CN104197964A - Current waveform/rectangular pulse conversion circuit device - Google Patents
Current waveform/rectangular pulse conversion circuit device Download PDFInfo
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- CN104197964A CN104197964A CN201410442824.4A CN201410442824A CN104197964A CN 104197964 A CN104197964 A CN 104197964A CN 201410442824 A CN201410442824 A CN 201410442824A CN 104197964 A CN104197964 A CN 104197964A
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- pass filter
- current waveform
- active low
- capacitor
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Abstract
The invention discloses a current waveform/rectangular pulse conversion circuit device which comprises an active low-pass filter (1), a capacitor switching circuit (2) and a direct-current removing shaping circuit (3). When the circuit device works, the active low-pass filter is used for filtering more than secondary harmonic waves in a current waveform provided by a waveform acquisition circuit, the direct-current removing shaping circuit is used for removing direct-current components in the current waveform and shaping the current waveform into pulse square waves to be outputted, and the capacitor switching circuit is controlled by a computer and used for reducing or increasing the cut-off frequency of the active low-pass filter by switching on or off a capacitor C3 when a motor starts, stalls or runs at a constant speed to overcome the shortcoming that more than secondary harmonic waves run over degraded pulse square waves due to working change of the motor. By converting the current waveform into the pulse square waves, the conversion circuit device achieves the purposes of cost reduction and reliable counting.
Description
Technical field
The present invention relates to a kind of circuit arrangement, specifically refer to and gather the current fluctuation signal that has brushless motor rotor, and be treated to pulse square wave output, for a kind of current waveform/rect.p. conversion circuit device that the number of turns of rotor rotation is counted.
Background technology
Automotive window adopts and carrys out elevating glass by the drive motor of computer control, and the drive motor of lift car glass for vehicle window, for there being brushless motor, is called for short motor; When glass for vehicle window is done vertical motion, between edge on glass and window frame, can clamp the danger of staff, the number of people or other objects because accidentally putting in, have report child dead because head puts in the glass clamp that vehicle window closed.For this reason, American-European standard regulation, glass for vehicle window occurs in 4～200 millimeters under window frame that object is pressed from both sides when automatic-ascending and should automatically decline, caught object, comprises that the suffered pressure of human body must be less than 100 newton, thereby unlikely human body is damaged.Ensure that glass for vehicle window has pinch resistant functionality and just must detect the position of glass in regulation region, the position that detect glass needs the lap signal feedback to the computer of rotor rotation, is counted to process control motor execution again by computer.Angle number to rotor rotation is counted, and is called for short corner counting; Offer computer and carry out the circuit arrangement that corner counting processes and be called conversion circuit device for the physical quantity of rotor rotation being converted to electric pulse.Prior art has two kinds for the conversion circuit device of automotive window drive motor corner counting, and one is current type, and another kind is Hall-type; So-called current type, is that current fluctuation rotor rotation being produced by waveform acquisition circuit 01 is converted to current waveform signal, and directly current waveform signal is offered to computer and carry out corner counting and process; Due to current waveform complicated, in waveform, be superimposed with DC component and higher hamonic wave more than secondary, therefore detect primitive period tens of points of difficulties, cause the error of corner counting large, error accumulation is high, and it is unreliable to count; The advantage of current type is that cost is low, and inferior position is poor reliability; What is called Hall-type, is to adopt the inner Hall that is provided with Hall circuit to have brushless motor, is called for short hall electric machine, by the corner amount of rotor, is converted to pulse square wave through Hall circuit, through ad hoc feeder line, pulse square wave is offered to computer and carries out the processing of corner counting; The advantage of Hall-type is that reliability is high, and inferior position is that cost is high; Therefore there are the problems and shortcomings of the high or poor reliability of cost in prior art.
Summary of the invention
The problems and shortcomings that exist for above-mentioned prior art, the present invention adopts by active low-pass filter, electric capacity commutation circuit and the circuit arrangement that goes direct current shaping circuit to form, when work, the above harmonic filtration of secondary in current waveform waveform acquisition circuit being provided by active low-pass filter, by going direct current shaping circuit that pulse square wave output is removed and be shaped as to the DC component in current waveform; Electric capacity commutation circuit is subject to computer control, when being used at electric motor starting, stall or at the uniform velocity turning round, by being switched on or switched off, capacitor C 3 reduces or the cutoff frequency of rising active low-pass filter, change the technical scheme that causes the above harmonic wave of secondary to overflow deteriorated pulse square wave to overcome because of the work of motor, a kind of current waveform/rect.p. conversion circuit device is provided, be intended to, by current waveform is converted to pulse square wave, conversion circuit device is reached and reduce costs, count reliable object.
The object of the present invention is achieved like this: a kind of current waveform/rect.p. conversion circuit device, comprise active low-pass filter, electric capacity commutation circuit and remove direct current shaping circuit, wherein: described active low-pass filter is made up of operational amplifier U1, capacitor C 1, capacitor C 2, resistance R 2, resistance R 3, resistance R 4, resistance R 5;
Described electric capacity commutation circuit is made up of transistor Q1, capacitor C 3, resistance R 8, resistance R 9;
The described direct current shaping circuit that goes is made up of operational amplifier U2, capacitor C 4, resistance R 6, resistance R 7;
The upper end of the upper end of the described capacitor C 3 of electric capacity commutation circuit and the described capacitor C 2 of active low-pass filter also connects; The output terminal of the described operational amplifier U1 of active low-pass filter is connected with the left end of the described capacitor C 4 of removing direct current shaping circuit.
Principle of work and beneficial effect
When application, the left end of the described resistance R 2 of active low-pass filter is connected with the upper end of the resistance R 1 of waveform acquisition circuit, go the output terminal of the described operational amplifier U2 of direct current shaping circuit to be connected with computer input port, the left end of the described resistance R 8 of electric capacity commutation circuit is connected with computer control port MCU_CAP.
When work, the above harmonic filtration of secondary in the current waveform that active low-pass filter provides waveform acquisition circuit, the current waveform of the above harmonic wave of filtering secondary is coupled into direct current shaping circuit through described capacitor C 4, described capacitor C 4 is removed the DC component in current waveform, goes direct current shaping circuit that the current waveform of removing DC component is shaped as to pulse square wave output;
In the time of electric motor starting, computer control port MCU_CAP exports high level, make the described transistor Q1 saturation conduction of electric capacity commutation circuit, described capacitor C 3 is in parallel with the described capacitor C 2 of active low-pass filter, active low-pass filter determines that the equivalent electric capacity of cutoff frequency height increases, and the cutoff frequency of active low-pass filter reduces, when eliminating because of electric motor starting, the distortion of current waveform, causes the above harmonic wave of secondary to overflow active low-pass filter and causes the deteriorated of pulse square wave;
Equally, in the time that motor is obstructed, as there is staff and pressed from both sides, current of electric increases, MCU detects excess current, and computer control port MCU_CAP exports high level, and C3 is in parallel with C2, reduce the cutoff frequency of active low-pass filter, to ensure that the above harmonic wave of secondary in current waveform is now by correctly filtering;
When machine operation is in the time at the uniform velocity turning round, computer control port MCU_CAP output low level, make the described transistor Q1 cut-off of electric capacity commutation circuit, described capacitor C 3 disconnects with active low-pass filter, active low-pass filter equivalent electric capacity is reduced to described capacitor C 2, the cutoff frequency of active low-pass filter raises, to optimize the pulse square wave through going the output of direct current shaping circuit.
Operational amplifier U2 works in open loop magnifying state, because operational amplifier U2 open-loop gain is very high, enlargement ratio is 1,000,000 times of magnitudes, and input need only several microvolt voltage differences just can make to be output as 0 or reach supply voltage level, is therefore easy to form good rect.p..
This apparatus structure is simple, and cost is low, reliable operation, and the pulse square wave of output equals to Hall square wave, is used in the conversion circuit device of automotive window drive motor corner counting, has reduced cost, has improved reliability.
Above-mentioned, the present invention adopts by active low-pass filter, electric capacity commutation circuit and the circuit arrangement that goes direct current shaping circuit to form, when work, the above harmonic filtration of secondary in current waveform waveform acquisition circuit being provided by active low-pass filter, by going direct current shaping circuit that pulse square wave output is removed and be shaped as to the DC component in current waveform, electric capacity commutation circuit is subject to computer control, be used at electric motor starting, stall or while at the uniform velocity turning round, by being switched on or switched off, capacitor C 3 reduces or the cutoff frequency of rising active low-pass filter, change the technical scheme that causes the above harmonic wave of secondary to overflow deteriorated pulse square wave to overcome because of the work of motor, the problems and shortcomings that prior art exists the high or poor reliability of cost are overcome, a kind of current waveform/rect.p. the conversion circuit device providing, by current waveform is converted to pulse square wave, conversion circuit device has been reached to reducing costs, count reliable object.
Brief description of the drawings
Fig. 1 is the structure block diagram of a kind of current waveform/rect.p. conversion circuit device of the present invention;
Fig. 2 is the circuit theory schematic diagram of a kind of current waveform/rect.p. conversion circuit device of the present invention;
Fig. 3 is a kind of current waveform/rect.p. conversion circuit device of the present invention, and the oscillograph that is operated in electric motor starting tense is observed sectional drawing;
Fig. 4 is a kind of current waveform/rect.p. conversion circuit device of the present invention, and the oscillograph that is operated in motor rotation blockage tense is observed sectional drawing;
Fig. 5 is a kind of current waveform/rect.p. conversion circuit device of the present invention, is operated in the at the uniform velocity oscillograph observation sectional drawing of tense of motor.
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but should not be construed as any limitation of the invention.
In figure: active low-pass filter 1, electric capacity commutation circuit 2, go direct current shaping circuit 3, waveform acquisition circuit 01, computer control port MCU_CAP, output OUT, Hall according to the current waveform 03 of square wave 02, motor, the pulse square wave 04 of output.
Embodiment
Consult Fig. 1～Fig. 5, a kind of current waveform/rect.p. conversion circuit device of the present invention, comprise active low-pass filter 1, electric capacity commutation circuit 2 and remove direct current shaping circuit 3, wherein: described active low-pass filter 1 is made up of operational amplifier U1, capacitor C 1, capacitor C 2, resistance R 2, resistance R 3, resistance R 4, resistance R 5;
Described electric capacity commutation circuit 2 is made up of transistor Q1, capacitor C 3, resistance R 8, resistance R 9;
The described direct current shaping circuit 3 that goes is made up of operational amplifier U2, capacitor C 4, resistance R 6, resistance R 7;
The upper end of the upper end of the described capacitor C 3 of electric capacity commutation circuit 2 and the described capacitor C 2 of active low-pass filter 1 also connects; The output terminal of the described operational amplifier U1 of active low-pass filter 1 is connected with the left end of the described capacitor C 4 of removing direct current shaping circuit 3.
Principle of work and beneficial effect
When application, the left end of the described resistance R 2 of active low-pass filter 1 is connected with the upper end of the resistance R 1 of waveform acquisition circuit 01, go the output terminal of the described operational amplifier U2 of direct current shaping circuit 3 to be connected with computer input port, the left end of the described resistance R 8 of electric capacity commutation circuit 2 is connected with computer control port MCU_CAP.
When work, the above harmonic filtration of secondary in the current waveform that active low-pass filter 1 provides waveform acquisition circuit 01, the current waveform of the above harmonic wave of filtering secondary is coupled into direct current shaping circuit 3 through described capacitor C 4, described capacitor C 4 is removed the DC component in current waveform, goes direct current shaping circuit 3 that the current waveform of removing DC component is shaped as to pulse square wave output;
In the time of electric motor starting, computer control port MCU_CAP exports high level, make the described transistor Q1 saturation conduction of electric capacity commutation circuit 2, described capacitor C 3 is in parallel with the described capacitor C 2 of active low-pass filter 1, active low-pass filter 1 determines that the equivalent electric capacity of cutoff frequency height increases, and the cutoff frequency of active low-pass filter 1 reduces, when eliminating because of electric motor starting, the distortion of current waveform, causes the above harmonic wave of secondary to overflow active low-pass filter 1 and causes the deteriorated of pulse square wave;
Equally, in the time that motor is obstructed, as there is staff and pressed from both sides, current of electric increases, MCU detects excess current, and computer control port MCU_CAP exports high level, and C3 is in parallel with C2, reduce the cutoff frequency of active low-pass filter 1, to ensure that the above harmonic wave of secondary in current waveform is now by correctly filtering;
When machine operation is in the time at the uniform velocity turning round, computer control port MCU_CAP output low level, make the described transistor Q1 cut-off of electric capacity commutation circuit 2, described capacitor C 3 disconnects with active low-pass filter 1, active low-pass filter 1 equivalent electric capacity is reduced to described capacitor C 2, the cutoff frequency of active low-pass filter 1 raises, to optimize the pulse square wave through going direct current shaping circuit 3 to export.
Operational amplifier U2 works in open loop magnifying state, because operational amplifier U2 open-loop gain is very high, enlargement ratio is 1,000,000 times of magnitudes, and input need only several microvolt voltage differences just can make to be output as 0 or reach supply voltage level, is therefore easy to form good rect.p..
This apparatus structure is simple, and cost is low, reliable operation, and the pulse square wave of output equals to Hall square wave, is used in the conversion circuit device of automotive window drive motor corner counting, has reduced cost, has improved reliability.
Claims (1)
1. current waveform/rect.p. conversion circuit device, comprise active low-pass filter (1), electric capacity commutation circuit (2) and remove direct current shaping circuit (3), it is characterized in that: described active low-pass filter (1) is made up of operational amplifier U1, capacitor C 1, capacitor C 2, resistance R 2, resistance R 3, resistance R 4, resistance R 5;
Described electric capacity commutation circuit (2) is made up of transistor Q1, capacitor C 3, resistance R 8, resistance R 9;
The described direct current shaping circuit (3) that goes is made up of operational amplifier U2, capacitor C 4, resistance R 6, resistance R 7;
The upper end of the described capacitor C 2 of the upper end of the described capacitor C 3 of electric capacity commutation circuit (2) and active low-pass filter (1) also connects; The output terminal of the described operational amplifier U1 of active low-pass filter (1) is connected with the left end of the described capacitor C 4 of removing direct current shaping circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410442824.4A CN104197964A (en) | 2014-08-26 | 2014-08-26 | Current waveform/rectangular pulse conversion circuit device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410442824.4A CN104197964A (en) | 2014-08-26 | 2014-08-26 | Current waveform/rectangular pulse conversion circuit device |
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| CN104197964A true CN104197964A (en) | 2014-12-10 |
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| CN201410442824.4A Pending CN104197964A (en) | 2014-08-26 | 2014-08-26 | Current waveform/rectangular pulse conversion circuit device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569816A (en) * | 2014-12-25 | 2015-04-29 | 延锋伟世通电子科技（上海）有限公司 | Detection circuit for vehicle-mounted direct-current motor |
| CN113309512A (en) * | 2021-05-25 | 2021-08-27 | 吉林大学 | Erosion-resistant corrosion-resistant hard alloy mud pulse generator rotor and preparation method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073279A (en) * | 1991-12-14 | 1993-06-16 | 欧林巴斯光学工业股份有限公司 | Non-laser type scanister and method |
| JP2003009585A (en) * | 2001-06-20 | 2003-01-10 | Aisin Seiki Co Ltd | Detector for revolution of direct-current motor |
| JP2008283762A (en) * | 2007-05-09 | 2008-11-20 | Aisin Seiki Co Ltd | Ripple detector for direct-current motors, motor rotational position sensor, and ripple detection method |
| CN101953073A (en) * | 2008-01-18 | 2011-01-19 | 松下电器产业株式会社 | Ramp wave output circuit, analog/digital conversion circuit, and camera |
| CN102004166A (en) * | 2010-09-17 | 2011-04-06 | 杭州正强电子技术有限公司 | Measuring device and method of rotating speed of brush motor |
| CN103344779A (en) * | 2013-05-09 | 2013-10-09 | 重庆南方数控设备有限责任公司 | Apparatus and method for obtaining rotating speed of direct-current motor for driving peristaltic pump |
| CN203422057U (en) * | 2013-08-01 | 2014-02-05 | 北京经纬恒润科技有限公司 | Car window motor position detection circuit |
| CN103688460A (en) * | 2011-03-14 | 2014-03-26 | 提爱思科技股份有限公司 | Ripple extraction device, motor control apparatus, vehicle seat, and ripple extraction method |
| CN204027580U (en) * | 2014-08-26 | 2014-12-17 | 宁波双林汽车部件股份有限公司 | A kind of current waveform/rect.p. conversion circuit device |
-
2014
- 2014-08-26 CN CN201410442824.4A patent/CN104197964A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073279A (en) * | 1991-12-14 | 1993-06-16 | 欧林巴斯光学工业股份有限公司 | Non-laser type scanister and method |
| JP2003009585A (en) * | 2001-06-20 | 2003-01-10 | Aisin Seiki Co Ltd | Detector for revolution of direct-current motor |
| JP2008283762A (en) * | 2007-05-09 | 2008-11-20 | Aisin Seiki Co Ltd | Ripple detector for direct-current motors, motor rotational position sensor, and ripple detection method |
| CN101953073A (en) * | 2008-01-18 | 2011-01-19 | 松下电器产业株式会社 | Ramp wave output circuit, analog/digital conversion circuit, and camera |
| CN102004166A (en) * | 2010-09-17 | 2011-04-06 | 杭州正强电子技术有限公司 | Measuring device and method of rotating speed of brush motor |
| CN103688460A (en) * | 2011-03-14 | 2014-03-26 | 提爱思科技股份有限公司 | Ripple extraction device, motor control apparatus, vehicle seat, and ripple extraction method |
| CN103344779A (en) * | 2013-05-09 | 2013-10-09 | 重庆南方数控设备有限责任公司 | Apparatus and method for obtaining rotating speed of direct-current motor for driving peristaltic pump |
| CN203422057U (en) * | 2013-08-01 | 2014-02-05 | 北京经纬恒润科技有限公司 | Car window motor position detection circuit |
| CN204027580U (en) * | 2014-08-26 | 2014-12-17 | 宁波双林汽车部件股份有限公司 | A kind of current waveform/rect.p. conversion circuit device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569816A (en) * | 2014-12-25 | 2015-04-29 | 延锋伟世通电子科技（上海）有限公司 | Detection circuit for vehicle-mounted direct-current motor |
| CN113309512A (en) * | 2021-05-25 | 2021-08-27 | 吉林大学 | Erosion-resistant corrosion-resistant hard alloy mud pulse generator rotor and preparation method thereof |
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Application publication date: 20141210 |