CN112557738A

CN112557738A - Voltage detection device, air conditioning system, voltage detection method, and readable storage medium

Info

Publication number: CN112557738A
Application number: CN202011425039.XA
Authority: CN
Inventors: 孙良伟; 梅利军; 吴田; 苏苓会
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-03-26
Anticipated expiration: 2040-12-08
Also published as: CN112557738B

Abstract

The invention provides a voltage detection device, an air conditioning system, a voltage detection method and a readable storage medium. Wherein, voltage detection device for many online systems, voltage detection device links to each other with the host computer in the many online systems, includes: a communication circuit connected to the host; the voltage acquisition circuit is connected to the communication circuit; and the analog load circuit is connected to the communication circuit and is used for simulating the load output action current so as to enable the voltage acquisition circuit to acquire the bus voltage signal in the state of the load output action current at the communication circuit. According to the invention, when the multi-split system is configured, an engineering debugging worker can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device before the slave machine is installed or when the problem of insufficient voltage exists in the multi-split system after installation is detected, so that the installation difficulty is reduced, and the resource waste and the increase of the installation process caused by the subsequent installation of the repeater are avoided.

Description

Voltage detection device, air conditioning system, voltage detection method, and readable storage medium

Technical Field

The invention belongs to the technical field, and particularly relates to a voltage detection device, an air conditioning system, a voltage detection method and a readable storage medium.

Background

In the communication system of the current central air conditioner, the communication bus can supply power as well as communicate. Due to the limitation of the length of the communication line, when the communication line is long, the line resistance is large, and the voltage is insufficient. In the prior art, whether the communication bus has insufficient voltage or not can not be detected in the installation process.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art or the related art.

To this end, a first aspect of the present invention proposes a voltage detection device.

A second aspect of the present invention proposes an air conditioning system.

A third aspect of the invention provides a voltage detection method.

A fourth aspect of the present invention provides a voltage detection method.

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

In view of the above, according to a first aspect of the present invention, there is provided a voltage detection device for a multiple split system, the voltage detection device being connected to a host in the multiple split system, the voltage detection device including: a communication circuit connected to the host; the voltage acquisition circuit is connected to the communication circuit; and the analog load circuit is connected to the communication circuit and is used for simulating the load output action current so as to enable the voltage acquisition circuit to acquire the bus voltage signal in the state of the load output action current at the communication circuit.

The voltage detection device provided by the invention is used for detecting the voltage on the communication bus in the multi-split system, and can determine whether an additional repeater needs to be arranged on the communication bus of the multi-split system according to the detection result. The multi-split air conditioner system comprises a master machine and slave machines connected with the master machine, wherein the number of the slave machines is at least two. The voltage detection device is connected to a communication bus of the multi-split system, namely the voltage detection device is in communication connection with the host.

The voltage detection device comprises a communication circuit, a voltage acquisition circuit and an analog load circuit. The communication circuit is connected with a communication bus in the multi-split system, and the voltage detection device can perform signal interaction with a host through the communication circuit. The analog load circuit can simulate the current output by a load to be driven by a communication bus of the host. When the analog load circuit simulates the load output current, the voltage detection device can detect the voltage signal of the analog load at the communication circuit, and the voltage detection device can detect the voltage signal of the analog load without installing the load at the position to be detected. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device before the slave machine is installed or when the problem that the voltage is insufficient in the multi-split system after installation is detected, the installation difficulty is reduced, and resource waste and installation flow increase caused by subsequent installation of the repeater are avoided.

In some embodiments, when an engineering debugging worker installs the multi-split air conditioning system, the air conditioning master and the communication bus are installed and configured first, then the slaves are installed at required positions one by one, and before the slaves are installed, the voltage detection device provided by the invention is used for detecting the voltage of the positions of the slaves required to be installed on the communication bus. The voltage detection device is arranged at the position of the communication bus where the slave is required to be arranged, and the voltage detection device simulates the action of the electronic expansion valve in the slave, so that whether the voltage at the position of the communication bus where the voltage detection device is arranged is enough to drive the action of the electronic expansion valve of the slave required to be arranged can be detected. If the voltage on the communication bus is detected to be capable of driving the electronic expansion valve in the slave, the slave is installed at the corresponding position, and if the voltage on the communication bus is detected to be insufficient for driving the electronic expansion valve of the slave, a repeater is installed before the slave is installed, so that the voltage at the slave is increased.

In some embodiments, an engineering debugging worker can detect whether the installed multi-split air conditioning system has a problem of insufficient communication bus voltage through the voltage detection device provided by the invention. When the installed slave machine in the multi-split air conditioning system breaks down, engineering debugging personnel can judge whether the air conditioning system needs to be provided with the repeater or not through the voltage detection device.

In the embodiments, the voltage detection device is connected to the farthest end from the main machine, if the communication line is a hand-pulling connection, the voltage detection device is connected to the last slave machine, if the communication line is a star-type connection, the voltage detection device is connected to the longest branch position, and if the communication line is a tree-type connection, the voltage detection device is connected to the farthest branch from the main machine.

In addition, according to the voltage detection device in the above technical solution provided by the present invention, the following additional technical features may be further provided:

in one possible design, the analog load circuit includes: a current source circuit; and a voltage conversion circuit connected to the current source circuit, the voltage conversion circuit being capable of converting the voltage of the current source circuit into a load operation voltage.

In this design, the analog load circuit includes a voltage conversion circuit and a current source circuit. The current source circuit can simulate the action current of the load. One end of the voltage conversion circuit is connected with the current source circuit, and the voltage output by the current source circuit can be converted into the action voltage of the load, so that the current source circuit is prevented from being damaged due to the fact that the voltage input to the current source circuit is too large, and the stability of the current output by the current source circuit analog load can be guaranteed.

In one possible design, the current source circuit includes: a first power supply; the first end of the first switch element is connected with a first power supply, the second end of the first switch element is grounded, and the control end of the first switch element is connected with the first end of the first switch element; and a first end of the second switching element is connected with a third end of the voltage conversion circuit, a second end of the second switching element and a fourth end of the voltage conversion circuit are grounded together, and a control end of the second switching element is connected with a control end of the first switching element.

In this design, the current source circuit includes a first power supply, a first switching element, and a second switching element. The first end and the control end of the first switch element are both connected to a first power supply, and the control end of the second switch element is connected to the control end of the first switch element, so that when the first power supply outputs current, the first end and the control end of the first switch element and the control end of the second switch element are both in a power-on state. The second end of the first switch element and the second end of the second switch element are both grounded, and the first end and the second end of the second switch element are both connected with the voltage conversion module. Therefore, the first switch element and the second switch element form a mirror current source circuit, the mirror current source circuit can output constant current, and the action current of the analog load is realized.

The current value output by the current source circuit can be set by reasonably arranging the output current of the first power supply and the voltage conversion circuit.

In some embodiments, the operating current of the load is set to 800mA (milliamps).

It is understood that the first switching element and the second switching element are both selected to be transistors, the base of the transistor is used as the control terminal of the first switching element and the second switching element, and the collector and the emitter of the transistor are the first terminal and the second terminal of the first switching element and the second switching element. The base end of the triode receives the current signal, and the collector electrode of the triode is conducted to the emitter electrode of the triode, so that the control ends of the first switch element and the second switch element receive the current signal, and the first end of the first switch element and the second end of the second switch element are conducted.

In some embodiments, the first terminal of the voltage converting circuit is connected to the voltage collecting circuit, the second terminal of the voltage converting circuit is grounded, the third terminal of the voltage converting circuit is connected to the first terminal of the second switching element, and the fourth terminal of the voltage converting circuit is connected to the second terminal of the second switching element.

In one possible design, the current source circuit further includes: and a first resistive element, a first terminal of which is connected to the first power supply, and a second terminal of which is connected to the first terminal of the first switching element.

In this design, the current source circuit is further provided with a first resistive element, the first resistive element is selected as a variable resistor, and the current value output by the current source circuit can be directly adjusted by adjusting the resistance value of the variable resistor, and the first resistive element is hereinafter referred to as a first resistor.

The first end of the first resistor is connected to the first power supply, and the second end of the first resistor is connected to the first end of the first switching element. The current output by the first power supply needs to flow through the first resistor before flowing to the position of the first switch element. The voltage of the first power supply is set to be constant, and the current source circuit can be made to output a set current value by adjusting the resistance value of the first resistor.

In one possible design, the voltage acquisition circuit includes: a second power supply; a second resistive element, a first end of which is connected to a second power supply; and a first end of the third resistive element is connected with a second end of the second resistive element, a second end of the third resistive element is grounded, and the first end of the third resistive element is used for outputting a bus voltage signal.

In this design, the voltage acquisition circuit includes a second power supply, a second resistive element, and a third resistive element, both of which are selected as resistors, and hereinafter, the second resistive element is referred to as a second resistor, and the third resistive element is referred to as a third resistor.

The first end of the second resistor is connected to the second power supply, the second end of the second resistor is connected to the first end of the third circuit, and the second end of the third resistor is grounded, namely the second resistor and the third resistor are connected in series with the second power supply. And taking the common end between the second resistor and the third resistor as a voltage sampling end. The second resistor and the third resistor form a voltage division circuit, and voltage signals after voltage division can be detected through the voltage sampling end. From the detected voltage signal it can be determined whether there is sufficient voltage on the communication bus to drive the load to be installed.

In one possible design, the voltage acquisition circuit further includes: and the first end of the capacitor is connected with the second power supply, and the second end of the capacitor is grounded.

In this design, the voltage acquisition circuit further includes a capacitor, a first end of the capacitor is connected to the second power source, and a second end of the capacitor is grounded. The first end of the capacitor is also connected with the first end of the second resistor in the voltage detection circuit and the second end of the diode. The capacitor can filter the voltage signal output by the second power supply, so that the accuracy of the voltage acquisition circuit for detecting the voltage value is improved.

In one possible design, a communication circuit includes: the first end of the diode is connected with the second power supply; and the communication element is connected to the host through a bus, a first end of the communication element is connected with a second end of the diode, and a second end of the communication element is grounded.

In this design, the communication circuit includes a diode and a communication element, the communication element is selected as a communication element to be connected to a load in the communication bus, and the communication element is capable of signal transmission with the host through the communication element voltage detection device. The communication circuit further includes a diode, a first terminal of the diode being connected to the second power supply, and a first terminal of the communication element being connected to a second terminal of the diode. The diode can restrict the flowing direction of the current, and voltage impact on the communication element caused by unstable voltage of the second power supply is avoided, so that the communication element is prevented from being damaged by voltage impact.

In one possible design, the diode conducts from the second terminal to the first terminal.

In this design, the first and second terminals of the diode are connected to the second power supply and the communication element, respectively. The diode is arranged to be conducting from the second terminal to the first terminal and to be non-conducting from the first terminal to the second terminal, i.e. a position where a current on the communication element and the communication bus of the multi-split system can flow through the diode to the second power supply. Conversely, current from the second power source location cannot flow in reverse through the diode to the location of the communication element. Therefore, the damage of the communication element caused by the voltage impact of the second power supply can be effectively avoided.

According to a second aspect of the present invention, there is provided an air conditioning system comprising: a host; at least two slave machines connected with the master machine; the voltage detection device of any of the possible designs of the first aspect described above, connected to a host computer.

The air conditioning system provided by the invention is a multi-split air conditioning system, the air conditioning system comprises a host and at least two slave machines, and the at least two slave machines are connected with the host through a communication bus. The voltage detection device in the first aspect described above is also connected to the host machine in the multi-split air conditioning system via the communication bus.

The voltage detection device comprises a communication circuit, a voltage acquisition circuit and an analog load circuit. The communication circuit is connected with a communication bus in the multi-split system, and the voltage detection device can perform signal interaction with a host through the communication circuit. The analog load circuit can simulate the current output by a load to be driven by a communication bus of the host. When the analog load circuit simulates the load output current, the voltage detection device can detect the voltage signal of the analog load at the communication circuit, so that the voltage signal of the analog load can be detected by the voltage detection device without installing the load at the position needing to be detected. When the multi-split system is configured, an engineering debugging worker can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device before the slave machine is installed, the installation difficulty is reduced, and resource waste and installation flow increase caused by the follow-up installation of the repeater are avoided.

In other embodiments, when an engineering debugging worker installs the multi-split air conditioning system, the air conditioning master and the communication bus are installed and configured first, then the slaves are installed at required positions one by one, and before the slaves are installed, the voltage detection device provided by the invention is used for detecting the voltage of the positions of the slaves required to be installed on the communication bus. The voltage detection device is arranged at the position of the communication bus where the slave is required to be arranged, and the voltage detection device simulates the action of the electronic expansion valve in the slave, so that whether the voltage at the position of the communication bus where the voltage detection device is arranged is enough to drive the action of the electronic expansion valve of the slave required to be arranged can be detected. If the voltage on the communication bus is detected to be capable of driving the electronic expansion valve in the slave, the slave is installed at the corresponding position, and if the voltage on the communication bus is detected to be insufficient for driving the electronic expansion valve of the slave, a repeater is installed before the slave is installed, so that the voltage at the slave is increased.

According to a third aspect of the present invention, there is provided a voltage detection method for a voltage detection device in an air conditioning system as described in the second aspect above, comprising: outputting a detection inquiry command to the host computer through the communication circuit; receiving a detection instruction sent by a host, and controlling a current source circuit to output a set current; acquiring a bus voltage signal through a voltage acquisition circuit; and determining the voltage state according to the bus voltage signal and the set voltage signal.

The voltage detection method provided by the invention is used for detecting the voltage of the air conditioning system in the second aspect so as to determine whether a repeater needs to be additionally arranged in the air conditioning system. Specifically, the voltage detection method according to the fourth aspect of the present invention is applied to a voltage detection device provided in an air conditioning system. The voltage detection device can be connected to a position where the communication bus is provided with the slave, and detects the voltage at the position of the communication bus. The specific detection method comprises the following steps:

the control voltage detection device sends a detection inquiry command to a host machine in the air conditioning system through a communication circuit, namely sends a command whether to carry out voltage detection to the host machine and waits for a detection command returned by the host machine. The voltage detection device responds to a detection instruction returned by the host, starts to perform voltage detection, controls the current source circuit to output set current, acquires a bus voltage signal of the position where the voltage detection device is located on the communication bus through the voltage acquisition circuit, compares the voltage value of the acquired bus voltage signal with the voltage value of the set voltage signal, and determines the voltage state on the communication bus according to the comparison, so that whether a repeater is required to be additionally arranged in the air conditioning system to improve the voltage value on the communication bus is determined. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device before the slave machine is installed or when the problem that the voltage is insufficient in the multi-split system after installation is detected, the installation difficulty is reduced, and resource waste and installation flow increase caused by subsequent installation of the repeater are avoided.

It is understood that the transmission detection inquiry is configured such that when the voltage detection device is connected to the communication bus, the voltage detection device transmits directly to the host, that is, the voltage detection device can detect whether the voltage detection device is connected in the communication bus, and if the connection in the communication bus is detected, the detection inquiry instruction is automatically transmitted. The voltage detection device is also provided with a function key, and a detection inquiry instruction is sent to the host by triggering the corresponding function key.

In addition, according to the voltage detection method in the above technical solution provided by the present invention, the following additional technical features may also be provided:

in one possible design, the step of determining the voltage state according to the bus voltage signal and the setting voltage signal specifically includes: determining that the operation requirement of the slave is met based on the fact that the voltage value of the bus voltage signal is greater than or equal to the voltage value of the set voltage signal; and determining that the operation requirement of the slave is not met based on the fact that the voltage value of the bus voltage signal is smaller than the voltage value of the set voltage signal, and outputting prompt information.

In the design, whether the voltage value on the communication bus in the air conditioning system meets the operation requirement of the slave machine or not can be determined through the magnitude relation of the bus voltage signal detected by the voltage acquisition circuit and the voltage value of the set voltage signal.

The host can control the opening degree of the electronic expansion valve in the slave through the communication bus, so the set voltage is selected as the driving voltage of the electronic expansion valve, when the voltage value of the bus voltage signal is detected to be smaller than the voltage value of the set voltage signal, the voltage at the voltage detection device on the communication bus is judged to be insufficient to drive the electronic expansion valve of the slave, namely the operation requirement of the slave is not met, the voltage detection device is also provided with a video output device and/or an audio output device, the voltage detection device can correspondingly output prompt information through the video output device and/or the audio output device to prompt a user that the voltage on the communication bus is insufficient, and a relay needs to be additionally arranged on the communication bus. When the voltage value of the bus voltage signal is detected to be larger than the voltage value of the set voltage signal, the voltage at the voltage detection device on the communication bus is judged to be enough to drive the electronic expansion valve of the slave, namely the operation requirement of the slave is met. By the aid of the judging method, whether the repeater needs to be additionally arranged on the communication bus can be quickly judged, when a multi-split system is configured, engineering debugging personnel can judge whether the repeater needs to be additionally arranged at the position where the slave needs to be arranged through the voltage detection device before the slave is arranged or when the problem that the voltage is insufficient in the mounted multi-split system is detected, the mounting difficulty is reduced, and resource waste and the increase of mounting processes caused by the follow-up installation of the repeater are avoided.

In one possible design, the detection method further includes: the timing current source circuit outputs the output duration of the set current; and when the output duration reaches the set duration, responding to a completion inquiry command sent by the host computer, and sending a detection completion signal to the host computer.

In this design, the timing is started after the current source circuit outputs the set current, or the timing is started after the voltage detection device receives the detection signal, so as to determine the output time length. And when the timed output duration reaches the set duration, receiving a completion inquiry command returned by the host, and sending a detection completion signal to the host to complete the step of detecting the voltage on the communication bus.

According to a fourth aspect of the present invention, there is provided a voltage detecting method for a main unit in an air conditioning system as described in the second aspect, comprising: and receiving a detection inquiry command and sending a detection command to the voltage detection device.

The voltage detection method provided by the invention is used for detecting the voltage of the air conditioning system in the second aspect so as to determine whether a repeater needs to be additionally arranged in the air conditioning system. Specifically, the voltage detection method according to the fourth aspect of the present invention is applied to a host machine provided in an air conditioning system. The voltage detection device can be connected to a position where the communication bus is provided with the slave, and detects the voltage at the position of the communication bus. The specific detection method comprises the following steps:

after receiving the detection inquiry command sent by the voltage detection device, the host sends a detection command to the voltage detection device so that the voltage detection device starts to detect the voltage value at the voltage detection device.

The voltage detection device responds to a detection instruction sent by the host computer, starts to perform voltage detection, controls the current source circuit to output set current, acquires a bus voltage signal of the position where the voltage detection device is located on the communication bus through the voltage acquisition circuit, compares the voltage value of the acquired bus voltage signal with the voltage value of the set voltage signal, and determines the voltage state on the communication bus according to the comparison, so that whether a repeater is required to be additionally arranged in the air conditioning system to improve the voltage value on the communication bus is determined. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device before the slave machine is installed or when the problem that the voltage is insufficient in the multi-split system after installation is detected, the installation difficulty is reduced, and resource waste and installation flow increase caused by subsequent installation of the repeater are avoided.

in one possible design, the voltage detection method further includes: and sending a query completion instruction to the voltage detection device according to a set period.

In the design, the host sends a completion inquiry command to the voltage detection device according to a set period, so that the voltage detection device can timely return a detection completion signal to the host after detection is completed, and the detection of the voltage on the communication bus is quickly completed.

According to a fifth aspect of the present invention, a readable storage medium is provided, on which a program or instructions are stored, which when executed by a processor implement the steps of the voltage detection method as in any one of the possible designs described above. Therefore, all the beneficial technical effects of the voltage detection method in any one of the possible designs are achieved, and no redundant description is given here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a circuit diagram of a voltage detection device in a first embodiment of the present invention;

fig. 2 shows a circuit diagram of a voltage detection device in a second embodiment of the present invention;

fig. 3 shows a schematic configuration of an air conditioning system in a third embodiment of the present invention;

FIG. 4 shows one of the flow diagrams of a voltage detection method in a fourth embodiment of the invention;

FIG. 5 is a second flowchart of a voltage detection method according to a fourth embodiment of the present invention;

fig. 6 shows a schematic flow chart of a voltage detection method in a fifth embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

100 voltage detection device, 120 communication circuit, 122 diode, 124 communication element, 140 voltage acquisition circuit, 142 second power supply, 144 second resistive element, 146 third resistive element, 148 capacitor, 160 analog load circuit, 162 current source circuit, 1622 first power supply, 1624 first switch element, 1626 second switch element, 1628 first resistive element, 164 voltage conversion circuit, 200 air conditioning system, 202 master, 204 slave.

Detailed Description

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

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

A voltage detection apparatus, an air conditioning system, a voltage detection method, and a readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 6.

The first embodiment is as follows:

as shown in fig. 1, a first embodiment of the present invention provides a voltage detection apparatus 100 for a multiple split system, where the voltage detection apparatus 100 is connected to a host in the multiple split system, and includes: communication circuit 120, voltage acquisition circuit 140, and analog load circuit 160. The communication circuit 120 is connected to the host; the voltage acquisition circuit 140 is connected to the communication circuit 120; the analog load circuit 160 is connected to the communication circuit 120, and the analog load circuit 160 is used for simulating the load output action current, so that the voltage collecting circuit 140 can collect the bus voltage signal in the state of the load output action current at the communication circuit 120.

In this embodiment, the voltage detection device 100 is used to detect the voltage on the communication bus in the multi-split system, and it is possible to determine whether an additional repeater needs to be provided on the communication bus of the multi-split system based on the detection result. The multi-split air conditioner system comprises a master machine and slave machines connected with the master machine, wherein the number of the slave machines is at least two. The voltage detection device 100 is connected to a communication bus of the multi-split system, that is, the voltage detection device 100 is connected to a host computer in a communication manner.

The voltage detection device 100 includes a communication circuit 120, a voltage acquisition circuit 140, and an analog load circuit 160. The communication circuit 120 is connected to a communication bus in the multi-split system, and the voltage detection device 100 can perform signal interaction with a host computer through the communication circuit 120. The analog load circuit 160 is capable of simulating the current output by a load to be driven by the communication bus of the host. When the analog load circuit 160 simulates a load output current, the voltage detection device 100 can detect a voltage signal of an analog load at the communication circuit 120, and the voltage detection device 100 detects the voltage signal of the analog load without installing the load at a position to be detected. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device 100 before the slave machine is installed or when the problem of insufficient voltage exists in the multi-split system after installation is detected, so that the installation difficulty is reduced, and the resource waste and the increase of the installation process caused by the follow-up installation of the repeater are avoided.

In some embodiments, when an engineering debugger installs the multi-split air conditioning system 200, the engineering debugger first installs and configures the air conditioning master and the communication bus, then installs the slaves one by one at a required position, and before installing the slaves, performs voltage detection on the position of the slaves required to be installed on the communication bus by using the voltage detection device 100 provided by the present invention. The voltage detection device 100 is installed at a position where a slave needs to be installed on a communication bus, and the voltage detection device 100 simulates the operation of an electronic expansion valve in the slave, so that whether the voltage at the position of the communication bus where the voltage detection device 100 is located is sufficient to drive the operation of the electronic expansion valve of the slave that needs to be installed can be detected. If the voltage on the communication bus is detected to be capable of driving the electronic expansion valve in the slave, the slave is installed at the corresponding position, and if the voltage on the communication bus is detected to be insufficient for driving the electronic expansion valve of the slave, a repeater is installed before the slave is installed, so that the voltage at the slave is increased.

In some embodiments, an engineering debugger can detect whether the installed multi-split air conditioning system 200 has a problem of insufficient communication bus voltage through the voltage detection device 100 provided by the present invention. When a slave in the installed multi-split air conditioning system 200 malfunctions, an engineer can determine whether the air conditioning system 200 needs to be provided with a repeater through the voltage detection device 100.

In these embodiments, the voltage detection device 100 is connected to the farthest end from the master, and if the communication line is a hand-held connection, the voltage detection device 100 is connected to the last slave, and if the communication line is a star-type connection, the voltage detection device 100 is connected to the longest branch, and if the communication line is a tree-type connection, the voltage detection device 100 is connected to the farthest branch from the master.

Example two:

as shown in fig. 2, a second embodiment of the present invention provides a voltage detection apparatus 100 for a multiple split system, where the voltage detection apparatus 100 is connected to a host in the multiple split system, and includes: communication circuit 120, voltage acquisition circuit 140, and analog load circuit 160. The communication circuit 120 is connected to the host; the voltage acquisition circuit 140 is connected to the communication circuit 120; the analog load circuit 160 is connected to the communication circuit 120, and the analog load circuit 160 is used for simulating a load output operation current, so that the voltage acquisition circuit 140 can acquire a bus voltage signal in a state of the load output operation current at the communication circuit 120.

As shown in fig. 2, the analog load circuit 160 includes: a current source circuit 162 and a voltage conversion circuit 164. The voltage conversion circuit 164 is connected to the current source circuit 162, and the voltage conversion circuit 164 can convert the voltage of the current source circuit 162 into a load operation voltage.

In this embodiment, the voltage detection device 100 includes a communication circuit 120, a voltage acquisition circuit 140, and an analog load circuit 160. The communication circuit 120 is connected to a communication bus in the multi-split system, and the voltage detection device 100 can perform signal interaction with a host computer through the communication circuit 120. The analog load circuit 160 is capable of simulating the current output by a load to be driven by the communication bus of the host. When the analog load circuit 160 simulates a load output current, the voltage detection device 100 can detect a voltage signal of an analog load at the communication circuit 120, and the voltage detection device 100 detects the voltage signal of the analog load without installing the load at a position to be detected. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave machine to be installed needs to be additionally provided with the repeater or not through the voltage detection device 100 before the slave machine is installed or when the problem of insufficient voltage exists in the multi-split system after installation is detected, so that the installation difficulty is reduced, and the resource waste and the increase of the installation process caused by the follow-up installation of the repeater are avoided.

The analog load circuit 160 includes a voltage conversion circuit 164 and a current source circuit 162. The current source circuit 162 can simulate the operating current of the load. One end of the voltage conversion circuit 164 is connected to the current source circuit 162, and can convert the voltage output from the current source circuit into the operating voltage of the load, thereby preventing the current source circuit 162 from being damaged due to an excessively large voltage input to the current source circuit 162, and ensuring the stability of the current output by the current source circuit 162 in simulation of the load.

It is understood that the voltage detection device 100 is used to detect the voltage on the communication bus in the multi-split system, and it can be determined whether an additional repeater needs to be provided on the communication bus of the multi-split system according to the detection result. The multi-split air conditioner system comprises a master machine and slave machines connected with the master machine, wherein the number of the slave machines is at least two. The voltage detection device 100 is connected to a communication bus of the multi-split system, that is, the voltage detection device 100 is connected to a host computer in a communication manner.

In any of the above embodiments, the current source circuit 162 includes: a first power supply 1622, a first switching element 1624, and a second switching element 1626. A first terminal of the first switching element 1624 is connected to a first power supply 1622, a second terminal of the first switching element 1624 is grounded, and a control terminal of the first switching element 1624 is connected to the first terminal of the first switching element 1624; a first terminal of the second switching element 1626 is connected to the third terminal of the voltage converting circuit 164, a second terminal of the second switching element 1626 is commonly grounded to the fourth terminal of the voltage converting circuit 164, and a control terminal of the second switching element 1626 is connected to a control terminal of the first switching element 1624.

In this embodiment, the current source circuit 162 includes a first power supply 1622, a first switching element 1624, and a second switching element 1626. The first end and the control end of the first switch element 1624 are both connected to the first power supply 1622, and the control end of the second switch element 1626 is connected to the control end of the first switch element 1624, so that when the first power supply 1622 outputs current, the first end and the control end of the first switch element 1624 and the control end of the second switch element 1626 are both in a power-on state. The second terminal of the first switching element 1624 and the second terminal of the second switching element 1626 are both grounded, and the first terminal and the second terminal of the second switching element 1626 are both connected to the voltage conversion module. Thus, the first switching element 1624 and the second switching element 1626 constitute the mirror current source circuit 162, and the mirror current source circuit 162 can output a constant current, thereby realizing an operation current of the analog load.

However, the current value output by the current source circuit 162 can be set by appropriately arranging the output current of the first power supply 1622 and the voltage conversion circuit 164.

It is understood that the first switching element 1624 and the second switching element 1626 are each selected as a triode, a base of the triode serves as a control terminal of the first switching element 1624 and the second switching element 1626, and a collector and an emitter of the triode serve as a first terminal and a second terminal of the first switching element 1624 and the second switching element 1626. The base terminal of the triode receives the current signal to conduct the collector to the emitter of the triode, so that the control terminals of the first switching element 1624 and the second switching element receive the current signal, and the first end to the second end of the first switching element 1624 and the second switching element 1626 are conducted.

In some embodiments, a first terminal of the voltage converting circuit 164 is connected to the voltage collecting circuit 140, a second terminal of the voltage converting circuit 164 is connected to ground, a third terminal of the voltage converting circuit 164 is connected to a first terminal of the second switching element 1626, and a fourth terminal of the voltage converting circuit 164 is connected to a second terminal of the second switching element 1626.

In any of the above embodiments, the current source circuit 162 further includes: a first resistive element 1628, a first terminal of the first resistive element 1628 connected to a first power supply 1622, and a second terminal of the first resistive element 1628 connected to a first terminal of a first switching element 1624.

In this embodiment, a first resistive element 1628 is further disposed in the current source circuit 162, the first resistive element 1628 is selected as a variable resistor, and a current value output by the current source circuit 162 can be directly adjusted by adjusting a resistance value of the variable resistor, and the first resistive element 1628 is hereinafter referred to as a first resistor.

A first terminal of the first resistor is connected to a first power supply 1622, and a second terminal of the first resistor is connected to a first terminal of a first switching element 1624. The current from the first power source 1622 needs to flow through the first resistor before flowing to the first switch element 1624. The voltage of the first power supply 1622 is set to be constant, and the current source circuit 162 can output a set current value by adjusting the resistance value of the first resistor.

In any of the above embodiments, the voltage acquisition circuit 140 includes: a second power supply 142, a second resistive element 144, and a third resistive element 146. A first terminal of the second resistive element 144 is connected to the second power supply 142; a first terminal of the third resistive element 146 is connected to a second terminal of the second resistive element 144, the second terminal of the third resistive element 146 is connected to ground, and the first terminal of the third resistive element 146 is used for outputting a bus voltage signal.

In this embodiment, the voltage acquisition circuit 140 includes a second power supply 142, a second resistive element 144, and a third resistive element 146, the second resistive element 144 and the third resistive element 146 each being selected as a resistor, and the second resistive element 144 will be referred to as a second resistor and the third resistive element 146 will be referred to as a third resistor.

A first terminal of the second resistor is connected to the second power supply 142, a second terminal of the second resistor is connected to a first terminal of the third circuit, and a second terminal of the third resistor is grounded, i.e., the second resistor and the third resistor are connected in series with the second power supply 142. And taking the common end between the second resistor and the third resistor as a voltage sampling end. The second resistor and the third resistor form a voltage division circuit, and voltage signals after voltage division can be detected through the voltage sampling end. From the detected voltage signal it can be determined whether there is sufficient voltage on the communication bus to drive the load to be installed.

In any of the above embodiments, the voltage acquisition circuit 140 further comprises a capacitor 148, a first terminal of the capacitor 148 is connected to the second power supply 142, and a second terminal of the capacitor 148 is connected to ground.

In this embodiment, the voltage acquisition circuit 140 further includes a capacitor 148, a first terminal of the capacitor 148 is connected to the second power supply 142, and a second terminal of the capacitor 148 is grounded. The first terminal of the capacitor 148 is also connected to the first terminal of the second resistor in the voltage detection circuit and to the second terminal of the diode 122. The capacitor 148 can filter the voltage signal output by the second power supply 142, thereby improving the accuracy of the voltage value detection of the voltage acquisition circuit 140.

In any of the above embodiments, the communication circuit 120 includes: a diode 122 and a communication element 124. A first terminal of the diode 122 is connected to the second power supply 142; the communication element 124 is connected to the host through a bus, a first terminal of the communication element 124 is connected to a second terminal of the diode 122, and a second terminal of the communication element 124 is grounded.

In this embodiment, the communication circuit 120 includes a diode 122 and a communication element 124, the communication element 124 is selected as the communication element 124 to be connected to the load in the communication bus, and the voltage detection device 100 can perform signal transmission with the host through the communication element 124. The communication circuit 120 further includes a diode 122, a first terminal of the diode 122 is connected to the second power source 142, and a first terminal of the communication element 124 is connected to a second terminal of the diode 122. The diode 122 can limit the flowing direction of the current, and prevent the second power supply 142 from causing voltage impact on the communication element 124 in the case of unstable voltage, so as to prevent the communication element 124 from being damaged due to the voltage impact.

In any of the above embodiments, the diode 122 conducts from the second terminal to the first terminal.

In this embodiment, the first and second terminals of the diode 122 are connected to the second power supply 142 and the communication element 124, respectively. The diode 122 is arranged to be turned on from the second terminal to the first terminal and to be turned off from the first terminal to the second terminal, i.e. a position where the current on the communication bus of the multi-split system and the communication element 124 can flow through the diode 122 to the second power supply 142. Conversely, current from the second power source 142 position cannot flow in reverse through the diode 122 to the communication element 124 position. Therefore, the damage of the communication element 124 caused by the voltage surge of the second power supply 142 can be effectively avoided.

Example three:

as shown in fig. 3, a third embodiment of the present invention provides an air conditioning system 200, including: a master 202, at least two slaves 204, and a voltage detection device 100, wherein the voltage detection device 100 is the voltage detection device 100 of the first or second embodiment. The slave 204 is connected to the master 202, and the voltage detection apparatus 100 is connected to the master 202.

In this embodiment, the air conditioning system 200 is a multi-split air conditioning system 200, the air conditioning system 200 includes a master 202 and at least two slaves 204, and the at least two slaves 204 are connected to the master 202 through a communication bus. The voltage detection device 100 is also connected to the main unit 202 of the multi-split air conditioning system 200 through a communication bus.

The voltage detection device 100 includes a communication circuit 120, a voltage acquisition circuit 140, and an analog load circuit 160. The communication circuit 120 is connected to a communication bus in the multi-split system, and the voltage detection device 100 can perform signal interaction with the host 202 through the communication circuit 120. The analog load circuit 160 is capable of simulating the current output by a load to be driven by the communication bus of the host 202. When the analog load circuit 160 simulates the load output current, the voltage detection apparatus 100 can detect the voltage signal of the analog load at the communication circuit 120, and the voltage signal can be detected by the voltage detection apparatus 100 without installing the load at a position to be detected. When the multi-split system is configured, engineering debugging personnel can judge whether the repeater needs to be added at the position where the slave 204 needs to be installed through the voltage detection device 100 before the slave 204 is installed, so that the installation difficulty is reduced, and the resource waste and the increase of the installation process caused by the follow-up installation of the repeater are avoided.

In some embodiments, an engineering debugger can detect whether the installed multi-split air conditioning system 200 has a problem of insufficient communication bus voltage through the voltage detection device 100 provided by the present invention. When the slave 204 in the installed multi-split air conditioning system 200 malfunctions, the engineer can determine whether the air conditioning system 200 needs to be provided with a relay through the voltage detection device 100.

In these embodiments, the voltage detection device 100 is connected to the farthest end from the master 202, and if the communication line is a hand-held connection, the voltage detection device 100 is connected to the last slave 204, if the communication line is a star-type connection, the voltage detection device 100 is connected to the longest branch, and if the communication line is a tree-type connection, the voltage detection device 100 is connected to the farthest branch from the master 202.

In other embodiments, when the multi-split air conditioning system 200 is installed, an engineer firstly installs and configures the air conditioning master 202 and the communication bus, then installs the slaves 204 one by one at a required position, and before installing the slaves 204, performs voltage detection on the position of the slave 204 required to be installed on the communication bus by using the voltage detection device 100 provided by the present invention. The voltage detection device 100 is installed at a position of the communication bus where the slave 204 is required to be installed, and the voltage detection device 100 simulates the operation of the electronic expansion valve in the slave 204, so that whether the voltage at the position of the communication bus where the voltage detection device 100 is located is sufficient to drive the operation of the electronic expansion valve of the slave 204 required to be installed can be detected. If the voltage on the communication bus is detected to be capable of driving the electronic expansion valve in the slave 204, the slave 204 is installed at the corresponding position, and if the voltage on the communication bus is detected to be insufficient for driving the electronic expansion valve of the slave 204, a repeater is installed before the slave 204 is installed, so that the voltage at the slave 204 is increased.

Example four:

as shown in fig. 4, a fourth embodiment of the present invention provides a voltage detection method for a voltage detection device 100 in an air conditioning system 200 as in the third embodiment, including:

step 402, outputting a detection inquiry command to a host computer through a communication circuit;

step 404, in response to a detection instruction sent by the host, controlling the current source circuit to output a set current;

step 406, collecting a bus voltage signal through a voltage collecting circuit;

and step 408, comparing the bus voltage signal with the set voltage signal, and determining the voltage state according to the comparison result.

In this embodiment, the voltage detection method is used to perform voltage detection on the air conditioning system 200 in the third embodiment, thereby determining whether it is necessary to add a repeater in the air conditioning system 200. Specifically, the present embodiment proposes a voltage detection method for the voltage detection device 100 provided in the air conditioning system 200. The voltage detection device 100 can be connected to a position where the slave 204 is disposed on the communication bus, and can detect a voltage at the position on the communication bus. The specific detection method comprises the following steps:

the control voltage detection device 100 sends a detection inquiry command to the host 202 in the air conditioning system 200 through the communication circuit 120, that is, sends a command to the host 202 whether to perform voltage detection, and waits for a detection command sent back by the host 202. The voltage detection device 100 starts to perform voltage detection in response to a detection instruction returned by the host 202, controls the current source circuit 162 to output a set current, collects a bus voltage signal of a position where the voltage detection device 100 is located on the communication bus through the voltage collection circuit 140, compares a voltage value of the collected bus voltage signal with a voltage value of the set voltage signal, and determines a voltage state on the communication bus according to the comparison, thereby determining whether a repeater needs to be added in the air conditioning system 200 to improve the voltage value on the communication bus. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave 204 to be installed needs to be additionally provided with the repeater or not through the voltage detection device 100 before the slave 204 is installed or when the problem of insufficient voltage exists in the multi-split system after installation is detected, so that the installation difficulty is reduced, and the resource waste and the increase of the installation process caused by the follow-up installation of the repeater are avoided.

It is understood that the transmission detection inquiry is configured such that when the voltage detection device 100 is connected to the communication bus, the voltage detection device 100 directly transmits to the host 202, that is, the voltage detection device 100 can detect whether the voltage detection device 100 is connected in the communication bus, and if the connection in the communication bus is detected, the detection inquiry instruction is automatically transmitted. The voltage detection device 100 is further provided with a function key, and sends a detection inquiry command to the host 202 by triggering the corresponding function key.

In any of the above embodiments, the step of determining the voltage state according to the bus voltage signal and the setting voltage signal specifically includes: when the voltage value of the bus voltage signal is detected to be greater than or equal to the voltage value of the set voltage signal, the bus voltage value is judged to meet the operation requirement of the slave 204, and when the voltage value of the bus voltage signal is detected to be smaller than the voltage value of the set voltage signal, the bus voltage value is judged not to meet the operation requirement of the slave 204, and prompt information is output.

In this embodiment, whether the voltage value on the communication bus in the air conditioning system 200 meets the operation requirement of the slave 204 can be determined through the magnitude relationship between the bus voltage signal detected by the voltage acquisition circuit 140 and the voltage value of the setting voltage signal.

The master 202 can control the opening degree of the electronic expansion valve in the slave 204 through the communication bus, so the set voltage is selected as the driving voltage of the electronic expansion valve, when the voltage value of the bus voltage signal is detected to be smaller than the voltage value of the set voltage signal, it is determined that the voltage at the voltage detection device 100 on the communication bus is insufficient to drive the electronic expansion valve of the slave 204, that is, the operation requirement of the slave 204 is not met, the voltage detection device 100 is further provided with a video output device and/or an audio output device, the voltage detection device 100 can correspondingly output prompt information through the video output device and/or the audio output device to prompt a user that the voltage on the communication bus is insufficient, and a relay needs to be additionally arranged on the communication bus. When the voltage value of the bus voltage signal is detected to be greater than the voltage value of the set voltage signal, it is determined that the voltage at the voltage detection device 100 on the communication bus is sufficient to drive the electronic expansion valve of the slave 204, i.e., the operation requirement of the slave 204 is satisfied. By the aid of the judging method, whether the repeater needs to be additionally arranged on the communication bus can be quickly judged, when a multi-split system is configured, engineering debugging personnel can judge whether the repeater needs to be additionally arranged at the position where the slave 204 needs to be arranged through the voltage detecting device 100 before the slave 204 is arranged or when the problem that the voltage is insufficient in the mounted multi-split system is detected, the mounting difficulty is reduced, and resource waste and increase of mounting processes caused by subsequent installation of the repeater are avoided.

As shown in fig. 5, in any of the above embodiments, the detection method further includes:

step 502, timing the output duration of the set current output by the current source circuit;

and step 504, when the output duration reaches the set duration, receiving a completion inquiry command sent by the host computer, and sending a detection completion signal to the host computer.

In this embodiment, the timing is started after the current source circuit 162 outputs the set current, or the timing is started after the voltage detection device 100 receives the detection signal to determine the output time period. When the timed output duration reaches the set duration and receives the query completion instruction returned by the host 202, a detection completion signal is sent to the host 202, and the step of detecting the voltage on the communication bus is completed.

Example five:

as shown in fig. 6, a fifth embodiment of the present invention provides a voltage detection method for a main unit 202 in an air conditioning system 200 according to the third embodiment, including:

step 602, receiving a detection inquiry instruction;

in step 604, a detection command is output to the voltage detection device.

In this embodiment, the voltage detection method is used to perform voltage detection on the air conditioning system 200 in the third embodiment, thereby determining whether it is necessary to add a repeater in the air conditioning system 200. Specifically, the present embodiment proposes a voltage detection method for the main unit 202 provided in the air conditioning system 200. The voltage detection device 100 can be connected to a position where the slave 204 is disposed on the communication bus, and can detect a voltage at the position on the communication bus. The specific detection method comprises the following steps:

after receiving the detection inquiry command sent by the voltage detection device 100, the host 202 sends a detection command to the voltage detection device 100, so that the voltage detection device 100 starts to detect the voltage value at the voltage detection device 100.

The voltage detection device 100 starts to perform voltage detection in response to a detection instruction sent by the host 202, controls the current source circuit to output a set current, collects a bus voltage signal of a position where the voltage detection device 100 is located on the communication bus through the voltage collection circuit, compares the voltage value of the collected bus voltage signal with the voltage value of the set voltage signal, and determines the voltage state on the communication bus according to the comparison solution, thereby determining whether a repeater needs to be additionally arranged in the air conditioning system 200 to improve the voltage value on the communication bus. When the multi-split system is configured, engineering debugging personnel can judge whether the position of the slave 204 to be installed needs to be additionally provided with the repeater or not through the voltage detection device 100 before the slave 204 is installed or when the problem of insufficient voltage exists in the multi-split system after installation is detected, so that the installation difficulty is reduced, and the resource waste and the increase of the installation process caused by the follow-up installation of the repeater are avoided.

In any of the above embodiments, the voltage detection method further includes: the completion inquiry command is transmitted to the voltage detection device 100 in a set cycle.

In this embodiment, the host 202 sends a complete query command to the voltage detection device 100 according to a set period, so that the voltage detection device 100 can transmit a detection complete signal back to the host 202 in time after the detection is completed, thereby quickly completing the detection of the voltage on the communication bus.

Example six:

a complete embodiment of the present invention provides a voltage detection method for the main unit 202 of the air conditioning system 200 according to the third embodiment.

After the air conditioning system 200 is installed, the voltage detection device 100 is connected to the slave 204 on the communication bus farthest from the master 202.

If the communication line between the slaves 204 is a hand-held connection, the slave is connected to the last master 202, if the slave is a star connection, the slave is connected to the longest branch, and if the slave is a tree connection, the slave is connected to the branch farthest from the master 202. The communication circuit 120 in the voltage detection device 100 is the same as the communication circuit 120 of the slave 204, the voltage detection device 100 corresponds to one slave 204, the address can be set to a specific address, such as 255 or other addresses, and when the address is fixed, the other slaves 204 can not use the address, so that address duplication is avoided.

The voltage detection device 100 comprises a communication bus access port, in which the communication element 124 is arranged at the very end. The communication element 124 is a communication circuit 120 of the slave 204, the voltage detection device 100 corresponds to the slave 204 and the master 202, the diode 122 can be turned off in the reverse direction, the capacitor 148 filters a power supply, the second resistor and the third resistor form a voltage division circuit for detecting a bus voltage signal, the voltage conversion circuit can convert the voltage into an operating voltage of an electronic expansion valve in the slave 204, and the first switch element 1624, the second switch element 1626 and the first resistor form a mirror current source circuit 162 which can simulate an operating current of the electronic expansion valve in the slave 204.

The master 202 receives the detection inquiry command sent by the voltage detection device 100, the master 202 replies the detection command to the voltage detection device 100, and then the master 202 exchanges communication data with other slaves 204 normally. At intervals, a complete inquiry command is periodically sent to the voltage detection device 100.

The voltage detection device 100 receives a detection instruction transmitted by the host 202, drives the current source circuit 162 to output a constant current, the current can be adjusted to 800mA (milliampere) through the first resistor, the action time of the current source circuit 162 can be set to 1 minute, and meanwhile, the voltage detection device 100 displays a word of "detecting" to an engineering debugging worker through a man-machine interaction interface. Meanwhile, the main control chip of the voltage detection device 100 detects the voltage signal divided by the second resistor and the third resistor in real time, calculates the voltage value of the bus voltage signal, and compares the voltage value of the bus voltage signal with the voltage value of the set voltage signal continuously; the set voltage value is selected to be 13V (volt), if the voltage value of the detected bus voltage signal is continuously smaller than the voltage value of the set voltage signal, it is determined that the communication bus needs to be additionally provided with the repeater. If the voltage value of the detected bus voltage signal is continuously larger than or equal to the voltage value of the set voltage signal, the repeater is judged not to be required to be added. After the detection time is reached, the voltage detection apparatus 100 waits for the query completion instruction sent by the host 202, and when receiving the detection instruction of the host 202, replies a detection completion signal to the host 202, and displays the detection result through the human-computer interaction interface. The detection process of whether a repeater needs to be installed is completed.

Whether the communication bus needs to be added with the repeater to improve the voltage or not is detected by the voltage detection device 100, engineering debugging personnel can make an accurate judgment when the air conditioning unit is debugged, the installation difficulty of the repeater is prevented from being increased in the later period, and the problem that the repeater is installed in the air conditioning system 200 without the repeater is avoided, so that the resource waste is caused and the installation flow is prevented from being increased.

Example seven:

a seventh embodiment of the present invention provides a readable storage medium, on which a program is stored, the program, when executed by a processor, implementing the voltage detection method as in any one of the above embodiments, thereby having all the advantageous technical effects of the voltage detection method as in any one of the above embodiments.

The readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.

It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

In the claims, the specification and the drawings of the specification of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings only for the purpose of describing the present invention more conveniently and simplifying the description, and do not indicate or imply that the referred device or element must have the described specific orientation, be constructed and operated in the specific orientation, and thus the description should not be construed as limiting the present invention; the terms "connect," "mount," "secure," and the like are to be construed broadly, and for example, "connect" may refer to a fixed connection between multiple objects, a removable connection between multiple objects, or an integral connection; the multiple objects may be directly connected to each other or indirectly connected to each other through an intermediate. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the above data specifically.

In the claims, specification, and drawings that follow the present disclosure, the description of the terms "one embodiment," "some embodiments," "specific embodiments," and so forth, means 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 disclosure. In the claims, specification and drawings of the present invention, 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 is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A voltage detection device for a multi-split system, wherein the voltage detection device (100) is connected to a host in the multi-split system, the voltage detection device comprising:

a communication circuit (120) connected to the host;

a voltage acquisition circuit (140) connected to the communication circuit (120);

the analog load circuit (160) is connected to the communication circuit (120), and the analog load circuit (160) is used for simulating a load output action current so as to enable the voltage acquisition circuit (140) to acquire a bus voltage signal in a load output action current state at the communication circuit (120).

2. The voltage detection apparatus of claim 1, wherein the analog load circuit (160) comprises:

a current source circuit (162);

and a voltage conversion circuit (164) connected to the current source circuit (162), wherein the voltage conversion circuit (164) is capable of converting the voltage of the current source circuit (162) into a load operation voltage.

3. The voltage detection apparatus according to claim 2, wherein the current source circuit (162) includes:

a first power supply (1622);

a first switching element (1624), a first terminal of the first switching element (1624) being coupled to the first power source (1622), a second terminal of the first switching element (1624) being coupled to ground, a control terminal of the first switching element (1624) being coupled to the first terminal of the first switching element (1624);

a second switching element (1626), a first end of the second switching element (1626) being connected to the third end of the voltage conversion circuit (164), a second end of the second switching element (1626) being commonly grounded to the fourth end of the voltage conversion circuit (164), and a control end of the second switching element (1626) being connected to the control end of the first switching element (1624).

4. The voltage detection apparatus of claim 3, wherein the current source circuit (162) further comprises:

a first resistive element (1628), a first end of the first resistive element (1628) coupled to the first power supply (1622), a second end of the first resistive element (1628) coupled to a first end of the first switching element (1624).

5. The voltage detection device according to any one of claims 1 to 4, wherein the voltage acquisition circuit (140) comprises:

a second power supply (142);

a second resistive element (144), a first end of the second resistive element (144) being connected to the second power supply (142);

a third resistive element (146), wherein a first end of the third resistive element (146) is connected to a second end of the second resistive element (144), a second end of the third resistive element (146) is grounded, and the first end of the third resistive element (146) is used for outputting a bus voltage signal.

6. The voltage detection device of claim 5, wherein the voltage acquisition circuit (140) further comprises:

a capacitor (148), a first terminal of the capacitor (148) being connected to the second power supply (142), a second terminal of the capacitor (148) being connected to ground.

7. The voltage detection apparatus of claim 5, wherein the communication circuit (120) comprises:

a diode (122), a first terminal of the diode (122) being connected to the second power source (142);

a communication element (124) connected to the host through a bus, a first end of the communication element (124) being connected to a second end of the diode (122), the second end of the communication element (124) being connected to ground.

8. The voltage detection apparatus according to claim 7,

the diode (122) conducts from the second terminal to the first terminal.

9. An air conditioning system, comprising:

a host (202);

at least two slaves (204) connected to the master (202);

the voltage detection device (100) of any one of claims 1 to 8, connected to the host (202).

10. A voltage detection method for the voltage detection device (100) in the air conditioning system (200) according to claim 9, comprising:

outputting a detection query instruction to the host (202) through the communication circuit (120);

receiving a detection instruction sent by the host (202), and controlling the current source circuit (162) to output a set current;

acquiring a bus voltage signal by the voltage acquisition circuit (140);

and determining the voltage state according to the bus voltage signal and the set voltage signal.

11. The voltage detection method according to claim 10, wherein the step of determining the voltage state according to the bus voltage signal and the setting voltage signal specifically comprises:

determining that the operation requirement of the slave (204) is met based on the voltage value of the bus voltage signal being greater than or equal to the voltage value of the set voltage signal;

and determining that the operation requirement of the slave (204) is not met based on the fact that the voltage value of the bus voltage signal is smaller than the voltage value of the set voltage signal, and outputting prompt information.

12. The voltage detection method according to claim 10, further comprising:

timing an output time length for the current source circuit (162) to output the set current;

and when the output duration reaches a set duration, sending a detection completion signal to the host (202) in response to a completion inquiry command sent by the host (202).

13. A voltage detection method for the main unit (202) in the air conditioning system (200) according to claim 9, comprising:

and a detection inquiry command is received, and a detection command is sent to the voltage detection device (100).

14. The voltage detection method according to claim 13, further comprising:

and sending a query completion instruction to the voltage detection device (100) according to a set period.

15. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the voltage detection method according to any one of claims 10 to 14.