CN113483407B - Control method, device and system of PTC electric heater and air conditioner - Google Patents
Control method, device and system of PTC electric heater and air conditioner Download PDFInfo
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- CN113483407B CN113483407B CN202110580323.2A CN202110580323A CN113483407B CN 113483407 B CN113483407 B CN 113483407B CN 202110580323 A CN202110580323 A CN 202110580323A CN 113483407 B CN113483407 B CN 113483407B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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Abstract
The invention discloses a control method, a control device and a control system of a PTC electric heater and an air conditioner, wherein the control method of the PTC electric heater comprises the steps of obtaining the running current value of the PTC electric heater; determining the operation state of the PTC electric heater according to the operation current value; an electric heating protection strategy for the PTC electric heater is executed according to the operation state. According to the control method of the PTC electric heater, a temperature controller and a fuse are replaced by a mode of detecting the running current value, the detection reliability is improved, and the hardware cost is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioner adjusting equipment, in particular to a control method of a Positive Temperature Coefficient (PTC) electric heater, a control device of the PTC electric heater, a PTC electric heating system and an air conditioner.
Background
In order to improve the heating effect of the air conditioner in winter, the air conditioning unit can add auxiliary electric heating to the indoor unit so as to improve the comfort of users. At present, ceramic PTC is generally selected as a material for auxiliary electric heating, and the electric heating temperature is detected in a heat radiation mode through a fuse and a temperature controller.
In the related art, the mode of detecting the temperature of electric heating by adopting the fuse and the temperature controller has certain time delay and certain hardware cost. And fuse and temperature controller generally install in the working of plastics of electric heating's one end, produce the difference of line assembly, product, installation difference in the reality and can cause to detect temperature error great to also great to electric heating control accuracy's influence in the actual test debugging process.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one of the objectives of the present invention is to provide a control method for a PTC electric heater, which improves the reliability of electric heating control and reduces the hardware cost.
The second purpose of the present invention is to provide a control device for a PTC electric heater.
The invention also aims to provide a PTC electric heating system.
The fourth objective of the present invention is to provide an air conditioner.
In order to achieve the above object, a control method of a PTC electric heater according to an embodiment of a first aspect of the present invention includes: acquiring the running current value of the PTC electric heater; determining the operation state of the PTC electric heater according to the operation current value; and executing an electric heating protection strategy for the PTC electric heater according to the operation state.
According to the control method of the PTC electric heater, the operation current value of the PTC electric heater is obtained, the operation state of the PTC electric heater is determined according to the operation current value, the electric heating protection strategy of the PTC electric heater is executed according to the operation state, namely the working state of the air conditioner PTC electric heater is judged by detecting the operation current value of the air conditioner PTC electric heater so as to adopt on-off control or prompt protection.
In some embodiments of the present invention, the determining the operation state of the PTC electric heater according to the operation current value includes: the operation current value is greater than or equal to a first current threshold value and less than or equal to a second current threshold value, and the PTC electric heater is determined to be in a normal operation state, wherein the second current threshold value is the current value when the PTC electric heater operates at a lower limit working temperature, and the first current threshold value is the current value when the PTC electric heater operates at a Curie temperature; or, the operation current value is smaller than a third current threshold and larger than a fourth current threshold, and the PTC electric heater is determined to be in a state of tending to deteriorate, wherein the third current threshold is smaller than the first current threshold, and the fourth current threshold is larger than the current value when the PTC electric heater operates at the upper limit operating temperature; or, the operation current value is smaller than the fourth current threshold value, and the PTC electric heater is determined to be in a fault operation state.
In some embodiments of the present invention, the performing an electric heating protection strategy for the PTC electric heater according to the operation state comprises: a first determination step of determining that the PTC electric heater is in a state tending to deteriorate; a time length recording step of recording a first duration time for which the PTC electric heater is in the deterioration tendency state; and a pause control step of determining that the duration is longer than a first preset duration and controlling the PTC electric heater to pause heating. A restarting step of controlling the PTC electric heater to be electrified and started again after a second preset time; a second determination step of determining that the PTC electric heater is still in a state tending to deteriorate; repeating the time length recording step, the pause control step, the restarting step and the second determining step, and recording the number of repetitions; and controlling the PTC electric heater to stop running and giving an electric heating fault alarm when the repetition times reach a preset number.
In some embodiments of the present invention, the performing an electrical heating protection strategy for the PTC electrical heater according to the operating condition comprises: determining that the PTC electric heater is in a fault operating state; recording a second duration of time that the PTC electric heater is in a fault operating state; and determining that the second duration time reaches a second preset duration time, controlling the PTC electric heater to stop running, and performing electric heating fault alarm.
In some embodiments of the present invention, the performing an electric heating protection strategy for the PTC electric heater according to the operation state comprises: and determining that the PTC electric heater is in a normal operation state, and controlling the PTC electric heater to continue to operate normally.
In order to achieve the above object, a control device for a PTC electric heater according to an embodiment of a second aspect of the present invention includes: the acquisition module is used for acquiring the running current value of the PTC electric heater; the determining module is used for determining the operation state of the PTC electric heater according to the operation current value; and the execution module is used for executing an electric heating protection strategy for the PTC electric heater according to the running state.
According to the control device of the PTC electric heater, the acquisition module acquires the running current value of the PTC electric heater of the air conditioner, the determination module determines the running state of the PTC electric heater according to the running current value, and the execution module executes the electric heating protection strategy of the PTC electric heater according to the running state, so that a temperature controller and a fuse of the PTC electric heater of the air conditioner are omitted, the cost is reduced, and the temperature and the running state of the PTC electric heater of the air conditioner are accurately and timely judged.
In order to achieve the above object, a PTC electric heating system according to an embodiment of the third aspect of the present invention includes: the PTC electric heater is connected with a power supply; the current collector is connected with the PTC electric heater in series and is used for collecting the running current value of the PTC electric heater; the switch assembly is used for controlling the connection state of the PTC electric heater and the power supply; and the control device is connected with the current collector and the switch assembly and is used for executing the control method of the air conditioner PTC electric heater.
According to the PTC electric heating system disclosed by the embodiment of the invention, the control method of the PTC electric heater disclosed by the embodiment of the first aspect is implemented, the current collector collects the running current value of the PTC electric heater, and the control device controls the switch assembly to be switched on and off according to the running state of the PTC electric heater so as to implement the electric heating protection strategy for the PTC electric heater.
In some embodiments of the present invention, the PTC electric heater includes a first PTC heating unit, a first end of the first PTC heating unit is connected to a negative end of the power supply, a second end of the PTC electric heater is connected to a first end of the current collector, a second end of the current collector is connected to a positive end of the power supply, and the switch assembly is disposed between the current collector and the positive end of the power supply.
In some embodiments of the present invention, the power supply includes a first phase power supply terminal, a second phase power supply terminal and a third phase power supply terminal; the PTC electric heater comprises a first PTC heating unit, a second PTC heating unit and a third PTC heating unit, wherein the first end of the first PTC heating unit is connected with the first phase power supply end, and the second end of the first PTC heating unit is connected with the first end of the second PTC heating unit and the first end of the third PTC heating unit; the current collector comprises a first current collecting unit and a second current collecting unit, wherein the first end of the first current collecting unit is connected with the second end of the second PTC heating unit, the second end of the first current collecting unit is connected with the second phase power supply end, the first end of the second current collecting unit is connected with the second end of the third PTC heating unit, and the second end of the second current collecting unit is connected with the third phase power supply end; the switch assembly comprises a first switch and a second switch, the first switch is arranged between the second end of the first current acquisition unit and the second phase power supply end, and the second switch is arranged between the second end of the second current acquisition unit and the third phase power supply end.
In order to achieve the above object, an embodiment of a fourth aspect of the present invention provides an air conditioner, including: a refrigerant circulation system; the PTC electrical heating system for an air conditioner according to the third aspect of the embodiment above; and the controller is used for controlling the refrigerant circulation system and the air conditioner PTC electric heating system according to the indoor air conditioning requirement.
According to the air conditioner provided by the embodiment of the invention, when the air conditioner needs to operate in a heating mode, the controller controls the refrigerant circulation system and the air conditioner PTC electric heating system to operate according to the indoor air conditioning requirement, and the working state of the air conditioner PTC electric heater is judged according to the detected operating current value of the air conditioner PTC electric heater by executing the control method of the air conditioner PTC electric heater disclosed by the embodiment of the first aspect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a control method of a PTC electric heater according to one embodiment of the present invention;
FIG. 2 is a schematic representation of the resistance versus temperature curve for an electrical PTC heater according to one embodiment of the invention;
fig. 3 is a flowchart of a control method of a PTC electric heater according to another embodiment of the present invention;
fig. 4 is a flowchart of a control method of a PTC electric heater according to still another embodiment of the present invention;
fig. 5 is a flowchart of a control method of a PTC electric heater according to still another embodiment of the present invention;
fig. 6 is a flowchart of a control method of a PTC electric heater according to still another embodiment of the present invention;
fig. 7 is a block diagram of a control device of a PTC electric heater according to an embodiment of the present invention;
fig. 8 is a block diagram of a PTC electrical heating system according to one embodiment of the present invention;
fig. 9 is a schematic view of a PTC electrical heating system according to another embodiment of the present invention;
fig. 10 is a block diagram of an air conditioner according to an embodiment of the present invention.
Reference numerals are as follows:
an air conditioner 1000;
a PTC electric heating system 10, a refrigerant circulation system 20, a controller 30;
PTC electric heater 11, current collector 12, switch assembly 13, control device 14;
a first PTC heating unit 111, a second PTC heating unit 112, a third PTC heating unit 113, a first current collecting unit 121, a second current collecting unit 122,
A first phase power supply end U, a second phase power supply end V, a third phase power supply end W, a first switch K1 and a second switch K2;
a control device 100 of the PTC electric heater of the air conditioner;
the device comprises an acquisition module 1, a determination module 2 and an execution module 3.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In some embodiments of the present invention, the auxiliary electric heater of the air conditioner is generally made of ceramic PTC, which has the characteristics of low temperature and constant temperature, surface insulation, no open fire, difficult combustion, safety and reliability, and the electrical heating resistance of the ceramic PTC can be kept at a certain value as the temperature is continuously increased.
In order to solve the problems of time delay, inaccurate temperature detection and high hardware cost when a temperature controller and a fuse are adopted to detect the temperature of the PTC electric heater, the embodiment of the invention provides a control method of the PTC electric heater and an air conditioner adopting the method.
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.
The air conditioner performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. Wherein the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a 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 high-temperature and high-pressure liquid-phase refrigerant 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 refrigerating effect by heat exchange 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.
An air conditioner according to some embodiments of the present application includes an air conditioner indoor unit installed in an indoor space. The indoor unit, i.e., the indoor unit, is connected to an outdoor unit, i.e., the outdoor unit, installed in an outdoor space through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and the like for a refrigeration cycle, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
A control method of the PTC electric heater according to an embodiment of the present invention is described below with reference to fig. 1 to 5. It should be noted that the step numbers in the present application, such as S1, S2, S3, etc., are only for convenience of describing the present solution, and are not to be construed as limiting the order of the steps. That is, the execution order of, for example, steps S1, S2, S3, etc. may be specifically determined according to actual requirements, and is not limited to the control in the order of steps in the following embodiments.
In some embodiments of the present invention, as shown in fig. 1, a flowchart of a control method of a PTC electric heater according to one embodiment of the present invention is provided, wherein the control method of the PTC electric heater at least includes steps S1-S3, which are described as follows.
And S1, acquiring the operation current value of the PTC electric heater.
In some embodiments of the present invention, the operating current of the PTC electric heater increases and then decreases as the operating time increases, and after a certain period of operation, the operating current tends to stabilize. The current collecting device can be connected with the PTC electric heater to collect the operation current value of the PTC electric heater, for example, a current transformer or a Hall sensor connected in series with an electric heating power supply is arranged to detect the operation current value of the PTC electric heater and transmit the detected operation current value of the PTC electric heater to the control module of the air conditioner.
And S2, determining the operation state of the PTC electric heater according to the operation current value.
In some embodiments of the invention, as shown in fig. 2, a diagram of resistance versus temperature curves for an electric PTC heater according to one embodiment of the invention is shown, wherein the horizontal axis T represents time and the vertical axis R represents resistance. Specifically, T25 in the horizontal axis represents that the standard room temperature is 25 ℃, R25 in the corresponding vertical axis represents the resistance of the PTC electric heater at the standard room temperature, Tmin in the horizontal axis represents the minimum temperature at which the PTC electric heater operates, i.e., the temperature at which the PTC electric heater exhibits the minimum resistance during normal operation, i.e., the lower limit operating temperature, and Rmin in the corresponding vertical axis represents the minimum resistance at which the PTC electric heater operates, i.e., the minimum resistance that the PTC electric heater can exhibit during normal operation. Tc in the horizontal axis represents curie temperature and also a starting point of phase transition of the PTC semi-conductor, which is generally RTc =2 Rmin corresponding to a temperature point corresponding to twice the minimum resistance value Rmin when the PTC electric heater is in normal operation, and Rc in the vertical axis represents switching resistance, i.e., resistance corresponding to curie point temperature. Tp in the horizontal axis represents the maximum operating temperature of the PTC electric heater, i.e., the upper limit operating temperature in the operating range, Rp in the vertical axis represents the maximum operating resistance of the PTC electric heater, i.e., the resistance corresponding to the upper limit operating temperature, Tmax in the horizontal axis represents the maximum temperature of the PTC electric heater, i.e., the maximum temperature that can be reached by the elements of the PTC electric heater, and Rmax in the vertical axis represents the maximum resistance of the PTC electric heater, i.e., the resistance at which the elements of the PTC electric heater reach the maximum temperature, where the current value at which the PTC electric heater operates at the maximum temperature that can be reached Tmax is denoted as Imax.
According to the R-T curve of the PTC electric heater, the resistance value of the PTC electric heater is reduced along with the increase of the temperature between T25 and Tmin, and when the temperature is Tmin, the resistance value reaches the minimum resistance value (Rmin) when the PTC electric heater normally operates; the resistance value of the PTC electric heater increases along with the increase of the temperature between the temperature Rmin-Tc and increases in a nonlinear way; the logarithm of the resistance value of the PTC electric heater increases approximately linearly with the increase of the temperature between the temperature Tc and Tmax, is maximum at the point Tmax, and the operation current value of the PTC electric heater is minimum when the resistance value reaches the maximum value. Therefore, the resistance change condition of the PTC electric heater can be reflected according to the running current value of the PTC electric heater, and the resistance change of the PTC electric heater can reflect the energy for assisting electric heating, so that the running state of the PTC electric heater can be judged based on the resistance change characteristic of the PTC electric heater, namely, the running state of the PTC electric heater can be determined according to the running current value of the PTC electric heater.
In an embodiment, the operating states of the PTC electric heater may include a normal operating state, a deterioration prone state, and a fault state. For example, in the normal operation state, the temperature of the PTC electric heater is between Tmin-Tc as shown in fig. 2, after the temperature of the PTC electric heater is higher than Tc, the performance of the PTC electric heater gradually deteriorates, i.e., is in a state tending to deteriorate, and as the temperature of the PTC electric heater increases, the temperature exceeds Tp, the PTC electric heater is internally short-circuited, i.e., enters a destruction state, and the PTC electric heater malfunctions.
And S3, executing an electric heating protection strategy for the PTC electric heater according to the operation state.
In the embodiment of the invention, different electric heating protection strategies can be set aiming at different operation states of the PTC electric heater, so that the PTC electric heater is prevented from being damaged under the condition of achieving normal auxiliary heating.
For example, when it is determined that the PTC electric heater is in the normal operation state, the PTC electric heater is controlled to continue the normal operation to perform the auxiliary electric heating. Or when the PTC electric heater is determined to be in a state of tending to deteriorate, the work of monitoring the running time of the PTC electric heater, controlling the PTC electric heater to restart and the like is carried out. Or when the PTC electric heater is determined to be in a fault operation state, controlling the PTC electric heater to stop operating and carrying out electric heating fault alarm.
The control method of the PTC electric heater according to the above embodiment of the present invention may be applied to an indoor unit or an outdoor unit of an air conditioner or an independent PTC electric heating device, and the use form of the PTC electric heater is not particularly limited herein.
According to the control method of the PTC electric heater, the operation current value of the PTC electric heater is obtained, the operation state of the PTC electric heater is determined according to the operation current value, the electric heating protection strategy of the PTC electric heater is executed according to the operation state, namely the working state of the air conditioner PTC electric heater is judged by detecting the operation current value of the air conditioner PTC electric heater so as to adopt on-off control or prompt protection.
In some embodiments of the present invention, when determining the operation state of the PTC electric heater according to the operation current value of the PTC electric heater, if the operation current value is greater than or equal to a first current threshold value and less than or equal to a second current threshold value, the PTC electric heater is determined to be in the normal operation state, wherein the second current threshold value is a current value when the PTC electric heater operates at a lower limit operating temperature Tmin, the first current threshold value is a current value when the PTC electric heater operates at a curie temperature Tc, the operation current value is denoted as I, the first current threshold value is denoted as Ip, the second current threshold value is denoted as Ic, that is, when Ic ≦ I ≦ Imin, the PTC electric heater is determined to be in the normal operation state.
Or if the operation current value is smaller than the third current threshold and larger than the fourth current threshold, determining that the PTC electric heater is in a state of tending to deteriorate, and recording the third current threshold as I1 and the fourth current threshold as I2, namely I2 < I1. As can be seen from fig. 2, the temperature of the PTC electric heater corresponding to the third current threshold I1 is denoted as T1, the resistance of the corresponding PTC electric heater is denoted as R1, the temperature of the PTC electric heater corresponding to the four current threshold I2 is denoted as T2, and the resistance of the corresponding PTC electric heater is denoted as R2. Wherein the third current threshold value I1 is smaller than the first current threshold value Ip, and the fourth current threshold value I2 is larger than the current value Ip when the PTC electric heater is operated at the upper limit operating temperature Tp. If the temperature of the PTC electric heater continues to rise and the temperature is higher than the maximum temperature Tp, the resistance gradually changes slowly and even becomes smaller with the temperature, the operating current value gradually increases, and the fourth current threshold value is equal to I2, and the temperature T2 corresponding to the fourth current threshold value I2 is set to be lower than the upper limit operating temperature Tp, so that the occurrence of misjudgment is prevented, because as shown in fig. 2. When I2 < I1, the resistance of the PTC electric heater increases linearly with increasing temperature and the operating current decreases linearly, but it is also acceptable to determine that the PTC electric heater is in a state tending to deteriorate.
Still alternatively, if the operating current value is less than the fourth current threshold value I2, it is determined that the PTC electric heater is in the failure operating state. In the embodiment, when the operation current value I is smaller than the fourth current threshold value I2, i.e. I < I2, and when I < I2, the corresponding resistance of the PTC electric heater is large and the operating temperature is high, the PTC electric heater is prone to malfunction due to the high temperature, and the characteristics of the PTC electric heater will change, and it is determined that the PTC electric heater is in the faulty operation state.
In the above, the third current threshold I1 and the fourth current threshold I2 are set, that is, the current return difference is set between the current value corresponding to the curie temperature and the current value corresponding to the upper limit operating temperature Tp, so that the stability and accuracy of detection can be improved.
Further, in some embodiments of the present invention, as shown in fig. 3, which is a flowchart of a control method of a PTC electric heater according to another embodiment of the present invention, wherein an electric heating protection strategy for the PTC electric heater is performed according to an operation state, i.e., the above step S3 at least includes steps S31-S37, as follows.
S31, a first determination step of determining that the PTC electric heater is in a state tending to deteriorate.
In an embodiment, the operating current value I is less than the third current threshold value I1 and greater than the fourth current threshold value I2, the PTC electric heater gradually tends to be constant as the temperature increases, but it is also acceptable to determine that the PTC electric heater is in a state of tending to deteriorate.
S32, a time length recording step of recording a first duration of time that the PTC electric heater is in a state tending to deteriorate. When the operation current value I of the PTC electric heater meets the condition that I2 < I1, the operation time of the PTC electric heater in the state is recorded.
And S33, determining that the duration is longer than the first preset duration, and controlling the PTC electric heater to pause heating. If the operation time of the PTC electric heater in the deterioration state exceeds the first preset time, the control device controls the switch component such as the electric heating relay to be switched off, and the PTC electric heater stops heating.
And S34, controlling the PTC electric heater to be powered on again after a second preset time period. And after the PTC electric heater is heated for 3min, the control device controls the switch assembly to be switched on, and the PTC electric heater is electrified and started again.
S35, a second determination step of determining that the PTC electric heater is still in a state tending to deteriorate. And after the power is supplied again and the PTC electric heater is started, the operation current value of the PTC electric heater is detected again, and the PTC electric heater is still in a state of tending to deteriorate according to the operation current value.
S36, repeating the time length recording step, the pause control step, the restart step and the second determination step, and recording the number of repetitions. The method comprises a time length recording step of recording a first time length of the PTC electric heater in a state tending to deteriorate again, a pause control step of determining that the time length is longer than a first preset time length, controlling the PTC electric heater to pause heating, and a restarting step of controlling the PTC electric heater to be electrified and started again after a second preset time length.
And S37, controlling the PTC electric heater to stop running and giving an electric heating fault alarm when the repetition times reach the preset times.
In the embodiment, the preset times are set to be three times, and when the power-on restarting times reach three times, the control module controls the PTC electric heater to stop running and carries out alarm prompting.
Further, in some embodiments of the present invention, as shown in fig. 4, which is a flowchart of a control method of a PTC electric heater according to still another embodiment of the present invention, wherein an electric heating protection strategy for the PTC electric heater is performed according to an operation state, i.e., the above step S3 further includes steps S38-S310, as follows.
And S38, determining that the PTC electric heater is in a fault operation state.
In an embodiment, when the operating current value I is less than the fourth current threshold value I2, the PTC electric heater enters a failure state, i.e., the PTC electric heater is about to fail, and it is determined that the PTC electric heater is in a failure operating state.
And S39, recording the second duration of the PTC electric heater in the fault operation state.
In an embodiment, when the PTC electric heater is in the fault operation state, the operation current value I of the PTC electric heater may not reach the current value when the PTC electric heater operates at the maximum temperature Tmax and is recorded as Imax, and then a fault may not occur immediately, and the second duration time when the PTC electric heater is in the fault operation state is recorded.
And S310, determining that the second duration reaches a second preset duration, controlling the PTC electric heater to stop running, and giving an electric heating fault alarm.
And when the PTC electric heater is determined to be in a fault operation state and the continuous operation time reaches the second preset time, controlling the PTC electric heater to stop operating and carrying out electric heating fault alarm.
In some embodiments of the present invention, as shown in fig. 5, there is a flowchart of a control method of an air conditioner PTC electric heater according to another embodiment of the present invention, wherein an electric heating protection strategy for the PTC electric heater is performed according to an operation state, that is, the above step S3 further includes step S311, which is as follows.
And S311, determining that the PTC electric heater is in a normal operation state, and controlling the PTC electric heater to continue to operate normally. And when the operation current value I is greater than or equal to the first current threshold value Ip and less than or equal to the second current threshold value Ic, determining that the PTC electric heater is in a normal operation state.
In some embodiments of the present invention, as shown in fig. 6, a flowchart of a control method of a PTC electric heater according to still another embodiment of the present invention is provided, wherein the control method of the PTC electric heater includes steps S101-S114, as follows.
S101, start.
S102, detecting the operation current value I of the PTC electric heater.
S103, judging the operation current value I.
And S104, when determining that the Ic is less than or equal to I and less than or equal to Imin, determining that the PTC electric heater is in a normal operation state.
And S105, when I < I2 is determined, judging whether the detection time is greater than N, if the judgment result is yes, executing the step S106, and if the judgment result is no, returning to the step S105.
And S106, the PTC electric heater is in a fault operation state.
And S107, ending.
S108, when I2 < I1 is determined, whether the detection time is greater than M is judged, if yes, step S109 is executed, and if no, the step S108 is returned to.
S109, the PTC electric heater is in a deterioration tendency state.
And S110, powering up again after three minutes.
And S111, detecting the operation current value I of the PTC electric heater.
And S112, judging whether the condition that the power-on is repeated for three times, wherein I2 is more than I < I1, the detection time is more than M, if the judgment result is yes, executing the step S113, and if the judgment result is no, returning to execute the step S103.
And S113, alarming the electric heating fault.
And S114, ending.
According to the control method of the PTC electric heater, the operation current value of the PTC electric heater is obtained, the operation state of the PTC electric heater is determined according to the operation current value, and the electric heating protection strategy of the PTC electric heater is executed according to the operation state.
In some embodiments of the present invention, as shown in fig. 7, there is a block diagram of a control apparatus of a PTC electric heater according to an embodiment of the present invention, wherein the control apparatus 100 of the PTC electric heater includes an acquisition module 1, a determination module 2 and an execution module 3.
The acquisition module 1 is used for acquiring the operation current value I of the PTC electric heater, wherein the acquisition module can comprise a current collector, a current transformer, a Hall sensor and the like and is used for acquiring the operation current value I of the PTC electric heater of the air conditioner.
And the determining module 2 is used for determining the operation state of the PTC electric heater according to the operation current value I, wherein the operation state of the PTC electric heater can be determined by setting a judgment condition. For example, when the operating current value I is greater than or equal to the first current threshold value Ip and less than or equal to the second current threshold value Ic, it is determined that the PTC electric heater is in the normal operation state, or when the operating current value I is less than the third current threshold value I1 and greater than the fourth current threshold value I2, it is determined that the PTC electric heater is in the deterioration tendency state, or when the operating current value I is less than the fourth current threshold value I2, it is determined that the PTC electric heater is in the fault operation state.
And the execution module 3 is used for executing an electric heating protection strategy for the PTC electric heater according to the running state.
In the embodiment, when the PTC electric heater is determined to be in the normal operation state, the PTC electric heater is controlled to continue to operate normally, or when the PTC electric heater is determined to be in the deterioration trend state, the work of monitoring the operation of the PTC electric heater frequently and controlling the PTC electric heater to restart is carried out. Or when the PTC electric heater is determined to be in a fault operation state, controlling the PTC electric heater to stop operating and carrying out electric heating fault alarm.
According to the control device 100 of the PTC electric heater, the acquisition module 1 acquires the operation current value I of the PTC electric heater, the determination module 2 determines the operation state of the PTC electric heater according to the operation current value I, and the execution module 3 executes the electric heating protection strategy for the PTC electric heater according to the operation state, so that a temperature controller and a fuse of the air conditioner PTC electric heater are eliminated, the cost is reduced, and the temperature and the operation state of the air conditioner PTC electric heater are accurately and timely judged.
The PTC electrical heating system will be described with reference to fig. 8 and 9. Fig. 8 is a block diagram of a PTC electrical heating system in accordance with one embodiment of the present invention.
In some embodiments of the present invention, as shown in fig. 8, PTC electrical heating system 10 comprises PTC electrical heater 11, current collector 12, switch assembly 13, and control device 14.
The PTC electric heater 11 is connected to a power supply, and the power supply supplies power to the PTC electric heater 11. The power supply may include single-phase power or multi-phase power, among others.
For example, when the PTC electrical heating system 10 is a single-phase electrical heating system, as shown in fig. 8, the PTC electrical heater 11 includes a first PTC heating unit 111, a first end of the first PTC heating unit 111 is connected to a negative end, i.e., an N-end, of a power supply, a second end of the PTC electrical heater 11 is connected to a first end of a current collector 12, a second end of the current collector 12 is connected to a positive end, i.e., an L-end, of the power supply, and a switch element 13 is disposed between the current collector 12 and the positive end of the power supply.
The current collector 12 is connected in series with the PTC electric heater 11, and is used for collecting an operation current value of the PTC electric heater 11. Wherein, current collector 12 may be configured as a current transformer or a hall sensor, etc.
The switch assembly 13 is used for controlling the connection state of the PTC electric heater 11 with the power supply. The switch assembly 13 is turned on, the power supply supplies power to the PTC electric heater 11, and the PTC electric heater 11 operates.
The control device 14 is connected with the current collector 12 and the switch assembly 13, and is used for executing the control method of the PTC electric heater of the air conditioner according to any one of the above embodiments. An MCU (Micro Control Unit) in the Control module 14 can process the running current value of the PTC electric heater 11 collected by the current collector 12, and send a Control signal to Control the switching element 13 to be turned on or off, the Control module 14 is connected to a 12V power supply through the switching element 13, and the 12V power supply supplies power to the Control module 14. The control device 14 controls the operation of the PTC electric heater and controls the on-off of the switch assembly 13 according to the operation state of the PTC electric heater so as to execute an electric heating protection strategy for the PTC electric heater.
According to the PTC electric heating system 10 of the embodiment of the invention, the control method of the PTC electric heater of the embodiment of the first aspect is implemented, the current collector 12 collects the running current value of the PTC electric heater 11, and the control device 14 controls the switch assembly 13 to be switched on and off according to the running state of the PTC electric heater so as to implement the electric heating protection strategy for the PTC electric heater 11.
In some embodiments of the present invention, as shown in fig. 9, a schematic diagram of a PTC electrical heating system according to another embodiment of the present invention is shown, wherein the PTC electrical heating system 10 is a three-phase electrical heating, the power supply includes a first phase power supply terminal U, a second phase power supply terminal V and a third phase power supply terminal W, and the PTC electrical heater 11 includes a first PTC heating unit 111, a second PTC heating unit 112 and a third PTC heating unit 113.
A first end of the first PTC heating unit 111 is connected to the first phase power supply terminal U, and a second end of the first PTC heating unit 111 is connected to a first end of the second PTC heating unit 112 and a first end of the third PTC heating unit 113. The current collector 12 includes a first current collecting unit 121 and a second current collecting unit 122, a first end of the first current collecting unit 121 is connected to a second end of the second PTC heating unit 112, a second end of the first current collecting unit 121 is connected to a second phase power supply terminal V, a first end of the second current collecting unit 122 is connected to a second end of the third PTC heating unit 113, and a second end of the second current collecting unit 122 is connected to a third phase power supply terminal W. The switch assembly 13 includes a first switch K1 and a second switch K2, the first switch K1 is disposed between the second terminal of the first current collecting unit 121 and the second phase power terminal V, and the second switch K2 is disposed between the second terminal of the second current collecting unit 122 and the third phase power terminal W.
In some embodiments of the present invention, when the PTC electric heating system 10 is a three-phase electric heating system, the power supply is powered by the first phase power supply terminal U, the second phase power supply terminal V and the third phase power supply terminal W, the first PTC heating unit 111, the second PTC heating unit 112 and the third PTC heating unit 113 of the PTC electric heater 11, respectively, the first current collecting unit 121 collects the operating current value of the second PTC heating unit 112, the second current collecting unit 122 collects the operating current value of the third PTC heating unit 113, the MCU of the control module 14 determines the operating states of the second PTC heating unit 112 and the third PTC heating unit 113 according to the operating current values collected by the first current collecting unit 121 and the second current collecting unit 122, respectively, and controls the first switch K1 and the second switch K2 to be turned on and off according to the operating states of the second PTC heating unit 112 and the third PTC heating unit 113, thereby performing an electric heating protection strategy for the second and third PTC heating units 112 and 113. Meanwhile, when the PTC electric heater 11 operates, the first PTC heating unit 111 does not stop operating, ensuring that the PTC electric heating system 10 operates.
Fig. 10 is a block diagram of an air conditioner according to an embodiment of the present invention.
In some embodiments of the present invention, as shown in fig. 10, an air conditioner 1000 includes a refrigerant circulation system 20, a controller 30, and the air conditioner PTC electric heating system 10 of the above third aspect embodiment.
The controller 30 is used for controlling the refrigerant circulation system 20 and the PTC electric heating system 10 according to the indoor air conditioning requirement.
According to the air conditioner 1000 of the embodiment of the present invention, when the air conditioner 1000 needs to operate in the heating mode, the controller 30 controls the operation of the refrigerant circulation system 20 and the PTC electric heating system 10 of the air conditioner according to the indoor air conditioning needs, and by executing the control method of the PTC electric heater of the first aspect embodiment, the operating state of the PTC electric heater is determined according to the detected operating current value of the PTC electric heater, compared with the case of using a temperature controller and a fuse, the hardware cost is low, and the temperature and the operating state of the PTC electric heater can be timely and accurately determined.
Other configurations and operations of the air conditioner 1000 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A method of controlling a PTC electric heater comprising:
acquiring the running current value of the PTC electric heater;
determining the operation state of the PTC electric heater according to the operation current value;
executing an electric heating protection strategy for the PTC electric heater according to the running state;
wherein the executing of the electric heating protection strategy for the PTC electric heater according to the operation state comprises:
the operation current value is greater than or equal to a first current threshold value and less than or equal to a second current threshold value, and the PTC electric heater is determined to be in a normal operation state, wherein the second current threshold value is the current value when the PTC electric heater operates at a lower limit working temperature, and the first current threshold value is the current value when the PTC electric heater operates at a Curie temperature;
or, the operation current value is smaller than a third current threshold and larger than a fourth current threshold, and the PTC electric heater is determined to be in a state of tending to deteriorate, wherein the third current threshold is smaller than the first current threshold, and the fourth current threshold is larger than the current value when the PTC electric heater operates at the upper limit operating temperature;
or, the operation current value is smaller than the fourth current threshold value, and the PTC electric heater is determined to be in a fault operation state;
and the executing of the electric heating protection strategy for the PTC electric heater according to the operating state further comprises:
a first determination step of determining that the PTC electric heater is in a state tending to deteriorate;
a time length recording step of recording a first duration time for which the PTC electric heater is in the state of tending to deteriorate;
a pause control step of determining that the duration is longer than a first preset duration and controlling the PTC electric heater to pause heating;
a restarting step of controlling the PTC electric heater to be electrified and started again after a second preset time;
a second determination step of determining that the PTC electric heater is still in a state tending to deteriorate;
repeating the time length recording step, the pause control step, the restarting step and the second determining step, and recording the number of repetitions;
and controlling the PTC electric heater to stop running and giving an electric heating fault alarm when the repetition times reach a preset number.
2. The method of controlling a PTC electric heater according to claim 1, wherein the performing an electric heating protection strategy for the PTC electric heater according to the operating state comprises:
determining that the PTC electric heater is in a fault operating state;
recording a second duration of time that the PTC electric heater is in a fault operating state;
and determining that the second duration time reaches a second preset duration time, controlling the PTC electric heater to stop running, and performing electric heating fault alarm.
3. The method of controlling a PTC electric heater according to claim 2, wherein the performing an electric heating protection strategy for the PTC electric heater according to the operating state comprises:
and determining that the PTC electric heater is in a normal operation state, and controlling the PTC electric heater to continue to operate normally.
4. A control device for a PTC electric heater comprising:
the acquisition module is used for acquiring the running current value of the PTC electric heater;
the determining module is used for determining the operation state of the PTC electric heater according to the operation current value;
wherein the determining module is specifically configured to: the operation current value is greater than or equal to a first current threshold value and less than or equal to a second current threshold value, and the PTC electric heater is determined to be in a normal operation state, wherein the second current threshold value is the current value when the PTC electric heater operates at a lower limit working temperature, and the first current threshold value is the current value when the PTC electric heater operates at a Curie temperature; or, the operation current value is smaller than a third current threshold and larger than a fourth current threshold, and the PTC electric heater is determined to be in a state of tending to deteriorate, wherein the third current threshold is smaller than the first current threshold, and the fourth current threshold is larger than the current value when the PTC electric heater operates at the upper limit operating temperature; or, the operation current value is smaller than the fourth current threshold value, and the PTC electric heater is determined to be in a fault operation state;
the execution module is used for executing an electric heating protection strategy for the PTC electric heater according to the running state;
the execution module is specifically configured to: when the PTC electric heater is determined to be in a first determining step of tending to a deterioration state, a time length recording step of recording a first duration time of the PTC electric heater in the tending to the deterioration state, when the duration time is determined to be greater than a first preset time length, a pause control step of controlling the PTC electric heater to pause heating, after a second preset time length, a restarting step of controlling the PTC electric heater to be powered on and started again, when the PTC electric heater is determined to be still in a second determining step of tending to the deterioration state, the time length recording step, the pause control step, the restarting step and the second determining step are repeated, the repetition times are recorded, and when the repetition times reach the preset times, the PTC electric heater is controlled to stop running and carry out electric heating fault alarm.
5. A PTC electrical heating system, comprising:
the PTC electric heater is connected with a power supply;
the current collector is connected with the PTC electric heater in series and is used for collecting the running current value of the PTC electric heater;
the switch assembly is used for controlling the connection state of the PTC electric heater and the power supply;
a control device connected with the current collector and the switch assembly for performing the control method of the PTC electric heater of any one of claims 1-3.
6. PTC electrical heating system according to claim 5,
the PTC electric heater comprises a first PTC heating unit, the first end of the first PTC heating unit is connected with the negative end of the power supply, the second end of the PTC electric heater is connected with the first end of the current collector, the second end of the current collector is connected with the positive end of the power supply, and the switch assembly is arranged between the current collector and the positive end of the power supply.
7. PTC electrical heating system according to claim 5,
the power supply comprises a first phase power supply end, a second phase power supply end and a third phase power supply end;
the PTC electric heater comprises a first PTC heating unit, a second PTC heating unit and a third PTC heating unit, wherein the first end of the first PTC heating unit is connected with the first phase power supply end, and the second end of the first PTC heating unit is connected with the first end of the second PTC heating unit and the first end of the third PTC heating unit;
the current collector comprises a first current collecting unit and a second current collecting unit, wherein the first end of the first current collecting unit is connected with the second end of the second PTC heating unit, the second end of the first current collecting unit is connected with the second phase power supply end, the first end of the second current collecting unit is connected with the second end of the third PTC heating unit, and the second end of the second current collecting unit is connected with the third phase power supply end;
the switch assembly comprises a first switch and a second switch, the first switch is arranged between the second end of the first current acquisition unit and the second phase power supply end, and the second switch is arranged between the second end of the second current acquisition unit and the third phase power supply end.
8. An air conditioner, comprising:
a refrigerant circulation system;
a PTC electrical heating system according to any one of claims 5-7;
and the controller is used for controlling the refrigerant circulating system and the PTC electric heating system according to the indoor air regulation requirement.
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| CN2472260Y (en) * | 2000-09-07 | 2002-01-16 | 杭州高特电子设备有限公司 | Adjustable electronic load |
| CN201004191Y (en) * | 2007-01-06 | 2008-01-09 | 珠海格力电器股份有限公司 | Auxiliary heat circuit for air conditioner |
| JP2008249170A (en) * | 2007-03-29 | 2008-10-16 | Matsushita Electric Ind Co Ltd | Cooling device for heating element storing box |
| JP5875278B2 (en) * | 2011-08-04 | 2016-03-02 | 三菱重工業株式会社 | HEATER CONTROL DEVICE, ITS CONTROL METHOD, AND ITS PROGRAM |
| CN102298406A (en) * | 2011-08-24 | 2011-12-28 | 张克勇 | Electric heater and control device thereof |
| CN203731704U (en) * | 2014-01-13 | 2014-07-23 | 芜湖美的厨卫电器制造有限公司 | Dry-burning-prevention device and electric water heater |
| CN104793094B (en) * | 2014-01-22 | 2018-05-18 | 珠海格力电器股份有限公司 | Detection circuit and method, electric heating system for electric heater |
| CN105357780B (en) * | 2015-12-17 | 2018-10-26 | 珠海格力电器股份有限公司 | A kind of PTC electric heater dry combustion method guard method and device and household electrical appliance |
| CN106440278B (en) * | 2016-10-21 | 2019-02-26 | 珠海格力电器股份有限公司 | Air-conditioning and air conditioner electric heating protection method, device |
| CN106895619A (en) * | 2016-11-30 | 2017-06-27 | 美的集团武汉制冷设备有限公司 | The deicing control method of air-conditioner and chassis of outdoor unit of air conditioner |
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Address after: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Applicant after: Hisense Air Conditioning Co.,Ltd. Address before: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Applicant before: HISENSE (SHANDONG) AIR-CONDITIONING Co.,Ltd. |
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