CN107681626A - The protection circuit and its control method of air-conditioner controller - Google Patents
The protection circuit and its control method of air-conditioner controller Download PDFInfo
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- CN107681626A CN107681626A CN201710823369.6A CN201710823369A CN107681626A CN 107681626 A CN107681626 A CN 107681626A CN 201710823369 A CN201710823369 A CN 201710823369A CN 107681626 A CN107681626 A CN 107681626A
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- Prior art keywords
- protection circuit
- air
- relay
- voltage
- conditioner controller
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/085—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current making use of a thermal sensor, e.g. thermistor, heated by the excess current
-
- 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
- H02H3/207—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 also responsive to under-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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a kind of protection circuit of air-conditioner controller and its control method.Wherein, a kind of protection circuit of air-conditioner controller, including：Thermistor, relay, rectification module, voltage sample module and MCU；Wherein, the zero line of the first input end connection civil power of rectification module, its second input connect the zero line side of civil power, and its output head anode is connected to MCU by voltage sample module；Thermistor is connected between the first input end of rectification module and the zero line of civil power；Relay is connected in the both ends of thermistor in parallel；MCU is used for the DC bus-bar voltage for detecting the output head anode of rectification module, and according to the break-make of DC bus-bar voltage control relay.By the protection circuit of the present invention, when finding that power supply is over-pressed or under-voltage, relay is disconnected in time; using the characteristic of thermistor heating internal resistance increase, prevent curtage from being mutated, reach the purpose of protection successive load; improve the service life of air conditioner, improve automatically controlled reliability.
Description
Technical field
The present invention relates to air conditioner technical field, in particular to a kind of protection circuit of air-conditioner controller, Yi Zhongkong
Adjust the control method of the protection circuit of controller.
Background technology
When there is transient voltage in power supply, due to the load of now air conditioner is constant, the power output short time keep it is constant,
Loop current abrupt transients increase, frequently can lead to air conditioner excessively stream and the load damaged inside it or circuit board；Work as power supply
When there is instantaneous overvoltage, if now frequently can lead to the overvoltage of air conditioner more than the pressure voltage of component and damage inside it
Load or circuit board.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art or correlation technique.
Therefore, it is an aspect of the invention to propose a kind of protection circuit of air-conditioner controller.
Another aspect of the present invention is to propose a kind of control method of the protection circuit of air-conditioner controller.
In view of this, the present invention proposes a kind of protection circuit of air-conditioner controller, including：It is thermistor, relay, whole
Flow module, voltage sample module and MCU；Wherein, the zero line of the first input end connection civil power of rectification module, its second input
The zero line side of end connection civil power, its output head anode are connected to MCU by voltage sample module；Thermistor is connected on rectification mould
Between the first input end of block and the zero line of civil power；Relay is connected in the both ends of thermistor in parallel；MCU is whole for detecting
The DC bus-bar voltage of the output head anode of flow module, and according to the break-make of DC bus-bar voltage control relay.
According to the protection circuit of the air-conditioner controller of the present invention, when MCU detects dc bus by voltage sample module
(it is less than threshold voltage) during low voltage, control disconnects relay, and now high current increases its internal resistance of generating heat by thermistor
Greatly, current break or cutoff circuit are limited, protects successive load and the excessively stream of electric-controlled plate safety；When MCU passes through voltage sample
(it is higher than threshold voltage) when module detects that DC bus-bar voltage is too high, control disconnects relay, and now electric current is by temperature-sensitive electricity
Resistance makes its internal resistance increase of generating heat, forms partial pressure effect, limits voltage jump and feeds back to MCU in time and turns off load output and stop
PFC boost control output, protect the automatically controlled component of rear class life-span, reduce overpressure conditions, so as to extend air conditioner use the longevity
Order, improve automatically controlled reliability.Also, due to the protection circuit of air-conditioner controller provided by the invention, thermistor is set
Protective effect is can act as before rectification module, therefore for the load corresponding to alternating current-direct current, will relative to traditional circuit
It is arranged on after rectification module, has more preferable protecting effect.
In addition, according to the protection circuit of the above-mentioned air-conditioner controller of the present invention, there can also be technology additional as follows special
Sign：
In the above-mentioned technical solutions, it is preferable that voltage sample module includes：First resistor, second resistance；Wherein, first
The first end of resistance is connected to the output head anode of rectification module, and the second end is grounded after being connected with second resistance；And first electricity
Second end of resistance is connected to MCU as the output end of voltage sample module.
In the technical scheme, the method for employing divider resistance during direct current bus voltage detecting circuit is designed, without
Using traditional voltage sensor, have it is simple in construction, be easy to the characteristics of debugging, it is often more important that significantly reduce hardware into
This.Specifically, it is changed into DC voltage after the rectified module of electric main, MCU passes through voltage sampling circuit first resistor and
Two electric resistance partial pressures detect DC bus-bar voltage.
In any of the above-described technical scheme, it is preferable that the protection circuit also includes：Filter capacitor, filter capacitor are connected in parallel on
MCU both ends.
In the technical scheme, one end connection MCU of filter capacitor, other end ground connection, for filtering interference signals, so that
MCU sampled values are more accurate, and improve MCU conversion speeds.It is abnormal in DC bus-bar voltage for whole protection circuit
When (such as over-pressed or under-voltage), relay can be disconnected in time, increase thermistor internal resistance, limit voltage or current break, from
And the life-span of the automatically controlled component of rear class is protected, and then realize and extend the service life of air conditioner, improve automatically controlled reliability.
In any of the above-described technical scheme, it is preferable that the protection circuit also includes：Clamp diode, the clamp diode
First end connection external power supply, the second end ground connection, three-terminal link is between first resistor and second resistance.
In the technical scheme, clamp diode is composed in parallel by two diode reverses, positive terminal connection external power supply,
Preferably 5V DC voltages, negative pole end ground connection, the 3rd end is that the public access point of two diodes in parallel is connected to first resistor
Between second resistance, so as to limit MCU access voltage, its operating voltage is maintained at 5V, prevent from burning under overpressure conditions
MCU。
In any of the above-described technical scheme, it is preferable that the protection circuit also includes：EMI filter circuit, it is connected to exchange city
Between electricity and rectification module.
In the technical scheme, in whole protection circuit, after electric main first passes around EMI filter circuit, process is whole
Supply load operation is flowed, its effect is to avoid disturbing incoming successive load, interference load normal work, it is possible to increase air conditioner
Stability and dependability.
In any of the above-described technical scheme, it is preferable that rectification module is bridge rectifier.
In the technical scheme, rectification module is bridge rectifier, and electric main is converted into direct current by bridge rectifier
Pressure.
The invention also provides a kind of control method of the protection circuit of air-conditioner controller, in such as above-mentioned technical scheme
The protection circuit of the air-conditioner controller of any one, the control method include：Detect DC bus-bar voltage；By DC bus-bar voltage with
Predetermined voltage threshold is compared, and according to the break-make of comparative result control relay.
According to the control method of the protection circuit of the air-conditioner controller of the present invention, when MCU is detected by voltage sample module
To DC bus-bar voltage it is relatively low when (be less than threshold voltage), control disconnects relay, and now high current makes it by thermistor
Generate heat internal resistance increase, limitation current break or cutoff circuit, protects successive load and the excessively stream of electric-controlled plate safety；When MCU leads to
(it is higher than threshold voltage) when overvoltage sampling module detects that DC bus-bar voltage is too high, control disconnects relay, now electric current
Make its internal resistance increase of generating heat by thermistor, form partial pressure effect, limit voltage jump and feed back to MCU in time and turn off load
Output and stopping PFC boost control output, protect the life-span of the automatically controlled component of rear class, reduce overpressure conditions, so as to extend air-conditioning
The service life of device, improve automatically controlled reliability.Also, due to the protection circuit of air-conditioner controller provided by the invention, by heat
Quick resistance is arranged on before rectification module, therefore can act as protective effect for the load corresponding to alternating current-direct current, relative to
Traditional circuit is disposed at after rectification module, has more preferable protecting effect.
In the above-mentioned technical solutions, it is preferable that by DC bus-bar voltage compared with predetermined voltage threshold, and according to than
Compared with output control relay break-make the step of, specifically include：When DC bus-bar voltage is more than the first predetermined voltage threshold, control
Relay processed disconnects；Or when DC bus-bar voltage is less than the second predetermined voltage threshold, control relay disconnects；Wherein, first
Predetermined voltage threshold is more than the second predetermined voltage threshold.
In the technical scheme, the first predetermined voltage threshold is overvoltage threshold, and the second predetermined voltage threshold is brownout threshold.
When occurring over-pressed, under-voltage, the load inside air conditioner or circuit board is often caused to break down or even damage.When MCU passes through
When voltage sample module detects that DC bus-bar voltage is less than the second predeterminated voltage threshold values, illustrate that undervoltage condition occurs in power supply, this
When control disconnect relay, high current makes its internal resistance increase of generating heat by thermistor, limits current break or cutoff circuit,
Protect successive load and the excessively stream of electric-controlled plate safety；When MCU detects DC bus-bar voltage higher than the by voltage sample module
One predeterminated voltage threshold values, illustrate that overpressure situation occurs in power supply, now control disconnects relay, and electric current makes its hair by thermistor
Hot internal resistance increase, partial pressure effect is formed, limit voltage jump and feed back to MCU in time and turn off load output and stop PFC boost
Control output, protect the life-span of the automatically controlled component of rear class, reduce overpressure conditions, so as to extend the service life of air conditioner, improve
Automatically controlled reliability.
In any of the above-described technical scheme, it is preferable that after control relay disconnection, according to default return difference time control
Relay closes.
In the technical scheme, after over-pressed, under-voltage control relay, which occurs, in power supply to be disconnected, by setting the return difference time to control
Relay processed closure, such as interval 3 minutes, 3 minutes attracting electric relays again after relay disconnects.
In any of the above-described technical scheme, it is preferable that according to DC bus-bar voltage and the difference of predetermined voltage threshold, set
The default return difference time.
In the technical scheme, it is not a regular time to preset the return difference time, can be according to supply voltage exception journey
Degree is set accordingly.Preferably, set according to the DC bus-bar voltage and the difference of predetermined voltage threshold detected.Example
Such as, for difference when within 10v, it is 3 minutes to set recovery time threshold value, and difference sets recovery time when 10v is between 20v
Threshold value is 5 minutes.At the same time, the different return difference time can also be preset according to the grid condition of different regions.
In any of the above-described technical scheme, it is preferable that in preset time, the number of meter relay disconnection, Yi Jigen
According to the frequent degree of number, the default return difference time is set.
In the technical scheme, it is not a regular time to preset the return difference time, the frequency that can be disconnected according to relay
Numerous degree is configured.Specifically, in a preset time, the triggering times of meter relay, the frequency of number of pass times
Numerous degree sets the return difference time, and at the same time it can also consider the grid condition of different regions, the standard of triggering times is set
Put.
In any of the above-described technical scheme, it is preferable that when number reaches preset times threshold value, issue the user with prompting letter
Cease and show protection code.
In the technical scheme, in preset time, when the triggering times of relay exceed preset times, output protection
Code informs that user pays close attention to grid condition, so as to so that abnormity of power supply situation is maintained in time, protect air conditioner well
System, it is unlikely to damage.
The additional aspect and advantage of the present invention will become obvious in following description section, or the practice by the present invention
Recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 shows the schematic diagram of the protection circuit of air-conditioner controller according to an embodiment of the invention；
Fig. 2 shows the flow of the control method of the protection circuit of air-conditioner controller according to an embodiment of the invention
Schematic diagram；
Fig. 3 shows the stream of the control method of the protection circuit of air-conditioner controller according to another embodiment of the invention
Journey schematic diagram；
Fig. 4 shows the stream of the control method of the protection circuit of air-conditioner controller according to still a further embodiment
Journey schematic diagram；
Fig. 5 shows the control method of the protection circuit of the air-conditioner controller of a specific embodiment according to the present invention
Schematic flow sheet.
Wherein, the corresponding relation in Fig. 1 between reference and component names is：
102 thermistors, 104 relays, 106 rectification modules, 108 first resistors, 110 second resistances, 112 filtered electricals
Hold, 114 clamp diodes, 116EMI filter circuits.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be different from other modes described here using other to implement, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The protection circuit of air-conditioner controller according to an embodiment of the invention is described referring to Fig. 1.
As shown in figure 1, according to one embodiment of present invention, it is proposed that a kind of protection circuit of air-conditioner controller, including：
Thermistor 102, relay 104, bridge rectifier 106, voltage sample module and MCU；Wherein, the of bridge rectifier 106
One input connects the zero line of civil power, and its second input connects the zero line side of civil power, and its output head anode is adopted by voltage
Egf block is connected to MCU；Thermistor 102 is connected between the first input end of bridge rectifier 106 and the zero line of civil power；
Relay 104 is connected in the both ends of thermistor 102 in parallel；MCU is used for the straight of the output head anode for detecting bridge rectifier 106
Busbar voltage is flowed, and according to the break-make of DC bus-bar voltage control relay 104.
The protection circuit of air-conditioner controller provided by the invention, when MCU detects dc bus by voltage sample module
(it is less than threshold voltage) during low voltage, control disconnects relay 104, and now high current makes its heating by thermistor 102
Internal resistance increases, and limits current break or cutoff circuit, protects successive load and the excessively stream of electric-controlled plate safety；When MCU passes through electricity
Pressure sampling module (is higher than threshold voltage) when detecting that DC bus-bar voltage is too high, and control disconnects relay 104, and now electric current passes through
Cross thermistor 102 make its generate heat internal resistance increase, formed partial pressure effect, limit voltage jump and feed back in time MCU turn off it is negative
Carry output and stop PFC boost control output, protect the life-span of the automatically controlled component of rear class, reduce overpressure conditions, so as to extend sky
Adjust the service life of device, improve automatically controlled reliability.Also, will due to the protection circuit of air-conditioner controller provided by the invention
Thermistor 102 is arranged on before bridge rectifier 106, therefore be can act as protection for the load corresponding to alternating current-direct current and made
With after being disposed at bridge rectifier 106 relative to traditional circuit, there is more preferable protecting effect.
In one embodiment of the invention, it is preferable that voltage sample module includes：First resistor 108, second resistance
110；Wherein, the first end of first resistor is connected to the output head anode of bridge rectifier 106, the second end and second resistance 110
It is grounded after series connection；And the second end of first resistor 108 is connected to MCU as the output end of voltage sample module.
In this embodiment, the method for employing divider resistance when designing direct current bus voltage detecting circuit, without adopting
With traditional voltage sensor, have it is simple in construction, be easy to the characteristics of debugging, it is often more important that significantly reduce hardware into
This.Specifically, electric main is changed into DC voltage after bridge rectifier 106, and MCU passes through voltage sampling circuit first resistor
108 and the partial pressure of second resistance 110 detect DC bus-bar voltage.
In one embodiment of the invention, it is preferable that the protection circuit also includes：Filter capacitor 112, filter capacitor is simultaneously
It is associated in MCU both ends.
In this embodiment, one end connection MCU of filter capacitor 112, other end ground connection, for filtering interference signals, with
Make MCU sampled values more accurate, and improve MCU conversion speeds.It is different in DC bus-bar voltage for whole protection circuit
When often (such as over-pressed or under-voltage), relay 104 can be disconnected in time, increases the internal resistance of thermistor 102, limit voltage or electric current
Mutation, so as to protect the life-span of the automatically controlled component of rear class, and then realize extend the service life of air conditioner, improve it is automatically controlled reliable
Property.
In one embodiment of the invention, it is preferable that the protection circuit also includes：Clamp diode 114, the clamper two
The first end connection external power supply of pole pipe, the second end ground connection, three-terminal link is between first resistor and second resistance.
In this embodiment, clamp diode 114 is composed in parallel by two diode reverses, and positive terminal connects external electricity
Source, it is therefore preferable to which 5V DC voltages, negative pole end ground connection, the 3rd end are that the public access point of two diodes in parallel is connected to the first electricity
Between resistance 108 and second resistance 110, so as to limit MCU access voltage, its operating voltage is maintained at 5V, prevented pressure ring
MCU is burnt under border.
In one embodiment of the invention, it is preferable that the protection circuit also includes：EMI filter circuit 116, is connected to
Between electric main and bridge rectifier 106.
In this embodiment, in whole protection circuit, after electric main first passes around EMI filter circuit 116, then pass through
Rectification supply load is run, and its effect is to avoid disturbing incoming successive load, interference load normal work, it is possible to increase air conditioner
Stability and dependability.
As shown in Fig. 2 the stream of the control method of the protection circuit of air-conditioner controller according to an embodiment of the invention
Journey schematic diagram.Wherein, control method, for the protection circuit of the air-conditioner controller in such as above-mentioned embodiment, the control method
Including：
Step 202, DC bus-bar voltage is detected；
Step 204, by DC bus-bar voltage compared with predetermined voltage threshold, and according to comparative result control relay
Break-make.
The control method of the protection circuit of air-conditioner controller provided by the invention, when MCU is detected by voltage sample module
To DC bus-bar voltage it is relatively low when (be less than threshold voltage), control disconnects relay, and now high current makes it by thermistor
Generate heat internal resistance increase, limitation current break or cutoff circuit, protects successive load and the excessively stream of electric-controlled plate safety；When MCU leads to
(it is higher than threshold voltage) when overvoltage sampling module detects that DC bus-bar voltage is too high, control disconnects relay, now electric current
Make its internal resistance increase of generating heat by thermistor, form partial pressure effect, limit voltage jump and feed back to MCU in time and turn off load
Output and stopping PFC boost control output, protect the life-span of the automatically controlled component of rear class, reduce overpressure conditions, so as to extend air-conditioning
The service life of device, improve automatically controlled reliability.Also, due to the protection circuit of air-conditioner controller provided by the invention, by heat
Quick resistance is arranged on before rectification module, therefore can act as protective effect for the load corresponding to alternating current-direct current, relative to
Traditional circuit is disposed at after rectification module, has more preferable protecting effect.
As shown in figure 3, the control method of the protection circuit of air-conditioner controller according to another embodiment of the invention
Schematic flow sheet.Wherein, control method, for the protection circuit of the air-conditioner controller in such as above-mentioned embodiment, the controlling party
Method includes：
Step 302, DC bus-bar voltage is detected；
Step 304, by DC bus-bar voltage compared with predetermined voltage threshold；
Step 306, when DC bus-bar voltage is more than the first predetermined voltage threshold, control relay disconnects；
Step 308, when DC bus-bar voltage is less than the second predetermined voltage threshold, control relay disconnects；
Wherein, the first predetermined voltage threshold is more than the second predetermined voltage threshold.
In this embodiment, the first predetermined voltage threshold is overvoltage threshold, and the second predetermined voltage threshold is brownout threshold.Go out
When existing over-pressed, under-voltage, the load inside air conditioner or circuit board is often caused to break down or even damage.When MCU passes through electricity
When pressure sampling module detects that DC bus-bar voltage is less than the second predeterminated voltage threshold values, illustrate that undervoltage condition occurs in power supply, now
Control disconnects relay, and high current makes its internal resistance increase of generating heat by thermistor, limits current break or cutoff circuit, protect
Protect successive load and the excessively stream safety of electric-controlled plate；When MCU detects that DC bus-bar voltage is higher than first by voltage sample module
Predeterminated voltage threshold values, illustrate that overpressure situation occurs in power supply, now control disconnects relay, and electric current makes its heating by thermistor
Internal resistance increase, partial pressure effect is formed, limit voltage jump and feed back to MCU in time and turn off load output and stop PFC boost control
System output, protect the life-span of the automatically controlled component of rear class, reduce overpressure conditions, so as to extend the service life of air conditioner, improve electricity
The reliability of control.
As shown in figure 4, the control method of the protection circuit of air-conditioner controller according to still a further embodiment
Schematic flow sheet.Wherein, control method, for the protection circuit of the air-conditioner controller in such as above-mentioned embodiment, the controlling party
Method includes：
Step 402, DC bus-bar voltage is detected；
Step 404, by DC bus-bar voltage compared with predetermined voltage threshold；
Step 406, when DC bus-bar voltage is more than the first predetermined voltage threshold, control relay disconnects；
Step 408, when DC bus-bar voltage is less than the second predetermined voltage threshold, control relay disconnects；
Step 410, after control relay disconnection, closed according to default return difference control timer；
Wherein, the first predetermined voltage threshold is more than the second predetermined voltage threshold.
In this embodiment, after over-pressed, under-voltage control relay, which occurs, in power supply to be disconnected, by setting return difference time control
Relay closes, such as interval 3 minutes, 3 minutes attracting electric relays again after relay disconnects.
In another example of the present invention, set the under-voltage and over-pressed disconnection relay of DC bus-bar voltage and adhesive after
The threshold value of electrical equipment, while recovery time threshold value is set.For example, relay is closed when DC bus-bar voltage is less than 130v, when straight
Stream busbar voltage disconnects relay when being higher than 150v, is spaced 2 minutes.
In any of the above-described embodiment, it is preferable that according to DC bus-bar voltage and the difference of predetermined voltage threshold, set pre-
If the return difference time.
In this embodiment, it is not a regular time to preset the return difference time, can be according to supply voltage intensity of anomaly
Set accordingly.Preferably, set according to the DC bus-bar voltage and the difference of predetermined voltage threshold detected.Example
Such as, for difference when within 10v, it is 3 minutes to set recovery time threshold value, and difference sets recovery time when 10v is between 20v
Threshold value is 5 minutes.At the same time, the different return difference time can also be preset according to the grid condition of different regions.
In any of the above-described embodiment, it is preferable that in preset time, the number of meter relay disconnection, and according to
The frequent degree of number, the default return difference time is set.
In this embodiment, it is not a regular time to preset the return difference time, can be disconnected according to relay frequent
Degree is configured.Specifically, in a preset time, the triggering times of meter relay, number of pass times it is frequent
Degree sets the return difference time, and at the same time it can also consider the grid condition of different regions, the standard of triggering times is configured.
In any of the above-described embodiment, it is preferable that when number reaches preset times threshold value, issue the user with prompting message
And show protection code.
In this embodiment, in preset time, when the triggering times of relay exceed preset times, output protection generation
Code informs that user pays close attention to grid condition, so as to so that abnormity of power supply situation is maintained in time, protect air conditioner system well
System, is unlikely to damage.
As shown in figure 5, the control method according to the protection circuit of the air-conditioner controller of the specific embodiment of the present invention
Schematic flow sheet.Wherein, control method, for the protection circuit of the air-conditioner controller in such as above-mentioned embodiment, the control
Method includes：
Step 502, DC bus-bar voltage is detected；
Step 504, by DC bus-bar voltage compared with predetermined voltage threshold；
Step 506, when DC bus-bar voltage is more than 150v, control relay disconnects；
Step 508, when DC bus-bar voltage is less than 90v, control relay disconnects；
Step 510, after relay disconnects 3 minutes, control relay closure；
Step 512, the triggering times of meter relay, judge whether relay was more than 5 times in 15 minutes internal trigger numbers；
Step 514, when judged result is to be, issue the user with prompting message and show protection code；
When judged result is no, return to step 502.
In this embodiment, in preset time, herein preferably exemplified by 15 minutes, when the triggering times of relay surpass
When crossing preset times, herein preferably exemplified by 5 times, output protection code inform user pay close attention to grid condition, so as to so that
Abnormity of power supply situation is maintained in time, protects air-conditioner system well, is unlikely to damage.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (12)
- A kind of 1. protection circuit of air-conditioner controller, it is characterised in that including：Thermistor, relay, rectification module, voltage Sampling module and MCU；Wherein,The zero line of the first input end connection civil power of the rectification module, its second input connect the zero line side of civil power, its Output head anode is connected to the MCU by the voltage sample module；The thermistor is connected between the first input end of the rectification module and the zero line of civil power；The relay is connected in the both ends of the thermistor in parallel；The MCU is used for the DC bus-bar voltage for detecting the output head anode of the rectification module, and according to the dc bus Voltage controls the break-make of the relay.
- 2. the protection circuit of air-conditioner controller according to claim 1, it is characterised in that the voltage sample module bag Include：First resistor, second resistance；Wherein,The first end of the first resistor is connected to the output head anode of the rectification module, the second end and the second resistance string It is grounded after connection；AndSecond end of the first resistor is connected to the MCU as the output end of the voltage sample module.
- 3. the protection circuit of air-conditioner controller according to claim 1, it is characterised in that also include：Filter capacitor, the filter capacitor are connected in parallel on the both ends of the MCU.
- 4. the protection circuit of air-conditioner controller according to claim 1, it is characterised in that also include：Clamp diode, the first end connection external power supply of the clamp diode, the second end ground connection, three-terminal link is described Between first resistor and the second resistance.
- 5. the protection circuit of air-conditioner controller according to any one of claim 1 to 4, it is characterised in that also include：EMI filter circuit, it is connected between the electric main and the rectification module.
- 6. the protection circuit of air-conditioner controller according to any one of claim 1 to 4, it is characterised in thatThe rectification module is bridge rectifier.
- 7. a kind of control method of the protection circuit of air-conditioner controller, it is characterised in that for any in such as claim 1 to 6 The protection circuit of air-conditioner controller described in, the control method include：Detect DC bus-bar voltage；By the DC bus-bar voltage compared with predetermined voltage threshold, and the logical of the relay is controlled according to comparative result It is disconnected.
- 8. the control method of the protection circuit of air-conditioner controller according to claim 7, it is characterised in that described by described in DC bus-bar voltage is compared with predetermined voltage threshold, and the step of control the break-make of the relay according to comparative result, Specifically include：When the DC bus-bar voltage is more than the first predetermined voltage threshold, the relay is controlled to disconnect；OrWhen the DC bus-bar voltage is less than the second predetermined voltage threshold, the relay is controlled to disconnect；Wherein, first predetermined voltage threshold is more than second predetermined voltage threshold.
- 9. the protection circuit of air-conditioner controller according to claim 8, it is characterised in thatAfter controlling the relay to disconnect, closed according to relay described in default return difference time control.
- 10. the control method of the protection circuit of the air-conditioner controller according to any one of claim 7 to 9, its feature exists In,According to the DC bus-bar voltage and the difference of the predetermined voltage threshold, the default return difference time is set.
- 11. the control method of the protection circuit of the air-conditioner controller according to any one of claim 7 to 9, its feature exists In,In preset time, the number that the relay disconnects, and the frequent degree according to the number are recorded, is set default The return difference time.
- 12. the control method of the protection circuit of air-conditioner controller according to claim 11, it is characterised in thatWhen the number reaches preset times threshold value, issue the user with prompting message and show protection code.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710823369.6A CN107681626A (en) | 2017-09-13 | 2017-09-13 | The protection circuit and its control method of air-conditioner controller |
| PCT/CN2018/092605 WO2019052256A1 (en) | 2017-09-13 | 2018-06-25 | Protection circuit of air conditioning controller and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710823369.6A CN107681626A (en) | 2017-09-13 | 2017-09-13 | The protection circuit and its control method of air-conditioner controller |
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| Publication Number | Publication Date |
|---|---|
| CN107681626A true CN107681626A (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710823369.6A Pending CN107681626A (en) | 2017-09-13 | 2017-09-13 | The protection circuit and its control method of air-conditioner controller |
Country Status (2)
| Country | Link |
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| CN (1) | CN107681626A (en) |
| WO (1) | WO2019052256A1 (en) |
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