CN103293358A - Current detecting module for variable-frequency speed controller - Google Patents
Current detecting module for variable-frequency speed controller Download PDFInfo
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- CN103293358A CN103293358A CN2013101463932A CN201310146393A CN103293358A CN 103293358 A CN103293358 A CN 103293358A CN 2013101463932 A CN2013101463932 A CN 2013101463932A CN 201310146393 A CN201310146393 A CN 201310146393A CN 103293358 A CN103293358 A CN 103293358A
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- frequency speed
- speed controller
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Abstract
The invention discloses a current detecting module for a variable-frequency speed controller. The current detecting module for the variable-frequency speed controller comprises an optoelectronic isolation circuit. The current detecting module for the variable-frequency speed controller is characterize in that one end of the optoelectronic isolation circuit is connected with the output end of the variable-frequency speed controller through a current collecting circuit, the other end of the optoelectronic isolation circuit is connected with a control board of the variable-frequency speed controller through a signal processing circuit, the optoelectronic isolation circuit is further and respectively connected with a first power circuit and a second power circuit, and the signal processing circuit is connected with the second power circuit. The current detecting module for the variable-frequency speed controller is mainly used for current detection of variable-frequency speed controllers.
Description
Technical field
The present invention relates to a kind of current detection module, relate in particular to a kind of variable-frequence governor current detection module.
Background technology
The output current of variable-frequence governor is very crucial in a variable-frequence governor signal detection system parameter, and it has participated directly in the control algolithm of variable-frequence governor, and the accuracy that current signal detects has determined the performance of variable-frequence governor.
At present to detect all be at the variable-frequence governor output terminal Hall element to be installed to the output current of variable-frequence governor, the induction current that changes is converted to delivers to control panel behind the voltage signal and handle.This mode precision height, good reliability, but this mode cost height, structure relative complex, for cost and the not too responsive high-power frequency conversion speed regulator of structure index, installing Hall element additional is acceptable, but for the low power frequency conversion speed regulator, the expense of cost is just too high.Therefore, adopting simple low cost current acquisition scheme to substitute Hall element is a kind of extraordinary selection.
Summary of the invention
The object of the present invention is to provide a kind of variable-frequence governor to solve the expensive problem of traditional current detecting with current detection module.
For achieving the above object, technical solution of the present invention is: a kind of variable-frequence governor current detection module, comprise photoelectric isolating circuit, it is characterized in that: an end of described photoelectric isolating circuit links to each other with the variable-frequence governor output terminal by the current acquisition circuit, the other end links to each other with the variable-frequence governor control panel by signal conditioning circuit, photoelectric isolating circuit also links to each other with power circuit 2 with power circuit 1 respectively, and signal conditioning circuit links to each other with power circuit 2.
The invention has the beneficial effects as follows: by the redesign to current detection module, not only realized substituting with current detection module cheaply the problem of expensive Hall element, reduced the structure complexity of variable-frequence governor system simultaneously.
Description of drawings
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is electrical schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention and embodiment thereof are described in further detail.
Referring to Fig. 1-2, the present invention includes photoelectric isolating circuit, it is characterized in that: an end of described photoelectric isolating circuit links to each other with the variable-frequence governor output terminal by the current acquisition circuit, the other end links to each other with the variable-frequence governor control panel by signal conditioning circuit, photoelectric isolating circuit also links to each other with power circuit 2 with power circuit 1 respectively, and signal conditioning circuit links to each other with power circuit 2.
Any one of the three-phase output of Ui and variable-frequence governor links to each other, and photoelectric isolating device U2 passes through resistance R 1, R2 links to each other with Ui.Milliohm level resistance R 1 be series at variable-frequence governor any one mutually output in the middle of, play the effect of variable-frequence governor output current sampling, the current signal of variable-frequence governor output is converted into the mV magnitude voltage signals by sampling resistor R1, and this voltage signal is incorporated into the in-phase signal input end of U2 through R2.Capacitor C 3 is decoupling capacitor, the interference component in the filtering voltage signal.
Link to each other with the ground end of power circuit 1 behind the inverting input 3 of photoelectric isolating device U2 and the 4 end short circuits, 1 pin of U2 links to each other with the output terminal of power circuit 1.Therefore, photoelectric isolating circuit adopts the homophase input pattern, and photoelectric isolating circuit links to each other with signal conditioning circuit by differential signal of 7,8 pin output of U2, and 8,5 pin of U2 link to each other with power circuit 2.
Photoelectric isolating circuit self possesses amplification is arranged, and is the high impedance input, by the undistorted transmission mV level AC and DC signal of opto-electronic conversion energy, through exporting differential signal after the amplification of self as the input signal of signal conditioning circuit.
U3 is operational amplifier, form signal conditioning circuit with resistance R 3-R8 and capacitor C 4, C5, C6, the in-phase end of operational amplifier links to each other with the output port 6,7 of isolating amplifier circuit with R4 by R3 respectively with end of oppisite phase, the output terminal of signal conditioning circuit links to each other with the variable-frequence governor control panel, and the power port of operational amplifier U3 links to each other with power circuit 2.
Signal conditioning circuit is enlarged into the volt magnitude voltage signals that variable-frequence governor control panel controller allows with the millivolt level differential voltage signal process of photoelectric isolating circuit output, simultaneously because the isolation features of operational amplifier itself, input/output signal is isolated again, prevent crosstalking mutually of input and output level, decoupling by capacitor C 6 in addition, signal conditioning circuit are exported the current signal treatment circuit that glitch-free signal IO delivers in the variable-frequence governor control panel and are handled again.
The function of freely adjusting signal conditioning circuit output voltage multiple is played in resistance R 5 and R6 series connection, R7 and R8 series connection, thereby has realized the requirement of the corresponding different amplification of different capacity variable-frequence governor.C4 and C5 play the effect of decoupling, have avoided because the influence that the intervention of disturbing pulse causes enlargement factor.
Integrated package U1, C1, C2 have constituted power circuit 1, and the input end of U1 links to each other with the 15V power supply, and the voltage of output links to each other with the former limit energization pins of U2, and common port links to each other with variable-frequence governor.
Because the power supply separately of the former limit of photoelectric isolating circuit and the power supply of secondary, so power circuit 1 mainly plays the function to the photoelectric isolating circuit power supply.
C1 and C2 play the function of filtering high-frequency harmonic, prevent that the interference in the power supply from causing the photoelectric isolating circuit operation irregularity.
Power circuit 2 provides power supply for the secondary of the U2 of photoelectric isolating circuit and the U3 of signal conditioning circuit.
Claims (1)
1. variable-frequence governor current detection module, comprise photoelectric isolating circuit, it is characterized in that: an end of described photoelectric isolating circuit links to each other with the variable-frequence governor output terminal by the current acquisition circuit, the other end links to each other with the variable-frequence governor control panel by signal conditioning circuit, photoelectric isolating circuit also links to each other with power circuit 2 with power circuit 1 respectively, and signal conditioning circuit links to each other with power circuit 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101463932A CN103293358A (en) | 2013-04-25 | 2013-04-25 | Current detecting module for variable-frequency speed controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101463932A CN103293358A (en) | 2013-04-25 | 2013-04-25 | Current detecting module for variable-frequency speed controller |
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| Publication Number | Publication Date |
|---|---|
| CN103293358A true CN103293358A (en) | 2013-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101463932A Pending CN103293358A (en) | 2013-04-25 | 2013-04-25 | Current detecting module for variable-frequency speed controller |
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| CN (1) | CN103293358A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113774Y (en) * | 2007-07-20 | 2008-09-10 | 湖南沃森电气科技有限公司 | Frequency converter electrical current sampling circuit module |
| CN201877999U (en) * | 2010-12-07 | 2011-06-22 | 上海格立特电力电子有限公司 | Current sampling circuit of frequency converter |
| WO2012113455A1 (en) * | 2011-02-25 | 2012-08-30 | Abb Technology Ag | A method for obtaining an instantaneous direct current value, and control device |
| DE102011080587A1 (en) * | 2011-08-08 | 2013-02-14 | Lenze Se | Method of measuring an analogue signal generated by a frequency converter |
| CN102998502A (en) * | 2012-12-06 | 2013-03-27 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN203216975U (en) * | 2013-04-25 | 2013-09-25 | 湘煤立达矿山装备股份有限公司 | Current detection module for frequency converter |
-
2013
- 2013-04-25 CN CN2013101463932A patent/CN103293358A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113774Y (en) * | 2007-07-20 | 2008-09-10 | 湖南沃森电气科技有限公司 | Frequency converter electrical current sampling circuit module |
| CN201877999U (en) * | 2010-12-07 | 2011-06-22 | 上海格立特电力电子有限公司 | Current sampling circuit of frequency converter |
| WO2012113455A1 (en) * | 2011-02-25 | 2012-08-30 | Abb Technology Ag | A method for obtaining an instantaneous direct current value, and control device |
| DE102011080587A1 (en) * | 2011-08-08 | 2013-02-14 | Lenze Se | Method of measuring an analogue signal generated by a frequency converter |
| CN102998502A (en) * | 2012-12-06 | 2013-03-27 | 陈实 | High-isolation voltage-resisting bidirectional signal sensor |
| CN203216975U (en) * | 2013-04-25 | 2013-09-25 | 湘煤立达矿山装备股份有限公司 | Current detection module for frequency converter |
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Application publication date: 20130911 |