CN111555240A - Air conditioner wire controller protection method and protection system - Google Patents
Air conditioner wire controller protection method and protection system Download PDFInfo
- Publication number
- CN111555240A CN111555240A CN202010454912.1A CN202010454912A CN111555240A CN 111555240 A CN111555240 A CN 111555240A CN 202010454912 A CN202010454912 A CN 202010454912A CN 111555240 A CN111555240 A CN 111555240A
- Authority
- CN
- China
- Prior art keywords
- controller
- line controller
- return signal
- protection
- air conditioner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Landscapes
- Air Conditioning Control Device (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides a method and a system for protecting a wired controller of an air conditioner. The method comprises the following steps: step one, supplying power to a line controller, and monitoring a line controller return signal in an operation state in real time; step two, when the return signal is abnormal for 60s, stopping supplying power to the wire controller, sending a fault to the mobile phone of the user, and finishing monitoring; when the return signal is normal, the voltage of the protection terminal is continuously monitored; step three, when the voltage of the protection terminal exceeds a critical value, stopping supplying power to the line controller, recovering power supply after 100ms, and then returning to the step one; and when the protective terminal voltage does not exceed the critical value, directly returning to the step one. The protection method can directly stop power supply when the line controller is in short circuit and send a fault signal, thereby completely avoiding the damage of the line controller short circuit to the master control. In addition, still can effectively protect line controller and main control board when the electric wire netting voltage fluctuates, and its self recovery function improves the convenience degree that the user used the product greatly.
Description
Technical Field
The invention relates to the field of air conditioner wire controllers, in particular to a method and a system for protecting an air conditioner wire controller.
Background
At present, the wire controller is used as an auxiliary device for controlling the air conditioner, and is widely applied to the market with unique advantages. Meanwhile, the problems of more after-sale problems and complicated solution also appear. Because of the direct and interior machine main control panel connection of line controller, the interior machine main control panel can even be damaged to line controller problem, for example the line controller short circuit leads to interior machine main control panel resistance fusing.
With the continuous development of the air conditioning industry, people increasingly diversify the air conditioning requirements, in the field of modern air conditioners, a multi-split air conditioner has the advantages of convenience in installation, flexibility in use, random adjustment and the like, generally, a multi-split air conditioning unit system comprises an outdoor side system (outdoor unit) and a plurality of controllable indoor side systems (indoor units), so that a stable and reliable control system must be built for realizing multi-split air conditioning control, and a communication system formed by MM1192 type chips has the advantages of high reliability, simplicity in programming, long communication distance, low price and the like. MM1192 is a chip conforming to Home Bus System (HBS) standard and having DATA transceiving function, and signal transceiving processing adopts AMI mode encoding, differential signal transmission, and twisted pair connection. Because the multi-connected wire controller adopts an HBS communication mode, namely a power supply carrier communication mode, and the conventional wire controller mostly adopts a screw connection mode, the short circuit problem is easy to occur. Current needleless protection schemes to the problem of line controller shorts. The technical scheme of overvoltage protection of the wire controller in the prior art is as follows: monitoring the protective end voltage of the line controller, stopping supplying power to the line controller if the protective end voltage is more than 0.36V, recovering power supply after preset time, mainly dealing with power grid fluctuation, and when dealing with the problem of short circuit of the line controller, because the power supply stopping time is too short, only 100ms, and the circuit is repeatedly switched on and off, the overload operation time of the resistor is too long, and the temperature is too high, so that the main control board is electrically blocked, and the effective protection cannot be realized. Namely, the overvoltage protection scheme in the prior art cannot solve the short-circuit protection problem of the line controller.
Disclosure of Invention
In order to solve the problems, the invention provides a short-circuit protection method for a line controller, so that a fault point can be accurately positioned, and the follow-up maintenance is facilitated.
According to an aspect of an embodiment of the present invention, there is provided an air conditioner line controller protection method, including: step one, supplying power to the wire controller, and monitoring a return signal of the wire controller in a running state in real time; and step two, when the return signal is abnormal, stopping supplying power to the wire controller and sending fault information.
Preferably, a check code is set in communication data between the internal unit and the line controller, and if the check code obtained after the data verification is received is inconsistent with the received check code, it is determined that the returned signal is abnormal.
Preferably, the communication period between the internal machine and the wire controller does not exceed 60 s.
Preferably, when the backtransmission signal is normal, the step one is returned to.
Preferably, the method further includes a third step of detecting a protection terminal voltage when the return signal is normal, stopping power supply to the line controller within a preset time when the protection terminal voltage is greater than a critical value, and resuming power supply to the line controller after the preset time elapses.
Preferably, the preset time is not less than 100 ms.
Preferably, the critical value is 0.36V.
Preferably, when the protective terminal voltage is not greater than the critical value, returning to the first step.
According to another aspect of embodiments of the present invention, there is provided an air conditioner line controller protection system including: a return signal acquisition module: the system is used for collecting a return signal in real time under the running state of the line controller; the protective end voltage acquisition control module: the system comprises a line controller, a power failure protection control module, a power failure protection module and a power failure protection module, wherein the line controller is used for acquiring a protection terminal voltage value in a running state of the line controller in real time and implementing power failure protection control based on the protection terminal voltage value; a stop and fault output module: and the controller is used for stopping supplying power to the wire controller and sending fault information when the return signal is abnormal.
Preferably, when the return signal acquired by the return signal acquisition module is abnormal, the stop and fault output module is started; and when the return signal is normal, starting the protective end voltage acquisition control module.
Therefore, whether the line controller works normally or not is determined by enabling the unit to detect the line controller return signal in the running state in real time. And when the return signal is abnormal, stopping supplying power to the line controller, and sending a fault to the mobile phone of the user to remind the user of the fault of the line controller. When just so having avoided the line controller short circuit, the main control board moves the problem of damage for a long time under adverse conditions to promote the operational reliability, accurate positioning fault point when playing energy-conserving effect, the follow-up maintenance of being convenient for.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic diagram of a line controller overvoltage protection process in the prior art;
fig. 2 is a schematic diagram of a short-circuit protection process of the line controller according to the first embodiment;
fig. 3 is a schematic flow chart of short-circuit protection and overvoltage protection of the line controller according to the second embodiment;
FIG. 4 is a block diagram of the system modules for short-circuit protection and overvoltage protection of the line controller according to the second embodiment;
fig. 5 is a diagram of an MM1192 communication circuit and an overvoltage protection circuit.
Reference numerals:
100-return signal acquisition module;
200-stop and fault output Module;
300-protective end voltage acquisition module;
400-overvoltage protection circuit diagram;
500-MM 1192 communication circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
According to an embodiment of the present invention, there is provided an air conditioner line controller protection method including: step one, supplying power to a line controller, and monitoring a line controller return signal in an operation state in real time; and step two, when the return signal is abnormal, stopping supplying power to the wire controller, sending a fault to the mobile phone of the user, finishing monitoring, and when the return signal is normal, returning to the step one. The return signal is monitored in real time and repeatedly, and real-time processing is carried out according to the abnormal condition of the return signal, so that the problem that the main control board is damaged during long-time running in a severe state when the line controller is in a short circuit state is solved, the running reliability is improved, the energy-saving effect is achieved, the fault point is accurately positioned, and follow-up maintenance is facilitated.
According to another embodiment of the invention, a method for protecting an air-conditioning wire controller is provided, and on the basis of the previous embodiment, a double protection method and a protection system for short-circuit protection and overvoltage protection of a multi-connected air-conditioning wire controller are provided. The technical scheme of the protection method is as follows: step one, supplying power to a line controller, and monitoring a line controller return signal in an operation state in real time; step two, when the return signal is abnormal, stopping supplying power to the wire controller, sending a fault to the mobile phone of the user, and finishing monitoring; when the return signal is normal, the voltage of the protection terminal is continuously monitored; step three, when the voltage of the protection end is higher than a critical value, stopping supplying power to the line controller, recovering the power supply after preset time, and then returning to the step one; and when the voltage of the protection terminal is normal, returning to the step one. Wherein the preset time is 100 ms.
The protection system includes: a return signal acquisition module: the controller is used for collecting the back-transmission signal of the line controller in the running state in real time; the protective end voltage acquisition module: the system is used for acquiring the voltage value of the protection end of the line controller in the running state in real time; a stop and fault output module: and the device is used for stopping supplying power to the wire controller and sending a fault to the mobile phone of the user when the return signal is abnormal. Whether the line controller is short-circuited or not is judged by collecting the return signal, and whether the line controller is overvoltage or not is judged by collecting the voltage value of the protection terminal, so that corresponding subsequent processing is performed, and the technical effects of short-circuit and overvoltage protection of the line controller are achieved.
The short-circuit fault of the line controller is generally not self-recoverable and has long duration. The overvoltage faults often occur in the power grid, can be recovered by power grid fluctuation, and are short in duration. Therefore, the protection measure of the short-circuit fault is to directly power off the line controller, and the protection measure of the overvoltage fault is to power off the line controller for a period of time.
Specifically, fig. 1 is a schematic view of an overvoltage protection process of a line controller in the prior art, which is used for supplying power to the line controller, monitoring a voltage value of a protection end of the line controller in real time, stopping supplying power to the line controller within a preset time if the voltage value is greater than 0.36V, and then recovering the power supply to continue monitoring; if the voltage value is less than or equal to 0.36V, the monitoring is continued. The overvoltage protection method is mainly used for solving the problem of instantaneous fluctuation of a power grid, the instantaneous fluctuation time of the voltage of the power grid is extremely short, preferably, the power supply stopping time of a line controller is set to be 100ms, and then normal power supply is recovered. This drive-by-wire ware overvoltage protection has self-healing, self-resuming function, improves the convenience degree that the user used the product greatly. However, the overvoltage protection has a self-recovery function, and if the line controller has a short-circuit fault, the power supply stopping time is only 100ms, and the circuit is repeatedly switched off, so that the resistance overload running time is too long, the temperature is too high, the resistance of the main control board is switched off, and effective protection cannot be achieved.
As shown in the schematic diagram of the short-circuit protection flow of the line controller shown in fig. 2, the present multi-line control adopts HBS communication, an internal unit communicates with the line controller in real time, each frame of data of the communication finally has a check code of two bytes, and if the check code obtained after the data check is received is not consistent with the received check code, it is determined that the return signal is abnormal. While the return signal is abnormal, there are two situations: a communication fault or a short circuit fault; 10-21 bytes (8 bits per byte) of one frame of data of multi-connected HBS (byte-by-wire) communication at present, wherein the time of each bit is 1/9600 s; in order to avoid the abnormal return signal caused by the communication fault, preferably, in the present embodiment, a communication cycle is set to 60s, and since the wired controller within 60s can perform 3400-7200 times of communication, the accidental abnormal return signal caused by short-time external interference is avoided, that is, if the return signal 60s is always abnormal, the short-circuit fault of the wired controller can be determined.
Since the short-circuit fault can cause the resistance of the main control board of the internal machine to be fused, as shown in fig. 2, once the short-circuit fault is monitored, the embodiment immediately stops supplying power to the line controller and cannot recover. Compared with the traditional mode, the frequency of frequent restarting of the wire controller is reduced, and the energy-saving effect is achieved; in addition, the invention can send a fault signal at the first time to remind maintenance personnel to process in time.
As shown in fig. 3, the schematic diagram of the short-circuit and overvoltage protection processes of the line controller is shown, in this embodiment, overvoltage protection and short-circuit protection of the line controller are organically combined together, and the return signal and the voltage signal are monitored in real time to perform subsequent corresponding processing, so that the dual functions of short-circuit protection and overvoltage protection are realized.
Specifically, after the power supply is started, firstly, the line controller is powered on, firstly, a communication return waveform signal is monitored, if the return signal is always abnormal after 60 seconds of monitoring, the power supply for the line controller is immediately stopped, and a fault signal is sent. The harm of short-circuit fault is great, and the line controller short circuit can lead to the internal unit main control board resistance fusing, system breakdown. Therefore, the short circuit fault must be immediately powered off, and further damage to the main control board is reduced. And secondly, if the returned signal is normal, continuing to monitor the protective end voltage of the line controller, if the protective end voltage exceeds a critical value, stopping supplying power to the line controller for 100 milliseconds, then continuing to supply power to the line controller, and returning to the first step. If the protective terminal voltage is normal, the first step is directly returned. Overvoltage faults often occur in power grid fluctuation, the power grid fluctuation time is short and is generally less than 100 milliseconds, therefore when overvoltage is monitored, the power supply to the wire controller is stopped for 100 milliseconds, a voltage fault period can be avoided, then power supply is continued, a self-recovery function is achieved, and the convenience degree of using products by users is greatly improved.
As shown in the block diagram of the short-circuit and overvoltage protection system of the line controller shown in fig. 4, corresponding to the flow diagram of fig. 3, in the first step, the return signal acquisition module 100 monitors the communication return signal in real time, if the communication return signal is abnormal and continues for 60s, the operation stop and fault output module 200 is operated, if the communication return signal is normal, the second step is entered, the protection terminal voltage acquisition module 300 is started, the protection terminal voltage of the line controller is monitored, if the protection terminal voltage is normal, the return signal acquisition module 100 is returned, and the process is repeated. And if the voltage of the protection end is higher than the critical value, stopping supplying power to the line controller for 100ms, then continuing supplying power to the line controller, returning to the return signal acquisition module, and repeating the cycle. The short-circuit fault is continuous, and once the short-circuit fault is found, the system is immediately shut down and cannot be recovered; the overvoltage fault is short-lived, once found, the overvoltage fault is recovered after being shut down for 100ms, and the overvoltage fault has a self-healing function.
The circuit schematic is shown in fig. 5, and fig. 5 lists only a portion of the communication schematic. The communication chip MM1192 is a core part of the circuit, the chip mainly comprises a transmitting part and a receiving part, and the working principle of the receiving part is as follows: MM1192 collects the differential signal on the bus through pin 15 and pin 16, compares the differential signal with 2.5V inside the chip, amplifies the comparison result and converts the amplified result into a digital signal of '1' and '0', and finally outputs the digital signal at pin 1; the working principle of the sending part is as follows: the MM1192 collects digital signals of '1' and '0' through the pin 6, then judges high and low levels through the trigger, starts an internal triode through the NAND gate to be conducted, and finally outputs analog differential signals at the pin 9 and the pin 10 to realize differential signal transmission of data.
Specifically, for the communication circuit 500, when receiving data, the differential mode signals XK _ a and XK _ B are transmitted to the pin 15 and the pin 16, wherein the common mode inductor IND2 filters the common mode signal at the input end, and the resistors R67 and R68 are used to adjust the amplitude of the signal, and if the resistor is increased, the amplitude of the received signal is decreased; the capacitors C47 and C48 are used for absorbing noise waves on the signals; when data is sent, signals are output through the pins 9 and 10; ZD 8-ZD 11 play a role in protection, and prevent the signal current on the bus from being overlarge and damaging the chip; at the line controller end, the MM1192 converts the received signal into a level of '0' and '1', transmits the level to the line controller through the pin 1, converts a return signal transmitted by the line controller into a differential signal through the pin 6, and transmits the differential signal; in addition, pin 5 may enable the chip, MM1192 operates normally once pin 5 is set low, MM1912 is not sending signals once pin 5 is set high.
Specifically, for the overvoltage circuit 400, voltage at a protection port of the line controller is collected, noise waves are filtered through a common-mode inductor, the overvoltage circuit 400 comprises a triode Q4-Q6, a resistor R87-R93 and a capacitor C51, once the collected voltage exceeds a critical value, an output level of an output terminal XK _ test is inverted, and the output level is sent to the line controller for overvoltage protection; and selecting a proper capacitance value of the capacitor C51 to realize the self-recovery of the XK _ PROTECT output level after the preset time.
In some embodiments, in the overvoltage protection scheme of the protection end of the line controller, the power supply stopping time is prolonged by software, for example, the time is prolonged from 100ms to 1s, so that the resistor has sufficient time for heat dissipation, and thus, the short-circuit protection of the line controller can also play a certain protection role.
In some embodiments, the specification of the main control resistor is changed, for example, the power value of the internal unit main control board resistor is increased, and the resistor can be prevented from being fused to a certain extent under the condition of short circuit.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A method for protecting a wired controller of an air conditioner is characterized by comprising the following steps:
step one, supplying power to the wire controller, and monitoring a return signal of the wire controller in a running state in real time;
and step two, when the return signal is abnormal, stopping supplying power to the wire controller and sending fault information.
2. The air conditioner line controller protecting method as set forth in claim 1,
and setting a check code in communication data between the internal machine and the wire controller, and judging that the returned signal is abnormal if the check code obtained after the data is checked is inconsistent with the received check code.
3. The air conditioner line controller protecting method as set forth in claim 2,
and the communication period between the internal machine and the wire controller does not exceed 60 s.
4. The air conditioner line controller protecting method as set forth in claim 1,
and when the return signal is normal, returning to the step one.
5. The air conditioner line controller protecting method as set forth in any one of claims 1 to 3, further comprising,
step three, when the return signal is normal, detecting the voltage of the protection terminal,
and when the voltage of the protection terminal is larger than a critical value, stopping supplying power to the wire controller within preset time, and recovering the power supply to the wire controller after the preset time.
6. The air conditioner line controller protecting method as set forth in claim 5,
the preset time is not less than 100 ms.
7. The air conditioner line controller protecting method as set forth in claim 5,
the critical value is 0.36V.
8. The air conditioner line controller protecting method as set forth in claim 5,
and when the protective terminal voltage is not greater than the critical value, returning to the step one.
9. An air conditioner drive-by-wire ware protection system which characterized in that includes:
a return signal acquisition module: the system is used for collecting a return signal in real time under the running state of the line controller;
the protective end voltage acquisition control module: the system comprises a line controller, a power failure protection control module, a power failure protection module and a power failure protection module, wherein the line controller is used for acquiring a protection terminal voltage value in a running state of the line controller in real time and implementing power failure protection control based on the protection terminal voltage value;
a stop and fault output module: and the controller is used for stopping supplying power to the wire controller and sending fault information when the return signal is abnormal.
10. The air conditioner drive-by-wire controller protection system of claim 9, wherein when the return signal collected by the return signal collection module is abnormal, the stop and fault output module is activated; and when the return signal is normal, starting the protective end voltage acquisition control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454912.1A CN111555240B (en) | 2020-05-26 | 2020-05-26 | Air conditioner wire controller protection method and protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454912.1A CN111555240B (en) | 2020-05-26 | 2020-05-26 | Air conditioner wire controller protection method and protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111555240A true CN111555240A (en) | 2020-08-18 |
| CN111555240B CN111555240B (en) | 2023-02-10 |
Family
ID=72006693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010454912.1A Active CN111555240B (en) | 2020-05-26 | 2020-05-26 | Air conditioner wire controller protection method and protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111555240B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268357A (en) * | 2020-10-12 | 2021-01-26 | 青岛海信日立空调系统有限公司 | Air conditioner communication control circuit and air conditioner |
| CN113339935A (en) * | 2021-05-08 | 2021-09-03 | 珠海格力电器股份有限公司 | Method and device for determining fault reason and fault detection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05244165A (en) * | 1992-02-28 | 1993-09-21 | Yamatake Honeywell Co Ltd | Fault control system for duplex channel of local area network |
| US20080184716A1 (en) * | 2006-11-24 | 2008-08-07 | Sanyo Electric Co., Ltd. | Storage type air conditioning system, and operation method and control program for storage type air conditioning system |
| WO2016037511A1 (en) * | 2014-09-10 | 2016-03-17 | 广州金升阳科技有限公司 | Power supply protection and control method |
| CN105974260A (en) * | 2016-07-06 | 2016-09-28 | 成都四威功率电子科技有限公司 | Bus communication fault detection protective apparatus and method |
| CN106152415A (en) * | 2016-08-05 | 2016-11-23 | 珠海格力电器股份有限公司 | The fault determination method of air conditioning system connection wiring and device |
| CN106410759A (en) * | 2015-07-29 | 2017-02-15 | 青岛海尔空调电子有限公司 | Method and device for communication overcurrent protection of AC wire controller |
-
2020
- 2020-05-26 CN CN202010454912.1A patent/CN111555240B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05244165A (en) * | 1992-02-28 | 1993-09-21 | Yamatake Honeywell Co Ltd | Fault control system for duplex channel of local area network |
| US20080184716A1 (en) * | 2006-11-24 | 2008-08-07 | Sanyo Electric Co., Ltd. | Storage type air conditioning system, and operation method and control program for storage type air conditioning system |
| WO2016037511A1 (en) * | 2014-09-10 | 2016-03-17 | 广州金升阳科技有限公司 | Power supply protection and control method |
| CN106410759A (en) * | 2015-07-29 | 2017-02-15 | 青岛海尔空调电子有限公司 | Method and device for communication overcurrent protection of AC wire controller |
| CN105974260A (en) * | 2016-07-06 | 2016-09-28 | 成都四威功率电子科技有限公司 | Bus communication fault detection protective apparatus and method |
| CN106152415A (en) * | 2016-08-05 | 2016-11-23 | 珠海格力电器股份有限公司 | The fault determination method of air conditioning system connection wiring and device |
Non-Patent Citations (1)
| Title |
|---|
| 鲁文其等: "空调室内外机通信电路的分析与设计", 《电子测量技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268357A (en) * | 2020-10-12 | 2021-01-26 | 青岛海信日立空调系统有限公司 | Air conditioner communication control circuit and air conditioner |
| CN113339935A (en) * | 2021-05-08 | 2021-09-03 | 珠海格力电器股份有限公司 | Method and device for determining fault reason and fault detection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111555240B (en) | 2023-02-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111555240B (en) | Air conditioner wire controller protection method and protection system | |
| CN103439577B (en) | The insulation resistance detection system of electric automobile power battery and detection method | |
| CN102315966B (en) | Service single board, fault detection and reporting method and system thereof | |
| CN105115105A (en) | Power failure detection method and system and air conditioner | |
| CN101706144A (en) | Method for judging communication failures of indoor unit and outdoor unit of varied-frequency air conditioner | |
| CN103344848A (en) | Three-phase power source default phase judgment and phase sequence detection device based on multiple microprocessors and detection method of three-phase power source default phase judgment and phase sequence | |
| EP3667860A1 (en) | Charging output protection circuit and method thereof | |
| WO2022184182A1 (en) | Air conditioner communication method allowing for automatic change of wireless communication channel | |
| CN207764335U (en) | A kind of detection circuit of leak current fault | |
| CN208241794U (en) | A kind of intelligent signal interruption alarm device | |
| CN109039704A (en) | CAN bus self-test prosthetic device and method | |
| CN210517767U (en) | Vehicle door and window switch system and vehicle | |
| CN209743185U (en) | System for protecting ceiling fan | |
| CN108512734B (en) | Bus communication circuit and multi-wire control panel | |
| CN217484482U (en) | Microampere surge protector leakage current on-line monitoring device | |
| CN206409418U (en) | A kind of blower fan control system | |
| CN212649094U (en) | Control system with motor protection function | |
| CN216870659U (en) | Intelligent ammeter capable of preventing electricity stealing and electricity stealing prevention system | |
| CN201846289U (en) | Soft starter device capable of intelligently patroling | |
| CN217846540U (en) | Fan fault detection circuit and clothes dryer | |
| CN220139226U (en) | Control circuit for over-temperature protection | |
| CN217060409U (en) | PFC circuit fault detection device and frequency conversion equipment | |
| CN214046089U (en) | Short circuit is prevented to lamp area controller | |
| CN110686358A (en) | Variable frequency air conditioner fault diagnosis method based on detection tool | |
| CN220156220U (en) | Phase-failure protection circuit and electromechanical device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20221020 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |