CN110701762B - Over-temperature protection circuit of air conditioner, air conditioner and over-temperature protection method of air conditioner - Google Patents
Over-temperature protection circuit of air conditioner, air conditioner and over-temperature protection method of air conditioner Download PDFInfo
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- CN110701762B CN110701762B CN201911131005.7A CN201911131005A CN110701762B CN 110701762 B CN110701762 B CN 110701762B CN 201911131005 A CN201911131005 A CN 201911131005A CN 110701762 B CN110701762 B CN 110701762B
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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
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention discloses an over-temperature protection circuit of an air conditioner, the air conditioner and an over-temperature protection method of the air conditioner, wherein the over-temperature protection circuit comprises a first switch circuit, a second switch circuit, a third switch circuit, an auxiliary heat signal input end and a plurality of heat dissipation signal input ends; a plurality of controlled ends of the first switch circuit are correspondingly connected with a plurality of heat dissipation signal input ends, a power supply input end of the first switch circuit is connected with an alternating current live wire, a plurality of first power supply output ends of the first switch circuit are connected with the heat dissipation device, and a second power supply output end of the first switch circuit is connected with a controlled end of the second switch circuit; the signal input end of the second switch circuit is connected with the auxiliary heat signal input end, and the signal output end of the second switch circuit is connected with the controlled end of the third switch circuit; the power input end of the third switching circuit is connected with an alternating current live wire, and the power output end of the third switching circuit is connected with the auxiliary heating device. The technical scheme of the invention can avoid overhigh temperature caused by independently starting the auxiliary device of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an over-temperature protection circuit of an air conditioner, the air conditioner and an over-temperature protection method of the air conditioner.
Background
An electric auxiliary heating device is often arranged on the air conditioner unit to adjust the indoor temperature and achieve the purpose of rapid and powerful heating. Because the temperature is higher when the electric auxiliary heating device is started, if only the electric auxiliary heating device is started, the temperature of the air around the air conditioner can be continuously increased, and even a fire disaster can be caused. At present, in order to avoid the situation that the temperature of air around the air conditioner is too high due to the fact that an electric auxiliary heating device is started, the following modes are often adopted for over-temperature protection:
firstly, increase thermal fuse on the control circuit of the electric auxiliary heating device, when the air temperature around the air conditioner reaches the set temperature, the control fuse breaks off to make the electric auxiliary heating device stop working, thereby reduce the air temperature.
However, since the thermal fuse is an unrecoverable device, it is necessary to manually replace the thermal fuse after the thermal fuse is disconnected, which is inefficient in manually replacing the thermal fuse, and high in labor cost and hardware cost.
And secondly, a temperature sensor is arranged, the temperature of the air around the air conditioner is detected through the temperature sensor, and when the temperature of the air around the air conditioner is too high, the electric auxiliary heating device is controlled to be closed through system software, so that the air temperature is reduced.
However, the temperature sensor is prone to inaccurate detection; and the system software is used for controlling the on-off of the electric auxiliary heating device, and when the temperature detection is abnormal or the system software is abnormal, the electric auxiliary heating device cannot be reliably controlled to be turned off.
Disclosure of Invention
The invention provides an over-temperature protection circuit of an air conditioner, the air conditioner and an over-temperature protection method of the air conditioner, and aims to solve the problem that the air temperature around the air conditioner is too high due to the fact that only an auxiliary heating device of the air conditioner is started.
In order to achieve the above object, the present invention provides an over-temperature protection circuit of an air conditioner, which includes a first switch circuit, a second switch circuit, a third switch circuit, an auxiliary heat signal input terminal and a plurality of heat dissipation signal input terminals;
a plurality of controlled ends of the first switch circuit are connected with the plurality of radiating signal input ends in a one-to-one correspondence manner, a power supply input end of the first switch circuit is connected with an alternating current live wire, a plurality of first power supply output ends of the first switch circuit are all connected with an input end of a radiating device, and a second power supply output end of the first switch circuit is connected with a controlled end of the second switch circuit;
the signal input end of the second switch circuit is connected with the auxiliary heat signal input end, and the signal output end of the second switch circuit is connected with the controlled end of the third switch circuit;
and the power supply input end of the third switching circuit is connected with the alternating current live wire, and the power supply output end of the third switching circuit is connected with the input end of the auxiliary heating device.
Optionally, the plurality of heat dissipation signal input terminals include a first heat dissipation signal input terminal, a second heat dissipation signal input terminal, and a third heat dissipation signal input terminal, and the first switch circuit includes a first relay, a second relay, and a third relay;
a first end of the first relay is connected with the first heat dissipation signal input end, a second end of the first relay is connected with an alternating current zero line, a third end of the first relay is connected with an alternating current live wire, a fourth end of the first relay is connected with a third end of the second relay, and a fifth end of the first relay is connected with the input end of the heat dissipation device;
the first end of the second relay is connected with the second heat dissipation signal input end, the second end of the second relay is connected with the alternating current zero line, the fourth end of the second relay is connected with the third end of the third relay, and the fifth end of the second relay is connected with the input end of the heat dissipation device;
the first end of the third relay is connected with the third heat dissipation signal input end, the second end of the third relay is connected with the alternating current zero line, the fourth end of the third relay is connected with the controlled end of the second switch circuit, and the fifth end of the third relay is connected with the input end of the heat dissipation device.
Optionally, the second switching circuit comprises a fourth relay;
the first end of the fourth relay is connected with the fourth end of the third relay, the second end of the fourth relay is connected with the alternating current zero line, the third end of the fourth relay is connected with the auxiliary heating signal input end, and the fourth end of the fourth relay is connected with the controlled end of the third switch circuit.
Optionally, the third switching circuit comprises a contactor;
the first end of the contactor is connected with the fourth end of the fourth relay, and the second end of the contactor is connected with the alternating current zero line; the third end, the fifth end and the seventh end of the contactor are connected with the alternating current live wire; and the fourth end, the sixth end and the eighth end of the contactor are connected with the input end of the auxiliary heating device.
Optionally, the over-temperature protection circuit of the air conditioner further includes a first fuse element, a second fuse element, and a third fuse element;
the fourth end of the contactor is connected with the input end of the auxiliary heating device through the first fuse element; the sixth end of the contactor is connected with the input end of the auxiliary heating device through the second fuse element; and the eighth end of the contactor is connected with the input end of the auxiliary heating device through the third fuse element.
Optionally, the over-temperature protection circuit of the air conditioner further includes a temperature control switch;
the temperature control switch is connected in series between the signal output end of the second switch circuit and the controlled end of the third switch circuit.
In order to achieve the above object, the present invention further provides an air conditioner including the over-temperature protection circuit of the air conditioner as described in any one of the above.
In order to achieve the above object, the present invention further provides an over-temperature protection method for an air conditioner, which is applied to the air conditioner, wherein the air conditioner comprises an over-temperature protection circuit, a heat dissipation device and an auxiliary heat device of the air conditioner, and the over-temperature protection method for the air conditioner comprises the following steps:
judging whether any one of a plurality of heat dissipation signal input ends of an over-temperature protection circuit of the air conditioner receives a heat dissipation signal;
when one of the heat dissipation signal input ends receives a heat dissipation signal, the heat dissipation device is controlled to be started;
when the heat dissipation device is started, judging whether an auxiliary heat signal input end of an over-temperature protection circuit of the air conditioner receives an auxiliary heat signal;
and when the auxiliary heat signal input end receives an auxiliary heat signal, controlling the auxiliary heat device to be started.
Optionally, after the step of determining whether any heat dissipation signal input terminal of the multiple heat dissipation signal input terminals of the over-temperature protection circuit of the air conditioner receives the heat dissipation signal, the method further includes:
and when each heat dissipation signal input end in the plurality of heat dissipation signal input ends does not receive a heat dissipation signal, controlling the heat dissipation device and the auxiliary heat device to be closed.
Optionally, after the step of determining whether the auxiliary heat signal input end of the over-temperature protection circuit of the air conditioner receives the auxiliary heat signal when the heat dissipation device is turned on, the method further includes:
and controlling the auxiliary heating device to be closed when the auxiliary heating signal input end does not receive the auxiliary heating signal.
According to the technical scheme of the invention, when one controlled end of the first switch circuit receives a heat dissipation signal, the heat dissipation device of the air conditioner is started, and the second switch circuit is kept in a conducting state. During the conduction period of the second switch circuit, if an auxiliary heat signal is input, the auxiliary heat signal can be transmitted to the third switch circuit through the conducted second switch circuit so as to trigger the third switch circuit to be conducted, so that the alternating current power supply supplies power to the auxiliary heat device, and the auxiliary heat device of the regulator is started to heat; when any controlled end of the first switch circuit does not receive the heat dissipation signal, the heat dissipation device of the air conditioner is turned off, and the alternating current power supply outputs a control electric signal to the second switch circuit through the second power supply output end of the first switch circuit so as to control the second switch circuit to be switched from the on state to the off state. During the period that the second switch circuit is disconnected, the auxiliary heating device of the air conditioner is not turned on regardless of whether the auxiliary heating signal is input. So set up, can effectual solution because the auxiliary heating device of air conditioner opens and heat abstractor does not open, lead to the too high problem of indoor temperature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of an over-temperature protection circuit of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an over-temperature protection circuit of an air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating an over-temperature protection method of an air conditioner according to an embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a block diagram of an embodiment of an over-temperature protection circuit of an air conditioner according to the present invention.
Referring to fig. 1, the over-temperature protection circuit of the air conditioner includes: a first switch circuit 10, a second switch circuit 20, a third switch circuit 30, an auxiliary heat signal input terminal RH, and a plurality of heat dissipation signal input terminals S1 to Sn;
a plurality of controlled terminals of the first switch circuit 10 are connected to the plurality of heat dissipation signal input terminals S1-Sn in a one-to-one correspondence manner, a power input terminal of the first switch circuit 10 is connected to an alternating current (ac) power line L, a plurality of first power output terminals of the first switch circuit 10 are all connected to an input terminal of the heat dissipation device 40, and a second power output terminal of the first switch circuit 10 is connected to a controlled terminal of the second switch circuit 20; a signal input end of the second switch circuit 20 is connected with the auxiliary heating signal input end RH, and a signal output end of the second switch circuit 20 is connected with a controlled end of the third switch circuit 30; the power input end of the third switch circuit 30 is connected to the ac live wire L, and the power output end of the third switch circuit 30 is connected to the input end of the auxiliary heating device 50.
The first switch circuit 10 may be implemented by a circuit including a plurality of relays, or may be implemented by other circuits, which is not limited herein. The first switching circuit 10 has the following characteristics: when one of the controlled terminals of the first switch circuit 10 receives a heat dissipation signal, the power input terminal of the first switch circuit 10 is connected to the first power output terminal corresponding to the controlled terminal, and the heat dissipation device 40 is turned on and operates in a wind shield corresponding to the heat dissipation signal; when each controlled terminal of the first switch circuit 10 does not receive the heat dissipation signal, the power input terminal of the first switch circuit 10 is connected to the second power output terminal, and the first switch circuit 10 outputs the control electrical signal to the second switch circuit 20. Wherein, a plurality of heat dissipation signal input ends are used for the heat dissipation signal of input corresponding windscreen respectively, and at same moment, can not input the heat dissipation signal of two kinds and more than two kinds of different windscreen simultaneously to avoid the circuit logic confusion, thereby improve circuit's stability, reliability.
The second switch circuit 20 has two states of on and off, and may be implemented by a circuit composed of a single or a plurality of relays, or may be implemented by other circuits, which is not limited herein. The second switching circuit 20 has the following characteristics: when the controlled end of the second switch circuit 20 does not receive the control electrical signal output by the first switch circuit 10, the second switch circuit 20 maintains a default on state; when the controlled terminal of the second switch circuit 20 receives the control electrical signal output by the first switch circuit 10, the second switch circuit 20 is turned off.
The third switching circuit 30 has two states of on and off, and may be implemented by a circuit composed of a contactor or a relay. The third switch circuit 30 has the following characteristics: when the controlled end of the third switch circuit 30 receives the auxiliary heating signal output by the second switch circuit 20, the third switch circuit 30 is turned on, the ac power supplies power to the auxiliary heating device 50, and the auxiliary heating device 50 is turned on to perform heating; when the controlled terminal of the third switching circuit 30 does not receive the auxiliary heat signal output from the second switching circuit 20, the third switching circuit 30 is turned off, and the auxiliary heat device 50 is turned off to stop heating.
At present, the air conditioner set is often provided with a heat dissipation device 40 and an auxiliary heat device 50. The heat dissipation device 40 may be a fan of an air conditioner, and has the functions of heat dissipation and cooling. The auxiliary heating device 50 may be composed of a plurality of single-phase electric auxiliary heating devices, or may be composed of three-phase electric auxiliary heating devices, which is not limited herein. The auxiliary heating device 50 can adjust the indoor temperature to achieve the purpose of rapid and powerful heating. Since the auxiliary heating device 50 has a high indoor temperature when it is turned on, if only the auxiliary heating device 50 of the air conditioner is turned on and the heat sink 40 of the air conditioner is not turned on, the temperature of the air around the air conditioner may continuously rise, and in a serious case, a fire may occur.
In order to avoid the situation that the air temperature around the air conditioner is too high due to the fact that the auxiliary heating device 50 of the air conditioner is independently started, and unpredictable results are caused. According to the technical scheme of this embodiment, when a user inputs a heat dissipation signal to one of the controlled ends of the first switch circuit 10 through a wind level control module of the air conditioner, such as a remote controller, the key module, the heat dissipation signal may be a heat dissipation signal of a low wind level, a heat dissipation signal of a medium wind level, or a heat dissipation signal of a high wind level, a power input end of the first switch circuit 10 is communicated with a first power output end corresponding to the controlled end, and at this time, the heat dissipation device 40 of the air conditioner is turned on to perform heat dissipation and cooling. During the period of the heat dissipation device 40 being turned on, the connection between the power input terminal and the second power output terminal of the first switch circuit 10 is disconnected, so that the first switch circuit 10 stops outputting the control electrical signal to the second switch circuit 20, and the second switch circuit 20 maintains its default on state. During the conduction period of the second switch circuit 20, if an auxiliary heat signal is input, the input auxiliary heat signal can be transmitted to the third switch circuit 30 through the conducted second switch circuit 20 to trigger the third switch circuit 30 to conduct, so that the ac power supplies power to the auxiliary heat device 50, and the auxiliary heat device 50 is turned on to heat; during the on period of the second switching circuit 20, if no auxiliary heat signal is inputted, the auxiliary heat device 50 of the air conditioner is not turned on.
That is, if the heat dissipation device 40 of the air conditioner is in the on state, since the first switch circuit 10 does not transmit the control electrical signal to the second switch circuit 20 at this time, the second switch circuit 20 can be kept in the default on state, and if the auxiliary heat signal is input during the on period of the second switch circuit 20, the auxiliary heat device 50 of the air conditioner is turned on to perform heating; if no auxiliary heat signal is input, the auxiliary heat unit 50 of the air conditioner is not turned on. That is, according to the technical solution of this embodiment, only after the heat dissipation device 40 of the air conditioner is turned on, the auxiliary heat device 50 of the air conditioner may be turned on, so as to avoid that the indoor temperature is too high due to the fact that the auxiliary heat device 50 of the air conditioner is turned on alone without turning on the heat dissipation device 40 of the air conditioner.
If no heat dissipation signal is input to any controlled terminal of the first switch circuit 10, the power input terminal of the first switch circuit 10 is connected to the second power output terminal. The ac power source outputs a control electrical signal to the controlled terminal of the second switch circuit 20 through the second power output terminal of the first switch circuit 10, so as to trigger the second switch circuit 20 to switch from the on state to the off state. During the period when the second switch circuit 20 is turned off, the second switch circuit 20 cannot output the auxiliary heat signal to the third switch circuit 30 regardless of whether the auxiliary heat signal is input to the second switch circuit 20, so that the third switch circuit 30 maintains the turned-off state, and accordingly, the auxiliary heat device 50 of the air conditioner is not turned on.
That is, if the heat dissipation device 40 of the air conditioner is in the off state, since the first switch circuit 10 outputs the control electrical signal to the second switch circuit 20, the control electrical signal can trigger the second switch circuit 20 to switch from the default on state to the off state. During the period when the second switching circuit 20 is turned off, the auxiliary heating device 50 of the air conditioner cannot be turned on regardless of the input of the auxiliary heating signal. That is, according to the technical solution of the present embodiment, if the heat dissipation device 40 of the air conditioner is turned off, the auxiliary heat device 50 of the air conditioner cannot be turned on no matter whether the auxiliary heat signal is input during the period that the heat dissipation device 40 of the air conditioner is turned off, so as to avoid the problem of the indoor temperature being too high due to the independent turning on of the auxiliary heat device 50 of the air conditioner. Compared with the technical scheme that a fuse or a system switch is adopted, and the technical method that the circuit is automatically disconnected when the temperature of the auxiliary heating device 50 exceeds a preset temperature threshold value, the technical scheme of the embodiment is that the auxiliary heating device 50 of the air conditioner can be started on the premise that the heat dissipation device 40 of the air conditioner is started, so that the indoor temperature can be effectively prevented from being too high, and the purpose of preventing accidents is achieved.
In the technical solution of this embodiment, when one of the controlled terminals of the first switch circuit 10 receives the heat dissipation signal, the heat dissipation device 40 of the air conditioner is turned on, and the second switch circuit 20 maintains the default on state. During the conduction period of the second switch circuit 20, if an auxiliary heat signal is input, the auxiliary heat signal can be transmitted to the third switch circuit 30 through the conducted second switch circuit 20 to trigger the third switch circuit 30 to conduct, so that the auxiliary heat device 50 is powered by the ac power source, and the auxiliary heat device 50 of the air conditioner is turned on to perform heating; when any controlled end of the first switch circuit 10 does not receive the heat dissipation signal, the heat dissipation device 40 of the air conditioner is turned off, the alternating current power supply outputs a control electrical signal to the second switch circuit 20 through the second power output end of the first switch circuit 10 to control the second switch circuit 20 to be switched from the default on state to the off state, and during the off period of the second switch circuit 20, no matter whether the auxiliary heat signal is input, the auxiliary heat device 50 of the air conditioner is not turned on, so that the problem that the indoor temperature is too high due to the fact that the auxiliary heat device 50 of the air conditioner is turned on and the heat dissipation device 40 is not turned on can be effectively avoided.
Optionally, in an embodiment, referring to fig. 2, the plurality of heat dissipation signal input terminals S1 to Sn include a first heat dissipation signal input terminal HI, a second heat dissipation signal input terminal MED, and a third heat dissipation signal input terminal LOW, and the first switch circuit 10 includes a first relay RY1, a second relay RY2, and a third relay RY 3;
a first end 11 of the first relay RY1 is connected with the first heat dissipation signal input end HI, a second end 12 of the first relay RY1 is connected with an alternating current zero line N, a third end 13 of the first relay RY1 is connected with the alternating current live line L, a fourth end 14 of the first relay RY1 is connected with a third end 23 of the second relay RY2, and a fifth end 15 of the first relay RY1 is connected with an input end of the heat dissipation device 40;
the first end 21 of the second relay RY2 is connected with the second heat dissipation signal input end MED, the second end 22 of the second relay RY2 is connected with the alternating current zero line N, the fourth end 24 of the second relay RY2 is connected with the third end 33 of the third relay RY3, and the fifth end 25 of the second relay RY2 is connected with the input end of the heat dissipation device 40;
the first end 31 of the third relay RY3 is connected to the third heat dissipation signal input end LOW, the second end 32 of the third relay RY3 is connected to the alternating current zero line N, the fourth end 34 of the third relay RY3 is connected to the controlled end of the second switch circuit 20, and the fifth end 35 of the third relay RY3 is connected to the input end of the heat dissipation device 40.
The first relay RY1, the second relay RY2, and the third relay RY3 each have the following characteristics: when no heat dissipation signal is input into the first end of the relay, the third end and the fourth end of the relay are communicated; when the first end of the relay receives the heat dissipation signal, the third end and the fifth end of the relay are communicated, and the connection line of the third end and the fourth end of the relay is disconnected.
In this embodiment, the first heat dissipation signal input terminal HI, the second heat dissipation signal input terminal MED, and the third heat dissipation signal input terminal LOW are used to input heat dissipation signals of different windshields, for example, the first heat dissipation signal input terminal HI is used to input a heat dissipation signal of a high windshield, the second heat dissipation signal input terminal MED is used to input a heat dissipation signal of a medium windshield, and the third heat dissipation signal input terminal LOW is used to input a heat dissipation signal of a LOW windshield. And at the same time, the heat dissipation signals of two or more than two different windshields can not be simultaneously input, so that the logic disorder of the circuit is avoided.
Specifically, when no heat dissipation signal is input to the first end 11 of the first relay RY1, the first end 21 of the second relay RY2, and the first end 31 of the third relay RY3, the third end 13 of the first relay RY1 communicates with the fourth end 14, the third end 23 of the second relay RY2 communicates with the fourth end 24, and the third end 33 of the third relay RY3 communicates with the fourth end 34. At this time, the control electrical signal output by the ac power supply is transmitted to the controlled terminal of the second switch circuit 20 through the first relay RY1, the second relay RY2, and the third relay RY3 to trigger the second switch circuit 20 to switch from the default on state to the off state. During the period when the second switching circuit 20 is turned off, the auxiliary heating device 50 of the air conditioner cannot be turned on regardless of the input of the auxiliary heating signal.
When one of the relays of the first switch circuit 10 receives a heat dissipation signal, for example, the first end 11 of the first relay RY1 receives a heat dissipation signal of a high wind level, the third end 13 and the fifth end 15 of the first relay RY1 are communicated, and the third end 13 and the fourth end 14 of the first relay RY1 are disconnected, at this time, the ac power supply supplies power to the heat dissipation device 40 of the air conditioner through the first relay RY1, and the heat dissipation device 40 of the air conditioner is turned on and operates at the rotating speed of the high wind level to dissipate heat. Since the connection between the ac power supply and the second switch circuit 20 is disconnected at this time, the ac power supply 20 stops outputting the control electric signal to the second switch circuit 20, so that the second switch circuit 20 can maintain the default on state. When the second switch circuit 20 is turned on, if an auxiliary heat signal is input, the auxiliary heat device 50 of the air conditioner is turned on to perform heating; if no auxiliary heat signal is input, the auxiliary heat unit 50 of the air conditioner is not turned on.
In one embodiment, referring to fig. 2, the second switching circuit 20 includes a fourth relay RY 4; a first end 41 of the fourth relay RY4 is connected to the fourth end 34 of the third relay RY3, a second end 42 of the fourth relay RY4 is connected to the alternating current zero line N, a third end 43 of the fourth relay RY4 is connected to the auxiliary heat signal input end RH, and a fourth end 44 of the fourth relay RY4 is connected to the controlled end of the third switching circuit 30; the fifth end 45 of the fourth relay RY4 is floating.
The fourth relay RY4 has the following characteristics: when the first end 41 of the fourth relay RY4 has no control electric signal input, the third end 43 of the fourth relay RY4 communicates with the fourth end 44; when the first end 41 of the fourth relay RY4 receives the control electric signal, the third end 43 and the fifth end 45 of the fourth relay RY4 are communicated, and the connection of the third end 43 and the fourth end 44 of the fourth relay RY4 is disconnected.
Specifically, when a heat radiation signal is input, the heat radiation device 40 of the air conditioner is turned on, the connection line between the ac power supply and the fourth relay RY4 is disconnected, and the ac power supply stops outputting a control electrical signal to the first end 41 of the fourth relay RY4, so that the third end 43 and the fourth end 44 of the fourth relay RY4 are communicated. While third terminal 43 and fourth terminal 44 of fourth relay RY4 are in communication, if an auxiliary heat signal is input, the auxiliary heat signal can be transmitted to third switching circuit 30 via fourth relay RY4 to control third switching circuit 30 to be turned on.
When no heat dissipation signal is input, the heat dissipation device 40 of the air conditioner is turned off, the connection between the ac power supply and the fourth relay RY4 is turned on, and the ac power supply outputs a control electrical signal to the first end 41 of the fourth relay RY4 through the first switch circuit 10 to trigger the third end 43 and the fifth end 45 of the fourth relay RY4 to communicate with each other. While the third end 43 and the fifth end 45 of the fourth relay RY4 are communicated, no matter whether an auxiliary heat signal is input or not, the fourth relay RY4 cannot transmit the auxiliary heat signal to the third switching circuit 30, so that the third switching circuit 30 maintains the off state, the ac power supply cannot supply power to the auxiliary heat device 50, and the auxiliary heat device 50 is not turned on.
That is, during the time when the heat sink 40 of the air conditioner is turned on, the third terminal 43 and the fourth terminal 44 of the fourth relay RY4 communicate, at which time the user can turn on the auxiliary heating device 50 of the air conditioner; during the time when the heat sink 40 of the air conditioner is turned off, the third end 43 of the fourth relay RY4 communicates with the fifth end 45, and the user cannot turn on the auxiliary heating device 50 of the air conditioner. The user can turn on the auxiliary heating device 50 of the air conditioner only during the turn-on of the heat radiating device 40 of the air conditioner, which can avoid the problem of the excessive indoor temperature caused by the independent turn-on of the auxiliary heating device 50 of the air conditioner.
In one embodiment, referring to fig. 2, the third switching circuit 30 includes a contactor J1; the first end 1 of the contactor J1 is connected with the fourth end 44 of the fourth relay RY3, and the second end 2 of the contactor J1 is connected with the alternating current zero line N; the third end 3, the fifth end 5 and the seventh end 7 of the contactor J1 are all connected with the alternating current live wire L; the fourth terminal 4, the sixth terminal 6 and the eighth terminal 8 of the contactor J1 are all connected to the input terminal of the auxiliary heating device 50.
The Contactor (Contactor) is an electrical appliance which controls a load by closing a contact by generating a magnetic field by passing current through a coil. The third terminal 3, the fifth terminal 5 and the seventh terminal 7 of the contactor J1 may be powered by the same ac power source or different ac power sources, for example, the third terminal 3, the fifth terminal 5 and the seventh terminal 7 of the contactor J1 may be electrically connected to a single phase or three phases, but not limited thereto.
Specifically, during the time that the heat sink 40 of the air conditioner is turned on, if an auxiliary heat signal is transmitted to the first end 1 of the coil of the contactor J1 through the second switching circuit 20, the magnetic field generated by the coil of the contactor J1 closes each contact of the contactor J1, so that the ac power supplies power to the auxiliary heat device 50 of the air conditioner, and the auxiliary heat device 50 is turned on to perform heating.
During the time that the heat sink 40 of the air conditioner is turned off, since the second switching circuit 20 is also turned off, no auxiliary heat signal is transmitted to the contactor J1, no magnetic field is generated by the coil of the contactor J1, the contacts of the contactor J1 are opened, the ac power cannot supply power to the auxiliary heat device 50 of the air conditioner, and the auxiliary heat device 50 is turned off.
In one embodiment, referring to fig. 2, the over-temperature protection circuit of the air conditioner further includes a first fuse element F1, a second fuse element F2, and a third fuse element F3;
the fourth end 4 of the contactor J1 is connected to the input terminal of the auxiliary heating device 50 through the first fuse element F1; the sixth terminal 6 of the contactor J1 is connected to the input terminal of the auxiliary heating device 50 through the second fuse element F2; the eighth terminal 8 of the contactor J1 is connected to the input terminal of the auxiliary heating device 50 through the third fuse element F3.
Specifically, when the temperature of the auxiliary heating device 50 of the air conditioner is too high, the fuse element is disconnected due to the too high temperature, so as to achieve the purpose of protecting the circuit. That is, in the case where both the heat sink 40 and the auxiliary heat device 50 of the air conditioner are turned on, there is a possibility that the temperature of the auxiliary heat device 50 is too high. In order to further improve the reliability of the circuit, the present embodiment is further provided with a fuse element capable of disconnecting the electrical connection between the ac power source and the auxiliary heating device 50 to turn off the auxiliary heating device 50 to stop heating, in case that the temperature of the auxiliary heating device 50 is excessively high in case that both the heat sink 40 and the auxiliary heating device 50 of the air conditioner are turned on.
In one embodiment, referring to fig. 2, the over-temperature protection circuit of the air conditioner further includes a temperature control switch K1; the temperature control switch K1 is connected in series between the signal output terminal of the second switch circuit 20 and the controlled terminal of the third switch circuit 30.
Specifically, the over-temperature protection circuit of the air conditioner is further provided with a temperature control switch K1, and the temperature control switch K1 is a temperature control switch K1 capable of automatically recovering. When the temperature of the auxiliary heating device 50 of the air conditioner is greater than the temperature threshold of the temperature control switch K1, the temperature control switch K1 is triggered to be turned off, so that the third switch circuit 30 is turned off, the ac power supply cannot supply power to the auxiliary heating device 50, and the auxiliary heating device 50 is turned off to stop heating. When the temperature of the auxiliary heating device 50 is reduced to be less than the temperature threshold value of the temperature controlled switch K1, the temperature controlled switch K1 automatically restores the conducting state, so that the circuit is restored to normal.
The present embodiment can automatically turn off the thermostat K1 when the temperature of the auxiliary heating device 50 is too high by providing the thermostat K1, so that the auxiliary heating device 50 of the air conditioner is forced to turn off to stop heating. With this configuration, the reliability of the circuit can be further improved.
The invention also provides an air conditioner which comprises the over-temperature protection circuit of the air conditioner. The detailed structure of the over-temperature protection circuit of the air conditioner can refer to the above embodiments, and is not described herein; it can be understood that, because the over-temperature protection circuit of the air conditioner is used in the air conditioner of the present invention, the embodiment of the air conditioner of the present invention includes all technical solutions of all embodiments of the over-temperature protection circuit of the air conditioner, and the achieved technical effects are also completely the same, and are not described herein again.
The invention also provides an over-temperature protection method of the air conditioner, which is applied to the air conditioner, wherein the air conditioner comprises an over-temperature protection circuit of the air conditioner, a heat dissipation device 40 and an auxiliary heat device 50. The over-temperature protection circuit of the air conditioner comprises a first switch circuit 10, a second switch circuit 20, a third switch circuit 30, an auxiliary heat signal input end RH and a plurality of heat dissipation signal input ends S1-Sn;
a plurality of controlled terminals of the first switch circuit 10 are connected to the plurality of heat dissipation signal input terminals S1-Sn in a one-to-one correspondence manner, a power input terminal of the first switch circuit 10 is connected to an alternating current (ac) power line L, a plurality of first power output terminals of the first switch circuit 10 are all connected to an input terminal of the heat dissipation device 40, and a second power output terminal of the first switch circuit 10 is connected to a controlled terminal of the second switch circuit 20; a signal input end of the second switch circuit 20 is connected with the auxiliary heating signal input end RH, and a signal output end of the second switch circuit 20 is connected with a controlled end of the third switch circuit 30; the power input end of the third switch circuit 30 is connected to the ac live wire L, and the power output end of the third switch circuit 30 is connected to the input end of the auxiliary heating device 50.
Referring to fig. 3, the over-temperature protection method of the air conditioner includes the steps of:
step S101, judging whether any one of a plurality of heat dissipation signal input ends of an over-temperature protection circuit of the air conditioner receives a heat dissipation signal;
step S102, when one of the plurality of heat dissipation signal input terminals receives a heat dissipation signal, controlling the heat dissipation device 40 to be turned on;
step S103, when the heat dissipation device 40 is started, judging whether an auxiliary heat signal input end of an over-temperature protection circuit of the air conditioner receives an auxiliary heat signal;
step S104, when the auxiliary heat signal input end receives an auxiliary heat signal, controlling the auxiliary heat device 50 to be turned on.
At present, the air conditioner set is often provided with a heat dissipation device 40 and an auxiliary heat device 50. The heat dissipation device 40 may be a fan of an air conditioner, and has the functions of heat dissipation and cooling. The auxiliary heating device 50 may be composed of a plurality of single-phase electric auxiliary heating devices, and the auxiliary heating device 50 can adjust the indoor temperature to achieve the purpose of rapid and powerful heating. Since the auxiliary heating device 50 has a high indoor temperature when it is turned on, if only the auxiliary heating device 50 of the air conditioner is turned on and the heat sink 40 of the air conditioner is not turned on, the temperature of the air around the air conditioner may continuously rise, and in a serious case, a fire may occur.
In order to avoid the situation that the air temperature around the air conditioner is too high due to the fact that the auxiliary heating device 50 of the air conditioner is independently started, and unpredictable results are caused. According to the technical scheme of this embodiment, when a user inputs a heat dissipation signal to one of the controlled ends of the first switch circuit 10 through a wind level control module of the air conditioner, such as a remote controller, the key module, the heat dissipation signal may be a heat dissipation signal of a low wind level, a heat dissipation signal of a medium wind level, or a heat dissipation signal of a high wind level, a power input end of the first switch circuit 10 is communicated with a first power output end corresponding to the controlled end, and at this time, the heat dissipation device 40 of the air conditioner is turned on to perform heat dissipation and cooling. During the period of the heat dissipation device 40 being turned on, the connection between the power input terminal and the second power output terminal of the first switch circuit 10 is disconnected, so that the first switch circuit 10 stops outputting the control electrical signal to the second switch circuit 20, and the second switch circuit 20 maintains its default on state. During the period when the second switch circuit 20 is turned on, if an auxiliary heat signal is inputted, the inputted auxiliary heat signal can be transmitted to the third switch circuit 30 through the turned-on second switch circuit 20 to trigger the third switch circuit 30 to be turned on, so that the auxiliary heat device 50 is powered by the ac power source, and the auxiliary heat device 50 is turned on to perform heating.
That is, if the heat sink 40 of the air conditioner is in the on state, since the first switch circuit 10 does not transmit the control electrical signal to the second switch circuit 20 at this time, the second switch circuit 20 can be kept on, and if the auxiliary heat signal is input during the on period of the second switch circuit 20, the auxiliary heat device 50 of the air conditioner is turned on to perform heating. That is, according to the technical solution of this embodiment, only after the heat dissipation device 40 of the air conditioner is turned on, the auxiliary heat device 50 of the air conditioner may be turned on, so as to avoid that the indoor temperature is too high due to the fact that the auxiliary heat device 50 of the air conditioner is turned on alone without turning on the heat dissipation device 40 of the air conditioner.
In an embodiment, after step S101, the method further includes:
step S105, controlling the heat dissipation device 40 and the auxiliary heat device 50 to be turned off when none of the heat dissipation signal input terminals receives a heat dissipation signal.
If no heat dissipation signal is input to any controlled terminal of the first switch circuit 10, the power input terminal of the first switch circuit 10 is connected to the second power output terminal. The ac power source outputs a control electrical signal to the controlled terminal of the second switch circuit 20 through the second power output terminal of the first switch circuit 10, so as to trigger the second switch circuit 20 to turn off. During the period when the second switch circuit 20 is turned off, the second switch circuit 20 cannot output the auxiliary heat signal to the third switch circuit 30 regardless of whether the auxiliary heat signal is input to the second switch circuit 20, so that the third switch circuit 30 maintains the turned-off state, and accordingly, the auxiliary heat device 50 of the air conditioner is not turned on.
That is, if the heat dissipation device 40 of the air conditioner is in the off state, since the first switch circuit 10 outputs the control electrical signal to the second switch circuit 20, the control electrical signal can trigger the second switch circuit 20 to switch from the default on state to the off state. During the period when the second switching circuit 20 is turned off, the auxiliary heating device 50 of the air conditioner cannot be turned on regardless of the input of the auxiliary heating signal. That is, according to the technical solution of the present embodiment, if the heat dissipation device 40 of the air conditioner is turned off, the auxiliary heat device 50 of the air conditioner cannot be turned on no matter whether the auxiliary heat signal is input during the period that the heat dissipation device 40 of the air conditioner is turned off, so as to avoid the problem of the indoor temperature being too high due to the independent turning on of the auxiliary heat device 50 of the air conditioner. Compared with the technical scheme that a fuse or a system switch is adopted, and the technical method that the circuit is automatically disconnected when the temperature of the auxiliary heating device 50 exceeds a preset temperature threshold value, the technical scheme of the embodiment is that the auxiliary heating device 50 of the air conditioner can be started on the premise that the heat dissipation device 40 of the air conditioner is started, so that the indoor temperature can be effectively prevented from being too high, and the purpose of preventing accidents is achieved.
In an embodiment, after step S103, the method further includes:
and step S106, controlling the auxiliary heating device 50 to be turned off when the auxiliary heating signal input end does not receive the auxiliary heating signal.
During the on-period of the air conditioner, the connection between the power input terminal and the second power output terminal of the first switch circuit 10 is disconnected, so that the first switch circuit 10 stops outputting the control electrical signal to the second switch circuit 20, and the second switch circuit 20 maintains its default on-state. During the on period of the second switching circuit 20, if no auxiliary heat signal is inputted, the auxiliary heat device 50 of the air conditioner is not turned on.
In the technical solution of this embodiment, when one of the controlled terminals of the first switch circuit 10 receives the heat dissipation signal, the heat dissipation device 40 of the air conditioner is turned on, and the second switch circuit 20 maintains the default on state. During the conduction period of the second switch circuit 20, if an auxiliary heat signal is input, the auxiliary heat signal can be transmitted to the third switch circuit 30 through the conducted second switch circuit 20 to trigger the third switch circuit 30 to conduct, so that the auxiliary heat device 50 is powered by the ac power source, and the auxiliary heat device 50 of the air conditioner is turned on to perform heating; when any controlled end of the first switch circuit 10 does not receive the heat dissipation signal, the heat dissipation device 40 of the air conditioner is turned off, the alternating current power supply outputs a control electrical signal to the second switch circuit 20 through the second power output end of the first switch circuit 10 to control the second switch circuit 20 to be switched from the default on state to the off state, and during the off period of the second switch circuit 20, no matter whether the auxiliary heat signal is input, the auxiliary heat device 50 of the air conditioner is not turned on, so that the problem that the indoor temperature is too high due to the fact that the auxiliary heat device 50 of the air conditioner is turned on and the heat dissipation device 40 is not turned on can be effectively avoided.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The over-temperature protection circuit of the air conditioner is characterized by comprising a first switch circuit, a second switch circuit, a third switch circuit, an auxiliary heat signal input end and a plurality of heat dissipation signal input ends;
a plurality of controlled ends of the first switch circuit are connected with the plurality of heat dissipation signal input ends in a one-to-one correspondence manner, a power supply input end of the first switch circuit is connected with an alternating current live wire, and a plurality of first power supply output ends of the first switch circuit are connected with the input end of the heat dissipation device;
the second switching circuit includes a fourth relay; a first end of the fourth relay is connected with a second power output end of the first switch circuit, a second end of the fourth relay is connected with an alternating current zero line, a third end of the fourth relay is connected with the auxiliary heating signal input end, and a fourth end of the fourth relay is connected with a controlled end of the third switch circuit, wherein the first end of the fourth relay is in a conducting state when not receiving a control electric signal output by the first switch circuit, and is in a disconnecting state when receiving the control electric signal output by the first switch circuit;
and the power supply input end of the third switching circuit is connected with the alternating current live wire, and the power supply output end of the third switching circuit is connected with the input end of the auxiliary heating device.
2. The over-temperature protection circuit of an air conditioner according to claim 1, wherein the plurality of heat dissipation signal input terminals include a first heat dissipation signal input terminal, a second heat dissipation signal input terminal, and a third heat dissipation signal input terminal, and the first switching circuit includes a first relay, a second relay, and a third relay;
a first end of the first relay is connected with the first heat dissipation signal input end, a second end of the first relay is connected with an alternating current zero line, a third end of the first relay is connected with an alternating current live wire, a fourth end of the first relay is connected with a third end of the second relay, and a fifth end of the first relay is connected with the input end of the heat dissipation device;
the first end of the second relay is connected with the second heat dissipation signal input end, the second end of the second relay is connected with the alternating current zero line, the fourth end of the second relay is connected with the third end of the third relay, and the fifth end of the second relay is connected with the input end of the heat dissipation device;
the first end of the third relay is connected with the third heat dissipation signal input end, the second end of the third relay is connected with the alternating current zero line, the fourth end of the third relay is connected with the controlled end of the second switch circuit, and the fifth end of the third relay is connected with the input end of the heat dissipation device.
3. The over-temperature protection circuit of an air conditioner according to claim 2, wherein a first terminal of the fourth relay is connected to a fourth terminal of the third relay.
4. The over-temperature protection circuit of an air conditioner according to claim 3, wherein the third switching circuit includes a contactor;
the first end of the contactor is connected with the fourth end of the fourth relay, and the second end of the contactor is connected with the alternating current zero line; the third end, the fifth end and the seventh end of the contactor are connected with the alternating current live wire; and the fourth end, the sixth end and the eighth end of the contactor are connected with the input end of the auxiliary heating device.
5. The over-temperature protection circuit of an air conditioner according to claim 4, further comprising a first fuse element, a second fuse element, and a third fuse element;
the fourth end of the contactor is connected with the input end of the auxiliary heating device through the first fuse element; the sixth end of the contactor is connected with the input end of the auxiliary heating device through the second fuse element; and the eighth end of the contactor is connected with the input end of the auxiliary heating device through the third fuse element.
6. The over-temperature protection circuit of an air conditioner according to any one of claims 1 to 5, wherein the over-temperature protection circuit of an air conditioner further comprises a temperature control switch;
the temperature control switch is connected in series between the signal output end of the second switch circuit and the controlled end of the third switch circuit.
7. An air conditioner characterized in that it comprises an over-temperature protection circuit of an air conditioner according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911131005.7A CN110701762B (en) | 2019-11-18 | 2019-11-18 | Over-temperature protection circuit of air conditioner, air conditioner and over-temperature protection method of air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911131005.7A CN110701762B (en) | 2019-11-18 | 2019-11-18 | Over-temperature protection circuit of air conditioner, air conditioner and over-temperature protection method of air conditioner |
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| CN110701762A CN110701762A (en) | 2020-01-17 |
| CN110701762B true CN110701762B (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911131005.7A Active CN110701762B (en) | 2019-11-18 | 2019-11-18 | Over-temperature protection circuit of air conditioner, air conditioner and over-temperature protection method of air conditioner |
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| CN112283904B (en) * | 2020-09-11 | 2021-12-14 | 海信（山东）空调有限公司 | Air conditioner control system and air conditioner |
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| US5131455A (en) * | 1990-02-08 | 1992-07-21 | Sanyo Electric Co., Ltd. | Low power electrical fan motor and heater thermal protection circuit for air conditioner |
| CN201307224Y (en) * | 2008-06-04 | 2009-09-09 | 深圳和而泰智能控制股份有限公司 | Relay latching circuit |
| CN204165240U (en) * | 2014-09-25 | 2015-02-18 | 成都锐奕信息技术有限公司 | Air-heater heating resistance wire delay closing circuit system |
| CN104764142A (en) * | 2015-03-20 | 2015-07-08 | 广东志高空调有限公司 | Air conditioning electric heating safety control circuit |
| CN204830347U (en) * | 2015-06-29 | 2015-12-02 | 苏州艾意菲特机电科技有限公司 | Air conditioner control circuit |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131455A (en) * | 1990-02-08 | 1992-07-21 | Sanyo Electric Co., Ltd. | Low power electrical fan motor and heater thermal protection circuit for air conditioner |
| CN201307224Y (en) * | 2008-06-04 | 2009-09-09 | 深圳和而泰智能控制股份有限公司 | Relay latching circuit |
| CN204165240U (en) * | 2014-09-25 | 2015-02-18 | 成都锐奕信息技术有限公司 | Air-heater heating resistance wire delay closing circuit system |
| CN104764142A (en) * | 2015-03-20 | 2015-07-08 | 广东志高空调有限公司 | Air conditioning electric heating safety control circuit |
| CN204830347U (en) * | 2015-06-29 | 2015-12-02 | 苏州艾意菲特机电科技有限公司 | Air conditioner control circuit |
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