CN109473990B - Power supply fluctuation adjusting method and system of electric appliance and electric appliance - Google Patents
Power supply fluctuation adjusting method and system of electric appliance and electric appliance Download PDFInfo
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- CN109473990B CN109473990B CN201910023970.6A CN201910023970A CN109473990B CN 109473990 B CN109473990 B CN 109473990B CN 201910023970 A CN201910023970 A CN 201910023970A CN 109473990 B CN109473990 B CN 109473990B
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- 230000001276 controlling effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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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
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Abstract
The invention discloses a power supply fluctuation adjusting method of an electric appliance, wherein a PFC circuit is arranged in the electric appliance, and the method comprises the following steps: detecting the bus voltage of the electric appliance, and starting a PFC circuit to regulate the bus voltage when the bus voltage drops; when the voltage of the bus falls below a first set value, the PFC circuit is closed; and after the time set by the PFC circuit is closed, restarting the PFC circuit to adjust the bus voltage. The power supply fluctuation adjusting method of the electric appliance can stabilize the bus voltage of the electric appliance in time when the bus voltage of the electric appliance drops. The invention also discloses a power supply fluctuation adjusting system of the electric appliance and the electric appliance adopting the system.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a power supply fluctuation adjusting method and system of an electric appliance and the electric appliance adopting the system.
Background
In recent years, voltage sag has become a main cause of power quality problems, and the comfort experienced by users using electrical appliances is seriously affected, so that it has become more urgent to improve the power source adaptability to deal with the problems caused by voltage sag. The voltage drop is also called voltage dip, voltage drop and voltage sag, and refers to a phenomenon that the root mean square value of the power supply voltage suddenly drops to 10% -90% of the rated voltage amplitude in a short time, and the typical duration time is 0.5-30 cycles.
In the field of variable frequency air conditioners, the air conditioner cannot provide energy for the continuous operation of a compressor due to voltage drop in the operation process; and meanwhile, the direct-current voltage at two ends of an electrolytic capacitor of a direct-current energy storage circuit of the frequency converter cannot be supplied regularly and quantitatively, so that the direct-current voltage is remarkably reduced, once a power supply is recovered to be normal, the electrolytic capacitor is recharged until the voltage values at two ends of the electrolytic capacitor reach the voltage value before falling, a charging current can be generated in the period, and if the charging current is very large, the rectifying circuit and the filter circuit of the frequency converter can be damaged, and the power supply is impacted to cause the tripping of a power circuit breaker.
Currently, a general solution to these situations is to provide an under-voltage protection function of the intermediate dc energy storage link, and when the voltage is lower than the under-voltage protection value, the frequency converter will force the frequency conversion load to stop working due to the under-voltage protection. However, this method of ensuring the reliability of the air conditioner at the cost of a protective shutdown is difficult to satisfy the user's appeal for environmental comfort.
Disclosure of Invention
The invention aims to provide a power supply fluctuation adjusting method and system of an electric appliance aiming at the defects in the prior art, so as to solve the technical problem that the electric appliance in the prior art is unstable in working when the voltage of a power grid drops.
In an embodiment of the present invention, a power supply fluctuation adjustment method for an electrical appliance is provided, where the electrical appliance is provided with a PFC circuit, and the method includes:
detecting the bus voltage of the electric appliance, and starting a PFC circuit to regulate the bus voltage when the bus voltage drops;
when the voltage of the bus falls below a first set value, the PFC circuit is closed;
and after the time set by the PFC circuit is closed, restarting the PFC circuit to adjust the bus voltage.
In an embodiment of the present invention, the method for adjusting power supply fluctuation of an electrical appliance further includes:
and after the PFC circuit is closed, if the bus voltage further falls below a second set value, controlling the electrical appliance to be in fault shutdown.
In an embodiment of the present invention, the method for adjusting power supply fluctuation of an electrical appliance further includes:
and judging whether the PFC circuit can normally work, and prompting the PFC circuit to have a fault if the PFC circuit cannot normally work.
In the embodiment of the invention, whether the PFC circuit can normally work is judged according to the waveform of the bus voltage after the PFC circuit is started after the bus voltage drops, and if the waveform of the bus voltage drops to be lower than a set voltage protection value continuously for three times, the PFC circuit can not normally work is judged.
In the embodiment of the invention, after the PFC circuit is restarted, the electric appliance delays the fault of which the fault level is lower than the voltage drop fault.
In the embodiment of the invention, after the PFC circuit is restarted, the voltage pulse impact protection function of the electric appliance is turned off.
In the embodiment of the invention, after the PFC circuit is started, the switching frequency of the PFC circuit and the target value of the set bus voltage are calculated according to the current bus voltage, the adjusted bus voltage value is compared with the target value, if the adjusted bus voltage value can reach the target value, the PFC circuit normally works, otherwise, a fault is prompted.
In an embodiment of the present invention, a power supply fluctuation adjustment system for an electrical appliance is further provided, including:
the bus voltage detection module is used for detecting the bus voltage of the electric appliance;
the PFC circuit is used for adjusting the bus voltage when the bus voltage drops;
the control module is used for controlling the PFC circuit, when the voltage of the bus falls below a first set value, the control module closes the PFC circuit, and restarts the PFC circuit to adjust the voltage of the bus after the PFC circuit is closed for a set time.
In the embodiment of the invention, after the control module closes the PFC circuit, if the bus voltage further falls below a second set value, the control module controls the electrical appliance to be in fault shutdown.
In the embodiment of the invention, when the voltage of the bus falls, the control module judges whether the PFC circuit can normally work, and if the PFC circuit cannot normally work, the control module prompts the PFC circuit to break down.
In the embodiment of the invention, the control module judges whether the PFC circuit can normally work according to the waveform of the bus voltage after the PFC circuit is started after the bus voltage drops, and if the waveform of the bus voltage drops below a set voltage protection value continuously for three times, the control module judges that the PFC circuit cannot normally work.
In the embodiment of the invention, after the PFC circuit is restarted, the control module delays the fault of which the fault level is lower than the voltage drop fault.
In the embodiment of the invention, after the PFC circuit is restarted, the control module closes the voltage pulse impact protection function of the electric appliance.
In the embodiment of the invention, after the PFC circuit is started, the switching frequency of the PFC circuit and the target value of the set bus voltage are calculated according to the current bus voltage, the adjusted bus voltage value is compared with the target value, if the adjusted bus voltage value can reach the target value, the PFC circuit normally works, otherwise, a fault is prompted.
The embodiment of the invention also provides an electric appliance, which adopts the power supply fluctuation adjusting system of the electric appliance.
Compared with the prior art, the method and the system for adjusting the power supply fluctuation of the electric appliance control the turn-off and turn-on of the PFC circuit according to the falling amplitude of the bus voltage when the bus voltage falls, so that the recovery of the bus voltage is realized, the electric appliance normally operates in the control process, the problem that the electric appliance cannot work due to the voltage falling is solved, and meanwhile, the power supply adaptability of the power supply is improved under the condition that other hardware is not damaged.
Drawings
Fig. 1 is a detailed flowchart of a power supply fluctuation adjustment method of an electric appliance according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a power supply fluctuation adjustment system of an electric appliance according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, in an embodiment of the present invention, a power supply fluctuation adjustment method for an electrical appliance is provided, where the electrical appliance is provided with a PFC circuit, and the PFC circuit is used to adjust a bus voltage when the bus voltage drops. The above method is explained below.
Firstly, the bus voltage of the electric appliance is detected, and when the bus voltage drops, the PFC circuit is started to regulate the bus voltage.
In an electrical appliance provided with a PFC circuit, the PFC circuit is usually started to regulate a bus voltage when the bus voltage drops. After the PFC circuit is started, the switching frequency of the PFC circuit and the target value of the set bus voltage are calculated according to the current bus voltage, the adjusted bus voltage value is compared with the target value, if the adjusted bus voltage value can reach the target value, the PFC circuit works normally, and otherwise, a fault is prompted.
It should be noted that, once the voltage drop amplitude is too large, the PFC may be damaged in the voltage correction process, and at this time, the correction of the bus voltage by the PFC circuit may fail, so that after the PFC circuit is started, it is necessary to determine whether the PFC circuit can normally operate, and if the PFC circuit cannot normally operate, it is prompted that the PFC circuit fails. In the embodiment of the invention, whether the PFC circuit can normally work is judged according to the waveform of the bus voltage after the PFC circuit is started after the bus voltage drops, if the waveform of the bus voltage drops to be lower than a set voltage protection value continuously for three times, the PFC circuit is judged not to normally work, and the PFC circuit is prompted to break down and the electric appliance is shut down, so that the electric appliance is protected.
And when the bus voltage drops to be lower than a first set value, the PFC circuit is closed.
It should be noted that, when the bus voltage is lower than the first setting value, if the PFC circuit is not turned off, the difference between the bus voltage drop amplitude and the reference voltage required for normal operation is too large, which may cause a sudden rise of the PFC switching frequency, and thus a too fast voltage rise, and the transient pulse shock of the current and the heat generated by the too fast switching frequency may cause an irreversible damage to a part of circuit power devices, so the PFC circuit should be turned off at this time.
And after the time set by the PFC circuit is closed, restarting the PFC circuit to adjust the bus voltage.
It should be noted that the set time for turning off the PFC circuit is N current cycles of the PFC circuit, where N is an integer, N cannot be too small, N is too short, the control speed cannot keep up with the reaction time, N cannot be too large, and N may cause overcurrent to cause overcurrent protection of the circuit, and the bus voltage is not lower than the second set value.
It should be noted that, after the PFC circuit is turned off, if the bus voltage further drops below the second set value, if the electrical apparatus is not controlled to perform the shutdown, the operating voltage of the electrical apparatus may be too low to cause damage to the electrical apparatus, and at this time, the electrical apparatus is controlled to perform the shutdown.
It should be noted that, after restarting the PFC circuit, the electrical appliance delays the faults with the fault level lower than the voltage drop fault, because the faults with the low level are likely to be caused by the voltage drop partially and the increase of the switching frequency by the PFC circuit, and once the PFC circuit restores the bus voltage to normal, the faults disappear. In addition, after the PFC circuit is restarted, voltage pulse shock may be generated due to voltage rise caused by operation of the PFC circuit, and the voltage pulse shock may trigger a voltage pulse shock protection function of the electrical appliance, so that the voltage pulse shock protection function of the electrical appliance is turned off at this time.
As shown in fig. 2, in the embodiment of the present invention, a power supply fluctuation adjustment system for an electrical appliance is further provided, which includes a bus voltage detection module 21, a PFC circuit 22, and a control module 23. And the bus voltage detection module 21 is used for detecting the bus voltage of the electric appliance. And the PFC circuit is used for regulating the bus voltage when the bus voltage drops. The control module 23 is configured to control the PFC circuit 22, and when the bus voltage drops below a first set value, the control module 23 turns off the PFC circuit 22, and restarts the PFC circuit 22 to adjust the bus voltage after the PFC circuit 22 is turned off for a set time. Further, after the control module 23 turns off the PFC circuit 22, if the bus voltage further drops below a second set value, the control module controls the electrical apparatus to perform a shutdown.
When the bus voltage drops, the control module 23 determines whether the PFC circuit 22 can normally operate, and prompts the PFC circuit 22 that a fault occurs if the PFC circuit 22 cannot normally operate. The control module 23 determines whether the PFC circuit 22 can normally operate according to the waveform of the bus voltage after the PFC circuit 22 is started when the bus voltage drops, and determines that the PFC circuit 22 cannot normally operate if the waveform of the bus voltage drops below a set voltage protection value for three consecutive times.
After the PFC circuit 22 is restarted, the control module 23 delays a fault with a fault level lower than the voltage drop fault, and turns off the voltage pulse surge protection function to prevent the voltage pulse surge from triggering the voltage pulse surge protection function. After the PFC circuit 22 is restarted, the switching frequency of the PFC circuit 22 and a target value of a set bus voltage are calculated according to the current bus voltage, and then the adjusted bus voltage value is compared with the target value, if the adjusted bus voltage value can reach the target value, the PFC circuit 22 normally works, otherwise, a fault is prompted.
Further, the embodiment of the invention also provides an electric appliance, and the electric appliance adopts the power supply fluctuation adjusting system of the electric appliance.
In summary, according to the power supply fluctuation adjustment method and system for the electrical appliance, when the bus voltage drops, the PFC circuit is controlled to be turned off and on according to the dropping amplitude of the bus voltage, so that the bus voltage is recovered, the electrical appliance normally operates in the control process, the problem that the electrical appliance cannot work due to the voltage drop is solved, and meanwhile, the power supply adaptability of the power supply is improved under the condition that other hardware is not damaged.
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 supply fluctuation adjustment method of an electric appliance provided with a PFC circuit is characterized by comprising the following steps:
detecting the bus voltage of the electric appliance, and starting a PFC circuit to regulate the bus voltage when the bus voltage drops;
judging whether the PFC circuit can normally work, if the voltage waveform of the bus falls below a set voltage protection value for three times continuously, judging that the PFC circuit cannot normally work, and prompting the PFC circuit to break down and turn off the electrical appliance;
when the voltage of the bus falls below a first set value, the PFC circuit is closed;
after the PFC circuit is closed for a set time, restarting the PFC circuit to adjust the bus voltage;
and after the PFC circuit is closed, if the bus voltage further falls below a second set value, controlling the electrical appliance to be in fault shutdown.
2. The power supply fluctuation adjustment method of an electric appliance according to claim 1, wherein after the PFC circuit is restarted, the electric appliance delays a fault having a lower fault level than the voltage sag fault.
3. The power supply fluctuation adjustment method of an electric appliance according to claim 1, wherein a voltage pulse surge protection function of the electric appliance is turned off after the PFC circuit is restarted.
4. The method as claimed in claim 1, wherein after the PFC circuit is started, the switching frequency of the PFC circuit is calculated according to the current bus voltage and the target value of the set bus voltage, and then the adjusted bus voltage value is compared with the target value, if the adjusted bus voltage value can reach the target value, the PFC circuit normally operates, otherwise, a fault is indicated.
5. A power surge regulation system for an electrical appliance, comprising:
the bus voltage detection module is used for detecting the bus voltage of the electric appliance;
the PFC circuit is used for adjusting the bus voltage when the bus voltage drops;
the control module is used for controlling the PFC circuit; judging whether the PFC circuit can normally work, if the voltage waveform of the bus falls below a set voltage protection value for three times continuously, judging that the PFC circuit cannot normally work, and prompting the PFC circuit to break down and turn off the electrical appliance; when the bus voltage drops to be lower than a first set value, the control module closes the PFC circuit, and restarts the PFC circuit to adjust the bus voltage after the PFC circuit is closed for a set time; and after the control module closes the PFC circuit, if the bus voltage further falls below a second set value, the control module controls the electrical appliance to be in fault shutdown.
6. The power supply fluctuation adjustment system of the electric appliance according to claim 5, wherein after the PFC circuit is restarted, the control module delays the fault with the fault level lower than the voltage drop fault.
7. The power surge regulation system of claim 5, wherein the control module turns off a voltage pulse surge protection function of the appliance after restarting the PFC circuit.
8. The power supply fluctuation adjustment system of an electric appliance according to claim 5, wherein after the PFC circuit is started, the switching frequency of the PFC circuit and a target value of a set bus voltage are calculated according to a current bus voltage, then the adjusted bus voltage value is compared with the target value, if the adjusted bus voltage value can reach the target value, the PFC circuit normally works, otherwise, a fault is prompted.
9. An electric appliance characterized in that a power supply fluctuation adjustment system of the electric appliance according to any one of claims 5 to 8 is employed.
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| CN201910023970.6A CN109473990B (en) | 2019-01-10 | 2019-01-10 | Power supply fluctuation adjusting method and system of electric appliance and electric appliance |
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| CN201910023970.6A CN109473990B (en) | 2019-01-10 | 2019-01-10 | Power supply fluctuation adjusting method and system of electric appliance and electric appliance |
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| CN110571934B (en) * | 2019-09-26 | 2020-12-01 | 珠海格力电器股份有限公司 | Control method of switching device, switching device and power utilization system |
| CN110762794B (en) * | 2019-10-31 | 2021-07-20 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN111924674A (en) * | 2020-08-17 | 2020-11-13 | 深圳市海浦蒙特科技有限公司 | Elevator operation control method and system and elevator |
| CN113829881B (en) * | 2021-09-23 | 2023-06-06 | 珠海格力电器股份有限公司 | Voltage fluctuation protection method and device for electric appliance, storage medium and electric appliance |
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| CN102253298A (en) * | 2011-06-23 | 2011-11-23 | 宁波奥克斯电气有限公司 | PFC (Power Factor Correction) fault detection method for direct-current variable frequency air conditioner controller |
| CN102345915B (en) * | 2011-08-02 | 2013-11-27 | 宁波奥克斯电气有限公司 | Fault operation control method of DC (direct current) convertible frequency air conditioner |
| CN104218785B (en) * | 2013-05-31 | 2017-08-25 | 杭州先途电子有限公司 | A kind of Active Power Factor Correction System |
| JP6153491B2 (en) * | 2014-03-28 | 2017-06-28 | オムロンオートモーティブエレクトロニクス株式会社 | Power supply |
| CN105098709B (en) * | 2015-07-01 | 2018-05-08 | 新誉轨道交通科技有限公司 | The guard method of motor-car air-conditioning electrical heating overtemperature protection device |
| CN108347202B (en) * | 2017-01-23 | 2021-04-13 | 宝山钢铁股份有限公司 | Method for resisting voltage sag of frequency converter for high-capacity fan |
| CN207039447U (en) * | 2017-07-31 | 2018-02-23 | 珠海格力电器股份有限公司 | Fault detection circuit |
| CN108521215B (en) * | 2018-05-11 | 2019-09-20 | 珠海格力电器股份有限公司 | Control method and control device of PFC circuit |
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