CN110131834B - Power failure identification method and device and air conditioner - Google Patents
Power failure identification method and device and air conditioner Download PDFInfo
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- CN110131834B CN110131834B CN201910419944.5A CN201910419944A CN110131834B CN 110131834 B CN110131834 B CN 110131834B CN 201910419944 A CN201910419944 A CN 201910419944A CN 110131834 B CN110131834 B CN 110131834B
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- bus voltage
- voltage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The invention provides a power failure identification method, which comprises the following steps: detecting and comparing the bus voltage with the control voltage, timing the duration that the bus voltage is lower than the control voltage, judging whether the duration is shorter than the preset time and whether the bus voltage is lower than a preset protection threshold value, and identifying whether the bus voltage is powered off according to the judgment result. Compared with the prior art, the power failure identification method provided by the invention has the advantages that the control voltage is additionally arranged outside the bus, the bus voltage and the control voltage are detected, sampled and compared in size in real time, the duration time that the bus voltage is lower than the control voltage is recorded, the duration time is compared with the preset time, whether the bus voltage is lower than the preset protection threshold value is judged, and whether the bus voltage is in power failure is judged according to the two judgment modes. The bus voltage failure reason is bus voltage outage or bus voltage over-low protection to shield the bus voltage over-low protection reason.
Description
Technical Field
The invention belongs to the technical field of electric appliances, and particularly relates to a power failure identification method and device and an air conditioner.
Background
In the variable frequency air conditioning unit, in order to prevent the problem that a power device switch under low voltage is easy to damage, the bus voltage is usually set to be too low for protection. The protection can close the power device of the variable frequency drive plate at the moment of bus voltage drop, and the microsecond or millisecond response is generally realized.
When the power grid is powered off or is manually powered off, the fault also occurs at the moment of bus voltage drop; meanwhile, as the frequency conversion main board is provided with a large-capacity capacitor, the frequency conversion main board can still support the switching power supply to work for several seconds to tens of seconds after the power grid is powered off, and the fault can be displayed and causes trouble in use for users. Most of the existing variable frequency air conditioners adopt an input voltage estimation mode, have no input voltage sampling circuit and cannot effectively detect the input voltage at the front section.
Disclosure of Invention
The invention aims to provide a power failure identification method to solve the problem that the protection of too low voltage of a shielding bus cannot be realized in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the power failure identification method comprises the following steps: detecting and comparing bus voltage and control voltage, timing the duration time that the bus voltage is lower than the control voltage, judging whether the duration time is shorter than preset time and whether the bus voltage is lower than a preset protection threshold value, and identifying whether the bus voltage is powered off according to a judgment result.
Preferably, the instantaneous values of the bus voltage and the control voltage are compared using a comparator.
Preferably, if the bus voltage is greater than the control voltage, the comparator outputs a low level; and if the bus voltage is less than the control voltage, the comparator outputs a high level.
Further, if the duration is less than the preset time and the bus voltage is lower than a preset protection threshold, displaying that the bus voltage is too low to cause a fault.
Further, if the duration time is less than a preset time and the bus voltage is higher than a preset protection threshold value, the bus voltage and the control voltage are continuously detected and compared.
Further, if the duration is longer than the preset time and the bus voltage is lower than the preset protection threshold, the bus voltage is powered off, and the bus voltage too low fault is not displayed.
Further, if the duration time is longer than a preset time and the bus voltage is higher than a preset protection threshold value, the bus voltage and the control voltage are continuously detected and compared.
Preferably, the voltage waveform when the bus voltage is supplied with power normally is a steamed bread wave.
Further, the period of the bus voltage is T, and the preset time is T, T is greater than or equal to ⅓ T and less than or equal to 2T.
Preferably, the preset time T is a.
Another object of the present invention is to provide a power outage identification apparatus, comprising:
the sampling module is used for detecting the bus voltage in real time;
the comparison module is connected with the bus voltage and the control voltage and compares the bus voltage with the control voltage;
the control module is used for receiving the detection signal of the sampling module and the comparison result of the sampling comparison module, timing the duration that the bus voltage is lower than the control voltage, judging whether the duration is smaller than the preset time and whether the bus voltage is lower than a preset protection threshold value, and identifying whether the bus voltage is powered off according to the judgment result.
Further, the device also comprises a display module for displaying the fault.
Another object of the present invention is to provide an air conditioner, which includes the above power failure recognition device.
The outage identification method provided by the invention has the beneficial effects that: compared with the prior art, the control voltage is additionally arranged outside the bus, the bus voltage and the control voltage are detected, sampled and compared in size in real time, the duration time that the bus voltage is lower than the control voltage is recorded, the duration time is compared with the preset time, whether the bus voltage is lower than the preset protection threshold value is judged, and whether the bus voltage is powered off or not is judged according to the two judging modes. The bus voltage failure reason is bus voltage outage or bus voltage over-low protection to shield the bus voltage over-low protection reason.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of a power outage identification method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of bus voltage and control voltage provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power outage identification apparatus according to an embodiment of the present invention.
Wherein, in the drawings, the reference numerals are mainly as follows:
1. a comparator; 2. a sampling module; 3. and a comparison module.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, fig. 2 and fig. 3 together, a power failure recognition method according to an embodiment of the present invention will now be described. The power failure identification method comprises the following steps: and detecting and comparing the bus voltage and the control voltage in real time, recording the duration of the bus voltage lower than the control voltage, judging the duration and the preset time, and judging the bus voltage and the preset protection threshold value. And during specific judgment, judging whether the duration time is less than the preset time or not, judging whether the bus voltage is lower than a preset protection threshold or not, and identifying whether the bus voltage is powered off or not according to a judgment result.
Compared with the prior art, the power failure identification method provided by the invention has the advantages that the control voltage is additionally arranged outside the bus, the bus voltage and the control voltage are detected, sampled and compared in size in real time, the duration time that the bus voltage is lower than the control voltage is recorded, the duration time is compared with the preset time, whether the bus voltage is lower than the preset protection threshold value is judged, and whether the bus voltage is in power failure or not is judged according to the two judgment modes. The bus voltage failure reason is bus voltage outage or bus voltage over-low protection to shield the bus voltage over-low protection reason.
Preferably, referring to fig. 1 to 2 together, as one embodiment of the power failure recognition method provided by the present invention, the comparator 1 is adopted to compare instantaneous values of the bus voltage and the control voltage in real time and output the comparison result in a level manner. In the present embodiment, the positive electrode of the comparator 1 is connected to the control voltage, and the negative electrode of the comparator 1 is connected to the bus voltage. Therefore, if the bus voltage is greater than the control voltage, the comparator 1 outputs a low level, whereas otherwise it outputs a high level. Of course, in other embodiments, other comparison devices may be selected to replace the comparator 1 according to actual conditions and needs, and the access mode of the comparator 1 may be exchanged with the previous access mode.
Further, referring to fig. 1, if the duration time is less than the preset time and the bus voltage is lower than the preset protection threshold, that is, the comparator 1 continues to output a high level, it is determined that the bus voltage is powered off and a fault is displayed.
Further, if the duration time is less than the preset time and the bus voltage is higher than the preset protection threshold, the bus voltage and the control voltage are continuously detected and compared, and the comparator 1 outputs a low level.
Further, referring to fig. 1, if the duration is longer than the preset time and the bus voltage is lower than the preset protection threshold, that is, the comparator 1 continues to output a high level, it is determined that the bus voltage is a fault and the fault that the bus voltage is too low is not displayed.
Further, referring to fig. 1, if the duration is longer than the preset time and the bus voltage is higher than the preset protection threshold, the bus voltage and the control voltage are continuously detected and compared, and the comparator 1 continuously outputs a low level.
Further, referring to fig. 2, the voltage waveform of the bus voltage during normal power supply is a steamed bread wave, specifically, the input power supplies an alternating current, and the rectifier bridge converts the alternating current into a direct current of the steamed bread wave.
Further, referring to fig. 1 and fig. 2, the period of the bus voltage is T, the preset time is T, T is greater than or equal to ⅓ T and is less than or equal to 2T, and in other embodiments, the value range of T may be selected according to the period T of the steamed bread wave and the magnitude of the control voltage.
Preferably, the optimum value of the preset time is As
Referring to fig. 3, the present invention further provides a power failure recognition device, which includes a sampling module 2 for detecting the bus voltage in real time;
the comparison module 3 is connected with the bus voltage and the control voltage and compares the bus voltage with the control voltage;
and the control module is used for receiving the detection signal of the sampling module 2 and the comparison result of the sampling comparison module 3, timing the duration that the bus voltage is lower than the control voltage, judging whether the duration is smaller than the preset time and whether the bus voltage is lower than a preset protection threshold value, and identifying whether the bus voltage is powered off according to the judgment result.
And the display module is used for displaying the fault display of the power failure of the unit, displaying the fault if the power failure reason is judged to be the power failure of the input power supply, and not displaying the fault if the power failure reason is judged to be the bus voltage protection.
Furthermore, the invention also provides an air conditioner which comprises the power failure identification device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A power failure identification method is characterized by comprising the following steps:
detecting and comparing bus voltage and control voltage, timing duration that the bus voltage is lower than the control voltage, judging whether the duration is shorter than preset time and whether the bus voltage is lower than a preset protection threshold value, and identifying whether the bus voltage is powered off according to a judgment result;
if the duration time is less than the preset time and the bus voltage is lower than a preset protection threshold value, displaying that the bus voltage is too low to cause a fault;
if the duration time is less than the preset time and the bus voltage is higher than a preset protection threshold value, continuously detecting and comparing the bus voltage and the control voltage;
if the duration time is longer than preset time and the bus voltage is lower than the preset protection threshold value, the bus voltage is powered off, and the bus voltage too-low fault is not displayed;
and if the duration time is longer than the preset time and the bus voltage is higher than the preset protection threshold value, continuously detecting the bus voltage and the control voltage and comparing the bus voltage and the control voltage.
2. The power outage identification method according to claim 1, characterized in that:
the instantaneous values of the bus voltage and the control voltage are compared using a comparator.
3. The power outage identification method according to claim 2, characterized in that:
if the bus voltage is greater than the control voltage, the comparator outputs a low level; and if the bus voltage is less than the control voltage, the comparator outputs a high level.
4. The power outage identification method according to claim 1, characterized in that: the voltage waveform when the bus voltage is supplied with power normally is steamed bread wave.
5. The power outage identification method according to claim 1, characterized in that: the period of the bus voltage is T, and the preset time is T, T is not less than ⅓ T and not more than 2T.
6. The power outage identification method according to claim 5, characterized in that: the preset time T is a.
7. An outage identification device, comprising:
the sampling module is used for detecting the bus voltage in real time;
the comparison module is connected with the bus voltage and the control voltage and compares the bus voltage with the control voltage;
the control module is used for receiving the detection signal of the sampling module and the comparison result of the comparison module, timing the duration that the bus voltage is lower than the control voltage, judging whether the duration is shorter than the preset time and whether the bus voltage is lower than a preset protection threshold value, and identifying whether the bus voltage is powered off according to the judgment result;
if the duration time is less than the preset time and the bus voltage is lower than a preset protection threshold value, displaying that the bus voltage is too low to cause a fault;
if the duration time is less than the preset time and the bus voltage is higher than a preset protection threshold value, continuously detecting and comparing the bus voltage and the control voltage;
if the duration time is longer than preset time and the bus voltage is lower than the preset protection threshold value, the bus voltage is powered off, and the bus voltage too-low fault is not displayed;
and if the duration time is longer than the preset time and the bus voltage is higher than the preset protection threshold value, continuously detecting the bus voltage and the control voltage and comparing the bus voltage and the control voltage.
8. The outage identification apparatus of claim 7, further comprising a display module for displaying a fault.
9. An air conditioner, characterized in that: comprising a power outage identification device according to any of claims 7-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910419944.5A CN110131834B (en) | 2019-05-20 | 2019-05-20 | Power failure identification method and device and air conditioner |
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| CN201910419944.5A CN110131834B (en) | 2019-05-20 | 2019-05-20 | Power failure identification method and device and air conditioner |
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| CN110131834B true CN110131834B (en) | 2020-08-11 |
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| CN110596518A (en) * | 2019-10-14 | 2019-12-20 | 珠海格力电器股份有限公司 | Fault detection circuit with simplified structure, fault judgment method and air conditioning equipment |
| CN113125842A (en) * | 2019-12-31 | 2021-07-16 | 北汽福田汽车股份有限公司 | Undervoltage detection method and device, vehicle and electronic equipment |
| CN111219351B (en) * | 2020-01-17 | 2021-01-12 | 珠海格力电器股份有限公司 | Fan rotating speed control method and device, air conditioner external unit device and air conditioning equipment |
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| US5192874A (en) * | 1991-09-26 | 1993-03-09 | Honeywell, Inc. | Interface circuit for low power drain microprocessor-based thermostat |
| CN103033769B (en) * | 2012-12-28 | 2015-01-21 | 海信（山东）空调有限公司 | Fault detection method of three-phase power supply |
| CN104020391B (en) * | 2014-06-13 | 2017-01-25 | 上海新时达电气股份有限公司 | Method for detecting input outage of frequency converter |
| CN105115105B (en) * | 2015-08-28 | 2017-10-13 | 广东美的制冷设备有限公司 | Power failure detection method, detection of power loss system and air conditioner |
| CN109084448B (en) * | 2018-08-23 | 2019-07-02 | 奥克斯空调股份有限公司 | A kind of air conditioning control method, device and air conditioner |
| CN109613452B (en) * | 2018-11-29 | 2021-08-31 | 奥克斯空调股份有限公司 | Power failure detection method for alternating-current power supply and power failure protection method for direct-current variable-frequency compressor |
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