Central air conditioner terminal anti-theft control circuit and control method thereof

Abstract

The invention discloses a central air conditioner terminal anti-theft control circuit and a control method thereof. The anti-theft control circuit comprises a fan driving circuit, a valve driving circuit and a feedback detection circuit. The input end of the fan driving circuit is electrically connected with an external corresponding control chip, and the output end of the fan driving circuit is electrically connected with the fan; the valve driving circuit is electrically connected with an external corresponding control chip, and the output end of the valve driving circuit is electrically connected with the valve; and the input end of the feedback detection circuit is electrically connected with the output end of the fan driving circuit. According to the anti-theft fan coil, anti-theft control can be achieved under the condition that an existing fan coil circuit and an existing fan coil structure do not need to be changed.

Description

Technical Field

[0001] The present invention relates to the technical field of central air conditioner thermostats, and specifically, to an anti-theft control circuit and a control method for the end of a central air conditioner. Background Art

[0002] Currently, with the improvement of people's living standards in our country, air conditioners are used more and more widely. Compared with split air conditioners, central air conditioners have the characteristics of high energy efficiency ratio and great energy-saving potential, and have great advantages in temperature control for multiple rooms. In the air conditioner control of centralized dormitory buildings such as domestic university dormitories and apartments, using central air conditioners for centralized cooling and heating has become the main trend in the future.

[0003] A central air conditioner mainly consists of a refrigeration station, a medium pipeline, and the end of the central air conditioner. For buildings that use central air conditioners and require independent charging, the on-off of the air conditioner end is controlled to achieve timing charging. Currently, the on-off of the central air conditioner end is mainly achieved by a thermostat with remote control function, as well as control and charging. The current thermostats on the market do not have anti-theft functions and are easily used to use the air conditioner without being billed by changing the controller circuit, causing economic losses to the operators of central air conditioners.

[0004] The Chinese patent application with the application number 201320561012.2 discloses "An intelligent thermostat applied to a fan coil air conditioner system", and its technical solution is as follows: including a microprocessor module, a temperature measurement module, a relay module for adjusting the flow of chilled water and hot water in the fan coil, a data storage module, and a power supply module; the temperature measurement module, the relay module, and the data storage module are respectively connected to the corresponding ports of the microprocessor module, and the power supply module is connected to the microprocessor module to supply power to the intelligent thermostat. The temperature measurement module includes first to third temperature sensors, and the first to third temperature sensors are respectively placed at the return air outlet, the water inlet of the fan coil, and the water outlet of the fan coil of the air conditioner system, and transmit the collected temperature signals to the microprocessor module in real time. The microprocessor module is provided with a set temperature, which processes the received signals to control the operation of the microprocessor module and stores the obtained air conditioner energy charging data in the data storage module. Its technical solution does not solve the technical problem that the central air conditioner is easily stolen and driven for control. Summary of the Invention

[0005] In order to solve the technical problem that the central air conditioner in the prior art is easily stolen and driven for control, the present invention provides an anti-theft control circuit and a control method for the end of a central air conditioner. The technical solution adopted by the present invention is as follows:

[0006] The first aspect of the present invention provides an anti-theft control circuit for the terminal of a central air conditioner, including a fan drive circuit, a valve drive circuit, and a feedback detection circuit; the input end of the fan drive circuit is electrically connected to a corresponding external control chip, and the output end is electrically connected to the fan; the valve drive circuit is electrically connected to a corresponding external control chip, and the output end is electrically connected to the valve; the input end of the feedback detection circuit is electrically connected to the output end of the fan drive circuit.

[0007] As a preferred solution, the fan drive circuit includes Relay 1, Relay 2, and Relay 3;

[0008] The 3rd pin of Relay 1 is connected to the live wire, the 4th pin is connected to the input end of the low-speed gear of the fan, and the 1st and 2nd pins are electrically connected to the external control chip;

[0009] The 3rd pin of Relay 2 is connected to the live wire, the 4th pin is connected to the input end of the medium-speed gear of the fan, and the 1st and 2nd pins are electrically connected to the external control chip;

[0010] The 3rd pin of Relay 3 is connected to the live wire, the 4th pin is connected to the input end of the high-speed gear of the fan, and the 1st and 2nd pins are electrically connected to the external control chip.

[0011] As a preferred solution, Relay 1, Relay 2, and Relay 3 are all normally open relays.

[0012] As a preferred solution, the valve drive circuit includes Relay 4, the 3rd pin of Relay 4 is connected to the live wire, the 4th pin is connected to the input end of the valve, and the 1st and 2nd pins are electrically connected to the external control chip.

[0013] As a preferred solution, Relay 4 is a normally open relay.

[0014] As a preferred solution, the feedback detection circuit includes a current-limiting resistor and an optocoupler; one end of the current-limiting resistor is connected to the 4th pin of Relay 3, and the other end is connected to the 1st pin of the optocoupler; the 2nd pin of the optocoupler is connected to the neutral wire, and the 3rd and 4th pins output a feedback signal to the external control chip.

[0015] As a preferred solution, the anti-theft control circuit further includes a reverse protection circuit, the reverse protection circuit includes a diode, the positive pole of the diode is connected to the neutral wire, and the negative pole is connected to the 1st pin of the optocoupler.

[0016] The second aspect of the present invention provides a control method for an anti-theft control circuit of the terminal of a central air conditioner, and the method includes:

[0017] When any one of control relays 1, 2, and 3 is closed and the feedback detection circuit outputs a high level to the external control chip, the access state of the anti-theft control circuit is normal;

[0018] When control relays 1, 2, and 3 are all opened and the feedback circuit outputs a low level to the external control chip, the access state of the anti-theft control circuit is normal;

[0019] When control relays 1, 2, and 3 are all opened and the feedback circuit still outputs a high level to the external control chip, it can be determined that the fan is driven and controlled by theft.

[0020] As a preferred solution, the method further includes:

[0021] Controlling relay 1 to close through the external control chip to achieve low-speed rotation of the fan;

[0022] Controlling relay 2 to close through the external control chip to achieve medium-speed rotation of the fan;

[0023] Controlling relay 3 to close through the external control chip to achieve high-speed rotation of the fan;

[0024] Controlling relay 4 to close through the external control chip to achieve valve switch control.

[0025] The third aspect of the present invention provides a computer device, including a storage medium, a processor, and a computer program stored in the storage medium and executable by the processor. When the computer program is executed by the processor, it implements the steps of the control method of an anti-theft control circuit for the end of a central air conditioner described above.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] Through the fan drive circuit, the valve drive circuit, and the feedback detection circuit, the present invention can detect whether the fan is connected to the thermostat and the connected switch state, and can judge whether there is an act of privately controlling the air conditioner by bypassing the air conditioner panel according to the current control state of the air conditioner, reducing the economic loss caused to the operator of the central air conditioner due to the theft-driven control of the fan. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of an anti-theft control circuit for the end of a central air conditioner provided in this embodiment. Detailed Embodiment

[0029] The drawings are only for illustrative purposes and cannot be construed as a limitation to the present invention;

[0030] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the embodiments of this application.

[0031] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of this application. The singular forms "a", "the", and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0032] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are only examples of devices and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In addition, in the description of this application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The following further elaborates on the present invention in conjunction with the drawings and embodiments.

[0034] The following further elaborates on the present invention in conjunction with the drawings and embodiments.

[0035] Embodiment 1

[0036] Please refer to Figure 1 , this embodiment provides a theft-proof control circuit for the end of a central air conditioner, including a fan drive circuit, a valve drive circuit, and a feedback detection circuit; the input end of the fan drive circuit is electrically connected to a corresponding external control chip, and the output end is electrically connected to the fan; the valve drive circuit is electrically connected to a corresponding external control chip, and the output end is electrically connected to the valve; the input end of the feedback detection circuit is electrically connected to the output end of the fan drive circuit.

[0037] In a specific embodiment, the fan drive circuit includes Relay 1, Relay 2, and Relay 3;

[0038] The third pin of Relay 1 is connected to the live wire, the fourth pin is connected to the low-speed gear input terminal of the fan, and the first and second pins are electrically connected to an external control chip;

[0039] The third pin of Relay 2 is connected to the live wire, the fourth pin is connected to the medium-speed gear input terminal of the fan, and the first and second pins are electrically connected to an external control chip;

[0040] The third pin of Relay 3 is connected to the live wire, the fourth pin is connected to the high-speed gear input terminal of the fan, and the first and second pins are electrically connected to an external control chip.

[0041] In a specific embodiment, Relay 1, Relay 2, and Relay 3 are all normally open relays.

[0042] In a specific embodiment, the valve drive circuit includes Relay 4. The third pin of Relay 4 is connected to the live wire, the fourth pin is connected to the valve input terminal, and the first and second pins are electrically connected to an external control chip.

[0043] In a specific embodiment, Relay 4 is a normally open relay.

[0044] In a specific embodiment, the feedback detection circuit includes a current-limiting resistor and an optocoupler; one end of the current-limiting resistor is connected to the fourth pin of Relay 3, and the other end is connected to the first pin of the optocoupler; the second pin of the optocoupler is connected to the neutral wire, and the third and fourth pins output a feedback signal to the external control chip.

[0045] In a specific embodiment, the anti-theft control circuit further includes a reverse protection circuit. The reverse protection circuit includes a diode. The positive electrode of the diode is connected to the neutral wire, and the negative electrode is connected to the first pin of the optocoupler.

[0046] Embodiment 2

[0047] Please refer to Figure 1 , this embodiment provides a control method for the anti-theft control circuit of the central air-conditioning terminal. The method includes:

[0048] When any one of Relay 1, Relay 2, and Relay 3 is closed and the feedback detection circuit outputs a high level to the external control chip, it is determined that the access state of the anti-theft control circuit is normal;

[0049] When the control relays 1, 2, and 3 are all turned off and the feedback circuit outputs a low level to the external control chip, it is determined that the access state of the anti-theft control circuit is normal;

[0050] When the control relays 1, 2, and 3 are all turned off and the feedback circuit still outputs a high level to the external control chip, it can be determined that the fan is being stolen and driven.

[0051] In a specific embodiment, please refer to Figure 1 , the method further includes:

[0052] Controlling relay 1 to close through the external control chip to achieve low-speed rotation of the fan;

[0053] Controlling relay 2 to close through the external control chip to achieve medium-speed rotation of the fan;

[0054] Controlling relay 3 to close through the external control chip to achieve high-speed rotation of the fan;

[0055] Controlling relay 4 to close through the external control chip to achieve valve switch control.

[0056] Embodiment 3

[0057] A computer device includes a storage medium, a processor, and a computer program stored in the storage medium and executable by the processor. When the computer program is executed by the processor, it implements the steps of the control method of an anti-theft control circuit for the end of a central air conditioner described in Embodiment 2.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A central air-conditioning terminal anti-theft control circuit, characterized in that: It includes a fan drive circuit, a valve drive circuit and a feedback detection circuit; the input end of the fan drive circuit is electrically connected to the corresponding external control chip, and the output end is electrically connected to the fan; the valve drive circuit is electrically connected to the corresponding external control chip, and the output end is electrically connected to the valve; the input end of the feedback detection circuit is electrically connected to the output end of the fan drive circuit.

2. A central air-conditioning terminal anti-theft control circuit according to claim 1, characterized in that: The fan drive circuit includes relay 1, relay 2 and relay 3; The third pin of the relay 1 is connected to the live wire, the fourth pin is connected to the low speed gear input terminal of the fan, and the first pin and the second pin are electrically connected to the external control chip; The third pin of the relay 2 is connected to the live wire, the fourth pin is connected to the medium speed gear input terminal of the fan, and the first pin and the second pin are electrically connected to the external control chip; The third pin of the relay 3 is connected to the live wire, the fourth pin is connected to the high-speed gear input terminal of the fan, and the first pin and the second pin are electrically connected to the external control chip.

3. A central air-conditioning terminal anti-theft control circuit according to claim 2, characterized in that: The relay 1, the relay 2, and the relay 3 are all normally open relays.

4. A central air-conditioning terminal anti-theft control circuit according to claim 1, characterized in that: The valve driving circuit comprises a relay 4, wherein the third pin of the relay 4 is connected to the live wire, the fourth pin is connected to the valve input terminal, and the first pin and the second pin are electrically connected to the external control chip.

5. A central air-conditioning terminal anti-theft control circuit according to claim 4, characterized in that: The relay 4 is a normally open relay.

6. A central air-conditioning terminal anti-theft control circuit according to claim 2, characterized in that: The feedback detection circuit includes a current limiting resistor and an optocoupler; one end of the current limiting resistor is connected to the fourth pin of the relay 3, and the other end is connected to the first pin of the optocoupler; the second pin of the optocoupler is connected to the neutral line, and the third and fourth pins output feedback signals to the external control chip.

7. A central air-conditioning terminal anti-theft control circuit according to claim 6, characterized in that: The anti-theft control circuit further includes a reverse protection circuit, which includes a diode, wherein the anode of the diode is connected to the neutral line, and the cathode of the diode is connected to the first pin of the optical coupler.

8. A control method for a central air-conditioning terminal anti-theft control circuit, characterized in that: The method comprises: When the control relay 1, relay 2, and relay 3 are closed at will, and the feedback detection circuit outputs a high level to the external control chip, it is determined that the access state of the anti-theft control circuit is normal; When the control relay 1, relay 2 and relay 3 are all disconnected, and the feedback circuit outputs a low level to the external control chip, it is determined that the access state of the anti-theft control circuit is normal; When the control relays 1, 2 and 3 are all disconnected, and the feedback circuit still outputs a high level to the external control chip, it can be determined that the fan is being driven and controlled by theft.

9. A control method for a central air-conditioning terminal anti-theft control circuit according to claim 8, characterized in that: The method further comprises: The external control chip controls relay 1 to close, so that the fan rotates at a low speed; The external control chip controls the closing of relay 2 to achieve medium-speed rotation of the fan; The external control chip controls the relay 3 to close, so that the fan can rotate at high speed; The valve switch control is realized by controlling the relay 4 to close through the external control chip.

10. A computer device, characterized in that: It includes a storage medium, a processor, and a computer program stored in the storage medium and executable by the processor, and when the computer program is executed by the processor, the steps of a control method for a central air-conditioning terminal anti-theft control circuit as described in any one of claims 8 to 9 are implemented.

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