CN109579388A - Compressor SS (soft start) control circuit, method and air conditioner - Google Patents
Compressor SS (soft start) control circuit, method and air conditioner Download PDFInfo
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- CN109579388A CN109579388A CN201811413709.9A CN201811413709A CN109579388A CN 109579388 A CN109579388 A CN 109579388A CN 201811413709 A CN201811413709 A CN 201811413709A CN 109579388 A CN109579388 A CN 109579388A
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- 239000003990 capacitor Substances 0.000 claims description 73
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- 229910052710 silicon Inorganic materials 0.000 claims description 24
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of compressor SS (soft start) control circuit, method and air conditioner, circuit of the present invention includes power circuit, the first control relay circuit, soft starting plate, the second control relay circuit, voltage detecting circuit and controller；Controller is when supply voltage is higher than preset voltage value, the first level is exported to the first control relay circuit and soft starting plate, power circuit is set to start compressor by the first relay and soft starting plate, when supply voltage is lower than preset voltage value, second electrical level is exported to the second control relay circuit, power circuit is set to directly initiate compressor by the second relay, technical solution of the present invention only just starts soft starting plate when supply voltage is excessively high, improves reliability and the service life of soft starting plate.
Description
Technical Field
The invention relates to the field of motor control, in particular to a soft start control circuit and method for a compressor and an air conditioner.
Background
In recent years, with the increasing load of air conditioners, the surge current at the start of the air conditioner compressor is increasing, and how to reduce the surge current and protect electronic components is an important subject of research in the field of air conditioners. Soft start boards are widely used to protect compressor relays and other electronics.
The normal condition has the compressor work logic of soft start board to be, after the power supply, the controller control compressor relay, soft start board to make the compressor work.
The soft starting board is mainly composed of silicon controlled rectifiers, and is controlled by the controller, when the compressor relay is closed, the silicon controlled rectifiers in the soft starting board are switched on, so that the voltage supplied to the compressor is reduced by half, the load current when the compressor is started is reduced, the impact current is weakened, the compressor relay and other electronic components are protected, after the compressor runs, the silicon controlled rectifiers are switched off, and the air conditioner can run normally.
This working logic's defect lies in when the air conditioner starts, can not accurate judgement whether need the silicon controlled rectifier to protect press relay, when starting voltage is lower, the soft start board switches on as usual, probably causes the compressor start-up moment not enough, leads to the compressor frequent start, the slow problem of compressor start appears, long-term use, the frequent turn-on of silicon controlled rectifier is turn-off and probably leads to the damage of silicon controlled rectifier, makes the soft start board lose effect, causes press relay and other electronic components's damage.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a compressor soft start control circuit and method and an air conditioner, and aims to solve the technical problem that a soft start board, a compressor relay and other electronic components are easily damaged due to the fact that the soft start board is not used effectively in the prior art.
In order to achieve the above object, the present invention provides a soft start board control circuit for a compressor, which comprises a power circuit, a first relay control circuit, a soft start board, a second relay control circuit, a voltage detection circuit and a controller; the power supply circuit is respectively connected with the voltage detection circuit, the first relay control circuit and the second relay control circuit, the controller is respectively connected with the voltage detection circuit, the first relay control circuit, the second relay control circuit and the soft start board, the first relay control circuit is connected with the soft start board, the soft start board is connected with the compressor, and the compressor is also connected with the second relay control circuit; wherein,
the power supply circuit is used for providing power supply voltage for starting the compressor;
the voltage detection circuit is used for detecting the power supply voltage;
the soft starting plate is used for carrying out soft starting on the compressor;
the first relay control circuit is used for being conducted when the controller outputs a first level, so that the power supply circuit supplies power to the compressor through the soft starting board;
the second relay control circuit is used for being conducted when the controller outputs a second level, so that the power supply circuit directly supplies power to the compressor;
the controller is used for outputting a first level to the first relay control circuit and the soft starting board when the power supply voltage is higher than a preset voltage value, and the power supply circuit supplies power to the compressor through the soft starting board.
Preferably, the controller is further configured to output a second level to the second relay control circuit when the power supply voltage is not higher than a preset voltage value, and the power supply circuit directly supplies power to the compressor.
Preferably, the voltage detection circuit comprises a first resistor, a second resistor, a third resistor, a first diode and a first capacitor; wherein,
the first end of the first resistor is connected with the power supply circuit, and the second end of the first resistor is grounded through the second resistor;
the cathode of the first diode is connected with a first power supply, and the anode of the first diode is connected with the first end of the third resistor;
the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the controller;
and the first end of the first capacitor is connected with the second end of the third resistor, and the second end of the first capacitor is grounded.
Preferably, the first relay control circuit comprises a second diode, a first triode and a first relay; wherein,
the cathode of the second diode is connected with the first end of the control coil of the first relay, and the anode of the second diode is connected with the second end of the control coil of the first relay;
the first end of the control coil of the first relay is connected with the power circuit, the second end of the control coil of the first relay is connected with the collector of the first triode, the first contact of the first relay is connected with the soft starting board, and the second contact of the first relay is connected with the live wire of the power line;
the base electrode of the first triode is connected with the controller, and the emitting electrode of the first triode is grounded.
Preferably, the second relay control circuit includes a third diode, a second triode, and a second relay; wherein,
the cathode of the third diode is connected with the first end of the control coil of the second relay, and the anode of the third diode is connected with the second end of the control coil of the second relay;
the first end of the control coil of the second relay is connected with the power circuit, the second end of the control coil of the second relay is connected with the collector of the second triode, the first contact of the second relay is connected with the compressor, and the second contact of the second relay is connected with the live wire of the power line;
and the base electrode of the second triode is connected with the controller, and the emitting electrode of the second triode is grounded.
Preferably, the power circuit comprises a voltage dependent resistor, a transformer, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a second capacitor, a third capacitor and a fourth resistor; wherein,
the first end of the piezoresistor is connected with a live wire of a power line, and the second end of the piezoresistor is connected with the first end of the transformer;
the second end of the transformer is connected with a zero line of the power line, the third end of the transformer is respectively connected with the cathode of the fourth diode and the anode of the sixth diode, and the fourth end of the transformer is respectively connected with the cathode of the fifth diode and the anode of the seventh diode;
the anode of the fourth diode is connected with the anode of the fifth diode, and the cathode of the fourth diode is connected with the anode of the sixth diode;
the cathode of the fifth diode is connected with the anode of the seventh diode;
the cathode of the sixth diode is connected with the anode of the eighth diode;
the cathode of the seventh diode is connected with the anode of the eighth diode;
the cathode of the eighth diode is connected with the first end of the fourth resistor, and the cathode of the eighth diode is further connected with the first end of the second capacitor, the first end of the third capacitor and the voltage detection circuit respectively;
a first end of the second capacitor is connected with a second power supply, and a second end of the second capacitor is respectively connected with an anode of the fourth diode and an anode of the fifth diode;
the first end of the third capacitor is connected with the first end of the fourth resistor, and the second end of the third capacitor is respectively connected with the anode of the fourth diode and the anode of the fifth diode;
and the second end of the fourth resistor is respectively connected with the first relay control circuit and the second relay control circuit.
Preferably, the soft start board comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a ninth diode, a twelfth diode, a soft start chip and a thyristor; wherein,
the first end of the fifth resistor is connected with the controller, and the second end of the fifth resistor is connected with the first end of the soft start chip;
the second end of the soft start chip is grounded, the third end of the soft start chip is connected with the first end of the sixth resistor, and the fourth end of the soft start chip is connected with the first end of the controllable silicon;
the second end of the sixth resistor is connected with the anode of the twelfth pole tube;
the ninth resistor and the tenth resistor are connected in parallel and then are respectively connected with the cathode of the twelfth pole tube and the compressor;
the first end of the fourth capacitor is connected with the fourth end of the soft start chip, the second end of the fourth capacitor is connected with the first end of the fifth capacitor, and the second end of the fourth capacitor is also connected with the first relay control circuit;
a second end of the fifth capacitor is connected with a second end of the sixth resistor;
a first end of the seventh resistor is connected with a first end of the controllable silicon, and a second end of the seventh resistor is connected with a cathode of the ninth diode;
the anode of the ninth diode is connected with the anode of the twelfth diode;
the second end of the controllable silicon is connected with the compressor, and the third end of the controllable silicon is connected with the first end of the eighth resistor;
a second end of the eighth resistor is connected with a first end of the sixth capacitor;
and the second end of the sixth capacitor is connected with the second end of the controllable silicon.
The invention also provides a soft start control method of the compressor, which comprises the following steps:
acquiring a power supply voltage;
judging whether the power supply voltage is higher than a preset voltage value;
when the power supply voltage is higher than a preset voltage value, driving a first relay and a soft starting plate to be connected and a second relay to be disconnected so as to start the compressor through the soft starting plate;
and when the power supply voltage is not higher than a preset voltage value, the first relay and the soft starting plate are driven to be disconnected and the second relay is driven to be connected, so that the compressor is directly started.
The invention also provides an air conditioner which comprises the compressor soft start control circuit, or comprises a processor and a computer readable storage medium, wherein the program stored in the computer readable storage medium is executed by the processor to realize the compressor soft start control method.
The circuit comprises a power supply circuit, a first relay control circuit, a soft starting board, a second relay control circuit, a voltage detection circuit and a controller; the power circuit is used for providing power voltage for starting the compressor; the voltage detection circuit is used for detecting the power supply voltage; the soft starting plate is used for carrying out soft starting on the compressor; the first relay control circuit is used for being conducted when the controller outputs a first level, so that the power supply circuit supplies power to the compressor through the soft starting board; the second relay control circuit is used for being conducted when the controller outputs a second level, so that the power supply circuit directly supplies power to the compressor; the controller is used for outputting a first level to the first relay control circuit and the soft starting board when the power supply voltage is higher than a preset voltage value; otherwise then to second relay control circuit output second level, through above-mentioned technical scheme, improved the reliability and the life of soft start board, avoid the compressor frequent start-stop, improve the air conditioner quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a soft start control circuit for a compressor according to the present invention;
FIG. 2 is a schematic diagram of a soft start control circuit of a compressor according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a soft-start control method for a compressor according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Power supply circuit | VCC1～VCC2 | First power supply to second power supply |
| 200 | First relay control circuit | R1～R10 | First to tenth resistors |
| 300 | Voltage detection circuit | C1～C6 | First to sixth capacitors |
| 400 | Second relay control circuit | D1～D10 | First to twelfth diode |
| RQ | Soft starting board | K1～K2 | First to second relays |
| MC | Compressor with a compressor housing having a plurality of compressor blades | IC1 | Soft start chip |
| U1 | Controller | N1 | Silicon controlled rectifier |
| PTC | Voltage dependent resistor | P1 | Live wire of power line |
| T1 | Transformer device | P2 | Zero line of power line |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a soft start control circuit of a compressor, and referring to fig. 1, in one embodiment, the circuit includes a power circuit 100, a first relay control circuit 200, a soft start board RQ, a voltage detection circuit 300, a second relay control circuit 400, and a controller U1; the power supply circuit 100 is connected to the voltage detection circuit 300, the first relay control circuit 200 and the second relay control circuit 400, the controller U1 is connected to the voltage detection circuit 300, the first relay control circuit 200, the second relay control circuit 400 and the soft start board RQ, the first relay control circuit 200 is connected to the soft start board RQ, the soft start board RQ is connected to the compressor MC, and the compressor MC is further connected to the second relay control circuit 400; the power circuit 100 is configured to provide a power voltage for starting the compressor MC; the voltage detection circuit 300 is configured to detect the power supply voltage; the soft start plate RQ is used for performing soft start on the compressor MC; the first relay control circuit 200 is configured to be turned on when the controller U1 outputs a first level, so that the power circuit supplies power to the compressor MC through the soft start board RQ; the second relay control circuit 400 is configured to be turned on when the controller U1 outputs a second level, so that the power supply circuit directly supplies power to the compressor MC; the controller U1 is configured to output a first level to the first relay control circuit 200 and the soft starter RQ when the supply voltage is higher than a preset voltage value, where the supply circuit supplies power to the compressor MC through the soft starter RQ.
Further, the controller U1 is further configured to output a second level to the second relay control circuit 400 when the power supply voltage is not higher than a preset voltage value, and the power supply circuit directly supplies power to the compressor MC.
It should be noted that, in this embodiment, a voltage detection circuit 300 and a second relay control circuit 400 are added on the basis of the prior art, and the voltage detection circuit 300 determines the level of the power supply voltage, so as to determine whether a soft start protection relay is needed, if so, the controller U1 provides a suitable start voltage to the compressor MC through the first relay control circuit 200 and the soft start board RQ for soft start; if not, hard start is performed by the controller U1 directly through the second relay control circuit 400.
It should be understood that the soft start refers to that the voltage is slowly increased from zero to the rated voltage, so that no impact torque exists in the whole process of starting the motor, and the motor is smoothly started and operated; the hard start refers to direct start.
The circuit comprises a power supply circuit, a first relay control circuit, a soft start board, a second relay control circuit, a voltage detection circuit and a controller; the power circuit is used for providing power voltage for starting the compressor; the voltage detection circuit is used for detecting the power supply voltage; the soft starting plate is used for carrying out soft starting on the compressor; the first relay control circuit is used for being conducted when the controller outputs a first level, so that the power supply circuit supplies power to the compressor through the soft starting board; the second relay control circuit is used for being conducted when the controller outputs a second level, so that the power supply circuit directly supplies power to the compressor; the controller is used for outputting a first level to the first relay control circuit and the soft starting board when the power supply voltage is higher than a preset voltage value; otherwise then to second relay control circuit output second level, through above-mentioned technical scheme, improved the reliability and the life of soft start board, avoid the compressor frequent start-stop, improve the air conditioner quality.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a soft start control circuit of a compressor according to an embodiment of the present invention.
In this embodiment, the voltage detection circuit 300 includes a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, and a first capacitor C1; a first end of the first resistor R1 is connected to the power circuit 100, and a second end of the first resistor R1 is grounded via the second resistor R2; the cathode of the first diode D1 is connected with a first power supply VCC1, and the anode of the first diode D2 is connected with the first end of a third resistor R3; a first end of the third resistor R3 is connected with a second end of the first resistor R1, and a second end of the third resistor R3 is connected with the controller U1; the first end of the first capacitor C1 is connected to the second end of the third resistor R3, and the second end of the first capacitor C1 is grounded.
It can be understood that the first resistor R1 and the second resistor R2 are voltage dividing resistors, the first diode D1 is a voltage limiting diode, the third resistor R3 is a current limiting resistor, and the first capacitor C1 is a filter capacitor.
In a specific implementation, the voltage detection circuit 300 detects the output voltage connected to +12V, divides the voltage by the first resistor R1 and the second resistor R2, and transmits the detected voltage signal to the controller U1.
Further, the first relay control circuit 200 includes a second diode D2, a first transistor Q1, and a first relay K1; wherein a cathode of the second diode D2 is connected to a first end of the control coil of the first relay K1, and an anode of the second diode D2 is connected to a second end of the control coil of the first relay K1; a first end of a control coil of the first relay K1 is connected with the power circuit 100, a second end of the control coil of the first relay K1 is connected with a collector of the first triode Q1, a first contact of the first relay K1 is connected with the soft starting board RQ, and a second contact of the first relay K1 is connected with a live wire P1 of a power line; the base of the first transistor Q1 is connected to the controller U1, and the emitter of the first transistor Q1 is grounded.
It can be understood that the first relay control circuit 200 is connected to the controller U1 and the soft starter RQ respectively, so that the controller U1 can control the conduction of the first relay K1 and the soft starter RQ, thereby implementing the soft start of the compressor MC.
Further, the second relay control circuit 400 includes a third diode D3, a second transistor Q2, and a second relay K2; wherein a cathode of the third diode D3 is connected to a first end of the control coil of the second relay K2, and an anode of the third diode D3 is connected to a second end of the control coil of the second relay K2; a first end of a control coil of the second relay K2 is connected to the power circuit 100, a second end of the control coil of the second relay K2 is connected to a collector of the second transistor Q2, a first contact of the second relay K2 is connected to the compressor MC, and a second contact of the second relay K2 is connected to a live wire P1 of a power line; the base of the second transistor Q2 is connected to the controller U1, and the emitter of the second transistor Q2 is grounded.
It is understood that the second relay control circuit 400 is connected to the controller U1 and the compressor MC, respectively, so that the controller U1 can realize a hard start of the compressor MC by controlling the conduction of the second relay K2.
Further, the soft-start board comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a ninth diode D9, a twelfth diode D10, a soft-start chip IC1 and a thyristor N1; a first end of the fifth resistor R5 is connected with the controller U1, and a second end of the fifth resistor R5 is connected with a first end of the soft start chip IC 1; the second end of the soft-start chip IC1 is grounded, the third end of the soft-start chip IC1 is connected with the first end of the sixth resistor R6, and the fourth end of the soft-start chip IC1 is connected with the first end of the controllable silicon N1; a second end of the sixth resistor R6 is connected to the anode of the twelfth diode D10; the ninth resistor R9 and the tenth resistor R10 are connected in parallel and then connected to the cathode of the twelfth diode D10 and the compressor MC respectively; a first end of the fourth capacitor C4 is connected to a fourth end of the soft-start chip IC1, a second end of the fourth capacitor C4 is connected to a first end of the fifth capacitor C5, and a second end of the fourth capacitor C4 is further connected to the control circuit of the first relay K1; a second end of the fifth capacitor C5 is connected with a second end of the sixth resistor R6; a first end of the seventh resistor R7 is connected with a first end of the thyristor N1, and a second end of the seventh resistor R7 is connected with a cathode of the ninth diode D9; the anode of the ninth diode D9 is connected to the anode of the twelfth diode D10; a second end of the controllable silicon N1 is connected with the compressor MC, and a third end of the controllable silicon N1 is connected with a first end of the eighth resistor R8; a second end of the eighth resistor R8 is connected with a first end of the sixth capacitor C6; the second end of the sixth capacitor C6 is connected with the second end of the thyristor N1.
It can be understood that, when the voltage detection circuit 300 determines that the soft start protection relay is required, the controller U1 provides a suitable start voltage for the compressor MC by controlling the conduction angle of the thyristor N1, so as to protect the compressor and the relay and ensure the normal start of the compressor.
In a specific implementation, a first port of the controller U1 is connected to the first transistor Q1, and is configured to control a first relay K1; a second port of the controller U1 is connected with the second triode Q2 and is used for controlling a second relay K2; a third port of the controller U1 is connected to a second terminal of the third resistor R3 for receiving a supply voltage; and a fourth port of the controller U1 is connected with the soft starting board RQ and is used for controlling the soft starting board RQ.
The +12V dc voltage from the power circuit 100 flows to the first transistor Q1 through the first relay K1, and the controller U1 controls the on/off of the first transistor Q1, when the first port and the fourth port of the controller U1 both output high level signals, the first transistor Q1 is turned on, the first relay K1 is turned on, and the output end of the first relay K1 is closed, so that the soft start of the compressor MC is realized.
The +12V dc voltage from the power circuit 100 flows to the second transistor Q2 through the second relay K2, and the controller U1 controls the on/off of the second transistor Q2, when the second port of the controller U1 outputs a high level signal, the second transistor Q2 is turned on, the second relay K2 is turned on, and the output terminal of the first relay K2 is closed to directly start the compressor MC.
Further, in order to make the power voltage more stable, after the power is supplied by the power supply, the current needs to be subjected to voltage stabilization, rectification and filtering, the power circuit 100 includes a voltage dependent resistor PTC, a transformer T1, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a second capacitor C2, a third capacitor C3 and a fourth resistor R4; wherein a first end of the piezoresistor PTC is connected with a live wire P1 of a power line, and a second end of the piezoresistor PTC is connected with a first end of the transformer T1; a second end of the transformer T1 is connected to a neutral line P2 of the power line, a third end of the transformer T1 is connected to a cathode of the fourth diode D4 and an anode of the sixth diode D6, respectively, and a fourth end of the transformer T1 is connected to a cathode of the fifth diode D5 and an anode of the seventh diode D7, respectively; an anode of the fourth diode D4 is connected to an anode of the fifth diode D5, and a cathode of the fourth diode D4 is connected to an anode of the sixth diode D6; the cathode of the fifth diode D5 is connected to the anode of the seventh diode D7; the cathode of the sixth diode D6 is connected to the anode of the eighth diode D8; the cathode of the seventh diode D7 is connected to the anode of the eighth diode D8; a cathode of the eighth diode D8 is connected to the first end of the fourth resistor R4, and a cathode of the eighth diode D8 is further connected to the first end of the second capacitor C2, the first end of the third capacitor C3 and the voltage detection circuit 300, respectively; a first end of the second capacitor C2 is connected to a second power source VCC2, and a second end of the second capacitor C2 is connected to an anode of the fourth diode D4 and an anode of the fifth diode D5, respectively; a first end of the third capacitor C3 is connected to a first end of the fourth resistor R4, and a second end of the third capacitor C3 is connected to an anode of the fourth diode D4 and an anode of the fifth diode D5, respectively; a second end of the fourth resistor R4 is connected to the first relay control circuit 200 and the second relay control circuit 300, respectively.
It should be noted that the varistor PTC is an anti-surge varistor, because a strong pulse, i.e. a surge, is generated at the moment when the power supply is just turned on, it is likely that the circuit will burn out at a moment, and the varistor is a voltage-limiting element sensitive to voltage change, and can effectively protect the circuit.
The transformer T1 is a device for changing an alternating voltage by using the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil, and a magnetic core.
In a specific implementation, when the power supply is just powered on, the current passes through the piezoresistor PTC from the live wire P1 end of the power supply wire, then is stepped down by the transformer T1, and then is rectified and filtered.
It can be understood that the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7 and the eighth diode D8 form a rectifying circuit; the second capacitor C2 is a smoothing capacitor and is used for filtering out alternating current components to make the output direct current smoother; the third capacitor C3 and the fourth resistor R4 form an RC filter circuit, and the combination mode of the second capacitor C2 and the third capacitor C3 connected in parallel can improve the filtering effect of the smoothing capacitor.
In a specific implementation, when the power supply voltage is 220V, the voltage output through the transformer T1 is +12V, and after passing through the smoothing capacitor and the RC filter circuit, a dc voltage of +12V is output.
The working principle of the present embodiment is explained below with reference to fig. 2:
when the voltage in the power supply is 220V, the voltage output through the transformer T1 is +12V, when the voltage is too high, the output voltage of the transformer T1 is increased, the voltage detected by the voltage detection circuit 300 is increased, the voltage feedback value received by the controller U1 is increased, the voltage value received by the controller U1 corresponds to a value b when the power supply voltage is higher than a certain preset value a through the resistance value settings of the first resistor R1 and the second resistor R2, so that a logic is set, when the voltage c received by the third port of the controller U1 is greater than b, the first port and the fourth port of the controller U1 output high levels, and the first relay K1 and the soft start board RQ are controlled to be conducted to start the compressor MC; when c is less than or equal to b, the soft starting plate RQ is not conducted, the second relay K2 is conducted, and the compressor MC is directly started by the second relay K2.
Specifically, when the power supply voltage is too high and c is greater than b, the first port and the fourth port of the controller U1 output high levels, the second port keeps low level, the soft starting board RQ and the first relay K1 are switched on, the thyristor performs chopping, the conduction angle of the thyristor decreases with the increase of c, the conduction angle of the thyristor gradually decreases from 90 degrees, the first relay K1 is protected from large current impact, and when the compressor MC is started and operates normally, the fourth port outputs low level and the thyristor is turned off.
When the voltage is normal or low and c is less than or equal to b, the first port and the fourth port of the controller U1 keep low level, the second port outputs high level, the soft starting board RQ and the first relay K1 are turned off, and the power supply voltage directly acts on the compressor MC through the second relay K2 to enable the compressor MC to be started normally.
This embodiment is through the soft start application technique that takes voltage to detect, can effectively detect whether the compressor needs the soft start, and can select soft start and hard start, can be according to the conduction angle of the value control silicon controlled rectifier of voltage when using the soft start, effectively protect press relay and other electronic components, and guarantee that the compressor has enough big starting voltage, guarantee the normal start of compressor, avoid frequently opening the phenomenon because of the compressor that the too much pressure of soft start board leads to stops, promote the air conditioner quality.
Referring to fig. 3, fig. 3 is a flowchart illustrating a soft start control method for a compressor according to an embodiment of the present invention.
In this embodiment, the soft start control method of the compressor includes the following steps:
s10: acquiring a power supply voltage;
s20: judging whether the power supply voltage is higher than a preset voltage value;
s30: when the power supply voltage is higher than a preset voltage value, the first relay and the soft starting plate are driven to be connected and the second relay is driven to be disconnected, so that the compressor is started through the soft starting plate.
Further, after step S20, the method further includes:
s30': and when the power supply voltage is not higher than a preset voltage value, the first relay and the soft starting plate are driven to be disconnected and the second relay is driven to be connected, so that the compressor is directly started.
It should be noted that, after power is supplied by a power supply, a current passes through the power supply circuit 100, then passes through the voltage detection circuit 300, the controller U1, and then passes through the first relay K1 and the second relay K2, the opening and closing of the relays are controlled by the controller U1, the controller U1 receives a signal from the voltage detection circuit 300, determines whether the soft start board RQ needs to be opened to protect the first relay K1, and finally, the function of controlling the compressor MC is achieved.
Specifically, when the controller U1 receives a power supply voltage, it determines whether the power supply voltage is higher than a preset voltage value, and when the voltage is too high, turns on the soft start RQ to protect the first relay K1, and controls a conduction angle of a thyristor, so that the compressor MC can be started normally; when supply voltage is normal or when low, directly switch on second relay K2, do not use soft start board RQ, make compressor MC can normal boot, guarantee the normal use of air conditioner.
When the air conditioner is started to operate, the controller U1 controls the on and off of the first relay K1 and the second relay K2 and the on and off of the silicon controlled rectifier in the soft starting board RQ by outputting high and low levels.
When the first relay K1 is closed, current passes through the silicon controlled rectifier in the soft starting plate RQ, and the controller U1 controls the conduction angle of the silicon controlled rectifier, so that the first relay K1 is protected, and the compressor MC is ensured to be normally started.
When the second relay K2 is closed, the compressor MC is normally started without turning on the first relay K1 and the soft starter RQ.
This embodiment is through detecting mains voltage to judge whether voltage is higher than the default and decide whether need the soft start, realized carrying out the accurate control of soft start to the compressor.
The invention also provides an air conditioner which comprises the compressor soft start control circuit, or comprises a processor and a computer readable storage medium, wherein the program stored in the computer readable storage medium is executed by the processor to realize the compressor soft start control method. The circuit structure of the compressor soft start control circuit of the air conditioner and the steps of the compressor soft start control method can refer to the above embodiments, and are not described herein again; it can be understood that, since the air conditioner of the present embodiment adopts the technical solution of the above-mentioned compressor soft start control circuit or compressor soft start control method, the air conditioner has all the above-mentioned beneficial effects.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A soft start control circuit of a compressor is characterized by comprising a power supply circuit, a first relay control circuit, a soft start board, a second relay control circuit, a voltage detection circuit and a controller; the power supply circuit is respectively connected with the voltage detection circuit, the first relay control circuit and the second relay control circuit, the controller is respectively connected with the voltage detection circuit, the first relay control circuit, the second relay control circuit and the soft start board, the first relay control circuit is connected with the soft start board, the soft start board is connected with the compressor, and the compressor is also connected with the second relay control circuit; wherein,
the power supply circuit is used for providing power supply voltage for starting the compressor;
the voltage detection circuit is used for detecting the power supply voltage;
the soft starting plate is used for carrying out soft starting on the compressor;
the first relay control circuit is used for being conducted when the controller outputs a first level, so that the power supply circuit supplies power to the compressor through the soft starting board;
the second relay control circuit is used for being conducted when the controller outputs a second level, so that the power supply circuit directly supplies power to the compressor;
the controller is used for outputting a first level to the first relay control circuit and the soft starting board when the power supply voltage is higher than a preset voltage value, and the power supply circuit supplies power to the compressor through the soft starting board.
2. The compressor soft start control circuit of claim 1 wherein said controller is further configured to output a second level to said second relay control circuit when said power supply voltage is not greater than a predetermined voltage level, said power supply circuit providing power directly to said compressor.
3. The compressor soft start control circuit as claimed in claim 2, wherein said voltage detection circuit includes a first resistor, a second resistor, a third resistor, a first diode and a first capacitor; wherein,
the first end of the first resistor is connected with the power supply circuit, and the second end of the first resistor is grounded through the second resistor;
the cathode of the first diode is connected with a first power supply, and the anode of the first diode is connected with the first end of the third resistor;
the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the controller;
and the first end of the first capacitor is connected with the second end of the third resistor, and the second end of the first capacitor is grounded.
4. The compressor soft start control circuit as claimed in claim 2, wherein said first relay control circuit includes a second diode, a first triode, and a first relay; wherein,
the cathode of the second diode is connected with the first end of the control coil of the first relay, and the anode of the second diode is connected with the second end of the control coil of the first relay;
the first end of the control coil of the first relay is connected with the power circuit, the second end of the control coil of the first relay is connected with the collector of the first triode, the first contact of the first relay is connected with the soft starting board, and the second contact of the first relay is connected with the live wire of the power line;
the base electrode of the first triode is connected with the controller, and the emitting electrode of the first triode is grounded.
5. The compressor soft start control circuit of claim 2, wherein the second relay control circuit comprises a third diode, a second transistor and a second relay; wherein,
the cathode of the third diode is connected with the first end of the control coil of the second relay, and the anode of the third diode is connected with the second end of the control coil of the second relay;
the first end of the control coil of the second relay is connected with the power circuit, the second end of the control coil of the second relay is connected with the collector of the second triode, the first contact of the second relay is connected with the compressor, and the second contact of the second relay is connected with the live wire of the power line;
and the base electrode of the second triode is connected with the controller, and the emitting electrode of the second triode is grounded.
6. The compressor soft start control circuit as claimed in claim 2, wherein said power circuit includes a voltage dependent resistor, a transformer, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a second capacitor, a third capacitor and a fourth resistor; wherein,
the first end of the piezoresistor is connected with a live wire of a power line, and the second end of the piezoresistor is connected with the first end of the transformer;
the second end of the transformer is connected with a zero line of the power line, the third end of the transformer is respectively connected with the cathode of the fourth diode and the anode of the sixth diode, and the fourth end of the transformer is respectively connected with the cathode of the fifth diode and the anode of the seventh diode;
the anode of the fourth diode is connected with the anode of the fifth diode, and the cathode of the fourth diode is connected with the anode of the sixth diode;
the cathode of the fifth diode is connected with the anode of the seventh diode;
the cathode of the sixth diode is connected with the anode of the eighth diode;
the cathode of the seventh diode is connected with the anode of the eighth diode;
the cathode of the eighth diode is connected with the first end of the fourth resistor, and the cathode of the eighth diode is further connected with the first end of the second capacitor, the first end of the third capacitor and the voltage detection circuit respectively;
a first end of the second capacitor is connected with a second power supply, and a second end of the second capacitor is respectively connected with an anode of the fourth diode and an anode of the fifth diode;
the first end of the third capacitor is connected with the first end of the fourth resistor, and the second end of the third capacitor is respectively connected with the anode of the fourth diode and the anode of the fifth diode;
and the second end of the fourth resistor is respectively connected with the first relay control circuit and the second relay control circuit.
7. The compressor soft start control circuit of claim 2, wherein the soft start board comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a ninth diode, a twelfth diode, a soft start chip and a thyristor; wherein,
the first end of the fifth resistor is connected with the controller, and the second end of the fifth resistor is connected with the first end of the soft start chip;
the second end of the soft start chip is grounded, the third end of the soft start chip is connected with the first end of the sixth resistor, and the fourth end of the soft start chip is connected with the first end of the controllable silicon;
the second end of the sixth resistor is connected with the anode of the twelfth pole tube;
the ninth resistor and the tenth resistor are connected in parallel and then are respectively connected with the cathode of the twelfth pole tube and the compressor;
the first end of the fourth capacitor is connected with the fourth end of the soft start chip, the second end of the fourth capacitor is connected with the first end of the fifth capacitor, and the second end of the fourth capacitor is also connected with the first relay control circuit;
a second end of the fifth capacitor is connected with a second end of the sixth resistor;
a first end of the seventh resistor is connected with a first end of the controllable silicon, and a second end of the seventh resistor is connected with a cathode of the ninth diode;
the anode of the ninth diode is connected with the anode of the twelfth diode;
the second end of the controllable silicon is connected with the compressor, and the third end of the controllable silicon is connected with the first end of the eighth resistor;
a second end of the eighth resistor is connected with a first end of the sixth capacitor;
and the second end of the sixth capacitor is connected with the second end of the controllable silicon.
8. A soft start control method for a compressor is characterized by comprising the following steps:
acquiring a power supply voltage;
judging whether the power supply voltage is higher than a preset voltage value;
when the power supply voltage is higher than a preset voltage value, the first relay and the soft starting plate are driven to be connected and the second relay is driven to be disconnected, so that the compressor is started through the soft starting plate.
9. A soft-start control method of a compressor as set forth in claim 8, wherein after said determining whether said power supply voltage is higher than a preset voltage value, said method further includes:
and when the power supply voltage is not higher than a preset voltage value, the first relay and the soft starting plate are driven to be disconnected and the second relay is driven to be connected, so that the compressor is directly started.
10. An air conditioner characterized in that the air conditioner comprises the compressor soft start control circuit as claimed in any one of claims 1 to 7, or the air conditioner comprises a processor and a computer readable storage medium, wherein the computer readable storage medium stores a program that when executed by the processor implements the compressor soft start control method as claimed in any one of claims 8 to 9.
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| CN111023525A (en) * | 2019-12-18 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Control circuit and method and air conditioner |
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