CN111005862B

CN111005862B - Pressure protection circuit, control method, and computer-readable storage medium

Info

Publication number: CN111005862B
Application number: CN201911300233.2A
Authority: CN
Inventors: 张晓东
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: 2019-12-16
Filing date: 2019-12-16
Publication date: 2022-02-15
Anticipated expiration: 2039-12-16
Also published as: EP3992458A4; WO2021120388A1; EP3992458B1; CN111005862A; EP3992458A1

Abstract

The invention provides a pressure protection circuit, a control method and a computer readable storage medium, wherein the pressure protection circuit comprises: the driving module is electrically connected with the compressor; the pressure switch module is arranged between the driving module and a power supply loop of the compressor and used for outputting a switch signal, and the switch signal is used for controlling the power supply loop to be connected or disconnected with the driving module; the control module is electrically connected with the driving module and the pressure switch module and is used for inputting a driving control signal to the driving module so as to enable the driving module to control the compressor to operate according to the driving control signal; the control module is further configured to: and when the switching signal is detected to be not matched with the bus signal of the driving module, controlling the compressor to stop running. Through the technical scheme of the invention, the compressor is prevented from operating under the working condition that the pressure switch module is invalid, and the abnormal operation probability is reduced, so that the safety and the reliability of the operation of the compressor can be improved.

Description

Pressure protection circuit, control method, and computer-readable storage medium

Technical Field

The invention relates to the technical field of compressor driving, in particular to a pressure protection circuit, a pressure protection control method and a computer readable storage medium.

Background

The pressure protection circuit and the pressure protection circuit are commonly used in an air conditioning system, but in the existing circuit, only the protection for overpressure is provided, when the circuit fails, an effective detection mode is not provided for judging whether the protection circuit is effective or not for protection, when the circuit really fails, the detection, judgment and processing cannot be performed, the pressure of the system can be continuously increased, and danger is caused.

Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.

Disclosure of Invention

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

It is therefore an object of the present invention to provide a pressure protection circuit.

Another object of the present invention is to provide a pressure protection control method.

It is yet another object of the present invention to provide a computer-readable storage medium.

In order to achieve the above object, a first aspect of the present invention provides a pressure protection circuit, including: the driving module is electrically connected with the compressor; the pressure switch module is arranged between the driving module and a power supply loop of the compressor and used for outputting a switch signal, and the switch signal is used for controlling the power supply loop to be connected or disconnected with the driving module; the control module is electrically connected with the driving module and the pressure switch module and is used for inputting a driving control signal to the driving module so as to enable the driving module to control the compressor to operate according to the driving control signal; the control module is further configured to: and when the switching signal is detected to be not matched with the bus signal of the driving module, controlling the compressor to stop running.

In the technical scheme, the pressure protection circuit comprises a driving module, a pressure switch module and a control module, wherein in the process of controlling the operation of the compressor, the pressure switch module can detect the working condition of the compressor, and when the abnormal operation of the compressor is detected, the power supply loop is controlled to be disconnected with the driving module so as to stop supplying power to the compressor, so that the compressor stops operating.

In order to prevent the control failure of the pressure switch module, the diagnostic function of the control module is added, whether the state of the detection switch signal is matched with the state of the bus signal of the driving module or not is detected, when the relation is detected to be matched, the control of the pressure switch module is kept in an effective state, when the relation is detected to be not matched, the control failure of the pressure switch module is indicated, the compressor is controlled to stop running at the moment, the compressor is prevented from running under the working condition that the pressure switch module fails, the abnormal running probability is reduced, and therefore the running safety and the running reliability of the compressor can be improved.

In the above technical solution, the compressor includes a pressure vessel, and the pressure switch module includes: the pressure switch is used for detecting a pressure signal of the pressure container and generating a corresponding switch signal according to the pressure signal; and the power supply control switch is arranged between the driving module and the power supply loop and is electrically connected with the pressure switch, and the power supply control switch is used for switching on the power supply loop and the driving module according to the switching signal or switching off the power supply loop and the driving module according to the switching signal.

In the technical scheme, the pressure switch module comprises a pressure switch and a power supply control switch, the pressure switch is specifically an electronic switch, the working condition of the compressor can be detected, specifically, whether the pressure signal of the pressure container is abnormal or not is detected to determine whether the compressor works abnormally or not, if the pressure signal is detected to be overlarge, the risk of pipe explosion of a compressor pipeline exists, at the moment, the pressure switch sends a switch-off signal to the power supply control switch, the power supply control switch is used for disconnecting the connection between the driving module and the power supply loop, so that power supply to the compressor is stopped, in order to prevent the power supply control switch from failing, the diagnosis function of the control module is increased, so that remedial measures can be taken in time when the power supply control switch fails, and the failure operation risk is reduced.

In particular, a pressure sensor may be provided at the outlet of the pressure vessel to detect a pressure signal with the pressure sensor.

In any of the above technical solutions, the power control switch includes any one of a relay, a contactor, and a semiconductor power switch.

Taking the relay as an example, because the relay has the risk of contact adhesion, if the relay adhesion after the closure, then no longer respond to pressure switch's switching signal or control module's control signal, also can not effectively break off after receiving the turn-off signal promptly, need control module direct control compressor stall this moment.

In any one of the above technical solutions, the control module includes: an integrated control chip arranged separately; or the control module comprises a first control chip and a second control chip, wherein the first control chip is electrically connected with the driving module and used for outputting a driving control signal to the driving module, the second control chip is electrically connected with the driving module to acquire a bus signal, the second control chip is also connected to a connection point between the pressure switch and the power control switch to acquire a switching signal, and the second control chip is also electrically connected with the first control chip to control the first control chip to stop outputting the driving control signal when detecting that the switching signal is not matched with the bus signal so as to stop the operation of the compressor.

In this technical solution, the control module may be implemented by using one integrated control chip, or by setting the two first control chips and the second control chip.

The adoption of one integrated control chip is favorable for simplifying the arrangement of a circuit, and because the pressure protection circuit in the related art is provided with the control chip with the same function as the first control chip, the second control chip limited by the application is added on the basis of the pressure protection circuit in the related art, so that the abnormity diagnosis detection and control are realized, and the preparation cost is reduced.

Furthermore, by arranging the second control chip, the compressor can still be effectively stopped when the first control chip is abnormal, and the safety of the system is ensured.

In any one of the above technical solutions, the driving module includes a driving chip, the driving chip is electrically connected to the first control chip and the second control chip, respectively, and the driving chip is used for unlocking the driving control signal; the second control chip is also used for: and controlling to close the driving chip.

In the technical scheme, the second control chip can also be used for directly controlling the drive chip of the drive module to be closed so as to ensure the reliability of controlling the compressor to stop running.

In any one of the above technical solutions, the pressure switch is disposed at an outlet of the pressure vessel, and the pressure switch further includes: a pressure sensor for detecting a pressure signal; the microprocessor is electrically connected with the pressure sensor, is used for detecting that the pressure signal is greater than or equal to a pressure threshold value, adopts a turn-off signal to configure a switch signal, and the turn-off signal is used for controlling the power supply control switch to be switched off; the second control chip is also used for: and if the turn-off signal is detected and the bus signal does not enter the attenuation state, determining that the switch signal is not matched with the bus signal.

In the technical scheme, taking a relay as an example, if a pressure switch detects that a pressure signal is greater than or equal to a pressure threshold, that is, overvoltage is detected, a turn-off signal is sent to the relay, and meanwhile, a second control chip receives a power-off signal, at the moment, the second control chip actively detects the change condition of the bus voltage of a driving module, if the bus voltage continuously drops, the relay is normally turned off, if the bus voltage does not change, the relay is not normally turned off, at the moment, the second control chip turns off a compressor driving chip, that is, a first control chip, and the first control chip turns off and stops outputting the driving control signal by the driving module.

Wherein, the pressure threshold value can be the maximum pressure value which can ensure the normal operation of the compressor.

In any one of the above technical solutions, the second control chip is further configured to: if the shutdown signal is detected and the bus signal enters an attenuated state, determining that the switch signal matches the bus signal, and the microprocessor is further configured to: configuring a switch signal by adopting a closing signal, wherein the closing signal is used for controlling the power supply to control the switch to be closed; the second control chip is also used for: and if the closing signal is detected and the bus signal enters the increasing state, determining that the switching signal is matched with the bus signal.

In the technical scheme, whether the detection switch signal is matched with the bus signal of the driving module or not is detected, the compressor is controlled to stop running under the condition of limiting unmatched working conditions, and the matched working conditions correspond to the working conditions of normal running of the compressor, so that the integrity of pressure protection control is ensured.

In any one of the above technical solutions, the method further includes: the control power supply is used for supplying power to the control module; the control power supply is further configured to: and supplying power to the pressure switch, and enabling the pressure switch to generate a corresponding switch signal according to the power supply signal of the control power supply and the detection result of the pressure signal, so as to output the power supply signal to the power supply control switch according to the switch signal or stop outputting the power supply signal.

In the technical scheme, the power control switch determines to be switched on or switched off according to whether a power supply signal for controlling the power supply is received or not, under normal working conditions, if the power supply signal is stopped being received, the power control switch can be automatically switched off, under abnormal working conditions, such as the contact adhesion, the power control switch is still in a conducting state even if the power supply signal is stopped after the contact is switched on and the adhesion occurs, under the condition, the compressor has the risk that the running pressure is continuously increased, and the compressor is controlled to stop running to avoid the risk as much as possible.

In any one of the above technical solutions, the driving module includes an intelligent power module and/or an IGBT module, the intelligent power module and/or the IGBT module are provided with a transistor assembly, and the first control chip is further configured to: and configuring a pulse width modulation signal as a driving control signal, wherein the pulse width modulation signal is used for controlling the transistor component to be switched on and off.

In the technical scheme, the driving module may include a rectifier, a PFC module, an IPM (intelligent power module) module, or only an IPM module, and the driving module outputs a driving control signal to the driving module, so that the driving control of the motor of the compressor is realized while the power supply circuit is turned on, and thus the motor of the compressor is controlled to stop operating by stopping outputting the driving control signal, so as to ensure the controllability of the operation of the compressor.

The technical scheme of the second aspect of the invention provides a pressure protection control method, which comprises the following steps: and when the bus signal of the driving module is detected to be not matched with the working state of the pressure switch module, controlling the compressor to stop running.

In the technical scheme, the pressure switch module can detect the working condition of the compressor in the process of controlling the operation of the compressor, and when the abnormal operation of the compressor is detected, the power supply loop is controlled to be disconnected with the driving module so as to stop supplying power to the compressor, so that the compressor stops operating.

In order to prevent the control failure of the pressure switch module, the diagnostic function is added, whether the state of the switch signal is matched with the state of the bus signal of the driving module or not is detected, when the relation is detected to be matched, the control of the pressure switch module is indicated to be kept in an effective state, when the relation is detected to be not matched, the control failure of the pressure switch module is indicated, the compressor is controlled to stop running at the moment, the compressor is further prevented from running under the working condition that the pressure switch module fails, the abnormal running probability is reduced, and therefore the running safety and the running reliability of the compressor can be improved.

In above-mentioned technical scheme, the compressor includes pressure vessel, detects that drive module's generating line signal and pressure switch module's operating condition do not match, and control compressor stall specifically includes: responding to the acquired turn-off signal output by the pressure switch module, and detecting a bus signal; and if the bus signal is detected not to fall to the voltage threshold value within the specified time, determining that the working states are not matched to control the compressor to stop running, wherein the turn-off signal is generated when the pressure switch module detects that the pressure signal of the pressure container is greater than or equal to the pressure threshold value.

In the technical scheme, the relay is taken as an example, if overvoltage is detected, the change condition of the bus voltage of the driving module is triggered and detected, if the bus voltage continuously drops, the relay is normally disconnected, if the bus voltage does not change, the relay is not normally disconnected, at the moment, the driving control signal is controlled to stop being output, so that the relay is prevented from failing, the diagnosis function of the control module is increased, so that remedial measures are taken in time when the power control switch fails, and the failure operation risk is reduced.

In any one of the above technical solutions, detecting that a bus signal of the driving module is not matched with a working state of the pressure switch module, and controlling the compressor to stop running specifically includes: responding to the starting signal, and controlling the driving module to output a driving control signal before the pressure switch module operates; and if the bus signal is detected to be in the increasing state, determining that the working states are not matched, and controlling the compressor to stop running.

In the technical scheme, whether a bus signal of the driving module is matched with the working state of the pressure switch module or not can be detected at the stage of controlling the compressor to start to operate, for example, the pressure switch does not output a closed switch signal to the relay after the compressor is started, and if the bus voltage of the driving module reaches a larger voltage value, the relay can be considered to be abnormal in operation, so that the compressor is controlled to stop operating continuously, and the safety of the compressor in operation is ensured.

In any one of the above technical solutions, controlling the compressor to stop operating specifically includes: and controlling to stop outputting a driving control signal to the driving module and/or controlling to close a driving chip of the driving module, wherein the driving module further comprises an intelligent power module and/or an IGBT module, the intelligent power module and/or the IGBT module are respectively provided with a transistor component, the pulse width modulation signal is configured into the driving control signal, and the pulse width modulation signal is used for controlling the on-off of the transistor component.

In any one of the above technical solutions, the pressure switch module includes a relay disposed between the driving module and the power supply circuit, and the pressure protection control method further includes: and if the bus signal is detected not to be matched with the working state, determining that the relay is abnormal and generating abnormal alarm information.

According to the technical scheme, when the relay is detected to be abnormal, abnormal alarm information is transmitted to a user to guide the user to solve the abnormality in time.

A third aspect of the present invention provides a computer-readable storage medium, where a computer program is executed by a processor to implement the steps of the pressure protection control method defined in any one of the above technical solutions, so that the technical effects of the control method defined in any one of the above technical solutions are achieved, and details are not repeated herein.

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 schematic of a pressure protection circuit according to one embodiment of the present invention;

FIG. 2 shows a circuit schematic of a pressure protection circuit according to yet another embodiment of the present invention;

FIG. 3 shows a flow diagram of a pressure protection control method according to an embodiment of the invention;

FIG. 4 shows a flow diagram of a pressure protection control method according to yet another embodiment of the invention;

FIG. 5 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:

10 compressor, 20 power supply circuit, 30 drive module, 302 drive chip, 40 pressure switch module, 402 pressure switch, 404 relay, 50 control module, 502 first control chip, 504 second control chip, 60 control power supply.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application 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.

Some embodiments according to the invention are described below with reference to fig. 1 to 5.

Example one

As shown in fig. 1, a pressure protection circuit according to an embodiment of the present invention for protecting an operation of a compressor 10, the compressor 10 including a pressure vessel, the pressure protection circuit including: a power supply circuit 20, a driving module 30, a pressure switch module 40 and a control module 50.

Wherein the driving module 30 is electrically connected to the compressor 10.

The pressure switch module 40 is disposed between the driving module 30 and the power supply circuit 20 of the compressor 10, and is configured to output a switch signal, where the switch signal is used to control the power supply circuit 20 and the driving module 30 to be connected or disconnected.

As shown in fig. 2, the pressure switch module 40 includes a pressure switch 402 and a power control switch, the pressure switch 402 is electrically connected to detect a pressure signal of the pressure container and generate a corresponding switch signal according to the pressure signal, and the power control switch is disposed between the driving module 30 and the power supply circuit 20 and is configured to close according to the switch signal to enable the power supply circuit 20 to be connected to the driving module 30 or open according to the switch signal to enable the power supply circuit 20 to be disconnected from the driving module 30.

The power control switch includes any one of a relay 404, a contactor, and a semiconductor power switch.

The pressure switch 402 is specifically an electronic switch, and can detect a working condition of the compressor 10, specifically detect whether a pressure signal of a pressure container is abnormal to determine whether the compressor 10 works abnormally, if it is detected that the pressure signal is too large, there is a risk of pipe explosion of a pipeline of the compressor 10, at this time, the pressure switch 402 sends a switch-off switch signal to the power control switch, so that the power control switch disconnects the connection between the driving module 30 and the power supply loop 20 to stop supplying power to the compressor 10, and in order to prevent the power control switch from failing, the diagnostic function of the control module 50 is added, so that remedial measures can be taken in time when the power control switch fails to reduce the risk of failure operation.

As an embodiment for detecting the operation condition of the compressor 10, a pressure switch 402 is disposed at the outlet of the pressure container, and the pressure switch 402 further includes: a pressure sensor for detecting a pressure signal; the microprocessor is electrically connected with the pressure sensor, is used for detecting that the pressure signal is greater than or equal to a pressure threshold value, adopts a turn-off signal to configure a switch signal, and the turn-off signal is used for controlling the power supply 60 to control the switch to be switched off; the second control chip 504 is further configured to: and if the turn-off signal is detected and the bus signal does not enter the attenuation state, determining that the switch signal is not matched with the bus signal.

In this embodiment, because the relay 404 has a risk of contact adhesion, if the relay 404 is adhered after being closed, the relay does not respond to the switching signal of the pressure switch 402 or the control signal of the control module 50, that is, the relay cannot be effectively disconnected after receiving the turn-off signal, at this time, the control module 50 needs to directly control the compressor 10 to stop operating, if the pressure switch 402 detects that the pressure signal is greater than or equal to the pressure threshold, overvoltage is detected, the turn-off signal is sent to the relay 404, and at the same time, the second control chip 504 receives the power-off signal, at this time, the second control chip 504 actively detects a change condition of the bus voltage of the driving module 30, if the bus voltage continuously decreases, it indicates that the relay 404 is normally disconnected, if the bus voltage does not change, it indicates that the relay 404 is not normally disconnected, at this time, the second control chip 504 turns off the driving chip 302 of the compressor 10, that is the first control chip 502, the first control chip 502 turns off the output driving module 30 from outputting the driving control signal.

Wherein, the pressure threshold may be a maximum pressure value capable of ensuring the normal operation of the compressor 10.

The control module 50 is electrically connected to the driving module 30 and the pressure switch module 40, and is configured to input a driving control signal to the driving module 30.

The drive module 30 is further configured to: the operation of the compressor 10 is controlled according to the driving control signal.

The control module 50 is further configured to: and detecting that the switching signal is not matched with the bus signal of the driving module 30, and controlling the compressor 10 to stop running.

The pressure switch module 40 can detect an operating condition of the compressor 10 during the operation of the compressor 10, and control the power supply circuit 20 to be disconnected from the driving module 30 to stop supplying power to the compressor 10 to stop the operation of the compressor 10 when the abnormal operation of the compressor 10 is detected.

In order to prevent the control failure of the pressure switch module 40, the diagnostic function of the control module 50 is added, whether the state of the switch signal is matched with the state of the bus signal of the driving module 30 is detected, when the relation is detected to be matched, the control of the pressure switch module 40 is indicated to be in an effective state, when the relation is detected to be not matched, the control of the pressure switch module 40 is indicated to be failed, the compressor 10 is controlled to stop running at the moment, the compressor 10 is further prevented from running under the working condition that the pressure switch module 40 fails, the abnormal running probability is reduced, and therefore the running safety and reliability of the compressor 10 can be improved.

Example two

The control module 50 is further defined on the basis of the first embodiment, and the control module 50 includes: the integrated control chip is independently arranged, and the adoption of one integrated control chip is beneficial to simplifying the arrangement of the circuit.

Specifically, by providing the integrated control chip, the integrated control chip diagnoses the switching signal (for example, whether the +12V voltage is input) and the bus voltage without adding a chip having a diagnosis function.

EXAMPLE III

As shown in fig. 2, based on the first embodiment, the control module 50 is further defined, including: the first control chip 502 is electrically connected to the driving module 30, and is configured to output a driving control signal to the driving module 30; the second control chip 504 is electrically connected with the driving module 30 to obtain a bus signal; the second control chip 504 is also connected to a connection point between the pressure switch 402 and the power control switch to obtain a switching signal; the second control chip 504 is also electrically connected to the first control chip 502 to control the first control chip 502 to stop outputting the driving control signal when detecting that the switching signal is not matched with the bus signal, so as to stop the operation of the compressor 10.

In this embodiment, since the pressure protection circuit in the related art is already provided with a control chip having the same function as the first control chip 502, the second control chip 504 defined in the present application is added to the pressure protection circuit in the related art, so that the abnormality diagnosis detection and control are realized, and the manufacturing cost is reduced.

In addition, the second control chip 504 can also directly control the driving module 30, which specifically includes: the driving module 30 includes a driving chip 302, the driving chip 302 is electrically connected to the first control chip 502 and the second control chip 504, respectively, and the driving chip 302 is used for unlocking the driving control signal; the second control chip 504 is further configured to: control turns off the driver chip 302.

In this embodiment, the second control chip 504 can also directly control the driving chip 302 of the driving module 30 to close, so as to ensure the reliability of controlling the compressor 10 to stop operating, and by setting the second control chip 504, the compressor 10 can still be effectively stopped when the first control chip 502 is abnormal, so as to ensure the safety of the system.

The second control chip 504 is further configured to: if the shutdown signal is detected and the bus signal enters an attenuated state, determining that the switch signal matches the bus signal, and the microprocessor is further configured to: configuring a switch signal by using a closing signal, wherein the closing signal is used for controlling the power supply 60 to control the switch to be closed; the second control chip 504 is further configured to: and if the closing signal is detected and the bus signal enters the increasing state, determining that the switching signal is matched with the bus signal.

In this embodiment, whether the switching signal is matched with the bus signal of the driving module 30 is detected, and when the compressor 10 is controlled to stop operating under the condition that the unmatched operating condition is defined, the matched operating condition corresponds to the operating condition that the compressor 10 normally operates, so that the integrity of the pressure protection control is ensured.

Specifically, the second control chip 504 with the diagnostic function is added to detect the bus voltage value of the driving module 30 when the pressure switch 402 is activated by the second control chip 504 to determine whether the contact of the relay 404 is effectively disconnected, and when the contact of the relay 404 is detected to be stuck, the second control chip 504 turns off the first control chip 502 of the driving module 30, so that the first control chip 502 turns off the control signal of the relay 404 and the driving control signal of the compressor 10.

On the basis of the first and second embodiments, the pressure protection circuit further includes: a control power supply 60 for supplying power to the control module 50; the control power supply 60 is also used to: the pressure switch 402 is powered and the pressure switch 402 generates a corresponding switch signal according to the power supply signal of the control power supply 60 and the detection result of the pressure signal, so as to output the power supply signal to the power supply control switch according to the switch signal or stop outputting the power supply signal.

In this embodiment, the power control switch determines to be turned on or off according to whether the power supply signal of the control power supply 60 is received, under a normal condition, if the power supply signal is stopped being received, the power control switch is automatically turned off, under an abnormal condition, for example, the contact adhesion mentioned above occurs, and after the contact conduction and adhesion occur, the power control switch is still in a conducting state even though the power supply signal is stopped, in which case the compressor 10 has a risk of continuously increasing the operating pressure, and the compressor 10 is controlled to stop operating, so as to avoid the risk as much as possible.

In any of the above embodiments, the driving module 30 includes an intelligent power module and/or an IGBT module, the intelligent power module and/or the IGBT module are provided with a transistor component, and the first control chip 502 is further configured to: and configuring a pulse width modulation signal as a driving control signal, wherein the pulse width modulation signal is used for controlling the transistor component to be switched on and off.

In this embodiment, the driving module 30 may include a rectifier, a PFC module, an IPM (intelligent power module) module, etc., or may include only the IPM module, and the driving module 30 outputs a driving control signal to control the driving of the motor of the compressor 10 while the power supply circuit 20 is turned on, so that the motor of the compressor 10 can be controlled to stop operating by stopping outputting the driving control signal, so as to ensure the controllability of the operation of the compressor 10.

Example four

The pressure protection control method of the compressor is further described on the basis of defining a pressure protection circuit, and fig. 3 shows the pressure protection control method according to one embodiment of the invention, which includes:

step 602, detecting that the bus signal of the driving module is not matched with the working state of the pressure switch module, and controlling the compressor to stop running.

In the embodiment, when the compressor is controlled to operate, the pressure switch module can detect the working condition of the compressor, and when the compressor is detected to operate abnormally, the power supply loop is controlled to be disconnected from the driving module so as to stop supplying power to the compressor, so that the compressor stops operating.

In any of the above embodiments, the controlling the compressor to stop operating specifically includes: and controlling to stop outputting a driving control signal to the driving module and/or controlling to close a driving chip of the driving module, wherein the driving module comprises an intelligent power module and/or an IGBT module, the intelligent power module and/or the IGBT module are respectively provided with a transistor component, the pulse width modulation signal is configured into the driving control signal, and the pulse width modulation signal is used for controlling the on-off of the transistor component.

In this embodiment, the driving module may include a rectifier, a PFC module, an IPM (intelligent power module) module, or only the IPM module, and the driving module outputs a driving control signal to the driving module, so that the driving control of the motor of the compressor is realized while the power supply circuit is turned on, and thus the motor of the compressor can be controlled to stop operating by stopping outputting the driving control signal, so as to ensure the controllability of the operation of the compressor.

EXAMPLE five

Based on the detection to the pressure signal of pressure vessel, confirm that the generating line signal of drive module does not match with the operating condition of pressure switch module, control compressor out of service specifically includes: responding to the acquired turn-off signal output by the pressure switch module, and detecting a bus signal; and if the bus signal is detected not to fall to the voltage threshold value within the specified time, determining that the working states are not matched to control the compressor to stop running, wherein the turn-off signal is generated when the pressure switch module detects that the pressure signal of the pressure container is greater than or equal to the pressure threshold value.

In this embodiment, taking a relay as an example, if overvoltage is detected, the change condition of the bus voltage of the driving module is triggered and detected, if the bus voltage continuously drops, it indicates that the relay is normally turned off, and if the bus voltage does not change, it indicates that the relay is not normally turned off, at this time, the control stops outputting the driving control signal to prevent the relay from failing, and the diagnostic function of the control module is added to take remedial measures in time when the power control switch fails to work, so as to reduce the failure operation risk.

EXAMPLE six

In the starting-up stage, whether the bus signal of the driving module is matched with the working state of the pressure switch module or not can be detected by adjusting the control program, and the method specifically comprises the following steps: responding to the starting signal, and controlling the driving module to output a driving control signal before the pressure switch module operates; and if the bus signal is detected to be in the increasing state, determining that the working states are not matched, and controlling the compressor to stop running.

In this embodiment, it may also be detected whether the bus signal of the driving module matches the working state of the pressure switch module at the stage of controlling the compressor to start operating, for example, after the compressor is started, the pressure switch has not yet output a closed switch signal to the relay, and it has been detected that the bus voltage of the driving module reaches a large voltage value, it may also be considered that the relay is working abnormally, so as to control the compressor to stop operating continuously, so as to ensure the safety of the compressor operating.

On the basis of the third to fifth embodiments, a further supplement to the pressure protection control method in the present application further includes: the pressure switch module comprises a relay arranged between the driving module and the power supply loop, and the pressure protection control method further comprises the following steps: and if the bus signal is detected not to be matched with the working state, determining that the relay is abnormal and generating abnormal alarm information.

In the embodiment, when the relay is detected to be abnormal, abnormal alarm information is transmitted to a user so as to guide the user to solve the abnormality in time.

EXAMPLE seven

Based on the pressure protection circuit in the first to third embodiments, fig. 4 shows a pressure protection control method according to another embodiment of the invention, including:

and step S702, the second control chip operates normally.

Step S704 detects whether or not a power supply signal is output to the relay, and if yes, step S712 is executed, and if no, step S706 is executed.

Step S706, detecting whether the bus signal is decreased to the voltage threshold within a specified time period, if yes, performing step S710, and if no, performing step S708.

And step S708, judging whether the relay contact is adhered or not, turning off a driving chip of the compressor, and simultaneously controlling the first control chip to stop outputting the relay control signal and the driving control signal.

In step S710, the compressor stops operating.

In step S712, the compressor operates normally.

Specifically, a compressor is arranged in the air conditioning system and comprises a pressure container, the pressure in the pressure container can change when the compressor works, and when a pressure protection circuit is disconnected through a pressure switch, a power supply signal of a relay is disconnected, so that a contact of the relay is disconnected, a power supply of a power part of a compressor driving module is disconnected, and the compressor is stopped.

And after the pressure switch device acts, the second control chip detects that the +12V power supply signal of the relay is disconnected, detects the bus voltage Vdc in the driving module at the moment, if the relay contact is normally disconnected, the Vdc can continuously drop, and if the relay contact is adhered, the Vdv voltage keeps the current state. And when the second control chip detects that the Vdc voltage does not fall to the set voltage value within the set time, the driving chip of the compressor is turned off to stop the compressor.

When the second control chip detects the adhesion of the relay, the first control chip is informed to turn off the compressor driving signal and the relay control signal.

When detecting that the over-voltage protection circuit is working, namely the Vdc voltage is effectively reduced, the second control chip operates normally without other actions.

When overpressure occurs, relay contacts are adhered, the pressure protection circuit fails, the control module detects the adhesion of the relay, the driving chip of the compressor is turned off, the compressor is stopped, the first control chip is turned off to obtain a driving signal and a relay control signal, the system enters a safe state, and the safety and the reliability of the system are guaranteed.

As shown in fig. 5, an embodiment of the present invention further provides a computer-readable storage medium 800, where a computer program 802 is stored in the computer-readable storage medium 800, and when executed by a processor, the computer program 802 implements the steps of the cooking control method disclosed in any of the above embodiments, so that the technical effects of the cooking control method in any of the above embodiments are achieved, and are not repeated herein.

In this embodiment, the computer program 802 realizes the following steps when executed by a processor:

and when the bus signal of the driving module is detected to be not matched with the working state of the pressure switch module, controlling the compressor to stop running.

In the above embodiment, the compressor includes a pressure vessel, detects that the bus signal of the driving module is not matched with the operating state of the pressure switch module, and controls the compressor to stop operating, including: responding to the acquired turn-off signal output by the pressure switch module, and detecting a bus signal; and if the bus signal is detected not to fall to the voltage threshold value within the specified time, determining that the working states are not matched to control the compressor to stop running, wherein the turn-off signal is generated when the pressure switch module detects that the pressure signal of the pressure container is greater than or equal to the pressure threshold value.

In any of the above embodiments, detecting that the bus signal of the driving module is not matched with the operating state of the pressure switch module, and controlling the compressor to stop operating specifically includes: responding to the starting signal, and controlling the driving module to output a driving control signal before the pressure switch module operates; and if the bus signal is detected to be in the increasing state, determining that the working states are not matched, and controlling the compressor to stop running.

In any of the above embodiments, the controlling the compressor to stop operating specifically includes: and controlling to stop outputting a driving control signal to the driving module, wherein the driving module comprises an intelligent power module and/or an IGBT module, the intelligent power module and/or the IGBT module are provided with transistor components, the pulse width modulation signal is configured into a driving control signal, and the pulse width modulation signal is used for controlling the on-off of the transistor components.

In any one of the above embodiments, the pressure switch module includes a relay disposed between the driving module and the power supply circuit, and the pressure protection control method further includes: and if the bus signal is detected not to be matched with the working state, determining that the relay is abnormal and generating abnormal alarm information. And when the relay is detected to be abnormal, transmitting abnormal alarm information to a user so as to guide the user to solve the abnormality in time.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., 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 invention. In this specification, the schematic representations of the terms used above 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 pressure protection circuit adapted for use with a compressor, comprising:

the driving module is electrically connected with the compressor;

the pressure switch module is arranged between the driving module and a power supply loop of the compressor and used for outputting a switch signal, and the switch signal is used for controlling the power supply loop and the driving module to be connected or disconnected;

the control module is electrically connected with the driving module and the pressure switch module and is used for inputting a driving control signal to the driving module so as to enable the driving module to control the compressor to operate according to the driving control signal;

the control module is further configured to: detecting whether the state of the switching signal is matched with the state of a bus signal of the driving module;

detecting that the state of the switch signal is matched with the bus signal of the driving module, and indicating that the pressure switch module is controlled to keep an effective state;

and when the switching signal is detected to be not matched with the bus signal of the driving module, the pressure switch module is indicated to fail to control, and the compressor is controlled to stop running.

2. The pressure protection circuit of claim 1, wherein the compressor includes a pressure vessel, the pressure switch module comprising:

the pressure switch is used for detecting a pressure signal of the pressure container and generating a corresponding switch signal according to the pressure signal;

and the power supply control switch is arranged between the driving module and the power supply loop and is electrically connected with the pressure switch, and the power supply control switch is used for switching on the power supply loop and the driving module according to the switching signal or switching off the power supply loop and the driving module according to the switching signal.

3. The pressure protection circuit of claim 2,

the power control switch comprises any one of a relay, a contactor and a semiconductor power switch.

4. The pressure protection circuit of claim 2,

the control module includes: an integrated control chip arranged separately; or

The control module comprises a first control chip and a second control chip,

the first control chip is electrically connected with the driving module and used for outputting the driving control signal to the driving module, the second control chip is electrically connected with the driving module to obtain the bus signal, the second control chip is further connected to a connection point between the pressure switch and the power control switch to obtain the switch signal, and the second control chip is further electrically connected with the first control chip to control the first control chip to stop outputting the driving control signal when the switch signal is detected not to be matched with the bus signal, so that the compressor stops operating.

5. The pressure protection circuit according to claim 4, wherein the driving module comprises a driving chip, the driving chip is electrically connected with the first control chip and the second control chip respectively, and the driving chip is used for unlocking the driving control signal;

the second control chip is further configured to: and controlling to close the driving chip.

6. The pressure protection circuit of claim 4, wherein the pressure switch is disposed at an outlet of the pressure vessel, the pressure switch further comprising:

a pressure sensor for detecting the pressure signal;

the microprocessor is electrically connected with the pressure sensor and used for detecting that the pressure signal is greater than or equal to a pressure threshold value and configuring the switch signal by adopting a turn-off signal, and the turn-off signal is used for controlling the power supply control switch to be switched off;

the second control chip is further configured to: and if the turn-off signal is detected and the bus signal does not enter an attenuation state, determining that the switching signal is not matched with the bus signal.

7. The pressure protection circuit of claim 6,

the second control chip is further configured to: if the turn-off signal is detected and the bus signal enters an attenuated state, determining that the switching signal matches the bus signal, an

The microprocessor is further configured to: configuring the switch signal by adopting a closing signal, wherein the closing signal is used for controlling the power supply control switch to be closed;

the second control chip is further configured to: and if the closing signal is detected and the bus signal enters an increasing state, determining that the switching signal is matched with the bus signal.

8. The pressure protection circuit according to any one of claims 2 to 7, further comprising:

the control power supply is used for supplying power to the control module;

the control power supply is further configured to: and supplying power to the pressure switch, and enabling the pressure switch to generate the corresponding switch signal according to the power supply signal of the control power supply and the detection result of the pressure signal, so as to output the power supply signal to the power supply control switch according to the switch signal or stop outputting the power supply signal.

9. Pressure protection circuit according to claim 4, characterized in that the drive module comprises a smart power module and/or an IGBT module, each provided with a transistor component,

the first control chip is further configured to: configuring a pulse width modulation signal as the driving control signal, wherein the pulse width modulation signal is used for controlling the transistor component to be switched on and off.

10. A pressure protection control method is applied to a pressure protection circuit of a compressor, the pressure protection circuit comprises a pressure switch module and a driving module, the pressure switch module is configured to control a power supply circuit of the compressor to be connected with or disconnected from the driving module, and the pressure protection control method comprises the following steps:

detecting that a bus signal of the driving module is matched with the working state of the pressure switch module, and indicating that the pressure switch module is controlled to keep an effective state;

and when the bus signal of the driving module is detected to be not matched with the working state of the pressure switch module, the control failure of the pressure switch module is indicated, and the compressor is controlled to stop running.

11. The pressure protection control method according to claim 10, wherein the compressor includes a pressure vessel, and the detecting that the bus signal of the driving module does not match the operating state of the pressure switch module indicates that the pressure switch module control fails, controls the compressor to stop operating, and specifically includes:

responding to the acquired turn-off signal output by the pressure switch module, and detecting the bus signal;

if the bus signal is detected not to be reduced to the voltage threshold value within the designated time, determining that the working states are not matched so as to control the compressor to stop running,

wherein the shutdown signal is generated when the pressure switch module detects that the pressure signal of the pressure vessel is greater than or equal to a pressure threshold.

12. The pressure protection control method according to claim 10, wherein the detecting that the bus signal of the driving module does not match the operating state of the pressure switch module indicates that the pressure switch module control fails, and the controlling the compressor to stop operating specifically comprises:

responding to a starting signal, and controlling the driving module to output a driving control signal before the pressure switch module operates;

and if the bus signal is detected to be in the increasing state, determining that the working state is not matched, and controlling the compressor to stop running.

13. The pressure protection control method according to claim 10 or 11, wherein the controlling the compressor to stop operating specifically includes:

control stop of output of drive control signal to the drive module, and/or

Controlling to close the driving chip of the driving module,

the driving module comprises an intelligent power module and/or an IGBT module, the intelligent power module and/or the IGBT module are provided with transistor components, pulse width modulation signals are configured to be the driving control signals, and the pulse width modulation signals are used for controlling the on-off of the transistor components.

14. The pressure protection control method according to any one of claims 10 to 12, wherein the pressure switch module includes a relay provided between the drive module and the power supply circuit, the pressure protection control method further comprising:

and if the bus signal is detected not to be matched with the working state, determining that the relay is abnormal and generating abnormal alarm information.

15. A computer-readable storage medium having an operation verification program stored thereon, wherein the operation verification program, when executed by a processor, implements the pressure protection control method according to any one of claims 10 to 14.