CN112393379A - Compressor driving circuit, power-off protection method thereof and air conditioner - Google Patents
Compressor driving circuit, power-off protection method thereof and air conditioner Download PDFInfo
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- CN112393379A CN112393379A CN202011303196.3A CN202011303196A CN112393379A CN 112393379 A CN112393379 A CN 112393379A CN 202011303196 A CN202011303196 A CN 202011303196A CN 112393379 A CN112393379 A CN 112393379A
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- relay
- compressor
- detecting
- electrical parameter
- judging whether
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
Abstract
The invention discloses a compressor driving circuit, a power-off protection method thereof and an air conditioner. Compared with the prior art, the invention eliminates the problem of serious potential safety hazard caused by factors such as high-voltage protection failure, overheating protection failure and the like of the compressor when the compressor relay is adhered in the prior art, and has the advantages of feasible logic, good universality and high reliability.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a compressor driving circuit, a power-off protection method thereof and an air conditioner.
Background
The contact adhesion of the contactor can be caused by the selection of the relay, the production process, the metal slag, unstable voltage, current and other factors, and the contactor can not be timely disconnected under the condition that the compressor is required to stop, so that the compressor continuously operates, and the pipe explosion of an air conditioner pipeline and the burning of a compression motor can be possibly caused.
There are some compressor protection technologies on the market, for example: the protection mode is that when the system pressure is found to be too high or overheated, a relay for controlling the compressor is switched off, so that the compressor is switched off. The protection mode can perform corresponding protection action on the compressor by disconnecting the relay when the system pressure reaches a preset threshold value.
This protection has problems: the compressor needs to be shut down, so that the compressor is in an ineffective state and cannot work normally. To effectively protect the compressor, the relay of the compressor must be guaranteed to effectively operate without failure, and the relay cannot guarantee 100% effective disconnection of the internal contact points in the actual application process. During actual work, when the compressor relay is adhered, the high-voltage protection of the compressor fails, and serious potential safety hazards exist.
Another compressor protection technique exists: when the adhesion of the compressor relay is judged, the output current or the temperature of the pipeline is judged to be larger than a set threshold value, the inner fan or the outer fan is started to operate, and in order to ensure the pressure balance of the air conditioning system, an alarm is sent to remind a user of repair, instead of stopping the unit after the adhesion protection occurs.
This protection has problems: when a user shuts down or stops at a temperature point, the unit cannot be stopped after the compressor relay is adhered, the air conditioner processes a normal running state at the moment, the displayed fault code is regarded as a false alarm fault, and the air conditioner always processes a refrigerating or heating state. The machine set can not be protected effectively after the machine set has the mechanical fault, and if the working condition wastes electric energy, the user experience is influenced.
Therefore, how to design a compressor driving circuit, a power-off protection method thereof and an air conditioner, which can also play a good protection role when the compressor relay is adhered, is a technical problem to be solved urgently in the industry.
Disclosure of Invention
The invention provides a compressor driving circuit, a power-off protection method thereof and an air conditioner, aiming at the problem that in the prior art, when a compressor relay is adhered, the protection effect is poor.
The technical scheme includes that the compressor driving circuit comprises a first relay and a second relay, wherein the first relay is used for controlling the on-off of a compressor, the second relay is connected with the first relay in series and is in a normally closed state, and when the first relay is in adhesion fault, the second relay is switched off.
Further, still include:
the current detection module is used for detecting the current magnitude of the output end of the first relay;
the sampling module is used for detecting the loop current of the compressor;
and the temperature detection module is used for detecting the temperature of the heat exchange tube of the compressor and the ambient temperature.
Further, still include:
the current detection module is used for detecting the current magnitude of the output end of the first relay;
the sampling module is used for detecting the loop current of the compressor;
and the pressure detection module is used for detecting the pipeline pressure of the compressor.
Further, still include:
and the self-checking module is used for detecting the current or voltage of the output end of the second relay.
The invention also provides a power-off protection method of the compressor driving circuit, wherein the power-off compressor driving circuit adopts the compressor driving circuit, and the power-off protection method comprises the following steps:
detecting an output electrical parameter of the first relay;
judging whether the output electrical parameter is greater than a specified electrical parameter;
and if so, acquiring the operation parameters of the compressor, and judging whether the first relay is in adhesion fault according to the operation parameters.
Further, the power-off protection method further comprises: and judging whether the output electrical parameter is greater than a specified electrical parameter, and if the output electrical parameter is less than or equal to the specified electrical parameter, judging that the first relay works normally.
Further, the operation parameters are the temperature of a heat exchange tube of the compressor and the ambient temperature;
the judging whether the first relay is adhered to the fault according to the operation parameters comprises the following steps:
calculating the temperature difference between the temperature of the heat exchange tube and the ambient temperature;
and judging whether the temperature difference is greater than a preset temperature difference, if so, judging that the first relay is adhered and the second relay is disconnected.
Further, the operation parameter is the pipeline pressure of the compressor;
the judging whether the first relay is adhered to the fault according to the operation parameters comprises the following steps:
and judging whether the pipeline pressure of the compressor is greater than a preset pressure threshold value, if so, judging that the first relay is adhered and disconnecting the second relay.
Further, still include:
and if the first relay is judged to work normally, detecting the output electrical parameter of the second relay, and judging whether the second relay has a fault according to the output electrical parameter.
The invention also provides a compressor, and the compressor adopts the compressor driving circuit.
Compared with the prior art, the invention has at least the following beneficial effects:
1. when the first relay of compressor takes place the adhesion, can break off compressor relay drive circuit through the second relay, play fine guard action.
2. Whether the second relay is in fault or not can be detected by the self-checking module, and the reliability and the safety of the driving circuit are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a compressor drive circuit according to the present invention;
FIG. 2 is a flow chart of a power-off protection method for a compressor driving circuit according to a first embodiment of the present invention;
fig. 3 is a flow chart of the self-check mode of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
Referring to fig. 1, the present invention provides a relay driving circuit for a compressor, which includes a first relay K1 for controlling the on/off of the compressor, and a second relay K2 connected in series with the first relay K1, wherein the first relay K1 is connected in series with the second relay K2, so that the compressor can be operated only when the first relay K1 and the second relay K2 are closed simultaneously.
The first relay K1 is a single-control relay and is mainly used for controlling the connection and disconnection of the compressor, when the first relay K1 is closed, the compressor works, and when the first relay K1 is disconnected, the compressor does not work. The second relay K2 is a double-control relay which is used as a standby switch, when the first relay K1 is not in fault, the second relay K2 does not need to participate in control and is always in a normally closed state, and the control of the compressor can be realized through the first controller K1. When first relay K1 takes place the adhesion trouble, the break-make of compressor can't be controlled to first relay K1 this moment, and second relay K2 participates in the control, breaks off second relay K2 to the disconnection compressor plays the guard action.
It still includes the air conditioner companion, and its main function has: statistics equipment power consumption is connected through wireless communication and user APP, and the time shows electric current, voltage, power consumption, and power consumption curve in the display cycle, earth leakage protection, the emergency power off function. And the second relay K2 is disconnected, so that the power supply of the compressor is cut off, and the compressor stops running.
The compressor relay driving circuit according to the first embodiment of the present invention further includes a current detection module, a sampling module, and a temperature detection module (not shown in the figure), wherein the current detection module is configured to detect a current at an output end of the first relay, the sampling module is configured to detect a loop current of the compressor, the temperature detection module is configured to detect a temperature of a heat exchange tube of the compressor and an ambient temperature, and each detection module may be configured as a specific detection circuit or may be configured as an electric meter for detection according to actual needs.
In a second embodiment of the present invention, the compressor driving circuit includes a current detection module, a sampling module, and a pressure detection module, wherein the current detection module is configured to detect a current at an output end of the first relay, the sampling module is configured to detect a loop current of the compressor, the pressure detection module is configured to detect a pipeline pressure of the compressor, and specific settings of the modules may be adjusted according to actual conditions.
Meanwhile, the compressor driving circuit of the present invention further includes a self-test module (not shown) connected to the output terminal of the second relay K2, for detecting the magnitude of the current or voltage at the output terminal of the second relay K2.
Referring to fig. 2, the present invention further provides a power-off protection method for a compressor driving circuit, wherein the compressor driving circuit employs the compressor driving circuit. Specifically, the method comprises the following steps:
detecting an output electrical parameter of the first relay;
judging whether the output electrical parameter is greater than a specified electrical parameter;
if so, acquiring the operation parameters of the compressor, and judging whether the first relay has the adhesion fault according to the operation parameters.
The output electrical parameter of the first relay is the output current of the first relay, the output electrical parameter is detected by the current detection module, the specified electrical parameter is the compressor loop current at the same time as the output electrical parameter, and the specified electrical parameter is switched on
The oversampling module detects, and if the output current of the first relay is larger than the loop current of the compressor, the operation parameter of the compressor is collected, and whether the first relay has the adhesion fault or not is judged according to the operation parameter. And if the output current of the first relay is less than or equal to the loop current of the compressor, judging that the first relay works normally.
In the first embodiment of the present invention, the operation parameters are the temperature of the heat exchange tube of the compressor and the ambient temperature, which are detected by the temperature detection module. The above-mentioned whether the adhesion trouble takes place for first relay according to the operating parameter still includes: and calculating the temperature difference between the temperature of the heat exchange tube and the ambient temperature, judging whether the temperature difference is greater than a preset temperature difference, if so, judging that the first relay has an adhesion fault, and disconnecting the second relay.
In a second embodiment of the present invention, the operation parameter is a line pressure of the compressor, which is detected by the pressure detection module. The above-mentioned whether the adhesion trouble takes place for first relay according to the operating parameter still includes: and judging whether the pipeline pressure of the compressor is greater than a preset pressure threshold value, if so, judging that the first relay is adhered, and disconnecting the second relay.
The second relay K2 has longer service life than the first relay K1, because when the compressor is normally controlled, K2 does not participate in control and is always in a conducting state, and the contact of the second relay is not repeatedly opened and closed, so that mechanical contacts in the relay cannot generate sparks and the like to cause adhesion. The first relay K1 is required to close the relay contact when the compressor is required to be started, and the compressor runs after the live wire is connected. When the compressor needs to be stopped, the relay contact is opened. The opening and closing actions are repeated for a long time, and due to the fact that contacts in the contactor are adhered together due to factors such as selection and matching of the relay, a production process, metal slag, unstable voltage and current and the like, MUC control failure is caused, and the compressor cannot be stopped all the time.
The air conditioner partner is further provided, and when the first relay is judged to be adhered, the air conditioner partner sends out an alarm to remind a user to overhaul the first relay and sends a warranty signal to the APP.
The present invention further includes a self-test mode for determining whether the second relay K2 is out of order by checking the operation state of the second relay K2 when the first relay K1 is normally operated.
Specifically, it includes: when first relay K1 normally worked, detect the electric current or the voltage size of second relay K2 output through the self-checking module, if the electric current or the voltage of second relay K2 output are zero, then judge second relay K2 trouble, send the early warning and remind the user to overhaul second relay K2 to close the compressor power. And if the current or the voltage at the output end of the second relay K2 is not zero, judging that the second relay K2 works normally, closing the first relay K1 and the second relay K2 and allowing the compressor to run.
The function of the second relay K2 may be set to "present" or "absent", and when the function is set to "absent", a warning and the severity of the danger are indicated.
The alarm comprises a buzzer or an alarm with auxiliary arrangement, and a plurality of second relays
K2, to enhance protection.
The invention further provides an air conditioner, and the air conditioner adopts the compressor relay driving circuit.
Compared with the prior art, the invention can solve the problem of serious potential safety hazard caused by the factors of failure of high-voltage protection and overheating protection of the compressor and the like when the relay of the compressor is adhered in the prior art through the second relay K2, thereby ensuring that the compressor can be powered off even if the relay has a fault; meanwhile, a self-checking mode is additionally arranged, so that the circuit is high in safety, good in reliability, simple and feasible in logic and high in universality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The compressor driving circuit comprises a first relay for controlling the on-off of the compressor, and is characterized by further comprising a second relay which is connected with the first relay in series and is in a normally closed state, and when the first relay is in adhesion fault, the second relay is disconnected.
2. The compressor drive circuit according to claim 1, further comprising:
the current detection module is used for detecting the current magnitude of the output end of the first relay;
the sampling module is used for detecting the loop current of the compressor;
and the temperature detection module is used for detecting the temperature of the heat exchange tube of the compressor and the ambient temperature.
3. The compressor drive circuit according to claim 1, further comprising:
the current detection module is used for detecting the current magnitude of the output end of the first relay;
the sampling module is used for detecting the loop current of the compressor;
and the pressure detection module is used for detecting the pipeline pressure of the compressor.
4. The compressor drive circuit according to claim 1, further comprising:
and the self-checking module is used for detecting the current or voltage of the output end of the second relay.
5. A power-off protection method of a compressor driving circuit employing the compressor driving circuit as claimed in claims 1 to 4, comprising the steps of:
detecting an output electrical parameter of the first relay;
judging whether the output electrical parameter is greater than a specified electrical parameter;
and if so, acquiring the operation parameters of the compressor, and judging whether the first relay is in adhesion fault according to the operation parameters.
6. The power down protection method of claim 5, further comprising: and judging whether the output electrical parameter is greater than a specified electrical parameter, and if the output electrical parameter is less than or equal to the specified electrical parameter, judging that the first relay works normally.
7. The power-off protection method as claimed in claim 5, wherein the operation parameters are a heat exchange tube temperature of the compressor and an ambient temperature;
the judging whether the first relay is adhered to the fault according to the operation parameters comprises the following steps:
calculating the temperature difference between the temperature of the heat exchange tube and the ambient temperature;
and judging whether the temperature difference is greater than a preset temperature difference, if so, judging that the first relay is adhered and the second relay is disconnected.
8. The power down protection method of claim 5, wherein the operating parameter is a line pressure of a compressor;
the judging whether the first relay is adhered to the fault according to the operation parameters comprises the following steps:
and judging whether the pipeline pressure of the compressor is greater than a preset pressure threshold value, if so, judging that the first relay is adhered and disconnecting the second relay.
9. The power down protection method of claim 6, further comprising:
and if the first relay is judged to work normally, detecting the output electrical parameter of the second relay, and judging whether the second relay has a fault according to the output electrical parameter.
10. An air conditioner characterized in that the air conditioner employs the compressor driving circuit as claimed in claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011303196.3A CN112393379A (en) | 2020-11-19 | 2020-11-19 | Compressor driving circuit, power-off protection method thereof and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011303196.3A CN112393379A (en) | 2020-11-19 | 2020-11-19 | Compressor driving circuit, power-off protection method thereof and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN112393379A true CN112393379A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011303196.3A Pending CN112393379A (en) | 2020-11-19 | 2020-11-19 | Compressor driving circuit, power-off protection method thereof and air conditioner |
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| CN (1) | CN112393379A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114582670A (en) * | 2022-03-07 | 2022-06-03 | 潍柴动力股份有限公司 | Method and system for judging aging of relay and preventing excessive heating of grating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06313606A (en) * | 1993-04-30 | 1994-11-08 | Sanyo Electric Co Ltd | Protection control device for air conditioner |
| JPH08182182A (en) * | 1994-12-28 | 1996-07-12 | Matsushita Electric Ind Co Ltd | Control of power circuit of air conditioner |
| CN102829529A (en) * | 2012-09-24 | 2012-12-19 | 宁波奥克斯空调有限公司 | Control device and control method for air conditioner auxiliary electrical heating |
| CN105332902A (en) * | 2015-12-01 | 2016-02-17 | 珠海格力电器股份有限公司 | Compressor relay adhesion protection method, compressor relay adhesion protection device and air conditioner |
| CN107919655A (en) * | 2017-12-13 | 2018-04-17 | 珠海格力电器股份有限公司 | Control circuit, control method and air-conditioning |
-
2020
- 2020-11-19 CN CN202011303196.3A patent/CN112393379A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06313606A (en) * | 1993-04-30 | 1994-11-08 | Sanyo Electric Co Ltd | Protection control device for air conditioner |
| JPH08182182A (en) * | 1994-12-28 | 1996-07-12 | Matsushita Electric Ind Co Ltd | Control of power circuit of air conditioner |
| CN102829529A (en) * | 2012-09-24 | 2012-12-19 | 宁波奥克斯空调有限公司 | Control device and control method for air conditioner auxiliary electrical heating |
| CN105332902A (en) * | 2015-12-01 | 2016-02-17 | 珠海格力电器股份有限公司 | Compressor relay adhesion protection method, compressor relay adhesion protection device and air conditioner |
| CN107919655A (en) * | 2017-12-13 | 2018-04-17 | 珠海格力电器股份有限公司 | Control circuit, control method and air-conditioning |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114582670A (en) * | 2022-03-07 | 2022-06-03 | 潍柴动力股份有限公司 | Method and system for judging aging of relay and preventing excessive heating of grating |
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Application publication date: 20210223 |
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