CN202903913U - Fault detection device - Google Patents
Fault detection device Download PDFInfo
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- CN202903913U CN202903913U CN 201220500901 CN201220500901U CN202903913U CN 202903913 U CN202903913 U CN 202903913U CN 201220500901 CN201220500901 CN 201220500901 CN 201220500901 U CN201220500901 U CN 201220500901U CN 202903913 U CN202903913 U CN 202903913U
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Abstract
The utility model discloses a fault detection device applied to an air conditioning system. According to the utility model, a fault code detection circuit is connected with one phase in an alternating current power supply through a pressure switch of the air conditioning system, and sends a first direct current voltage signal which is used for judging whether the air conditioning system is abnormal to a main controller; three input ends of an outage detection circuit are respectively connected with three phases of an external power supply, and second and third direct current voltage signals are generated; second and third direct current voltage signals are respectively sent to the main controller, and the main controller judges whether the alternating current power supply is abnormal; and the main controller is powered by a switch power supply, determines that the air conditioning system is abnormal when detecting that a first direct current voltage signal is not a square wave signal, and determines that the air conditioning system has a fault based on that second and third direct current voltage signals determine that the alternating current power supply is normal. According to the utility model, a real fault code can be determined in the air conditioning system using the switch power supply, and incorrect fault judgments caused by the characteristics of the switch power supply system are excluded.
Description
Technical field
The utility model relates to air-conditioning technical, relates in particular to a kind of detection technique of air-conditioning system fault.
Background technology
All there is power supply in the air-conditioning system.Usually, air-conditioning system adopts linear power supply and Switching Power Supply to power.Air-conditioning system in the past adopts the linear power supply power supply mostly.The linear power supply principle is simple, stability is high.But, the shortcoming of linear power supply also clearly, such as the huge heaviness of volume of transformer, the volume of filter capacitor and capacity are also very huge, during larger electric current, power consumption is large and conversion efficiency is low in output.
Along with the development of technology, air-conditioning system integrated more and more higher, linear power supply is substituted by Switching Power Supply gradually.It is little lightweight that Switching Power Supply has volume, self strong interference immunity, the advantage such as output voltage range is wide, and modularization is strong, and efficient is high, and thermal value is little.
In the air-conditioning system of having used Switching Power Supply instead, because the characteristic of Switching Power Supply itself, air-conditioning system has following features:
After the outside of air-conditioning system had a power failure, because Switching Power Supply itself also can the supplying power for outside regular hour, the concrete time of supplying power for outside looked different Switching Power Supply and changes.That is to say, continue this following period of time of power supply in Switching Power Supply, central processing unit (CPU) will work on a period of time.In this time, because the air-conditioning system outside has a power failure, directly miscellaneous part moment of power supply quits work by external power source in the air-conditioning system.In this case, CPU can proceed to judge, and can with by communication power supply directly miscellaneous part out-of-work these actions of moment of power supply show as the failure code of machine abnormal running and process, although these actions belong to normal power failure and do not belong to failure code.
The above-mentioned processing of CPU can make the primary controller generation erroneous judgement in the air-conditioning system disconnected, may cause the judgement of whole air-conditioning system chaotic.
Therefore, exist in the prior art and can in the situation that the air-conditioning system normal power down, can not produce the needs of the technology of mistake fault detect to a kind of.
The utility model content
For overcoming defects, embodiment of the present utility model provides a kind of new circuit and control strategy, when the instantaneous power-off of realization in the air-conditioning system that adopts Switching Power Supply reaches long-time the power failure, failure code is distinguished, effective failure code is shown get rid of simultaneously because the mistake failure code that the switch power supply system characteristic is brought.
According to one side of the present utility model, a kind of failure detector for air-conditioning system is provided, comprise primary controller, failure code testing circuit and power failure detection circuit, described failure code testing circuit is connected to a phase in the communication power supply through the pressure switch of air-conditioning system, produce be used for judging air-conditioning system whether abnormal the first d. c. voltage signal and the first d. c. voltage signal is sent to the first input end of described primary controller; Three input ends of described power failure detection circuit are connected respectively to the three-phase of external power source and produce are used for judging whether communication power supply the second and the 3rd d. c. voltage signal of abnormity of power supply occurs, and described power failure detection circuit sends respectively the second and the 3rd d. c. voltage signal to the second and the 3rd input end of described primary controller and judges for primary controller whether communication power supply abnormity of power supply occurs; Described primary controller is powered by Switching Power Supply, determine that air-conditioning system is unusual when the first d. c. voltage signal is not square-wave signal detecting, and when determining that based on the described second and the 3rd d. c. voltage signal communication power supply does not have abnormal, determine that fault has occured air-conditioning system.
Wherein, when the generation air-conditioning system was unusual, the first d. c. voltage signal of described failure code testing circuit output was high level signal; When air-conditioning system worked, the first d. c. voltage signal of described failure code testing circuit output was square-wave signal.
In the described mistake failure detector, described failure code testing circuit comprises: be connected to a phase of communication power supply and the first terminal of described pressure switch; Bleeder circuit is connected to the first terminal; The first photoelectric isolating device, its input end are connected to bleeder circuit to receive the ac voltage signal of described bleeder circuit output; Be connected to the on-off circuit of the output terminal of the first photoelectric isolating device, be used for producing square-wave signal as the first d. c. voltage signal according to the ac voltage signal that is input to the first photoelectric isolating device, and without ac voltage signal the time, export the high-level DC voltage signal as the first d. c. voltage signal; Be connected to the second terminal of A.C. contactor, the second terminal and described pressure switch are connected in series, and are used for turn-offing when pressure switch is unusual communication power supply; Wherein, between described bleeder circuit and the first photoelectric isolating device, be connected in parallel to the first diode to prevent reverse breakdown the first photoelectric isolating device.
Wherein, being connected to a phase of communication power supply and the first terminal of Switching Power Supply comprises: with live wire first terminals of described communication power supply; The second and the 4th terminals that are connected with described pressure switch; The first terminals are connected with the second terminals, and the 4th terminals are connected with the 3rd terminals; With the 3rd terminals, be connected to an end of the first resistance in the described bleeder circuit;
Wherein, the other end of the first resistance in the first input end of the first photoelectric isolating device and the described bleeder circuit is connected, the second input end of the first photoelectric isolating device and an end of the second resistance in the described bleeder circuit are connected to the zero line of described communication power supply jointly, and the other end of the first resistance is connected to the other end of the second resistance;
The forward end of the first diode is connected to the second input end of the first photoelectric isolating device, and the backward end of the first diode is connected to the first input end of the first photoelectric isolating device;
Wherein, the second terminals of the second terminal are connected to the zero line of described communication power supply and the second input end of the first photoelectric isolating device, and being connected to the first terminals of the second terminal through relay, the first terminals of the second terminal are connected to the 3rd terminals of the first terminal through relay switch.
Further, described on-off circuit comprises: triode, its base stage is connected to the first output terminal of the first photoelectric isolating device and is connected to direct supply through the 4th resistance, the second output terminal common ground of emitter and the first photoelectric isolating device, collector is connected to described direct supply through the 5th resistance, and is connected to the output terminal of on-off circuit through the 6th resistance; The first capacitor, an end are connected between the 6th resistance and the described on-off circuit, other end ground connection.
Wherein, described power failure detection circuit comprises:
The first bleeder circuit, the one end is connected to the first-phase of communication power supply;
The second bleeder circuit, comprise the first reduction voltage circuit and second capacitor in parallel with the first reduction voltage circuit, one end of the second bleeder circuit is connected to the other end of the first bleeder circuit, and the other end is connected to the second-phase of communication power supply and the second input end of the second photoelectric isolating device;
The first mu balanced circuit, the one end is connected to the other end of the second bleeder circuit and the first bleeder circuit, and the other end is connected to the first input end of the second photoelectric isolating device;
The 3rd bleeder circuit, the one end is connected to the second-phase of communication power supply;
The 4th bleeder circuit, comprise the second reduction voltage circuit and three capacitor in parallel with the second reduction voltage circuit, one end of the 4th bleeder circuit is connected to the other end of the 3rd bleeder circuit, and the other end is connected to the third phase of communication power supply and the second input end of the 3rd photoelectric isolating device;
The second mu balanced circuit, the one end is connected to the other end of the 4th bleeder circuit and the 3rd bleeder circuit, and the other end is connected to the first input end of the 3rd photoelectric isolating device.
Wherein, the first output terminal of the second photoelectric isolating device is connected to the second input end of primary controller through the 7th resistance, and is connected to DC voltage through the 8th resistance; The second input end of primary controller and the 7th resistance are connected to an end of the 4th capacitor jointly, the second output head grounding of the other end of the 4th capacitor and the second photoelectric isolating device;
The first output terminal of the 3rd photoelectric isolating device is connected to the 3rd input end of the described primary controller of power failure detection circuit through the 9th resistance, and is connected to DC voltage through the tenth resistance; The 3rd input end of primary controller and the 9th resistance are connected to an end of the 5th capacitor, the second output head grounding of the other end of the May 4th capacitor and the 3rd photoelectric isolating device jointly.
Wherein, described communication power supply abnormal comprises: described communication power supply generation phase shortage; Described communication power supply generation anti-phase; Described communication power supply occurrence frequency is unusual; Described communication power supply cuts off the power supply.
Described primary controller is used for: when detecting the second d. c. voltage signal and the 3rd d. c. voltage signal and be high level signal, determine that described communication power supply cuts off the power supply; When detect the second d. c. voltage signal and the 3rd d. c. voltage signal one of them when the high level signal, determine described communication power supply generation phase shortage; When the second and the 3rd d. c. voltage signal is square-wave signal, and the phase differential between the second and the 3rd d. c. voltage signal and pre-stored predetermined phase in primary controller are poor when inconsistent, determine described communication power supply generation anti-phase; When the second and the 3rd d. c. voltage signal is square-wave signal, and the second and the 3rd d. c. voltage signal one of at least frequency and described primary controller in pre-stored preset frequency when inconsistent, determine that described communication power supply occurrence frequency is unusual.
Described failure detector further comprises: the outage types testing circuit is provided for judging that described communication power supply outage is instantaneous power-off or long-time the 4th d. c. voltage signal that has a power failure.
Wherein, described outage types testing circuit comprises:
The 11 resistance, the one end is connected to DC voltage;
The 12 resistance, the one end is connected to the four-input terminal of described primary controller;
The 6th capacitor, the one end is connected to the other end of described the 11 resistance and the other end of the 12 resistance, the other end ground connection of the 6th capacitor.
According to another aspect of the present utility model, a kind of fault detection method for air-conditioning system is provided, comprise step: according to the first d. c. voltage signal from the failure detector circuit output that is connected with one of communication power supply, it is unusual that primary controller determines whether that air-conditioning system has occured; When anomalous of air conditioner has occured, utilize the second and the 3rd d. c. voltage signal that comes from the power failure detection circuit output that is connected respectively with the three-phase of described communication power supply, it is unusual that described primary controller determines whether to occur described communication power supply; When determining not occur described communication power supply when unusual, described primary controller determines that fault has occured air-conditioning system.
Wherein, according to the first d. c. voltage signal from the failure detector circuit output that is connected with one of communication power supply, primary controller determines whether to have occured air-conditioning system and unusually comprises:
When the first d. c. voltage signal was square-wave signal, described primary controller determined that air-conditioning system is normal;
When the first d. c. voltage signal was high level signal, described primary controller determined that air-conditioning system is unusual.
Wherein, utilize the second and the 3rd d. c. voltage signal that comes from the power failure detection circuit output that is connected respectively with the three-phase of described communication power supply, described primary controller determines whether to occur described communication power supply and unusually comprises:
When the second d. c. voltage signal and the 3rd d. c. voltage signal are high level signal, determine that described communication power supply cuts off the power supply;
When one of them is high level signal when the second d. c. voltage signal and the 3rd d. c. voltage signal, determine described communication power supply generation phase shortage;
When the second and the 3rd d. c. voltage signal is square-wave signal, and the phase differential between the second and the 3rd d. c. voltage signal and pre-stored predetermined phase in primary controller are poor when inconsistent, determine described communication power supply generation anti-phase;
When the second and the 3rd d. c. voltage signal is square-wave signal, and the second and the 3rd d. c. voltage signal one of at least frequency and described primary controller in pre-stored preset frequency when inconsistent, determine that described communication power supply occurrence frequency is unusual.
When described primary controller is determined the AC power outage, described method also comprises: when powering on after the AC power outage occurs, described primary controller is according to the 4th d. c. voltage signal from the outage types testing circuit, and described primary controller determines that the AC power outage is momentary power failure or long-time outage.
Wherein, described primary controller determines that the AC power outage is that momentary power failure or long-time outage comprise:
If the 4th d. c. voltage signal is lower than first threshold, determine that the AC power outage is long-time outage;
If the 4th d. c. voltage signal is not less than first threshold, determine that the AC power outage is momentary power failure.
Described method further comprises: if it is unusual to determine that communication power supply has occured, primary controller determines that air-conditioning system does not break down, and removes fault flag, waits for that described communication power supply recovers normal.
The utility model can be determined real failure code in the air-conditioning system that adopts Switching Power Supply, get rid of because the mistake fault that the switch power supply system characteristic is brought is judged.
Description of drawings
Fig. 1 is the block scheme according to the failure detector of the utility model embodiment;
Fig. 2 is the schematic diagram according to the failure code testing circuit of the utility model embodiment;
Fig. 3 is the schematic diagram according to the power failure detection circuit of the utility model embodiment;
Fig. 4 is the schematic diagram according to the outage types testing circuit of the utility model embodiment;
Fig. 5 is the process flow diagram according to the fault detection method of the utility model embodiment;
Fig. 6 is according to the unusual process flow diagram of the judgement communication power supply of the embodiment of the invention.
As shown in the figure, in order clearly to realize the structure of embodiment of the present utility model, marked in the drawings specific structure and device, but this is only for signal needs, and is not that intention is limited to the utility model in described ad hoc structure, device and the environment.According to concrete needs, those of ordinary skill in the art can adjust these devices and structure or revise, and the adjustment of carrying out or modification still are included in the scope of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments failure detector and the method thereof that the utility model provides is described in detail.What simultaneously here do to illustrate is, more detailed in order to make embodiment, the following examples be the best, preferred embodiment, also can adopt other alternative and implements for some known technology those skilled in the art; And accompanying drawing part only is in order to describe more specifically embodiment, and is not intended to the utility model is carried out concrete restriction.
The utility model is contained any in substituting of making of marrow of the present utility model and scope, modification, equivalent method and scheme.For ease of understanding the utility model, in following the utility model preferred embodiment, describe concrete details in detail, and do not have for a person skilled in the art the description of these details also can understand the utility model fully.In addition, for fear of essence of the present utility model is caused unnecessary obscuring, do not describe well-known method, process, flow process, element and circuit etc. in detail.
Fig. 1 shows the block scheme according to the failure detector of the utility model embodiment.As shown in Figure 1, failure detector comprises primary controller 10, failure code testing circuit 20, power failure detection circuit 40 and outage types testing circuit 30.Primary controller 10 is by Switching Power Supply 50 power supplies, and operation is controlled to air-conditioning system.Failure code testing circuit 20 is connected to pressure switch and the externally fed power supply of air-conditioning system, and is connected with primary controller 10.In the air-conditioning system that has adopted Switching Power Supply, in the air-conditioning system, real fault refers to the fault of the refrigerant pressure anomaly initiation that all parts causes in the air-conditioning system.In the utility model because the real fault that the refrigerant pressure variation of air-conditioning system etc. cause and since the pseudo-fault that the air-conditioning system outage causes he to be referred to as air-conditioning system unusual.When air-conditioning system was normally moved, failure code testing circuit 20 output square-wave signals were to primary controller 10.When real fault occurs in air-conditioning system, cause pressure switch to be turn-offed, failure code detects the electric power road and no longer exports square-wave signal.On the other hand, when the communication power supply abnormal of air-conditioning system, during the situations such as that cross streams electricity phase shortage that connects such as failure code testing circuit 20 or outage, also can cause pressure switch to be turn-offed, thereby failure code testing circuit 20 is exported without the square wave signal.When primary controller 10 detected the first d. c. voltage signal that failure code testing circuit 20 sends and is not voltage square wave signal, it is unusual that primary controller 10 determines that air-conditioning system has occured.Power failure detection circuit 40 is connected to communication power supply and provides the second and the 3rd d. c. voltage signal to primary controller 10.During the communication power supply normal power supply, the second and the 3rd d. c. voltage signal is the DC voltage square-wave signal; When communication power supply was unusual, one in the second and the 3rd d. c. voltage signal may become high level signal.Power failure detection circuit 40 is unusual for detection of whether communication power supply occuring, and namely detects communication power supply whether power phase shortage, anti-phase or frequency anomaly or outage occur.Only have when outage occurs, the second and the 3rd d. c. voltage signal that the power failure detection circuit 40 that primary controller 10 receives sends is not square-wave signal.Alternatively, according to embodiment of the present utility model, failure detector can also comprise outage types testing circuit 30, is used for judging that outage is instantaneous power-off or long-time the power failure.
Fig. 2 shows the schematic diagram according to the failure code testing circuit of the utility model embodiment.As shown in Figure 2, failure code testing circuit 20 comprises the first and second terminals, bleeder circuit, the first photoelectric isolating device 201 and on-off circuit.Particularly, P2R, P2S connection terminal are connected respectively to live wire and the zero line of external power source.In other words, the failure code testing circuit only is connected to the phase in the three-phase supply.In the utility model, that is connected with pressure switch is U or W phase as shown in Figure 3 mutually.The VH type terminal that the first terminal PCN2(JST produces) is connected to the pressure switch of air-conditioning through its terminals 2 and 4.When catastrophic failure appearred in air-conditioning system, pressure switch at first can abnormal, and deenergization.The VH type terminal that the second terminals P CN3(JST produces) be connected to the A.C. contactor (not shown), and its link 3 is connected to connection terminal P2S.The terminals 3 of the first terminal PCN2 are connected to the terminals 1 of the second terminals P CN3 through relay switch FTR-F3, be connected to simultaneously the first input end of the first photoelectric isolating device 201 through the first resistance R 140.The first photoelectric isolating device 201 is used for the interchange of its input end and the output signal isolation of output terminal, and the AC signal of input end is changed into the DC voltage square-wave signal.The terminals 3 of the second terminals P CN3 are connected to its terminals 1 and relay switch FTR-F3 through relay SK1.Simultaneously, the terminals 3 of the second terminals P CN3 are also connected to the second input end of the first photoelectric isolating device.
The output terminal of the first photoelectric isolating device 201 is connected to on-off circuit.Particularly, the first output terminal of the first photoelectric isolating device 201 is connected to the base stage of triode Q50, and the emitter of triode Q50 is connected on the connection terminal 63H1 by the 3rd resistance R 161, and connection terminal 63H1 is connected to the primary controller first input end.When pressure switch was unusual, the failure code testing circuit sent look-at-me through this terminal to primary controller.The second output terminal of the first photoelectric isolating device and the emitter of triode Q50 be ground connection respectively.
Among Fig. 2, the body of A.C. contactor is installed on air-conditioning system forceful electric power electrical side, and its control winding is connected on the second terminals P CN3 by distribution.As shown in Figure 2, the second terminals P CN3 is connected with the A.C. contactor (not shown), and A.C. contactor is connected with pressure switch, turn-offs communication power supply by A.C. contactor hardware when pressure switch is unusual.
In the example of Fig. 2, the first input end of the first photoelectric isolating device is 1A, and the second input end is 1K, and the first output terminal is 1C, and the second output terminal is 1E.Utilize the characteristic of photoelectric isolating device, when input end signal was ac voltage signal, its output end signal was the direct current square-wave signal.
The failure code testing circuit also comprises: between the first resistance R 140 and the first photoelectric isolating device, and second resistance R 144 and diode D48 that between the first input end of the first photoelectric isolating device and the second input end, be connected in parallel.The second resistance R 144 and the first resistance R 140 form bleeder circuit, are used for the first photoelectric isolating device 201 forward conductions, and D48 is parallel to the first and second input ends of the first photoelectric isolating device to prevent reverse breakdown.
Further, the failure code testing circuit also comprises: the first output terminal of the first photoelectric isolating device also is connected on the 5V power supply via the 4th resistance R 156.The 4th R156 plays metering function when the output channel conducting of the first photoelectric isolating device.
In addition, in the failure code testing circuit 20, the collector of triode Q50 also via the 5th resistance R 157 be connected to+the 5V power supply on.In transistor switching circuit, 157 metering functions of the 5th resistance R.When the external pressure switch disconnected, forceful electric power side signal was input to weak-feedback side of transmission line by light-coupled isolation.Between the connection terminal 63H1 of the 6th resistance R 161 and on-off circuit, be connected with the first capacitor C92, the other end ground connection of the first capacitor.If the first photoelectric isolating device 201 does not have ac voltage signal input, then provide high level signal through resistance R 157 and the 6th resistance R 161 to primary controller 10 by+5v power supply.
AC power enters air switch from P2R through the connection terminal 1 and 2 of the first terminal, from connection terminal 4 and 3 outputs of air switch through the first terminal, returns terminal P2S after the first resistance R 140 and the second resistance R 144 again.Interchange voltage division signal on the second resistance R 144 is input to the first photoelectric isolating device 201.In response to exchanging voltage division signal, the first photoelectric isolating device is exported the first DC voltage square-wave signal.
When air-conditioning system worked, failure code testing circuit 20 output square-wave signals were to primary controller 10; When the air-conditioning system abnormal, no matter be the genuine system failure, or system cut-off or ac power supply are unusual, and pressure switch disconnects external power source, failure code testing circuit 20 forms open circuit, thereby failure code testing circuit 20 is no longer exported square-wave signal to primary controller 10.In this case, but only provide the high-voltage level signal to primary controller 10.
Fig. 3 shows the schematic diagram of the power failure detection circuit of embodiment of the present utility model.As shown in Figure 3, U, V, W terminal are connected respectively on the three-phase alternating-current supply.Simultaneously, the U terminal is connected to the first input end of the second photoelectric isolating device 401 by the first bleeder circuit and the first mu balanced circuit, wherein the first bleeder circuit comprises two resistance R 142, the R148 that is connected in series, the first mu balanced circuit comprises voltage stabilizing diode ZD11, the ZD13 of two Opposite direction connections, resistance R 148 is connected to the forward end of voltage stabilizing diode ZD11, and the forward end of stabilivolt ZD13 is connected with the second photoelectric isolating device.Voltage stabilizing diode ZD11 and ZD13 prevent that the second photoelectric isolating device is reversed puncture.The second bleeder circuit comprises reduction voltage circuit and the second capacitor C83 in parallel with this reduction voltage circuit.The second capacitor C83 is used for eliminating high frequency noise to be disturbed.The second capacitor C83 is used for eliminating high frequency noise to be disturbed.Reduction voltage circuit comprises two resistance R that are connected in series 149, R150.One end of the second bleeder circuit is connected to the first bleeder circuit and the first mu balanced circuit, and the other end is connected to the second input end of the second photoelectric isolating device and the V terminal that is connected with the V of communication power supply.
The V terminal is connected to the first input end of the 3rd photoelectric isolating device 402 by the 3rd bleeder circuit and the second mu balanced circuit.The 3rd bleeder circuit comprises two resistance R 143, the R147 that is connected in series, the second mu balanced circuit comprises voltage stabilizing diode ZD12, the ZD14 of two Opposite direction connections, resistance R 147 is connected to the forward end of voltage stabilizing diode ZD12, and the forward end of stabilivolt ZD14 is connected with the first input end of the 3rd photoelectric isolating device.Voltage stabilizing diode ZD12 and ZD14 are used for preventing that the 3rd photoelectric isolating device is reversed puncture.The 4th bleeder circuit comprises reduction voltage circuit and the three capacitor C84 in parallel with this reduction voltage circuit.The 3rd capacitor C84 is used for eliminating high frequency noise to be disturbed.The 3rd capacitor C84 is used for eliminating high frequency noise to be disturbed.Reduction voltage circuit comprises two resistance R that are connected in series 151, R152.One end of the 4th bleeder circuit is connected to the 3rd bleeder circuit and the second mu balanced circuit, and the other end is connected to the second input end of the 3rd photoelectric isolating device and the W terminal that is connected with the W of communication power supply
The first output terminal of the second photoelectric isolating device 401 is connected to connection terminal R-S by the 7th resistance R 164, and described connection terminal R-S connects the second input end of primary controller.The end that resistance R 164 is connected with the second photoelectric isolating device 401 also through the 8th resistance R 159 be connected to direct supply for example+the 5V DC voltage on, the other end of resistance R 164 connects the 4th capacitor C95 of ground connection.The first output terminal of the 3rd photoelectric isolating device is connected to connection terminal S-T by the 9th resistance R 163, and described connection terminal S-T connects the 3rd input end of primary controller.The end that resistance R 163 is connected with the 3rd photoelectric isolating device 401 also through the tenth resistance R 160 be connected to direct supply for example+the 5V DC voltage on, the other end of resistance R 163 connects the 5th capacitor C94 of ground connection.The second output terminal of the second photoelectric isolating device and the second output terminal of the 3rd photoelectric isolating device be ground connection respectively.Utilize the characteristic of photoelectric isolating device, when the input signal of the second and the 3rd photoelectric isolating device was respectively AC signal, the output signal of the second and the 3rd photoelectric isolating device also correspondingly was the direct current square-wave signal.
Referring to Fig. 3, ac voltage signal between the UV phase is after resistance R 142, R148, R149 and R150 dividing potential drop, the ac voltage signal of the dividing potential drop at resistance R 149 and R150 two ends is input to the second photoelectric isolating device, and output the second DC voltage square-wave signal is to primary controller 10 after the photoelectricity isolation processing of the second photoelectric isolating device.The frequency of the second direct current square-wave signal is consistent with the frequency of the ac voltage signal at resistance R 149 and R150 two ends, and the frequency of resistance R 149 and the ac voltage signal at R150 two ends is UV AC signal frequency mutually.Primary controller 10 according to the voltage square wave signal of input judge whether UV phase cuts off the power supply, whether the signal frequency of UV phase unusual.Equally, ac voltage signal between the VW phase is after resistance R 143, R147, R151 and R152 dividing potential drop, the ac voltage signal of the dividing potential drop at resistance R 151 and R152 two ends is input to the 3rd photoelectric isolating device, and output the 3rd DC voltage square-wave signal is to primary controller 10 after the photoelectricity isolation processing of the second electrical isolation device.The frequency of the 3rd direct current square-wave signal is consistent with the frequency of the ac voltage signal at resistance R 151 and R152 two ends, and the frequency of resistance R 151 and the ac voltage signal at R152 two ends is VW AC signal frequency mutually.
Primary controller 10 according to second of input judge with the 3rd DC voltage square-wave signal whether UV cuts off the power supply mutually with VW mutually, whether the UV phase unusual with VW signal frequency mutually.If cut off the power supply, then all do not have the second and the 3rd DC voltage square-wave signal, namely on terminals R-S and the S-T all without the square wave signal, but high level signal is only arranged.If the generation abnormity of power supply, for example when phase shortage, one of the second and the 3rd DC voltage square-wave signal will lack, and namely one of terminals R-S and S-T are upper without the square wave signal, and high level signal is only arranged.If it is unusual that supply frequency occurs, then the frequency of at least one in the second and the 3rd DC voltage square-wave signal can abnormal.Particularly, primary controller 10 inside are provided with frequency detection module, be used for to determine to compare from the frequency of the second and the 3rd DC voltage square-wave signal of wiring R-S and S-T input and the frequency that will detect and pre-stored preset frequency, if the two is consistent, then determine not have frequency anomaly, otherwise occurrence frequency is unusual.If the power supply anti-phase occurs, then the phase differential between the second and the 3rd DC voltage square-wave signal can change.Particularly, primary controller 10 also comprises phase detecting module, is used for the phase differential between definite UV phase and the VW phase.Primary controller 10 compares the determined phase differential of phase detecting module and the phase differential that sets in advance, if the two is inconsistent, then determines to have occured anti-phase.If when U or W phase shortage occured, then power failure detection circuit can not exported the second or the 3rd output voltage signal again; If V phase phase shortage is the same with the generation outage, there is not the second or the 3rd output voltage signal.
Alternatively, failure detector of the present utility model can comprise the outage types testing circuit.Fig. 4 shows the schematic diagram according to the outage types testing circuit of the utility model embodiment.As shown in Figure 4, in the outage types testing circuit, resistance R 36 is connected to the A/D terminals after being connected in series with resistance R 38, the other end of resistance R 36 be connected to direct supply for example+the 5V DC voltage on.Resistance R 36 and R38 are connected to capacitor C16 jointly, the other end ground connection of capacitor C16.
If externally fed power supply instantaneous power-off occurs, namely power off time is less than 500ms, and capacitor C16 can not fully discharge so, and the output voltage of A/D terminals is 2.5V-4V, namely is higher than predetermined voltage threshold; If long-time the power failure occurs, namely power off time is greater than 500ms, and then the output voltage of A/D terminals is lower than described predetermined voltage threshold.In example shown in Figure 4, predetermined voltage threshold is 2.5V.Each time after external power source has a power failure and powers on, the signal that primary controller 10 will receive according to its A/D terminal with and inner pre-stored predetermined voltage threshold, judging has a power failure is instantaneous power-off or long-time the power failure.
The below describes the specific works process of fault detection system of the present utility model in detail.
As shown in Figure 5, flow process originates in step 510.In step 510, primary controller is finished the initial work that each parts of air-conditioning system are controlled.In step 511, the signal that primary controller 10 receives from failure code testing circuit 20 and power failure detection circuit 40.Alternatively, primary controller 10 is gone back the signal that further receives from outage types testing circuit 30 in step 511.In step 512, it is unusual that primary controller 10 judges whether that according to the first d. c. voltage signal from failure code testing circuit 20 air-conditioning system occurs.As previously mentioned, if air-conditioning system abnormal not real fault does not occur or real AC power outage, phase shortage etc. do not occur unusual such as air-conditioning system, the first d. c. voltage signal is square-wave signal so; If air-conditioning system abnormal, so owing to pressure switch when air-conditioning system is unusual can be turn-offed, the first photoisolator of failure code testing circuit no longer receives AC signal, so the first d. c. voltage signal of failure code testing circuit output is high level signal.When the first d. c. voltage signal was square-wave signal, it is unusual that primary controller 10 determines that air-conditioning system does not occur; When the first d. c. voltage signal was high level signal, it is unusual that primary controller 10 determines that air-conditioning system occurs.If primary controller 10 is determined not break down, then flow process turns back to step 511, continues the operation of air-conditioning system is monitored.
After primary controller 10 determined that according to the signal that receives from failure code testing circuit 20 the generation air-conditioning system is unusual, primary controller 10 further judged whether to occur communication power supply unusual (step 513) according to the second and the 3rd d. c. voltage signal that receives from power failure detection circuit.If it is unusual that primary controller 10 determines that communication power supply does not occur, then primary controller 10 determines that air-conditioning system fault has occured, the fault handling (step 514) that primary controller 10 will be scheduled to.
If it is unusual that primary controller 10 determines that communication power supply occurs, primary controller determines that air-conditioning system does not break down, and removes fault flag, waits for that described communication power supply recovers normal (step 515).Particularly, primary controller judges whether to occur communication power supply and unusually comprises and judge whether communication power supply the situations such as phase shortage, anti-phase, frequency anomaly and outage occur.The judgement of the outage of communication power supply, phase shortage, anti-phase and frequency anomaly as previously mentioned.If it is unusual that communication power supply occurs, in step 515, primary controller 10 is also to user report abnormity of power supply information, for example phase shortage information, anti-phase information and frequency anomaly information.
Alternatively, when occuring in the unusual situation of communication power supply, after step 515, if the communication power supply recovery, primary controller 10 is further determined power cut-off type (step 516) according to the 4th d. c. voltage signal.If the 4th DC voltage from the outage types testing circuit is lower than first threshold, for example be lower than 2.5V, primary controller 10 determines that power cut-off is long-time outage; If not, then be defined as momentary power failure.If be defined as momentary power failure, primary controller 10 does not reset initial value to all parts of air-conditioning system, and flow process directly turns back to step 511.If determining outage types is long-time outage, primary controller 10 carries out initial value setting (step 517) to all parts of air-conditioning system again, and flow process turns back to step 511.
Fig. 6 shows according to the unusual detailed process of the judgement communication power supply of the utility model embodiment.As shown in Figure 6, in step 610, primary controller 10 judges whether the second d. c. voltage signal and the 3rd d. c. voltage signal are high level signal, if so, determines that then described communication power supply cuts off the power supply, and flow process proceeds to step 515.If not, in step 611, primary controller 10 is judged the second d. c. voltage signal and the 3rd d. c. voltage signal, and whether one of them is high level signal, if it is determines described communication power supply generation phase shortage, flow process proceeds to step 515.At this moment, can determine that the second and the 3rd d. c. voltage signal is square-wave signal.If power phase shortage does not occur, in step 612, primary controller 10 judges whether the phase differential between the second and the 3rd d. c. voltage signal is poor consistent with pre-stored predetermined phase in primary controller, if not, determine described communication power supply generation anti-phase, then flow process proceeds to step 515.If anti-phase does not occur, in step 613, primary controller 10 judge second with the 3rd d. c. voltage signal frequency one of at least and described primary controller in pre-stored preset frequency whether consistent, if inconsistent, determine that described communication power supply occurrence frequency is unusual, flow process proceeds to step 515.If consistent, then show the communication power supply frequency anomaly does not occur, flow process proceeds to step 514.The frequency of communication power supply is generally 50 or 60Hz, so preset frequency is 50 or 60Hz.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, described program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
According to the utility model, in the air-conditioning system that adopts Switching Power Supply, when the generation air-conditioning system is unusual, can determine whether to occur the situations such as AC power outage, phase shortage, anti-phase and frequency anomaly according to the second and the 3rd d. c. voltage signal of the power failure detection circuit output that is connected with three of communication power supply, thereby it is unusual to determine whether that communication power supply occurs, thereby determine that the air-conditioning system that occurs is not real air-conditioning system fault unusually when the generation AC power is unusual, has got rid of because the mistake fault that the switch power supply system characteristic is brought is judged.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. a failure detector that is used for air-conditioning system comprises primary controller, failure code testing circuit and power failure detection circuit, it is characterized in that:
Described failure code testing circuit is connected to a phase in the communication power supply through the pressure switch of air-conditioning system, produce be used for judging air-conditioning system whether abnormal the first d. c. voltage signal and the first d. c. voltage signal is sent to the first input end of described primary controller;
Three input ends of described power failure detection circuit are connected respectively to the three-phase of external power source and produce are used for judging whether communication power supply the second and the 3rd d. c. voltage signal of abnormity of power supply occurs, and described power failure detection circuit sends respectively the second and the 3rd d. c. voltage signal to the second and the 3rd input end of described primary controller and judges for primary controller whether communication power supply abnormity of power supply occurs;
Described primary controller is powered by Switching Power Supply, determine that air-conditioning system is unusual when the first d. c. voltage signal is not square-wave signal detecting, and when determining that based on the described second and the 3rd d. c. voltage signal communication power supply does not have abnormal, determine that fault has occured air-conditioning system.
2. mistake according to claim 1 failure detector, wherein, described failure code testing circuit comprises:
Be connected to a phase of communication power supply and the first terminal of described pressure switch;
Bleeder circuit is connected to the first terminal;
The first photoelectric isolating device, its input end are connected to bleeder circuit to receive the ac voltage signal of described bleeder circuit output;
Be connected to the on-off circuit of the output terminal of the first photoelectric isolating device, be used for producing square-wave signal as the first d. c. voltage signal according to the ac voltage signal that is input to the first photoelectric isolating device, and without ac voltage signal the time, export the high-level DC voltage signal as the first d. c. voltage signal;
Be connected to the second terminal of A.C. contactor, the second terminal and described pressure switch are connected in series, and are used for turn-offing when pressure switch is unusual communication power supply;
Wherein, between described bleeder circuit and the first photoelectric isolating device, be connected in parallel to the first diode to prevent reverse breakdown the first photoelectric isolating device.
3. failure detector as claimed in claim 2 wherein, is connected to a phase of communication power supply and the first terminal of Switching Power Supply and comprises: with live wire first terminals of described communication power supply; The second and the 4th terminals that are connected with described pressure switch; The first terminals are connected with the second terminals, and the 4th terminals are connected with the 3rd terminals; With the 3rd terminals, be connected to an end of the first resistance in the described bleeder circuit;
Wherein, the other end of the first resistance in the first input end of the first photoelectric isolating device and the described bleeder circuit is connected, the second input end of the first photoelectric isolating device and an end of the second resistance in the described bleeder circuit are connected to the zero line of described communication power supply jointly, and the other end of the first resistance is connected to the other end of the second resistance;
The forward end of the first diode is connected to the second input end of the first photoelectric isolating device, and the backward end of the first diode is connected to the first input end of the first photoelectric isolating device;
Wherein, the second terminals of the second terminal are connected to the zero line of described communication power supply and the second input end of the first photoelectric isolating device, and being connected to the first terminals of the second terminal through relay, the first terminals of the second terminal are connected to the 3rd terminals of the first terminal through relay switch.
4. failure detector according to claim 3, wherein, described on-off circuit comprises:
Triode, its base stage is connected to the first output terminal of the first photoelectric isolating device and is connected to direct supply through the 4th resistance, the second output terminal common ground of emitter and the first photoelectric isolating device, collector is connected to described direct supply through the 5th resistance, and is connected to the output terminal of on-off circuit through the 6th resistance;
The first capacitor, an end are connected between the 6th resistance and the described on-off circuit, other end ground connection.
5. failure detector according to claim 1, wherein, described power failure detection circuit comprises:
The first bleeder circuit, the one end is connected to the first-phase of communication power supply;
The second bleeder circuit, comprise the first reduction voltage circuit and second capacitor in parallel with the first reduction voltage circuit, one end of the second bleeder circuit is connected to the other end of the first bleeder circuit, and the other end is connected to the second-phase of communication power supply and the second input end of the second photoelectric isolating device;
The first mu balanced circuit, the one end is connected to the other end of the second bleeder circuit and the first bleeder circuit, and the other end is connected to the first input end of the second photoelectric isolating device;
The 3rd bleeder circuit, the one end is connected to the second-phase of communication power supply;
The 4th bleeder circuit, comprise the second reduction voltage circuit and three capacitor in parallel with the second reduction voltage circuit, one end of the 4th bleeder circuit is connected to the other end of the 3rd bleeder circuit, and the other end is connected to the third phase of communication power supply and the second input end of the 3rd photoelectric isolating device;
The second mu balanced circuit, the one end is connected to the other end of the 4th bleeder circuit and the 3rd bleeder circuit, and the other end is connected to the first input end of the 3rd photoelectric isolating device.
6. failure detector according to claim 5, wherein, the first output terminal of the second photoelectric isolating device is connected to the second input end of primary controller through the 7th resistance, and is connected to DC voltage through the 8th resistance; The second input end of primary controller and the 7th resistance are connected to an end of the 4th capacitor jointly, the second output head grounding of the other end of the 4th capacitor and the second photoelectric isolating device;
The first output terminal of the 3rd photoelectric isolating device is connected to the 3rd input end of the described primary controller of power failure detection circuit through the 9th resistance, and is connected to DC voltage through the tenth resistance; The 3rd input end of primary controller and the 9th resistance are connected to an end of the 5th capacitor jointly, the second output head grounding of the other end of the 5th capacitor and the 3rd photoelectric isolating device.
7. failure detector as claimed in claim 1 further comprises:
The outage types testing circuit is provided for judging that described communication power supply outage is instantaneous power-off or long-time the 4th d. c. voltage signal that has a power failure.
8. failure detector as claimed in claim 7, wherein, described outage types testing circuit comprises:
The 11 resistance, the one end is connected to DC voltage;
The 12 resistance, the one end is connected to the four-input terminal of described primary controller;
The 6th capacitor, the one end is connected to the other end of described the 11 resistance and the other end of the 12 resistance, the other end ground connection of the 6th capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220500901 CN202903913U (en) | 2012-09-27 | 2012-09-27 | Fault detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220500901 CN202903913U (en) | 2012-09-27 | 2012-09-27 | Fault detection device |
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| Publication Number | Publication Date |
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| CN202903913U true CN202903913U (en) | 2013-04-24 |
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| CN 201220500901 Expired - Lifetime CN202903913U (en) | 2012-09-27 | 2012-09-27 | Fault detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890210A (en) * | 2012-09-27 | 2013-01-23 | 青岛海信日立空调系统有限公司 | Fault detection device and method |
| CN112986794A (en) * | 2021-01-25 | 2021-06-18 | 中国电子科技集团公司第二十九研究所 | Pulse matching load fault detection circuit and method |
-
2012
- 2012-09-27 CN CN 201220500901 patent/CN202903913U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890210A (en) * | 2012-09-27 | 2013-01-23 | 青岛海信日立空调系统有限公司 | Fault detection device and method |
| CN102890210B (en) * | 2012-09-27 | 2015-05-13 | 青岛海信日立空调系统有限公司 | Fault detection device and method |
| CN112986794A (en) * | 2021-01-25 | 2021-06-18 | 中国电子科技集团公司第二十九研究所 | Pulse matching load fault detection circuit and method |
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