to open and close the power supply to the actuator drive section 17. According to this structure, a low-cost switch and small power wiring of less than 1 W can be realized. In this embodiment, the output of the second comparator 54, that is, the output of the comparison circuit 51 is input to the switch driving control via the wiring 52. Wiring 43. As a modification, a switch may be provided in a connection portion between the wiring 52 and the switch driving control wiring 43. When the output of the comparison circuit 51 is reversed, the switch changes from conducting to non-conducting, and the power supply switch 16 becomes non-conducting. Continuity.

Each function of the first microcomputer 30a may also be implemented by a processing circuit. In the example shown in FIG. 3, the processing circuit of the first microcomputer 30a includes at least one processor 30b and at least one memory 30c. When the processing circuit includes at least one processor 30b and at least one memory 30c, each function of the first microcomputer 30a may be implemented by software, firmware, or a combination of software and firmware. At least one of the software and the firmware may be described as a program. At least one of the software and the firmware may be stored in the at least one memory 30c. It is also possible that at least one processor 30b implements functions of the first microcomputer 30a by reading and executing programs stored in at least one memory 30c. The at least one memory 30c may include a nonvolatile or volatile semiconductor memory, a magnetic disk, or the like.

The processing circuit of the first microcomputer 30a may include at least one dedicated hardware. When the processing circuit includes at least one dedicated hardware, the processing circuit may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field Programmable) Gate Array), or a combination of these. The functions of each part of the first microcomputer 30a may be realized by processing circuits, respectively. In addition, the functions of the units of the first microcomputer 30a may be realized collectively by processing circuits. Each function of the first microcomputer 30a may be implemented by dedicated hardware, and other portions may be implemented by software or firmware. The processing circuit can also implement various functions of the first microcomputer 30a by using hardware, software, firmware, or a combination of these. The configuration of the second microcomputer 17b is the same as that described above.

Claims (6)

A household electrical appliance includes: an actuator; an actuator driving unit having a driving circuit for driving the actuator; a temperature sensor that detects an actuator temperature that is the temperature of the actuator; a power source An external switch to open and close the power supply to the actuator drive unit; a comparison circuit connected to the temperature sensor to compare the actuator temperature with a reference; and a wiring to connect the comparison circuit to the power supply When the temperature of the actuator exceeds the reference, the power supply partial switch becomes non-conducting based on a change in the output of the comparison circuit. For example, for a household electrical appliance applying for item 1 of the patent scope, the temperature sensor has a component whose resistance value changes in response to temperature; the comparison circuit includes a comparator, and the comparator is based on a change in the resistance value of the component The fluctuating voltage is compared with the voltage generated by the resistance divided voltage. For example, the household electrical appliance applying for the second item of the patent scope, wherein the component is connected to the inverting input of the comparator. For example, a household electrical appliance according to any one of claims 1 to 3 includes a control means for controlling the output of the actuator according to the temperature of the actuator; the control means is when the temperature of the actuator exceeds the reference Previously, the output of this actuator was reduced. For example, a household electrical appliance according to any one of claims 1 to 3 includes: an operation part; a display part; and an interface control part connected to the temperature sensor, the operation part, and the display part, and according to The operation accepted by the operation unit supplies an operation command to the actuator drive unit; when the temperature of the actuator exceeds the reference, and a communication abnormality occurs between the interface control unit and the actuator drive unit, An overheating abnormality of the actuator is displayed on the display portion. For example, a household electrical appliance according to any of claims 1 to 3, including a microcomputer instructed under the control of the actuator; when the temperature of the actuator exceeds the reference, regardless of the instruction of the microcomputer, When the output of the comparison circuit is changed, the power supply section switch becomes non-conductive.