A heating system and its temperature control device

Abstract

An embodiment of the present invention discloses a heating system and its temperature control device. The heating system includes a thermostat and heating equipment. The thermostat includes a temperature detection switch, and the heating equipment includes a signal input circuit, a signal output circuit, and a main controller. The main controller is used to provide a first signal with a specific frequency to the signal input circuit, so that the signal input circuit outputs a second signal with a specific frequency. The main controller is also used to receive a third signal output by the signal output circuit, and when it detects that the frequency of the third signal is different from the specific frequency, it determines that the first contact and the second contact of the temperature detection switch are disconnected. In the embodiment of the present invention, regardless of whether the line between the temperature detection switch and the heating equipment is interfered, the main controller can accurately determine the on-off state of the temperature detection switch according to whether the frequency of the third signal is the same as the specific frequency, thereby accurately controlling the operation of the heating equipment and ensuring the normal operation of the heating system.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of temperature detection, and particularly to a heating system and its temperature control device. Background Art

[0002] In winter, current household heating can be divided into independent heating and centralized heating. Independent heating saves power consumption and can also solve the problem of difficult heating in southern regions and rural areas, and is favored by more and more families.

[0003] The independent heating system can be controlled separately for on and off, and mainly consists of a thermostat and a heater. The thermostat collects the indoor temperature. When the indoor temperature reaches the set temperature, the temperature detection switch of the thermostat is turned off, and at this time the heater stops heating. When the indoor temperature is lower than the set temperature, the temperature detection switch of the thermostat is turned on, and at this time the heater heats.

[0004] The position of the indoor thermostat is determined by the user, so the length of the connection line between the thermostat and the heater is not necessarily fixed. When the temperature detection switch is turned off, the connection line between the thermostat and the heater is easily affected by interference signal radiation, resulting in the heater being unable to correctly receive the on-off state of the temperature detection switch. Summary of the Invention

[0005] The embodiments of the present invention provide a heating system and its temperature control device to achieve the effect of accurately determining the on-off state of the temperature detection switch.

[0006] The embodiments of the present invention provide a heating system, including: a thermostat and a heating device. The thermostat includes a temperature detection switch, and the heating device includes a signal input circuit, a signal output circuit, and a main controller;

[0007] The temperature detection switch includes a first contact and a second contact. The output end of the signal input circuit is electrically connected to the first contact of the temperature detection switch, the input end of the signal output circuit is electrically connected to the second contact of the temperature detection switch, and the main controller is electrically connected to the input end of the signal input circuit and the output end of the signal output circuit respectively;

[0008] The main controller is used to provide a first signal with a specific frequency to the signal input circuit, so that the signal input circuit outputs a second signal with the specific frequency;

[0009] The main controller is further used to receive a third signal output by the signal output circuit, and when it detects that the frequency of the third signal is different from the specific frequency, it determines that the first contact and the second contact of the temperature detection switch are disconnected.

[0010] Based on the same inventive concept, an embodiment of the present invention further provides a temperature control device for a heating system. The heating system includes a thermostat and a heating device. The thermostat includes a temperature detection switch, and the heating device includes a signal input circuit, a signal output circuit, and a temperature control device. The temperature detection switch includes a first contact and a second contact. The output end of the signal input circuit is electrically connected to the first contact of the temperature detection switch, the input end of the signal output circuit is electrically connected to the second contact of the temperature detection switch, and the temperature control device is electrically connected to the input end of the signal input circuit and the output end of the signal output circuit respectively.

[0011] The temperature control device includes:

[0012] A signal input module for providing a first signal with a specific frequency to the signal input circuit, so that the signal input circuit outputs a second signal with the specific frequency;

[0013] A signal detection module for receiving a third signal output by the signal output circuit, and when it detects that the frequency of the third signal is different from the specific frequency, determining that the first contact and the second contact of the temperature detection switch are disconnected.

[0014] In the embodiment of the present invention, the main controller provides a first signal with a specific frequency to the signal input circuit, so that the signal input circuit outputs a second signal with a specific frequency; the main controller receives the third signal output by the signal output circuit; when the temperature detection switch is turned on, the third signal received by the main controller must have the same specific frequency as the first signal, and when the temperature detection switch is turned off, regardless of whether it is affected by external interference, the third signal received by the main controller does not have the specific frequency. Therefore, when the main controller detects that the frequency of the third signal is different from the specific frequency, it can determine that the first contact and the second contact of the temperature detection switch are disconnected. It can be seen from this that regardless of whether the line between the temperature detection switch and the heating device is interfered, the main controller can accurately determine the on-off state of the temperature detection switch, and the detection result is not affected by external stray signals, realizing the isolation of external radiation interference, suitable for long-distance thermostat detection. The main controller can accurately control the operation of the heating device based on this, ensuring the normal operation of the heating system. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, although the following drawings are some specific embodiments of the present invention, for those skilled in the art, according to the basic concepts of the device structure, driving method, and manufacturing method disclosed and prompted by various embodiments of the present invention, they can be extended and extended to other structures and drawings. Undoubtedly, these should all be within the scope of the claims of the present invention.

[0016] Figure 1 is a schematic diagram of a heating system provided by an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of another heating system provided by an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of the heating system being disconnected;

[0019] Figure 4 is a schematic diagram of the heating system being conducted;

[0020] Figure 5 is a waveform diagram of the first signal;

[0021] Figure 6 is a waveform diagram of another first signal;

[0022] Figure 7 is a circuit schematic diagram of the signal input circuit;

[0023] Figure 8 is a circuit schematic diagram of the heating system. Detailed implementation manners

[0024] To make the purpose, technical solutions, and advantages of the present invention clearer, the following will, with reference to the drawings in the embodiments of the present invention, clearly and completely describe the technical solutions of the present invention through implementation manners. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the basic concepts disclosed and prompted by the embodiments of the present invention, all other embodiments obtained by those skilled in the art fall within the scope of protection of the present invention.

[0025] Reference Figure 1As shown in the figure, it is a schematic diagram of a heating system provided by an embodiment of the present invention. The heating system provided by this embodiment includes: a thermostat 1 and a heating device 2. The thermostat 1 includes a temperature detection switch 11, and the heating device 2 includes a signal input circuit 2a, a signal output circuit 2c, and a main controller 2d. The temperature detection switch 11 includes a first contact 11a and a second contact 11b. The output end of the signal input circuit 2a is electrically connected to the first contact 11a of the temperature detection switch 11, and the input end of the signal output circuit 2c is electrically connected to the second contact 11b of the temperature detection switch 11. The main controller 2d is respectively electrically connected to the input end of the signal input circuit 2a and the output end of the signal output circuit 2c. The main controller 2d is used to provide a first signal with a specific frequency to the signal input circuit 2a, so that the signal input circuit 2a outputs a second signal with a specific frequency. The main controller 2d is also used to receive a third signal output by the signal output circuit 2c, and when it detects that the frequency of the third signal is different from the specific frequency, it determines that the first contact 11a and the second contact 11b of the temperature detection switch 11 are disconnected.

[0026] Optionally, the main controller 2d is further used to determine that the first contact 11a and the second contact 11b of the temperature detection switch 11 are conducting when it detects that the frequency of the third signal is equal to the specific frequency.

[0027] Reference Figure 2 As shown in the figure, it is a schematic diagram of another heating system provided by an embodiment of the present invention. As Figure 2 shown, optionally, the heating device 2 further includes: a wiring board 2b. The wiring board 2b includes a first end and a second end. The first end of the wiring board 2b is respectively electrically connected to the output end of the signal input circuit 2a and the first contact 11a of the temperature detection switch 11, and the second end of the wiring board 2b is respectively electrically connected to the input end of the signal output circuit 2c and the second contact 11b of the temperature detection switch 11. In this embodiment, the output end of the signal input circuit 2a of the heating device 2 and the first contact 11a of the temperature detection switch 11 of the thermostat 1 are electrically connected through the wiring board 2b, which can improve the stability of the signal transmission between the signal input circuit 2a and the thermostat 1. The input end of the signal output circuit 2c of the heating device 2 and the second contact 11b of the temperature detection switch 11 of the thermostat 1 are electrically connected through the wiring board 2b, which can improve the stability of the signal transmission between the signal output circuit 2c and the thermostat 1.

[0028] In this embodiment, the heating system includes a thermostat 1, which can be installed at any designated position in the user's room, such as any designated position in the living room, bedroom, etc. The thermostat 1 is integrated with a temperature sensor, and a temperature threshold is preset, and a temperature detection switch 11 is also integrated. It can be understood that this temperature threshold is the upper limit of the indoor temperature preset by the system or the user. The thermostat 1 collects the indoor ambient temperature through the temperature sensor, calls the temperature threshold, compares the indoor ambient temperature with the temperature threshold, and controls the on-off state of the temperature detection switch 11 according to the comparison result.

[0029] The thermostat 1 calls the temperature sensor to collect the indoor ambient temperature regularly or irregularly, and then detects whether the indoor ambient temperature is greater than the temperature threshold. If it is detected that the indoor ambient temperature is greater than the temperature threshold, the temperature detection switch 11 is controlled to be disconnected; if it is detected that the indoor ambient temperature is less than or equal to the temperature threshold, the temperature detection switch 11 is controlled to be turned on.

[0030] The temperature detection switch 11 includes a first contact 11a and a second contact 11b. The disconnection of the temperature detection switch 11 means the disconnection between the first contact 11a and the second contact 11b of the temperature detection switch 11, and the conduction of the temperature detection switch 11 means the conduction between the first contact 11a and the second contact 11b of the temperature detection switch 11.

[0031] In this embodiment, the heating system includes a heating device 2. The thermostat 1 and the heating device 2 are electrically connected. Specifically, the temperature detection switch 11 in the thermostat 1 and the heating device 2 are electrically connected. The heating device 2 includes a signal input circuit 2a, a signal output circuit 2c, and a main controller 2d. Among them, the output end of the main controller 2d is connected to the input end of the signal input circuit 2a, the output end of the signal input circuit 2a (or can be connected to the first end of the wiring board 2b) is connected to the first contact 11a of the temperature detection switch 11, the second contact 11b of the temperature detection switch 11 (or can be connected to the second end of the wiring board 2b) is connected to the input end of the signal output circuit 2c, and the output end of the signal output circuit 2c is electrically connected to the input end of the main controller 2d. It can be understood that this heating device 2 is any kind of heating furnace and heater.

[0032] It can be understood that the main controller 2d, the signal input circuit 2a, the temperature detection switch 11, and the signal output circuit 2c are connected in series in sequence to form a loop.

[0033] Reference Figure 3As shown in the figure, it is a schematic diagram of the disconnection of the heating system. If the temperature sensor 1 detects that the indoor ambient temperature is greater than the temperature threshold, it controls the temperature detection switch 11 to disconnect. That is, the connection between the first contact 11a and the second contact 11b of the temperature detection switch 11 is disconnected, and then the loop formed by the main controller 2d, the signal input circuit 2a, the temperature detection switch 11, and the signal output circuit 2c connected in series in sequence is disconnected. Specifically, the transmission path between the signal input circuit 2a and the signal output circuit 2c is disconnected, so the output signal of the signal output circuit 2c received by the input end of the main controller 2d has no relation to the signal output from the output end of the main controller 2d to the signal input circuit 2a.

[0034] Reference Figure 4 As shown in the figure, it is a schematic diagram of the conduction of the heating system. If the temperature sensor 1 detects that the indoor ambient temperature is less than or equal to the temperature threshold, it controls the temperature detection switch 11 to conduct. That is, the connection between the first contact 11a and the second contact 11b of the temperature detection switch 11 is conducted, and then the loop formed by the main controller 2d, the signal input circuit 2a, the temperature detection switch 11, and the signal output circuit 2c connected in series in sequence is conducted. Specifically, the transmission path between the signal input circuit 2a and the signal output circuit 2c is conducted, so the output signal of the signal output circuit 2c received by the input end of the main controller 2d is related to the signal output from the output end of the main controller 2d to the signal input circuit 2a.

[0035] Therefore, the main controller 2d can determine the on-off state between the first contact 11a and the second contact 11b of the temperature detection switch 11 by judging whether the signal output to the signal input circuit 2a is related to the signal received from the signal output circuit 2c.

[0036] In this embodiment, the output end of the main controller 2d is used to provide a first signal with a specific frequency to the signal input circuit 2a, and then the second signal output from the output end of the signal input circuit 2a also has the same specific frequency as the first signal. The input end of the main controller 2d is used to receive the third signal output from the signal output circuit 2c.

[0037] If the connection between the first contact 11a and the second contact 11b of the temperature detection switch 11 is conducted, then the input end of the signal output circuit 2c receives the second signal through the temperature detection switch 11, and the third signal output from the signal output circuit 2c also has the same specific frequency as the second signal. If the connection between the first contact 11a and the second contact 11b of the temperature detection switch 11 is disconnected, then the input end of the signal output circuit 2c cannot receive the second signal with a specific frequency, and the third signal output from the signal output circuit 2c has no relation to the second signal, so the frequencies of the two signals are different.

[0038] Based on this, when the main controller 2d detects that the frequency of the third signal is different from the specific frequency, it directly determines that the first contact 11a and the second contact 11b of the temperature detection switch 11 are disconnected. When the main controller 2d detects that the frequency of the third signal is the specific frequency, it directly determines that the first contact 11a and the second contact 11b of the temperature detection switch 11 are conducting. The main controller 2d can achieve accurate detection of the on-off state of the temperature detection switch 11.

[0039] In addition, the temperature detection switch 11 is connected to the heating device 2 by a circuit. The longer the connection circuit is, the more easily the input end of the signal output circuit 2c is interfered with. When the first contact 11a and the second contact 11b of the temperature detection switch 11 are disconnected, external stray signals or radiation are likely to interfere with the connection circuit between the temperature detection switch 11 and the heating device 2, and then the input end of the signal output circuit 2c is interfered, resulting in the third signal output being affected by the external stray signal. However, it can be known that the third signal after external interference is still not related to the second signal, so the frequency of the third signal must be different from the specific frequency.

[0040] Based on this, when the external stray signal or radiation interferes with the connection circuit between the temperature detection switch 11 and the heating device 2, the main controller 2d can accurately determine the on-off state of the first contact 11a and the second contact 11b of the temperature detection switch 11 according to the frequency of the third signal, realizing the identification and isolation of external stray signals, and avoiding the interference of the outside world on the heating system.

[0041] It should be noted that the main controller 2d of the heating device 2 controls the heating state of the heating device 2 according to the on-off state of the temperature detection switch 11. When the temperature detector 1 detects that the indoor environmental temperature is less than or equal to the temperature threshold, the temperature detection switch 11 is in the conducting state. At this time, the indoor environmental temperature does not exceed the temperature threshold, indicating that the heating device 2 should be heated to increase the indoor temperature. Then, when the main controller 2d detects that the temperature detection switch 11 is in the conducting state, it controls the heating device 2 to heat to increase the indoor environmental temperature. When the temperature detector 1 detects that the indoor environmental temperature is greater than the temperature threshold, the temperature detection switch 11 is in the disconnected state. At this time, the indoor environmental temperature exceeds the temperature threshold, indicating that the indoor temperature is high enough and does not need to be heated. Then, when the main controller 2d detects that the temperature detection switch 11 is in the disconnected state, it controls the heating device 2 to stop heating to save power consumption.

[0042] As described above, the main controller can accurately determine the on-off state of the temperature detection switch, and its detection process and results are not interfered by external signals, realizing the isolation of external stray signals. On this basis, the main controller can accurately control the operation of the heating device, ensuring the normal operation of the heating system.

[0043] Optionally, the first signal is a fixed voltage signal with a specific frequency; alternatively, the first signal is a voltage signal and the waveform of the voltage signal is a square wave.

[0044] Reference Figure 5 As shown is the waveform diagram of the first signal. Optionally, the master controller processes a fixed voltage signal (such as 5V) at a specific frequency (such as 330Hz), and the processed signal is the first signal.

[0045] Reference Figure 6 As shown is the waveform diagram of the first signal. Optionally, the master controller directly provides a square wave signal, which includes a high level (such as 5V) and a low level (such as 0V), and the frequencies of the high and low levels of the square wave signal are at a specific frequency (such as 330Hz), then the square wave signal is the first signal.

[0046] It can be understood that the frequencies of the signals at the input end and the output end of the signal input circuit are the same (such as 330Hz). Optionally, the signal amplitude, period and other parameters of the signals at the input end and the output end of the signal input circuit can be the same or different; correspondingly, if the frequency of the third signal is 330Hz, then the master controller can determine that the temperature detection switch is turned on. On the contrary, if the third signal is not equal to 330Hz, such as a constant electrical signal, or a pulse signal, or other frequency signals, then the master controller can determine that the temperature detection switch is turned off.

[0047] Optionally, the ratio of the specific frequency to 50Hz is not an integer. Optionally, the specific frequency is 330Hz, and the ratio of 330Hz to 50Hz is 6.6; optionally, the specific frequency is 125Hz, and the ratio of 125Hz to 50Hz is 2.5. Optionally, the specific frequency is a preset adjustable frequency value, as long as it meets the condition that the ratio to 50Hz is not an integer, and it is not specifically limited. Obviously, the frequency of the first signal output by the master controller is a known specific frequency, then by detecting whether the frequency of the received third signal is the specific frequency, the on-off state of the temperature detection switch can be detected. Usually, the external radiation interference that interferes with the heating system is the mains power, and the frequency of the mains power signal is 50Hz. If the specific frequency is an integer multiple of 50Hz, then it is impossible to identify whether the frequency of the third signal is the specific frequency or the mains power signal frequency. Therefore, the ratio of the specific frequency to 50Hz being not an integer can avoid mains power interference and ensure the stability of detection.

[0048] In an embodiment of the present invention, the master controller provides a first signal with a specific frequency to the signal input circuit, causing the signal input circuit to output a second signal with a specific frequency; the master controller receives a third signal output by the signal output circuit; when the temperature detection switch is turned on, the third signal received by the master controller necessarily has the same specific frequency as the first signal, and when the temperature detection switch is turned off, regardless of whether it is affected by external interference, the third signal received by the master controller does not have a specific frequency. Therefore, when the master controller detects that the frequency of the third signal is different from the specific frequency, it can determine that the first contact and the second contact of the temperature detection switch are disconnected. It can be seen that regardless of whether the line between the temperature detection switch and the heating device is interfered with, the master controller can accurately determine the on / off state of the temperature detection switch, the detection result is not interfered by external stray signals, the isolation of external radiation interference is achieved, and it is applicable to the detection of a thermostat at a long distance. Based on this, the master controller can accurately control the operation of the heating device, ensuring the normal operation of the heating system.

[0049] Exemplarily, on the basis of the above technical solution, with reference to Figure 7 shown in the figure, it is a schematic diagram of the signal input circuit. As Figure 7 shown in the figure, the optional signal input circuit 2a includes: a first switch structure 21 and a second switch structure 22; the first switch structure 21 is electrically connected to the master controller, and the first switch structure 21 is further connected between the second switch structure 22 and the first power supply terminal VG1. The first switch structure 21 turns off and on at a specific frequency under the control of the first signal; the second switch structure 22 is further connected between the second power supply terminal VG2 and the first contact of the temperature detection switch. The second switch structure 22 turns off and on at a specific frequency under the control of the first switch structure 21 to convert the fixed voltage signal provided by the second power supply terminal VG2 into a second signal.

[0050] The control end of the first switch structure 21 is electrically connected to the master controller for receiving the first signal with a specific frequency provided by the master controller. For example, the specific frequency of the first signal is 330 Hz, and the first signal output by the master controller controls the first switch structure 21 to switch the on / off state at a frequency of 330 Hz. The output end of the first switch structure 21 is connected to the second switch structure 22 and the input end is connected to the first power supply terminal VG1. When the first switch structure 21 is turned on, the output end of the first switch structure 21 is at the same potential as the first power supply terminal VG1. Given that the first switch structure 21 switches the on / off state at a frequency of 330 Hz, the output end of the first switch structure 21 is pulled to the potential of the first power supply terminal VG1 at a frequency of 330 Hz.

[0051] The control terminal of the second switch structure 22 is electrically connected to the output terminal of the first switch structure 21. The input terminal of the second switch structure 22 is connected to the second power supply terminal VG2, and the output terminal is connected to the first contact of the temperature detection switch. When the output terminal of the first switch structure 21 is pulled to the potential of the first power supply terminal VG1, under the action of the first power supply terminal VG1 and the second power supply terminal VG2, the second switch structure 22 is turned on, and the fixed voltage signal provided by the second power supply terminal VG2 is transmitted to the first contact of the temperature detection switch. It is known that the output terminal of the first switch structure 21 is pulled to the potential of the first power supply terminal VG1 at a frequency of 330 Hz. Then, the second switch structure 22 switches between on and off states at a frequency of 330 Hz to output the second power supply terminal VG2 at a frequency of 330 Hz, and the output signal is the second signal with 330 Hz.

[0052] It can be understood that the selected value of the first signal with 330 Hz should ensure that the first switch structure 21 is turned on and off at a frequency of 330 Hz, and no specific example is given here; the selected values of the first power supply terminal VG1 and the second power supply terminal VG2 should ensure that the second switch structure 22 is turned on, and no specific example is given here. For example, the first power supply terminal VG1 can be selected as the ground terminal, and the potential of the second power supply terminal VG2 is +12V.

[0053] Reference Figure 8 As shown, it is a schematic diagram of a heating system. As Figure 8 shown, the first switch structure 21 can include a first resistor R1, a second resistor R2, and a first transistor M1. The first resistor R1 is connected between the main controller 2d and the control terminal of the first transistor M1. The second resistor R2 is connected between the control terminal of the first transistor M1 and the first terminal. The first terminal of the first transistor M1 is also connected to the first power supply terminal; the second switch structure 22 includes a third resistor R3, a fourth resistor R4, and a second transistor M2. The third resistor R3 is connected between the second terminal of the first transistor M1 and the control terminal of the second transistor M2. The first terminal of the second transistor M2 is electrically connected to the second power supply terminal through the fourth resistor R4. The second terminal of the second transistor M2 (or can be connected to the first contact 11a of the temperature detection switch 11 through the first terminal of the wiring board 2b). The first power supply terminal can be selected as the ground terminal GND, and the fixed voltage signal provided by the second power supply terminal can be +12V. The first transistor M1 can be selected as an NPN transistor, and the second transistor M2 can be a PNP transistor; the high level of the first signal is greater than or equal to the threshold voltage of the first transistor M1. The first transistor M1 and the second transistor M2 can both be triodes.

[0054] In other embodiments, the first transistor can also be selected as a PNP transistor, and the second transistor can be a PNP transistor; the low level of the first signal is less than or equal to the threshold voltage of the first transistor; the first transistor and the second transistor can also be selected as MOS transistors.

[0055] As Figure 8 shown, after the first signal of 330 Hz output by the main controller 2d is divided by the first resistor R1 and the second resistor R2, it controls the first transistor M1 to conduct or turn off. The first transistor M1 is an NPN transistor. If the high level of the first signal is greater than or equal to the threshold voltage of the first transistor M1, when the first signal is at a high level, the first transistor M1 is controlled to conduct, and when the first signal is not at a high level, the first transistor M1 is controlled to turn off. Given that the high level frequency of the first signal is 330 Hz, the first transistor M1 conducts and turns off at a frequency of 330 Hz.

[0056] When the first transistor M1 conducts and turns off at a frequency of 330 Hz, the second terminal of the first transistor M1 is pulled down to the potential of the ground terminal GND at a frequency of 330 Hz. It can be understood that the control terminal of the second transistor M2 is pulled down to the potential v1 at a frequency of 330 Hz, where v1 is slightly greater than the potential of the ground terminal GND and less than +12V. The fixed voltage signal provided by the second power supply terminal is +12V. The second transistor M2 is a PNP transistor. When the second terminal of the first transistor M1 is pulled down to the potential of the ground terminal GND, that is, the control terminal of the second transistor M2 is v1, the second transistor M2 conducts. After the +12V voltage signal is divided by the fourth resistor R4 and the second transistor M2, it becomes v2. Then the voltage signal received by the first terminal of the wiring board 2b is v2. Given that the second terminal of the first transistor M1 is pulled down to the potential of the ground terminal GND at a frequency of 330 Hz, the second transistor M2 conducts at a frequency of 330 Hz. Correspondingly, the first terminal of the wiring board 2b receives the voltage signal v2 at a frequency of 330 Hz and transmits it to the first contact 11a of the temperature detection switch 11.

[0057] If the first contact 11a and the second contact 11b of the temperature detection switch 11 conduct, the voltage signal v2 output at a frequency of 330 Hz enters the input end of the signal output circuit 2c through the conducting temperature detection switch 11, so that the signal output by the output end of the signal output circuit 2c is 330 Hz. The main controller 2d can determine that the temperature detection switch conducts according to the 330 Hz signal output by the signal output circuit 2c.

[0058] If the first contact 11a and the second contact 11b of the temperature detection switch 11 are turned off, the voltage signal v2 output at a frequency of 330 Hz cannot enter the input end of the signal output circuit 2c. When no external interference signal enters the input end of the signal output circuit 2c, the third signal v3 output at the output end of the signal output circuit 2c should be related to the +5V voltage signal on the left side of the resistor R8, that is, the +5V signal forms the third signal v3 after being divided by R8 and R9. The third signal v3 is a constant voltage signal, so the main controller 2d can determine that the temperature detection switch is turned off and the heating device is not affected by external signal interference according to the constant voltage signal output by the signal output circuit 2c. When a 50Hz external interference signal enters the input end of the signal output circuit 2c, the third signal v3 output at the output end of the signal output circuit 2c will be affected by the external interference signal. For example, if the 50Hz commercial power is the interference signal that interferes with the input end of the signal output circuit 2c, then the frequency of the third signal v3 output at the output end of the signal output circuit 2c is 50Hz. Then the main controller 2d can determine that the temperature detection switch 11 is turned off and the heating device is affected by external signal interference according to the 50Hz signal or irregular signal output by the signal output circuit 2c.

[0059] In this embodiment, the main controller 2d can accurately determine the on / off state of the temperature detection switch 11 according to the third signal output by the signal output circuit 2c, realizing the isolation of interference signals; and when it is detected that the temperature detection switch 11 is turned off, it can also identify whether the heating device is affected by external signal interference according to the frequency of the third signal output by the signal output circuit 2c.

[0060] Based on the same inventive concept, the embodiment of the present invention also provides a temperature control device for a heating system. The heating system in this embodiment is the heating system described in any of the above embodiments. The heating system includes a thermostat and a heating device. The thermostat includes a temperature detection switch. The heating device includes a signal input circuit, a signal output circuit and a temperature control device; the temperature detection switch includes a first contact and a second contact. The output end of the signal input circuit is electrically connected to the first contact of the temperature detection switch. The input end of the signal output circuit is electrically connected to the second contact of the temperature detection switch. The temperature control device is electrically connected to the input end of the signal input circuit and the output end of the signal output circuit respectively. The temperature detection device can execute the functions of the main controller described in any of the above embodiments, is implemented in a software and / or hardware manner, and is configured to be applied in the heating device. Optionally, the temperature detection device includes a MUC or other control components.

[0061] The temperature control device provided by the embodiment of the present invention includes: a signal input module, configured to provide a first signal with a specific frequency to a signal input circuit, so that the signal input circuit outputs a second signal with a specific frequency; a signal detection module, configured to receive a third signal output by a signal output circuit, and determine that the first contact and the second contact of the temperature detection switch are disconnected when it is detected that the frequency of the third signal is different from the specific frequency.

[0062] In this embodiment, the heating device is connected to a temperature detection switch on a user's indoor thermostat. When the indoor temperature reaches the set temperature threshold, the thermostat controls the temperature detection switch to disconnect. The main controller compares and obtains that the frequencies of the first signal and the third signal are inconsistent, and then controls the heating device to stop heating. When the indoor temperature is lower than the set temperature threshold, the thermostat controls the temperature detection switch to conduct. The main controller compares and obtains that the frequencies of the first signal and the third signal are the same, and then controls the heating device to heat. It can be understood that a specific frequency is preset in the temperature detection device, and the selection condition of this specific frequency is different from the frequency of external interference signals, so as to ensure the accuracy of the detection process and results and realize the identification and isolation of external interference signals.

[0063] It can be understood that the position of the indoor thermostat is determined by the user, and the length of the connection line between the corresponding temperature detection switch and the heating device is not necessarily fixed. The longer the connection line is, the more easily it is affected by external interference signal radiation when the connection line is disconnected. The temperature detection device provided by this embodiment can accurately judge the on-off state of the temperature detection switch, is not affected by the length of the connection line, is not interfered by the external environment, can distinguish the influence of radiation interference, is applicable to the temperature detection of a long-distance heating system, solves the problem that the connection wire bundle of the heating system is easily interfered, and ensures the normal operation of the heating device.

[0064] The temperature detection device provided by this embodiment can completely isolate the interference signals in the circuit, the detection is not affected by external radiation interference, the detection accuracy is improved, and it is applicable to a long-distance thermostat detection system. In addition, the specific frequency output by the main controller is adjustable, which can effectively avoid the frequency of external interference signals, ensure the stability of temperature detection, and is applicable to normal operation in various places with complex environments.

[0065] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, mutual combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A heating system, characterized in that, Comprising: A thermostat and a heating device, wherein the thermostat includes a temperature detection switch, and the heating device includes a signal input circuit, a signal output circuit, and a main controller; The temperature detection switch includes a first contact and a second contact. The output end of the signal input circuit is electrically connected to the first contact of the temperature detection switch, the input end of the signal output circuit is electrically connected to the second contact of the temperature detection switch, and the main controller is electrically connected to the input end of the signal input circuit and the output end of the signal output circuit respectively; The main controller is used to provide a first signal with a specific frequency to the signal input circuit, so that the signal input circuit outputs a second signal with the specific frequency; The main controller is further used to receive a third signal output by the signal output circuit, and when it detects that the frequency of the third signal is different from the specific frequency, it determines that the first contact and the second contact of the temperature detection switch are disconnected; The selection condition of the specific frequency is different from the frequency of an external interference signal, and the external interference signal includes commercial power; The signal input circuit includes: a first switching structure and a second switching structure; The first switching structure is electrically connected to the main controller, and the first switching structure is further connected between the second switching structure and the first power supply terminal. The first switching structure is turned off and on at the specific frequency under the control of the first signal; The second switching structure is further connected between the second power supply terminal and the first contact of the temperature detection switch. The second switching structure is turned off and on at the specific frequency under the control of the first switching structure to convert the fixed voltage signal provided by the second power supply terminal into the second signal.

2. The heating system according to claim 1, wherein The main controller is further used to determine that the first contact and the second contact of the temperature detection switch are conducting when it detects that the frequency of the third signal is equal to the specific frequency.

3. The heating system according to claim 1, characterized in that, The ratio of the specific frequency to 50 Hz is non-integer.

4. The heating system according to claim 1, characterized in that, The first switching structure includes a first resistor, a second resistor, and a first transistor. The first resistor is connected between the main controller and the control terminal of the first transistor, the second resistor is connected between the control terminal of the first transistor and the first terminal of the first transistor, and the first terminal of the first transistor is further connected to the first power supply terminal; The second switching structure includes a third resistor, a fourth resistor, and a second transistor. The third resistor is connected between the second terminal of the first transistor and the control terminal of the second transistor. The first terminal of the second transistor is electrically connected to the second power supply terminal through the fourth resistor, and the second terminal of the second transistor is connected to the first contact of the temperature detection switch.

5. The heating system according to claim 4, characterized in that, The first transistor is an NPN-type transistor, and the second transistor is a PNP-type transistor; The high level of the first signal is greater than or equal to the threshold voltage of the first transistor.

6. The heating system according to claim 4, characterized in that, The first transistor is a PNP-type transistor, and the second transistor is a PNP-type transistor; The low level of the first signal is less than or equal to the threshold voltage of the first transistor.

7. The heating system according to claim 4, characterized in that, Both the first transistor and the second transistor are triodes or MOS transistors.

8. The heating system according to claim 1, wherein The first signal is a fixed voltage signal with the specific frequency; alternatively, the first signal is a voltage signal and the waveform of the voltage signal is a square wave.

9. The heating system according to claim 1, characterized in that, The heating device further includes: a wiring board; The wiring board includes a first end and a second end. The first end of the wiring board is electrically connected to the output end of the signal input circuit and the first contact of the temperature detection switch respectively, and the second end of the wiring board is electrically connected to the input end of the signal output circuit and the second contact of the temperature detection switch respectively.

10. A temperature control device for a heating system, characterized in that, The heating system includes a thermostat and a heating device. The thermostat includes a temperature detection switch. The heating device includes a signal input circuit, a signal output circuit and a temperature control device. The temperature detection switch includes a first contact and a second contact. The output end of the signal input circuit is electrically connected to the first contact of the temperature detection switch. The input end of the signal output circuit is electrically connected to the second contact of the temperature detection switch. The temperature control device is electrically connected to the input end of the signal input circuit and the output end of the signal output circuit respectively. The temperature control device includes: A signal input module for providing a first signal with a specific frequency to the signal input circuit, so that the signal input circuit outputs a second signal with the specific frequency. A signal detection module for receiving a third signal output by the signal output circuit, and determining that the first contact and the second contact of the temperature detection switch are disconnected when it is detected that the frequency of the third signal is different from the specific frequency. The selection condition of the specific frequency is different from the frequency of an external interference signal, and the external interference signal includes commercial power. The signal input circuit includes: a first switch structure and a second switch structure; The first switch structure is electrically connected to the main controller, and the first switch structure is also connected between the second switch structure and the first power supply terminal. The first switch structure is turned off and on at the specific frequency under the control of the first signal. The second switch structure is also connected between the second power supply terminal and the first contact of the temperature detection switch. The second switch structure is turned off and on at the specific frequency under the control of the first switch structure to convert the fixed voltage signal provided by the second power supply terminal into the second signal.

Images