OT communication and room temperature control interface detection circuit

Abstract

The utility model particularly relates to an OT communication and room temperature control interface detection circuit, which comprises a main control chip MCU, and is characterized by further comprising an OT communication data transmitting circuit, an OT communication data receiving circuit, a room temperature controller detection circuit and an OT communication room temperature control interface, the OT-TX end of the main control chip MCU is connected with the OT communication data transmitting circuit, and the OT communication data receiving circuit is connected with the room temperature controller detection circuit. The RMS end of the main control chip MCU is connected with the room temperature controller detection circuit, and the OT communication data transmitting circuit and the OT communication data receiving circuit are respectively connected with the OT communication room temperature control interface. The indoor temperature control circuit has the beneficial effects that through the combination of the main control chip MCU, the indoor temperature controller detection circuit and the OT communication indoor temperature control interface, the requirements of more users only needing to be connected with either one of the OT communication module or the indoor temperature controller can be met, and the functional compatibility and the cost performance of the product are realized.

Description

Technical Field

[0001] The utility model specifically relates to an OT communication and room temperature control interface detection circuit. Background Art

[0002] With the rapid development of smart home concepts and the demands of international market development, connecting home or commercial HVAC equipment to an OT communication module compliant with the EU OpenTherm protocol has become a necessity. To meet this functional upgrade requirement, the device's existing room temperature controller interface must be retained to ensure end users have full control over their choice. To achieve this functional upgrade, the device must either retain the existing interface while adding a dedicated OT communication interface, or upgrade the existing room temperature controller interface to accommodate both the OT communication module and the room temperature controller, using a single interface.

[0003] Adding a dedicated OT communication interface is certainly feasible, as it can meet the needs of a small number of users who need to connect to both the OT communication module and the room temperature controller. However, for the majority of users who only need to connect to either the OT communication module or the room temperature controller, retaining two interfaces is not only a waste of functionality but also increases the difficulty of installation. If the wrong connection is made, it may cause equipment damage and other accidents.

[0004] Therefore, developing a compatible interface is more suitable for meeting market needs. This compatible interface not only allows the optional connection of an OT communication module compliant with the EU OpenTherm protocol, enabling full-function operation of devices in the smart home system, including system power on / off, timing, temperature setting, and display of system operating status and fault information, but also allows the optional connection of a passive switch-type room temperature controller, enabling instant and scheduled power on / off of home heating equipment. Summary of the Invention

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to provide an OT communication and room temperature control interface detection circuit that meets the needs of users of OT communication modules. This circuit not only upgrades product functionality but also improves product compatibility and cost-effectiveness.

[0006] According to the utility model, an OT communication and room temperature control interface detection circuit includes a main control chip (MCU), an OT communication data transmission circuit, an OT communication data receiving circuit, a room temperature controller detection circuit, and an OT communication room temperature control interface. The OT-TX terminal of the main control chip MCU is connected to the OT communication data transmission circuit, the RMS terminal of the main control chip MCU is connected to the room temperature controller detection circuit, and the OT-RX OT terminal of the main control chip MCU is connected to the OT communication data receiving circuit. The room temperature controller detection circuit detects the OT communication data transmission circuit and the OT communication data receiving circuit respectively, and the OT communication data transmission circuit and the OT communication data receiving circuit are respectively connected to the OT communication room temperature control interface. The OT communication room temperature control interface is connected to an OT communication module or a passive switch-type room temperature controller.

[0007] Specifically, the OT communication data sending circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first NPN switch transistor Q1 and a second PNP switch transistor Q2, the first resistor R1 is connected to the base of the first NPN switch transistor Q1, the common end between the first resistor R1 and the base of the first NPN switch transistor Q1 is connected to the second resistor R2, the fourth resistor R4 is connected to the emitter of the first NPN switch transistor Q1, and the first NPN switch The collector of the first NPN switch type transistor Q1 is connected to the base of the second PNP switch type transistor Q2, the common end between the collector of the first NPN switch type transistor Q1 and the base of the second PNP switch type transistor Q2 is connected to the third resistor R3, the fifth resistor R5 is connected to the emitter of the second PNP switch type transistor Q2, the other end of the fifth resistor R5 is connected to the other end of the third resistor R3, the common end between the fifth resistor R5 and the third resistor R3 is connected to the 24V power supply end, and the sixth resistor R6 is connected to the collector of the second PNP switch type transistor Q2.

[0008] Specifically, the OT communication data receiving circuit includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first non-polar capacitor C1, a second non-polar capacitor C2, a first voltage regulator diode D1 and a third NPN switch-type transistor Q3; the seventh resistor R7 is connected to the collector of the third NPN switch-type transistor Q3, and the common end between the seventh resistor R7 and the collector of the third NPN switch-type transistor Q3 is respectively connected to the eighth resistor R8 and the first non-polar capacitor C1, the other end of the eighth resistor R8 is connected to the 5V power supply end, the second non-polar capacitor C2 and the ninth resistor R9 are connected in parallel, one common end of the second non-polar capacitor C2 and the ninth resistor R9 is connected to the base of the third NPN switch-type transistor Q3, the other common end of the second non-polar capacitor C2 and the ninth resistor R9 is connected to the emitter of the third NPN switch-type transistor Q3, and one common end of the second non-polar capacitor C2 and the ninth resistor R9 is also connected to the tenth resistor R10.

[0009] Specifically, the room temperature controller detection circuit includes an eleventh resistor R11, a twelfth resistor R12, a third electrolytic capacitor C3, and a fourth PNP switch type transistor Q4; the eleventh resistor R11 and the base of the fourth PNP switch type transistor Q4, the twelfth resistor R12 and the third electrolytic capacitor C3 are respectively connected to the collector of the fourth PNP switch type transistor Q4, the other end of the eleventh resistor R11 is connected to the OT communication data receiving circuit, and the emitter of the fourth PNP switch type transistor Q4 is connected to the OT communication data sending circuit.

[0010] Specifically, the OT communication room temperature control interface circuit includes a first interface OT-RM1 and a second interface OT-RM2 of a second switching diode D2, a third switching diode D3, and a fourth polar capacitor C4. The second switching diode D2, the third switching diode D3, and one end of the fourth polar capacitor C4 are connected, and the common end between the second switching diode D2, the third switching diode D3, and the fourth polar capacitor C4 is connected to the first interface OT-RM1, and the other end of the fourth polar capacitor C4 is connected to the second interface OT-RM2.

[0011] The beneficial effect of this utility model is that, through the combination of the main control chip MCU, the room temperature controller detection circuit, and the OT communication room temperature control interface, this circuit can meet the needs of a wider range of users who only need to choose between connecting to an OT communication module or a room temperature controller. It can connect not only to OT communication modules that comply with the EU OpenTherm protocol, but also to passive switch-type room temperature controllers. This facilitates the needs of traditional users while also meeting the needs of users who use OT communication modules. This not only achieves a functional upgrade, but also improves the functional compatibility and cost-effectiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings.

[0013] Figure 1 It is a circuit diagram of the present utility model. DETAILED DESCRIPTION

[0014] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0015] Reference below Figure 1 An OT communication and room temperature control interface detection circuit according to an embodiment of the present invention is described.

[0016] like Figure 1 The figure shows an OT communication and room temperature control interface detection circuit, which includes a main control chip (MCU), an OT communication data transmission circuit, an OT communication data receiving circuit, a room temperature controller detection circuit, and an OT communication room temperature control interface. The OT-TX terminal of the main control chip MCU is connected to the OT communication data transmission circuit, the RMS terminal of the main control chip MCU is connected to the room temperature controller detection circuit, and the OT-RX OT terminal of the main control chip MCU is connected to the OT communication data receiving circuit. The room temperature controller detection circuit detects the OT communication data transmission circuit and the OT communication data receiving circuit, respectively. The OT communication data transmission circuit and the OT communication data receiving circuit are respectively connected to the OT communication room temperature control interface. The OT communication room temperature control interface is connected to an OT communication module or a passive switch-type room temperature controller.

[0017] This circuit, combining a main control chip (MCU), a room temperature controller detection circuit, and an OT communication room temperature control interface, can meet the needs of a wider range of users who only need to choose between connecting to an OT communication module or a room temperature controller. It can connect not only to OT communication modules compliant with the EU OpenTherm protocol but also to passive switch-type room temperature controllers. This facilitates the needs of traditional users while also meeting the needs of users who prefer OT communication modules. This not only upgrades product functionality but also improves functional compatibility and cost-effectiveness.

[0018] The OT communication data sending circuit of this circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first NPN switch type transistor Q1 and a second PNP switch type transistor Q2, the first resistor R1 is connected to the base of the first NPN switch type transistor Q1, the common end between the first resistor R1 and the base of the first NPN switch type transistor Q1 is connected to the second resistor R2, the fourth resistor R4 is connected to the emitter of the first NPN switch type transistor Q1, and the first NPN switch type transistor Q2 is connected to the emitter of the first NPN switch type transistor Q1. The collector of the transistor Q1 is connected to the base of the second PNP switch type transistor Q2, the common end between the collector of the first NPN switch type transistor Q1 and the base of the second PNP switch type transistor Q2 is connected to the third resistor R3, the fifth resistor R5 is connected to the emitter of the second PNP switch type transistor Q2, the other end of the fifth resistor R5 is connected to the other end of the third resistor R3, the common end between the fifth resistor R5 and the third resistor R3 is connected to the 24V power supply end, and the sixth resistor R6 is connected to the collector of the second PNP switch type transistor Q2.

[0019] The OT communication data receiving circuit described in this circuit includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first non-polar capacitor C1, a second non-polar capacitor C2, a first voltage regulator diode D1 and a third NPN switch-type transistor Q3; the seventh resistor R7 is connected to the collector of the third NPN switch-type transistor Q3, and the common end between the seventh resistor R7 and the collector of the third NPN switch-type transistor Q3 is respectively connected to the eighth resistor R8 and the first non-polar capacitor C1, the other end of the eighth resistor R8 is connected to a 5V power supply terminal, the second non-polar capacitor C2 and the ninth resistor R9 are connected in parallel, one common end of the second non-polar capacitor C2 and the ninth resistor R9 is connected to the base of the third NPN switch-type transistor Q3, the other common end of the second non-polar capacitor C2 and the ninth resistor R9 is connected to the emitter of the third NPN switch-type transistor Q3, and one common end of the second non-polar capacitor C2 and the ninth resistor R9 is also connected to the tenth resistor R10. The room temperature controller detection circuit of this circuit includes an eleventh resistor R11, a twelfth resistor R12, a third electrolytic capacitor C3, and a fourth PNP switching transistor Q4. The eleventh resistor R11 is connected to the base of the fourth PNP switching transistor Q4, and the twelfth resistor R12 and the third electrolytic capacitor C3 are respectively connected to the collector of the fourth PNP switching transistor Q4. The other end of the eleventh resistor R11 is connected to the OT communication data receiving circuit, and the emitter of the fourth PNP switching transistor Q4 is connected to the OT communication data transmitting circuit. The OT communication room temperature control interface circuit of this circuit includes a second switching diode D2, a third switching diode D3, and a first interface OT-RM1 and a second interface OT-RM2 of a fourth non-polar capacitor C4. The second switching diode D2, the third switching diode D3, and one end of the fourth non-polar capacitor C4 are connected. The common end of the second switching diode D2, the third switching diode D3, and the fourth non-polar capacitor C4 is connected to the first interface OT-RM1, and the other end of the fourth non-polar capacitor C4 is connected to the second interface OT-RM2.

[0020] like Figure 1 As shown, the main control chip MCU operates at its rated 5V voltage and can automatically detect and determine the type of device connected to the first interface OT-RM1 and the second interface OT-RM2 and communicate with them or perform related operations according to the instructions of the interface device.

[0021] When the interface device is an OT communication module, the main control chip MCU is responsible for data interaction and communication with the OT communication module. Through it, full-function operation of the equipment in the smart home system can be realized, including system power on and off, timing and temperature setting, etc., and display of system operation status and fault information; when the interface device is a room temperature controller, it can realize instant or timed power on and off operation of home heating equipment.

[0022] like Figure 1 As shown, its OT communication data transmission circuit not only enables communication between the main control chip MCU and the OT communication module, but also provides power for the passive OT communication module. During normal operation, the main control chip MCU outputs a square wave data signal with a certain frequency through its data transmission OT-TX port. The data signal is amplified at 5V by the first resistor R1, the second resistor R2, and the first PNP transistor Q1. It is then modulated to 24V voltage and power by the third resistor R3, the fourth resistor R4, and the second PNP transistor Q2, resulting in a 24V power signal with a certain driving power. This signal is then current-limited by the fifth resistor R5 and the sixth resistor R6 and output to the OT communication / room temperature control interface circuit. This 24V power signal not only transmits the data signal to the OT communication module, but is also polarity-corrected and rectified by the OT communication module to generate a stable voltage for its own power supply.

[0023] like Figure 1 As shown, when the OT communication room temperature control interface circuit is connected to the OT communication module, when a data signal is sent from the OT communication module to the host computer, the signal passes through the upper and lower clamping protection of the OT communication / room temperature control interface circuit and is filtered by the fourth capacitor C4. After being stepped down by the first voltage regulator diode D1 in the OT communication data receiving circuit, it is modulated by the third NPN transistor Q3 through the ninth resistor R9, the tenth resistor R10 and the second capacitor C2. The modulated signal is a level-inverted signal (the original high level becomes a low level, and the low level becomes a high level). After being filtered by the first capacitor C1, the signal is voltage-corrected by the seventh resistor R7 and the eighth resistor R8, and then input into the data receiving OT-RX port of the main control chip MCU.

[0024] like Figure 1As shown, when the OT communication / room temperature control interface circuit is connected to the room temperature controller, if the room temperature controller is in the ON state, the first interface OT-RM1 and the second interface OT-RM2 are short-circuited, that is, the first interface OT-RM1 is grounded and at zero voltage. At this time, the third transistor Q3 in the OT communication data receiving circuit is in the OFF state, and its collector voltage is high. Therefore, the fourth PNP transistor Q4 in the room temperature controller detection circuit is also in the OFF state, and the room temperature control detection port RMS of the main control chip MCU is low. If the room temperature controller is in the OFF state, the first interface OT-RM1 and the second interface OT-RM2 are unused. At this time, the third transistor Q3 in the OT communication data receiving circuit can only receive the signal output from the data transmission port OT-TX of the main control chip MCU. This signal is stepped down by the first voltage regulator diode D1 and modulates the third NPN transistor Q3 and the fourth PNP transistor Q4. When the base of the fourth PNP transistor Q4 is at a low signal level, the fourth PNP transistor Q4 saturates and opens, instantly charging the first capacitor C1. When the base of the fourth PNP transistor Q4 is at a high signal level, the fourth PNP transistor Q4 is turned off, and the first capacitor C1 can discharge through the twelfth resistor R12. The discharge time of the first capacitor C1 depends on the parameters of the twelfth resistor R12 x the first capacitor C1. Because the charging time of the first capacitor C1 is much shorter than its discharge time, when the frequency of the data transmission signal of the main control chip MCU is sufficiently high (greater than 1 / (2π x the twelfth resistor R12 x the first capacitor C1)), the voltage on the first capacitor C1 generally remains high, resulting in a high level on the room temperature control detection RMS port of the main control chip MCU.

[0025] In the OT communication / room temperature control interface circuit, the first interface OT-RM1 and the second interface OT-RM2 are used to connect to the OT communication module or the passive switch type room temperature controller. The second switching diode D2 and the third switching diode D3 are used to clamp the voltage of the interface signal to limit the signal voltage between zero level and 24V; the fourth non-polar capacitor C4 is used to filter and decouple the signal.

[0026] This circuit can optionally connect to an OT communication module that complies with the EU OpenTherm protocol through the first interface OT-RM1 and the second interface OT-RM2. Through it, full-function operation of the devices in the smart home system can be realized, including power on and off, timing and temperature setting, etc., and the system operation status and fault information can be displayed. At the same time, a passive switch-type room temperature controller can also be optionally connected through this interface, through which the home heating equipment can be turned on and off instantly and on a scheduled basis.

[0027] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An OT communication and room temperature control interface detection circuit, including a main control chip MCU, characterized by: It also includes an OT communication data sending circuit, an OT communication data receiving circuit, a room temperature controller detection circuit and an OT communication room temperature control interface. The OT-TX end of the main control chip MCU is connected to the OT communication data sending circuit, the RMS end of the main control chip MCU is connected to the room temperature controller detection circuit, the OT-RX OT end of the main control chip MCU is connected to the OT communication data receiving circuit, the room temperature controller detection circuit detects the OT communication data sending circuit and the OT communication data receiving circuit respectively, the OT communication data sending circuit and the OT communication data receiving circuit are respectively connected to the OT communication room temperature control interface, and the OT communication room temperature control interface is connected to an OT communication module or a passive switch type room temperature controller.

2. The OT communication and room temperature control interface detection circuit according to claim 1, characterized in that: The OT communication data sending circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first NPN switch type transistor Q1 and a second PNP switch type transistor Q2, the first resistor R1 is connected to the base of the first NPN switch type transistor Q1, the common end between the first resistor R1 and the base of the first NPN switch type transistor Q1 is connected to the second resistor R2, the fourth resistor R4 is connected to the emitter of the first NPN switch type transistor Q1, the first NPN switch type transistor Q1 is connected to the emitter of the first NPN switch type transistor Q1, and the first NPN switch type transistor Q2 is connected to the emitter of the first NPN switch type transistor Q1. The collector of transistor Q1 is connected to the base of the second PNP switch-type transistor Q2. The common end between the collector of the first NPN switch-type transistor Q1 and the base of the second PNP switch-type transistor Q2 is connected to the third resistor R3. The fifth resistor R5 is connected to the emitter of the second PNP switch-type transistor Q2. The other end of the fifth resistor R5 is connected to the other end of the third resistor R3. The common end between the fifth resistor R5 and the third resistor R3 is connected to a 24V power supply terminal. The sixth resistor R6 is connected to the collector of the second PNP switch-type transistor Q2.

3. The OT communication and room temperature control interface detection circuit according to claim 1, characterized in that: The OT communication data receiving circuit includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first non-polar capacitor C1, a second non-polar capacitor C2, a first voltage-stabilizing diode D1 and a third NPN switch-type transistor Q3; the seventh resistor R7 is connected to the collector of the third NPN switch-type transistor Q3, and the common end between the seventh resistor R7 and the collector of the third NPN switch-type transistor Q3 is respectively connected to the eighth resistor R8 and the first non-polar capacitor C1, the other end of the eighth resistor R8 is connected to the 5V power supply end, the second non-polar capacitor C2 and the ninth resistor R9 are connected in parallel, one common end of the second non-polar capacitor C2 and the ninth resistor R9 is connected to the base of the third NPN switch-type transistor Q3, the other common end of the second non-polar capacitor C2 and the ninth resistor R9 is connected to the emitter of the third NPN switch-type transistor Q3, and one common end of the second non-polar capacitor C2 and the ninth resistor R9 is also connected to the tenth resistor R10.

4. The OT communication and room temperature control interface detection circuit according to claim 1, characterized in that: The room temperature controller detection circuit includes an eleventh resistor R11, a twelfth resistor R12, a third electrolytic capacitor C3, and a fourth PNP switch-type transistor Q4; the eleventh resistor R11 and the base of the fourth PNP switch-type transistor Q4, the twelfth resistor R12 and the third electrolytic capacitor C3 are respectively connected to the collector of the fourth PNP switch-type transistor Q4, the other end of the eleventh resistor R11 is connected to the OT communication data receiving circuit, and the emitter of the fourth PNP switch-type transistor Q4 is connected to the OT communication data sending circuit.

5. The OT communication and room temperature control interface detection circuit according to claim 1, characterized in that: The OT communication room temperature control interface circuit includes a first interface OT-RM1 and a second interface OT-RM2 of a second switching diode D2, a third switching diode D3, and a fourth polar capacitor C4. The second switching diode D2, the third switching diode D3, and one end of the fourth polar capacitor C4 are connected. The common end between the second switching diode D2, the third switching diode D3, and the fourth polar capacitor C4 is connected to the first interface OT-RM1, and the other end of the fourth polar capacitor C4 is connected to the second interface OT-RM2.

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