CN111082651A - Circuit and method for diagnosing, correcting and recovering PFC bus abnormity - Google Patents
Circuit and method for diagnosing, correcting and recovering PFC bus abnormity Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002159 abnormal effect Effects 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 235000008429 bread Nutrition 0.000 claims abstract description 20
- 238000007499 fusion processing Methods 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000003745 diagnosis Methods 0.000 claims abstract description 15
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 3
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 3
- 239000004065 semiconductor Substances 0.000 claims abstract description 3
- 230000005856 abnormality Effects 0.000 claims description 37
- 230000006872 improvement Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a diagnosis and correction recovery circuit for PFC bus abnormity, wherein alternating-current side voltage is boosted through a Boost circuit after passing through a rectifier bridge, sampling steamed bread waves generated after rectification are detected through a steamed bread wave detection circuit, bus voltage after boosting is detected through a bus voltage detection circuit, a driving circuit drives an MOS (metal oxide semiconductor) tube of the Boost circuit to be turned on and off, an information fusion processing module judges a voltage feedback signal of the sampling steamed bread waves and a voltage feedback signal of the bus voltage to determine whether the bus voltage is abnormal, when the bus voltage is determined to be abnormal due to the abnormal work of the Boost circuit, the information fusion processing module sends a signal to a feedback compensation correction module, and the feedback compensation correction module performs parameter compensation in positive and negative directions. The invention also provides a diagnosis and correction recovery method for the PFC bus abnormity. The fault diagnosis can be carried out when the bus voltage is abnormal, and the parameter compensation correction recovery can be automatically realized aiming at the problem of inductance parameter drift.
Description
Technical Field
The invention relates to a diagnosis and correction recovery circuit and a method, in particular to a diagnosis and correction recovery circuit and a method for PFC bus abnormity.
Background
A PFC (power factor correction) power converter belongs to a high-order part of a rectifying circuit, and the technology is used as a middle core link of a variable-frequency air conditioning system, so that the improvement of current harmonic waves at an alternating current side, the improvement of a power factor and the increase of direct-current bus voltage can be realized, and the driving capability is improved. The input voltage of the alternating current side and the control condition of the Boost converter are strongly related to the voltage of a bus, and the abnormal bus can directly cause the abnormal work of the frequency conversion system. In the prior art, the specific reason that the system cannot diagnose the problem when the bus voltage fluctuates in a short time and a large amplitude manner to cause the abnormality is solved, so that certain difficulty is brought to abnormal repair. Besides, the drift of the PFC inductance parameter caused by the aging of the air conditioner is also a common problem.
Disclosure of Invention
In view of this, the invention provides a PFC bus abnormality diagnosis and correction recovery circuit and method, which can perform fault diagnosis when a bus voltage abnormality occurs, and automatically implement parameter compensation correction recovery for an inductance parameter drift problem.
The invention provides a diagnosis and correction recovery circuit for PFC bus abnormality, which comprises: the device comprises a rectifier bridge, a Boost circuit, a steamed bread wave Um detection circuit, a bus voltage UO detection circuit, a current detection circuit, a driving circuit, an information fusion processing module and a feedback compensation correction module;
the alternating-current side voltage Us is boosted through the Boost circuit after passing through the rectifier bridge, a sampling steamed bread wave Um generated after rectification is detected through the steamed bread wave Um detection circuit, the boosted bus voltage Uo is detected through the bus voltage Uo detection circuit, the driving circuit drives an MOS (metal oxide semiconductor) tube Q in the Boost circuit to be turned on and off, the information fusion processing module judges an output voltage feedback signal of the sampling steamed bread wave Um and a voltage feedback signal of the bus voltage Uo to determine whether the bus voltage Uo is abnormal or not, when the abnormality caused by the abnormal work of the Boost circuit is determined, the information fusion processing module sends a signal to the feedback compensation correction module, and the feedback compensation correction module performs parameter compensation in positive and negative directions.
As a further improvement of the present invention, the information fusion processing module determines whether the bus voltage Uo is abnormal according to a signal output by the bus voltage Uo detection circuit, and when the bus voltage Uo is abnormal, the information fusion processing module determines the level of the ac side voltage Us according to a peak value of the sampling clock wave Um, and further determines whether the bus voltage Uo is abnormal due to the ac side voltage Us exceeding a threshold range.
As a further improvement of the present invention, if the bus voltage Uo is lower than the lowest threshold value to cause an abnormality, it is directly determined that the ac side voltage Us is too low, and if the bus voltage Uo is higher than the highest threshold value to cause an abnormality, it is further determined whether the ac side voltage Us is too high.
As a further improvement of the present invention, if the ac side voltage Us is within the threshold range, it is determined that the bus voltage Uo is abnormal due to abnormal operation of the Boost circuit, and at this time, the feedback compensation correction module performs parameter compensation in both positive and negative directions by using an inductance L parameter in the Boost circuit as a correction control parameter.
As a further improvement of the present invention, when the feedback compensation correction module performs parameter compensation in both positive and negative directions, the method specifically includes: firstly, performing parameter compensation in the positive direction; after positive direction compensation, the bus voltage UO detection circuit detects whether the bus voltage recovers to be normal, and if the bus voltage recovers to be normal, the inductance L parameter is determined to have negative direction drift; if the bus voltage does not return to normal, then parameter compensation is carried out in the negative direction; and after negative direction compensation, the bus voltage UO detection circuit detects whether the bus voltage recovers to be normal, if the bus voltage recovers to be normal, positive direction drift of the inductance L parameter is determined, and if the bus voltage does not recover to be normal, the bus voltage abnormity is not caused by the drift of the inductance L parameter.
The invention also provides a diagnosis and correction recovery method for the PFC bus abnormity, which comprises the following steps:
s1, detecting the bus voltage Uo, and judging whether the bus voltage Uo is too high or too low to cause abnormity;
s2, if the bus voltage Uo is abnormal, judging whether the bus voltage Uo is abnormal caused by the fact that the front end input alternating current side voltage Us exceeds an upper threshold and a lower threshold;
and S3, if the alternating-current side voltage Us is within the threshold range, judging the abnormality caused by the abnormal work of the Boost circuit, and performing parameter compensation in the positive direction and the negative direction.
As a further improvement of the present invention, in S2, the level of the ac side voltage Us is determined according to the peak value of the sampling steamed bread wave Um.
As a further improvement of the present invention, in S2, if the bus voltage Uo is lower than the lowest threshold value and causes an abnormality, it is directly determined that the ac side voltage Us is too low, and if the bus voltage Uo is higher than the highest threshold value and causes an abnormality, it is further determined whether the ac side voltage Us is too high.
As a further improvement of the present invention, in S3, when the Boost circuit is abnormal, the inductance L parameter in the Boost circuit is used as a correction control parameter to perform parameter compensation in both positive and negative directions.
As a further improvement of the present invention, when performing parameter compensation in both positive and negative directions, the method specifically includes:
s31, performing parameter compensation in the positive direction;
s32, detecting whether the bus voltage is recovered to be normal or not, and if the bus voltage is recovered to be normal, determining that the inductance L parameter has negative direction drift;
s33, if the bus voltage does not return to normal, performing parameter compensation in the negative direction;
and S34, detecting whether the bus voltage returns to normal, if the bus voltage returns to normal, determining that the inductance L parameter drifts in the positive direction, and if the bus voltage does not return to normal, determining that the bus voltage is abnormal and is not caused by the inductance L parameter drifts.
The invention has the beneficial effects that:
(1) the voltage on the alternating current side can be judged according to the sampling steamed bread wave Um, whether the bus voltage is abnormal caused by the fact that the voltage Us on the alternating current side exceeds the threshold range is judged, and whether the bus voltage is abnormal caused by the fact that the Boost circuit works abnormally can be further determined.
(2) When the abnormity caused by the abnormal work of the Boost circuit is determined, the inductance L parameter in the Boost circuit can be used as a correction control parameter to automatically perform parameter compensation in positive and negative directions, and the parameter drift problem caused by the aging of the inductance is corrected, so that the problem of bus abnormity caused by the drift of PFC parameters is solved.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic circuit diagram of a PFC bus abnormality diagnosis and correction recovery circuit according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for diagnosing, correcting and recovering an abnormal PFC bus according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art so that they can be readily implemented by those skilled in the art. As can be readily understood by those skilled in the art to which the present invention pertains, the embodiments to be described later may be modified into various forms without departing from the concept and scope of the present invention. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" include plural forms as well, unless the contrary is expressly stated. The term "comprising" as used in the specification embodies particular features, regions, constants, steps, actions, elements and/or components and does not exclude the presence or addition of other particular features, regions, constants, steps, actions, elements, components and/or groups.
All terms including technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in dictionaries are to be interpreted as meanings complied with in the relevant technical documents and the present disclosure, and cannot be interpreted as having a very formal meaning without definition.
As shown in fig. 1, a circuit for diagnosing, correcting and recovering an abnormality of a PFC bus according to an embodiment of the present invention includes: the device comprises a rectifier bridge, a Boost circuit, a steamed bread wave Um detection circuit, a bus voltage UO detection circuit, a current detection circuit, a driving circuit, an information fusion processing module and a feedback compensation correction module.
The rectifier bridge consists of four diodes. L, Q, D and Co to form a Boost circuit, achieving the purpose of boosting, improving power factor and suppressing harmonic wave. R1 and R2 form a steamed bun wave Um detection circuit. R3, R4 and R5 constitute a bus voltage UO detection circuit. RS is a current detection circuit. The multiplier, an operational amplifier A1, an A1 peripheral circuit consisting of R6, R7 and C1, an operational amplifier A2, a sawtooth wave and a driver form a driving circuit. RL denotes a load. The driver adopts a general driving chip, the PWM signal output by a2 is typically 5V or 3.3V, which is not enough to drive the switching tube, and the driver can convert the low voltage signal into a PWM signal of 15V, thereby driving the MOS transistor Q.
The AC side voltage Us is boosted through a Boost circuit after passing through a rectifier bridge, a sampling steamed bread wave Um is generated after passing through full-bridge uncontrolled rectification, the sampling steamed bread wave Um is detected through a steamed bread wave Um detection circuit, Um voltage is used as input of the Boost circuit, and a bus voltage UO after boosting is output of the Boost circuit and is detected through a bus voltage UO detection circuit. The information fusion processing module judges the output voltage feedback signal of the sampling steamed bread wave Um and the output voltage feedback signal of the bus voltage Uo and confirms whether the bus voltage Uo is abnormal or not.
And the information fusion processing module judges whether the bus voltage UO is too high or too low to cause abnormity according to the signal output by the bus voltage UO detection circuit. The information fusion processing module is generally implemented by adopting an MCU.
When the bus voltage is normal (namely, the bus voltage Uo is in a normal range), the feedback compensation correction module is used as an error amplifier, the voltage feedback signal of the output sampling time wave Um is processed to obtain Vsin, the voltage feedback signal of the output bus voltage Uo is processed to obtain Vea, the Vea and the Vsin are multiplied to obtain Ve, the voltage feedback signal of the current detection circuit is processed to obtain Vi, the Ve is compared with the Vi to obtain Vr, the Vr is compared with the sawtooth wave to obtain a PWM waveform, and the PWM waveform drives the MOS tube Q in the Boost circuit to be turned on and turned off after passing through the driver.
When the bus voltage is abnormal, the information fusion processing module judges the height of the alternating current side voltage Us according to the peak value of the sampling steamed wave Um, and further judges whether the abnormality is caused by the fact that the front end input alternating current side voltage Us exceeds the threshold range. If the bus voltage Uo is too low (i.e., lower than the lowest threshold) to cause an abnormality, it is directly determined that the ac side voltage Us is too low, and if the bus voltage Uo is too high (i.e., higher than the highest threshold) to cause an abnormality, it is further determined whether the ac side voltage Us is too high. If the AC side voltage Us is too high, it is directly determined that the AC side voltage Us is too high. If the alternating-current side voltage Us is within the threshold range, the bus voltage Uo caused by the abnormal work of the Boost circuit is determined to be abnormal, at the moment, the information fusion processing module sends a signal to the feedback compensation correction module, and the feedback compensation correction module carries out parameter compensation in the positive direction and the negative direction.
And the feedback compensation correction module performs parameter compensation in positive and negative directions by taking an inductance L parameter in the Boost circuit as a correction control parameter. The method specifically comprises the following steps: firstly, performing parameter compensation in the positive direction; after positive direction compensation, a bus voltage UO detection circuit detects whether the bus voltage is recovered to be normal, and if the bus voltage is recovered to be normal, the inductance L parameter is determined to have negative direction drift; if the bus voltage does not return to normal, then parameter compensation is carried out in the negative direction; and after negative direction compensation, the bus voltage UO detection circuit detects whether the bus voltage recovers to be normal or not, if the bus voltage recovers to be normal, positive direction drift of the inductance L parameter is determined, and if the bus voltage does not recover to be normal, the bus voltage abnormity is not caused by the drift of the inductance L parameter. The positive direction may define a direction in which the inductance parameter increases, and may of course define a direction in which the inductance parameter decreases.
As shown in fig. 2, a method for diagnosing, correcting and recovering an abnormality of a PFC bus according to an embodiment of the present invention includes:
and S1, detecting the bus voltage Uo and judging whether the bus voltage Uo is too high or too low to cause abnormity.
Whether the bus voltage Uo is in a normal range or not is detected through a bus voltage Uo detection circuit, when the bus voltage Uo is in the normal range, the bus voltage is judged to be normal, otherwise, the bus voltage is abnormal due to overhigh or overlow.
S2, if the bus voltage Uo is abnormal, it is determined whether the front-end input ac side voltage Us is abnormal due to exceeding the upper and lower thresholds.
When the bus voltage is abnormal, the height of the alternating-current side voltage Us is judged according to the peak value of the sampling steamed bread wave Um, and whether the abnormality is caused by the fact that the front-end input alternating-current side voltage Us exceeds the threshold range is judged. If the bus voltage Uo is too low (i.e., lower than the lowest threshold) to cause an abnormality, it is directly determined that the ac side voltage Us is too low, and if the bus voltage Uo is too high (i.e., higher than the highest threshold) to cause an abnormality, it is further determined whether the ac side voltage Us is too high. If the AC side voltage Us is too high, it is directly determined that the AC side voltage Us is too high. If the alternating-current side voltage Us is within the threshold range, the abnormal condition caused by the abnormal work of the Boost circuit is judged, and parameter compensation in the positive direction and the negative direction is needed.
And (3) taking the inductance L parameter in the Boost circuit as a correction control parameter to perform parameter compensation in positive and negative directions. The method specifically comprises the following steps:
and S31, performing parameter compensation in the positive direction. The direction in which the inductance L parameter increases is defined as the positive direction, but may be defined as the direction in which the inductance parameter decreases.
And S32, detecting whether the bus voltage is recovered to be normal or not, and if the bus voltage is recovered to be normal, determining that the inductance L parameter has negative direction drift.
And S33, if the bus voltage does not return to normal, performing parameter compensation in the negative direction.
And S34, detecting whether the bus voltage returns to normal, if the bus voltage returns to normal, determining that the inductance L parameter drifts in the positive direction, and if the bus voltage does not return to normal, determining that the bus voltage is abnormal and is not caused by the inductance L parameter drifts. Because the Boost circuit is a booster circuit, the bus voltage is not lower than the input voltage,
the following will be specifically explained with exemplary embodiments.
Taking a household air conditioner as an example, the rated bus voltage is 380V, the bus voltage can normally work within the range of 240V-450V, and the system can not normally work if the bus voltage exceeds the range and is abnormal. If the bus voltage abnormity is judged to be that the bus voltage is too low, the abnormity is judged to be caused by too low input voltage, and the system outputs an 'input voltage is too low' signal. If the abnormal bus voltage is judged to be overhigh bus voltage, whether the input voltage is overhigh is further judged. The input voltage of the household air conditioner is rated as 220V of mains supply, the household air conditioner can normally work within the range of 160V-260V, and the input voltage can be judged not to exceed 260V. If the peak value of the rectified sampling steamed bread wave Um exceeds 368V, the abnormal bus voltage is determined to be caused by overhigh input voltage, and the system outputs an 'overhigh input voltage' signal. If the input voltage is in the normal range, the PFC inductance parameter is determined to drift, so that the pole of the system is changed, the dynamic response of the system is deteriorated, and the abnormal bus voltage is caused. A compensating correction of the parameter is then attempted.
The parameter compensation is to compensate the feedback signal to a certain extent through a feedback loop to optimize the system stability margin. Since it cannot be determined in which direction the parameter of the inductance has drifted, the compensation of the parameter is divided into two steps: firstly, performing parameter compensation in a positive direction (the direction is manually specified, and the direction of increasing the inductance parameter is defined as the positive direction), then detecting whether the bus voltage is recovered to be normal, and if the bus voltage is recovered to be normal, determining that the inductance parameter has negative direction drift; secondly, if the bus voltage does not recover to be normal, parameter compensation is carried out in the negative direction again, if the bus voltage recovers to be normal, the fact that the inductive parameter drifts in the positive direction can be determined, but if the bus voltage does not recover to be normal, the bus abnormality is not caused by the drift of the inductive parameter, but other reasons are not in the related range of the scheme. The drifting direction of the inductance parameter is judged by two parameter compensation attempts in opposite directions and detecting whether the bus voltage is recovered to be normal or not, or the reason that the inductance parameter drifting is abnormal of the bus is eliminated.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A PFC bus abnormity diagnosis and correction recovery circuit is characterized by comprising:
the device comprises a rectifier bridge, a Boost circuit, a steamed bread wave Um detection circuit, a bus voltage UO detection circuit, a current detection circuit, a driving circuit, an information fusion processing module and a feedback compensation correction module;
the alternating-current side voltage Us is boosted through the Boost circuit after passing through the rectifier bridge, a sampling steamed bread wave Um generated after rectification is detected through the steamed bread wave Um detection circuit, the boosted bus voltage Uo is detected through the bus voltage Uo detection circuit, the driving circuit drives an MOS (metal oxide semiconductor) tube Q in the Boost circuit to be turned on and off, the information fusion processing module judges an output voltage feedback signal of the sampling steamed bread wave Um and a voltage feedback signal of the bus voltage Uo to determine whether the bus voltage Uo is abnormal or not, when the abnormality caused by the abnormal work of the Boost circuit is determined, the information fusion processing module sends a signal to the feedback compensation correction module, and the feedback compensation correction module performs parameter compensation in positive and negative directions.
2. The PFC bus abnormality diagnosis and correction recovery circuit of claim 1, wherein the information fusion processing module determines whether the bus voltage Uo is abnormal according to the signal output by the bus voltage Uo detection circuit, and when the bus voltage Uo is abnormal, the information fusion processing module determines a level of the ac side voltage Us according to a peak value of the sampling clock wave Um, and further determines whether the bus voltage Uo is abnormal due to the ac side voltage Us exceeding a threshold range.
3. The PFC bus abnormality diagnosis and correction recovery circuit according to claim 2, wherein if the bus voltage Uo is lower than the lowest threshold value to cause an abnormality, it is directly judged that the ac side voltage Us is excessively low, and if the bus voltage Uo is higher than the highest threshold value to cause an abnormality, it is further judged whether the ac side voltage Us is excessively high.
4. The PFC bus abnormality diagnosis and correction recovery circuit according to claim 3, wherein if the AC side voltage Us is within a threshold range, it is determined that the bus voltage Uo caused by the Boost circuit working abnormality is abnormal, and at this time, the feedback compensation correction module performs parameter compensation in both positive and negative directions by using an inductance L parameter in the Boost circuit as a correction control parameter.
5. The PFC bus abnormality diagnosis and correction recovery circuit of claim 4, wherein the feedback compensation correction module, when performing parameter compensation in both positive and negative directions, specifically comprises: firstly, performing parameter compensation in the positive direction; after positive direction compensation, the bus voltage UO detection circuit detects whether the bus voltage recovers to be normal, and if the bus voltage recovers to be normal, the inductance L parameter is determined to have negative direction drift; if the bus voltage does not return to normal, then parameter compensation is carried out in the negative direction; and after negative direction compensation, the bus voltage UO detection circuit detects whether the bus voltage recovers to be normal, if the bus voltage recovers to be normal, positive direction drift of the inductance L parameter is determined, and if the bus voltage does not recover to be normal, the bus voltage abnormity is not caused by the drift of the inductance L parameter.
6. A method for diagnosing and correcting and recovering the abnormality of a PFC bus, which adopts the circuit for diagnosing and correcting and recovering the abnormality of the PFC bus according to any one of claims 1 to 5, comprising:
s1, detecting the bus voltage Uo, and judging whether the bus voltage Uo is too high or too low to cause abnormity;
s2, if the bus voltage Uo is abnormal, judging whether the bus voltage Uo is abnormal caused by the fact that the front end input alternating current side voltage Us exceeds an upper threshold and a lower threshold;
and S3, if the alternating-current side voltage Us is within the threshold range, judging the abnormality caused by the abnormal work of the Boost circuit, and performing parameter compensation in the positive direction and the negative direction.
7. The method for diagnosing and correcting recovery from abnormality of the PFC bus of claim 6, wherein in S2, the level of the AC-side voltage Us is judged according to the peak value of the sampled time wave Um.
8. The method for diagnosing and correcting and recovering a PFC bus abnormality according to claim 6, wherein in S2, if the bus voltage Uo is lower than the lowest threshold value to cause an abnormality, it is directly determined that the ac side voltage Us is too low, and if the bus voltage Uo is higher than the highest threshold value to cause an abnormality, it is further determined whether the ac side voltage Us is too high.
9. The method for diagnosing, correcting and recovering from the abnormality of the PFC bus according to claim 6, wherein in S3, when the Boost circuit is abnormal in operation, the parameter of the inductance L in the Boost circuit is used as a correction control parameter to perform the parameter compensation in both positive and negative directions.
10. The method for diagnosing, correcting and recovering the abnormality of the PFC bus according to claim 9, wherein when performing the parameter compensation in both positive and negative directions, the method specifically comprises:
s31, performing parameter compensation in the positive direction;
s32, detecting whether the bus voltage is recovered to be normal or not, and if the bus voltage is recovered to be normal, determining that the inductance L parameter has negative direction drift;
s33, if the bus voltage does not return to normal, performing parameter compensation in the negative direction;
and S34, detecting whether the bus voltage returns to normal, if the bus voltage returns to normal, determining that the inductance L parameter drifts in the positive direction, and if the bus voltage does not return to normal, determining that the bus voltage is abnormal and is not caused by the inductance L parameter drifts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911253288.2A CN111082651B (en) | 2019-12-09 | 2019-12-09 | Circuit and method for diagnosing, correcting and recovering PFC bus abnormity |
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| CN112798997A (en) * | 2020-12-30 | 2021-05-14 | 四川长虹空调有限公司 | Frequency converter direct-current voltage detection and correction method |
| CN114034902A (en) * | 2021-09-28 | 2022-02-11 | 海信（山东）空调有限公司 | Phase voltage detection method and device, variable frequency air conditioner and control method and device thereof |
| CN114069573A (en) * | 2021-11-05 | 2022-02-18 | 青岛海信日立空调系统有限公司 | Air conditioner |
| WO2022068344A1 (en) * | 2020-09-30 | 2022-04-07 | Oppo广东移动通信有限公司 | Power source providing apparatus, and charging method and system |
| CN114362333A (en) * | 2020-10-13 | 2022-04-15 | 比亚迪股份有限公司 | Charging device and vehicle with same |
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| CN114069573B (en) * | 2021-11-05 | 2024-03-01 | 青岛海信日立空调系统有限公司 | Air conditioner |
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| CN111082651B (en) | 2021-02-23 |
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