CN214013859U - Direct current motor protection circuit and air conditioner - Google Patents
Direct current motor protection circuit and air conditioner Download PDFInfo
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- CN214013859U CN214013859U CN202021903367.1U CN202021903367U CN214013859U CN 214013859 U CN214013859 U CN 214013859U CN 202021903367 U CN202021903367 U CN 202021903367U CN 214013859 U CN214013859 U CN 214013859U
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Abstract
The utility model discloses a direct current motor protection circuit and air conditioner, this direct current motor protection circuit include detecting element, settlement unit and comparison unit, and detecting element is used for detecting direct current motor's direct current bus voltage, and settlement unit is used for setting for direct current bus voltage threshold value, and comparison unit is used for with direct current bus voltage threshold value carries out the comparison, and direct current bus voltage surpasss to direct current motor speed control port's control pin output low level signal during direct current bus voltage threshold value, so that direct current motor stall has realized when direct current motor's input voltage is too high, in time stops direct current motor operation to protection direct current motor is not damaged, and has reduced the resource that occupies of singlechip, has improved direct current motor's life.
Description
Technical Field
The application relates to the field of air conditioner control, in particular to a direct current motor protection circuit and an air conditioner.
Background
The existing inverter air conditioner generally has a direct current motor, and if the input voltage of the direct current motor is too high and exceeds the rated voltage, the problems that the direct current motor is damaged or a controller is burnt out and the like to influence the service life of the air conditioner can be caused.
An outdoor Unit of an existing variable frequency air conditioner generally has a PFC (Power Factor Correction) circuit, detects and samples an ac input voltage and a dc bus voltage, and then sets an overvoltage protection value for the ac voltage and the dc bus voltage in software, and when an excessively high voltage is detected, an outdoor Unit MCU (micro controller Unit) may directly turn off a PWM (Pulse Width Modulation) output of a dc motor to stop the operation of the dc motor.
However, in the prior art, by means of software protection, not only is the singlechip resource occupied additionally, but also the protection speed is slow compared with a hardware mode, and the requirements on the precision of a sampling signal and the reliability of software are high.
Therefore, how to provide a protection circuit for a dc motor to realize fast and accurate protection of the dc motor and reduce the occupied resources of a single chip microcomputer is a technical problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a direct current motor protection circuit for it is slower to direct current motor's protection speed among the solution prior art, and need additionally occupy the technical problem of singlechip resource.
In some embodiments of the present application, the circuit comprises:
the detection unit is used for detecting the direct-current bus voltage of the direct-current motor;
the setting unit is used for setting a direct current bus voltage threshold value;
the comparison unit is used for comparing the direct current bus voltage with the direct current bus voltage threshold value and outputting a low-level signal to a control pin of a speed control port of the direct current motor when the direct current bus voltage exceeds the direct current bus voltage threshold value so as to stop the direct current motor;
the first end of the detection unit is connected with a direct-current bus of the direct-current motor, the second end of the detection unit is connected with the second end of the comparison unit, the third end of the detection unit and the fourth end of the setting unit are connected to a grounding end in a common mode, the first end of the setting unit is connected with the grounding end, the second end of the setting unit is connected with a direct-current power supply of the direct-current motor, the second end of the setting unit is further connected with the fifth end of the comparison unit, the third end of the setting unit is connected with the third end of the comparison unit, the first end of the comparison unit is connected with the control pin through a diode, and the fourth end of the comparison unit is connected with the grounding end.
In some embodiments of the present application, the comparing unit is specifically a comparator, wherein a first end of the comparing unit is an output end of the comparator, a second end of the comparing unit is a negative phase input end of the comparator, a third end of the comparing unit is a positive phase input end of the comparator, a fourth end of the comparing unit is a negative power end of the comparator, and a fifth end of the comparing unit is a positive power end of the comparator.
In some embodiments of the present application, the comparing unit further includes a sixth resistor, wherein a first terminal of the sixth resistor is connected to the output terminal, and a second terminal of the sixth resistor is connected to the non-inverting input terminal.
In some embodiments of the present application, the setting unit includes a first capacitor, a fourth resistor, and a fifth resistor, a first end of the first capacitor is a first end of the setting unit, a common point of a second end of the first capacitor and a first end of the fourth resistor is a second end of the setting unit, a common point of a second end of the fourth resistor and a first end of the fifth resistor is a third end of the setting unit, and a second end of the fifth resistor is a fourth end of the setting unit.
In some embodiments of the present application, the detecting unit includes a first resistor, a second resistor, and a third resistor, wherein a first end of the first resistor is a first end of the detecting unit, a second end of the first resistor is connected to a first end of the second resistor, a common point of the second end of the second resistor and the first end of the third resistor is a second end of the detecting unit, and a second end of the third resistor is a third end of the detecting unit.
Corresponding with the direct current motor protection circuit in this application embodiment, this application embodiment has still provided an air conditioner, includes as above direct current motor protection circuit, still includes:
the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the four-way valve is used for controlling the flow direction of refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;
the direct current motor is used for driving the fan to rotate;
an indoor environment temperature sensor for detecting an indoor environment temperature;
and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.
Through using above technical scheme, direct current motor protection circuit includes the detecting element, set for unit and comparison unit, the direct current bus of direct current motor is connected to the detecting element first end, comparison unit can compare the direct current bus voltage that detects with the direct current bus voltage threshold value that sets for the unit, when direct current bus voltage surpassed direct current bus voltage threshold value, comparison unit teaches the output low level to the control tube of direct current motor speed control port, so that direct current motor stall, come to protect direct current motor through the mode of hardware, its protection speed is fast, and more accurate and reliable, the resource that occupies of singlechip has been reduced, direct current motor's life has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram showing an outline of the structure of an air conditioner of the embodiment;
fig. 2 shows a schematic structural diagram of a dc motor protection circuit according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a protection circuit for a dc motor according to another embodiment of the present invention.
Description of the reference symbols
1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 10: a refrigerant circuit; 11: a compressor; 12: a four-way valve; 13: an outdoor heat exchanger;
14: an expansion valve; 16: an indoor heat exchanger; 21: an outdoor fan; 31: an indoor fan; 32: an indoor temperature sensor; 33: indoor heat exchanger temperature sensor.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
Fig. 1 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of executing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected by a connecting pipe 4 to form a refrigerant circuit 10 in which a refrigerant circulates. The refrigerant circuit 10 includes a compressor 11, an outdoor heat exchanger 13, an expansion valve 14, an accumulator 15, and an indoor heat exchanger 16. Among them, the indoor heat exchanger 16 and the outdoor heat exchanger 13 operate as a condenser or an evaporator. The compressor 11 sucks the refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The compressor 11 is an inverter compressor with variable capacity that performs rotational speed control by an inverter, and the four-way valve 12 switches between heating and cooling.
The outdoor heat exchanger 13 has a first inlet and a second outlet for allowing the refrigerant to flow between the refrigerant and the suction port of the compressor 11 through the accumulator 15, and the refrigerant flows between the refrigerant and the expansion valve 14. The outdoor heat exchanger 13 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer pipe (not shown) connected between the second inlet and the first inlet of the outdoor heat exchanger 13.
The expansion valve 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 is configured to be capable of changing the opening degree, and by decreasing the opening degree, the flow path resistance of the refrigerant passing through the expansion valve 14 is increased, and by increasing the opening degree, the flow path resistance of the refrigerant passing through the expansion valve 14 is decreased. The expansion valve 14 expands and decompresses the refrigerant flowing from the indoor heat exchanger 16 to the outdoor heat exchanger 13 during the heating operation. Further, even if the states of other devices installed in the refrigerant circuit 10 do not change, when the opening degree of the expansion valve 14 changes, the flow rate of the refrigerant flowing in the refrigerant circuit 10 changes.
The indoor heat exchanger 16 has a second inlet and outlet for allowing the liquid refrigerant to flow between the expansion valve 14 and the indoor heat exchanger, and has a first inlet and outlet for allowing the gas refrigerant to flow between the compressor 11 and the discharge port. The indoor heat exchanger 16 exchanges heat between the refrigerant flowing through the heat transfer pipe connected between the second inlet and the first inlet and the second outlet of the indoor heat exchanger 16 and the indoor air.
An accumulator 15 is disposed between the outdoor heat exchanger 13 and the suction port of the compressor 11. In the accumulator 15, the refrigerant flowing from the outdoor heat exchanger 13 to the compressor 11 is separated into a gas refrigerant and a liquid refrigerant. Then, the gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
The outdoor unit 2 further includes an outdoor fan 21, and the outdoor fan 21 generates an airflow of outdoor air passing through the outdoor heat exchanger 13 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the outdoor air. The outdoor fan 21 is driven by an outdoor fan motor 21A capable of changing the rotation speed. The indoor unit 3 further includes an indoor fan 31, and the indoor fan 31 generates an airflow of the indoor air passing through the indoor heat exchanger 16 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the indoor air. The indoor fan 31 is driven by an indoor fan motor 31A whose rotation speed can be changed.
As described in the background art, in the prior art, protection of the dc motor is basically performed by a software manner, which not only needs to occupy additional resources of the single chip, but also has a slow protection speed and a low reliability of the software itself.
In order to solve the above problem, an embodiment of the present application provides a dc motor protection circuit, including a detection unit, a setting unit, and a comparison unit, a first end of the detection unit is connected to a dc bus of a dc motor, the detection unit detects a voltage of the dc bus, the comparison unit compares the detected dc bus voltage with a dc bus voltage threshold set by the setting unit, when the dc bus voltage exceeds the dc bus voltage threshold, the comparison unit outputs a low level to a control pipe of a speed control port of the dc motor, so as to stop the operation of the dc motor, and implement rapid and accurate protection of the dc motor.
As shown in fig. 2, the dc motor protection circuit includes:
a detection unit 201, configured to detect a dc bus voltage of the dc motor;
a setting unit 202, configured to set a dc bus voltage threshold;
a comparing unit 203, configured to compare the dc bus voltage with the dc bus voltage threshold, and output a low level signal to a control pin of a speed control port of the dc motor when the dc bus voltage exceeds the dc bus voltage threshold, so as to stop the operation of the dc motor;
a first end of the detection unit 201 is connected to the dc bus of the dc motor, a second end of the detection unit 201 is connected to a second end of the comparison unit 203, a third end of the detection unit 201 and a fourth end of the setting unit 202 are commonly connected to a ground terminal, the first end of the setting unit 202 is connected to the ground terminal, the second end of the setting unit 202 is connected to the dc power supply of the dc motor, the second end of the setting unit 202 is further connected to a fifth end of the comparison unit 203, the third end of the setting unit 202 is connected to the third end of the comparison unit 203, the first end of the comparison unit 203 is connected to the control pin through a diode V1, and the fourth end of the comparison unit 203 is connected to the ground terminal.
Specifically, the speed and accuracy of protection of the dc motor are improved by a hardware protection mode in the present application, in the embodiment of the present application, the detection unit 201 is arranged to detect the dc bus voltage of the dc motor, meanwhile, the setting unit 202 sets a dc bus voltage protection threshold, finally, the comparison unit 203 compares the detected dc bus voltage with the dc bus voltage threshold, when the dc bus voltage exceeds the dc bus voltage threshold, the comparison unit outputs a low level signal to the control pin of the speed control port of the dc motor, and pulls down the signal of the control pin, even if the controller continues to output a control signal to the dc motor, the information of the control pin is always kept at 0, and the motor stops operating, thereby achieving the effect of protecting the dc motor.
It should be noted that the above embodiment is only one specific implementation manner proposed in the present application, and a person skilled in the art may select a connection structure between the units according to practical situations, which does not affect the protection scope of the present application.
In order to more accurately compare the dc bus voltage with the dc bus voltage threshold, as shown in fig. 3, in this embodiment of the application, the comparing unit 203 is specifically a comparator, wherein a first terminal of the comparing unit 203 is an output terminal of the comparator, a second terminal of the comparing unit 203 is a negative-phase input terminal of the comparator, a third terminal of the comparing unit 203 is a positive-phase input terminal of the comparator, a fourth terminal of the comparing unit 204 is a negative-power terminal of the comparator, and a fifth terminal of the comparing unit 203 is a positive-power terminal of the comparator.
It should be noted that the above embodiment is only one specific implementation proposed in the present application, and those skilled in the art can flexibly select other comparing unit 203 structures according to practical situations, which does not affect the protection scope of the present application.
In order to prevent the current passing through the comparing unit 203 from being too large, in the embodiment of the present application, the comparing unit 203 further includes a sixth resistor R6, wherein a first terminal of the sixth resistor R6 is connected to the output terminal, and a second terminal of the sixth resistor R6 is connected to the non-inverting input terminal.
Specifically, the sixth resistor R6 is connected to the comparison unit 203, so that a part of the current is distributed when the current passing through the comparison unit 203 is too large, and the circuit is prevented from being damaged due to the too large current passing through the comparison unit 203.
It should be noted that the above embodiment is only one specific implementation manner proposed in the present application, and those skilled in the art may flexibly select other manners of protecting the comparison unit 203 according to practical situations, which does not affect the protection scope of the present application.
In order to better set the dc bus voltage threshold, in the embodiment of the present application, the setting unit 202 includes a first capacitor C1, a fourth resistor R4, and a fifth resistor R5, a first end of the first capacitor C1 is a first end of the setting unit 202, a common point between a second end of the first capacitor C1 and a first end of the fourth resistor R4 is a second end of the setting unit 202, a common point between a second end of the fourth resistor R4 and a first end of the fifth resistor R5 is a third end of the setting unit 202, and a second end of the fifth resistor R5 is a fourth end of the setting unit 202.
It should be noted that the above embodiment is only one specific implementation manner proposed in the present application, and those skilled in the art select other configurations of the setting unit 202 according to practical situations, which does not affect the protection scope of the present application.
In order to better detect the dc bus voltage, in the embodiment of the present application, the detecting unit 201 includes a first resistor R1, a second resistor R2, and a third resistor R3, wherein a first end of the first resistor R1 is a first end of the detecting unit 201, a second end of the first resistor R1 is connected to a first end of the second resistor R2, a common point of a second end of the second resistor R2 and a first end of the third resistor R3 is a second end of the detecting unit 201, and a second end of the third resistor R3 is a third end of the detecting unit 201, where the resistors in the detecting unit 201 are not limited to three resistors, the resistors in the detecting unit 201 are mainly obtained by voltage division, and at least two resistors are required, and the three resistors R1, R2, and R3 in the present application are only one of them.
It should be noted that the above solution of the preferred embodiment is only a specific implementation manner proposed in the present application, and those skilled in the art can flexibly select other structures of the detecting unit 201 according to the actual situation, which does not affect the protection scope of the present application.
The working principle of the dc motor protection circuit in the embodiment of the present application is described below with reference to fig. 3:
as shown in fig. 3, a first end of a first resistor R1 in the detection unit 201 is connected to a dc bus of the dc motor, the dc bus voltage is divided by a first resistor R1, a second resistor R2 and a third resistor R3, and a detection value is input to a negative phase input terminal of the comparator.
A common junction point of the second end of the first capacitor C1 and the first end of the fourth resistor R4 in the setting unit 202 is connected to a dc power supply of the dc motor, the control voltage of the dc power supply is 15V, the common junction point is also connected to a positive power supply terminal of the comparator, the control voltage is divided by the fourth resistor R4 and the fifth resistor R5 to set a dc bus voltage threshold, and the dc bus voltage threshold is input to a non-inverting input terminal of the comparator.
The output end of the comparator is connected with a control pin of a speed control port of the direct current motor through a diode V1, when the voltage of the direct current bus exceeds the voltage threshold value of the direct current bus, a low level signal is output to the control pin, the control pin signal of the speed control port of the direct current motor is pulled down, even if the controller continues to output the control signal, the control pin signal of the speed control port of the direct current motor is always kept at 0, the direct current motor is in a stop state, and therefore the effect of protecting the direct current motor is achieved, meanwhile, a sixth resistor R6 is further arranged to be connected with the comparator, and the circuit is prevented from being damaged due to the fact that the current passing through the comparator is too large.
By applying the above technical scheme, the detection unit 201 divides the dc bus voltage through the first resistor R1, the second resistor R2 and the third resistor R3, and inputs the detection value to the negative phase input end of the comparator in the comparison unit 203, the setting unit 202 inputs the set dc bus voltage threshold to the positive phase input end of the comparator, when the dc bus voltage exceeds the dc bus voltage threshold, the output end of the comparator outputs a low level signal to the control pin of the speed control port of the dc motor, so that the dc motor stops operating, and the dc motor is protected quickly and accurately when the voltage is too high.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. A dc motor protection circuit, the circuit comprising:
the detection unit is used for detecting the direct-current bus voltage of the direct-current motor;
the setting unit is used for setting a direct current bus voltage threshold value;
the comparison unit is used for comparing the direct current bus voltage with the direct current bus voltage threshold value and outputting a low-level signal to a control pin of a speed control port of the direct current motor when the direct current bus voltage exceeds the direct current bus voltage threshold value so as to stop the direct current motor;
the first end of the detection unit is connected with a direct-current bus of the direct-current motor, the second end of the detection unit is connected with the second end of the comparison unit, the third end of the detection unit and the fourth end of the setting unit are connected to a grounding end in a common mode, the first end of the setting unit is connected with the grounding end, the second end of the setting unit is connected with a direct-current power supply of the direct-current motor, the second end of the setting unit is further connected with the fifth end of the comparison unit, the third end of the setting unit is connected with the third end of the comparison unit, the first end of the comparison unit is connected with the control pin through a diode, and the fourth end of the comparison unit is connected with the grounding end.
2. The dc motor protection circuit according to claim 1, wherein the comparing unit is specifically a comparator, wherein a first terminal of the comparing unit is an output terminal of the comparator, a second terminal of the comparing unit is a negative input terminal of the comparator, a third terminal of the comparing unit is a positive input terminal of the comparator, a fourth terminal of the comparing unit is a negative power terminal of the comparator, and a fifth terminal of the comparing unit is a positive power terminal of the comparator.
3. The dc motor protection circuit of claim 2, wherein the comparison unit further comprises a sixth resistor, wherein a first terminal of the sixth resistor is connected to the output terminal and a second terminal of the sixth resistor is connected to the non-inverting input terminal.
4. The direct-current motor protection circuit according to claim 1, wherein the setting unit includes a first capacitor, a fourth resistor, and a fifth resistor, a first end of the first capacitor is a first end of the setting unit, a common point of a second end of the first capacitor and the first end of the fourth resistor is a second end of the setting unit, a common point of a second end of the fourth resistor and the first end of the fifth resistor is a third end of the setting unit, and a second end of the fifth resistor is a fourth end of the setting unit.
5. The direct current motor protection circuit according to claim 1, wherein the detection unit includes a first resistor, a second resistor, and a third resistor, wherein a first end of the first resistor is a first end of the detection unit, a second end of the first resistor is connected to a first end of the second resistor, a common point of the second end of the second resistor and the first end of the third resistor is a second end of the detection unit, and a second end of the third resistor is a third end of the detection unit.
6. An air conditioner characterized by comprising the direct current motor protection circuit according to any one of claims 1 to 5, further comprising:
the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the four-way valve is used for controlling the flow direction of refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;
the direct current motor is used for driving the fan to rotate;
an indoor environment temperature sensor for detecting an indoor environment temperature;
and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021903367.1U CN214013859U (en) | 2020-09-03 | 2020-09-03 | Direct current motor protection circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021903367.1U CN214013859U (en) | 2020-09-03 | 2020-09-03 | Direct current motor protection circuit and air conditioner |
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| CN214013859U true CN214013859U (en) | 2021-08-20 |
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| CN202021903367.1U Active CN214013859U (en) | 2020-09-03 | 2020-09-03 | Direct current motor protection circuit and air conditioner |
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