Power supply sampling circuit, power supply control method, drive-by-wire controller and multi-connected system

Abstract

The application relates to a power supply sampling circuit, a power supply control method, a drive-by-wire controller and a multi-connected system. The power supply sampling circuit comprises a differential amplifier, a first power supply communication bus connected with a negative electrode of the differential amplifier and a second power supply communication bus connected with a positive electrode of the differential amplifier, a sampling resistor arranged between the first power supply communication bus and the second power supply communication bus, and a sampling voltage output from an output end of the differential amplifier. The sampling voltage of each indoor unit is calculated according to the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the drive-by-wire controller. Since the sampling voltage is related to the internal resistance of the power supply communication bus, the sampling voltage can be used to represent the line energy consumption. According to the application, the power supply sequence is determined according to the line energy consumption, the line loss minimization is realized, and the power supply efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of multi-split air conditioning technology, specifically relating to a power supply sampling circuit, a power supply control method, a wired controller, and a multi-split air conditioning system. Background Technology

[0002] In multi-split air conditioning systems, the wired controller needs to communicate with the indoor units, and the wired controller also needs the indoor units to supply power. Therefore, current communication systems between indoor units and wired controllers in multi-split units mostly use HBS (Home Bus System). This communication system uses differential-mode inductors and coupling capacitors to separate the DC power supply and the communication carrier, thus achieving integration of the communication and power supply lines. When using HBS communication, because it uses DC power, the loss on the communication line increases when the communication system is large. To ensure that only one indoor unit supplies power to the wired controller, the traditional wired controller power supply control method is to preset the power supply order of each indoor unit according to its address. The wired controller performs a delayed power-on based on the unique address of each indoor unit to ensure that only one indoor unit supplies power to the wired controller at a time. However, since the power supply address order is factory default, the indoor unit selected based on the power supply address may be very close to the wired controller or very far away. If the indoor unit is far from the wired controller, the line loss will increase significantly, leading to a decrease in power supply efficiency. Summary of the Invention

[0003] To at least partially overcome the problem that traditional wired controller power supply control methods, which preset the power supply sequence of each indoor unit based on its address, cause line losses to be affected by the distance between the powered indoor unit and the wired controller, resulting in unreliable power supply efficiency, this application provides a power supply sampling circuit, a power supply control method, a wired controller, and a multi-unit air conditioning system.

[0004] In a first aspect, this application provides a power supply sampling circuit, including:

[0005] Differential amplifier;

[0006] A first power supply communication bus connected to the negative terminal of the differential amplifier and a second power supply communication bus connected to the positive terminal of the differential amplifier;

[0007] A sampling resistor is disposed between the first power supply communication bus and the second power supply communication bus, and the sampling resistor is used to connect the first power supply communication bus and the second power supply communication bus.

[0008] The differential amplifier outputs a sampling voltage, and the sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller.

[0009] Furthermore, it also includes a first feedback resistor and a second feedback resistor, the resistance values ​​of which are used to calculate the amplification factor of the differential amplifier, wherein:

[0010] The first feedback resistor is disposed between the negative terminal of the differential amplifier and the output terminal of the differential amplifier;

[0011] The second feedback resistor is set on the first power supply communication bus connected to the negative terminal of the differential amplifier.

[0012] Furthermore, it also includes bias resistors:

[0013] One end of the bias resistor is connected to the positive terminal of the differential amplifier, and the other end of the bias resistor is used to apply a bias voltage.

[0014] Furthermore, the sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller, including:

[0015] The sampling voltage VO = VZ + (R1 / R2*VI), where VZ is the bias voltage, R1 is the first feedback resistor, R2 is the second feedback resistor, and VI is the voltage across the sampling resistor.

[0016] VI = (R4 / (2R+R4))*V, where V is the AC component in the first power supply communication bus and the second power supply communication bus, R4 is the sampling resistor, and R is the internal resistance of the power supply communication bus.

[0017] R = Lρ / S, where L is the length of the power supply and communication bus, ρ is the wire density, and S is the cross-sectional area of ​​the power supply and communication bus.

[0018] Furthermore, it also includes a first coupling capacitor and a second coupling capacitor.

[0019] The first coupling capacitor is used to filter out the DC component in the first power supply communication bus;

[0020] The second coupling capacitor is used to filter out the DC component in the second power supply communication bus.

[0021] Furthermore, it also includes attenuation resistors.

[0022] The attenuation resistor is placed between the second coupling capacitor and the positive terminal of the differential amplifier to attenuate the AC component in the second power supply communication bus.

[0023] Furthermore, the second feedback resistor is disposed between the first coupling capacitor and the negative terminal of the differential amplifier, and is also used to attenuate the AC component in the first power supply communication bus.

[0024] Furthermore, the resistance value of the second feedback resistor is equal to the resistance value of the attenuation resistor; the resistance value of the first feedback resistor is equal to the resistance value of the bias resistor.

[0025] Secondly, this application provides a power supply control method, including:

[0026] The sampling voltage is obtained through the power supply sampling circuit as described in the first aspect;

[0027] The energy consumption priority of each indoor unit is determined based on the sampling voltage corresponding to each indoor unit;

[0028] The power supply sequence of each indoor unit is determined based on its energy consumption priority.

[0029] Furthermore, determining the energy consumption priority of each indoor unit based on the sampling voltage corresponding to each indoor unit includes:

[0030] The indoor unit with a higher sampling voltage has a higher energy consumption priority than the indoor unit with a lower sampling voltage.

[0031] Furthermore, before acquiring the sampling voltage, the following steps are also included:

[0032] When the system is powered on, the indoor unit with the higher address priority is selected as the power supply indoor unit according to the preset address priority.

[0033] Furthermore, after determining the power supply sequence for each indoor unit, the process also includes:

[0034] The power consumption priority is sent back to each indoor unit, and each indoor unit stores the power supply priority in the non-erasable area of ​​the control chip when it is powered off.

[0035] When the system is powered on again, select the indoor unit with the highest energy consumption priority as the indoor unit to be powered.

[0036] Thirdly, this application provides a wired remote control, comprising:

[0037] The power supply sampling circuit as described in the first aspect.

[0038] Fourthly, this application provides a multi-unit system, comprising:

[0039] As described in the third aspect, a wired controller and at least two indoor units;

[0040] The wired controller selects the power supply unit based on the sampling voltage output by the power supply sampling circuit.

[0041] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0042] The power supply sampling circuit, power supply control method, wired controller, and multi-unit system provided in this invention include a differential amplifier; a first power supply communication bus connected to the negative terminal of the differential amplifier and a second power supply communication bus connected to the positive terminal of the differential amplifier; a sampling resistor disposed between the first power supply communication bus and the second power supply communication bus; and a sampling voltage output from the output terminal of the differential amplifier. The sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller. Since the sampling voltage is related to the internal resistance of the power supply communication bus, it can be used to characterize the line energy consumption, determine the power supply sequence based on the line energy consumption, minimize line loss, and improve power supply efficiency.

[0043] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0045] Figure 1 This is a circuit diagram of a power supply sampling circuit provided in one embodiment of this application.

[0046] Figure 2 This is a flowchart of a power supply control method provided in one embodiment of this application.

[0047] Figure 3 This is a functional structure diagram of a multi-unit system provided in one embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Figure 1 This is a functional structure diagram of a power supply sampling circuit provided in one embodiment of this application, as shown below. Figure 1 As shown, the power supply sampling circuit includes:

[0050] Differential amplifier U;

[0051] A first power supply communication bus P1 connected to the negative terminal of the differential amplifier U and a second power supply communication bus P2 connected to the positive terminal of the differential amplifier U;

[0052] The sampling resistor R4 is set between the first power supply communication bus P1 and the second power supply communication bus P2. The sampling resistor R4 is used to connect the first power supply communication bus P1 and the second power supply communication bus P2.

[0053] The differential amplifier U outputs a sampling voltage. The sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor R4 and the internal resistance of the power supply communication bus between the indoor unit and the wired controller.

[0054] Traditional wired controller power supply control methods preset the power supply sequence of each indoor unit based on its address. The wired controller performs a delayed power-on based on the unique address of each indoor unit to ensure that only one indoor unit supplies power to the wired controller at a time. However, since the power supply address sequence is factory default, the indoor unit selected based on the power supply address may be very close to the power receiving wired controller or very far away. If the indoor unit is far away from the wired controller, the line loss will increase significantly, resulting in reduced power supply efficiency.

[0055] In this embodiment, the power supply sampling circuit includes a differential amplifier; a first power supply communication bus connected to the negative terminal of the differential amplifier and a second power supply communication bus connected to the positive terminal of the differential amplifier; a sampling resistor disposed between the first power supply communication bus and the second power supply communication bus; and a sampling voltage output from the output terminal of the differential amplifier. The sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller. Since the sampling voltage is related to the internal resistance of the power supply communication bus, it can be used to characterize the line energy consumption. The power supply sequence is determined based on the line energy consumption to minimize line loss and improve power supply efficiency.

[0056] like Figure 1 As shown, based on the previous embodiment, the power supply sampling circuit further includes:

[0057] The first feedback resistor R1 and the second feedback resistor R2 are used to calculate the amplification factor of the differential amplifier, where:

[0058] The first feedback resistor R1 is set between the negative terminal of the differential amplifier U and the output terminal of the differential amplifier U;

[0059] The second feedback resistor R2 is set on the first power supply communication bus P1, which is connected to the negative terminal of the differential amplifier U.

[0060] R1 and R2 form a feedback network that determines the amplification factor, which is R1 / R2.

[0061] The bias resistor R3 is connected at one end to the positive terminal of the differential amplifier U, and at the other end to the bias voltage VZ.

[0062] Since the chip can only sample positive voltage values, while the carrier signal is an alternating positive and negative signal, a bias voltage VZ is applied to ensure that the chip can sample normally. When the carrier signal is negative, the bias voltage VZ is used to compensate for the negative value, thereby ensuring that the carrier signal can be sampled normally whether it is in positive or negative phase.

[0063] First coupling capacitor C1 and second coupling capacitor C2, the first coupling capacitor C1 is used to filter out the DC component in the first power supply communication bus P1.

[0064] The second coupling capacitor C2 is used to filter out the DC component in the second power supply communication bus P2.

[0065] Filtering out the DC components of P1 and P2 facilitates the analysis of the AC components and carrier signals.

[0066] The attenuation resistor R6 is placed between the second coupling capacitor C2 and the positive terminal of the differential amplifier U, and is used to attenuate the AC component in the second power supply communication bus P2.

[0067] The second feedback resistor R2 is located between the first coupling capacitor C1 and the negative terminal of the differential amplifier U, and is also used to attenuate the AC component in the first power supply communication bus P1.

[0068] The voltage across R4 is the AC component VI of P1 and P2, which is attenuated by R2 and R6 and then input to the integrated operational amplifier U12-D for differential amplification.

[0069] The sampling resistor R4 is positioned between the first coupling capacitor C1 and the second feedback resistor R2, and before the attenuation resistor R6.

[0070] In some embodiments, the resistance value of the second feedback resistor R2 is equal to the resistance value of the attenuation resistor R6; the resistance value of the first feedback resistor R1 is equal to the resistance value of the bias resistor R3, which can ensure common-mode suppression.

[0071] The sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller, including:

[0072] The sampling voltage VO = VZ + (R1 / R2*VI), where VZ is the bias voltage, R1 is the first feedback resistor, R2 is the second feedback resistor, and VI is the voltage across the sampling resistor.

[0073] VI = (R4 / (2R+R4))*V, where V is the AC component in the first power supply communication bus P1 and the second power supply communication bus P2, R4 is the sampling resistor, and R is the internal resistance of the power supply communication bus.

[0074] R = Lρ / S, where L is the length of the power supply and communication bus, ρ is the wire density, and S is the cross-sectional area of ​​the power supply and communication bus.

[0075] The amplitude of VI represents the strength of the communication carrier signal. VO is positively correlated with VI, so VO can represent the strength of the communication carrier signal. VI is negatively correlated with line loss, which is related to the internal resistance R of the communication line. Therefore, VO is a function of the communication line length L and is negatively correlated with L.

[0076] In this embodiment, after the system powers on, the wired controller receives preset adjustment signals from each indoor unit. These signals contain unique address information for each indoor unit. The wired controller analyzes the received adjustment signals, prioritizing the energy consumption of each indoor unit based on the signal amplitude representing the voltage VO, with a higher VO amplitude indicating higher priority. The wired controller sends this priority information back to each indoor unit. Upon receiving the feedback, each indoor unit filters and selects its priority, storing this information in the non-erasable area of ​​the communication chip after power loss. During the next power-on competition, an energy consumption priority judgment condition is added, completing the debugging process. Upon the next power-on, each indoor unit will prioritize powering the unit with the highest energy consumption priority and the shortest power supply line (based on address priority competition) based on its energy consumption priority.

[0077] In this embodiment, communication line loss characteristics parameters are collected. With the aim of minimizing line loss, the most suitable power supply control for the communication system between the indoor unit and the wired controller is selected, which reduces the requirements for the power supply drive capability and improves power supply efficiency.

[0078] Figure 2 A flowchart of a power supply control method provided in one embodiment of this application is shown below. Figure 2 As shown, the power supply control method includes:

[0079] S21: Obtain the sampling voltage through the power supply sampling circuit as described in the above embodiment;

[0080] S22: Determine the energy consumption priority of each indoor unit based on the sampling voltage corresponding to each indoor unit;

[0081] S23: Determine the power supply sequence of each indoor unit according to the energy consumption priority of each indoor unit.

[0082] In some embodiments, the energy consumption priority of each indoor unit is determined based on the sampling voltage corresponding to each indoor unit, including:

[0083] The indoor unit with a higher sampling voltage has a higher energy consumption priority than the indoor unit with a lower sampling voltage.

[0084] In some embodiments, before acquiring the sampling voltage, the following steps are also included:

[0085] When the system is powered on, the indoor unit with the higher address priority is selected as the power supply indoor unit according to the preset address priority.

[0086] In some embodiments, after determining the power supply sequence of each indoor unit, the method further includes:

[0087] The power consumption priority is sent back to each indoor unit, and each indoor unit stores the power supply priority in the non-erasable area of ​​the control chip when it is powered off.

[0088] When the system is powered on again, select the indoor unit with the highest energy consumption priority as the indoor unit to be powered.

[0089] This application provides a wired controller, including:

[0090] The power supply sampling circuit as described in the above embodiments.

[0091] Figure 3 A functional structure diagram of a multi-unit system provided in one embodiment of this application is shown below. Figure 3 As shown, the multi-split air conditioning system includes:

[0092] The wired controller and at least two indoor units as described in the above embodiments;

[0093] The wired controller selects the power supply unit for the indoor unit based on the sampling voltage output by the power supply sampling circuit.

[0094] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0095] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0096] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0097] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0098] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0099] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0100] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0102] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0103] It should be noted that the present invention is not limited to the above-described preferred embodiments. Those skilled in the art can derive other forms of products under the guidance of the present invention. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to that of the present application falls within the protection scope of the present invention.

Claims

1. A power supply sampling circuit, characterized in that, include: Differential amplifier; A first power supply communication bus connected to the negative terminal of the differential amplifier and a second power supply communication bus connected to the positive terminal of the differential amplifier; A sampling resistor is disposed between the first power supply communication bus and the second power supply communication bus, and the sampling resistor is used to connect the first power supply communication bus and the second power supply communication bus. The differential amplifier outputs a sampling voltage, and the sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller.

2. The power supply sampling circuit according to claim 1, characterized in that, It also includes a first feedback resistor and a second feedback resistor, the values ​​of which are used to calculate the gain of the differential amplifier, wherein: The first feedback resistor is disposed between the negative terminal of the differential amplifier and the output terminal of the differential amplifier; The second feedback resistor is set on the first power supply communication bus connected to the negative terminal of the differential amplifier.

3. The power supply sampling circuit according to claim 2, characterized in that, It also includes bias resistors: One end of the bias resistor is connected to the positive terminal of the differential amplifier, and the other end of the bias resistor is used to apply a bias voltage.

4. The power supply sampling circuit according to claim 3, characterized in that, The sampling voltage of each indoor unit is calculated based on the resistance value of the sampling resistor and the internal resistance of the power supply communication bus between the indoor unit and the wired controller, including: The sampling voltage VO = VZ + (R1 / R2*VI), where VZ is the bias voltage, R1 is the first feedback resistor, R2 is the second feedback resistor, and VI is the voltage across the sampling resistor. VI = (R4 / (2R+R4))*V, where V is the AC component in the first power supply communication bus and the second power supply communication bus, R4 is the sampling resistor, and R is the internal resistance of the power supply communication bus. R = Lρ / S, where L is the length of the power supply and communication bus, ρ is the wire density, and S is the cross-sectional area of ​​the power supply and communication bus.

5. The power supply sampling circuit according to claim 3, characterized in that, It also includes a first coupling capacitor and a second coupling capacitor. The first coupling capacitor is used to filter out the DC component in the first power supply communication bus; The second coupling capacitor is used to filter out the DC component in the second power supply communication bus.

6. The power supply sampling circuit according to claim 5, characterized in that, It also includes attenuation resistors, The attenuation resistor is placed between the second coupling capacitor and the positive terminal of the differential amplifier to attenuate the AC component in the second power supply communication bus.

7. The power supply sampling circuit according to claim 5, characterized in that, The second feedback resistor is disposed between the first coupling capacitor and the negative terminal of the differential amplifier, and is also used to attenuate the AC component in the first power supply communication bus.

8. The power supply sampling circuit according to claim 6, characterized in that, The resistance value of the second feedback resistor is equal to the resistance value of the attenuation resistor; The resistance value of the first feedback resistor is equal to the resistance value of the bias resistor.

9. A power supply control method, characterized in that, include: The sampling voltage is obtained by the power supply sampling circuit as described in any one of claims 1 to 8; The energy consumption priority of each indoor unit is determined based on the sampling voltage corresponding to each indoor unit; The power supply sequence of each indoor unit is determined based on its energy consumption priority.

10. The power supply control method according to claim 9, characterized in that, The step of determining the energy consumption priority of each indoor unit based on the sampling voltage corresponding to each indoor unit includes: The indoor unit with a higher sampling voltage has a higher energy consumption priority than the indoor unit with a lower sampling voltage.

11. The power supply control method according to claim 9, characterized in that, Before acquiring the sampling voltage, the following steps are also included: When the system is powered on, the indoor unit with the higher address priority is selected as the power supply indoor unit according to the preset address priority.

12. The power supply control method according to claim 9, characterized in that, After determining the power supply sequence for each indoor unit, the following is also included: The power consumption priority is sent back to each indoor unit, and each indoor unit stores the power supply priority in the non-erasable area of ​​the control chip when it is powered off. When the system is powered on again, select the indoor unit with the highest energy consumption priority as the indoor unit to be powered.

13. A wired controller, characterized in that, include: The power supply sampling circuit as described in any one of claims 1 to 8.

14. A multi-split air conditioning system, characterized in that, include: The wired controller and at least two indoor units as described in claim 13; The wired controller selects the power supply unit based on the sampling voltage output by the power supply sampling circuit.

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