CN108254675A - Pfc circuit failure detector, method and convertible frequency air-conditioner - Google Patents
Pfc circuit failure detector, method and convertible frequency air-conditioner Download PDFInfo
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- CN108254675A CN108254675A CN201810211530.9A CN201810211530A CN108254675A CN 108254675 A CN108254675 A CN 108254675A CN 201810211530 A CN201810211530 A CN 201810211530A CN 108254675 A CN108254675 A CN 108254675A
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- pfc
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2843—In-circuit-testing
Abstract
The present invention provides a kind of pfc circuit failure detector, method and convertible frequency air-conditioners；Wherein, the pfc circuit failure detector includes：Circuit signal detection unit for the signal of sample detecting circuit output, obtains multiple physical quantitys of pfc circuit；And malfunction identifying unit, for judging the pfc circuit malfunction according to pfc circuit fault verification rule；Wherein, the multiple physical quantity includes：DC bus-bar voltage Udc, input ac voltage peak value Uacpeak, PFC unit branch current I and pfc circuit total current IAlways.Pfc circuit failure detector provided by the invention, method and convertible frequency air-conditioner realize the detection to two-way pfc circuit malfunction in parallel, processing, ensure that the reliability service of air-conditioning.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of pfc circuit failure detector, method and frequency conversion are empty
It adjusts.
Background technology
In the case where vigorously advocating energy-efficient situation now, convertible frequency air-conditioner, which substitutes fixed frequency air conditioner, becomes present and following air conditioner industry
Development trend.
Interleaved parallel PFC circuit used by existing convertible frequency air-conditioner, if in use, first device in pfc circuit
Part (such as inductance, diode, switching tube) damages, and entire pfc circuit can be made to be in abnormality and can not work normally,
Influence the normal use of air-conditioning.
It is typically artificially to be detected in specific maintenance for existing interleaved parallel PFC circuit, labor intensive, into
This is higher, can not in time, effectively, simply and easily detect failure, also can not after failure appearance in time, effective processing event
Barrier, and PFC is caused to work in the problem of abnormal, it not yet proposes to efficiently solve scheme at present.
Invention content
In view of this, the present invention is directed to propose a kind of pfc circuit failure detector, method and convertible frequency air-conditioner, realization pair
Detection, the processing of two-way pfc circuit malfunction in parallel, ensure that air-conditioning is in reliability service state.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of pfc circuit failure detector, including：Circuit signal detection unit, for sample detecting circuit output
Signal obtains multiple physical quantitys of pfc circuit；And malfunction identifying unit, for according to pfc circuit fault verification rule
Judge the pfc circuit malfunction；Wherein, the multiple physical quantity includes：DC bus-bar voltage Udc, input ac voltage peak
Value Uacpeak, PFC unit branch current I and pfc circuit total current IAlways。
Further, by the DC bus-bar voltage U of the pfc circuitdcWith input ac voltage peak value UacpeakIt determines
Whether pfc circuit has boosting；By the PFC units branch current I, the pfc circuit total current I of the pfc circuitAlwaysIt determines
The relationship of parallel branch electric current and total current；So as to judge the pfc circuit malfunction.
Further, the pfc circuit includes PFC unit branch A and PFC unit branches B, the PFC units branch electricity
Stream I is PFC unit branch A electric currents IAAnd/or PFC unit branch B electric currents IB。
Further, the pfc circuit fault verification rule is as follows：If continue to detect U in a predetermined timedc＜
(Uacpeak+ΔUPFC fault verification voltage values), then it is determined as the equal failures of PFC unit branch A and PFC unit branch B；If continue a pre- timing
It is interior to detect IAlways＞ (2*I+ Δs IPFC fault verification current values), then it is determined as PFC unit branch A failures；If continue in a predetermined time
Detect IAlways＜ (2*I- Δs IPFC fault verification current values), then it is determined as PFC unit branch B failures；If being unsatisfactory for above, it is determined as
PFC unit branch A and PFC unit branches B is normal；Wherein, Δ UPFC fault verification voltage valuesRepresent the abnormal decision threshold of pfc circuit boosting
Value；ΔIPFC fault verification current valuesRepresent the decision threshold of pfc circuit branch current exception.
Further, the pfc circuit failure detector further includes：Fault processing unit, for according to PFC electricity
Road malfunction performs troubleshooting according to a default processing mode.
Further, the default processing mode is specific as follows：If it is determined that two PFC units branch PFC unit branch A and
PFC unit branches B is normal, then allows the maximum power P of operationmax=PIt is specified；If it is determined that two PFC unit branches at least its
One of failure, then allow operation maximum power Pmax＜ PIt is specified。
A kind of pfc circuit fault detection method, including：The signal of sample detecting circuit output obtains the multiple of pfc circuit
Physical quantity；And judge the pfc circuit malfunction according to pfc circuit fault verification rule；Wherein, the multiple physical quantity
Including：DC bus-bar voltage Udc, input ac voltage peak value Uacpeak, PFC unit branch current I and pfc circuit total current IAlways.
Further, by the DC bus-bar voltage U of the pfc circuitdcWith input ac voltage peak value UacpeakIt determines
Whether pfc circuit has boosting；By the PFC units branch current I, the pfc circuit total current I of the pfc circuitAlwaysIt determines
The relationship of parallel branch electric current and total current；So as to judge the pfc circuit malfunction.
Further, the pfc circuit includes PFC unit branch A and PFC unit branches B, the PFC units branch electricity
Stream I is PFC unit branch A electric currents IAAnd/or PFC unit branch B electric currents IB。
Further, the pfc circuit fault verification rule is as follows：If continue to detect U in a predetermined timedc＜
(Uacpeak+ΔUPFC fault verification voltage values), then it is determined as the equal failures of PFC unit branch A and PFC unit branch B；If continue a pre- timing
It is interior to detect IAlways＞ (2*I+ Δs IPFC fault verification current values), then it is determined as PFC unit branch A failures；If continue in a predetermined time
Detect IAlways＜ (2*I- Δs IPFC fault verification current values), then it is determined as PFC unit branch B failures；If being unsatisfactory for above, it is determined as
PFC unit branch A and PFC unit branches B is normal；Wherein, Δ UPFC fault verification voltage valuesRepresent the abnormal decision threshold of pfc circuit boosting
Value；ΔIPFC fault verification current valuesRepresent the decision threshold of pfc circuit branch current exception.
Further, the pfc circuit fault detection method further includes：According to the pfc circuit malfunction, according to one
Default processing mode performs troubleshooting.
Further, the default processing mode is specific as follows：If it is determined that two PFC units branch PFC unit branch A and
PFC unit branches B is normal, then allows the maximum power P of operationmax=PIt is specified；If it is determined that two PFC unit branches at least its
One of failure, then allow operation maximum power Pmax＜ PIt is specified。
A kind of convertible frequency air-conditioner, including the pfc circuit failure detector.
A kind of convertible frequency air-conditioner uses the pfc circuit fault detection method to perform pfc circuit fault detect.
Relative to the prior art, pfc circuit failure detector of the present invention, method and convertible frequency air-conditioner have following
Advantage：
(1) detection device and method of the present invention are simple, by DC bus-bar voltage Udc, input ac voltage peak value Uacpeak、
PFC unit branch current I and pfc circuit total current IAlwaysIt can accurately judge failure, the circuit physical amount of required sampling is few, holds
It easily obtains, without increasing additional detection circuit.
(2) detection device and method of the present invention are effective, by pfc circuit boosting and parallel branch current relationship, have
Effect determines PFC each unit branch trouble states.
(3) present invention performs corresponding troubleshooting, in pfc circuit failure space-time according to pfc circuit malfunction
Volume operation is downgraded, ensure that air-conditioning is reliably run.
Description of the drawings
The attached drawing for forming the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the interleaved parallel PFC circuit topology figure that convertible frequency air-conditioner of the embodiment of the present invention uses.
Fig. 2 is pfc circuit failure detector block diagram of the embodiment of the present invention.
Fig. 3 is pfc circuit fault detection method flow chart of the embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
To realize detection, processing to interleaved parallel PFC fault state, ensure that convertible frequency air-conditioner is in reliability service shape
State, the present invention propose a kind of interleaved parallel PFC circuit fault detecting apparatus and method.As shown in Figure 1, what convertible frequency air-conditioner used
Interleaved parallel PFC (Power Factor Correction, PFC) circuit is mono- using two basic Boost PFC
Member is composed, and each PFC unit switch is operated under crisscross parallel state.Two basic Boost PFC units are denoted as respectively
PFC unit branch A and PFC unit branches B.
In one embodiment, as shown in Fig. 2, the pfc circuit failure detector includes：Circuit signal detection is single
Member, malfunction identifying unit and fault processing unit.
Further, it please refers to shown in attached drawing 1-2, the circuit signal detection unit, for passing through sample detecting circuit
The signal of output, detection obtain following four physical quantity, DC bus-bar voltage Udc, input ac voltage peak value Uacpeak, PFC it is mono-
First branch A electric currents IA(and/or PFC unit branch B electric currents IB), pfc circuit total current IAlways.Wherein, two PFC unit branches are adopted
Sample any of which branch current, herein with sample rate current IAFor illustrate.
The malfunction identifying unit, for according to pfc circuit fault verification rule, being obtained by the judgement of above-mentioned physical quantity
Pfc circuit malfunction.
Specifically, starting to judge after PFC openings 10s, the pfc circuit fault verification rule is specific as follows：
If continuing 5s detects Udc＜ (Uacpeak+ΔUPFC fault verification voltage values), determining pfc circuit, (boosting is different without boosting
Often), then it is determined as two equal failures of PFC unit branches；
If continuing 5s detects IAlways＞ (2*IA+ΔIPFC fault verification current values), it determines parallel branch current anomaly, is then determined as
PFC unit branch A failures；
If continuing 5s detects IAlways＜ (2*IA-ΔIPFC fault verification current values), it determines parallel branch current anomaly, is then determined as
PFC unit branch B failures；
If being unsatisfactory for above, it is determined as that two PFC unit branches are normal.
The present invention effectively determines PFC each unit branches by pfc circuit boosting and parallel branch current relationship
Malfunction.
In above-mentioned decision rule, Δ UPFC fault verification voltage valuesRepresent whether pfc circuit has the decision threshold of boosting, according to
The boosting of pfc circuit minimum is typically set to more than 20V, Δ UPFC fault verification voltage valuesUsually desirable 10V.ΔIPFC fault verification current valuesRepresent PFC electricity
The decision threshold of road branch current exception is Δ within 0.5A according to the equal stream error that PFC branch currents are commonly designed
IPFC fault verification current valuesUsually desirable 2A.
The present invention is by DC bus-bar voltage U as a result,dc, input ac voltage peak value Uacpeak, PFC unit branch current I and
Pfc circuit total current IAlwaysIt can accurately judge failure, the circuit physical amount of required sampling is few, easily obtains, without increasing volume
Outer detection circuit.
The fault processing unit, for according to pfc circuit malfunction, being performed according to a default processing mode corresponding
Troubleshooting ensures that air-conditioning is reliably run.
The default processing mode is specific as follows：
If it is determined that two PFC unit branches are normal, then allow the maximum power P of operationmax=PIt is specified；
If it is determined that at least one failure of two PFC unit branches, then allow the maximum power P runmax＜ PIt is specified。
Specifically, if it is determined that two equal failures of PFC unit branches, then allow the maximum power P runmax=1/4*PIt is specified；If it is determined that
PFC unit branch A failures, PFC unit branches B is normal, then allows the maximum power of operation；If it is determined that PFC unit branch B events
Barrier, PFC unit branches A is normal, then allows the maximum power P of operationmax=1/2*PIt is specified。
Pfc circuit failure detector proposed by the present invention, it is simple in structure, convenient for detecting failure, be conducive to air-conditioning just
Often operating.
In another specific embodiment, as shown in figure 3, the pfc circuit fault detection method, includes the following steps：
Step 1：PFC is opened, starts to detect.
Step 2：Live signal samples following four physical quantity, DC bus-bar voltage Udc, input ac voltage peak value
Uacpeak, PFC unit branch A electric currents IA, pfc circuit total current IAlways.Wherein, two PFC units branch sampling any of which branches
Electric current, herein with sample rate current IAFor illustrate.
Step 3：After waiting for PFC openings 10s, start to be judged according to PFC fault verification rules.
Step 4：Whether judgement pfc circuit has boosting, if continuing 5s detects Udc＜ (Uacpeak+Δ
UPFC fault verification voltage values), then it is assumed that pfc circuit is determined as two equal failures of PFC unit branches without boosting.
Step 5：Judge whether PFC unit branch A electric currents are normal, if continuing 5s detects IAlways＞ (2*IA+Δ
IPFC fault verification current values), then it is assumed that PFC unit branch A electric currents are abnormal, that is, are determined as PFC unit branch A failures.
Step 6：Judge whether PFC unit branch B electric currents are normal, if continuing 5s detects IAlways＜ (2*IA-Δ
IPFC fault verification current values), then it is assumed that PFC unit branch B electric currents are abnormal, that is, are determined as PFC unit branch B failures.
Step 7：If three above decision condition is unsatisfactory for, it is determined as that two PFC unit branches are normal.
In above-mentioned decision rule, Δ UPFc fault verification voltage valuesRepresent whether pfc circuit has the decision threshold of boosting, according to
The boosting of pfc circuit minimum is typically set to more than 20V, Δ UPFC fault verification voltage valuesUsually desirable 10V.ΔIPFC fault verification current valuesRepresent PFC electricity
The decision threshold of road branch current exception is Δ within 0.5A according to the equal stream error that PFC branch currents are commonly designed
IPFC fault verification current valuesUsually desirable 2A.
Step 8：According to pfc circuit malfunction, corresponding troubleshooting is performed according to a default processing mode, is ensured empty
Adjust reliable operation.
The default processing mode is specific as follows：
If it is determined that two PFC unit branches are normal, then allow the maximum power P of operationmax=PIt is specified；
If it is determined that at least one failure of two PFC unit branches, then allow the maximum power P runmax＜ PIt is specified。
Specifically, if it is determined that two equal failures of PFC unit branches, then allow the maximum power P runmax=1/4*PIt is specified；If it is determined that
PFC unit branch A failures, PFC unit branches B is normal, then allows the maximum power P of operationmax=1/2*PIt is specified；If it is determined that PFC
Unit branch B failures, PFC unit branches A is normal, then allows the maximum power P of operationmax=1/2*PIt is specified。
It should be noted that in the equal failure of two PFC unit branches of judgement, allow the maximum power of operation can be unlimited
It is made as Pmax=1/4*PIt is specified；When judging a wherein PFC unit branch troubles, allow the maximum power of operation can be not limited to
Pmax=1/2*PIt is specified, meet Pmax＜ PIt is specified.
The present invention is by DC bus-bar voltage U as a result,dc, input ac voltage peak value Uacpeak, PFC unit branch current I and
Pfc circuit total current IAlwaysIt can accurately judge failure, the circuit physical amount of required sampling is few, easily obtains, without increasing volume
Outer detection circuit, detection method are simple.
In addition, the present invention also provides a kind of convertible frequency air-conditioner, including above-mentioned pfc circuit failure detector.
The present invention also provides a kind of computer equipments, including memory, processor and are stored on the memory simultaneously
The computer program that can be run on the processor, the processor realize the PFC when performing the computer program
Fault detection method.
The present invention also provides a kind of computer readable storage mediums, are stored thereon with computer program, the computer
The pfc circuit fault detection method is realized when program is executed by processor.
In above-described embodiment, when those skilled in the art can continue the detection in judgement time started, decision process
Between wait the appropriate adjustment of carry out, do not influence the realization of the present invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (14)
1. a kind of pfc circuit failure detector, which is characterized in that including：
Circuit signal detection unit for the signal of sample detecting circuit output, obtains multiple physical quantitys of pfc circuit；And
Malfunction identifying unit, for judging the pfc circuit malfunction according to pfc circuit fault verification rule；
Wherein, the multiple physical quantity includes：DC bus-bar voltage Udc, input ac voltage peak value Uacpeak, PFC unit branches
Electric current I and pfc circuit total current IAlways。
2. pfc circuit failure detector according to claim 1, which is characterized in that by the direct current of the pfc circuit
Busbar voltage UdcWith input ac voltage peak value UacpeakDetermine whether pfc circuit has boosting；By the institute of the pfc circuit
State PFC unit branch currents I, pfc circuit total current IAlwaysDetermine the relationship of parallel branch electric current and total current；It is described so as to judge
Pfc circuit malfunction.
3. pfc circuit failure detector according to claim 2, which is characterized in that the pfc circuit includes PFC units
Branch A and PFC unit branch B, the PFC units branch current I are PFC unit branch A electric currents IAAnd/or PFC unit branches B
Electric current IB。
4. pfc circuit failure detector according to claim 3, which is characterized in that the pfc circuit fault verification rule
It is as follows：
If continue to detect U in a predetermined timedc＜ (Uacpeak+ΔUPFC fault verification voltage values), then be determined as PFC unit branch A and
The equal failures of PFC unit branch B；
If continue to detect I in a predetermined timeAlways＞ (2*I+ Δs IPFC fault verification current values), then it is determined as PFC unit branch A failures；
If continue to detect I in a predetermined timeAlways＜ (2*I- Δs IPFC fault verification current values), then it is determined as PFC unit branch B failures；
If being unsatisfactory for above, it is determined as that PFC unit branch A and PFC unit branches B is normal；
Wherein, Δ UPFC fault verification voltage valuesRepresent the abnormal decision threshold of pfc circuit boosting；ΔIPFC fault verification current valuesRepresent pfc circuit branch
The decision threshold of road current anomaly.
5. pfc circuit failure detector according to claim 1, which is characterized in that further include：Fault processing unit is used
According to the pfc circuit malfunction, troubleshooting is performed according to a default processing mode.
6. pfc circuit failure detector according to claim 5, which is characterized in that the default processing mode is specifically such as
Under：
If it is determined that two PFC unit branch PFC unit branch A and PFC unit branches B are normal, then allow the maximum work of operation
Rate Pmax=PIt is specified；
If it is determined that at least one failure of two PFC unit branches, then allow the maximum power P runmax＜ PIt is specified。
7. a kind of pfc circuit fault detection method, which is characterized in that including：
The signal of sample detecting circuit output obtains multiple physical quantitys of pfc circuit；And
Judge the pfc circuit malfunction according to pfc circuit fault verification rule；
Wherein, the multiple physical quantity includes：DC bus-bar voltage Udc, input ac voltage peak value Uacpeak, PFC unit branches
Electric current I and pfc circuit total current IAlways。
8. pfc circuit fault detection method according to claim 7, which is characterized in that by the direct current of the pfc circuit
Busbar voltage UdcWith input ac voltage peak value UacpeakDetermine whether pfc circuit has boosting；By the institute of the pfc circuit
State PFC unit branch currents I, pfc circuit total current IAlwaysDetermine the relationship of parallel branch electric current and total current；It is described so as to judge
Pfc circuit malfunction.
9. pfc circuit fault detection method according to claim 8, which is characterized in that the pfc circuit includes PFC units
Branch A and PFC unit branch B, the PFC units branch current I are PFC unit branch A electric currents IAAnd/or PFC unit branches B
Electric current IB。
10. pfc circuit fault detection method according to claim 9, which is characterized in that the pfc circuit fault verification rule
It is then as follows：
If continue to detect U in a predetermined timedc＜ (Uacpeak+ΔUPFC fault verification voltage values), then be determined as PFC unit branch A and
The equal failures of PFC unit branch B；
If continue to detect I in a predetermined timeAlways＞ (2*I+ Δs IPFC fault verification current values), then it is determined as PFC unit branch A failures；
If continue to detect I in a predetermined timeAlways＜ (2*I- Δs IPFC fault verification current values), then it is determined as PFC unit branch B failures；
If being unsatisfactory for above, it is determined as that PFC unit branch A and PFC unit branches B is normal；
Wherein, Δ UPFC fault verification voltage valuesRepresent the abnormal decision threshold of pfc circuit boosting；ΔIPFC fault verification current valuesRepresent pfc circuit branch
The decision threshold of road current anomaly.
11. pfc circuit fault detection method according to claim 7, which is characterized in that further include：According to the pfc circuit
Malfunction performs troubleshooting according to a default processing mode.
12. the pfc circuit fault detection method according to claim 11, which is characterized in that the default processing mode is specific
It is as follows：
If it is determined that two PFC unit branch PFC unit branch A and PFC unit branches B are normal, then allow the maximum work of operation
Rate Pmax=PIt is specified；
If it is determined that at least one failure of two PFC unit branches, then allow the maximum power P runmax＜ PIt is specified。
13. a kind of convertible frequency air-conditioner, which is characterized in that including pfc circuit failure inspection such as according to any one of claims 1 to 6
Survey device.
14. a kind of convertible frequency air-conditioner, which is characterized in that using the pfc circuit failure inspection as described in any one of claim 7 to 12
Survey method performs pfc circuit fault detect.
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| CN112303865A (en) * | 2020-11-24 | 2021-02-02 | 珠海格力电器股份有限公司 | Air conditioner fault-tolerant circuit, air conditioning unit and control method |
| CN112524853A (en) * | 2020-12-09 | 2021-03-19 | 青岛海尔空调器有限总公司 | Control method of compressor in variable frequency air conditioner and variable frequency air conditioner |
| CN112688551A (en) * | 2020-12-02 | 2021-04-20 | 青岛海尔空调电子有限公司 | Interleaved PFC circuit failure control method, system and device |
| CN112688550A (en) * | 2020-11-20 | 2021-04-20 | 青岛海尔空调电子有限公司 | Method, system and device for judging failure of interleaved PFC circuit |
| CN113394963A (en) * | 2020-03-11 | 2021-09-14 | 上海海立（集团）股份有限公司 | PFC circuit detection method and device and readable storage medium |
| CN114325306A (en) * | 2021-12-03 | 2022-04-12 | 广东友电新能源科技有限公司 | Method and device for detecting connectivity of inverter system, electronic equipment and medium |
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