CN108953207B - Fan reversal protection control device - Google Patents
Fan reversal protection control device Download PDFInfo
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- CN108953207B CN108953207B CN201810842924.4A CN201810842924A CN108953207B CN 108953207 B CN108953207 B CN 108953207B CN 201810842924 A CN201810842924 A CN 201810842924A CN 108953207 B CN108953207 B CN 108953207B
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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 fan reverse rotation protection control device. The device includes: the phase sequence detection circuit comprises a voltage division shaping circuit, a phase sequence detection circuit and a phase sequence adjusting circuit; the output end of the voltage division shaping circuit is connected with the input end of the phase sequence detection circuit and is used for dividing and shaping the detected three-phase voltage into a three-phase square wave pulse signal and transmitting the three-phase square wave pulse signal to the phase sequence detection circuit; the phase sequence detection circuit carries out phase sequence detection on the three-phase square wave pulse signal, judges whether the time sequence of the three-phase square wave pulse signal is correct or not, outputs a control signal of an abnormal phase sequence if the time sequence of the three-phase square wave pulse signal is incorrect, and transmits the control signal to the phase sequence adjusting circuit; the phase sequence adjusting circuit comprises a solid-state relay, receives the control signal of the abnormal phase sequence output by the phase sequence detecting circuit and adjusts the abnormal phase sequence by utilizing the solid-state relay. The invention can realize the automatic switching of the power phase sequence and improve the efficiency.
Description
Technical Field
The invention relates to the technical field of fan control, in particular to a fan reverse rotation protection control device.
Background
The modern building has the characteristics of complex structure, more internal combustible decorative materials, more vertical pipes, high personnel density and the like, once a fire disaster occurs, a large amount of toxic smoke and heat are generated in the combustion process of indoor building decorative materials, furniture, clothes, other combustible objects and the like, the smoke and the heat can rapidly spread along corridors, evacuation channels, staircases and ventilation vertical shafts to form a strong chimney effect, and great casualties and property loss are caused.
At present, the fire smoke is mainly controlled by two modes of mechanical smoke prevention and mechanical smoke exhaust. The smoke preventing and discharging system consists of blower, pipeline, valve, air supplying port, smoke exhausting port, blower, valve, air exhausting port and other linkage units. The mechanical smoke prevention is that enough fresh air is fed into the positions needing smoke prevention, such as an evacuation channel and the like, so that the pressure of the fresh air is maintained to be higher than that of other positions of a building, and smoke generated in an ignition area is blocked outside the smoke prevention positions; the mechanical smoke exhaust is a smoke exhaust mode that high-temperature smoke generated in an ignition area is sucked by a mechanical smoke exhaust fan and is exhausted outdoors through a smoke exhaust pipeline, a smoke exhaust port and other components. The fan used in the building smoke prevention and exhaust system is generally a three-phase alternating current motor, and has the characteristics of reliable operation, firmness, durability, convenient maintenance and the like. The three-phase alternating current is widely applied to daily production and life, and the three-phase alternating current is almost adopted for the production, transmission and distribution of electric energy.
At present, in the industry of fire fighting systems in China, the control of a fan for fire fighting generally does not adopt a measure for preventing reverse rotation. Under the conditions of switching power supplies, installing transformers, wiring motors, overhauling and the like, the phase sequence of a three-phase power supply can be changed, a control loop is normally directly cut off through a phase sequence protector, and then any two power lines are manually exchanged to be restarted, so that the three-phase alternating-current motor rotates forwards; or the phase sequence indicator and the recognizer are adopted to detect the phase sequence of the power supply, and after the phase sequence is detected to be correct, the power supply of the three-phase alternating current motor is connected to start the three-phase alternating current motor. The two modes both need to manually adjust the power phase sequence under the condition of power failure, cannot automatically switch the power phase sequence, need power failure and manual operation in the adjustment process, and are low in efficiency.
Disclosure of Invention
The invention aims to provide a fan reverse rotation protection control device which can realize automatic switching of power supply phase sequences and improve efficiency.
In order to achieve the purpose, the invention provides the following scheme:
a fan reverse rotation protection control device comprises: the phase sequence detection circuit comprises a voltage division shaping circuit, a phase sequence detection circuit and a phase sequence adjusting circuit;
the output end of the voltage division shaping circuit is connected with the input end of the phase sequence detection circuit and is used for dividing and shaping the detected three-phase voltage into a three-phase square wave pulse signal and transmitting the three-phase square wave pulse signal to the phase sequence detection circuit; the phase sequence detection circuit is used for carrying out phase sequence detection on the three-phase square wave pulse signals, judging whether the time sequence of the three-phase square wave pulse signals is correct or not, outputting control signals of an abnormal phase sequence if the time sequence of the three-phase square wave pulse signals is incorrect, and transmitting the control signals to the phase sequence adjusting circuit;
the phase sequence adjusting circuit comprises a solid-state relay, receives the control signal of the abnormal phase sequence output by the phase sequence detecting circuit, and adjusts the abnormal phase sequence by using the solid-state relay.
Optionally, the phase sequence detection circuit includes a first current-limiting resistor, a second current-limiting resistor, a third current-limiting resistor, a first voltage regulator tube, a second voltage regulator tube, a third voltage regulator tube, a first dual-D flip-flop, a second dual-D flip-flop, a first filter capacitor, a second filter capacitor, a first diode, a second diode, a first transistor, a second transistor, and a dc relay;
the first current limiting resistor, the second current limiting resistor and the third current limiting resistor are respectively connected with a signal output end in the voltage division shaping circuit, the first current limiting resistor and the first voltage regulator tube are connected in parallel to a clock input end of the first dual-D trigger, the second current limiting resistor and the second voltage regulator tube are connected in parallel to a clock input end of the second dual-D trigger, an input end of the first dual-D trigger is connected with a 12V direct-current power supply, a reset end of the first dual-D trigger is connected with a reset end of the second dual-D trigger, an output end of the first dual-D trigger is connected with an input end of the second dual-D trigger, an output end of the second dual-D trigger is connected with the first resistor in series, the first resistor is connected with a base electrode of the first transistor, and a collector electrode of the first transistor is connected with an anode of the second diode, the emitter of the first transistor is connected with the base of the second transistor, the collector of the second transistor is connected with the direct current relay, the direct current relay is also connected with the cathode of the second diode and is connected to a direct current 12V power supply, one end of the second capacitor is connected with the base of the first transistor, and the other end of the second capacitor is connected with the emitter of the second transistor; the third current limiting resistor is connected with the third voltage stabilizing tube in parallel and is connected with the first filter capacitor and the first diode in series, the second resistor and the third resistor are respectively connected with two ends of the first diode in parallel, and the first diode is connected with the reset end of the second double-D trigger;
the signals are respectively subjected to amplitude limiting and shaping by a first current limiting resistor, a second current limiting resistor, a first voltage regulator tube and a second voltage regulator tube and then are sent to 2 clock pulse signal ends of the first double-D trigger and the second double-D trigger; if the phase sequence is correct, the second dual-D trigger outputs high level to enable the first transistor and the second transistor to be conducted, the movable contact of the direct current relay is closed, and the fan rotates forwards; if the phase sequence is wrong, the output end of the second double-D trigger keeps low level, the first transistor and the second transistor are cut off, the break contact of the direct current relay is closed, and the fan still rotates forwards.
Optionally, the voltage division shaping circuit includes a voltage comparator, a voltage division resistor, and a pull-up resistor; the voltage dividing resistor is connected in parallel to the input end of the voltage comparator, and the output end of each voltage comparator is connected with a pull-up resistor.
Optionally, the voltage comparator is a four-way differential comparator, non-inverting input terminals of three four-way differential comparators are connected, and the voltage dividing resistor is connected in parallel to the non-inverting input terminals of the four-way differential comparator to provide a comparison signal for inverting input of the four-way differential comparator; the inverting input end of the four-way differential comparator is respectively connected with two divider resistors in series to provide a reference signal for the positive phase input of the four-way differential comparator; and the output ends of the four-way differential comparator are respectively connected with a pull-up resistor.
Optionally, the phase sequence adjusting circuit includes a solid-state relay, and according to the processing of the phase sequence detecting circuit on the three-phase alternating current signal, when the phase sequence is normal, a moving contact of the solid-state relay is closed, and the solid-state relay connects the three-phase alternating current to the input end of the fan in sequence; and when the phase sequence is abnormal, the dynamic break contact of the solid-state relay is closed, and the solid-state relay adjusts the phase sequence of the three-phase alternating current and then connects the three-phase alternating current to the input end of the fan.
Optionally, the fan reverse rotation protection control device further includes a dc power supply circuit, the dc power supply circuit includes a transformer, a rectifier diode, a capacitor, a resistor and a voltage regulator tube, and an output end of the transformer is connected to an input end of a bridge rectifier circuit formed by the rectifier diode; the output end of the bridge rectifier circuit is connected with the input end of a filter circuit consisting of the capacitor and the resistor; the output end of the filter circuit is connected with the voltage stabilizing tube;
the alternating current is subjected to voltage reduction through a transformer, the alternating current after voltage reduction is converted into direct current after being rectified by a bridge rectifier circuit, and the direct current is filtered by a filter circuit and then is subjected to voltage stabilization through a voltage stabilizing tube to obtain stabilized direct current.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a fan reversal protection control device.A phase sequence detection circuit finishes the detection of a power supply phase sequence, and outputs a control signal of an abnormal phase sequence when the phase sequence is incorrect; the phase sequence adjusting circuit receives the control signal, realizes the adjustment of the power supply phase sequence through the solid-state relay, solves the problem of reversal of the three-phase alternating-current motor caused by wrong connection of the power supply phase sequence, does not need power failure and manual operation, can save manpower and material resources to the maximum extent, finishes the adjustment of the phase sequence with high efficiency, and ensures the normal operation of the three-phase alternating-current motor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a circuit diagram of a fan reverse rotation protection control device according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a voltage division shaping circuit in a fan reverse rotation protection control device according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a phase sequence detecting circuit in the fan reverse rotation protection control device according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a DC power circuit in the fan reverse rotation protection control device according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a phase sequence adjusting circuit in the fan reverse rotation protection control device according to an embodiment of the present invention;
fig. 6 is a timing waveform diagram of a phase sequence detection circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
Wherein the reference numbers in the figures are: the three-phase alternating current three-phase direct current power supply comprises voltage dividing resistors R1-R9, a first current limiting resistor R10, a second current limiting resistor R11, a third current limiting resistor R12, a first resistor R15, a second resistor R13, a third resistor R13, a pull-up resistor R13-R13, a four-voltage comparison amplifier LM339, three-phase alternating current Ua-Uc, a three-phase square wave pulse signal Ua-P-Uc-P, a first dual-D trigger IC 13, a second dual-D trigger IC 13, a first filter capacitor C13, a second filter capacitor C13, a first voltage regulator VS 13, a second voltage regulator VS 13, a third voltage regulator VS 13, a first diode VD 13, a second diode VD 13, a first transistor VT 13, a second transistor VT 13, a direct current relay, a transformer T13, a rectifier diode VD 13-VD 13, a capacitor C13-C13, a voltage stabilizing resistor HFKA, a solid-state relay V13, a solid-state contact HFKA 13 and a 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a fan reverse rotation protection control device which can realize automatic switching of power supply phase sequences and improve efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a circuit diagram of a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 1, a fan reverse rotation protection control device includes: the phase sequence detection circuit comprises a voltage division shaping circuit, a phase sequence detection circuit and a phase sequence adjusting circuit;
the output end of the voltage division shaping circuit is connected with the input end of the phase sequence detection circuit and is used for dividing and shaping the detected three-phase voltage into a three-phase square wave pulse signal and transmitting the three-phase square wave pulse signal to the phase sequence detection circuit; the phase sequence detection circuit is used for carrying out phase sequence detection on the three-phase square wave pulse signals, judging whether the time sequence of the three-phase square wave pulse signals is correct or not, outputting control signals of abnormal phase sequences if the time sequence of the three-phase square wave pulse signals is incorrect, and transmitting the control signals to the phase sequence adjusting circuit.
Fig. 5 is a circuit diagram of a phase sequence adjusting circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 5, the phase sequence adjusting circuit includes a solid state relay HFS21, and receives the control signal of the abnormal phase sequence output by the phase sequence detecting circuit, and adjusts the abnormal phase sequence using a solid state relay HFS 21.
Fig. 3 is a circuit diagram of a phase sequence detection circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 3, the phase sequence detection circuit includes a first current-limiting resistor R10, a second current-limiting resistor R11, a third current-limiting resistor R12, a first voltage regulator VS1, a second voltage regulator VS2, a third voltage regulator VS3, a first dual-D flip-flop IC1, a second dual-D flip-flop IC2, a first filter capacitor C1, a second filter capacitor C2, a first diode VD1, a second diode VD2, a first transistor VT1, a second transistor VT2, and a dc relay KA;
the first current limiting resistor R10, the second current limiting resistor R11 and the third current limiting resistor R12 are respectively connected to signal output terminals of the voltage dividing and shaping circuit, the first current limiting resistor R10 and the first voltage regulator VS1 are connected in parallel to a clock input terminal of the first dual-D flip-flop IC1, the second current limiting resistor R11 and the second voltage regulator VS2 are connected in parallel to a clock input terminal of the second dual-D flip-flop IC2, an input terminal of the first dual-D flip-flop IC1 is connected to a 12V dc power supply, a reset terminal of the first dual-D flip-flop IC1 is connected to a reset terminal of the second dual-D flip-flop IC2, an output terminal of the first dual-D flip-flop IC1 is connected to an input terminal of the second dual-D flip-flop IC2, an output terminal of the second dual-D flip-flop IC2 is connected to the first series resistor, the first resistor R15 is connected to a base terminal of the first transistor VT1, and a collector terminal of the first dual-pole transistor VT1 is connected to a positive electrode VD2, the emitter of the first transistor VT1 is connected with the base of the second transistor VT2, 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 is connected with a DC 12V power supply, one end of the second capacitor C2 is connected with the base of the first transistor VT1, and the other end of the second capacitor C2 is connected with the emitter of the second transistor VT 2; the third current-limiting resistor R12 is connected in parallel with the third voltage regulator VS3 and in series with the first filter capacitor C1 and the first diode VD1, the second resistor R13 and the third resistor R14 are respectively connected in parallel at two ends of the first diode VD1, and the first diode VD1 is connected with the reset end of the second dual-D flip-flop IC 2;
signals are respectively subjected to amplitude limiting and shaping through a first current limiting resistor R10, a second current limiting resistor R11, a first voltage regulator tube VS1 and a second voltage regulator tube VS2 and then are sent to 2 clock pulse signal ends of the first dual-D flip-flop IC1 and the second dual-D flip-flop IC 2; if the phase sequence is correct, the second dual-D trigger IC2 outputs high level to enable the first transistor VT1 and the second transistor VT2 to be conducted, the movable contact of the direct current relay KA is closed, and the fan rotates forwards; if the phase sequence is wrong, the output end of the second dual-D trigger IC2 keeps low level, the first transistor VT1 and the second transistor VT2 are cut off, the break contact of the direct current relay KA is closed, and the fan still rotates forwards.
Fig. 6 is a timing waveform diagram of a phase sequence detection circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 6, if the phase sequence is correct (i.e. positive pulses appear in the sequence of three phases Ua-P, Ub-P, Uc-P), the IC2 integrated circuit outputs a high level, VT1 and VT2 are turned on, the KA coil is energized, the make contact of KA is closed, the fan rotates forward, at this time, the Uc-P terminal outputs a reset signal to the reset terminal of the IC2 integrated circuit through R12 and VS3, and outputs a low level, and as the C2 starts to discharge, VT1 and VT2 are continuously turned on to maintain the direct current relay KA to be energized continuously, the load works normally, and the change of three-phase alternating current in one cycle is completed.
If the phase sequence is wrong, VT1 and VT2 are cut off, a coil of the direct current relay KA loses power, a break contact of the KA is closed, and the fan still rotates forwards.
Fig. 2 is a circuit diagram of a voltage division shaping circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 1, the voltage division shaping circuit comprises a voltage comparator, voltage division resistors R1-R9 and pull-up resistors R17-R19; the voltage dividing resistors R1-R9 are connected in parallel to the input ends of the voltage comparators, and the output end of each voltage comparator is respectively connected with a pull-up resistor R17-R19.
The voltage comparator is a four-way differential comparator LM339, the non-inverting input ends of three four-way differential comparators LM339 are connected, and the divider resistors R1-R9 are connected in parallel to the non-inverting input end of the four-way differential comparator LM339 to provide comparison signals for the inverting input of the four-way differential comparator LM 339; the inverting input end of the four-way differential comparator LM339 is respectively connected with two divider resistors in series to provide a reference signal for the positive phase input of the four-way differential comparator LM 339; the output ends of the four-way differential comparator LM339 are respectively connected with a pull-up resistor.
The voltage among the Ua line, the Ub line and the Uc line is alternating current 380V, the Ua line, the Ub line and the Uc line are connected with voltage dividing resistors R1 voltage, R2 voltage, R3 voltage, R4 voltage, R5 voltage and R6 voltage dividing resistors, and comparison signals are provided for the reverse phase input of the LM339 voltage; ua, Ub and Uc are connected with voltage dividing resistors R1, R2, R3, R7, R8 and R9, and provide a reference signal (0V) for the positive input of LM 339. When Ua, Ub, Uc are lower than zero, it can wait until Ua-P, Ub-P, Uc-P is the resulting pulse signal.
Fig. 5 is a circuit diagram of a phase sequence adjusting circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 5, the phase sequence adjusting circuit includes a solid state relay HFS21, according to the processing of the three-phase alternating current signal by the phase sequence detecting circuit, when the phase sequence is normal, the movable contact KA1 of the solid state relay HFS21 is closed, and the solid state relay HFS21 connects the three-phase alternating current sequence to the input end of the fan; when the phase sequence is abnormal, a dynamic break contact KA2 of the solid state relay HFS21 is closed, the solid state relay HFS21 adjusts the phase sequence of the three-phase alternating current and then connects the three-phase alternating current to the input end of the fan, and the fan ensures positive rotation.
Fig. 4 is a circuit diagram of a dc power circuit in a fan reverse rotation protection control device according to an embodiment of the present invention.
As shown in fig. 4, the fan reverse rotation protection control device further includes a dc power supply circuit, the dc power supply circuit includes a transformer T1, a bridge rectifier circuit, a filter circuit, and a zener diode V1, an output terminal of the transformer T1 is connected to an input terminal of the bridge rectifier circuit, and the bridge rectifier circuit is formed by rectifier diodes VD3-VD 6; the output end of the bridge rectifier circuit is connected with the input end of the filter circuit; the output end of the filter circuit is connected with the voltage regulator tube, and the filter circuit comprises capacitors C3-C4 and a resistor R16.
The alternating current is subjected to voltage reduction through a transformer, the alternating current after voltage reduction is converted into direct current after being rectified by a bridge rectifier circuit, and the direct current is filtered by a filter circuit and then is subjected to voltage stabilization through a voltage stabilizing tube to obtain stabilized direct current.
The direct current power supply circuit provides a direct current 12V power supply for the system in a Ub and Uc voltage reduction and bridge rectification mode.
Alternating currents Ub and Uc are subjected to voltage reduction by an alternating current 380 through a transformer T1 to form alternating current 15V, the alternating current is converted into direct current after passing through a bridge type rectifying current consisting of VD3, VD4, VD5 and VD6, C3, C4 and R15 are filter circuits, direct current waveforms are stabilized, and finally required direct current 12V is obtained through a voltage stabilizing tube V1.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. The utility model provides a fan reversal protection controlling means which characterized in that includes: the phase sequence detection circuit comprises a voltage division shaping circuit, a phase sequence detection circuit and a phase sequence adjusting circuit;
the output end of the voltage division shaping circuit is connected with the input end of the phase sequence detection circuit and is used for dividing and shaping the detected three-phase voltage into a three-phase square wave pulse signal and transmitting the three-phase square wave pulse signal to the phase sequence detection circuit; the phase sequence detection circuit is used for carrying out phase sequence detection on the three-phase square wave pulse signals, judging whether the time sequence of the three-phase square wave pulse signals is correct or not, outputting control signals of an abnormal phase sequence if the time sequence of the three-phase square wave pulse signals is incorrect, and transmitting the control signals to the phase sequence adjusting circuit;
the phase sequence adjusting circuit comprises a solid-state relay, and when the phase sequence is normal, a dynamic contact of the solid-state relay is closed according to the processing of the phase sequence detecting circuit on the three-phase alternating current signal, and the solid-state relay connects the three-phase alternating current to the input end of the fan in sequence; and when the phase sequence is abnormal, the dynamic break contact of the solid-state relay is closed, and the solid-state relay adjusts the phase sequence of the three-phase alternating current and then connects the three-phase alternating current to the input end of the fan.
2. The fan reverse rotation protection control device according to claim 1, wherein the phase sequence detection circuit comprises a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a first voltage regulator tube, a second voltage regulator tube, a third voltage regulator tube, a first double-D trigger, a second double-D trigger, a first filter capacitor, a second filter capacitor, a first diode, a second diode, a first transistor, a second transistor and a direct current relay;
the first current limiting resistor, the second current limiting resistor and the third current limiting resistor are respectively connected with a signal output end in the voltage division shaping circuit, the first current limiting resistor and the first voltage regulator tube are connected in parallel to a clock input end of the first dual-D trigger, the second current limiting resistor and the second voltage regulator tube are connected in parallel to a clock input end of the second dual-D trigger, an input end of the first dual-D trigger is connected with a 12V direct-current power supply, a reset end of the first dual-D trigger is connected with a reset end of the second dual-D trigger, an output end of the first dual-D trigger is connected with an input end of the second dual-D trigger, an output end of the second dual-D trigger is connected with the first current limiting resistor in series, the first current limiting resistor is connected with a base electrode of the first transistor, and a collector electrode of the first transistor is connected with an anode electrode of the second diode, the emitter of the first transistor is connected with the base of the second transistor, the collector of the second transistor is connected with the direct current relay, the direct current relay is also connected with the cathode of the second diode and is connected to a direct current 12V power supply, one end of the second filter capacitor is connected with the base of the first transistor, and the other end of the second filter capacitor is connected with the emitter of the second transistor; the third current limiting resistor is connected with the third voltage stabilizing tube in parallel and is connected with the first filter capacitor and the first diode in series, the second current limiting resistor and the third current limiting resistor are respectively connected with two ends of the first diode in parallel, and the first diode is connected with the reset end of the second double-D trigger;
the signals are respectively subjected to amplitude limiting and shaping by a first current limiting resistor, a second current limiting resistor, a first voltage regulator tube and a second voltage regulator tube and then are sent to 2 clock pulse signal ends of the first double-D trigger and the second double-D trigger; if the phase sequence is correct, the second dual-D trigger outputs high level to enable the first transistor and the second transistor to be conducted, the movable contact of the direct current relay is closed, and the fan rotates forwards; if the phase sequence is wrong, the output end of the second double-D trigger keeps low level, the first transistor and the second transistor are cut off, the break contact of the direct current relay is closed, and the fan still rotates forwards.
3. The fan reverse-rotation protection control device according to claim 1, wherein the voltage division shaping circuit comprises a voltage comparator, a voltage division resistor and a pull-up resistor; the voltage dividing resistor is connected in parallel to the input end of the voltage comparator, and the output end of each voltage comparator is connected with a pull-up resistor;
the voltage comparators are four-way differential comparators, the non-inverting input ends of three four-way differential comparators are connected, and the divider resistor is connected in parallel to the non-inverting input ends of the four-way differential comparators to provide comparison signals for the inverting inputs of the four-way differential comparators; the inverting input end of the four-way differential comparator is respectively connected with two divider resistors in series to provide a reference signal for the positive phase input of the four-way differential comparator; and the output ends of the four-way differential comparator are respectively connected with a pull-up resistor.
4. The fan reverse rotation protection control device according to claim 1, further comprising a dc power circuit, wherein the dc power circuit comprises a transformer, a rectifier diode, a capacitor, a resistor and a voltage regulator tube, and an output terminal of the transformer is connected to an input terminal of a bridge rectifier circuit formed by the rectifier diode; the output end of the bridge rectifier circuit is connected with the input end of a filter circuit consisting of the capacitor and the resistor; the output end of the filter circuit is connected with the voltage stabilizing tube;
the alternating current is subjected to voltage reduction through a transformer, the alternating current after voltage reduction is converted into direct current after being rectified by a bridge rectifier circuit, and the direct current is filtered by a filter circuit and then is subjected to voltage stabilization through a voltage stabilizing tube to obtain stabilized direct current.
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| 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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