CN105571044A - Control method for variable frequency air conditioner - Google Patents
Control method for variable frequency air conditioner Download PDFInfo
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- CN105571044A CN105571044A CN201410527295.8A CN201410527295A CN105571044A CN 105571044 A CN105571044 A CN 105571044A CN 201410527295 A CN201410527295 A CN 201410527295A CN 105571044 A CN105571044 A CN 105571044A
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- cross valve
- air conditioner
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- main control
- pfc function
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Abstract
The invention discloses a control method for a variable frequency air conditioner to prolong service life of filter capacitor. The control method comprises the following steps that whether a four-way valve to reverse is determined; if the four-way valve is to reverse, the following steps are executed that first a PFC function is closed, then four-way valve reversing is executed and the PFC function is opened again. Inburst voltage is produced on two ends of the filter capacitor upon the reversing of the four-way valve of the variable frequency air conditioner; and the inburst voltage may be larger than rated voltage of the filter capacitor, so the capacitor can be damaged. Inburst voltage produced upon four-way valve reversing can be prevented from being added to two ends of the filter capacitor, so a risk that the filter capacitor is damaged due to the inburst voltage larger than the rated voltage of the filter capacitor can be reduced; and a problem can be solved that an air conditioner set shuts off due to excess voltage protection is mis-triggered due to excessive high voltage on two ends of the filter capacitor.
Description
Technical field
The present invention relates to a kind of protection of electronic device of air-conditioning, especially a kind of control method extending the flat wave capacitor life-span in convertible frequency air-conditioner.
Background technology
Frequency-conversion air-conditioning system because its energy-conserving and environment-protective, advantage that accuracy of temperature control is high, in being widely used in productions at present, living.Find in development experiments; convertible frequency air-conditioner with active PFC function is defrosting or is heating in oil return control; if do not shut down during cross valve commutation; the phenomenon that the voltage that there will be the flat wave capacitor two ends in convertible frequency air-conditioner sharply raised in cross valve commutation moment; even sometimes, this rated voltage of charging into magnitude of voltage and can exceed flat wave capacitor.This service life reduction of charging into voltage and can cause electric capacity, also can cause false triggering overvoltage protection fault sometimes, stops compressor operation that air-conditioner set is shut down.
At present, if accidentally there is overvoltage protection fault in experimentation, the method improving voltage protection value that adopts has solved more.This solution, although the problem that can solve false triggering overvoltage protection fault, can't resolve the problem raised at the voltage transient at cross valve commutation moment flat wave capacitor two ends, and thisly charges into the infringement of voltage to electric capacity, equally also cannot eliminate.
Summary of the invention
The object of the present invention is to provide a kind of control method of convertible frequency air-conditioner; avoid the voltage transient at air-conditioning flat wave capacitor two ends when cross valve commutates to raise infringement to electric capacity, also solve the overtension at electric capacity two ends and problem that false triggering overvoltage protection fault makes air-conditioner set shut down simultaneously.
The object of the invention is to be achieved through the following technical solutions: a kind of control method of convertible frequency air-conditioner, comprises the steps:
Step 1, judge whether cross valve will commutate;
If step 2 judges that cross valve is about to commutation, then perform following steps:
Step 201, closedown PFC function;
Step 202, the commutation of execution cross valve
Step 203, then open PFC function.
The moment of the cross valve commutation of convertible frequency air-conditioner, load diminishes, and energy storage inductor is mainly to flat wave capacitor charging in this case, and the voltage at flat wave capacitor two ends may raise instantaneously.Off-premises station main control unit can be MCU, before the instruction that cross valve commutates is sent to relay by it, first performs the instruction of closing PFC function.The PWM that the outer machine main control unit of conditioning chamber exports, control IGBT closes.Can judge whether PFC function closes by the voltage detected between IGBT grid and emitter stage.Perform cross valve commutation again, after predetermined time interval, off-premises station main control unit control IGBT opens.What produce when this design can avoid cross valve to commutate charges into the two ends that voltage is added in flat wave capacitor, reduces and is greater than the rated voltage of flat wave capacitor because charging into voltage and damages the risk of flat wave capacitor.
Further, in step 1, judging whether cross valve will commutate is judge whether off-premises station main control unit obtains air conditioner refrigerating and the conversion instruction heating state.
Further, in step 2, before cross valve commutation, close PFC function specifically: before the commutation of execution cross valve, off-premises station main control unit sends to driven compressor unit and closes PFC function command.
Further, whether off-premises station main control unit gathers the voltage between grid and emitter stage, close for detecting PFC function, if after step 201, detected that before step 202 PFC function is not closed, then gets back to step 201 and performs and close PFC function; If detect that PFC function is closed after step 201, before step 202, then perform the action of the cross valve commutation of step 202.
Further, off-premises station main control unit performs cross valve commutation instruction to relay power, for performing cross valve commutation.
Further, in step 2, after interrupting the scheduled time after off-premises station main control unit performs step 202, perform step 203 again.The PWM control IGBT that the adjustment of off-premises station main control unit exports opens.
The invention has the beneficial effects as follows: the present invention by adding the judgement of cross valve commutation in the control logic of off-premises station main control unit, with the switch of this control PFC function, thus when cross valve can be avoided to commutate produce charge into the two ends that voltage is added in flat wave capacitor, reduce and charge into voltage and be greater than the rated voltage of flat wave capacitor and damage the risk of flat wave capacitor, thus extend the service life of flat wave capacitor in convertible frequency air-conditioner.
Accompanying drawing explanation
Fig. 1 is a kind of flow chart of control method of convertible frequency air-conditioner;
Fig. 2 is a kind of block diagram extending the device in flat wave capacitor life-span in convertible frequency air-conditioner;
Fig. 3 is the block diagram of the device extending the flat wave capacitor life-span in convertible frequency air-conditioner in the specific embodiment of the invention;
Fig. 4 is the flow chart of the method extending the flat wave capacitor life-span in convertible frequency air-conditioner in the specific embodiment of the invention.
In figure:
1, cross valve 2, relay 3, off-premises station main control unit
4, driven compressor unit 41, rectification module 42, PFC module
43, flat wave capacitor 44, inversion module 5, compressor
Detailed description of the invention
Technical scheme of the present invention is further illustrated by detailed description of the invention below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of control method of convertible frequency air-conditioner, comprises the steps:
In step 1, judge whether cross valve 1 will commutate; Namely the instruction that whether free modulation cold-peace heats State Transferring is input to off-premises station main control unit 3;
The refrigeration of air-conditioning and the switching that heats state to be commutated realization by cross valve 1.When air-conditioning is in refrigerating state, relay 2 power-off, main slide valve moves to left under right side Compress Spring drives, and gases at high pressure enter right-hand member plunger shaft after entering capillary, on the other hand, the gas of left end plunger shaft is discharged, because piston two ends exist pressure reduction, piston and main slide valve move to left, and blast pipe is taken over off-premises station and communicates, another two adapters communicate, and form kind of refrigeration cycle; When air-conditioning be in heat state time, relay power, overcome the tension force of Compress Spring under the magneticaction that main slide valve produces at solenoid and move to right, gases at high pressure enter left end plunger shaft after entering capillary, on the other hand, the gas of right-hand member plunger shaft is discharged, because piston two ends exist pressure reduction, piston and main slide valve move to right, and blast pipe is taken over indoor set and communicates, another two adapters communicate, and are formed and heat circulation.
When artificial change refrigeration with when heating state, first indoor set main control unit acquires change the instruction of operational mode, and is transferred to off-premises station main control unit 3 by the mode such as connecting line or WiFi, ZigBee.
If step 2 judges that cross valve 1 is about to commutation, then perform following steps:
In step 201, PFC (PFC) function is closed;
As shown in Figure 2, driven compressor unit 4 comprises rectification module 41, PFC module 42, flat wave capacitor 43 and inversion module 44.As shown in Figure 3, PFC module 42 comprises energy storage inductor, IGBT and the resistance between the output being connected on rectification module 41.Wherein the colelctor electrode of IGBT is communicated with the node of energy storage inductor with flat wave capacitor 43, and emitter stage is connected to the other end of flat wave capacitor 43, and grid is connected to the output of off-premises station main control unit 3.
Off-premises station main control unit 3 output pwm signal drives IGBT to turn off, and makes energy storage inductor, flat wave capacitor 43 and resistance form a loop, filters out humorous wave interference by flat wave capacitor 43.
Whether off-premises station main control unit gathers the voltage between the grid of IGBT and emitter stage, close for detecting PFC function, if after step 201, detected that before step 202 PFC function is not closed, then gets back to step 201 and performs and close PFC function; If detect that PFC function is closed after step 201, before step 202, then the action that the cross valve 1 performing step 202 commutates.
In step 202., perform cross valve 1 to commutate;
Utilize sensor collecting work state and return to off-premises station main control unit 3, determining the running status that air-conditioning is current.If air-conditioning just works in refrigerating state, off-premises station main control unit 3 controls energising, overcome the tension force of Compress Spring under the magneticaction that main slide valve produces at solenoid and move to right, gases at high pressure enter left end plunger shaft after entering capillary, on the other hand, the gas of right-hand member plunger shaft is discharged, because piston two ends exist pressure reduction, piston and main slide valve move to right, and blast pipe is taken over indoor set and communicates, another two adapters communicate, and complete cross valve 1 and commutate.
If air-conditioning just works in the state of heating, off-premises station main control unit 3 controls power-off, main slide valve moves to left under right side Compress Spring drives, and gases at high pressure enter right-hand member plunger shaft after entering capillary, on the other hand, the gas of left end plunger shaft is discharged, because piston two ends exist pressure reduction, piston and main slide valve move to left, and blast pipe is taken over off-premises station and communicates, another two adapters communicate, and complete cross valve 1 and commutate.
In addition, cross valve 1 can also be increased to commutate detecting step.For guaranteeing that cross valve 1 commutates successfully, utilize the positional information of displacement transducer collect and process spring movement to feed back to off-premises station main control unit 3, the displacement characteristic comparison of displacement characteristic when being moved by the Compress Spring collected and standard is to determine whether cross valve 1 commutates successfully.
In step 203, PFC (PFC) function is then opened.
The pwm signal that off-premises station main control unit 3 adjustment exports drives IGBT to open, thus opens PFC function.
As shown in Figure 4, the detailed process for the control method extending the convertible frequency air-conditioner in convertible frequency air-conditioner flat wave capacitor life-span is as follows:
Off-premises station main control unit 3 judges whether cross valve 1 will commutate.Receive refrigeration with indoor set main control unit and heat the instruction of State Transferring and pass to off-premises station main control unit 3 for foundation by connecting line specifically; If off-premises station main control unit 3 receives State Transferring instruction, can think that cross valve 1 will commutate; If do not receive, then not think and need commutation, keep former duty.
If cross valve 1 will commutate, off-premises station main control unit 3 will send the instruction of closing PFC function to driven compressor unit 4.The pwm signal that adjustment off-premises station main control unit 3 exports to driven compressor unit 4.
If cross valve 1 is without the need to commutation, then off-premises station main control unit 3 performs other actions.
Driven compressor unit 4 performs instruction and closes PFC function.In driven compressor module, the grid of IGBT is electrically connected with off-premises station main control unit 3, can receive the pwm signal that it sends, and control IGBT opening or turning off.
Off-premises station main control unit 3 judges whether PFC function closes.Off-premises station main control unit 3 gathers the voltage between grid and emitter stage.If the voltage between grid and emitter stage is 0, then illustrate that IGBT is in off state, PFC function is closed; If not then PFC function is not closed.
Perform the action that cross valve 1 commutates.Example is switched to the state of heating with refrigeration, off-premises station main control unit 3 control relay 2 is energized, overcome the tension force of Compress Spring under the magneticaction that main slide valve produces at solenoid and move to right, gases at high pressure enter left end plunger shaft after entering capillary, on the other hand, the gas of right-hand member plunger shaft is discharged, because piston two ends exist pressure reduction, piston and main slide valve move to right, and blast pipe is taken over indoor set and communicates, another two adapters communicate, and are formed and heat circulation.
If PFC function is not closed, off-premises station main control unit 3 sends the instruction of closing PFC function to driven compressor unit 4.
Perform the action that cross valve 1 commutates, interrupt 3 ~ 7s, off-premises station main control unit 3 sends the instruction of opening PFC function to driven compressor unit 4.
Complete open the instruction of PFC function after, off-premises station main control unit 3 performs other actions, and continue judge whether cross valve 1 will turn to.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (6)
1. a control method for frequency conversion air conditioner, is characterized in that, comprises the steps:
Step 1, judge whether cross valve will commutate;
If step 2 judges that cross valve is about to commutation, then perform following steps:
Step 201, closedown PFC function;
Step 202, the commutation of execution cross valve
Step 203, then open PFC function.
2. control method for frequency conversion air conditioner according to claim 1, is characterized in that, in step 1, judging whether cross valve will commutate is judge whether off-premises station main control unit obtains air conditioner refrigerating and the conversion instruction heating state.
3. control method for frequency conversion air conditioner according to claim 1 and 2, it is characterized in that, in step 2, before cross valve commutation, close PFC function specifically: before the commutation of execution cross valve, off-premises station main control unit sends to driven compressor unit and closes PFC function command.
4. control method for frequency conversion air conditioner according to claim 3, it is characterized in that, off-premises station main control unit gathers the voltage between grid and emitter stage, whether close for detecting PFC function, if after the step 201, before step 202, detect that PFC function is not closed, then get back to step 201 and perform and close PFC function; If detect that PFC function is closed after step 201, before step 202, then perform the action of the cross valve commutation of step 202.
5. control method for frequency conversion air conditioner according to claim 1 and 2, is characterized in that, off-premises station main control unit performs cross valve commutation instruction to relay power, for performing cross valve commutation.
6. control method for frequency conversion air conditioner according to claim 5, is characterized in that, in step 2, again performs step 203 after interrupting the scheduled time after off-premises station main control unit performs step 202.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410527295.8A CN105571044A (en) | 2014-10-09 | 2014-10-09 | Control method for variable frequency air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410527295.8A CN105571044A (en) | 2014-10-09 | 2014-10-09 | Control method for variable frequency air conditioner |
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| CN105571044A true CN105571044A (en) | 2016-05-11 |
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| CN201410527295.8A Pending CN105571044A (en) | 2014-10-09 | 2014-10-09 | Control method for variable frequency air conditioner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110658380A (en) * | 2019-10-09 | 2020-01-07 | 广东美的制冷设备有限公司 | Power detection method and device, air conditioner and storage medium |
| CN111442471A (en) * | 2020-04-10 | 2020-07-24 | 广东美的制冷设备有限公司 | Air conditioner, control method and control device thereof, and computer readable storage medium |
| CN111854034A (en) * | 2020-06-10 | 2020-10-30 | 宁波奥克斯电气股份有限公司 | Air conditioner control method for preventing four-way valve from being blocked and air conditioner |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110658380A (en) * | 2019-10-09 | 2020-01-07 | 广东美的制冷设备有限公司 | Power detection method and device, air conditioner and storage medium |
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| CN111442471A (en) * | 2020-04-10 | 2020-07-24 | 广东美的制冷设备有限公司 | Air conditioner, control method and control device thereof, and computer readable storage medium |
| CN111854034A (en) * | 2020-06-10 | 2020-10-30 | 宁波奥克斯电气股份有限公司 | Air conditioner control method for preventing four-way valve from being blocked and air conditioner |
| CN111854034B (en) * | 2020-06-10 | 2022-01-25 | 宁波奥克斯电气股份有限公司 | Air conditioner control method for preventing four-way valve from being blocked and air conditioner |
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Application publication date: 20160511 |
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