CN206671826U - Brshless DC motor AC signal real-time sampling system - Google Patents
Brshless DC motor AC signal real-time sampling system Download PDFInfo
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- CN206671826U CN206671826U CN201720318149.3U CN201720318149U CN206671826U CN 206671826 U CN206671826 U CN 206671826U CN 201720318149 U CN201720318149 U CN 201720318149U CN 206671826 U CN206671826 U CN 206671826U
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Abstract
The utility model brshless DC motor AC signal real-time sampling system belongs to signal real-time sampling technical field；The brshless DC motor AC signal real-time sampling system includes：Hall current sensing circuit, the phase current signal in brushless DC motor control system is sampled, and the voltage of corresponding ratio is exported by voltage follower；Signal pre-processing circuit, the voltage magnitude exported from Hall current sensing circuit is biased, i.e., voltage magnitude is amplified or reduced；Reference circuit is calibrated, the signal value of multi collect is calibrated for error, calibrated collection signal gathers through ADC, carries out data convert and error compensation, realizes different closed-loop controls；DSP2812 control system modules, for completing analog-to-digital conversion and error compensation；The utility model brshless DC motor AC signal real-time sampling system, bipolar analog signal and the unmatched problem of ADC inside DSP2812 are not only solved, while the higher sampled result of precision can be obtained.
Description
Technical field
The utility model brshless DC motor AC signal real-time sampling system belongs to signal real-time sampling technical field.
Background technology
, it is necessary to which inputting the analog signal that DSP is handled mainly has two classes in brushless DC motor control system：Monopole
Property analog signal and bipolar analog signal.Unipolarity analog signal mainly has the bus voltage signal after sensor is changed
With bus current signal, its amplitude is all higher than 0；Bipolar analog signal is mainly the electric machine phase current letter after sensor is changed
Number, its amplitude carries out positive and negative alternately change according to conducting relation.
At present, in brushless DC motor control system, the collection to electric current carries out electric current more in the form of dc bus
Feedback closed loop controls, due to dc bus be the backflow of each phase current of motor must through circuit, cause harmonic wave in the electric current of collection to contain
Amount is abundant, and the problem of fly-wheel diode freewheel current flows through be present, and has a strong impact on control accuracy, and is used for brshless DC motor
The DSP2812's of control is internally integrated ADC, and the receptible analogue signal amplitude scope of its pin is 0~3V.
Analyzed based on more than, for bipolar analog signal, its amplitude carries out positive and negative alternating according to conducting relation and changed, its
Excursion mismatches with the ADC inside DSP2812, therefore, must in order to adapt to the requirement that DSP inputs to analog signal
It must take appropriate measures and it is handled.
Utility model content
In order to solve the above problems, the utility model discloses a kind of brshless DC motor AC signal real-time sampling system
System, bipolar analog signal and the unmatched problem of ADC inside DSP2812 are not only solved, while precision can be obtained
Higher sampled result.
What the purpose of this utility model was realized in：
Brshless DC motor AC signal real-time sampling system, including：Hall current sensing circuit, Signal Pretreatment electricity
Road, calibration reference circuit and DSP2812 control system modules；It is described：
Hall current sensing circuit：Sample brushless DC motor control system in phase current signal, and by voltage with
The voltage of corresponding ratio is exported with device；
Signal pre-processing circuit：The voltage magnitude exported from Hall current sensing circuit is biased, i.e., to electricity
Pressure amplitude value is amplified or reduced, so as to meet that DSP2812 is internally integrated the receptible analog signal width of ADC pin institute
Spend scope；
Calibrate reference circuit：The signal value of multi collect is calibrated for error, calibrated collection signal is through ADC
Collection, after carrying out data convert and error compensation, that is, correct sampled value is obtained, so as to realize different closed-loop controls；
DSP2812 control system modules：It is connected for completing analog-to-digital conversion and error compensation, and with PC；
After bipolar analog signal to be measured is gathered by Hall current sensing circuit, give at signal pre-processing circuit
Reason, the result of processing is sent to DSP2812 ADC progress analog-to-digital conversions, and is calibrated based on calibration reference circuit.
Above-mentioned brshless DC motor AC signal real-time sampling system, described Hall current sensing circuit are as follows：
Hall current sensor HDC020 P1 ports and P2 ports is input port, P1 ports connect phase current UIN,
VIN or WIN, P2 port meet U, V or W of phase current, and V0 is output port, and the input of voltage follower is connect by 5.1K resistance
End, DSPGNDF ends are connect by 5.1K resistance and 10K resistance.
Above-mentioned brshless DC motor AC signal real-time sampling system, the signal pre-processing circuit include three complete phases
Same monophase current signal pre-processing circuit, each monophase current signal pre-processing circuit include three TL082, are specially：
First TL082 in-phase input end is believed by resistance R1 connections U-current, V-current or W-current
Number, inverting input is by resistance R2 connection GND, and by resistance R7 connection output ends, output end passes through resistance R6 connections the 3rd
The circuit that individual TL082 is built；
Second TL082 in-phase input end meets GND by electric capacity C1, passes through resistance by resistance R3 connection+5V voltages
R5 meets GND, and inverting input is directly connected to output end, and output end is directly connected to the circuit that the 3rd TL082 is built；
3rd TL082 in-phase input end builds the output end of circuit by first TL082 of resistance R9 connections, leads to
Cross resistance R9 and electric capacity C2 meets GND, output end is connect by resistance R9 and resistance R10, output end, anti-phase input are connect by electric capacity C3
End second TL082 of connection builds the output end of circuit, and output end is grounded by resistance R11 and electric capacity C4, passes through resistance R11
Meet DSP2812 and be internally integrated ADC pin；
According to input signal U-current, V-current or W-current amplitude size, while consider that signal may
The maximum of appearance, by changing resistance R2 and R7 resistance, input signal amplitude is zoomed in or out, makes input signal
In the amplitude that U-current, V-current or W-current point measure between -1.5V~+1.5V.
Beneficial effect：
Firstth, the utility model devises a kind of brshless DC motor AC signal real-time sampling system, and is designed with double
Polar signal sampling system, to each polar signal implement individually collection, therefore can solve the problem that bipolar analog signal with
The unmatched problem of ADC inside DSP2812, and then realize and bipolar analog signal is directly gathered using DSP2812.
Secondth, due to being designed with Hall current sensing circuit, signal pre-processing circuit, calibration reference circuit, therefore can
Before analog signal is sent into ADC, the processing of outside discharge circuit, including gain, filtering and biasing are just have passed through, and then meet
Requirement of the ADC pins to input analog signal, sampling obtain the higher brshless DC motor phase current of precision, improve detection essence
Degree.
3rd, the utility model brshless DC motor AC signal real-time sampling system autgmentability is strong, moreover it can be used to permanent magnetism
In the phase current collection of synchronous motor, vector controlled is realized.
Brief description of the drawings
Fig. 1 the utility model brshless DC motor AC signal real-time sampling system entire block diagrams.
The circuit diagram of Fig. 2 Hall current sensing circuits.
Fig. 3 U phase current signals pre-process circuit.
Fig. 4 ADC sample flow chart；
Embodiment
The utility model embodiment is described in further detail below in conjunction with the accompanying drawings.
Brshless DC motor AC signal real-time sampling system, entire block diagram is as shown in figure 1, the system includes：Hall electricity
Spread inductive circuit, signal pre-processing circuit, calibration reference circuit and DSP2812 control system modules；It is described：
Hall current sensing circuit：Sample brushless DC motor control system in phase current signal, and by voltage with
The voltage of corresponding ratio is exported with device；
Signal pre-processing circuit：The voltage magnitude exported from Hall current sensing circuit is biased, i.e., to electricity
Pressure amplitude value is amplified or reduced, so as to meet that DSP2812 is internally integrated the receptible analog signal width of ADC pin institute
Spend scope；
Calibrate reference circuit：The signal value of multi collect is calibrated for error, calibrated collection signal is through ADC
Collection, after carrying out data convert and error compensation, that is, correct sampled value is obtained, so as to realize different closed-loop controls；
DSP2812 control system modules：It is connected for completing analog-to-digital conversion and error compensation, and with PC；
After bipolar analog signal to be measured is gathered by Hall current sensing circuit, give at signal pre-processing circuit
Reason, the result of processing is sent to DSP2812 ADC progress analog-to-digital conversions, and is calibrated based on calibration reference circuit.
Specific embodiment two
The brshless DC motor AC signal real-time sampling system of the present embodiment, on the basis of specific embodiment one, enters
It is as follows that one step limits described Hall current sensing circuit：
Hall current sensor HDC020 P1 ports and P2 ports is input port, P1 ports connect phase current UIN,
VIN or WIN, P2 port meet U, V or W of phase current, and V0 is output port, and the input of voltage follower is connect by 5.1K resistance
End, DSPGNDF ends are connect by 5.1K resistance and 10K resistance.
Fig. 2 illustrates the structure and principle of Hall current sensing circuit by taking U items and V items as an example, as follows：
First Hall current sensor HDC020 P1 ports and P2 ports is input port, connects the first phase current respectively
UIN and U, V0 are output port, and LM358 IN1+ ends are connect by 5.1K resistance, are connect by 5.1K resistance and 10K resistance
DSPGNDF ends；
Second Hall current sensor HDC020 P1 ports and P2 ports is input port, connects the second phase current respectively
VIN and V, V0 are output port, and LM358 IN2+ ends are connect by 5.1K resistance, are connect by 5.1K resistance and 10K resistance
DSPGNDF ends；
The IN1- of the LM358 connects with OUT1, as first group of output, is designated as U-current, IN2- and OUT2 company
Connect, as first group of output, be designated as V-current；
The phase current signal of two Hall element HDC020 collection brshless DC motors, changes directly proportional voltage signal
Afterwards, the voltage of sampling is exported by the voltage follower in operational amplifier LM358.
Specific embodiment three
The brshless DC motor AC signal real-time sampling system of the present embodiment, on the basis of specific embodiment one, enters
One step, which limits the signal pre-processing circuit, includes three identical monophase current signal pre-processing circuits, each single-phase electricity
Stream signal pre-processing circuit includes three TL082, is specially：
First TL082 in-phase input end is believed by resistance R1 connections U-current, V-current or W-current
Number, inverting input is by resistance R2 connection GND, and by resistance R7 connection output ends, output end passes through resistance R6 connections the 3rd
The circuit that individual TL082 is built；
Second TL082 in-phase input end meets GND by electric capacity C1, passes through resistance by resistance R3 connection+5V voltages
R5 meets GND, and inverting input is directly connected to output end, and output end is directly connected to the circuit that the 3rd TL082 is built；
3rd TL082 in-phase input end builds the output end of circuit by first TL082 of resistance R9 connections, leads to
Cross resistance R9 and electric capacity C2 meets GND, output end is connect by resistance R9 and resistance R10, output end, anti-phase input are connect by electric capacity C3
End second TL082 of connection builds the output end of circuit, and output end is grounded by resistance R11 and electric capacity C4, passes through resistance R11
Meet DSP2812 and be internally integrated ADC pin；
According to input signal U-current, V-current or W-current amplitude size, while consider that signal may
The maximum of appearance, by changing resistance R2 and R7 resistance, input signal amplitude is zoomed in or out, makes input signal
In the amplitude that U-current, V-current or W-current point measure between -1.5V~+1.5V.
Fig. 3 illustrates the structure and principle of signal pre-processing circuit by taking U items as an example, as follows：
U phase current signals pretreatment circuit includes three TL082, is specially：
First TL082 in-phase input end passes through resistance by resistance R1 connection U-current signals, inverting input
R2 connection GND, by resistance R7 connection output ends, output end connects the circuit that the 3rd TL082 built by resistance R6；
Second TL082 in-phase input end meets GND by electric capacity C1, passes through resistance by resistance R3 connection+5V voltages
R5 meets GND, and inverting input is directly connected to output end, and output end is directly connected to the circuit that the 3rd TL082 is built；
3rd TL082 in-phase input end builds the output end of circuit by first TL082 of resistance R9 connections, leads to
Cross resistance R9 and electric capacity C2 meets GND, output end is connect by resistance R9 and resistance R10, output end, anti-phase input are connect by electric capacity C3
End second TL082 of connection builds the output end of circuit, and output end is grounded by resistance R11 and electric capacity C4, passes through resistance R11
Meet DSP2812 and be internally integrated ADC pin；
According to input signal U-current amplitude size, while consider the maximum that signal is likely to occur, pass through change
Resistance R2 and R7 resistance, are zoomed in or out to input signal amplitude, the width for making input signal be measured in U-current points
Value is between -1.5V~+1.5V.
Specific embodiment four
The brshless DC motor AC signal real-time sampling system of the present embodiment, in specific embodiment one, specific embodiment
Two or specific embodiment three on the basis of, further to ADC sampling flow illustrate.
ADC samples flow as shown in figure 4, in software flow, when in the timer period in DSP2812 time manager
When disconnected event occurs, set triggering ADC to enter Sampling interrupt, into interruption after reset interrupt flag bit first, for entrance next time
Interruption is prepared, after ambipolar electric machine phase current analog signal is handled by the signal pre-processing circuit shown in Fig. 3,
Analog signal after processing is given to DSP2812 ADC pins, from ADC results buffer register take out transformation result, by its with
0x8000 carries out xor operation, the data of Q0 forms can be converted to the data of Q15 forms, while signal is reduced
Processing, arrives this, the full embodiment of as whole brshless DC motor AC signal real-time sampling system, the utility model pin
Collection can in real time, accurately be realized to the collection of brshless DC motor bipolar signal and calculated, and good precision can be reached.
It should be noted that in the embodiment above, as long as reconcilable technical scheme can carry out permutation and combination, this
Art personnel can be possible to according to the mathematical knowledge limit of permutation and combination, and therefore, the utility model is no longer to arrangement
Technical scheme after combination illustrated one by one, but it is understood that being the technical scheme after permutation and combination by the utility model
It is disclosed.
Although describing the utility model according to the embodiment of limited quantity, above description, this technology are benefited from
It is in field it is clear for the skilled person that in the scope of the present invention thus described, it can be envisaged that other embodiments.In addition, should
Pay attention to, the language used in this specification primarily to readable and teaching purpose and select, rather than in order to explain
Or limit theme of the present utility model and select.Therefore, in the feelings without departing from the scope and spirit of the appended claims
Under condition, many modifications and changes will be apparent from for those skilled in the art.For this practicality
New scope, the disclosure done to the utility model are illustrative and not restrictive, and the scope of the utility model is by institute
Attached claims limit.
Claims (1)
1. brshless DC motor AC signal real-time sampling system, it is characterised in that including：Hall current sensing circuit, signal
Pre-process circuit, calibration reference circuit and DSP2812 control system modules；It is described：
Hall current sensing circuit is as follows：
Hall current sensor HDC020 P1 ports and P2 ports is input port, and P1 ports meet UIN, VIN of phase current
Or WIN, P2 port meet U, V or W of phase current, V0 is output port, and the input of voltage follower is connect by 5.1K resistance, is led to
Cross 5.1K resistance and 10K resistance connects DSPGNDF ends；
The phase current signal in brushless DC motor control system is sampled, and the electricity of corresponding ratio is exported by voltage follower
Pressure；
Signal pre-processing circuit includes three identical monophase current signal pre-processing circuits, and each monophase current signal is pre-
Process circuit includes three TL082, is specially：
First TL082 in-phase input end by resistance R1 connection U-current, V-current or W-current signals,
Inverting input is by resistance R2 connection GND, and by resistance R7 connection output ends, output end connects the 3rd by resistance R6
The circuit that TL082 is built；
Second TL082 in-phase input end is met GND by electric capacity C1, connect by resistance R5 by resistance R3 connection+5V voltages
GND, inverting input are directly connected to output end, and output end is directly connected to the circuit that the 3rd TL082 is built；
3rd TL082 in-phase input end builds the output end of circuit by first TL082 of resistance R9 connections, passes through electricity
Resistance R9 and electric capacity C2 meets GND, and output end is connect by resistance R9 and resistance R10, connects output end by electric capacity C3, inverting input connects
The output end that second TL082 builds circuit is connect, output end is grounded by resistance R11 and electric capacity C4, connect by resistance R11
DSP2812 is internally integrated ADC pin；
According to input signal U-current, V-current or W-current amplitude size, while consider that signal is likely to occur
Maximum, by changing resistance R2 and R7 resistance, input signal amplitude is zoomed in or out, makes input signal in U-
The amplitude of current, V-current or W-current point measurement is between -1.5V~+1.5V；
The voltage magnitude exported from Hall current sensing circuit is biased, i.e., voltage magnitude is amplified or contracted
It is small, so as to meet that DSP2812 is internally integrated the receptible analogue signal amplitude scope of ADC pin institute；
Calibrate reference circuit：The signal value of multi collect is calibrated for error, calibrated collection signal is adopted through ADC
Collection, after carrying out data convert and error compensation, that is, correct sampled value is obtained, so as to realize different closed-loop controls；
DSP2812 control system modules：It is connected for completing analog-to-digital conversion and error compensation, and with PC；
After bipolar analog signal to be measured is gathered by Hall current sensing circuit, give signal pre-processing circuit and handled,
The ADC that the result of processing is sent to DSP2812 carries out analog-to-digital conversion, and is calibrated based on calibration reference circuit.
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| CN201720318149.3U CN206671826U (en) | 2017-03-29 | 2017-03-29 | Brshless DC motor AC signal real-time sampling system |
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| CN201720318149.3U CN206671826U (en) | 2017-03-29 | 2017-03-29 | Brshless DC motor AC signal real-time sampling system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109324225A (en) * | 2018-11-15 | 2019-02-12 | 国网山东省电力公司电力科学研究院 | A kind of high-precision current sampling system for CVT on-line monitoring |
| CN110361671A (en) * | 2018-04-08 | 2019-10-22 | 佛山科学技术学院 | A kind of sampling module for UPS |
| CN112486065A (en) * | 2020-11-27 | 2021-03-12 | 上海商米科技集团股份有限公司 | Alternating current signal sampling method and device and handheld code scanning printer |
| CN113848499A (en) * | 2021-09-28 | 2021-12-28 | 珠海格力电器股份有限公司 | Parameter monitoring method and device of driving power supply and driving power supply system |
-
2017
- 2017-03-29 CN CN201720318149.3U patent/CN206671826U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361671A (en) * | 2018-04-08 | 2019-10-22 | 佛山科学技术学院 | A kind of sampling module for UPS |
| CN109324225A (en) * | 2018-11-15 | 2019-02-12 | 国网山东省电力公司电力科学研究院 | A kind of high-precision current sampling system for CVT on-line monitoring |
| CN109324225B (en) * | 2018-11-15 | 2021-05-28 | 国网山东省电力公司电力科学研究院 | High-precision current sampling system for CVT (constant-voltage transformer) online monitoring |
| CN112486065A (en) * | 2020-11-27 | 2021-03-12 | 上海商米科技集团股份有限公司 | Alternating current signal sampling method and device and handheld code scanning printer |
| CN113848499A (en) * | 2021-09-28 | 2021-12-28 | 珠海格力电器股份有限公司 | Parameter monitoring method and device of driving power supply and driving power supply system |
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