CN110671787A - Protection device, air conditioning system and protection method thereof - Google Patents

Protection device, air conditioning system and protection method thereof Download PDF

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Publication number
CN110671787A
CN110671787A CN201910992793.2A CN201910992793A CN110671787A CN 110671787 A CN110671787 A CN 110671787A CN 201910992793 A CN201910992793 A CN 201910992793A CN 110671787 A CN110671787 A CN 110671787A
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China
Prior art keywords
protection
input
unit
power supply
short
Prior art date
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Pending
Application number
CN201910992793.2A
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Chinese (zh)
Inventor
张嘉鑫
苏兆华
张广东
陈良新
宋彦锐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201910992793.2A priority Critical patent/CN110671787A/en
Publication of CN110671787A publication Critical patent/CN110671787A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
    • B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • 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
    • 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
    • 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
    • H02H3/24—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 undervoltage or no-voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention discloses a protection device, an air conditioning system and a protection method thereof, wherein the protection device comprises: the device comprises more than two of an anti-reverse connection unit, a voltage detection unit, a current detection unit, a short-circuit protection unit and a vibration detection unit; the reverse connection preventing unit is used for realizing reverse connection protection of an input power supply; the voltage detection unit is used for realizing undervoltage or overvoltage protection of the input voltage of the input power supply; the current detection unit is used for realizing active short-circuit protection of the input current of the input power supply; the short-circuit protection unit is used for realizing passive short-circuit protection of the input current of the input power supply; and the vibration detection unit is used for realizing automatic power-off protection of the automobile to which the air conditioning system to be protected belongs during driving. The scheme of the invention can solve the problem that the electrically driven air conditioner is easy to cause safety accidents due to lack of protective measures, and achieves the effect of improving the use safety of the electrically driven air conditioner.

Description

Protection device, air conditioning system and protection method thereof
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a protection device, an air conditioning system and a protection method thereof, in particular to a multipurpose protection device, an air conditioning system and a protection method thereof for a vehicle direct-current driven air conditioner.
Background
The working principle of the traditional fuel vehicle-mounted air conditioner is a mechanical transmission type, when an engine runs, a compressor is driven to run synchronously through a mechanical transmission device, so that a refrigerant flows in an internal heat exchanger and an external heat exchanger of a vehicle, and the temperature control of a cab is realized. However, when the vehicle stops, the engine must be in idle operation to drive the compressor to operate, and at this time, the engine has low operation efficiency, high energy consumption and high cost, and long-term idle speed has an influence on the service life of the engine.
At present, more transport vehicles are provided with direct current driven air conditioners, vehicle-mounted storage batteries are adopted for supplying power, the air conditioners can be used for avoiding idling operation of an engine when the vehicles are parked, but the market of the current electric driven air conditioners is not uniform, and some manufacturers lack necessary protection measures for saving cost and are easy to cause safety accidents.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a protection device, an air conditioning system and a protection method thereof to solve the problem that an electrically driven air conditioner is easy to cause safety accidents due to lack of protection measures, and achieve the effect of improving the use safety of the electrically driven air conditioner.
The present invention provides a protection device, comprising: the device comprises more than two of an anti-reverse connection unit, a voltage detection unit, a current detection unit, a short-circuit protection unit and a vibration detection unit; the reverse connection preventing unit is used for realizing reverse connection protection of an input power supply; the voltage detection unit is used for realizing undervoltage or overvoltage protection of the input voltage of the input power supply; the current detection unit is used for realizing active short-circuit protection of the input current of the input power supply; the short-circuit protection unit is used for realizing passive short-circuit protection of the input current of the input power supply; and the vibration detection unit is used for realizing automatic power-off protection of the automobile to which the air conditioning system to be protected belongs during driving.
Optionally, the reverse connection preventing unit is configured to, under the condition that the polarities of the positive electrode and the negative electrode of the input power supply are reversed, disable the output end of the protection device, and implement reverse connection protection of the input power supply; the voltage detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the input voltage of the input power supply is lower than the lower limit of a set voltage range or higher than the upper limit of the set voltage range, so as to realize undervoltage or overvoltage protection of the input voltage; the current detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the input current is higher than or equal to a first set current threshold value, so that active short-circuit protection of the input current is realized; the short-circuit protection unit is used for disconnecting the connection between the input end and the output end of the input power supply under the condition that the input current is higher than or equal to a second set current threshold value within set time, so as to realize the passive short-circuit protection of the input current; wherein the second set current threshold is greater than the first set current threshold; and the vibration detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the actual vibration amplitude of the automobile to which the air conditioning system to be protected belongs is larger than the set vibration amplitude threshold value, so that the protection control of the input power supply of the air conditioning system is realized.
Optionally, the method further comprises: the power supply unit, the main control unit and the switch control unit; the power supply unit, the main control unit and the switch control unit are sequentially connected; the output side of the switch control unit is connected to the power supply input side of the air conditioning system to be protected; the reverse connection preventing unit is connected to the voltage detecting unit, the power supply unit and the short-circuit protection unit from the power output side of the input power supply respectively; the voltage detection unit is also connected to the main control unit; the current detection unit is connected between the short-circuit protection unit and the switch control unit; the current detection unit is also connected to the main control unit; the vibration detection unit is connected to the main control unit.
Optionally, the method further comprises: an external component; the external assembly, comprising: an input positive terminal, an input negative terminal, an output positive terminal, an output negative terminal, and a housing; wherein the housing is disposed at the peripheries of the reverse connection preventing unit, the voltage detecting unit, the current detecting unit, the short circuit protecting unit and the vibration detecting unit, and has a waterproof part and/or a heat radiating part; the input positive terminal, the input negative terminal, the output positive terminal, and the output negative terminal are disposed outside the case; the input positive terminal and the input negative terminal are respectively connected to the input side of the reverse connection preventing unit; the output positive terminal and the output negative terminal are respectively connected to the output side of the switch control unit; the input positive terminal, the input negative terminal, the output positive terminal, any several kinds of terminals in the output negative terminal include: a waterproof terminal.
Optionally, wherein the voltage detecting unit disables the output terminal of the protection device, including: the main control unit controls the switch control unit to cut off the rear-stage output; the current detection unit makes the output end of the protection device not electrified, and comprises: the main control unit controls the switch control unit to cut off the rear-stage output; the short-circuit protection unit disconnects the input end and the output end of the input power supply, and comprises: the fusing device of the short-circuit protection unit is enabled to act, and the connection between the input end and the output end of the input power supply is disconnected; the vibration detection unit makes the output end of the protection device not electrified, and comprises: the main control unit controls the switch control unit to cut off the rear-stage output.
In accordance with another aspect of the present invention, there is provided an air conditioning system including: the protection device described above.
Optionally, the input power supply comprises: a storage battery of an automobile to which the air conditioning system belongs; the air conditioning system includes: electrically driving an air conditioner; the protection device is arranged between the storage battery and the electrically-driven air conditioner or arranged inside the electrically-driven air conditioner.
In another aspect, the present invention provides a method for protecting an air conditioning system, including: two or more of the following protection modes: the reverse connection protection of the input power supply is realized through the reverse connection prevention unit; under-voltage or over-voltage protection of the input voltage of the input power supply is realized through the voltage detection unit; the active short-circuit protection of the input current of the input power supply is realized through the current detection unit; the passive short-circuit protection of the input current of the input power supply is realized through the short-circuit protection unit; and the automatic power-off protection of the automobile to which the air conditioning system to be protected belongs during driving is realized through the vibration detection unit.
Optionally, the reverse connection protection unit is used for not electrifying the output end of the protection device under the condition that the polarities of the anode and the cathode of the input power supply are reversed, so as to realize the reverse connection protection of the input power supply; under the condition that the input voltage of the input power supply is lower than the lower limit of a set voltage range or higher than the upper limit of the set voltage range, the output end of the protection device is not electrified through the voltage detection unit, so that undervoltage or overvoltage protection of the input voltage is realized; the output end of the protection device is not electrified under the condition that the input current is higher than or equal to a first set current threshold value through a current detection unit, so that active short-circuit protection of the input current is realized; under the condition that the input current is higher than or equal to a second set current threshold value within set time, the connection between the input end and the output end of the input power supply is disconnected through the short-circuit protection unit, so that the passive short-circuit protection of the input current is realized; wherein the second set current threshold is greater than the first set current threshold; through the vibration detection unit, under the condition that the actual vibration amplitude of the automobile to which the air conditioning system to be protected belongs is larger than the set vibration amplitude threshold value, the output end of the protection device is not electrified, and the protection control of the input power supply of the air conditioning system is realized.
Optionally, wherein the voltage detection unit disables the output terminal of the protection device, comprising: the main control unit controls the switch control unit to cut off the rear-stage output; the current detection unit makes the output end of the protection device not electrified, and the protection device comprises: the main control unit controls the switch control unit to cut off the rear-stage output; make the disconnection between input and the output of input power supply through short-circuit protection unit, include: the fusing device of the short-circuit protection unit is enabled to act, and the connection between the input end and the output end of the input power supply is disconnected; make this protection device's output not circular telegram through vibration detecting element, include: the main control unit controls the switch control unit to cut off the rear-stage output.
According to the scheme, reverse connection protection, short-circuit protection, under-voltage protection, overvoltage protection and automatic power-off protection of the vehicle are realized through the multipurpose protection device, and the use safety of the vehicle air conditioner is improved.
Furthermore, according to the scheme of the invention, the electrically-driven air conditioner is automatically powered off after the vehicle is started, so that the running electrically-driven air conditioner can be prevented from being damaged in the running process, and the running safety can be prevented from being interfered by electromagnetic noise generated by the running of the air conditioner, and at the moment, a vehicle-mounted air conditioner can be adopted.
Further, according to the scheme of the invention, after the vehicle is started and the electric air conditioner is automatically powered off, the vehicle-mounted air conditioner can be adopted, so that the convenience of use of a user is improved.
Therefore, according to the scheme of the invention, through the multipurpose protection device, reverse connection protection, short circuit protection, under-voltage protection, overvoltage protection and automatic power-off protection of a driving are realized, the problem that an electric drive air conditioner is easy to cause safety accidents due to lack of protection measures is solved, and the effect of improving the use safety of the electric drive air conditioner is achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a protection device according to the present invention;
fig. 2 is a schematic structural diagram of another embodiment of the protection device of the present invention, specifically, a block diagram of an internal module structure;
FIG. 3 is a schematic diagram of an external connection of an embodiment of the protection device of the present invention;
FIG. 4 is a schematic diagram of a built-in connection of an embodiment of the protection device of the present invention;
fig. 5 is an external structural diagram of an embodiment of the protection device of the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
1-inputting a positive waterproof terminal; 2-input negative waterproof terminal; 3-output positive waterproof terminal; 4-output negative waterproof terminal; 5-fixing screw holes; 6-shell structure (adopting partial metal or all metal design, having waterproof and heat dissipation functions).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
According to an embodiment of the present invention, a protection device is provided. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The protection device is arranged between an input power supply and an air conditioning system, and the protection device can comprise: the device comprises more than two of an anti-reverse connection unit, a voltage detection unit, a current detection unit, a short-circuit protection unit and a vibration detection unit.
For example: the protection device has high integration level and perfect protection function, particularly has active and passive protection for short circuit, and can actively remove protection when the fault disappears after active protection. Particularly, the vibration detection unit realizes the monitoring of the starting and stopping states of the vehicle, can realize the processing of the shutdown state of the air conditioner when the vehicle runs, and protects the driving safety and the safety of the whole air conditioner.
For example: one embodiment is shown in fig. 3: connecting the positive power supply pole of the storage battery to the positive input pole of the protection device, and connecting the negative power supply pole of the storage battery to the negative input pole of the protection device; and connecting the output anode of the protection device to the input anode of the electrically-driven air conditioner, and connecting the output cathode of the protection device to the input cathode of the electrically-driven air conditioner.
For example: fig. 4 shows another embodiment of the device according to the invention, in the form of an electrically driven air conditioning interior, which performs the same protective function as described above.
Therefore, the use safety of the electrically driven air conditioner can be improved by carrying out reverse connection protection, undervoltage or overvoltage protection, short-circuit protection, automatic power-off protection of driving and the like on the input voltage of the air conditioning system to be protected through more than two of the reverse connection prevention unit, the voltage detection unit, the current detection unit, the short-circuit protection unit and the vibration detection unit.
In an alternative embodiment, the method may further include: the device comprises a power supply unit, a main control unit and a switch control unit.
The power supply unit, the main control unit and the switch control unit are sequentially connected. And the output side of the switch control unit is connected to the power supply input side of the air conditioning system to be protected. The reverse connection preventing unit is connected to the voltage detecting unit, the power supply unit and the short-circuit protection unit from the power output side of the input power supply respectively. The voltage detection unit is also connected to the main control unit. The current detection unit is connected between the short-circuit protection unit and the switch control unit. The current detection unit is also connected to the main control unit. The vibration detection unit is connected to the main control unit.
For example: as shown in fig. 2, the device is composed of an input terminal, an output terminal, an anti-reverse connection unit, a short-circuit protection unit, a voltage protection unit, a current detection unit, a vibration detection unit, a power supply unit, a main control unit and a switch control unit, and various protection functions of the device are realized through the components.
Therefore, through the matching arrangement of the power supply unit, the main control unit and the switch control unit, more than two protection processes based on the reverse connection prevention unit, the voltage detection unit, the current detection unit, the short-circuit protection unit and the vibration detection unit are more reliable and safer.
In an alternative embodiment, the method may further include: an external component. The external component is arranged on the periphery of the reverse connection preventing unit, the voltage detecting unit, the current detecting unit, the short-circuit protecting unit and the vibration detecting unit and can be used for protecting the reverse connection preventing unit, the voltage detecting unit, the current detecting unit, the short-circuit protecting unit and the vibration detecting unit.
The external component may include: the device comprises an input positive terminal, an input negative terminal, an output positive terminal, an output negative terminal, a mounting part and a shell.
Wherein the housing is disposed at the peripheries of the reverse connection preventing unit, the voltage detecting unit, the current detecting unit, the short circuit protecting unit and the vibration detecting unit, and has a waterproof part and/or a heat radiating part; the installation part is arranged at the bottom of the shell. The input positive terminal, the input negative terminal, the output positive terminal, and the output negative terminal are disposed outside the case. The input positive terminal and the input negative terminal are respectively connected to the input side of the reverse connection preventing unit. The output positive terminal and the output negative terminal are respectively connected to the output side of the switch control unit; the input positive terminal, the input negative terminal, the output positive terminal, any several kinds of terminals in the output negative terminal include: a waterproof terminal.
For example: as shown in fig. 5, an external structure corresponding to the embodiment of fig. 3 specifically includes: the waterproof terminal comprises an input positive waterproof terminal 1, an input negative waterproof terminal 2, an output positive waterproof terminal 3, an output negative waterproof terminal 4, a fixing screw hole 5 and a shell structure 6. Wherein, the shell adopts partial metal or whole metal design, has waterproof radiating function.
Therefore, the protection device is safer and more convenient to use due to the arrangement of the external component.
In an optional example, the reverse connection preventing unit may be configured to implement reverse connection protection of the input power supply, and prevent damage to the air conditioning circuit due to reverse connection of the positive electrode and the negative electrode of the storage battery. The input power supply can be the input power supply of the air conditioning system to be protected.
Optionally, the reverse connection preventing unit may be configured to, under the condition that the polarities of the positive electrode and the negative electrode of the input power supply are reversed, disable the output end of the protection device, implement reverse connection protection of the input power supply, and prevent the air conditioning circuit from being damaged by the reverse connection of the positive electrode and the negative electrode of the storage battery.
For example: the reverse connection preventing unit realizes reverse connection protection of the input power supply, when the polarities of the positive electrode and the negative electrode are reversed, the output of the protection device is not electrified, and the protection device cannot be damaged. When the polarity of the anode and the cathode is correct, the protection device can work normally.
For example: if the polarity of the input of the storage battery is connected in a wrong way, the rear-stage switch control unit of the protection device cannot act, the output terminal of the protection device does not have power output, and the reverse connection protection of the power supply can be realized.
Therefore, reverse connection protection is realized by switching on and off under the condition that the positive electrode and the negative electrode are reversely connected, the protection mode is simple, and the protection result is reliable.
More optionally, the step of the voltage detection unit de-energizing the output terminal of the protection device may include: the main control unit controls the switch control unit to cut off the rear-stage output.
Therefore, reverse connection protection is realized by controlling the switch control unit to cut off the rear-stage output, and the safety is good.
In an optional example, the voltage detection unit may be configured to implement under-voltage or over-voltage protection of an input voltage of the input power supply, so as to prevent the storage battery from being damaged by over-voltage to the air conditioning circuit.
For example: the protection unit (such as a voltage detection unit) realizes the undervoltage and overvoltage detection of input voltage, and when the input voltage is higher or lower than the tolerance voltage of the air conditioner, the control switch control unit cuts off the rear-stage output to protect the safety of the whole air conditioner. When the input voltage is in the normal range, the switch control unit can normally output.
Optionally, the voltage detection unit may be configured to, when the input voltage of the input power supply is lower than a lower limit of the set voltage range or higher than an upper limit of the set voltage range, disable the output terminal of the protection device, implement undervoltage or overvoltage protection of the input voltage, and prevent the storage battery overvoltage from damaging the air-conditioning circuit.
For example: in the operation process of the electric-driven air conditioner, when the voltage of the storage battery is reduced to a low-voltage protection threshold value A, the main control unit controls the switch control unit to cut off an output power supply of the protection device so as to prevent the storage battery from being over-discharged, thereby ensuring that the vehicle can be normally started, realizing undervoltage protection and preventing the storage battery from being insufficient in the use process of the air conditioner to influence the starting of a vehicle engine.
For example: if the storage battery causes voltage rise due to aging, damage and other reasons, when the voltage rises to a high-voltage protection threshold value B, the main control unit controls the switch control unit to cut off an output power supply of the protection device so as to prevent overvoltage damage to an internal circuit of the electrically-driven air conditioner due to overhigh voltage, realize overvoltage protection and prevent the storage battery from being damaged due to overvoltage to the circuit of the air conditioner.
Therefore, under-voltage or over-voltage protection is realized through the comparison condition based on the input voltage and the set voltage range, and the protection mode is simple, convenient and reliable.
In an optional example, the current detection unit may be configured to implement active short-circuit protection of an input current of an input power supply, so as to prevent a short-circuit and an ignition of a storage battery caused by damage of an element during operation of an air conditioner. The input current may be the input current detected by the current detection means, or may be the input current flowing through the current detection means.
For example: the current detection unit realizes active short circuit monitoring, and when the current flowing through the current detection unit is higher than a set protection threshold value, the control switch control unit cuts off the rear-stage output, so that the safety of the whole air conditioner is protected. When the input voltage is in the normal range, the switch control unit can normally output.
Optionally, the current detection unit may be configured to, when the input current is higher than or equal to a first set current threshold, disable the output terminal of the protection device, implement active short-circuit protection of the input current, and prevent a short-circuit and an ignition of the storage battery due to damage of an element during operation of the air conditioner.
For example: when the electric drive air conditioner has internal short circuit caused by element aging, improper use, vibration and the like, and when the current detection unit detects that the current reaches the overcurrent protection threshold value C, the main control unit controls the switch control unit to cut off the output power supply of the protection device, so that the short circuit of the storage battery is prevented.
Therefore, active short-circuit protection is achieved based on the comparison relation between the input current and the first set current threshold, and the active short-circuit protection is simple, convenient and reliable.
More optionally, the current detection unit may disable the output terminal of the protection device, and may include: the main control unit controls the switch control unit to cut off the rear-stage output.
Therefore, the undervoltage or overvoltage protection is realized by controlling the switch control unit to cut off the rear-stage output, and the safety is good.
In an optional example, the short-circuit protection unit can be used for realizing passive short-circuit protection of input current of an input power supply and preventing elements from being damaged to cause short circuit and ignition of a storage battery in the operation of an air conditioner.
Optionally, the short-circuit protection unit may be configured to disconnect the input end and the output end of the input power supply when the input current is higher than or equal to a second set current threshold within a set time, so as to implement passive short-circuit protection of the input current, and prevent a short circuit and an ignition of the storage battery due to damage of an element during operation of the air conditioner.
And the second set current threshold is larger than the first set current threshold. For example: the current value of the passive protection is far larger than that of the active protection.
For example: the short-circuit protection unit realizes passive short-circuit protection, and when abnormal short-circuit current flows through the short-circuit protection circuit in a short time, the fusing device of the short-circuit protection unit acts to disconnect the electrical connection between the input and the output, so that passive protection is realized.
For example: when the short-circuit current reaches the protection threshold value D of the short-circuit protection unit, the short-circuit protection unit is opened, short circuit of the storage battery is prevented, short-circuit protection is achieved, and short circuit and ignition of the storage battery caused by damage of elements in the operation of the air conditioner are prevented.
Therefore, the passive short-circuit protection is realized based on the comparison relation between the input current and the second set current threshold value, so that the passive short-circuit protection is reliable and safe.
More optionally, the short-circuit protection unit disconnects the connection between the input terminal and the output terminal of the input power supply, and may include: the fuse device of the short-circuit protection unit is actuated to disconnect the input terminal and the output terminal of the input power supply.
Therefore, passive protection is achieved by disconnecting the fusing device of the fuse protector, and safety is better.
In an optional example, the vibration detection unit may be configured to implement automatic power-off protection of a vehicle to which an air conditioning system to be protected belongs, that is, to implement prevention of damage to an electrically driven air conditioner in operation during driving, and also to prevent electromagnetic noise generated by operation of the air conditioner from interfering with driving safety.
For example: a multipurpose protection device for a vehicle direct current driven air conditioner can realize power supply reverse connection protection, short circuit protection, under-voltage protection, overvoltage protection and automatic power-off protection of a vehicle; therefore, the starting of a vehicle engine can be prevented from being influenced by the power shortage of the storage battery in the use process of the air conditioner, the damage to an air conditioner circuit caused by the reverse connection of the anode and the cathode of the storage battery can be prevented, the damage to the air conditioner circuit caused by the overvoltage of the storage battery can be prevented, and the short circuit and the ignition of the storage battery caused by the damage of elements in the operation of the air conditioner can be; the electrically-driven air conditioner is automatically powered off after the vehicle is started, the electrically-driven air conditioner in operation can be prevented from being damaged in the driving process, the driving safety is prevented from being interfered by electromagnetic noise generated by the operation of the air conditioner, and the vehicle-mounted air conditioner can be adopted at the moment.
Therefore, the use safety of the electrically driven air conditioner can be improved by performing more than two kinds of protection in reverse connection protection, undervoltage or overvoltage protection, short-circuit protection, automatic power-off protection of driving and the like on the input voltage of the air conditioning system to be protected.
Optionally, the vibration detection unit may be configured to, under a condition that an actual vibration amplitude of an automobile to which the air conditioning system to be protected belongs is greater than a set vibration amplitude threshold, disable an output end of the protection device, and implement protection control on an input power supply of the air conditioning system, that is, implement automatic power-off protection of a vehicle, so as to prevent an electrically-driven air conditioner in operation from being damaged during the vehicle driving process, and prevent electromagnetic noise generated by the operation of the air conditioner from interfering with vehicle driving safety.
For example: the vibration detection unit realizes vehicle start-stop monitoring, and when the actual vibration amplitude is detected to be larger than a protection threshold value, the control switch control unit cuts off the rear-stage output, so that the protection control of the air conditioner power supply is realized.
For example: when the vehicle engine is ignited or the vehicle runs, the vibration detection unit detects that the vibration reaches a protection threshold value E, the main control unit controls the switch control unit to cut off an output power supply of the protection device, so that the electric drive air conditioner power supply is disconnected with the storage battery when the vehicle runs, and the safety of the vehicle runs is ensured; the vehicle-mounted air conditioner can realize automatic power-off protection during driving under the condition that the electric-driven air conditioner is automatically powered off after the vehicle is started, can prevent the electric-driven air conditioner in operation from being damaged during driving, and can also prevent electromagnetic noise generated by the operation of the air conditioner from interfering with driving safety, and at the moment, the vehicle-mounted air conditioner can be adopted.
Therefore, the automatic power-off protection of the driving is realized by the comparison condition between the actual vibration amplitude of the automobile and the set vibration amplitude threshold value, and the method is reliable and safe.
More optionally, the step of de-energizing the output terminal of the protection device by the vibration detection unit may include: the main control unit controls the switch control unit to cut off the rear-stage output.
Therefore, the driving automatic power-off protection is realized by controlling the switch control unit to cut off the rear-stage output, and the safety is good.
Through a large number of tests, the technical scheme of the invention realizes power supply reverse connection protection, short circuit protection, under-voltage protection, overvoltage protection and automatic power-off protection of driving through the multipurpose protection device, and improves the use safety of the vehicle air conditioner.
According to the embodiment of the invention, an air conditioning system corresponding to the protection device is also provided. The air conditioning system may include: the protection device described above.
Optionally, the input power supply may include: the air-conditioning system belongs to the storage battery of the automobile. The air conditioning system may include: an electrically driven air conditioner. The protection device is arranged between the storage battery and the electrically-driven air conditioner or arranged inside the electrically-driven air conditioner.
In an optional embodiment, the invention provides a multipurpose protection device for a vehicle direct current driven air conditioner, which can realize reverse connection protection, short circuit protection, under-voltage protection, overvoltage protection and automatic power-off protection of a vehicle; therefore, the starting of a vehicle engine can be prevented from being influenced by the power shortage of the storage battery in the use process of the air conditioner, the damage to an air conditioner circuit caused by the reverse connection of the anode and the cathode of the storage battery can be prevented, the damage to the air conditioner circuit caused by the overvoltage of the storage battery can be prevented, and the short circuit and the ignition of the storage battery caused by the damage of elements in the operation of the air conditioner can be; the electrically-driven air conditioner is automatically powered off after the vehicle is started, the electrically-driven air conditioner in operation can be prevented from being damaged in the driving process, the driving safety is prevented from being interfered by electromagnetic noise generated by the operation of the air conditioner, and the vehicle-mounted air conditioner can be adopted at the moment.
In an alternative example, in the solution of the present invention, a block diagram of an internal structure of a multipurpose protection device for a vehicle dc-driven air conditioner is shown in fig. 2, and the multipurpose protection device is composed of an input terminal, an output terminal, an anti-reverse connection unit, a short-circuit protection unit, a voltage protection unit, a current detection unit, a vibration detection unit, a power supply unit, a main control unit and a switch control unit, and various protection functions of the device are implemented by these components.
The anti-reverse connection unit, the short-circuit protection unit, the voltage protection unit, the current detection unit, the vibration detection unit, the power supply unit, the main control unit, the switch control unit and the like are mainly composed of a hardware circuit and a sensor. For example: the reverse connection preventing unit can be a diode, a rectifier bridge, an MOS tube or a circuit which is composed of electronic elements and is in one-way conduction; the short-circuit protection unit can be an element or a device with overcurrent fusing characteristics, such as a fuse, a fuse tube, a fuse, an overload protector and the like; the voltage protection unit comprises but is not limited to a voltage detection circuit such as an operational amplifier, a high-precision resistor, a voltage transformer and the like; the current detection unit mainly comprises current sampling elements such as a high-precision resistor, an operational amplifier, a current transformer, a current sensor and the like; the vibration detection unit mainly comprises a vibration sensor, a filter circuit and the like; the power supply unit comprises a DC/DC chip, an MOS (metal oxide semiconductor) tube, an inductor, a diode, a resistor and a capacitor; the main control unit can be one or more of chips such as a singlechip, a DSP, an FPGA and the like; the switch control unit may be composed of a relay, a direct contactor, etc. having a controlled switching electric part.
Compared with a single protection device, the protection device provided by the scheme of the invention has high integration level and perfect protection function, particularly has active and passive protection for short circuit, and can actively remove the protection when the fault disappears after the active protection. Particularly, the vibration detection unit realizes the monitoring of the starting and stopping states of the vehicle, can realize the processing of the shutdown state of the air conditioner when the vehicle runs, and protects the driving safety and the safety of the whole air conditioner.
Optionally, the reverse connection prevention unit realizes reverse connection protection of the input power supply, when the polarities of the positive electrode and the negative electrode are reversed, the output of the protection device is not electrified, and the protection device cannot be damaged. When the polarity of the anode and the cathode is correct, the protection device can work normally.
Optionally, a protection unit (such as a voltage detection unit) realizes undervoltage and overvoltage detection of input voltage, and when the input voltage is higher or lower than the tolerance voltage of the air conditioner, the control switch control unit is controlled to cut off the rear-stage output, so that the safety of the whole air conditioner is protected. When the input voltage is in the normal range, the switch control unit can normally output.
Optionally, the current detection unit realizes active short circuit monitoring, and when the current flowing through the current detection unit is higher than a set protection threshold, the switch control unit is controlled to cut off the rear-stage output, so that the safety of the whole air conditioner is protected. When the input voltage is in the normal range, the switch control unit can normally output.
Optionally, the short-circuit protection unit implements passive short-circuit protection, and when an abnormal short-circuit current flows through the short-circuit protection circuit within a short time, the fuse device of the short-circuit protection unit itself acts to disconnect the electrical connection between the input and the output, thereby implementing passive protection.
The current value of the passive protection is far larger than that of the active protection.
Optionally, the vibration detection unit monitors start and stop of the vehicle, and when the actual vibration amplitude is greater than a protection threshold value, the control switch control unit switches off the rear-stage output to realize protection control of the air conditioner power supply.
In an alternative embodiment, a specific implementation process of the scheme of the present invention can be exemplarily described with reference to the examples shown in fig. 2 to 5.
The multifunctional protection device in the scheme of the invention can be mainly implemented in two modes.
In an alternative embodiment, as shown in fig. 3, one of the embodiments is as follows: connecting the positive power supply pole of the storage battery to the positive input pole of the protection device, and connecting the negative power supply pole of the storage battery to the negative input pole of the protection device; and connecting the output anode of the protection device to the input anode of the electrically-driven air conditioner, and connecting the output cathode of the protection device to the input cathode of the electrically-driven air conditioner.
Optionally, if the polarity of the input of the storage battery is connected in a wrong way, the rear-stage switch control unit of the protection device does not act, the output terminal of the protection device does not have power output, and power reverse connection protection can be achieved.
Optionally, in the operation process of the electrically driven air conditioner, when the voltage of the storage battery is reduced to a low-voltage protection threshold value a, the main control unit controls the switch control unit to cut off an output power supply of the protection device so as to prevent the storage battery from being over-discharged, thereby ensuring that the vehicle can be normally started, realizing under-voltage protection and preventing the storage battery from being insufficient in the use process of the air conditioner to influence the starting of a vehicle engine.
Optionally, if the voltage of the storage battery rises due to aging, damage and the like, when the voltage rises to the high-voltage protection threshold B, the main control unit controls the switch control unit to cut off the output power supply of the protection device so as to prevent overvoltage damage to the internal circuit of the electrically-driven air conditioner due to overhigh voltage, so that overvoltage protection can be realized, and damage to the circuit of the air conditioner due to overvoltage of the storage battery is prevented.
Optionally, when the electrically-driven air conditioner is internally short-circuited due to component aging, improper use, vibration and the like, and when the current detection unit detects that the current reaches the overcurrent protection threshold C, the main control unit controls the switch control unit to cut off the output power supply of the protection device to prevent the storage battery from being short-circuited; when the short-circuit current reaches the protection threshold value D of the short-circuit protection unit, the short-circuit protection unit is opened, short circuit of the storage battery is prevented, short-circuit protection is achieved, and short circuit and ignition of the storage battery caused by damage of elements in the operation of the air conditioner are prevented.
The protection threshold value C is smaller than the protection threshold value D, and the protection device has double protection for short circuit.
Optionally, when the vehicle engine is ignited or the vehicle runs, and the vibration detection unit detects that the vibration magnitude reaches the protection threshold value E, the main control unit controls the switch control unit to cut off the output power supply of the protection device, so that the electric drive air conditioner power supply is disconnected from the storage battery during running, and the running safety is ensured; the vehicle-mounted air conditioner can realize automatic power-off protection during driving under the condition that the electric-driven air conditioner is automatically powered off after the vehicle is started, can prevent the electric-driven air conditioner in operation from being damaged during driving, and can also prevent electromagnetic noise generated by the operation of the air conditioner from interfering with driving safety, and at the moment, the vehicle-mounted air conditioner can be adopted.
Fig. 5 is an external structure corresponding to the embodiment of fig. 3, and specifically includes: the waterproof terminal comprises an input positive waterproof terminal 1, an input negative waterproof terminal 2, an output positive waterproof terminal 3, an output negative waterproof terminal 4, a fixing screw hole 5 and a shell structure 6. Wherein, the shell adopts partial metal or whole metal design, has waterproof radiating function.
In an alternative embodiment, fig. 4 shows another embodiment of the device of the present invention, in which the protection device is in the form of an electrically driven air conditioning interior component, and performs the same protection function as described above.
Since the processing and functions of the air conditioning system of this embodiment are basically corresponding to the embodiment, principle and example of the apparatus shown in fig. 2, the description of this embodiment is not given in detail, and reference may be made to the related description in the foregoing embodiment, which is not repeated herein.
Through a large number of tests, the technical scheme of the invention can prevent the running electrically-driven air conditioner from being damaged in the running process and prevent electromagnetic noise generated by the running of the air conditioner from interfering with the running safety by automatically powering off the electrically-driven air conditioner after the vehicle is started, and at the moment, a vehicle-mounted air conditioner can be adopted.
According to the embodiment of the invention, a protection method of the air conditioning system corresponding to the air conditioning system is also provided. The protection method of the air conditioning system may include two or more of the following protection modes.
The first protection mode: through the reverse connection preventing unit, reverse connection protection of the input power supply is achieved, and damage to the air conditioner circuit caused by reverse connection of the positive electrode and the negative electrode of the storage battery is prevented. The input power supply can be the input power supply of the air conditioning system to be protected.
Optionally, the reverse connection prevention unit is used for preventing the output end of the protection device from being electrified under the condition that the polarities of the anode and the cathode of the input power supply are reversed, so that reverse connection protection of the input power supply is realized, and the condition that the air conditioning circuit is damaged due to reverse connection of the anode and the cathode of the storage battery is prevented.
For example: the reverse connection preventing unit realizes reverse connection protection of the input power supply, when the polarities of the positive electrode and the negative electrode are reversed, the output of the protection device is not electrified, and the protection device cannot be damaged. When the polarity of the anode and the cathode is correct, the protection device can work normally.
For example: if the polarity of the input of the storage battery is connected in a wrong way, the rear-stage switch control unit of the protection device cannot act, the output terminal of the protection device does not have power output, and the reverse connection protection of the power supply can be realized.
Therefore, reverse connection protection is realized by switching on and off under the condition that the positive electrode and the negative electrode are reversely connected, the protection mode is simple, and the protection result is reliable.
More optionally, the step of de-energizing the output terminal of the protection device by the voltage detection unit may include: the main control unit controls the switch control unit to cut off the rear-stage output.
Therefore, reverse connection protection is realized by controlling the switch control unit to cut off the rear-stage output, and the safety is good.
The second protection mode: through the voltage detection unit, the undervoltage or overvoltage protection of the input voltage of the input power supply is realized, and the damage to an air-conditioning circuit caused by the overvoltage of the storage battery is prevented.
For example: the protection unit (such as a voltage detection unit) realizes the undervoltage and overvoltage detection of input voltage, and when the input voltage is higher or lower than the tolerance voltage of the air conditioner, the control switch control unit cuts off the rear-stage output to protect the safety of the whole air conditioner. When the input voltage is in the normal range, the switch control unit can normally output.
Optionally, the voltage detection unit is used for keeping the output end of the protection device from being electrified under the condition that the input voltage of the input power supply is lower than the lower limit of the set voltage range or higher than the upper limit of the set voltage range, so that undervoltage or overvoltage protection of the input voltage is realized, and the storage battery overvoltage is prevented from damaging the air-conditioning circuit.
For example: in the operation process of the electric-driven air conditioner, when the voltage of the storage battery is reduced to a low-voltage protection threshold value A, the main control unit controls the switch control unit to cut off an output power supply of the protection device so as to prevent the storage battery from being over-discharged, thereby ensuring that the vehicle can be normally started, realizing undervoltage protection and preventing the storage battery from being insufficient in the use process of the air conditioner to influence the starting of a vehicle engine.
For example: if the storage battery causes voltage rise due to aging, damage and other reasons, when the voltage rises to a high-voltage protection threshold value B, the main control unit controls the switch control unit to cut off an output power supply of the protection device so as to prevent overvoltage damage to an internal circuit of the electrically-driven air conditioner due to overhigh voltage, realize overvoltage protection and prevent the storage battery from being damaged due to overvoltage to the circuit of the air conditioner.
Therefore, under-voltage or over-voltage protection is realized through the comparison condition based on the input voltage and the set voltage range, and the protection mode is simple, convenient and reliable.
The third protection mode: through the current detection unit, the active short-circuit protection of the input current of the input power supply is realized, and the short circuit and the ignition of the storage battery caused by the damage of elements in the operation of the air conditioner are prevented. The input current may be the input current detected by the current detection means, or may be the input current flowing through the current detection means.
For example: the current detection unit realizes active short circuit monitoring, and when the current flowing through the current detection unit is higher than a set protection threshold value, the control switch control unit cuts off the rear-stage output, so that the safety of the whole air conditioner is protected. When the input voltage is in the normal range, the switch control unit can normally output.
Optionally, the current detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the input current is higher than or equal to the first set current threshold value, so that active short-circuit protection of the input current is realized, and the condition that elements are damaged during the operation of the air conditioner to cause short circuit and ignition of the storage battery is prevented.
For example: when the electric drive air conditioner has internal short circuit caused by element aging, improper use, vibration and the like, and when the current detection unit detects that the current reaches the overcurrent protection threshold value C, the main control unit controls the switch control unit to cut off the output power supply of the protection device, so that the short circuit of the storage battery is prevented.
Therefore, active short-circuit protection is achieved based on the comparison relation between the input current and the first set current threshold, and the active short-circuit protection is simple, convenient and reliable.
More optionally, the step of de-energizing the output terminal of the protection device through the current detection unit may include: the main control unit controls the switch control unit to cut off the rear-stage output.
Therefore, the undervoltage or overvoltage protection is realized by controlling the switch control unit to cut off the rear-stage output, and the safety is good.
The fourth protection mode: the passive short-circuit protection of the input current of the input power supply is realized through the short-circuit protection unit, and the short-circuit and the ignition of the storage battery caused by the damage of elements in the operation of the air conditioner are prevented.
Optionally, the short-circuit protection unit disconnects the input end and the output end of the input power supply when the input current is higher than or equal to a second set current threshold within a set time, so as to realize passive short-circuit protection of the input current and prevent the storage battery from being short-circuited and ignited due to component damage during the operation of the air conditioner. And the second set current threshold is larger than the first set current threshold.
For example: the current value of the passive protection is far larger than that of the active protection.
For example: the short-circuit protection unit realizes passive short-circuit protection, and when abnormal short-circuit current flows through the short-circuit protection circuit in a short time, the fusing device of the short-circuit protection unit acts to disconnect the electrical connection between the input and the output, so that passive protection is realized.
For example: when the short-circuit current reaches the protection threshold value D of the short-circuit protection unit, the short-circuit protection unit is opened, short circuit of the storage battery is prevented, short-circuit protection is achieved, and short circuit and ignition of the storage battery caused by damage of elements in the operation of the air conditioner are prevented.
Therefore, the passive short-circuit protection is realized based on the comparison relation between the input current and the second set current threshold value, so that the passive short-circuit protection is reliable and safe.
More optionally, the disconnecting the input end and the output end of the input power supply by the short-circuit protection unit may include: the fuse device of the short-circuit protection unit is actuated to disconnect the input terminal and the output terminal of the input power supply.
Therefore, passive protection is achieved by disconnecting the fusing device of the fuse protector, and safety is better.
The fifth protection mode: the vibration detection unit realizes the automatic power-off protection of the automobile to which the air conditioning system to be protected belongs, namely, the damage to the running electrically-driven air conditioner in the driving process is prevented, and the electromagnetic noise generated by the running of the air conditioner is prevented from interfering the driving safety.
For example: a multipurpose protection device for a vehicle direct current driven air conditioner can realize power supply reverse connection protection, short circuit protection, under-voltage protection, overvoltage protection and automatic power-off protection of a vehicle; therefore, the starting of a vehicle engine can be prevented from being influenced by the power shortage of the storage battery in the use process of the air conditioner, the damage to an air conditioner circuit caused by the reverse connection of the anode and the cathode of the storage battery can be prevented, the damage to the air conditioner circuit caused by the overvoltage of the storage battery can be prevented, and the short circuit and the ignition of the storage battery caused by the damage of elements in the operation of the air conditioner can be; the electrically-driven air conditioner is automatically powered off after the vehicle is started, the electrically-driven air conditioner in operation can be prevented from being damaged in the driving process, the driving safety is prevented from being interfered by electromagnetic noise generated by the operation of the air conditioner, and the vehicle-mounted air conditioner can be adopted at the moment.
Therefore, the use safety of the electrically driven air conditioner can be improved by performing more than two kinds of protection in reverse connection protection, undervoltage or overvoltage protection, short-circuit protection, automatic power-off protection of driving and the like on the input voltage of the air conditioning system to be protected.
Optionally, by the vibration detection unit, under the condition that the actual vibration amplitude of the automobile to which the air conditioning system to be protected belongs is greater than the set vibration amplitude threshold, the output end of the protection device is not electrified, so that protection control over the input power supply of the air conditioning system is realized, namely automatic power-off protection of driving is realized, damage to the electrically driven air conditioner in operation in the driving process is prevented, and electromagnetic noise generated by the operation of the air conditioner is prevented from interfering with driving safety.
For example: the vibration detection unit realizes vehicle start-stop monitoring, and when the actual vibration amplitude is detected to be larger than a protection threshold value, the control switch control unit cuts off the rear-stage output, so that the protection control of the air conditioner power supply is realized.
For example: when the vehicle engine is ignited or the vehicle runs, the vibration detection unit detects that the vibration reaches a protection threshold value E, the main control unit controls the switch control unit to cut off an output power supply of the protection device, so that the electric drive air conditioner power supply is disconnected with the storage battery when the vehicle runs, and the safety of the vehicle runs is ensured; the vehicle-mounted air conditioner can realize automatic power-off protection during driving under the condition that the electric-driven air conditioner is automatically powered off after the vehicle is started, can prevent the electric-driven air conditioner in operation from being damaged during driving, and can also prevent electromagnetic noise generated by the operation of the air conditioner from interfering with driving safety, and at the moment, the vehicle-mounted air conditioner can be adopted.
Therefore, the automatic power-off protection of the driving is realized by the comparison condition between the actual vibration amplitude of the automobile and the set vibration amplitude threshold value, and the method is reliable and safe.
More optionally, the step of de-energizing the output terminal of the protection device by the vibration detection unit may include: the main control unit controls the switch control unit to cut off the rear-stage output.
Therefore, the driving automatic power-off protection is realized by controlling the switch control unit to cut off the rear-stage output, and the safety is good.
Since the processing and functions implemented by the method of the present embodiment substantially correspond to the embodiments, principles and examples of the air conditioning system shown in fig. 2 to 5, the description of the present embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
Through a large amount of experimental verifications, adopt the technical scheme of this embodiment, through the vehicle after the electric drive air conditioner auto-power-off after starting, can adopt on-vehicle air conditioner, promote the convenience that the user used.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A protective device, comprising: the device comprises more than two of an anti-reverse connection unit, a voltage detection unit, a current detection unit, a short-circuit protection unit and a vibration detection unit; wherein,
the reverse connection preventing unit is used for realizing reverse connection protection of the input power supply;
the voltage detection unit is used for realizing undervoltage or overvoltage protection of the input voltage of the input power supply;
the current detection unit is used for realizing active short-circuit protection of the input current of the input power supply;
the short-circuit protection unit is used for realizing passive short-circuit protection of the input current of the input power supply;
and the vibration detection unit is used for realizing automatic power-off protection of the automobile to which the air conditioning system to be protected belongs during driving.
2. The apparatus of claim 1, wherein,
the reverse connection preventing unit is used for enabling the output end of the protection device not to be electrified under the condition that the polarities of the anode and the cathode of the input power supply are reversed, so that reverse connection protection of the input power supply is realized;
the voltage detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the input voltage of the input power supply is lower than the lower limit of a set voltage range or higher than the upper limit of the set voltage range, so as to realize undervoltage or overvoltage protection of the input voltage;
the current detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the input current is higher than or equal to a first set current threshold value, so that active short-circuit protection of the input current is realized;
the short-circuit protection unit is used for disconnecting the connection between the input end and the output end of the input power supply under the condition that the input current is higher than or equal to a second set current threshold value within set time, so as to realize the passive short-circuit protection of the input current; wherein the second set current threshold is greater than the first set current threshold;
and the vibration detection unit is used for enabling the output end of the protection device not to be electrified under the condition that the actual vibration amplitude of the automobile to which the air conditioning system to be protected belongs is larger than the set vibration amplitude threshold value, so that the protection control of the input power supply of the air conditioning system is realized.
3. The apparatus of claim 1 or 2, further comprising: the power supply unit, the main control unit and the switch control unit; wherein,
the power supply unit, the main control unit and the switch control unit are sequentially connected; the output side of the switch control unit is connected to the power supply input side of the air conditioning system to be protected;
the reverse connection preventing unit is connected to the voltage detecting unit, the power supply unit and the short-circuit protection unit from the power output side of the input power supply respectively; the voltage detection unit is also connected to the main control unit;
the current detection unit is connected between the short-circuit protection unit and the switch control unit; the current detection unit is also connected to the main control unit;
the vibration detection unit is connected to the main control unit.
4. The apparatus of claim 3, further comprising: an external component;
the external assembly, comprising: an input positive terminal, an input negative terminal, an output positive terminal, an output negative terminal, and a housing; wherein,
the shell is arranged at the periphery of the reverse connection preventing unit, the voltage detecting unit, the current detecting unit, the short circuit protecting unit and the vibration detecting unit and is provided with a waterproof part and/or a heat radiating part;
the input positive terminal, the input negative terminal, the output positive terminal, and the output negative terminal are disposed outside the case; the input positive terminal and the input negative terminal are respectively connected to the input side of the reverse connection preventing unit; the output positive terminal and the output negative terminal are respectively connected to the output side of the switch control unit; the input positive terminal, the input negative terminal, the output positive terminal, any several kinds of terminals in the output negative terminal include: a waterproof terminal.
5. The apparatus of claim 3, wherein,
the voltage detection unit makes the output end of the protection device not electrified, and comprises: the main control unit controls the switch control unit to cut off the rear-stage output;
the current detection unit makes the output end of the protection device not electrified, and comprises: the main control unit controls the switch control unit to cut off the rear-stage output;
the short-circuit protection unit disconnects the input end and the output end of the input power supply, and comprises: the fusing device of the short-circuit protection unit is enabled to act, and the connection between the input end and the output end of the input power supply is disconnected;
the vibration detection unit makes the output end of the protection device not electrified, and comprises: the main control unit controls the switch control unit to cut off the rear-stage output.
6. An air conditioning system, comprising: a protective device as claimed in any one of claims 1 to 5.
7. The air conditioning system of claim 6, wherein the input power source comprises: a storage battery of an automobile to which the air conditioning system belongs; the air conditioning system includes: electrically driving an air conditioner;
wherein,
the protection device is arranged between the storage battery and the electrically-driven air conditioner or arranged inside the electrically-driven air conditioner.
8. A method for protecting an air conditioning system according to claim 6 or 7, characterized by comprising two or more of the following protection modes:
the reverse connection protection of the input power supply is realized through the reverse connection prevention unit;
under-voltage or over-voltage protection of the input voltage of the input power supply is realized through the voltage detection unit;
the active short-circuit protection of the input current of the input power supply is realized through the current detection unit;
the passive short-circuit protection of the input current of the input power supply is realized through the short-circuit protection unit;
and the automatic power-off protection of the automobile to which the air conditioning system to be protected belongs during driving is realized through the vibration detection unit.
9. The method of claim 8, wherein,
through the reverse connection preventing unit, under the condition that the polarities of the anode and the cathode of the input power supply are reverse, the output end of the protection device is not electrified, and reverse connection protection of the input power supply is realized;
under the condition that the input voltage of the input power supply is lower than the lower limit of a set voltage range or higher than the upper limit of the set voltage range, the output end of the protection device is not electrified through the voltage detection unit, so that undervoltage or overvoltage protection of the input voltage is realized;
the output end of the protection device is not electrified under the condition that the input current is higher than or equal to a first set current threshold value through a current detection unit, so that active short-circuit protection of the input current is realized;
under the condition that the input current is higher than or equal to a second set current threshold value within set time, the connection between the input end and the output end of the input power supply is disconnected through the short-circuit protection unit, so that the passive short-circuit protection of the input current is realized; wherein the second set current threshold is greater than the first set current threshold;
through the vibration detection unit, under the condition that the actual vibration amplitude of the automobile to which the air conditioning system to be protected belongs is larger than the set vibration amplitude threshold value, the output end of the protection device is not electrified, and the protection control of the input power supply of the air conditioning system is realized.
10. The method of claim 9, wherein,
the voltage detection unit is used for making the output end of the protection device not electrified, and the protection device comprises: the main control unit controls the switch control unit to cut off the rear-stage output;
the current detection unit makes the output end of the protection device not electrified, and the protection device comprises: the main control unit controls the switch control unit to cut off the rear-stage output;
make the disconnection between input and the output of input power supply through short-circuit protection unit, include: the fusing device of the short-circuit protection unit is enabled to act, and the connection between the input end and the output end of the input power supply is disconnected;
make this protection device's output not circular telegram through vibration detecting element, include: the main control unit controls the switch control unit to cut off the rear-stage output.
CN201910992793.2A 2019-10-18 2019-10-18 Protection device, air conditioning system and protection method thereof Pending CN110671787A (en)

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