CN114963409B

CN114963409B - Communication power supply circuit, control method, device, storage medium and air conditioning equipment

Info

Publication number: CN114963409B
Application number: CN202210671688.0A
Authority: CN
Inventors: 孙良伟; 梅利军; 陈家朗; 王晨; 吴田; 陈续朗
Original assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Current assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2024-06-11
Anticipated expiration: 2042-06-15
Also published as: CN114963409A; WO2023241199A1

Abstract

The application provides a communication power supply circuit, a control method, a device, a storage medium and air conditioning equipment. The communication power supply circuit is used for the air conditioner, the air conditioner comprises an indoor unit and an outdoor unit, the indoor unit and the outdoor unit are connected through a communication bus, and the communication power supply circuit comprises: the modulation module is connected with the communication bus and used for generating a first electric signal, and the first electric signal is used for supplying power and transmitting communication signals; and the controller is connected with the communication bus and is used for determining corresponding fault information according to the comparison result of the voltage value of the first electric signal and the preset threshold value. The application can judge whether the communication bus has the overcurrent fault caused by short circuit and misconnection, and give out prompt or automatically execute the fault removing operation when the overcurrent fault occurs, thereby avoiding damaging the components of weak current load, reducing the combustion risk and further improving the operation reliability and safety of the air conditioning equipment.

Description

Communication power supply circuit, control method, device, storage medium and air conditioning equipment

Technical Field

The invention relates to the technical field of air conditioner power supply, in particular to a communication power supply circuit, a control method, a device, a storage medium and air conditioner equipment.

Background

In the related art, a weak current load of an indoor unit of an air conditioner, such as an electronic expansion valve, needs to convert a strong electric signal into a weak electric signal through a switching circuit and then supply power. When the indoor unit is powered off, the strong current power supply signal is disconnected, and the weak current load is powered off as well, so that the electronic expansion valve cannot be closed in time.

If the power is supplied through the communication bus, direct-current voltage needs to be increased on the communication bus, and if faults such as overcurrent occur, components of weak-current loads can be damaged, so that combustion risks are caused.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the invention proposes a communication power supply circuit.

A second aspect of the invention proposes a control method.

A third aspect of the present invention proposes a control device.

A fourth aspect of the present invention proposes a control device.

A fifth aspect of the present invention proposes a readable storage medium.

A sixth aspect of the present invention proposes an air conditioning apparatus.

In view of this, a first aspect of the present invention provides a communication power supply circuit for an air conditioner including an indoor unit and an outdoor unit connected by a communication bus, the communication power supply circuit comprising: the modulation module is connected with the communication bus and used for generating a first electric signal, and the first electric signal is used for supplying power and transmitting communication signals; and the controller is connected with the communication bus and is used for determining corresponding fault information according to the comparison result of the voltage value of the first electric signal and the preset threshold value.

In the technical scheme, the outdoor unit and the indoor unit of the air conditioning equipment are in signal communication through a communication bus. Meanwhile, the communication bus carries a direct current power supply signal, such as a 24V direct current power supply signal, and the power supply signal can supply power to a weak current load of the indoor unit, wherein the weak current load comprises a wire controller, a relay, an electronic expansion valve, a display panel, a processor (MCU, micro Controller Unit micro-control unit), a temperature sensor, a water level sensor and the like.

The communication power supply circuit comprises a modulation module, the modulation module is connected with the communication bus, in some embodiments, the modulation module comprises a communication chip and a switching tube, wherein the communication chip can be an MDV-Link chip, the switching tube can be a MOS tube (Metal-Oxide-Semiconductor Field-EFFECT TRANSISTER, metal-Oxide semiconductor field effect transistor), a MOS tube driving circuit is arranged between the communication chip and the switching tube, and the communication chip drives the switching tube to switch the state through controlling the driving circuit, so that the electric signal on the communication bus is modulated, and the specific modulation is formed into a readable wide voltage signal, namely the first electric signal.

After the wide voltage signals are received by the indoor unit, one part of the wide voltage signals are converted into stable direct current power supply signals through a power supply circuit, and the stable direct current power supply signals are used for supplying power to weak current loads of the indoor unit. The other part is demodulated by the demodulation module to obtain the communication signal carried in the demodulation module, thereby realizing the communication between each part and each module of the outdoor unit and the indoor unit.

The communication control circuit further comprises a controller which is connected with the communication bus and can collect the voltage value of the first electric signal on the communication bus and dynamically compare the voltage value of the first electric signal with the magnitude relation of a preset threshold value.

If the voltage value of the first electric signal is not greater than the preset first threshold value, the first electric signal on the communication bus is considered to not cause fault or overcurrent risk, and the safety requirement of long-term operation can be met.

And if the voltage value of the first electric signal is larger than a preset first threshold value, judging that the overcurrent risk exists on the communication bus. At this time, the operation state of the indoor unit of the air conditioning apparatus is further acquired. It will be appreciated that an air conditioning apparatus may have one indoor unit or may have a plurality of indoor units.

Specifically, whether the running state of the indoor unit is a power-down state is judged, wherein the power-down state refers to a state that the indoor unit is disconnected from a power supply source, such as a mains supply. When the indoor unit is powered down, the indoor unit needs to be powered on through the communication bus, so that weak current load of the indoor unit, such as the electronic expansion valve, can be normally closed to prevent the hydraulic impact fault of the compressor, therefore, continuous power supply current can exist on the communication bus, and the over-current fault of the communication bus is not identified when the running state of the indoor unit is the power-down state in order to avoid the over-current fault caused by mistaken identification of the normal power supply current as a pipeline or a misconnection wire core.

If the running state of the indoor unit is judged not to be the power-down state, namely the indoor unit is normally connected with the power supply, when the voltage value corresponding to the first electric signal is recognized to be larger than the first threshold value, the communication bus is judged to have faults, the fault information is specifically an overcurrent fault, and a user is prompted to timely process the faults, such as the overcurrent fault AA, so that the user can conveniently inquire the details of the faults and timely remove the faults.

In some embodiments, in the event of a determination that an over-current fault has occurred on the communication bus, an emergency shutdown or adjustment of the voltage on the communication bus may also be performed to attempt to automatically troubleshoot the fault.

According to the embodiment of the application, the communication bus of the air conditioning equipment is used for supplying power to the weak current load of the indoor unit, so that the normal communication requirement is ensured, the wiring layout of the power lines of the indoor unit and the outdoor unit is simplified, the cable cost is reduced, and when the indoor unit is powered down, the components such as the main control board, the electronic expansion valve and the like can still be powered up through the communication bus, so that the electronic expansion valve can be closed at the first time after the indoor unit is powered down, the refrigerant pipeline of the powered down indoor unit is cut off, the phenomena of liquid impact, condensation water dripping and the like of the compressor are avoided, and the reliability of the air conditioning equipment is improved.

Meanwhile, the voltage value of the wide voltage signal (namely the first electric signal) on the communication bus is acquired in real time through the controller, whether the communication bus has an overcurrent fault caused by short circuit and misconnection or not is judged according to the voltage value of the first electric signal and the magnitude relation of a preset threshold, and prompt or automatic fault removal operation is sent out when the overcurrent fault occurs, so that the damage to components of weak current loads is avoided, the combustion risk is reduced, and the running reliability and safety of air conditioning equipment are further improved.

In addition, the communication power supply circuit in the technical scheme provided by the invention can also have the following additional technical characteristics:

in the above technical solution, the communication power supply circuit further includes: the power module is connected with the communication bus and is used for outputting a second electric signal to the communication bus; the modulation module is used for modulating the second electric signal to obtain the first electric signal.

In the technical scheme, a power module is arranged in the communication power supply circuit, and the power module can supply power to the communication bus through a mode of outputting a second electric signal. The voltage of the second electric signal is adjustable, if the power supply module is set to output 24V electric signals, the communication bus carries 24V direct current signals, if the power supply module is set to output 16V electric signals, the communication bus carries 16V direct current signals.

The modulation module is capable of modulating the second electrical signal such that the second electrical signal is modulated into a wide voltage signal that can be used simultaneously to transmit the communication signal and to power the weak electrical load. Specifically, the modulation module includes a communication chip and a switching tube, where the communication chip may be an MDV-Link chip, and the communication chip drives the switching tube to switch the switching state by controlling the driving circuit, so as to modulate an electrical signal on the communication bus, and specifically modulate the electrical signal to form a readable wide voltage signal, that is, the first electrical signal.

The first signal can be received by a current module of the indoor unit, one part of the first signal is converted into a stable direct current power supply signal through a power supply circuit to supply power to a weak current load, and the other part of the first signal is demodulated and restored into a communication signal through a demodulation module, so that communication among all components and all modules is realized.

In any of the above solutions, the communication power supply circuit further includes: and the sampling module is connected with the communication bus and the controller and is used for acquiring the voltage value.

In the technical scheme, a sampling module is arranged in a communication power supply circuit, a sampling end of the sampling module is connected with a communication bus and used for acquiring a sampling signal of a first electric signal, and an output end of the sampling module is connected with a controller, so that the processed sampling signal is sent to the controller, the controller determines a real-time voltage value of the first electric signal according to the processed sampling signal, judges whether an overcurrent fault caused by short circuit, misconnection and the like occurs on the communication bus based on a comparison result of a preset threshold value and the real-time voltage value of the first electric signal, and sends prompt information when judging the overcurrent fault, and controls to close the communication bus, thereby avoiding damaging components of a weak current load, reducing combustion risk and improving the reliability and safety of operation of air conditioning equipment.

In any of the above solutions, the sampling module includes: the first resistor is arranged on the communication bus, and the first end of the first resistor is connected with the modulation module; and the input end of the operational amplifier module is connected with the first resistor, and the output end of the operational amplifier module is connected with the controller.

In the technical scheme, a first resistor and an operational amplifier module are arranged in the sampling module, wherein the first resistor is a sampling resistor and is specifically arranged on the communication bus, and the first resistor is specifically arranged in the downlink direction of the modulation module, so that the first resistor actually samples the voltage value of the first electric signal modulated by the modulation module.

The input end of the operational amplifier module is connected with the first resistor, the operational amplifier module can amplify the first electric signal sampled by the first resistor to a proper electric signal which can be identified by the controller according to the proportion of the operational amplifier module and the resistance value of the first resistor, the controller calculates the accurate voltage value of the first electric signal, and judges whether the communication bus has overcurrent faults or not based on the comparison result of the preset threshold value and the real-time voltage value of the first electric signal.

The operational amplifier module may be specifically configured as a high common mode operational amplifier device (also referred to as a high-side sampling operational amplifier device).

The first electric signal is sampled through the first resistor, and the sampled signal is subjected to operational amplification through the operational amplifier module, so that the sampling efficiency and the sampling precision can be effectively improved.

In any of the above solutions, the sampling module further includes: the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the positive electrode of the input end of the operational amplifier module; and the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the negative electrode of the input end of the operational amplifier module.

In the technical scheme, a second resistor and a third resistor are further arranged in the sampling module. The second resistor is connected in series with the positive electrode of the input end of the operational amplifier module and the first end of the first resistor, the third resistor is connected in series with the negative electrode of the input end of the operational amplifier module and the second end of the first resistor, and the second resistor and the third resistor can reduce the voltage value and the voltage value of the sampling signal of the first resistor.

According to the embodiment of the application, the voltage value and the voltage value of the first electric signal can be reduced according to a certain proportion by arranging the first resistor, so that the controller is prevented from being damaged by an overcurrent signal or a surge signal, and the reliability and the safety of the communication power supply circuit can be improved.

In any of the above solutions, the sampling module further includes: and the first end of the capacitor is connected with the second end of the second resistor, and the second end of the capacitor is connected with the second end of the third resistor.

In the technical scheme, a capacitor is arranged in the sampling module, the capacitor is connected in parallel between an input positive electrode and an input negative electrode of the power amplification module, a first end of the capacitor is connected to a second end of the second resistor, and a second end of the capacitor is connected to a second end of the third resistor.

Through setting up the condenser, can be with the clutter filtering in the sampling signal of first resistance to improve the purity of sampling signal, consequently can improve the sampling accuracy to the voltage value of first electrical signal, just also can guarantee to judge whether short circuit, the accuracy of the overcurrent fault that misconnection led to appear on the communication bus, avoid damaging the components and parts of light current load, reduce the combustion risk, further improve reliability and the security of air conditioning equipment operation.

A second aspect of the present invention provides a control method for controlling a communication power supply circuit provided in any one of the above-mentioned aspects, the method comprising: acquiring a voltage value of a first electric signal; acquiring the running state of the indoor unit under the condition that the voltage value is larger than a first threshold value; and under the condition that the running state is a non-power-down state, determining the fault information of the communication bus as an overcurrent fault.

In the above technical solution, the communication power supply circuit includes a power module; after determining that the fault information of the communication bus is an overcurrent fault, the method further comprises: and controlling the modulation module to close the communication bus and controlling the power supply module to reduce the voltage value of the output second electric signal.

In the technical scheme, in order to ensure the safety of the communication power supply circuit and prevent the over-current fault from damaging components in the circuit, when the over-current fault is identified to exist on the communication bus, the modulation module can close the communication bus, and after the communication bus is closed, the communication bus does not supply power to the components, modules and the like on the link or send communication signals, so that the over-current fault can be prevented from damaging the components.

After the communication bus is closed, the power supply module is further controlled, so that the voltage value of the second electric signal output to the communication bus is reduced, namely the voltage value of the communication bus (namely the voltage value of the first electric signal) is reduced, and the impact current on the bus is reduced, thereby avoiding the over-current damage of the detection module caused by faults such as short circuit and the like, and ensuring the reliability and the safety of the communication power supply circuit.

In any of the above technical solutions, while controlling the modulation module to close the communication bus, the control method further includes: starting a first timer; under the condition that the first timing duration reaches the first timing duration, controlling the modulation module to start a communication bus; acquiring the voltage value of the first electric signal again; and under the condition that the voltage value is smaller than a second threshold value, determining that the overcurrent fault is relieved, wherein the second threshold value is smaller than the first threshold value.

In the technical scheme, after judging that the overcurrent fault exists on the communication bus, the system can automatically carry out recovery operation on the overcurrent fault through common sense. Specifically, when the communication bus is closed, the system automatically starts timing, records a first timing time length which is passed after the communication bus is closed, and judges whether the first timing time length reaches the first time length. The first time is mainly used for enabling the components affected by the overcurrent faults to have enough time for heat dissipation.

After the first time period passes, the components are fully cooled, the modulation module is controlled to restart the communication bus, and the current voltage value of the first electric signal is obtained again after the communication bus is started. If the real-time voltage value of the first electric signal is judged to be reduced, particularly to be smaller than a preset second threshold value, the overcurrent fault is judged to be relieved, and the system can normally operate.

The power module has reduced the voltage value of the second electric signal to the communication bus, so that the theoretical voltage value of the first electric signal is reduced synchronously, the current threshold of fault judgment is reduced, the error recognition of the current reduction caused by the voltage reduction as fault recovery by a system error can be avoided, and the reliability of fault judgment is improved.

If the voltage value of the first electric signal acquired again is not smaller than the second threshold value after the first time period is passed, determining that the overcurrent fault is not eliminated, controlling the modulation module to close the communication bus again at the moment, controlling the modulation module to open the communication bus again after the first time period is passed again, and judging whether the real-time voltage value of the first electric signal is smaller than the second threshold value again.

According to the embodiment of the application, the communication bus is closed/opened, whether the voltage value of the first electric signal is smaller than the second threshold value is judged, so that the automatic elimination of the overcurrent fault is attempted, and the first timing time length is set between the opening/closing of the communication bus, so that the components are fully cooled, and the reliability of fault recovery can be improved.

In any of the above technical solutions, the control method further includes: and controlling the air conditioning equipment to stop under the condition that the first timing duration reaches the second duration and the voltage value is larger than the second threshold value.

In the technical scheme, after judging that the overcurrent fault exists on the communication bus, the modulation module closes the communication bus, the system automatically starts timing, and the elapsed time after the overcurrent fault is detected, namely the first timing time, is recorded.

When the first time period reaches the second time period, the system judges that the overcurrent fault is not relieved after a plurality of attempts to open/close the communication bus, and the short circuit fault is not recovered. At the moment, the current overcurrent faults cannot be removed by means of opening/closing the communication bus, the system does not attempt to automatically process the faults any more, the control modulation module thoroughly turns off the communication bus, the voltage value of a first electric signal on the communication bus is not detected any more, meanwhile, the air conditioning equipment is controlled to be shut down integrally, the expansion of the overcurrent faults is avoided, the safety of all devices in the air conditioning equipment is guaranteed, and the reliability of the integral operation of the air conditioning equipment is guaranteed.

In any of the foregoing solutions, before acquiring the voltage value of the first electrical signal of the communication bus, the method further includes: responsive to an initialization signal of the controller, starting a second timer; under the condition that the second timing time length reaches the third time length, the modulation module is controlled to start the communication bus; and executing the step of acquiring the voltage value of the first electric signal under the condition that the second timing duration reaches the fourth duration.

In the technical scheme, after the air conditioning equipment is started, each control module and each functional module are initialized, the system automatically starts the second timing according to the signal of the initialization completion of the controller. Before the second timing duration does not reach the third duration, the system does not control the modulation module to start the communication bus. The third duration is specifically a duration for ensuring that the protection action of the switching power supply is completed, so that the third duration needs to be longer than the protection duration of the switching power supply in the air conditioning equipment, and therefore overcurrent protection and protection conflict of the switching power supply are prevented.

If the switching power supply performs the protection operation, the heat dissipation time of the heat generated by the impact current caused by the protection operation of the switching power supply can be provided, and the damage of the components connected to the communication bus caused by the impact current caused by the operation of the switching power supply can be prevented.

After the second time reaches the third time, judging that the protection of the switching power supply is finished, starting the communication bus at the moment, enabling the system to operate normally, enabling the power supply module to start outputting a second electric signal to the communication bus, enabling the modulation module to modulate the second electric signal, and obtaining a first electric signal with wide voltage, wherein the first electric signal is used for supplying power to weak current loads of the indoor units and transmitting communication signals.

And when the second time length further reaches the fourth time length, the sampling module starts to collect the voltage value of the first electric signal on the communication bus. The fourth time is used for avoiding the false recognition of the overcurrent faults caused by the impact current at the moment when the power module outputs the second electric signal to the communication bus, so that the false operation of the overcurrent protection can be effectively reduced, the reliability of the overcurrent protection is improved, and the running stability and reliability of the air conditioning equipment are improved.

A third aspect of the present invention provides a control device for controlling the communication power supply circuit provided in any one of the above-mentioned aspects, comprising: an acquisition module for: acquiring a voltage value of a first electric signal; acquiring the running state of the indoor unit under the condition that the voltage value is larger than a first threshold value; and the determining module is used for determining that the fault information of the communication bus is an overcurrent fault under the condition that the running state is a non-power-down state.

A fourth aspect of the present invention provides a control device for controlling the communication control circuit provided in any one of the above-mentioned aspects, comprising: a memory for storing programs or instructions; the processor is configured to implement the steps of the control method provided in any one of the above-mentioned technical solutions when executing the program or the instruction, so that the control device also includes all the beneficial effects of the control method provided in any one of the above-mentioned technical solutions, and is not repeated here for avoiding repetition.

A fifth aspect of the present invention provides a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the control method as provided in any of the above-mentioned aspects, and therefore, the readable storage medium also includes all the advantageous effects of the control method as provided in any of the above-mentioned aspects, and will not be repeated here.

A sixth aspect of the present invention provides an air conditioning apparatus comprising a communication power supply circuit as provided in any one of the above-described aspects; and a control device as provided in any one of the above-mentioned aspects; and/or a readable storage medium as provided in any of the above-mentioned technical solutions, so that the air conditioning apparatus also includes all the beneficial effects of the communication power supply circuit as provided in any of the above-mentioned technical solutions, the control device as provided in any of the above-mentioned technical solutions, and/or the readable storage medium as provided in any of the above-mentioned technical solutions, and is not repeated here for avoiding repetition.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 shows a block diagram of a communication power supply circuit according to an embodiment of the present invention;

FIG. 2 shows one of the flowcharts of the control method provided according to an embodiment of the present invention;

fig. 3 shows a block diagram of a control apparatus according to an embodiment of the present application;

Fig. 4 shows a second flowchart of a control method according to an embodiment of the invention.

Reference numerals:

100 communication power supply circuit, 102 modulation module, 104 controller, 106 power module, 108 sampling module, 1081 first resistor, 1082 operational amplifier module, 1083 second resistor, 1084 third resistor, 1085 capacitor.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

Communication power supply circuits, control methods, apparatuses, storage media, and air conditioning devices according to some embodiments of the present invention are described below with reference to fig. 1 to 4.

Example 1

In some embodiments of the present invention, there is provided a communication power supply circuit for an air conditioner including an indoor unit and an outdoor unit, the indoor unit and the outdoor unit being connected by a communication bus, fig. 1 shows a block diagram of the communication power supply circuit according to an embodiment of the present invention, and as shown in fig. 1, the communication power supply circuit 100 includes:

the modulation module 102 is connected with the communication bus and is used for generating a first electric signal, and the first electric signal is used for supplying power and transmitting communication signals; the controller 104 is connected to the communication bus, and is configured to determine corresponding fault information according to a comparison result between the voltage value of the first electrical signal and a preset threshold.

In the embodiment of the invention, the outdoor unit and the indoor unit of the air conditioning equipment are in signal communication through a communication bus. Meanwhile, the communication bus carries a direct current power supply signal, such as a 24V direct current power supply signal, and the power supply signal can supply power to a weak current load of the indoor unit, wherein the weak current load comprises a wire controller, a relay, an electronic expansion valve, a display panel, a processor (MCU, micro Controller Unit micro-control unit), a temperature sensor, a water level sensor and the like.

The communication power supply circuit 100 includes a modulation module 102, where the modulation module 102 is connected to a communication bus, and in some embodiments, the modulation module 102 includes a communication chip and a switching tube, where the communication chip may be an MDV-Link chip, the switching tube may be a MOS transistor (Metal-Oxide-Semiconductor Field-EFFECT TRANSISTER, a Metal-Oxide semiconductor field effect transistor), a MOS transistor driving circuit is disposed between the communication chip and the switching tube, and the communication chip drives the switching tube to switch the state by controlling the driving circuit, so that an electric signal on the communication bus is modulated, and the specific modulation is formed into a readable wide voltage signal, that is, the first electric signal.

The communication control circuit further comprises a controller 104, wherein the controller 104 is connected with the communication bus and can collect the voltage value of the first electric signal on the communication bus and dynamically compare the voltage value of the first electric signal with the magnitude relation of a preset threshold value.

Meanwhile, the voltage value of the wide voltage signal (namely the first electric signal) on the communication bus is acquired in real time through the controller 104, whether the over-current fault caused by short circuit and misconnection occurs on the communication bus is judged according to the voltage value of the first electric signal and the magnitude relation of a preset threshold value, and prompt or automatic fault removal operation is sent out when the over-current fault occurs, so that the damage to components of weak current loads is avoided, the combustion risk is reduced, and the running reliability and safety of the air conditioning equipment are further improved.

On the basis of any of the above embodiments, the communication power supply circuit 100 further includes: a power module 106 connected to the communication bus for outputting a second electrical signal to the communication bus; the modulation module 102 is configured to modulate the second electrical signal to obtain the first electrical signal.

In the embodiment of the present invention, the power supply module 106 is disposed in the communication power supply circuit 100, and the power supply module 106 can supply power to the communication bus by outputting the second electrical signal. The voltage of the second electrical signal is adjustable, for example, if the power module 106 is configured to output a 24V electrical signal, the communication bus carries a 24V dc signal, for example, if the power module 106 is configured to output a 16V electrical signal, the communication bus carries a 16V dc signal.

The modulation module 102 is capable of modulating the second electrical signal such that the second electrical signal is modulated into a wide voltage signal that can be used both for transmitting communication signals and for powering weak electrical loads. Specifically, the modulation module 102 includes a communication chip and a switching tube, where the communication chip may be an MDV-Link chip, and the communication chip drives the switching tube to switch the switching state by controlling the driving circuit, so as to modulate an electrical signal on the communication bus, and specifically modulate the electrical signal to form a readable wide voltage signal, that is, the first electrical signal.

On the basis of any of the above embodiments, the communication power supply circuit 100 further includes: the sampling module 108 is connected to the communication bus and the controller 104, and is used for acquiring a voltage value.

In the embodiment of the present invention, a sampling module 108 is disposed in the communication power supply circuit 100, a sampling end of the sampling module 108 is connected to the communication bus, and is used to obtain a sampling signal of the first electrical signal, an output end of the sampling module 108 is connected to the controller 104, so that the processed sampling signal is sent to the controller 104, so that the controller 104 determines a real-time voltage value of the first electrical signal according to the processed sampling signal, determines whether an overcurrent fault caused by a short circuit, a misconnection, etc. occurs on the communication bus based on a comparison result of a preset threshold value and the real-time voltage value of the first electrical signal, and sends a prompt message when the overcurrent fault is determined to occur, and controls to close the communication bus, thereby avoiding damaging components of a weak current load, reducing a combustion risk, and improving reliability and safety of operation of the air conditioner.

On the basis of any of the above embodiments, the sampling module 108 includes: a first resistor 1081 disposed on the communication bus, wherein a first end of the first resistor 1081 is connected to the modulation module 102; the input end of the operational amplifier module 1082 is connected to the first resistor 1081, and the output end of the operational amplifier module 1082 is connected to the controller 104.

In the embodiment of the present invention, the sampling module 108 is provided with a first resistor 1081 and an operational amplifier module 1082, wherein the first resistor 1081 is a sampling resistor, and is specifically disposed on the communication bus, and the first resistor 1081 is specifically disposed in the downlink direction of the modulation module 102, so that the first resistor 1081 actually samples the voltage value of the first electrical signal modulated by the modulation module 102.

The input end of the operational amplifier module 1082 is connected with the first resistor 1081, the operational amplifier module 1082 can amplify the first electrical signal sampled by the first resistor 1081 to a suitable electrical signal which can be identified by the controller 104 according to a proportion, and the controller 104 calculates an accurate voltage value of the first electrical signal according to the operational amplifier proportion of the operational amplifier module 1082 and the resistance value of the first resistor 1081, and judges whether the communication bus has an overcurrent fault based on a comparison result of a preset threshold value and a real-time voltage value of the first electrical signal.

The op-amp module 1082 may be specifically configured as a high common mode op-amp device (also referred to as a high-side sampling op-amp device).

The first resistor 1081 is arranged to sample the first electric signal, and the operational amplification module 1082 is arranged to amplify the sampled signal, so that the sampling efficiency and the sampling precision can be effectively improved.

On the basis of any of the above embodiments, the sampling module 108 further includes: a second resistor 1083, wherein a first end of the second resistor 1083 is connected to a first end of the first resistor 1081, and a second end of the second resistor 1083 is connected to an anode of the input end of the op-amp module 1082; and a third resistor 1084, wherein a first end of the third resistor 1084 is connected to a second end of the first resistor 1081, and a second end of the third resistor 1084 is connected to the negative electrode of the input end of the op-amp module 1082.

In an embodiment of the present invention, a second resistor 1083 and a third resistor 1084 are also provided in the sampling module 108. The second resistor 1083 is connected in series with the positive electrode of the input terminal of the op-amp module 1082 and the first terminal of the first resistor 1081, the third resistor 1084 is connected in series with the negative electrode of the input terminal of the op-amp module 1082 and the second terminal of the first resistor 1081, and the second resistor 1083 and the third resistor 1084 can reduce the voltage value and the voltage value of the sampling signal of the first resistor 1081.

By arranging the first resistor 1081, the voltage value and the voltage value of the first electric signal can be reduced according to a certain proportion, so that the controller 104 is prevented from being damaged by an overcurrent signal or a surge signal, and the reliability and the safety of the communication power supply circuit 100 can be improved.

On the basis of any of the above embodiments, the sampling module 108 further includes: capacitor 1085, a first terminal of capacitor 1085 being connected to a second terminal of second resistor 1083, a second terminal of capacitor 1085 being connected to a second terminal of third resistor 1084.

In the embodiment of the present invention, a capacitor 1085 is disposed in the sampling module 108, the capacitor 1085 is connected in parallel between the input positive electrode and the input negative electrode of the power amplification module, and a first end of the capacitor 1085 is connected to a second end of the second resistor 1083, and a second end of the capacitor 1085 is connected to a second end of the third resistor 1084.

Through setting up condenser 1085, can be with the clutter filtering in the sampling signal of first resistance 1081 to improve the purity of sampling signal, consequently can improve the sampling accuracy to the voltage value of first electrical signal, just also can guarantee to judge whether short circuit, the accuracy of the excessive current trouble that misconnection led to appear on the communication bus, avoid damaging the components and parts of weak current load, reduce the burning risk, further improve reliability and the security of air conditioning equipment operation.

Example two

In some embodiments of the present invention, a control method is provided for controlling the communication power supply circuit provided in any of the foregoing embodiments, and fig. 2 shows one of flowcharts of the control method provided according to the embodiment of the present invention, as shown in fig. 2, where the method includes:

Step 202, obtaining a voltage value of a first electric signal;

Step 204, acquiring an operation state of the indoor unit under the condition that the voltage value is larger than a first threshold value;

in step 206, in the case that the running state is the non-power-down state, the fault information of the communication bus is determined to be an overcurrent fault.

On the basis of any one of the above embodiments, the communication power supply circuit includes a power supply module; after determining that the fault information of the communication bus is an overcurrent fault, the method further comprises: and controlling the modulation module to close the communication bus and controlling the power supply module to reduce the voltage value of the output second electric signal.

In the embodiment of the invention, in order to ensure the safety of the communication power supply circuit and prevent the over-current fault from damaging components in the circuit, when the over-current fault is identified to exist on the communication bus, the modulation module can close the communication bus, and after the communication bus is closed, the communication bus does not supply power to the components, modules and the like on the link or send communication signals, so that the over-current fault can be prevented from damaging the components.

On the basis of any one of the above embodiments, while controlling the modulation module to close the communication bus, the control method further includes: starting a first timer; under the condition that the first timing duration reaches the first timing duration, controlling the modulation module to start a communication bus; acquiring the voltage value of the first electric signal again; and under the condition that the voltage value is smaller than a second threshold value, determining that the overcurrent fault is relieved, wherein the second threshold value is smaller than the first threshold value.

In the embodiment of the invention, after judging that the overcurrent fault exists on the communication bus, the system can automatically carry out recovery operation on the overcurrent fault through common sense. Specifically, when the communication bus is closed, the system automatically starts timing, records a first timing time length which is passed after the communication bus is closed, and judges whether the first timing time length reaches the first time length. The first time is mainly used for enabling the components affected by the overcurrent faults to have enough time for heat dissipation.

On the basis of any one of the above embodiments, the control method further includes: and controlling the air conditioning equipment to stop under the condition that the first timing duration reaches the second duration and the voltage value is larger than the second threshold value.

In the embodiment of the invention, after judging that the overcurrent fault exists on the communication bus, the modulation module closes the communication bus, the system automatically starts timing, and the elapsed time after the overcurrent fault is detected, namely the first timing time length, is recorded.

On the basis of any one of the above embodiments, before acquiring the voltage value of the first electrical signal of the communication bus, the method further includes: responsive to an initialization signal of the controller, starting a second timer; under the condition that the second timing time length reaches the third time length, the modulation module is controlled to start the communication bus; and executing the step of acquiring the voltage value of the first electric signal under the condition that the second timing duration reaches the fourth duration.

In the embodiment of the invention, after the air conditioning equipment is started, each control module and each functional module are initialized, the system automatically starts the second timing according to the signal of the initialization completion of the controller. Before the second timing duration does not reach the third duration, the system does not control the modulation module to start the communication bus. The third duration is specifically a duration for ensuring that the protection action of the switching power supply is completed, so that the third duration needs to be longer than the protection duration of the switching power supply in the air conditioning equipment, and therefore overcurrent protection and protection conflict of the switching power supply are prevented.

Example III

In some embodiments of the present application, a control device is provided for controlling the communication power supply circuit provided in any of the above embodiments, fig. 3 shows a block diagram of a control device according to an embodiment of the present application, and as shown in fig. 3, a control device 300 includes:

An acquisition module 302, configured to: acquiring a voltage value of a first electric signal; acquiring the running state of the indoor unit under the condition that the voltage value is larger than a first threshold value;

the determining module 304 is configured to determine that the fault information of the communication bus is an overcurrent fault when the running state is a non-power-down state.

On the basis of any one of the above embodiments, the communication power supply circuit includes a power supply module; the control device further includes: the control module is used for controlling the modulation module to close the communication bus and controlling the power supply module to reduce the voltage value of the output second electric signal.

On the basis of any one of the above embodiments, the control device further includes: the timing module is used for starting the first timing; the control module is also used for controlling the modulation module to start the communication bus under the condition that the first timing duration reaches the first timing duration; the acquisition module is also used for acquiring the voltage value of the first electric signal again; and under the condition that the voltage value is smaller than a second threshold value, determining that the overcurrent fault is relieved, wherein the second threshold value is smaller than the first threshold value.

On the basis of any one of the embodiments, the control module is further configured to control the air conditioning apparatus to stop when the first timing duration reaches the second duration and the voltage value is greater than the second threshold.

On the basis of any one of the above embodiments, the timing module is further configured to start a second timing in response to an initialization signal of the controller; the control module is also used for controlling the modulation module to start the communication bus under the condition that the second timing duration reaches the third duration; the acquisition module is further used for executing the step of acquiring the voltage value of the first electric signal under the condition that the second timing duration reaches the fourth duration.

Example IV

In some embodiments of the present application, fig. 4 shows a second flowchart of a control method provided according to an embodiment of the present application, as shown in fig. 4, the control method includes:

Step 402, after initialization is completed, opening a communication bus after an interval time T1;

Step 404, detecting the bus voltage after the interval time T2;

Step 406, determining whether the bus voltage is greater than a threshold U1; if yes, go to step 408, otherwise return to step 404;

Step 408, judging whether power-down information of the internal machine exists; if yes, go to step 410, otherwise go to step 412;

Step 410, not judging an overcurrent fault, and returning to step 404;

step 412, the communication bus is turned off, an overcurrent fault is reported, and the power supply module is controlled to reduce the voltage of the communication bus;

Step 414, the bus is turned on with T3 as a period, and after the bus is turned on, it is determined whether the bus voltage is less than a threshold U2; if yes, go to step 416, otherwise return to step 412;

Step 416, recovering the fault, recovering the voltage by the power module, and controlling to start the communication bus;

step 418, operating in accordance with normal logic.

In the embodiment of the application, the on-load communication bus control module is used for modulating the direct current power supply into a communication signal to be transmitted on the communication bus, and the pins are used for controlling the communication bus to be opened or closed.

The power module supplies power to the on-load communication bus, for example, the power module is set to 24V, the on-load communication bus modulation module modulates the 24V voltage into a communication signal for transmitting the communication signal, and the communication signal can be used for supplying power at the same time, the voltage of the power module is adjustable, the voltage output of the power module is controlled by the MCU, for example, the voltage of the communication bus is 24V when the voltage of the power module is controlled to output 24V, for example, the voltage of the communication bus is controlled to output 16V, and the voltage of the communication bus is 16V.

The sampling voltage and the high common mode operational amplifier form a current sampling circuit, the current of the communication bus is detected and input to the MCU, the MCU judges whether short circuit or wrong line connection occurs at present according to a preset threshold value, and the high common mode operational amplifier or the high side sampling operational amplifier is required to be adopted.

In order to prevent protection conflict of the switching power supply, the time of T1 is set to be longer than the protection time of the switching power supply, protection of the switching power supply is ensured to operate first, and meanwhile, heat dissipation time of heating caused by impact is provided when the switching power supply is protected. The components and parts are prevented from being damaged by the impact current of the switching power supply.

The time T2 is to prevent the surge current at the bus opening instant from causing erroneous protection.

The threshold U1 is a real-time detection of whether the bus current exceeds the safe current threshold U1 by the system host outdoor unit, and if the current is smaller than U1, no problem is caused even if the current continues for a long time.

Judging whether the internal machine is powered down currently or not, and after the internal machine is powered down, supplying power to the powered down internal machine through a bus, wherein the judgment is added to distinguish the powered down internal machine, so that the current which is normally supplied is prevented from being regarded as short circuit or wrong-line connection current.

The overcurrent fault AA reminds the client of the fault state of the current machine, and is convenient to inquire and remove faults.

The control power module reduces the bus voltage, so as to avoid damaging components when detecting whether the short circuit is recovered, reduce the bus voltage and reduce the impact current.

The time interval T3 detects whether the short circuit is recovered, and the time T3 is used for heat dissipation of the components.

Threshold U2: since the detected current will also decrease after the bus voltage is reduced, the threshold is reduced to U2, avoiding false recognition that a short circuit has been recovered (not actually recovered) after the voltage is reduced.

After detecting for a longer time T4, if the short circuit is not recovered, the bus is turned off and no longer detects, so that heating caused by impacting components in the detection process is avoided.

Example five

In some embodiments of the present invention, there is provided a control apparatus for controlling the communication control circuit provided in any one of the embodiments described above, comprising: a memory for storing programs or instructions; the processor is configured to implement the steps of the control method provided in any of the foregoing embodiments when executing the program or the instructions, so that the control device also includes all the beneficial effects of the control method provided in any of the foregoing embodiments, and is not repeated herein for avoiding repetition.

Example six

In some embodiments of the present invention, a readable storage medium is provided, on which a program or an instruction is stored, which when executed by a processor, implements the steps of the control method provided in any of the above embodiments, and therefore, the readable storage medium also includes all the advantages of the control method provided in any of the above embodiments, and is not described herein in detail for avoiding repetition.

Example seven

In some embodiments of the present invention, there is provided an air conditioning apparatus comprising a communication power supply circuit as provided in any one of the embodiments above; and a control device as provided in any one of the above embodiments; and/or a readable storage medium as provided in any of the above embodiments, so that the air conditioning apparatus also includes the communication power supply circuit as provided in any of the above embodiments, the control device as provided in any of the above embodiments, and/or the readable storage medium as provided in any of the above embodiments, which are not repeated herein.

In the description of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are orientation or positional relationship based on the drawings, merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A communication power supply circuit for an air conditioner, the air conditioner comprising an indoor unit and an outdoor unit, the indoor unit and the outdoor unit being connected by a communication bus, the communication power supply circuit comprising:

The modulation module is connected with the communication bus and used for generating a first electric signal, the first electric signal is used for supplying power and transmitting communication signals, one part of the first electric signal is converted into a direct current power supply signal to supply power to a weak current load of the indoor unit, and the other part of the first electric signal is demodulated and restored into the communication signals;

the controller is connected with the communication bus and is used for determining corresponding fault information according to a comparison result of the voltage value of the first electric signal and a preset threshold value;

The sampling module is connected with the communication bus and the controller;

the controller is specifically used for:

Acquiring the running state of the indoor unit under the condition that the voltage value of the first electric signal is larger than a first threshold value, and determining the fault information of the communication bus as an overcurrent fault under the condition that the running state of the indoor unit is in a non-power-down state;

after the initialization of the controller is completed, starting a second timer; under the condition that the second timing duration reaches the third duration, the modulation module starts the communication bus; and under the condition that the second timing duration reaches a fourth time duration, the sampling module collects the voltage value of the first electric signal on the communication bus.

2. The communication power supply circuit of claim 1, further comprising:

the power module is connected with the communication bus and is used for outputting a second electric signal to the communication bus;

the modulation module is used for modulating the second electric signal to obtain the first electric signal.

3. The communication power supply circuit of claim 1, wherein the sampling module comprises:

the first resistor is arranged on the communication bus, and the first end of the first resistor is connected with the modulation module;

And the input end of the operational amplifier module is connected with the first resistor, and the output end of the operational amplifier module is connected with the controller.

4. A communication power supply circuit according to claim 3, wherein the sampling module further comprises:

The first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the positive electrode of the input end of the operational amplifier module;

and the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the negative electrode of the input end of the operational amplifier module.

5. The communication power supply circuit of claim 4 wherein the sampling module further comprises:

And the first end of the capacitor is connected with the second end of the second resistor, and the second end of the capacitor is connected with the second end of the third resistor.

6. A control method for the communication power supply circuit according to any one of claims 1 to 5, comprising:

Acquiring a voltage value of the first electric signal, wherein one part of the first electric signal is converted into a direct current power supply signal to supply power to a weak current load of the indoor unit, and the other part of the first electric signal is demodulated and restored into a communication signal;

acquiring the running state of the indoor unit under the condition that the voltage value is larger than a first threshold value;

Under the condition that the running state is a non-power-down state, determining that the fault information of the communication bus is an overcurrent fault;

Before the voltage value of the first electric signal is acquired, responding to an initialization signal of the controller, and starting a second timing; controlling the modulation module to start the communication bus under the condition that the second timing duration reaches the third duration; and executing the step of acquiring the voltage value of the first electric signal under the condition that the second timing duration reaches a fourth duration.

7. The control method of claim 6, wherein the communication power supply circuit comprises a power supply module;

after the determining that the fault information of the communication bus is an overcurrent fault, the method further includes:

And controlling the modulation module to close the communication bus, and controlling the power supply module to reduce the voltage value of the output second electric signal.

8. The control method according to claim 7, characterized in that, while the control of the modulation module turns off the communication bus, the control method further comprises:

Starting a first timer;

Controlling the modulation module to start the communication bus under the condition that the first timing duration reaches the first timing duration;

Acquiring the voltage value of the first electric signal again;

And under the condition that the voltage value is smaller than a second threshold value, determining that the overcurrent fault is relieved, wherein the second threshold value is smaller than the first threshold value.

9. The control method according to claim 8, characterized by further comprising:

And controlling the air conditioning equipment to stop under the condition that the first timing duration reaches a second duration and the voltage value is larger than the second threshold value.

10. A control device for a communication power supply circuit according to any one of claims 1 to 5, comprising:

An acquisition module for:

the determining module is used for determining that the fault information of the communication bus is an overcurrent fault under the condition that the running state is a non-power-down state;

the timing module is used for responding to the initialization signal of the controller and starting second timing;

The control module is used for controlling the modulation module to start the communication bus under the condition that the second timing duration reaches the third duration;

The acquisition module is specifically configured to: and executing the step of acquiring the voltage value of the first electric signal under the condition that the second timing duration reaches a fourth duration.

11. A control device for a communication power supply circuit according to any one of claims 1 to 5, comprising:

a memory for storing programs or instructions;

a processor for implementing the control method according to any one of claims 6 to 9 when executing the program or instructions.

12. A readable storage medium having stored thereon a program or instructions, which when executed by a processor, implement the control method according to any one of claims 6 to 9.

13. An air conditioning apparatus, comprising:

A communication power supply circuit as claimed in any one of claims 1 to 5; and

The control device according to claim 10 or 11; and/or

The readable storage medium of claim 12.