CN112798997B - Frequency converter direct-current voltage detection and correction method - Google Patents
Frequency converter direct-current voltage detection and correction method Download PDFInfo
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- CN112798997B CN112798997B CN202011614934.6A CN202011614934A CN112798997B CN 112798997 B CN112798997 B CN 112798997B CN 202011614934 A CN202011614934 A CN 202011614934A CN 112798997 B CN112798997 B CN 112798997B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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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
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- 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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Abstract
The invention relates to a frequency converter voltage detection technology, and discloses a frequency converter direct current voltage detection correction method, which solves the problem of short service life of a frequency converter caused by silver migration of a sampling circuit and improves user experience. In the invention, in the power-on initialization detection of the frequency converter, the detection value of the rear-end direct-current voltage is corrected according to the alternating-current voltage value detected by the front-end alternating-current half-wave detection circuit, and the voltage calculation coefficient is adjusted, so that the direct-current voltage detection basically conforms to the actual value after the PFC is started. And in a certain range of the detected voltage deviation, according to a set reliable working range, the frequency converter continuously works in the range, and when the reliable working range is about to be exceeded, the fault of the direct-current voltage detection circuit is reported to the outside, and maintenance is prompted. The invention can prolong the service life of the frequency converter, ensure the continuous work of the frequency converter within proper time, report failure prompt in advance and improve the use experience of users.
Description
Technical Field
The invention relates to a frequency converter voltage detection technology, in particular to a frequency converter direct-current voltage detection and correction method.
Background
The frequency converter is a device which provides the required power supply voltage according to the actual requirement of the motor, thereby achieving the purposes of energy saving and speed regulation. For an air conditioner, an inverter is a control system for controlling and adjusting the rotating speed of a compressor, so that the inverter is always in an optimal rotating speed state, and the energy efficiency ratio is improved. In order to monitor the working state of the frequency converter, the output voltage and the current of the frequency converter need to be detected, but once a sampling circuit in the prior art has a silver migration problem, the detection voltage has deviation or a fault is directly reported by mistake, so that the frequency converter does not work.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the frequency converter direct-current voltage detection and correction method solves the problem that the service life of a frequency converter is short due to silver migration of a sampling circuit, and improves user experience.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a frequency converter direct-current voltage detection and correction method is applied to a frequency converter direct-current voltage detection and correction system, wherein the correction system comprises a rectification circuit, a PFC circuit, a direct-current voltage detection circuit and an alternating-current half-wave detection circuit; the rectification circuit is connected with the PFC circuit; the alternating-current half-wave detection circuit is connected to the rear end of the rectification circuit, and the direct-current voltage detection circuit is connected to the rear end of the PFC circuit; the method comprises the following steps:
a. the frequency converter is electrified and standby, and an alternating current input voltage peak value VinAD is calculated according to the alternating current half-wave detection circuit; calculating a direct current voltage value V2AD according to the direct current voltage detection circuit;
b. performing arithmetic mean filtering on VinAD and V2AD within a set time period to respectively obtain AD1avg and AD2 avg;
c. converting the AD1avg into a theoretical direct-current voltage value V1, and converting the AD2avg into an actual direct-current voltage sampling value V2;
d. comparing | V2-V1| with Ve, if | V2-V1| is > Ve, calculating a direct current voltage correction coefficient K, wherein K is V2/V1, and entering the step e, otherwise, normally operating the frequency converter;
e. comparing Vm 0K with Vz, if Vm 0K is smaller than Vz, entering step f, otherwise, reporting an abnormal fault of the detection circuit, finishing the operation of the frequency converter, when Vm0 is the maximum input alternating current voltage or the maximum bus voltage of the PFC, the resistance value of the sampling circuit is the corresponding theoretical direct current voltage sampling value when the initial value is the resistance value of the sampling circuit, and Vz is the maximum operation input sampling voltage of the set sampling port;
f. comparing Vm0 xK with Vm1, and reporting the over-high warning information of the direct current detection voltage if Vm0 xK is not less than Vm 1; otherwise, the frequency converter normally operates, and Vm1 is a set sampling port direct-current voltage detection early warning value.
For further optimization, in step f, if Vm0 × K is greater than or equal to Vm1, reporting the dc detection voltage over-high warning information, but continuing to operate the frequency converter.
The invention has the beneficial effects that:
an alternating current half-wave detection circuit is added on an alternating current side, an alternating current voltage peak value is calculated through the circuit, and in the power-on standby stage, a sampling voltage value when silver migration occurs is corrected by combining a software voltage detection and correction method, so that the system can continuously and normally work, the service life of the circuit with the silver migration phenomenon is prolonged, the service life of the frequency converter is prolonged, the continuous work of the frequency converter is ensured within a proper time, a failure prompt is reported in advance, and the use experience of a user is improved.
Drawings
FIG. 1 is a flow chart of a method for detecting and correcting the DC voltage of a frequency converter according to the present invention;
FIG. 2 is a schematic circuit diagram of a DC voltage detection and correction system of the frequency converter;
the labels in the figure are: DB1 is a rectifier circuit, L1 is an inductor, D1 is a diode, C1 is a capacitor, R1-R8 are resistors, and V1 is a switch tube.
Detailed Description
The invention aims to provide a direct-current voltage detection and correction method for a frequency converter, which solves the problem of short service life of the frequency converter caused by silver migration of a sampling circuit and improves user experience. The core idea is as follows: the detection circuit only works in half-wave, the working effective voltage is low, Vin/2 is about 1/3 of direct-current voltage at the rear end of a rectifier bridge, and even if improper protection occurs, the probability of silver migration is lower. In the power-on initialization detection of the frequency converter, the detection value of the direct-current voltage at the rear end is corrected according to the alternating-current voltage value detected by the front-end alternating-current half-wave detection circuit, and the voltage calculation coefficient is adjusted, so that the direct-current voltage detection basically conforms to the actual value after the PFC is started. Within a certain range of the detected voltage deviation, according to a set reliable working range (within a chip voltage detection range), the frequency converter continuously works within the range, and when the reliable working range is about to be exceeded, the fault of the direct-current voltage detection circuit is reported to the outside, and maintenance is prompted. The invention can prolong the service life of the frequency converter, ensure the continuous work of the frequency converter in proper time, report failure prompt in advance and improve the use experience of users.
In specific implementation, the method for detecting and correcting the direct voltage of the frequency converter of the invention is applied to a system for detecting and correcting the direct voltage of the frequency converter, and as shown in fig. 2, the system for detecting and correcting the direct voltage of the frequency converter comprises a rectifying circuit, a PFC circuit, a direct voltage detection circuit and an alternating current half-wave detection circuit; the rectification circuit is connected with the PFC circuit; the alternating current half-wave detection circuit is connected to the rear end of the rectification circuit, and the direct current voltage detection circuit is connected to the rear end of the PFC circuit.
Specifically, the flow of the calibration method is shown in fig. 1, and the calibration method includes the following implementation steps:
1. the frequency converter is electrified and standby, and an alternating current input voltage peak value VinAD is calculated according to the alternating current half-wave detection circuit; calculating a direct current voltage value V2AD according to the direct current voltage detection circuit;
2. performing arithmetic mean filtering on VinAD and V2AD in a set time period to obtain AD1avg and AD2 avg;
3. converting AD1avg into a theoretical direct-current voltage value V1, and converting AD2avg into an actual direct-current voltage sampling value V2;
4. setting a voltage theoretical value and a normal deviation range Ve of a direct-current voltage sampling value by combining a rectifying circuit and a sampling circuit;
5. if the absolute value of V2-V1 is greater than Ve, namely V2-V1 exceed the normal deviation voltage, calculating a direct-current voltage correction coefficient K which is V2/V1, otherwise, normally operating;
6. when the maximum input alternating-current voltage or the maximum bus voltage of the PFC is set, the corresponding theoretical direct-current voltage sampling value is Vm0 when the resistance value of the sampling circuit is an initial value, the maximum operation input sampling voltage Vz of the sampling port of the control chip is set, if Vm 0K is smaller than Vz, the next step is carried out, otherwise, an abnormal fault of the detection circuit is reported, and the operation of the frequency converter is finished;
7. setting a direct-current voltage detection early warning value Vm1 of a detection port of a control chip, combining a direct-current voltage real-time sampling value Vx with Vm 0K when Vm0 is detected, reporting over-high direct-current detection voltage early warning information if Vx is not less than Vm1, and continuing to operate a frequency converter; and if Vx is less than Vm1, the frequency converter operates normally.
Repeating steps 1-7 for the initial power-up; and repeating the steps 6 and 7 during the electrification operation.
Example (b):
taking the application of the invention to a variable frequency air conditioner controller as an example, firstly, after the controller is electrified, the peak value VinAD of the AC input voltage is calculated at the standby time according to the AC voltage detection circuit; the DC voltage value V2AD is calculated according to a DC voltage detection circuit.
Then, the theoretical dc voltage value V1 and the dc voltage sampling value V2 are calculated according to the software control flow in fig. 1. And setting a voltage deviation range Ve, when the resistance value of the direct-current voltage sampling circuit of the air conditioner controller changes due to factors such as silver migration, calculating a direct-current voltage correction coefficient K if | V2-V1| is greater than Ve, otherwise, not calculating, and enabling the controller to normally operate.
Meanwhile, whether the port voltage is smaller than Vz under the theoretical direct-current voltage sampling condition is judged according to the set maximum input sampling voltage Vz of the sampling port, if so, the control is continued, and if so, the abnormal fault of the detection circuit is reported, and the controller stops running.
And then according to a set direct-current voltage detection early warning value Vm1, when Vm0 is the direct-current voltage real-time sampling value Vx is Vm 0K, the operation is continued if Vx is Vm1, if Vx is not less than Vm1, direct-current voltage detection over-high early warning information is reported, and when Vz is greater than Vx and not less than Vm1, the controller only reports the direct-current voltage detection over-high early warning information and runs normally.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A frequency converter direct-current voltage detection and correction method is applied to a frequency converter direct-current voltage detection and correction system and is characterized in that the correction system comprises a rectification circuit, a PFC circuit, a direct-current voltage detection circuit and an alternating-current half-wave detection circuit; the rectification circuit is connected with the PFC circuit; the alternating-current half-wave detection circuit is connected to the rear end of the rectification circuit, and the direct-current voltage detection circuit is connected to the rear end of the PFC circuit; the method comprises the following steps:
a. the frequency converter is electrified and standby, and an alternating current input voltage peak value VinAD is calculated according to the alternating current half-wave detection circuit; calculating a direct current voltage value V2AD according to the direct current voltage detection circuit;
b. performing arithmetic mean filtering on VinAD and V2AD within a set time period to respectively obtain AD1avg and AD2 avg;
c. converting the AD1avg into a theoretical direct-current voltage value V1, and converting the AD2avg into an actual direct-current voltage sampling value V2;
d. comparing | V2-V1| with Ve, Ve representing a set voltage deviation range, if | V2-V1| is > Ve, calculating a direct current voltage correction coefficient K, wherein K is V2/V1, entering the step e, otherwise, normally operating the frequency converter;
e. comparing Vm 0K with Vz, if Vm 0K is less than Vz, entering step f, otherwise, reporting an abnormal fault of the detection circuit, finishing the operation of the frequency converter, when Vm0 is the maximum input alternating current voltage or the maximum bus voltage of the PFC, the corresponding theoretical direct current voltage sampling value when the resistance value of the sampling circuit is the initial value, and Vz is the maximum operation input sampling voltage of the set sampling port;
f. comparing Vm0 xK with Vm1, and reporting the over-high warning information of the direct current detection voltage if Vm0 xK is not less than Vm 1; otherwise, the frequency converter normally operates, and Vm1 is a set sampling port direct-current voltage detection early warning value.
2. The method of detecting and correcting DC voltage of frequency converter according to claim 1,
in the step f, if Vm0 × K is not less than Vm1, reporting the over-high warning information of the direct current detection voltage, but continuing to operate the frequency converter.
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| CN104218786A (en) * | 2013-05-31 | 2014-12-17 | 浙江三花股份有限公司 | Power factor correction protecting method and equipment |
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| CN101738526B (en) * | 2008-11-21 | 2012-11-28 | 上海电机学院 | Direct current output voltage test circuit for power factor correction control circuit |
| CN201813314U (en) * | 2010-09-20 | 2011-04-27 | 石家庄国耀电子科技有限公司 | Alternating voltage sampling circuit of AC powered active power factor correction circuit |
| JP5696289B2 (en) * | 2010-11-18 | 2015-04-08 | パナソニックＩｐマネジメント株式会社 | Converter circuit |
| US9093860B2 (en) * | 2011-09-19 | 2015-07-28 | Schneider Electric It Corporation | Fault detection for parallel inverters system |
| CN104113199B (en) * | 2013-06-03 | 2018-03-16 | 广东美的制冷设备有限公司 | A kind of active PFC circuit and its control method |
| CN104656735B (en) * | 2014-12-19 | 2016-03-02 | 珠海格力电器股份有限公司 | The controling parameters control method of circuit of power factor correction and device and air conditioner |
| TWI601366B (en) * | 2016-06-03 | 2017-10-01 | 光寶電子（廣州）有限公司 | A power supply and voltage calibration method |
| CN111082651B (en) * | 2019-12-09 | 2021-02-23 | 珠海格力电器股份有限公司 | Circuit and method for diagnosing, correcting and recovering PFC bus abnormity |
| CN111865110B (en) * | 2020-08-13 | 2022-04-19 | 广州道一科学技术有限公司 | Electrophoresis power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104218786A (en) * | 2013-05-31 | 2014-12-17 | 浙江三花股份有限公司 | Power factor correction protecting method and equipment |
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