CN106403142A - Abnormal power-off protection method of VRV air-conditioning system indoor unit - Google Patents
Abnormal power-off protection method of VRV air-conditioning system indoor unit Download PDFInfo
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- CN106403142A CN106403142A CN201510462039.XA CN201510462039A CN106403142A CN 106403142 A CN106403142 A CN 106403142A CN 201510462039 A CN201510462039 A CN 201510462039A CN 106403142 A CN106403142 A CN 106403142A
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Abstract
The invention discloses an abnormal power-off protection method of a VRV air-conditioning system indoor unit. The abnormal power-off protection method of the VRV air-conditioning system indoor unit comprises the following steps that (1) whether a zero cross signal exists or not at present is judged, and if not, the duration time without a zero cross signal is judged; (2) whether the duration time without a zero cross signal exceeds a preset threshold value t1 or not is judged, if yes, the current operation mode of an air conditioner is judged, and an electronic expansion valve is controlled to a corresponding position according to the operation mode; and in the step (1) if an indoor unit single-chip microcomputer does not detect a zero cross signal, a power supply circuit of the indoor unit single-chip microcomputer is automatically switched to an energy storage circuit to supply power. According to the abnormal power-off protection method of the VRV air-conditioning system indoor unit, the indoor unit single-chip microcomputer judges an abnormal power-off phenomenon of the indoor unit by detecting the zero cross signal, the opening degree of the electronic expansion valve is adjusted and controlled according to the current operation mode of the air conditioner, refrigerant backflow is prevented, and an insufficient evaporation phenomenon is prevented. The arrangement of the energy storage circuit is the premise for guaranteeing that the indoor unit single-chip microcomputer can work when power is off.
Description
Technical field
The invention belongs to air-conditioning technical field, specifically, it is to be related to a kind of multi-online air-conditioning system indoor set abnormal power-down guard method.
Background technology
Get more and more with the interior board number that multi-gang air-conditioner unit can connect, assembly environment also becomes increasingly complex, especially it is assemblied in the air-conditioning of office building, because the power supply of each interior machine is by each owner's independent control, the arbitrary electric situation of partly interior machine coverlet therefore regular can occur；Multiple on-line system partly interior machine power-off, the problem bringing maximum is that electric expansion valve state does not know, if electric expansion valve is in the state opened, now coolant directly flows back to outdoor pusher side, causes to evaporate insufficient, leads to that system oil return is abnormal, liquid hammer risk.
Multi-online air-conditioning system is in order to solve this problem now; increased off-premises station and connect indoor board number lock function; need to lock total number of units of interior machine during off-premises station debugging; during unit runs well; the situation that in appearance, machine is lost or increased; certain time, whole unit will stopping alarm, which has the drawback that worst for Consumer's Experience.
Another settling mode is the mode that indoor set increases a set of back-up source, when interior machine plate is detected and not having electricity completely, starts back-up source, then executes the action of shutdown, the method for air conditioning unit increase back-up source, high cost first, installs complicated；Once other back-up source power supply goes wrong, air conditioning unit equally exist damage risk.
Content of the invention
The present invention in order to solve the problems, such as existing multi-gang air-conditioner unit tackle abnormal power-down when poor user experience or hardware cost high it is proposed that a kind of multi-online air-conditioning system indoor set abnormal power-down guard method, can solve the above problems.
In order to solve above-mentioned technical problem, the present invention employs the following technical solutions and is achieved：
A kind of multi-online air-conditioning system indoor set abnormal power-down guard method, comprises the following steps：
（1）, indoor set single-chip microcomputer persistently detect zero cross signal, judge currently whether there is zero cross signal, if no zero cross signal, judge the no zero cross signal persistent period；
（2）, judge the no zero cross signal persistent period whether exceed predetermined threshold value t1, if so, then judge air-conditioning current operating mode, and according to operation mode control electric expansion valve to corresponding position；
Described step（1）In, if indoor set single-chip microcomputer is not detected by zero cross signal, namely current indoor machine is in abnormal power-down state, and the current supply circuit of described indoor set single-chip microcomputer automatically switches to energy storage circuit and powers for it.
Further, described step（2）In, described air-conditioning current operating mode includes refrigeration mode and heating mode, when judging current operating mode for refrigeration mode, indoor set single-chip microcomputer stops all control end outputs, control electric expansion valve to standby reference position of freezing simultaneously, when judging current operating mode for heating mode, indoor set single-chip microcomputer stops all control end outputs, controls electric expansion valve to heating standby reference position simultaneously.
Further, described step（2）In, described air-conditioning current operating mode also includes shutdown mode, and when judging current operating mode for shutdown mode, indoor set single-chip microcomputer stops all control end outputs, controls electric expansion valve to shutdown mode reference position simultaneously.
Further, the current supply circuit of described indoor set single-chip microcomputer includes D/D change-over circuit and energy storage circuit, when indoor set normal power supply, described current supply circuit switches to described D/D change-over circuit and powers for described indoor set single-chip microcomputer, when indoor set abnormal power-down, described current supply circuit switches to described energy storage circuit and powers for described indoor set single-chip microcomputer, described D/D change-over circuit indoors machine normal power supply when charge for described energy storage circuit.
Further, the current supply circuit of described indoor set single-chip microcomputer also includes a relay, the control end of described relay is connected with the DC power output end of D/D change-over circuit, the normally opened contact of described relay is connected with the DC power output end of described D/D change-over circuit, the normally-closed contact of described relay is connected with the DC power output end of described energy storage circuit, and the movable contact of described relay is connected with the power end of described indoor set single-chip microcomputer.
Further, described energy storage circuit includes a super capacitor, and the positive pole of described super capacitor is connected with the DC power output end of described D/D change-over circuit by a charging resistor.
Further, it is also associated with a diode between the DC power output end of the positive pole of described super capacitor and described D/D change-over circuit, the positive pole of described diode is connected with the DC power output end of described D/D change-over circuit, and the negative pole of described diode is connected with the positive pole of described super capacitor.
Compared with prior art, advantages of the present invention and good effect are：The multi-online air-conditioning system indoor set abnormal power-down guard method of the present invention; indoor set single-chip microcomputer judges indoor set abnormal power-down by way of detecting zero cross signal; judgment mode is accurate; when determining abnormal power-down; control the aperture of electric expansion valve according to current operation of air conditioner mode tuning; to prevent refrigerant return, prevent from evaporating insufficient phenomenon, anti-locking system oil return exception, reduces liquid hammer risk simultaneously.This method is passed through to arrange energy storage circuit; power for indoor set single-chip microcomputer when current indoor machine is in abnormal power-down state; related protection control action can normally be executed with a period of time after guarantee indoors machine abnormal power-down, be that indoor set single-chip microcomputer can be in the premise of power-off work.
After the detailed description of embodiment of the present invention is read in conjunction with the accompanying, the other features and advantages of the invention will become clearer from.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing of required use in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of flow chart of embodiment of multi-online air-conditioning system indoor set abnormal power-down guard method proposed by the invention；
Fig. 2 is the switching circuit schematic diagram of current supply circuit in a kind of embodiment of multi-online air-conditioning system indoor set abnormal power-down guard method proposed by the invention；
Fig. 3 is the circuit theory diagrams of energy storage circuit in a kind of embodiment of multi-online air-conditioning system indoor set abnormal power-down guard method proposed by the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, broadly fall into the scope of protection of the invention.
Embodiment one, the present embodiment proposes a kind of multi-online air-conditioning system indoor set abnormal power-down guard method, shown in Figure 1, comprises the following steps：
S1, indoor set single-chip microcomputer persistently detect zero cross signal, judge currently whether there is zero cross signal, if no zero cross signal, judge the no zero cross signal persistent period；
Whether S2, judgement no zero cross signal persistent period exceed predetermined threshold value t1, if so, then judge air-conditioning current operating mode, and control electric expansion valve to corresponding position according to operation mode；
In described step S1, if indoor set single-chip microcomputer is not detected by zero cross signal, namely current indoor machine is in abnormal power-down state, and the current supply circuit of described indoor set single-chip microcomputer automatically switches to energy storage circuit and powers for it.
The multi-online air-conditioning system indoor set abnormal power-down guard method of the present embodiment; indoor set single-chip microcomputer judges indoor set abnormal power-down by way of detecting zero cross signal; judgment mode is accurate; when determining abnormal power-down; control the aperture of electric expansion valve according to current operation of air conditioner mode tuning; to prevent refrigerant return, prevent from evaporating insufficient phenomenon, anti-locking system oil return exception, reduces liquid hammer risk simultaneously.This method is passed through to arrange energy storage circuit; power for indoor set single-chip microcomputer when current indoor machine is in abnormal power-down state; associated safety protection control action can normally be executed with a period of time after guarantee indoors machine abnormal power-down, be that indoor set single-chip microcomputer can be in the premise of power-off work.Energy storage circuit is integrated in the part on the circuit board of indoor set, and circuit structure is simple, builds low cost, and stability is high,
As a preferred embodiment, because the reference position of operation mode its electric expansion valve of difference of air-conditioning is also different, therefore, in described step S2, the aperture of corresponding electric expansion valve should be adjusted according to current operating mode, described air-conditioning current operating mode at least includes refrigeration mode and heating mode, when judging current operating mode for refrigeration mode, indoor set single-chip microcomputer stops all control end outputs, simultaneously control electric expansion valve arrive refrigeration standby reference position N1, when judging current operating mode for heating mode, indoor set single-chip microcomputer stops all control end outputs, control electric expansion valve to heating standby reference position N2 simultaneously.Indoor set single-chip microcomputer can be within the very short time of power-off; under the electric power of energy storage circuit supports; accurately control and stop all control end outputs; and electric expansion valve is adjusted to safe reference position; greatly multi-online air-conditioning system can be protected, prevent in certain or some indoor set abnormal power-down, the aperture of the electric expansion valve of this indoor set does not know to lead to refrigerant return to lead to evaporate insufficient problem to outdoor pusher side; and system oil return can be prevented abnormal, reduce liquid hammer risk.Avoid an indoor set in prior art in this method and occur extremely, the mode of the single solution for diverse problems that whole multi-online air-conditioning system shuts down, the safety of whole multi-online air-conditioning system can be ensured, and do not affected the normal operation of other indoor sets, improve Consumer's Experience effect.
Although zero passage detection has been applied in air conditioner, but its testing goal is to solve other technical problems, in this method by way of carrying out zero passage detection, the disconnected situation of confession of the external power source of indoor set can be judged in time, and the shake of power supply can be identified by way of judging no zero cross signal persistent period in step 2 and whether exceeding predetermined threshold value t1, if recovering normal power supply in the time range of predetermined threshold value t1, then it is not judged as abnormal power-down, therefore do not execute the safeguard protection action of correlation yet, improve its detection sensitivity, prevent erroneous judgement and lead to misoperation.
In order that this method is more comprehensive, if preventing current air conditioning mode from being power-off under shutdown mode, lead to indoor set single-chip microcomputer cannot judge currently how to control the technical problem of electric expansion valve, in described step S2, described air-conditioning current operating mode also includes shutdown mode, when judging current operating mode for shutdown mode, indoor set single-chip microcomputer stops the output of all control ends, controls electric expansion valve to shutdown mode reference position N3 simultaneously.
As a preferred embodiment, the current supply circuit of described indoor set single-chip microcomputer includes D/D change-over circuit and energy storage circuit, when indoor set normal power supply, described current supply circuit switches to described D/D change-over circuit and powers for described indoor set single-chip microcomputer, taking the present embodiment as a example, D/D change-over circuit can provide the DC source of 12V for indoor set single-chip microcomputer, when indoor set abnormal power-down, described current supply circuit switches to described energy storage circuit and powers for described indoor set single-chip microcomputer, described D/D change-over circuit indoors machine normal power supply when charge for described energy storage circuit, the device of energy storage circuit is simple, take up room little, and low cost, because the situation of indoor set abnormal power-down is not common, therefore, the cost of the protection device that this method reduces while guarantee multi-online air-conditioning system is safe.
As shown in Figure 2，Once due to conventional indoor set single-chip microcomputer power-off，Will be unable to normal work，Electric power loop in order to ensure indoor set single-chip microcomputer can switch to energy storage circuit in time in outside power cut-off，Normally executed with the protection control action that guarantee indoor set single-chip microcomputer is follow-up，The current supply circuit of described indoor set single-chip microcomputer also includes a relay RL3，The control end 2 of described relay RL3 is connected with the DC power output end+12V of D/D change-over circuit，The normally opened contact 5 of described relay RL3 is connected with the DC power output end+12V of described D/D change-over circuit，The normally-closed contact 4 of described relay RL3 is connected with the DC power output end+12V1 of described energy storage circuit，The movable contact 3 of described relay RL3 is connected with the power end DC12V of described indoor set single-chip microcomputer，When the external power source of indoor set connects normally，The DC power output end of D/D change-over circuit exports the unidirectional current of+12V，The normally opened contact 5 of relay RL3 and movable contact 3 turn on，Therefore powered for indoor set single-chip microcomputer by D/D change-over circuit，When the external power source power-off of indoor set，The normally opened contact 5 of relay RL3 disconnects，Normally-closed contact 4 is turned on movable contact 3，Powered for indoor set single-chip microcomputer by energy storage circuit，Realize automatic switchover under outside on/off state for the electric power loop，Ensure indoor set single-chip microcomputer uninterrupted power supply.
As shown in Figure 3, described energy storage circuit includes a super capacitor E15, the positive pole of described super capacitor E15 is connected with the DC power output end+12V of described D/D change-over circuit by charging resistor R118, for when indoor set has external power source input, D/D change-over circuit can charge for super capacitor E15 simultaneously.
Input when there is no external power source, during super capacitor E15 electric discharge work, in order to prevent super capacitor E15 to be discharged in D/D change-over circuit, damage circuit devcie, it is also associated with a diode D27 between the DC power output end+12V of the positive pole of described super capacitor E15 and described D/D change-over circuit, the positive pole of described diode D27 is connected with the DC power output end+12V of described D/D change-over circuit, and the negative pole of described diode D27 is connected with the positive pole of described super capacitor E15.
Certainly; described above is not limitation of the present invention; the present invention is also not limited to the example above, change, remodeling, interpolation or replacement that those skilled in the art are made in the essential scope of the present invention, also should belong to protection scope of the present invention.
Claims (7)
1. a kind of multi-online air-conditioning system indoor set abnormal power-down guard method is it is characterised in that comprise the following steps：
（1）, indoor set single-chip microcomputer persistently detect zero cross signal, judge currently whether there is zero cross signal, if no zero cross signal, judge the no zero cross signal persistent period；
（2）, judge the no zero cross signal persistent period whether exceed predetermined threshold value t1, if so, then judge air-conditioning current operating mode, and according to operation mode control electric expansion valve to corresponding position；
Described step（1）In, if indoor set single-chip microcomputer is not detected by zero cross signal, namely current indoor machine is in abnormal power-down state, and the current supply circuit of described indoor set single-chip microcomputer automatically switches to energy storage circuit and powers for it.
2. multi-online air-conditioning system indoor set abnormal power-down guard method according to claim 1 is it is characterised in that described step（2）In, described air-conditioning current operating mode includes refrigeration mode and heating mode, and when judging current operating mode for refrigeration mode, indoor set single-chip microcomputer stops all control end outputs, controls electric expansion valve to standby reference position of freezing simultaneously,
When judging current operating mode for heating mode, indoor set single-chip microcomputer stops all control end outputs, controls electric expansion valve to heating standby reference position simultaneously.
3. multi-online air-conditioning system indoor set abnormal power-down guard method according to claim 2 is it is characterised in that described step（2）In, described air-conditioning current operating mode also includes shutdown mode, and when judging current operating mode for shutdown mode, indoor set single-chip microcomputer stops all control end outputs, controls electric expansion valve to shutdown mode reference position simultaneously.
4. the multi-online air-conditioning system indoor set abnormal power-down guard method according to any one of claim 1-3; it is characterized in that; the current supply circuit of described indoor set single-chip microcomputer includes D/D change-over circuit and energy storage circuit; when indoor set normal power supply; described current supply circuit switches to described D/D change-over circuit and powers for described indoor set single-chip microcomputer; when indoor set abnormal power-down; described current supply circuit switches to described energy storage circuit and powers for described indoor set single-chip microcomputer, described D/D change-over circuit indoors machine normal power supply when charge for described energy storage circuit.
5. multi-online air-conditioning system indoor set abnormal power-down guard method according to claim 4; it is characterized in that; the current supply circuit of described indoor set single-chip microcomputer also includes a relay; the control end of described relay is connected with the DC power output end of D/D change-over circuit; the normally opened contact of described relay is connected with the DC power output end of described D/D change-over circuit; the normally-closed contact of described relay is connected with the DC power output end of described energy storage circuit, and the movable contact of described relay is connected with the power end of described indoor set single-chip microcomputer.
6. multi-online air-conditioning system indoor set abnormal power-down guard method according to claim 5; it is characterized in that; described energy storage circuit includes a super capacitor, and the positive pole of described super capacitor is connected with the DC power output end of described D/D change-over circuit by a charging resistor.
7. multi-online air-conditioning system indoor set abnormal power-down guard method according to claim 6; it is characterized in that; it is also associated with a diode between the DC power output end of the positive pole of described super capacitor and described D/D change-over circuit; the positive pole of described diode is connected with the DC power output end of described D/D change-over circuit, and the negative pole of described diode is connected with the positive pole of described super capacitor.
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| CN115451612B (en) * | 2022-08-23 | 2024-02-23 | 青岛海尔空调电子有限公司 | Method and device for oil return of drying system, drying system and storage medium |
| CN115950047A (en) * | 2023-01-03 | 2023-04-11 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner control method and device, multi-split air conditioner and readable storage medium |
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