CN109239446A - AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel - Google Patents
AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel Download PDFInfo
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- CN109239446A CN109239446A CN201810880091.0A CN201810880091A CN109239446A CN 109239446 A CN109239446 A CN 109239446A CN 201810880091 A CN201810880091 A CN 201810880091A CN 109239446 A CN109239446 A CN 109239446A
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- driving tube
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- signal
- input
- output end
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
- G01R19/1658—AC voltage or recurrent signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention proposes a kind of AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel, which includes: first input end and the second input terminal, ac signal for receiving input；Detect signal output end；Detection module, detection module is connect with first input end, the second input terminal and detection signal output end respectively, whether the peak value for detecting ac signal is greater than setting voltage threshold, if, then output pulse signal is to detecting signal output end, if it is not, then exporting single level signal to detecting signal output end.AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel of the invention, it is simple to the detection of the AC supply voltage of input air-conditioner outdoor unit, and have and realize simple, low in cost advantage.
Description
Technical field
The present invention relates to air conditioner controlling technology field more particularly to a kind of AC overvoltage detection circuits, air conditioner, air-conditioning
Machine and its control panel in device.
Background technique
The power supply of air-conditioner outdoor unit is usually controlled by indoor unit, and when externally input AC supply voltage is excessively high, hold
The damage such as compressor of outdoor unit drive module and blower drive module is easily led to, compressor and blower damage are even resulted in.In order to
These phenomenons are avoided the occurrence of, need to be detected in the AC supply voltage to input indoor unit, when externally input AC power source
When overtension, just stop powering to outdoor unit, display board prompts overvoltage failure, stops operation of air conditioner.
In the related technology, to the AC supply voltage detection of input air-conditioner outdoor unit, usually there are two types of methods.
A kind of method are as follows: by increasing a rectification circuit in machine indoors, the AC supply voltage of input is converted to
Then DC voltage passes through one group of bleeder circuit, voltage after low-voltage, is connected on the AD mouth of chip, passes through chip
AD sampling determine the ac voltage of current input, judge whether that AC overvoltage protection occurs further according to the voltage value.
The method carries out decompression processing after first rectifying again, or is first depressured and is rectified again, and detection method is complicated, in addition, also needing to increase
One rectification circuit, increases cost, realizes that difficulty increases.
Another method are as follows: rectified by voltage-stabiliser tube, then input two-way optocoupler to generate square wave, when voltage-stabiliser tube exists
Do not puncture different with generated square-wave cycle in the case of breakdown (over-voltage) by judging that the period carries out over-voltage inspection (without over-voltage)
It surveys.The method need to calculate the period of generated square wave, increase micro-control unit (Microcontroller
Unit, abbreviation MCU) calculated load, it is complicated to make detection method, while also increasing software programming difficulty, keeps the realization of detection difficult
Degree increases.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, the first purpose of this invention is to propose a kind of AC overvoltage detection circuit, make to input air conditioning chamber
The detection of the AC supply voltage of outer machine is simple, and has and realize simple, low in cost advantage.
Second object of the present invention is to propose a kind of control panel of internal machine of air-conditioner.
Third object of the present invention is to propose a kind of internal machine of air-conditioner.
Fourth object of the present invention is to propose a kind of air conditioner.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of AC overvoltage detection circuit, comprising:
First input end and the second input terminal, ac signal for receiving input；
Detect signal output end；
Detection module, the detection module are believed with the first input end, second input terminal and the detection respectively
The connection of number output end, whether the peak value for detecting the ac signal is greater than setting voltage threshold, if so, the detection
Module output pulse signal is to the detection signal output end, if it is not, then the detection module exports single level signal to institute
State detection signal output end.
The AC overvoltage detection circuit proposed according to embodiments of the present invention, first input end and the second input terminal receive
After the ac signal of input, whether setting voltage threshold is greater than by the peak value that detection module detects ac signal, if so,
Then detection module output pulse signal is to signal output end is detected, if it is not, then detection module exports single level signal to detection
Signal output end.The detection circuit is not necessarily to increase rectification circuit, therefore low in cost, also, only need to be by detection module to friendship
Stream signal is detected, then by the output signal of signal output end be can determine whether input AC supply voltage whether mistake
Height, therefore, the AC overvoltage detection circuit also have detection simple, realize simple advantage.
According to one embodiment of present invention, the detection signal output end and the input/output end port of control unit connect
It connects.
According to one embodiment of present invention, the detection module includes: detection unit, the detection unit respectively with institute
It states first input end to connect with second input terminal, for detecting whether the ac signal is greater than the setting voltage threshold
Value；The base stage of first driving tube, first driving tube is connect with the detection unit, the emitter point of first driving tube
It is not connect with the first DC power supply and the first input end, for detecting the first input end in the detection unit
Voltage be greater than second input terminal voltage, and the actual value of the ac signal be greater than the setting voltage threshold when lead
It is logical；Photoelectrical coupler, the input terminal of the photoelectrical coupler are connect with the collector of first driving tube, the photoelectric coupling
The output end of device is connect with the detection signal output end, is used in first driving tube conducting, the photoelectrical coupler
High level signal is exported to the detection signal output end, in first driving tube cut-off, the photoelectrical coupler output
Low level signal is to the detection signal output end.
According to one embodiment of present invention, the detection unit includes: the first divider resistance, first divider resistance
First end connect with the first input end；Second divider resistance, the first end of second divider resistance and described first
The second end of divider resistance connects；The second of rectifier diode, the anode of the rectifier diode and second divider resistance
End connection, the cathode of the rectifier diode are connect with second input terminal；Zener diode, the sun of the zener diode
Pole is connect with the second end of first divider resistance, and the base stage of the cathode of the zener diode and first driving tube connects
It connects.
According to one embodiment of present invention, the detection unit further include: the first current-limiting resistance, the zener diode
Anode connect by first current-limiting resistance with the second end of first divider resistance.
According to one embodiment of present invention, detection circuit further include: the second driving tube, the collection of second driving tube
Electrode is connect with the cathode of the zener diode, and the emitter of second driving tube and the anode of zener diode connect,
The base stage of second driving tube is connect with the collector of first driving tube.
According to one embodiment of present invention, the detection circuit further include: the second current-limiting resistance, second driving tube
Base stage is connect by second current-limiting resistance with the collector of first driving tube.
According to one embodiment of present invention, detection circuit further include: capacitor, the first end of the capacitor and described steady
The cathode connection of diode is pressed, the second end of the capacitor is connect with the emitter of first driving tube.
According to one embodiment of present invention, the detection circuit further include: third current-limiting resistance, first driving tube
Collector is connect by the third current-limiting resistance with the input terminal of the photoelectrical coupler.
According to one embodiment of present invention, the detection circuit further include: the 4th current-limiting resistance, the photoelectrical coupler
Output end is grounded by the 4th current-limiting resistance.
In order to achieve the above object, second aspect of the present invention embodiment proposes a kind of control panel of internal machine of air-conditioner, comprising: such as
AC overvoltage detection circuit described in first aspect present invention embodiment.
In order to achieve the above object, third aspect present invention embodiment proposes a kind of internal machine of air-conditioner, comprising: such as the present invention the
The control panel of internal machine of air-conditioner described in two aspect embodiments.
In order to achieve the above object, fourth aspect present invention embodiment proposes a kind of air conditioner, comprising: such as third party of the present invention
Internal machine of air-conditioner described in the embodiment of face.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of AC overvoltage detection circuit according to an embodiment of the invention；
Fig. 2 is the circuit diagram of AC overvoltage detection circuit in accordance with another embodiment of the present invention；
Fig. 3 is the circuit diagram of AC overvoltage detection circuit in accordance with another embodiment of the present invention；
Fig. 4 is the structure chart of the control panel of internal machine of air-conditioner according to an embodiment of the invention；
Fig. 5 is the structure chart of internal machine of air-conditioner according to an embodiment of the invention；
Fig. 6 is the structure chart of air conditioner according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
AC overvoltage detection circuit, the air conditioner, internal machine of air-conditioner of the embodiment of the present invention described with reference to the accompanying drawing
And its control panel.
Fig. 1 is the structural schematic diagram of AC overvoltage detection circuit according to an embodiment of the invention.As shown in Figure 1,
The AC overvoltage detection circuit of the embodiment of the present invention includes:
First input end N and the second input terminal L, ac signal for receiving input.
Detect signal output end MCU_IO.
Detection module 11, detection module 11 respectively with first input end N, the second input terminal L and detection signal output end
Whether MCU_IO connection, the peak value for detecting ac signal are greater than setting voltage threshold, if so, detection module 11 exports
Pulse signal to detection signal output end MCU_IO, if it is not, then detection module 11 export single level signal to detection signal it is defeated
Outlet MCU_IO.
In the embodiment of the present invention, first input end N and the second input terminal L, ac signal for receiving input, when
After one input terminal N and the second input terminal L receives the ac signal of input, pass through the exchange telecommunications of 11 pairs of detection module inputs
Number detected, can be preset setting voltage threshold, detection module 11 judge the ac signal detected peak value whether
Illustrate the ac signal of input if the peak value of ac signal is greater than setting voltage threshold greater than setting voltage threshold
Overtension, then 11 output pulse signal of detection module extremely detects signal output end MCU_IO, such as the reality in ac signal
When actual value is equal to or less than setting voltage threshold, detection module 11 exports low level signal to signal output end is detected, and is handing over
When the actual value of galvanic electricity signal is greater than setting voltage threshold, detection module 11 exports high level signal to detecting signal output end,
To realize 11 output pulse signal of detection module to signal output end is detected, if the peak value of ac signal is less than setting electricity
Threshold value is pressed, then illustrates the ac signal of input in normal range of operation, then detection module 11 exports single level signal extremely
Signal output end MCU_IO is detected, by judging whether the output signal of signal output end MCU_IO is that pulse signal can determine whether
Whether the AC supply voltage of input is excessively high.
The AC overvoltage detection circuit proposed according to embodiments of the present invention, first input end and the second input terminal receive
After the ac signal of input, whether setting voltage threshold is greater than by the peak value that detection module detects ac signal, if so,
Then detection module output pulse signal is to signal output end is detected, if it is not, then detection module exports single level signal to detection
Signal output end.The detection circuit is not necessarily to increase rectification circuit, therefore low in cost, also, only need to be by detection module to friendship
Stream signal is detected, then by the output signal of signal output end be can determine whether input AC supply voltage whether mistake
Height, therefore, this method have detection simple, realize simple advantage.
Fig. 2 is the circuit diagram of AC overvoltage detection circuit in accordance with another embodiment of the present invention, as shown in Fig. 2,
On the basis of embodiment illustrated in fig. 1, the input/output end port of signal output end MCU_IO and control unit (such as MCU) are detected
(i.e. the port I/O) connection avoids the port analog input AD for occupying control unit (such as MCU), causes AD port resource tight
?.
Wherein, detection module 11 includes:
Detection unit 12, detection unit 12 are connect with first input end N and the second input terminal L respectively, for detecting exchange
Whether electric signal is greater than setting voltage threshold.
In the embodiment of the present invention, preset setting voltage threshold, the AC signal that detection unit 12 will test with set
Constant voltage threshold value is compared, and judges whether the AC signal detected is greater than setting voltage threshold.
First driving tube Q1, the base stage of the first driving tube Q1 are connect with detection unit 12, the emitter of the first driving tube Q1
It is connect respectively with the first DC power supply and first input end N, for detecting that the voltage of first input end N is big in detection unit 12
In the voltage of the second input terminal L, and the actual value of ac signal is connected greater than when setting voltage threshold.
Photoelectrical coupler IC1, the input terminal of photoelectrical coupler IC1 are connect with the collector of the first driving tube Q1, photoelectricity coupling
The output end of clutch IC1 is connect with detection signal output end MCU_IO, is used in the first driving tube Q1 conducting, photoelectrical coupler
IC1 exports high level signal to detection signal output end MCU_IO, and in the first driving tube Q1 cut-off, photoelectrical coupler IC1 is defeated
Low level signal extremely detection signal output end MCU_IO out.
In the embodiment of the present invention, the emitter of the first driving tube Q1 respectively with the first DC power supply (such as in Fig. 2+
It 24V) is connected with first input end N, can be used for controlling photoelectrical coupler IC1 and connect with the first DC power supply and first input end N
The on-off in circuit.When detection unit 12 detects that the voltage of first input end N is greater than the voltage of the second input terminal L, and alternating current
When the actual value of signal is greater than setting voltage threshold, Q1 conducting, photoelectrical coupler IC1 and the first DC power supply and first input end
N connection；When detection unit 12 detects voltage or ac signal of the voltage less than the second input terminal L of first input end N
Actual value when being less than setting voltage threshold, Q1 shutdown (end), photoelectrical coupler IC1 and the first DC power supply and first are defeated
Enter N is held not to be connected to.I.e. when the peak value of ac signal is greater than setting voltage threshold, only near the peak value of half period
In set period of time, Q1 is connected, in the other times section and another half period of the half period, Q1 shutdown.
In the embodiment of the present invention, photoelectrical coupler IC1 is for outputing signal to signal output end MCU_IO.When Q1 is connected
When, photoelectrical coupler IC1 is connected to the first DC power supply and first input end N, and LED shines in photoelectrical coupler IC1, Jin Erguang
The exportable high level of the emitter of electric coupler IC1 is to signal output end MCU_IO；When Q1 shutdown when, photoelectrical coupler IC1 with
First DC power supply is not connected to first input end N, and LED does not shine in photoelectrical coupler IC1, and then photoelectrical coupler IC1
Emitter persistently exports low level to detection signal output end MCU_IO, is greater than setting in the peak value of ac signal to realize
When voltage threshold, photoelectrical coupler IC1 output pulse signal to detection signal output end MCU_IO.
Wherein, detection unit 12 includes:
First divider resistance R1, the first end of the first divider resistance R1 are connect with first input end N；
Second divider resistance R2, the first end of the second divider resistance R2 are connect with the second end of the first divider resistance R1；
Pair in the embodiment of the present invention, the first divider resistance R1 and the second divider resistance R2 play partial pressure in circuit, i.e.,
Voltage between first input end N and the second input terminal L is divided, so that the voltage position of the second end of the first divider resistance R1
In suitable range.
Rectifier diode D1, the anode of rectifier diode are connect with the second end of the second divider resistance R2, rectifier diode
The cathode of D1 is connect with the second input terminal L；
Zener diode DZ, the anode of zener diode DZ are connect with the second end of the first divider resistance R1, two pole of pressure stabilizing
The cathode of pipe DZ is connect with the base stage of the first driving tube Q1.
In the embodiment of the present invention, zener diode DZ pressure stabilizing value is VZ, between first input end N and the second input terminal L
The peak value for protecting voltage is U.As a kind of feasible embodiment, the relationship of U and VZ can be U=(VZ+0.7V) × (R1+
R2)/R1+0.7V.Wherein, the peak value U of voltage is protected to set voltage threshold, it can be by adjusting the first divider resistance R1 and second
The pressure stabilizing value VZ of the resistance value of divider resistance R2 or zener diode DZ changes.When the voltage of first input end N is greater than second
The voltage of input terminal L, and input AC supply voltage actual value be greater than U when, zener diode DZ can reverse breakdown, thus
So that the base stage of the first driving tube Q1 generates electric current, so that the first driving tube Q1 is connected.When the voltage of first input end N is small
In the voltage of the second input terminal L, or when the actual value of AC supply voltage of input is equal to or less than U, zener diode
DZ will not reverse breakdown, the base stage of the first driving tube Q1 will not generate electric current, the first driving tube Q1 shutdown.
Wherein, detection unit 12 further include:
The anode of first current-limiting resistance R3, zener diode DZ pass through the first current-limiting resistance R3's and the first divider resistance R1
Second end connection.
In the embodiment of the present invention, the size of branch current where the first current-limiting resistance R3 can be used for limiting it, to prevent electric current
It is excessive and burn its concatenated electronic component of institute.
Wherein, the detection circuit further include:
Second driving tube Q2, the collector of the second driving tube Q2 are connect with the cathode of zener diode DZ, the second driving tube
The emitter of Q2 is connect with the anode of zener diode DZ, and the collector of the base stage of the second driving tube Q2 and the first driving tube Q1 connect
It connects.
In the embodiment of the present invention, when the voltage of first input end N is greater than the voltage of the second input terminal L, and the exchange inputted
When the actual value of supply voltage is greater than U, zener diode DZ meeting reverse breakdown, so that the base stage of the first driving tube Q1 generates
Electric current, so that the first driving tube Q1 is connected, so that the emitter junction positively biased of the second driving tube Q2, the second driving tube Q2 is led
It is logical, and then promote the first driving tube Q1 conducting, as long as the voltage of first input end N is greater than the voltage of the second input terminal L, first is driven
At the time of the on state of dynamic pipe Q1 can maintain always first input end N and the second input terminal L voltage to overturn, then it can make defeated
Square-wave pulse width out is greater than 1/4 voltage cycle, guarantees the accurate detection to output pulse signal.
Wherein, detection circuit further include: the base stage of the second current-limiting resistance R4, the second driving tube Q2 passes through the second current limliting electricity
Resistance R4 is connect with the collector of the first driving tube Q1.
In the embodiment of the present invention, the size of branch current where the second current-limiting resistance R4 can be used for limiting it, to prevent electric current
It is excessive and burn its concatenated electronic component of institute.
Wherein, detection circuit further include: the collector of third current-limiting resistance R5, the first driving tube Q1 pass through described
Third current-limiting resistance R5 is connect with the input terminal of the photoelectrical coupler IC1.
In the embodiment of the present invention, the size of branch current where third current-limiting resistance R5 can be used for limiting it, to prevent electric current
It is excessive and burn its concatenated electronic component of institute.
Wherein, detection circuit further include: the output end of the 4th current-limiting resistance R6, the photoelectrical coupler IC1 pass through institute
State the 4th current-limiting resistance R6 ground connection.
In the embodiment of the present invention, the size of branch current where the 4th current-limiting resistance R6 can be used for limiting it, to prevent electric current
It is excessive and burn its concatenated electronic component of institute.
Below to use AC supply voltage for 100V, the frequency of input power is 50Hz, the pressure stabilizing of zener diode DZ
Value VZ is 20V, and the first divider resistance R1 resistance value is 42k Ω, and the second divider resistance R2 resistance value is the detection circuit conduct of 300k Ω
The working principle of AC overvoltage detection circuit shown in Fig. 2 is described in detail in example:
By protecting the relationship of the pressure stabilizing value VZ of the peak value U and zener diode DZ of voltage, protection voltage can be calculated
Peak value U=(20V+0.7V) × (42k Ω+300k Ω)/42k Ω+0.7V ≈ 169V, that is, set voltage threshold as 169V, right
The AC supply voltage virtual value for the input answered is 120V, that is, the AC supply voltage for allowing to input generates 20% fluctuation.Electricity
Source voltage cycle=1s/50Hz=2ms.
When voltage of the voltage of first input end N less than the second input terminal L, or input AC supply voltage reality
When value is equal to or less than U, zener diode DZ will not reverse breakdown, the base stage of the first driving tube Q1 will not generate electric current, the
One driving tube Q1 shutdown.Photoelectrical coupler IC1 is not connected to the first DC power supply and first input end N.In photoelectrical coupler IC1
LED does not shine, and then the emitter of photoelectrical coupler IC1 persistently exports low level to detection signal output end MCU_IO.
When the voltage of first input end N is greater than the voltage of the second input terminal L, and the actual value of the AC supply voltage inputted
When greater than U, zener diode DZ meeting reverse breakdown, so that the base stage of the first driving tube Q1 generates electric current, so that the
One driving tube Q1 conducting, photoelectrical coupler IC1 is connected to the first DC power supply and first input end N, in photoelectrical coupler IC1
LED shines, and then the exportable high level of emitter of photoelectrical coupler IC1 is being handed over to signal output end MCU_IO to realize
When the peak value of galvanic electricity signal is greater than setting voltage threshold, photoelectrical coupler IC1 output pulse signal is to detecting signal output end
MCU_IO.When Q1 conducting, so that the emitter junction positively biased of the second driving tube Q2, the second driving tube Q2 conducting, and then promote
First driving tube Q1 conducting, as long as the voltage of first input end N is greater than the voltage of the second input terminal L, the first driving tube Q1's is led
At the time of logical state can maintain always first input end N and the second input terminal L voltage to overturn, then it can make the square wave arteries and veins of output
Width is rushed greater than 1/4 voltage cycle, that is, is greater than 5ms, guarantees the accurate detection to output pulse signal.
Based on above-mentioned working principle, AC signal need to only be detected by detection module, then pass through judgement letter
Whether the output signal of number output end is pulse signal can determine whether the AC supply voltage of input is excessively high, and input AC
When supply voltage is excessively high, pulse signal duration long enough is greater than 1/4 voltage cycle, guarantees to signal output end
The detection of the pulse signal of MCU_IO output, therefore, detection method detection are easy, and are realized simple.And the detection circuit
Composed structure is simple, therefore its is low in cost.
The AC overvoltage detection circuit proposed according to embodiments of the present invention, first input end and the second input terminal receive
After the ac signal of input, whether setting voltage threshold is greater than by the peak value that detection module detects ac signal, if so,
Then detection module output pulse signal is to signal output end is detected, if it is not, then detection module exports single level signal to detection
Signal output end.AC signal need to only be detected by detection module, then be by the output signal of signal output end
Can determine whether the AC supply voltage of input is excessively high, therefore, this method has detection simple, realizes simple advantage.And
The detection circuit is not necessarily to increase rectification circuit and composed structure is simple, therefore its is low in cost.
Fig. 3 is the circuit diagram of AC overvoltage detection circuit in accordance with another embodiment of the present invention, as shown in figure 3,
On the basis of embodiment illustrated in fig. 2, the detection circuit further include:
The first end of capacitor C1, capacitor C1 are connect with the cathode of zener diode DZ, the second end of capacitor and the first driving
The emitter of pipe Q1 connects.
In the embodiment of the present invention, capacitor C1 is connected in parallel between the emitter and base stage of the first driving tube Q1, can be used for filtering out
Clutter improves the anti-interference of detection circuit.
The detection method phase of other AC supply voltages to input whether excessively high detection method and embodiment illustrated in fig. 2
Together, details are not described herein again.
The AC overvoltage detection circuit proposed according to embodiments of the present invention, first input end and the second input terminal receive
After the ac signal of input, whether setting voltage threshold is greater than by the peak value that detection module detects ac signal, if so,
Then detection module output pulse signal is to signal output end is detected, if it is not, then detection module exports single level signal to detection
Signal output end.AC signal need to only be detected by detection module, then be by the output signal of signal output end
Can determine whether the AC supply voltage of input is excessively high, therefore, this method has detection simple, realizes simple advantage.And
The detection circuit is not necessarily to increase rectification circuit and composed structure is simple, therefore its is low in cost.In addition, being used for by increasing capacitor
The anti-interference of detection circuit can be improved in filtering clutter.
In order to realize above-described embodiment, the embodiment of the present invention also proposes a kind of control panel 40 of internal machine of air-conditioner, such as Fig. 4 institute
Show, including the AC overvoltage detection circuit 41 as shown in above-described embodiment.
In order to realize above-described embodiment, the embodiment of the present invention also proposes a kind of internal machine of air-conditioner 42, as shown in figure 5, including
The control panel 40 of the internal machine of air-conditioner as shown in above-described embodiment.
In order to realize above-described embodiment, the embodiment of the present invention also proposes a kind of air conditioner 43, as shown in fig. 6, including as above
State internal machine of air-conditioner 42 shown in embodiment.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
It can be combined in any suitable manner in a or multiple embodiment or examples.In addition, without conflicting with each other, the technology of this field
The feature of different embodiments or examples described in this specification and different embodiments or examples can be combined by personnel
And combination.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (13)
1. a kind of AC overvoltage detection circuit characterized by comprising
First input end and the second input terminal, ac signal for receiving input；
Detect signal output end；
Detection module, the detection module are defeated with the first input end, second input terminal and the detection signal respectively
Outlet connection, whether the peak value for detecting the ac signal is greater than setting voltage threshold, if so, the detection module
Output pulse signal is to the detection signal output end, if it is not, then the detection module exports single level signal to the inspection
Survey signal output end.
2. AC overvoltage detection circuit according to claim 1, which is characterized in that the detection signal output end and control
The input/output end port of unit processed connects.
3. AC overvoltage detection circuit according to claim 1, which is characterized in that the detection module includes:
Detection unit, the detection unit is connect with the first input end and second input terminal respectively, for detecting
State whether ac signal is greater than the setting voltage threshold；
The base stage of first driving tube, first driving tube is connect with the detection unit, the emitter of first driving tube
It is connect respectively with the first DC power supply and the first input end, for detecting the first input end in the detection unit
Voltage be greater than second input terminal voltage, and the actual value of the ac signal be greater than the setting voltage threshold when
Conducting；
Photoelectrical coupler, the input terminal of the photoelectrical coupler are connect with the collector of first driving tube, the photoelectricity coupling
The output end of clutch is connect with the detection signal output end, is used in first driving tube conducting, the photoelectric coupling
Device exports high level signal to the detection signal output end, and in first driving tube cut-off, the photoelectrical coupler is defeated
Low level signal is to the detection signal output end out.
4. AC overvoltage detection circuit according to claim 3, which is characterized in that the detection unit includes:
The first end of first divider resistance, first divider resistance is connect with the first input end；
Second divider resistance, the first end of second divider resistance are connect with the second end of first divider resistance；
Rectifier diode, the anode of the rectifier diode are connect with the second end of second divider resistance, the rectification two
The cathode of pole pipe is connect with second input terminal；
Zener diode, the anode of the zener diode are connect with the second end of first divider resistance, the pressure stabilizing two
The cathode of pole pipe is connect with the base stage of first driving tube.
5. AC overvoltage detection circuit according to claim 4, which is characterized in that the detection unit further include:
The anode of first current-limiting resistance, the zener diode passes through first current-limiting resistance and first divider resistance
Second end connection.
6. AC overvoltage detection circuit according to claim 4, which is characterized in that further include:
The collector of second driving tube, second driving tube is connect with the cathode of the zener diode, second driving
The emitter of pipe and the anode of zener diode connect, the collector of the base stage of second driving tube and first driving tube
Connection.
7. AC overvoltage detection circuit according to claim 4, which is characterized in that further include:
Second current-limiting resistance, the base stage of second driving tube pass through the collection of second current-limiting resistance and first driving tube
Electrode connection.
8. AC overvoltage detection circuit according to claim 4, which is characterized in that further include:
Capacitor, the first end of the capacitor are connect with the cathode of the zener diode, the second end of the capacitor and described the
The emitter of one driving tube connects.
9. AC overvoltage detection circuit according to claim 3, which is characterized in that further include:
The collector of third current-limiting resistance, first driving tube passes through the third current-limiting resistance and the photoelectrical coupler
Input terminal connection.
10. AC overvoltage detection circuit according to claim 3, which is characterized in that further include:
The output end of 4th current-limiting resistance, the photoelectrical coupler is grounded by the 4th current-limiting resistance.
11. a kind of control panel of internal machine of air-conditioner characterized by comprising such as the described in any item exchanges of claim 1-10
Overvoltage detection circuit.
12. a kind of internal machine of air-conditioner characterized by comprising the control panel of internal machine of air-conditioner as claimed in claim 11.
13. a kind of air conditioner characterized by comprising internal machine of air-conditioner as claimed in claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880091.0A CN109239446B (en) | 2018-08-03 | 2018-08-03 | Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880091.0A CN109239446B (en) | 2018-08-03 | 2018-08-03 | Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof |
Publications (2)
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| CN109239446A true CN109239446A (en) | 2019-01-18 |
| CN109239446B CN109239446B (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810880091.0A Active CN109239446B (en) | 2018-08-03 | 2018-08-03 | Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof |
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| CN112032981A (en) * | 2020-07-24 | 2020-12-04 | 广东积微科技有限公司 | Air conditioner indoor and outdoor unit communication circuit and air conditioner |
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| Publication number | Publication date |
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| CN109239446B (en) | 2021-11-19 |
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