CN108953207A - A kind of blower reversal protection control device - Google Patents
A kind of blower reversal protection control device Download PDFInfo
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- CN108953207A CN108953207A CN201810842924.4A CN201810842924A CN108953207A CN 108953207 A CN108953207 A CN 108953207A CN 201810842924 A CN201810842924 A CN 201810842924A CN 108953207 A CN108953207 A CN 108953207A
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- phase sequence
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- trigger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
Abstract
The invention discloses a kind of blower reversal protection control devices.The device includes: partial pressure shaping circuit, circuit of testing the phase sequence and phase sequence adjustment circuit；The output end of partial pressure shaping circuit is connected with the input terminal of circuit of testing the phase sequence, and the three-phase voltage partial pressure for will test is shaped to three-phase square wave pulse signal, and sends three-phase square wave pulse signal to circuit of testing the phase sequence；Circuit of testing the phase sequence carries out Phase sequence detection to three-phase square wave pulse signal, judges whether the timing of three-phase square wave pulse signal is correct, if incorrect, the control signal of output abnormality phase sequence, and send control signal to phase sequence adjustment circuit；Phase sequence adjustment circuit includes solid-state relay, and phase sequence adjustment circuit receives the control signal of the abnormal phase sequence of circuit of testing the phase sequence output, and is adjusted using solid-state relay to abnormal phase sequence.The invention is able to achieve the automatic switchover of power phase, improves efficiency.
Description
Technical field
The present invention relates to air-blower control technical field, especially a kind of blower reversal protection control device.
Background technique
Modern architecture has the characteristics that structure is complicated, internal flammable ornament materials is more, pipe shaft is more and density of personnel is big,
Once fire occurs, interior architecture finishing material, furniture, clothing and other combustible materials etc. generate largely in combustion
Poison gas and heat, flue gas and heat can be spread rapidly along corridor, fire escape, staircase and air shaft, be formed strong
Stack effect, cause biggish casualties and property loss.
Mainly there are mechanical smoke prevention and mechanical smoke extraction two ways for the control of fire smoke at present.Smoke control system is by wind
It machine, pipeline, valve, air outlet, smoke outlet and blower, valve and send, the composition such as the linkage of exhaust outlet.Mechanical smoke prevention is
It needs the position of Smoke prevention to be sent into enough fresh airs in fire escape etc., it is made to be maintained above the pressure at other positions of building
Power, so that flue gas caused by fire area is intercepted except Smoke prevention position；Mechanical smoke extraction is aspirated by mechanical smoke extraction machine
The fume exhausting type that generated high-temperature flue gas forces discharge outdoor by components such as smoke discharging pipe, smoke outlets in fire area.It builds
It builds blower used in smoke control system and is generally three-phase alternating-current motor, with reliable for operation, sturdy and durable, maintenance side
Just the features such as.Three-phase alternating current is widely used in daily production and living, and production, conveying and the distribution almost all of electric energy use
Three-phase alternating current.
Currently, anti-reverse measure is not taken in the control of fire-fighting blower generally in China's fire-fighting system industry.?
When Switching power, transformer installation, motor wiring, maintenance, three-phase power supply phase sequence may be made to change, at this moment usually
Control loop can be directly cut off by phase sequence relay, then exchanges any two power supply lines manually, restarted, so that three-phase
Ac motor rotates forward；Or power phase is detected using phase-sequence indicator, identifier, after detection phase sequence is errorless, then access three
Phase ac motor power initiation three-phase alternating-current motor.Above two mode is both needed under power blackout situation, manually adjusts power supply
Phase sequence, can not auto switching electric source phase sequence, adjustment during need power off and manual operation, efficiency it is lower.
Summary of the invention
The object of the present invention is to provide a kind of blower reversal protection control devices, are able to achieve cutting automatically for power phase
It changes, improves efficiency.
To achieve the above object, the present invention provides following schemes:
A kind of blower reversal protection control device, comprising: partial pressure shaping circuit, circuit of testing the phase sequence and phase sequence adjustment electricity
Road；
The output end of the partial pressure shaping circuit is connected with the input terminal of the circuit of testing the phase sequence, for what be will test
Three-phase voltage partial pressure is shaped to three-phase square wave pulse signal, and sends the three-phase square wave pulse signal to the Phase sequence detection
Circuit；The circuit of testing the phase sequence is used to carry out Phase sequence detection to the three-phase square wave pulse signal, judges the three-phase square wave
Whether the timing of pulse signal correct, if incorrect, the control signal of output abnormality phase sequence, and will control signal send to it is described
Phase sequence adjustment circuit；
The phase sequence adjustment circuit includes solid-state relay, and it is defeated that the phase sequence adjustment circuit receives the circuit of testing the phase sequence
The control signal of abnormal phase sequence out, and abnormal phase sequence is adjusted using solid-state relay.
Optionally, the circuit of testing the phase sequence, including the first current-limiting resistance, the second current-limiting resistance, third current-limiting resistance,
One voltage-stabiliser tube, the second voltage-stabiliser tube, third voltage-stabiliser tube, the first double D trigger, the second double D trigger, the first filter capacitor, second
Filter capacitor, first diode, the second diode, the first transistor, second transistor and DC relay；
First current-limiting resistance, second current-limiting resistance and third current-limiting resistance are respectively and in the partial pressure shaping circuit
Signal output end is connected, and the first current-limiting resistance clock for accessing first double D trigger in parallel with first voltage-stabiliser tube is defeated
Enter end, second current-limiting resistance input end of clock that accesses second double D trigger in parallel with second voltage-stabiliser tube, institute
State the input terminal access 12V DC power supply of the first double D trigger, the reset terminal of first double D trigger and second couple of D
The reset terminal of trigger is connected, and the output end of first double D trigger is connected with the input terminal of second double D trigger,
The output end of second double D trigger is connected with the first resistor, the base of the first resistor and the first transistor
Extremely it is connected, the collector of the first transistor is connected with the anode of second diode, the transmitting of the first transistor
Pole is connected with the base stage of the second transistor, and the collector of the second transistor is connected with the DC relay, described
DC relay is also connected with the cathode of second diode and accesses direct current 12V power supply, second capacitor one end and institute
The base stage for stating the first transistor is connected, and the other end is connected with the emitter of the second transistor；The third current-limiting resistance with
The third voltage-stabiliser tube is in parallel and connects with first filter capacitor and first diode, the second resistance and the third
Resistance is connected in parallel on the both ends of the first diode, the reset terminal of the first diode and second double D trigger respectively
It is connected；
Signal passes through the first current-limiting resistance, the second current-limiting resistance and the first voltage-stabiliser tube and the second voltage-stabiliser tube clipping, whole respectively
2 clock pulse signal ends to first double D trigger and the second double D trigger are sent after shape；If phase sequence is correct, second
Double D trigger exports high level, the first transistor and second transistor is connected, the moving together contact of the DC relay is closed
It closes, blower rotates forward；If phase sequence mistake, the second double D trigger output end keeps low level, the first transistor and second transistor
Cut-off, the break contact closure of the DC relay, blower still rotate forward.
Optionally, the partial pressure shaping circuit includes voltage comparator, divider resistance, pull-up resistor；The divider resistance
Parallel connection accesses the input terminal of the voltage comparator, and the output end of each voltage comparator is connected to a pull-up electricity respectively
Resistance.
Optionally, the voltage comparator is No. four differential comparators, the non-inverting input terminal of three No. four differential comparators
It is connected, the divider resistance parallel connection accesses the non-inverting input terminal of No. four differential comparator, is No. four differential comparator
Anti-phase input provide comparison signal；The inverting input terminal of No. four differential comparator is connected with two divider resistances respectively,
Reference signal is provided for the positive input of No. four differential comparator；The output end of No. four differential comparator is respectively with one
A pull-up resistor is connected.
Optionally, the phase sequence adjustment circuit includes solid-state relay, according to the circuit of testing the phase sequence to three-phase alternating current
The processing of signal is closed the moving together contact of solid-state relay when phase sequence is normal, and solid-state relay connects three-phase alternating current sequence
To the input terminal of blower；In phase sequence exception, it is closed the break contact of solid-state relay, solid-state relay is by three-phase alternating current tune
Whole phase sequence is followed by the input terminal of blower.
Optionally, the blower reversal protection control device further includes DC power supply circuit, the DC power supply circuit packet
Transformer, rectifier diode, capacitor, resistance and voltage-stabiliser tube are included, the output end of the transformer and the rectifier diode form
Bridge rectifier input terminal connection；The filtering that the output end of the bridge rectifier and the capacitor, resistance form
Circuit input end is connected；The filter circuit output end is connect with the voltage-stabiliser tube；
Alternating current is depressured through transformer, and the alternating current after decompression is converted to direct current after bridge rectifier rectifies
Electricity, the direct current is by being in control direct current of voltage regulation through pressure stabilizing after filter circuit filtering.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The present invention provides a kind of blower reversal protection control device, and circuit of testing the phase sequence completes the detection to power phase,
When phase sequence is incorrect, the control signal of output abnormality phase sequence；Phase sequence adjustment circuit receives control signal, passes through solid-state relay
It realizes the adjustment to power phase, solves the problems, such as that three-phase alternating-current motor is caused to invert because of power phase wrong, without disconnected
Electricity and manual operation can save human and material resources to the maximum extent, and high efficiency completes the adjustment of phase sequence, guarantee that three-phase alternating current is electronic
The normal operation of machine.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of circuit diagram of blower reversal protection control device of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the partial pressure shaping circuit in a kind of blower reversal protection control device of the embodiment of the present invention；
Fig. 3 is the circuit diagram of the circuit of testing the phase sequence in a kind of blower reversal protection control device of the embodiment of the present invention；
Fig. 4 is the circuit diagram of the DC power supply circuit in a kind of blower reversal protection control device of the embodiment of the present invention；
Fig. 5 is the circuit diagram of the phase sequence adjustment circuit in a kind of blower reversal protection control device of the embodiment of the present invention；
Fig. 6 is the timing waveform of the circuit of testing the phase sequence in a kind of blower reversal protection control device of the embodiment of the present invention
Figure.
Wherein, figure label are as follows: divider resistance R1-R9, the first current-limiting resistance R10, the second current-limiting resistance R11, third limit
Leakage resistance R12, first resistor R15, second resistance R13,3rd resistor R14, resistance R16, pull-up resistor R17-R19, four voltages
Comparison amplifier LM339, three-phase alternating current Ua-Uc, three-phase square wave pulse signal Ua-P-Uc-P, the first double D trigger IC1,
Two double D trigger IC2, the first filter capacitor C1, the second filter capacitor C2, the first voltage-stabiliser tube VS1, the second voltage-stabiliser tube VS2, third
Voltage-stabiliser tube VS3, first diode VD1, the second diode VD2, the first transistor VT1, second transistor VT2 and DC relay
KA, transformer T1, rectifier diode VD3-VD6, capacitor C3-C4, zener diode V1, solid-state relay HFS21, moving together contact
KA1, break contact KA2.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of blower reversal protection control devices, are able to achieve cutting automatically for power phase
It changes, improves efficiency.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is a kind of circuit diagram of blower reversal protection control device of the embodiment of the present invention.
As shown in Figure 1, a kind of blower reversal protection control device, comprising: partial pressure shaping circuit, circuit of testing the phase sequence and phase
Sequence adjustment circuit；
The output end of the partial pressure shaping circuit is connected with the input terminal of the circuit of testing the phase sequence, for what be will test
Three-phase voltage partial pressure is shaped to three-phase square wave pulse signal, and sends the three-phase square wave pulse signal to the Phase sequence detection
Circuit；The circuit of testing the phase sequence is used to carry out Phase sequence detection to the three-phase square wave pulse signal, judges the three-phase square wave
Whether the timing of pulse signal correct, if incorrect, the control signal of output abnormality phase sequence, and will control signal send to it is described
Phase sequence adjustment circuit.
Fig. 5 is the circuit diagram of the phase sequence adjustment circuit in a kind of blower reversal protection control device of the embodiment of the present invention.
As shown in figure 5, the phase sequence adjustment circuit includes solid-state relay HFS21, the phase sequence adjustment circuit receives institute
The control signal of the abnormal phase sequence of circuit of testing the phase sequence output is stated, and abnormal phase sequence is adjusted using solid-state relay HFS21
It is whole.
Fig. 3 is the circuit diagram of the circuit of testing the phase sequence in a kind of blower reversal protection control device of the embodiment of the present invention.
As shown in figure 3, the circuit of testing the phase sequence, the first current-limiting resistance R10, the second current-limiting resistance R11, third current limliting electricity
Hinder R12, the first voltage-stabiliser tube VS1, the second voltage-stabiliser tube VS2, third voltage-stabiliser tube VS3, the first double D trigger IC1, second pair of D triggering
Device IC2, the first filter capacitor C1, the second filter capacitor C2, first diode VD1, the second diode VD2, the first transistor
VT1, second transistor VT2 and DC relay KA；
The first current-limiting resistance R10, the second current-limiting resistance R11, third current-limiting resistance R12 respectively with the partial pressure shaping
Signal output end in circuit is connected, the first current-limiting resistance R10 access first pair D in parallel with the first voltage-stabiliser tube VS1
The input end of clock of trigger IC1, the second current-limiting resistance R11 access described second in parallel with the second voltage-stabiliser tube VS2
The input end of clock of double D trigger IC2, the input terminal access 12V DC power supply of the first double D trigger IC1, described first
The reset terminal of double D trigger IC1 is connected with the reset terminal of the second double D trigger IC2, the first double D trigger IC1's
Output end is connected with the input terminal of the second double D trigger IC2, the output end of the second double D trigger IC2 and described the
The series connection of one resistance, the first resistor R15 are connected with the base stage of the first transistor VT1, the collection of the first transistor VT1
Electrode is connected with the anode of the second diode VD2, the emitter and the second transistor of the first transistor VT1
The base stage of VT2 is connected, and the collector of the second transistor VT2 is connected with the DC relay KA, the DC relay
KA is also connected with the cathode of the second diode VD2 and accesses direct current 12V power supply, described one end second capacitor C2 and described the
The base stage of one transistor VT1 is connected, and the other end is connected with the emitter of the second transistor VT2；The third current-limiting resistance
R12 is in parallel with the third voltage-stabiliser tube VS3 and connects with the first filter capacitor C1 and first diode VD1, and described second
The resistance R13 and 3rd resistor R14 is connected in parallel on the both ends of the first diode VD1 respectively, the first diode VD1 with
The reset terminal of the second double D trigger IC2 is connected；
Signal passes through the first current-limiting resistance R10, the second current-limiting resistance R11 and the first voltage-stabiliser tube VS1 and the second pressure stabilizing respectively
2 clock pulse signals to the first double D trigger IC1 and the second double D trigger IC2 are sent after pipe VS2 clipping, shaping
End；If phase sequence is correct, the second double D trigger IC2 exports high level, leads the first transistor VT1 and second transistor VT2
Logical, the moving together contact closure of the DC relay KA, blower rotates forward；If phase sequence mistake, the second double D trigger IC2 output
End keeps low level, the first transistor VT1 and second transistor VT2 cut-off, and the break contact of the DC relay KA is closed,
Blower still rotates forward.
Fig. 6 is the timing waveform of the circuit of testing the phase sequence in a kind of blower reversal protection control device of the embodiment of the present invention
Figure.
As shown in fig. 6, if phase sequence is correct (i.e. positive pulse occurs in tri- phase sequence of Ua-P, Ub-P, Uc-P), the integrated electricity of IC2
Road exports high level, VT1, VT2 conducting, and KA coil obtains electric, the moving together contact closure of KA, blower rotating forward, at this point, the end Uc-P passes through
R12 and VS3 exports low level to the reset terminal output reset signal of IC2 integrated circuit, due to starting to discharge on C2, make VT1,
VT2 continues conducting and DC relay KA is maintained to continue electric, and load works normally, and completes the change of three-phase alternating current a cycle
Change.
If phase sequence mistake, VT1, VT2 cut-off, the coil losing electricity of DC relay KA, the break contact closure of KA, blower
Still rotate forward.
Fig. 2 is the circuit diagram of the partial pressure shaping circuit in a kind of blower reversal protection control device of the embodiment of the present invention.
As shown in Figure 1, the partial pressure shaping circuit includes voltage comparator, divider resistance R1-R9, pull-up resistor R17-
R19；The divider resistance R1-R9 parallel connection accesses the input terminal of the voltage comparator, the output of each voltage comparator
End is connected to a pull-up resistor R17-R19 respectively.
The voltage comparator is No. four differential comparator LM339, the homophase input of three No. four differential comparator LM339
End is connected, and the divider resistance R1-R9 parallel connection accesses the non-inverting input terminal of No. four differential comparator LM339, is described four
The anti-phase input of road differential comparator LM339 provides comparison signal；The inverting input terminal of No. four differential comparator LM339 point
It does not connect with two divider resistances, provides reference signal for the positive input of No. four differential comparator LM339；Four tunnel
The output end of differential comparator LM339 is connected with a pull-up resistor respectively.
Ua, Ub, Uc voltage between lines are exchange 380V, and Ua, Ub, Uc connect R1, R2, R3, R4, R5, R6 divider resistance, be
LM339 anti-phase input provides comparison signal；Ua, Ub, Uc connect R1, R2, R3, R7, R8, R9 divider resistance, input for LM339 positive
It provides reference signal (0V).When Ua, Ub, Uc are lower than zero, the pulse signal that Ua-P, Ub-P, Uc-P are can be waited until.
Fig. 5 is the circuit diagram of the phase sequence adjustment circuit in a kind of blower reversal protection control device of the embodiment of the present invention.
As shown in figure 5, the phase sequence adjustment circuit includes solid-state relay HFS21, according to the circuit of testing the phase sequence pair
The processing of three-phase ac signal is closed the moving together contact KA1 of solid-state relay HFS21, solid-state relay when phase sequence is normal
Three-phase alternating current sequence is connected to the input terminal of blower by HFS21；In phase sequence exception, it is closed the dynamic circuit breaker of solid-state relay HFS21
Three-phase alternating current adjustment phase sequence is followed by the input terminal of blower by contact KA2, solid-state relay HFS21, and blower guarantees to rotate forward.
Fig. 4 is the circuit diagram of the DC power supply circuit in a kind of blower reversal protection control device of the embodiment of the present invention.
As shown in figure 4, the blower reversal protection control device further includes DC power supply circuit, the DC power supply circuit
Including transformer T1, bridge rectifier, filter circuit, zener diode V1, the transformer T1 output end and the bridge
In the input terminal connection of formula rectification circuit, the bridge rectifier is by rectifier diode VD3-VD6's；The bridge rectifier electricity
The output end on road is connected with the filter circuit input terminal；The filter circuit output end is connect with the voltage-stabiliser tube, described
Filter circuit includes capacitor C3-C4 and resistance R16 composition.
Alternating current is depressured through transformer, and the alternating current after decompression is converted to direct current after bridge rectifier rectifies
Electricity, the direct current is by being in control direct current of voltage regulation through pressure stabilizing after filter circuit filtering.
DC power supply circuit provides direct current 12V power supply by way of Ub, Uc decompression and bridge rectifier for system.
Alternating current Ub, Uc are exchange 15V by 380 decompression of exchange after transformer T1, by by VD3, VD4, VD5, VD6 group
At bridge rectifier electric current after be converted to direct current, C3, C4 and R15 are filter circuit, DC waveform are stabilized, most afterwards through voltage-stabiliser tube
V1 obtains required direct current 12V.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of blower reversal protection control device characterized by comprising partial pressure shaping circuit, circuit of testing the phase sequence and phase
Sequence adjustment circuit；
The output end of the partial pressure shaping circuit is connected with the input terminal of the circuit of testing the phase sequence, the three-phase for will test
Voltage is shaped to three-phase square wave pulse signal, and sends the three-phase square wave pulse signal to the Phase sequence detection electricity
Road；The circuit of testing the phase sequence is used to carry out Phase sequence detection to the three-phase square wave pulse signal, judges the three-phase square wave arteries and veins
Whether the timing for rushing signal is correct, if incorrect, the control signal of output abnormality phase sequence, and send control signal to the phase
Sequence adjustment circuit；
The phase sequence adjustment circuit includes solid-state relay, and the phase sequence adjustment circuit receives the circuit of testing the phase sequence output
The control signal of abnormal phase sequence, and abnormal phase sequence is adjusted using solid-state relay.
2. a kind of blower reversal protection control device according to claim 1, which is characterized in that the Phase sequence detection electricity
Road, including the first current-limiting resistance, the second current-limiting resistance, third current-limiting resistance, the first voltage-stabiliser tube, the second voltage-stabiliser tube, third pressure stabilizing
Pipe, the first double D trigger, the second double D trigger, the first filter capacitor, the second filter capacitor, first diode, the two or two pole
Pipe, the first transistor, second transistor and DC relay；
First current-limiting resistance, second current-limiting resistance and third current-limiting resistance respectively with the signal in the partial pressure shaping circuit
Output end is connected, the first current-limiting resistance input end of clock for accessing first double D trigger in parallel with first voltage-stabiliser tube,
Second current-limiting resistance input end of clock that accesses second double D trigger in parallel with second voltage-stabiliser tube, described
The input terminal of one double D trigger accesses 12V DC power supply, and the reset terminal of first double D trigger and second couple of D are triggered
The reset terminal of device is connected, and the output end of first double D trigger is connected with the input terminal of second double D trigger, described
The output end of second double D trigger is connected with the first resistor, the base stage phase of the first resistor and the first transistor
Even, the collector of the first transistor is connected with the anode of second diode, the emitter of the first transistor and
The base stage of the second transistor is connected, and the collector of the second transistor is connected with the DC relay, the direct current
Relay is also connected with the cathode of second diode and accesses direct current 12V power supply, second capacitor one end and described the
The base stage of one transistor is connected, and the other end is connected with the emitter of the second transistor；The third current-limiting resistance with it is described
Third voltage-stabiliser tube is in parallel and connects with first filter capacitor and first diode, the second resistance and the 3rd resistor
It is connected in parallel on the both ends of the first diode respectively, the first diode is connected with the reset terminal of second double D trigger；
Signal is respectively after the first current-limiting resistance, the second current-limiting resistance and the first voltage-stabiliser tube and the second voltage-stabiliser tube clipping, shaping
Send 2 clock pulse signal ends to first double D trigger and the second double D trigger；If phase sequence is correct, second couple of D
Trigger exports high level, and the first transistor and second transistor is connected, the moving together contact closure of the DC relay, wind
Machine rotates forward；If phase sequence mistake, the second double D trigger output end keeps low level, the first transistor and second transistor cut-off,
The break contact of the DC relay is closed, and blower still rotates forward.
3. a kind of blower reversal protection control device according to claim 1, which is characterized in that the partial pressure shaping circuit
Including voltage comparator, divider resistance, pull-up resistor；The divider resistance parallel connection accesses the input terminal of the voltage comparator,
The output end of each voltage comparator is connected to a pull-up resistor respectively.
4. a kind of blower reversal protection control device according to claim 3, which is characterized in that the voltage comparator is
The non-inverting input terminal of No. four differential comparators, three No. four differential comparators is connected, the divider resistance parallel connection access described four
The non-inverting input terminal of road differential comparator, the anti-phase input for No. four differential comparator provide comparison signal；Four tunnel
The inverting input terminal of differential comparator is connected with two divider resistances respectively, is mentioned for the positive input of No. four differential comparator
For reference signal；The output end of No. four differential comparator is connected with a pull-up resistor respectively.
5. a kind of blower reversal protection control device according to claim 1, which is characterized in that the phase sequence adjustment circuit
Including solid-state relay, the processing according to the circuit of testing the phase sequence to three-phase ac signal is closed solid-state when phase sequence is normal
Three-phase alternating current sequence is connected to the input terminal of blower by the moving together contact of relay, solid-state relay；In phase sequence exception, closure
Three-phase alternating current adjustment phase sequence is followed by the input terminal of blower by the break contact of solid-state relay, solid-state relay.
6. a kind of blower reversal protection control device according to claim 1, which is characterized in that the blower reversal protection
Control device further includes DC power supply circuit, the DC power supply circuit include transformer, rectifier diode, capacitor, resistance and
Voltage-stabiliser tube, the output end of the transformer are connect with the input terminal for the bridge rectifier that the rectifier diode forms；It is described
The output end of bridge rectifier is connected with the filter circuit input terminal that the capacitor, resistance form；The filter circuit is defeated
Outlet is connect with the voltage-stabiliser tube；
Alternating current is depressured through transformer, and the alternating current after decompression is converted to direct current, institute after bridge rectifier rectifies
It states and is in control direct current of voltage regulation through pressure stabilizing after direct current is filtered by filter circuit.
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| CN201810842924.4A CN108953207B (en) | 2018-07-27 | 2018-07-27 | Fan reversal protection control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161327A (en) * | 2019-06-04 | 2019-08-23 | 珠海格力电器股份有限公司 | A kind of detection device for phase sequence, permanent magnet synchronous motor and its phase sequence detecting method |
| CN111426890A (en) * | 2020-04-22 | 2020-07-17 | 海信（山东）空调有限公司 | Phase sequence detection circuit, outdoor unit, air conditioner and control method |
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