CN107328951B - Method for reducing measurement error of rotating speed of variable frequency compressor through frequency division measurement - Google Patents
Method for reducing measurement error of rotating speed of variable frequency compressor through frequency division measurement Download PDFInfo
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- CN107328951B CN107328951B CN201710716629.XA CN201710716629A CN107328951B CN 107328951 B CN107328951 B CN 107328951B CN 201710716629 A CN201710716629 A CN 201710716629A CN 107328951 B CN107328951 B CN 107328951B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a method for reducing measurement errors of the rotating speed of a variable frequency compressor by frequency division measurement, which is a method for measuring the rotating speed of the variable frequency compressor of an air conditioner and a refrigerator and realizes the measurement of the rotating speed of the compressor by detecting the frequency of any phase current in three-phase driving currents of the variable frequency compressor. The functions are as follows: detecting the current rotating speed of the variable frequency compressor and sending the detected rotating speed to the MCU; the rotating speed measuring method has the characteristics that the rotating speed of the variable frequency compressor at high rotating speed and low rotating speed can be accurately detected, and the rotating speed measuring error is reduced. The invention comprises a current transformer, an operational amplifier module circuit, a high-frequency filter circuit, a low-frequency filter circuit, a comparator module circuit and an MCU.
Description
Technical Field
The invention belongs to the technical field of variable frequency compressors, and particularly relates to a method for reducing measurement errors of the rotating speed of a variable frequency compressor through frequency division measurement.
Background
At present, the frequency conversion compressor driving mode of air conditioners and refrigerators mostly adopts a sine wave driving mode, when the compressor is driven to run at a low rotating speed, the current waveform is very poor, the current amplitude is small, the interference is great, the measurement of the conventional frequency conversion compressor rotating speed measuring method is inaccurate, and the error is very large, so the method is specially provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for reducing the measurement error of the rotating speed of the inverter compressor by frequency division measurement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for reducing the rotating speed measurement error of a variable frequency compressor through frequency division measurement comprises a current transformer, wherein the input end of the current transformer is connected with a variable frequency compressor body, the output end of the current transformer is electrically connected with an operational amplifier module circuit, the output end of the operational amplifier module circuit is respectively electrically connected with a high-frequency filter circuit and a low-frequency filter circuit, and the output ends of the high-frequency filter circuit and the low-frequency filter circuit are both electrically connected with a ratio; the comparator module circuit, and the output end of the comparator module circuit is electrically connected with MCU;
the current transformer is used for collecting a driving current signal of the variable frequency compressor;
the operational amplifier module circuit is used for amplifying an input current signal;
the high-frequency filter circuit is used for carrying out high-frequency filtering on the amplified current signal;
the low-frequency filter circuit is used for carrying out low-frequency filtering on the amplified current signal;
the comparator module circuit is used for comparing the high-frequency filtered signal and the low-frequency filtered signal with 2.5V voltage respectively and outputting waveforms.
Preferably, the two break ports of the MCU are configured to receive the voltage signals respectively subjected to the comparison, and determine whether the frequency of the voltage signal is higher than or equal to 120Hz (three-pair compressor), and output the rotation speed after high-frequency filtering, comparison and conversion, and if the frequency of the voltage signal is lower than 120Hz (three-pair compressor), output the rotation speed after low-frequency filtering, comparison and conversion.
The invention has the technical effects and advantages that: compared with the prior art, the method for reducing the rotating speed measurement error of the variable frequency compressor through frequency division measurement is simple and reasonable in structural design, convenient to operate, time-saving, labor-saving, safe, stable, wide in application range and beneficial to popularization, and the rotating speed measurement error of the variable frequency compressor is effectively reduced.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of a current signal collected by the current transformer of the present invention;
FIG. 3 is a circuit diagram of an operational amplifier module circuit according to the present invention;
FIG. 4 is a circuit diagram of a high frequency filter circuit according to the present invention;
FIG. 5 is a circuit diagram of a low frequency filter circuit according to the present invention;
FIG. 6 is a schematic diagram of a working circuit module of the MCU of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the method for reducing the measurement error of the rotating speed of the inverter compressor through frequency division measurement includes a current transformer, an operational amplifier module circuit, a high-frequency filter circuit, a low-frequency filter circuit, a comparator module circuit, and an MCU, and the detection method needs to be connected with an inverter driving control board and a corresponding compressor;
as shown in fig. 2, the current transformer is used for collecting a driving current signal of the inverter compressor;
as shown in fig. 3, the operational amplifier module circuit amplifies the current signal collected by the current transformer;
as shown in fig. 4, in the high-frequency filter circuit, a signal amplified by the operational amplifier passes through a short _2 resistor and an RC filter circuit of a C7 capacitor and then is input to an inverting input terminal of the comparator, and is compared with a voltage divided by R6 and R17 to obtain a pulse square wave signal;
as shown in fig. 5, in the low-frequency filter circuit, a signal amplified by the operational amplifier passes through a short _1 resistor and an RC filter circuit of an EC3 capacitor and then is input to an inverting input terminal of the comparator, and is compared with a voltage divided by R5 and R16 to obtain a pulse square wave signal;
as shown in fig. 6, the two break ports of the MCU are used to receive the pulse square wave signals after comparison, and determine whether the frequency of the pulse signal is higher than or equal to 120Hz (three-pair compressor), then output the rotation speed after high frequency filtering, comparison and conversion, and if the frequency of the voltage signal is lower than 120Hz (three-pair compressor), then output the rotation speed after low frequency filtering, comparison and conversion.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (1)
1. The utility model provides a method for realize reducing inverter compressor rotational speed measuring error through frequency division measurement, includes current transformer, and current transformer's input is connected inverter compressor body, its characterized in that: the output end of the current transformer is electrically connected with an operational amplifier module circuit, the output end of the operational amplifier module circuit is respectively electrically connected with a high-frequency filter circuit and a low-frequency filter circuit, the output ends of the high-frequency filter circuit and the low-frequency filter circuit are both electrically connected with a comparator module circuit, and the output end of the comparator module circuit is electrically connected with an MCU;
the current transformer is used for collecting a driving current signal of the variable frequency compressor;
the operational amplifier module circuit is used for amplifying an input current signal;
the high-frequency filter circuit is used for carrying out high-frequency filtering on the amplified current signal;
the low-frequency filter circuit is used for carrying out low-frequency filtering on the amplified current signal;
the comparator module circuit is used for comparing the high-frequency filtered signal and the low-frequency filtered signal with 2.5V voltage respectively and outputting a waveform;
and the two break ports of the MCU are used for receiving the voltage signals which are respectively compared, and outputting the rotating speed which is subjected to high-frequency filtering, comparison and conversion if the frequency of the voltage signals is judged to be higher than or equal to 120Hz, and outputting the rotating speed which is subjected to low-frequency filtering, comparison and conversion if the frequency of the voltage signals is smaller than 120 Hz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710716629.XA CN107328951B (en) | 2017-08-21 | 2017-08-21 | Method for reducing measurement error of rotating speed of variable frequency compressor through frequency division measurement |
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| CN201710716629.XA CN107328951B (en) | 2017-08-21 | 2017-08-21 | Method for reducing measurement error of rotating speed of variable frequency compressor through frequency division measurement |
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| CN107328951A CN107328951A (en) | 2017-11-07 |
| CN107328951B true CN107328951B (en) | 2020-01-17 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11719213B2 (en) * | 2019-10-22 | 2023-08-08 | Illinois Tool Works Inc. | Systems and methods for preventing activation of a starter based on engine speed |
| CN114531137B (en) * | 2022-02-24 | 2022-08-05 | 中国科学院空间应用工程与技术中心 | Rotating speed signal acquisition method and device based on frequency division digital filtering and storage medium |
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