CN110469948A - A kind of protection locking and release circuit and air conditioner - Google Patents
A kind of protection locking and release circuit and air conditioner Download PDFInfo
- Publication number
- CN110469948A CN110469948A CN201910874379.1A CN201910874379A CN110469948A CN 110469948 A CN110469948 A CN 110469948A CN 201910874379 A CN201910874379 A CN 201910874379A CN 110469948 A CN110469948 A CN 110469948A
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- 238000001514 detection method Methods 0.000 claims abstract description 34
- 230000002159 abnormal effect Effects 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010615 ring circuit Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
- Amplifiers (AREA)
Abstract
The present invention provides a kind of protection locking and release circuits; it include: detection signal processing sub-circuit; including reverse phase ratio circuit structure; the reverse input end connecting detection signal of the reverse phase scaling circuit; positive input is connected and fixed voltage, output end of the output end of the reverse phase scaling circuit as the detection signal processing sub-circuit；Abnormal protection sub-circuit; including comparator circuit; the reverse input end of the comparator circuit connects the output end of the detection signal processing sub-circuit; positive input connects reference voltage; output end and the positive input access of comparator can conduction devices; it is described can conduction device be connected when output end level is higher than its positive input, the output end of comparator provides judgement signal of the level energizing signal as trigger protection.The circuit structure can improve rapidly base reference signal threshold value after comparator trigger protection, by protection circuit locking, prevent protection circuit frequent movement.
Description
Technical field
The present invention and air-conditioning technical field, in particular to a kind of protection locking and release circuit and air conditioner.
Background technique
Comparator is usually used in some voltages, in current protecting circuit, it is common practice that in one input terminal input of comparator
Base reference signal, another input terminal inputs the voltage/current signals detected, when input voltage/current detection signal
Higher than/low voltage comparator reference signal Vref when, the overturning of comparator output level, synchronous signal processing chip, which detects, to be compared
It is judged as that circuit needs to protect after the overturning of device output level, and output protection action signal.But under some conditions, detection letter
It number may be fluctuated back and forth near reference signal Vref, comparator is caused frequently to be triggered, protection circuit also frequent movement, shadow
Ring circuit reliability and service life.
Summary of the invention
Problems solved by the invention be to provide it is a kind of prevent protection circuit frequent movement protection locking and release circuit and
Air conditioner.
To solve the above problems, the present invention provides a kind of protection locking and release circuit, comprising:
Detect signal processing sub-circuit, including reverse phase ratio circuit structure, the reverse phase scaling circuit it is reversed defeated
Enter to hold connecting detection signal Vs, positive input is connected and fixed voltage, and the output end of the reverse phase scaling circuit is as institute
State the output end vo ut1 of detection signal processing sub-circuit；
The reverse input end of abnormal protection sub-circuit, including comparator circuit, the comparator circuit connects the detection
The positive input of the output end vo ut1 of signal processing sub-circuit, the comparator circuit connect reference voltage Vref, the ratio
Compared with device circuit output end and positive input access can conduction device, it is described can conduction device comparator circuit output end
Level is connected when being higher than its positive input, and the output end vo ut2 of the comparator circuit provides level energizing signal, the electricity
Judgement signal of the flat energizing signal as trigger protection.
Due to comparator circuit output end and positive input access can conduction device, and this can conduction device than
Output end level compared with device circuit is connected when being higher than its positive input, can change comparator electricity when output end level is overturn
The reference voltage Vref of the positive input connection on road so that comparator exports constant high level by locked, and then is realized
Circuit locks defencive function.
Further, in the abnormal protection sub-circuit, it is described can conduction device be PNP triode Q1, the triode
The base earth of Q1, collector connect the positive input of the comparator circuit, and emitter connects the defeated of the comparator circuit
Outlet.
Further, in the abnormal protection sub-circuit, it is described can conduction device be NPN triode Q1, the triode
The base earth of Q1, emitter connect the positive input of the comparator circuit, and collector connects the defeated of the comparator circuit
Outlet.
Further, in the abnormal protection sub-circuit, the positive input of the comparator circuit connects reference voltage
Vref includes: the positive input connection resistance R3 first end of the comparator circuit, the resistance R3 second end ground connection；It is described
The positive input of comparator circuit is also connected with resistance R2 first end, and the resistance R2 second terminates power Vcc.Comparator output
When low level, can conduction device be not turned on, reference voltage Vref 1 be R3 on partial pressure value.
Further, the abnormal protection sub-circuit further include: resistance R1, the resistance R1 first end connect the comparison
The output end vo ut of device circuit, second end connect power supply Vec.When circuit needs to protect, comparator reversion output high level can
Conduction device conducting, resistance R1 and R2 are parallel relationship, and reference threshold Vref is increased, thus comparator locking output high level.
Further, in the abnormal protection sub-circuit, R1 < < R2 and R1 < < R3.As a result, can conduction device lead
When logical, reference threshold Vref is close to Vcc, so as to effectively lock comparator output.
Further, the protection locking and release circuit further include: self-locking and unlocking motion sub-circuit, comprising:
Signal input terminal is connected to the output end vo ut2 of the comparator circuit, according to the output end vo ut2 electricity
Judgement signal of the flat overturning as trigger protection action signal；
It is connected between the output end vo ut2 of signal output terminal, the signal output terminal and the comparator circuit
Second can conduction device, described second can conduction device the comparator circuit output end vo ut2 level be higher than signal it is defeated
It is connected when terminal level out.
The signal of signal input terminal trigger protection signalizing activity when being overturn by low level to high level as a result,；Signal
Output terminal protect release when export low level, drag down comparator output, thus make can conduction device cut-off so that protection electricity
Road unlock, is restored to state before protection.
Further, described self-locking and unlocking motion sub-circuit further include:
Signal processing chip, the I/O port of the signal processing chip is connected to the signal input terminal and the signal is defeated
Terminal out, the signal processing chip, which passes through, judges that the signal level overturning of signal input terminal determines whether that output protection acts
Signal, and at the end of protection, low level reset signal is exported to signal output terminal.
Further, described second can conduction device be diode D1, the diode D1 anode connects the comparator
The cathode of the output end vo ut2, the diode D1 of circuit connect the signal output terminal.
Further, the reverse phase scaling circuit in the detection signal processing sub-circuit includes an operational amplifier,
The first end of the operational amplifier positive input connection resistance R4 and the first end of resistance R5, the second end of the resistance R4
Ground connection, the resistance R5 second end connect power Vcc；The first end of operational amplifier reverse input end connection resistance R6 with
The first end of resistance R7, the second end operational amplifier output terminal of the resistance R6, the resistance R7 second end connecting detection letter
Number Vs.Due to the setting of the reverse phase scaling circuit, the output signal and detection signal of the circuit are in reverse phase proportionate relationship, i.e.,
Detect signal it is bigger, output signal is smaller, as a result, with abnormal protection sub-circuit cooperate, may be implemented protection circuit locking with
Unlock.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the existing protection circuit using comparator；
Fig. 2 is the structural schematic diagram of protection locking and release circuit of the embodiment of the present invention；
Fig. 3 is equivalent circuit of abnormal protection of the embodiment of the present invention sub-circuit before abnormal protection movement；
Fig. 4 is equivalent circuit of abnormal protection of the embodiment of the present invention sub-circuit after abnormal protection movement.
Specific embodiment
Fig. 1 is the structural schematic diagram of the existing protection circuit using comparator.There are drawbacks for existing comparator circuit, work as electricity
Road works in certain exceedingly odious situations, and detection signal Vs amplitude may fluctuate back and forth up and down in Vref value, causes to compare
Device is frequently triggered, and also frequent movement, circuit work in limiting case protection circuit for a long time, and may reduce circuit in this way can
By property and service life.
The present invention proposes that a kind of protection locks and release circuit, the circuit structure can mention rapidly after comparator trigger protection
Protection circuit locking is prevented protection circuit frequent movement by high reference reference signal Vref threshold value.Work as signal processing chip simultaneously
After decision circuitry can work normally, protection circuit can be unlocked by signal chip output reset signal.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Fig. 2 is the structural schematic diagram of protection locking and release circuit of the embodiment of the present invention.As shown in Fig. 2, the present embodiment is protected
Shield locking includes that sequentially connected detection signal processing sub-circuit, abnormal protection sub-circuit and self-locking and unlock are dynamic with release circuit
Make sub-circuit.
Wherein, detection signal processing sub-circuit includes a reverse phase ratio circuit structure, the reverse phase scaling circuit
Reverse input end connecting detection signal Vs, positive input are connected and fixed voltage, the output end of the reverse phase scaling circuit
Output end vo ut1 as the detection signal processing sub-circuit；Due to the setting of the reverse phase scaling circuit, the circuit
Output signal and detection signal be in reverse phase proportionate relationship, i.e., detection signal it is bigger, output signal is smaller, as a result, with abnormal protection
Sub-circuit cooperation, may be implemented the locking and unlock of protection circuit.
As described in Figure 2, in the present embodiment, detection signal processing sub-circuit includes the reverse phase being made of amplifier LM258
Scaling circuit: R5 and R4 partial pressure input amplifier LM258 is held in the same direction, and detection signal Vs inputs amplifier backward end, specifically, institute
State the first end of amplifier LM258 reverse input end connection resistance R6 and the first end of resistance R7, the second end fortune of the resistance R6
Calculate amplifier out, the resistance R7 second end connecting detection signal Vs.Circuit is analyzed it is found that being 0V in detection signal Vs
When, amplifier outputting reference voltage signal；With detection signal Vs amplitude variation, amplifier output Vout1 value is opened from reference voltage value
Begin and Vs changes at reverse phase proportionate relationship.
Specifically, the positive input voltage of amplifier LM258 is fixed electricity in the present embodiment in reverse phase scaling circuit
Press V0=Vcc*R4/ (R4+R5), since Direct/Reverse input terminal void is short, reverse input end voltage is also V0, and due to anti-
Phase input terminal electric current is approximately 0, therefore it is approximately equal with the electric current of R7 to flow through R6, obtains (Vs-V0)/R7=(V0-Vout1)/
R6, i.e. Vout1=V0-R6*(Vs-V0)/R7.By the formula it is found that due to V0For fixed voltage, therefore when detection signal Vs is bigger,
It is smaller to export Vout1；Otherwise when detection signal Vs is smaller, output Vout1 is bigger.
Abnormal protection sub-circuit includes a comparator circuit, since detection signal Vs and output Vout1 is closed at reverse phase ratio
System, thus when Vout1 is less than reference voltage Vref, illustrate that detection signal Vs is larger at this time, which should export
Protection act trigger signal simultaneously realizes locking, otherwise trigger protection does not act when Vout1 is greater than reference voltage Vref.
In order to realize the above functions, the reverse input end of the comparator circuit connects the detection signal processing sub-circuit
Output end vo ut1, positive input connects reference voltage Vref, and the output end and positive input of the comparator circuit connect
Enter can conduction device, it is described can conduction device comparator circuit output end level be higher than its positive input when be connected, institute
The output end vo ut2 for stating comparator circuit provides level energizing signal, judgement of the level energizing signal as trigger protection
Signal.It is described can conduction device include PNP triode or PNP triode.
By comparator circuit output end and positive input access can conduction device, and this can conduction device than
Output end level compared with device circuit is connected when being higher than its positive input, can change comparator electricity when output end level is overturn
The reference voltage Vref of the positive input connection on road so that comparator exports constant high level by locked, and then is realized
Circuit locks defencive function.
Compared to conventional comparator circuit, abnormal protection in the present embodiment is in comparator LM293 output end and reversed defeated
Enter to terminate into a PNP triode Q1；The base earth of the triode Q1, collector connect the forward direction of the comparator circuit
Input terminal, emitter connect the output end of the comparator circuit.Comparator output terminal connects dsp chip signal input and simultaneously
Dsp chip delivery outlet is connected to by diode D1 and realizes protection locking and unlocking function, and the specific working principle is as follows:
Fig. 3 is equivalent circuit of abnormal protection of the embodiment of the present invention sub-circuit before abnormal protection movement.As shown in figure 3,
The positive input of the comparator circuit connects resistance R3 first end, the resistance R3 second end ground connection；The comparator electricity
The positive input on road is also connected with resistance R2 first end, and the resistance R2 second terminates power Vcc.Circuit detects when working normally
Output signal Vout1 voltage is greater than protection threshold value Vref, and comparator exports low level, triode Q1 cut-off.Dsp chip detects
Comparator LM293 output low level signal judgement is that circuit works normally signal, and DSP protection signal does not enable, with reference to electricity
Pressing Vref1 is the partial pressure value on R3, and reference voltage Vref 1 calculates as follows at this time:
The resistance R1 first end connects the output end vo ut of the comparator circuit, and second end connects power Vcc.Fig. 4
For equivalent circuit of abnormal protection of the embodiment of the present invention sub-circuit after abnormal protection movement.As shown in figure 4, when circuit needs to protect
When shield, detection output signal Vout1 voltage is less than protection threshold value Vref, and comparator reversion exports high level, at this time PNP triode
Q1 conducting, reference threshold Vref raising become Vref2, thus comparator locking output high level.Assuming that triode Q1 is in full
And on state, Vref2 calculate as follows:
Assuming that ignoring Q1 conduction voltage drop Vces influence, resistance R1 and R2 are parallel relationship；If R1 < < R2 and R1 < <
R3, then comparator reference voltage Vref2 value is approximately Vcc, and comparator is detected by the locked constant high level of output, dsp chip
Output protection enable signal, realization circuit lock defencive function to comparator high level signal immediately.
It should be noted that can conduction device be not limited to the present embodiment in PNP triode, can also be NPN triode
Q1, the base earth of the NPN triode Q1, emitter connect the positive input of the comparator circuit, and collector meets institute
State the output end of comparator circuit.
Referring again to Fig. 2, self-locking and unlocking motion sub-circuit is connected after abnormal protection sub-circuit.It is self-locking sub with unlocking motion
Circuit includes signal input terminal, signal output terminal and signal processing chip.Wherein signal input terminal is connected to the ratio
Compared with the output end vo ut2 of device circuit, the judgement according to output end vo ut2 level overturning as trigger protection action signal is believed
Number；Be connected between the signal output terminal and the output end vo ut2 of the comparator circuit second can conduction device, it is described
Second can conduction device the comparator circuit output end vo ut2 level be higher than signal output terminal electricity conducts；Institute
The I/O port for stating signal processing chip is connected to the signal input terminal and the signal output terminal, the signal processing chip
Output protection action signal is determined whether by judging that the signal level of signal input terminal is overturn, and at the end of protection, to
Signal output terminal exports low level reset signal.
The signal of signal input terminal trigger protection signalizing activity when being overturn by low level to high level as a result,；Signal
Output terminal protect release when export low level, drag down comparator output, thus make can conduction device cut-off so that protection electricity
Road unlock, is restored to state before protection.
In the present embodiment, described second can conduction device be diode D1, the diode D1 anode connects the comparison
The cathode of the output end vo ut2, the diode D1 of device circuit connect the signal output terminal.When DSP judgement protection terminates
When, dsp chip delivery outlet exports low level reset signal, and comparator output pin is pulled low, triode Q1 cut-off, comparator base
Quasi- voltage becomes Vref1, and protection circuit unlock is restored to state before protection.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (11)
1. a kind of protection locking and release circuit characterized by comprising
Detect signal processing sub-circuit, including reverse phase ratio circuit structure, the reverse input end of the reverse phase scaling circuit
Connecting detection signal Vs, positive input are connected and fixed voltage, and the output end of the reverse phase scaling circuit is as the inspection
Survey the output end vo ut1 of signal processing sub-circuit；
The reverse input end of abnormal protection sub-circuit, including comparator circuit, the comparator circuit connects the detection signal
The output end vo ut1 of sub-circuit is handled, the positive input of the comparator circuit connects reference voltage Vref, the comparator
Circuit output end and positive input access can conduction device, it is described can conduction device comparator circuit output end level
It is connected when higher than its positive input, the output end vo ut2 of the comparator circuit provides level energizing signal, and the level turns over
Judgement signal of the rotaring signal as trigger protection.
2. protection locking according to claim 1 and release circuit, which is characterized in that in the abnormal protection sub-circuit,
It is described can conduction device be PNP triode Q1, the base earth of the triode Q1, collector connects comparator electricity
The positive input on road, emitter connect the output end of the comparator circuit.
3. protection locking according to claim 1 and release circuit, which is characterized in that in the abnormal protection sub-circuit,
It is described can conduction device be NPN triode Q1, the base earth of the triode Q1, emitter connects comparator electricity
The positive input on road, collector connect the output end of the comparator circuit.
4. protection locking according to claim 1 and release circuit, which is characterized in that in the abnormal protection sub-circuit,
The positive input of the comparator circuit connects reference voltage Vref,
The positive input of the comparator circuit connects resistance R3 first end, the resistance R3 second end ground connection；The comparison
The positive input of device circuit is also connected with resistance R2 first end, and the resistance R2 second terminates power Vcc.
5. protection locking according to claim 4 and release circuit, which is characterized in that the abnormal protection sub-circuit also wraps
It includes:
Resistance R1, the resistance R1 first end connect the output end vo ut of the comparator circuit, and second end connects power Vcc.
6. protection locking according to claim 5 and release circuit, which is characterized in that in the abnormal protection sub-circuit,
R1 < < R2 and R1 < < R3.
7. protection locking according to claim 1 and release circuit, which is characterized in that further include:
Self-locking and unlocking motion sub-circuit, comprising:
Signal input terminal is connected to the output end vo ut2 of the comparator circuit, is turned over according to the output end vo ut2 level
Transfer to the judgement signal for trigger protection action signal；
Second is connected between the output end vo ut2 of signal output terminal, the signal output terminal and the comparator circuit
Can conduction device, described second can conduction device the comparator circuit output end vo ut2 level be higher than signal output end
Sub- electricity conducts.
8. protection locking according to claim 7 and release circuit, which is characterized in that described self-locking electric with unlocking motion
Road further include:
Signal processing chip, the I/O port of the signal processing chip are connected to the signal input terminal and the signal output end
Son, the signal processing chip, which passes through, judges that the signal level overturning of signal input terminal determines whether output protection movement letter
Number, and at the end of protection, low level reset signal is exported to signal output terminal.
9. protection according to claim 1 locking and release circuit, which is characterized in that described second can conduction device be two
Pole pipe D1, the diode D1 anode connect the cathode connection of the output end vo ut2, the diode D1 of the comparator circuit
The signal output terminal.
10. protection locking according to claim 1 and release circuit, which is characterized in that the detection signal processing electricity
Reverse phase scaling circuit in road includes an operational amplifier, and the of the operational amplifier positive input connection resistance R4
The first end of one end and resistance R5, the second end ground connection of the resistance R4, the resistance R5 second end connect power Vcc；It is described
Operational amplifier reverse input end connects the first end of resistance R6 and the first end of resistance R7, the second end operation of the resistance R6
Amplifier out, the resistance R7 second end connecting detection signal Vs.
11. a kind of air conditioner, which is characterized in that including the described in any item protection lockings of such as claim 1-10 and unlock electricity
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874379.1A CN110469948B (en) | 2019-09-16 | 2019-09-16 | Protection locking and unlocking circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874379.1A CN110469948B (en) | 2019-09-16 | 2019-09-16 | Protection locking and unlocking circuit and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN110469948A true CN110469948A (en) | 2019-11-19 |
| CN110469948B CN110469948B (en) | 2024-08-13 |
Family
ID=68516002
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910874379.1A Active CN110469948B (en) | 2019-09-16 | 2019-09-16 | Protection locking and unlocking circuit and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113342116A (en) * | 2021-06-30 | 2021-09-03 | 合肥博雷电气有限公司 | Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment |
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| CN113342116A (en) * | 2021-06-30 | 2021-09-03 | 合肥博雷电气有限公司 | Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment |
| CN113342116B (en) * | 2021-06-30 | 2023-08-04 | 合肥博雷电气有限公司 | Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110469948B (en) | 2024-08-13 |
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