CN206020508U - A kind of SPWM alternating voltage sampling circuits and sampling system - Google Patents
A kind of SPWM alternating voltage sampling circuits and sampling system Download PDFInfo
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- CN206020508U CN206020508U CN201620957128.1U CN201620957128U CN206020508U CN 206020508 U CN206020508 U CN 206020508U CN 201620957128 U CN201620957128 U CN 201620957128U CN 206020508 U CN206020508 U CN 206020508U
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Abstract
The utility model is related to a kind of SPWM alternating voltage sampling circuits and sampling system, and this SPWM alternating voltage sampling circuits include：Isolate partial pressure unit for connecting the high resistant of any two-phase in SPWM three-phase alternating currents, isolate the one-level RC filter unit that partial pressure unit is connected with the high resistant；Two inputs of one alternating voltage amplifier processing unit are connected with the output end of one-level RC filter unit, reference voltage unit respectively；And the output end of the alternating voltage amplifier processing unit passes sequentially through two grades of RC filter units, sampled signal processing unit output AC voltage sampled signal；The utility model is sampled to the alternating voltage containing SPWM higher hamonic waves, output is a kind of to include the whole shape informations of input voltage, alternating voltage sampled signal comprising positive negative peak, frequency, phase place, waveform etc., is transferred in dsp controller and whole control system is controlled.
Description
Technical field
The utility model is related to a kind of SPWM alternating voltage sampling circuits and sampling system.
Background technology
Output voltage is one vital parameter of power supply class system, in the power-supply device of output three-phase alternating voltage
In, three-phase alternating voltage can be detected, the control accuracy of power control system and the operation of power-supply device are weighed to pass with protecting
Will.
At present, mainly alternating voltage is detected by alternating voltage sampling circuit, is predominantly detected in power source products
Through the filtered output AC voltage of LC filter circuits, and cannot detect containing higher hamonic wave SPWM alternating voltage.Main friendship
Stream sample circuit has three kinds：(1) based on voltage transformer or the alternating voltage sampling circuit of transformer, by former secondary no-load voltage ratio come
Determine the ac voltage of input, program high cost, take that PCB surface product is big, linearity uniformity is bad, sampling precision low and
Dangerous；(2) alternating voltage circuit, the voltage meeting when program has the disadvantage heavier loads, after rectification are detected using bridge rectifier
Decline, affect the sampling to voltage, detection voltage error is big, and reliability is poor；(3) the voltage sample electricity of differential amplification pattern
Road, by carrying out partial pressure in ac voltage input series resistance, after processing through amplifier amplifier, exports ac sampling signal,
Patent such as application number CN201520534951.7, CN201220155201.5 is carried out to mains input voltage by this kind of method
Voltage sample, applies in household electrical appliances electric-control system.
The alternating voltage sampling circuit for generally using at present, the such as alternating voltage based on voltage transformer or transformer are sampled
Circuit, using bridge rectifier detection alternating voltage circuit etc., the voltage sampling signal only peak comprising input ac voltage of output
Value or virtual value, it is impossible to the whole shape informations comprising input voltage.And Application No. CN201520534951.7,
The patent of CN201220155201.5, discloses the voltage sampling circuit of mains input voltage, and it is right that this kind of circuit not can achieve
The sampling of SPWM alternating voltages, and reference voltage obtained through electric resistance partial pressure by general supply voltage, sampled signal precision is relatively low.
Utility model content
The purpose of this utility model is to provide a kind of SPWM alternating voltage sampling circuits and sampling system, and which can effective detection
SPWM alternating voltages are simultaneously sampled, output AC voltage sampled signal, and are easy to pass to dsp controller and carry out system control
System.
In order to solve above-mentioned technical problem, the utility model provides a kind of SPWM alternating voltage sampling circuits, including：With
In connection SPWM three-phase alternating currents, the high resistant of arbitrarily two-phase isolates partial pressure unit, isolates the one-level that partial pressure unit is connected with the high resistant
RC filter units；Two inputs of one alternating voltage amplifier processing unit respectively with one-level RC filter unit, reference voltage unit
Output end be connected；And the output end of the alternating voltage amplifier processing unit passes sequentially through two grades of RC filter units, samplings
Signal processing unit output AC voltage sampled signal.
Further, the high resistant isolation partial pressure unit includes：Resistance R2, resistance R3, resistance R5 and resistance R6；Wherein SPWM
In three-phase alternating current, any two-phase is accessed by resistance R3 and resistance R6 respectively, and resistance R3, resistance R6 pass through resistance R5, electricity respectively
Resistance R2 is connected with the end of oppisite phase of operational amplifier U1, in-phase end in alternating voltage amplifier processing unit；And the resistance R3, electricity
Resistance R6 adopts M Ω level resistance.
Further, the one-level RC filter unit includes：Electric capacity C1 and electric capacity C2；Wherein one end concatenation operation of electric capacity C1
The end of oppisite phase of amplifier U1, the tie point of its other end connection resistance R2 and resistance R3；And one end concatenation operation of electric capacity C2
The in-phase end of amplifier U1, the tie point of its other end connection resistance R5 and resistance R6.
Further, the reference voltage unit includes：The series circuit being made up of resistance R1 and resistance R7, and power supply VCC
Terminate into the in-phase end of resistance R1 end concatenation operation amplifier U1 from resistance R7；And between the resistance R1 and resistance R7
Tie point connects voltage reference chip U2, and the two ends shunt capacitance C3 of voltage reference chip U2 over the ground.
Further, the alternating voltage amplifier processing unit includes：Resistance R4, resistance R4 is used as operational amplifier U1's
Feedback resistance, the end of oppisite phase of its two ends difference concatenation operation amplifier U1 and output end.
Further, the two-way clamp diode of low drain is also associated between the in-phase end and end of oppisite phase of the operational amplifier U1
D1.
Further, two grades of RC filter units include：Resistance R8, electric capacity C4, the wherein first end of resistance R8 and computing
The output end of amplifier U1 is connected, and the second end is grounded by electric capacity C4.
Further, the sampled signal processing unit includes：Resistance R9, one end of resistance R9 and second end of resistance R8
It is connected, the other end of resistance R9 is connected to the ground, and using second end of the resistance R8 as SPWM alternating voltage sampling circuits
Output end.
Another aspect, the utility model additionally provide a kind of sampling system.
The sampling system includes described SPWM alternating voltage sampling circuits, and the alternating voltage sampling circuit is by alternating current
During pressure sampled signal is input into dsp controller.
The beneficial effects of the utility model are that the utility model is adopted to the alternating voltage containing SPWM higher hamonic waves
Sample, output is a kind of to include the whole shape informations of input voltage, and the alternating voltage comprising positive negative peak, frequency, phase place, waveform etc. is adopted
Sample signal, is transferred in dsp controller and whole control system is controlled.The circuit adopts single supply op, and circuit is simple,
Output sampled signal high precision, interference are little, and include input voltage all-wave information.
Description of the drawings
With reference to the accompanying drawings and examples the utility model is further illustrated.
Fig. 1 is the theory diagram of this SPWM alternating voltage sampling circuits；
Fig. 2 is the circuit theory diagrams of this SPWM alternating voltage sampling circuits；
Fig. 3 is the input of this SPWM alternating voltage sampling circuits, output voltage waveforms comparison schematic diagram.
Specific embodiment
The utility model is described in further detail presently in connection with accompanying drawing.These accompanying drawings are simplified schematic diagram,
Basic structure of the present utility model is only described in a schematic way, therefore which only shows the composition relevant with the utility model.
Embodiment 1
As shown in Figure 1 to Figure 3, the utility model provides a kind of SPWM alternating voltage sampling circuits, including：For connecting
In SPWM three-phase alternating currents, the high resistant isolation partial pressure unit of any two-phase, isolates the one-level RC filtering that partial pressure unit is connected with the high resistant
Unit；Two inputs of one alternating voltage amplifier processing unit respectively with one-level RC filter unit, the output of reference voltage unit
End is connected；And the output end of the alternating voltage amplifier processing unit is passed sequentially through at two grades of RC filter units, sampled signal
Reason unit output AC voltage sampled signal.
Used as a kind of optional embodiment that high resistant isolates partial pressure unit, the high resistant isolation partial pressure unit includes：Electricity
Resistance R2, resistance R3, resistance R5 and resistance R6；Wherein in SPWM three-phase alternating currents, any two-phase is connect by resistance R3 and resistance R6 respectively
Enter, and resistance R3, resistance R6 are respectively by operational amplifier U1 in resistance R5, resistance R2 and alternating voltage amplifier processing unit
End of oppisite phase, in-phase end are connected；And the resistance R3 resistance R6 adopts M Ω level resistance, to realize the defeated of SPWM alternating voltages
Enter end and isolate the high resistant buffer action of partial pressure unit with this high resistant, and through electric resistance partial pressure, by partial pressure after control source to one
Process is filtered in level RC filter units.
Used as a kind of optional embodiment of one-level RC filter unit, the one-level RC filter unit includes：Electric capacity C1
With electric capacity C2；The end of oppisite phase of one end concatenation operation amplifier U1 of wherein electric capacity C1, its other end connection resistance R2 and resistance R3
Tie point；And the in-phase end of one end concatenation operation amplifier U1 of electric capacity C2, its other end connection resistance R5 and resistance R6
Tie point.This one-level RC filter units can achieve the filtering of input ac voltage, filter in most of input ac voltage
SPWM higher hamonic waves, filtered after alternating voltage enter alternating voltage amplifier processing unit carry out voltage conversion.
Used as a kind of optional embodiment of reference voltage unit, the reference voltage unit includes：By resistance R1 and
The series circuit that resistance R7 is constituted, and power supply VCC terminated into the homophase of resistance R1 end concatenation operation amplifier U1 from resistance R7
End；And the tie point between the resistance R1 and resistance R7 connects voltage reference chip U2, and the voltage reference core over the ground
The two ends shunt capacitance C3 of piece U2.The reference voltage unit provides reference voltage V ref of alternating voltage sampling circuit, the benchmark
Voltage Vref precision is determined by voltage reference chip U2 precision, it is desirable to its high precision, and reference voltage V ref determines output electricity
The precision of pressure sampled signal.
As a kind of optional embodiment of alternating voltage amplifier processing unit, the alternating voltage amplifier processing unit
Including：The feedback resistance of resistance R4, resistance R4 as operational amplifier U1, its two ends difference concatenation operation amplifier U1's are anti-
Mutually hold and output end.Alternating voltage and reference voltage that one-level RC filter circuit can be exported by the alternating voltage amplifier processing unit
Amplifier process is carried out, and output AC voltage sampled signal carries out secondary filtering process to two grades of RC filter units.
Further, the two-way clamp diode of low drain is also associated between the in-phase end and end of oppisite phase of the operational amplifier U1
D1, to play the effect of two inputs of protection operational amplifier U1.
Used as a kind of optional embodiment of two grades of RC filter units, two grades of RC filter units include：Resistance R8,
Electric capacity C4, the wherein first end of resistance R8 are connected with the output end of operational amplifier U1, and the second end is grounded by electric capacity C4.This
Two grades of RC filter units realize the filter action of the ac sampling signal of alternating voltage amplifier processing unit output, further filter out
SPWM higher hamonic waves in signal and signal interference.
Used as a kind of optional embodiment of sampled signal processing unit, the sampled signal processing unit includes：Electricity
Resistance R9, one end of resistance R9 is connected with second end of resistance R8, and the other end of resistance R9 is connected to the ground, and by the resistance
Output end of second end of R8 as SPWM alternating voltage sampling circuits.This sampled signal processing unit is two grades of RC filter circuits
The ac sampling signal of output is further processed as the ac sampling signal mV of system needs, and outputs this signal to DSP controls
Device ADC interface processed, this sampled signal processing unit can achieve the final conversion of sampled signal, and prime signal can retain stronger letter
Number, it is processed as, it is ensured that decay in signals transmission little, error is little.
In specific works, SPWM alternating voltages two input SPWM_U, SPWM_V are through high resistant isolation partial pressure unit input electricity
Pressure, the voltage are filtered after most of SPWM higher hamonic waves through one-level RC filter unit, are entered and exchange together with reference voltage V ref
Voltage amplifier processing unit carries out scale operation and process, and AC sampling voltage of the output with reference voltage DC component should
Voltage enters further filtering process in two grades of RC filter units, filters remaining SPWM higher hamonic waves in sampled voltage and signal
Interference, through the voltage sampling signal of filtering process again, enters sampled signal process circuit, is processed as system control chip (DSP
Controller) need alternating voltage sampled signal mV output.
By specific embodiment, the SPWM alternating voltage sampling circuit output voltage sampled signals are more intuitively recognized
Accuracy and the all-wave information for containing, now provide simplified application examples.
Assume that SPWM alternating voltages are the sine voltage containing SPWM higher hamonic waves, the sine voltage peak value is Um,
For simplifying calculating, it is handled as follows：
Work as R1=R4, R2=R5, R3=R6, during R8=R9,
As (R2+R3)/R1=Um/2,
All-view signal of alternating voltage sampled signal mV for SPWM alternating voltages, wherein available parameter include：Voltage
Positive negative peak, average, virtual value, frequency, phase place etc., be easy to variation application in follow-up system.
The benchmark of output AC voltage sampled signal is 1/2Vref, as Vref ＞ 2, mV ＞ 0, and output AC voltage is adopted
Sample signal only has positive voltage value, and therefore, the input of operational amplifier U1 does not contain negative voltage, and operational amplifier U1 can adopt single
Power supply is powered, and the circuit can achieve the simplification of power supply power supply plan；The precision of wherein reference voltage V ref has influence on sampled signal
The precision of mV, therefore reference voltage required precision is high, can be realized by voltage reference chip.
The front and back stages RC filtering adopted in this circuit, the filtering that can achieve the alternating voltage with SPWM higher hamonic waves are adopted
Sample, under the filters solutions, voltage sampling signal phase offset is little, and harmonic wave interference is little, and preferable alternating voltage sampling letter is obtained
Number；
In the program, the prime of SPWM alternating voltage sampling circuits is stronger signal, after sampled signal processing unit output
Sampling system needs alternating voltage sampled signal, and can make alternating voltage sampled signal precision by the coupling of resistance value in circuit
Height, amplitude attenuation are little.
Embodiment 2
On the basis of embodiment 1, the utility model also provided a kind of sampling system.
The sampling system includes SPWM alternating voltage sampling circuits as described in Example 1, the alternating voltage sampling electricity
During road is input into alternating voltage sampled signal to dsp controller.
With above-mentioned according to desirable embodiment of the present utility model as enlightenment, by above-mentioned description, related work people
Member can carry out various change and modification completely in the range of without departing from this utility model technological thought.This reality
The content being not limited to new technical scope on specification, it is necessary to determine its technology according to right
Property scope.
Claims (9)
1. a kind of SPWM alternating voltage sampling circuits, it is characterised in that include：
Isolate partial pressure unit for connecting the high resistant of any two-phase in SPWM three-phase alternating currents, isolate partial pressure unit with the high resistant and be connected
One-level RC filter unit；
Two inputs of one alternating voltage amplifier processing unit respectively with one-level RC filter unit, the output end of reference voltage unit
It is connected；And
It is defeated that the output end of the alternating voltage amplifier processing unit passes sequentially through two grades of RC filter units, sampled signal processing unit
Go out alternating voltage sampled signal.
2. SPWM alternating voltage sampling circuits according to claim 1, it is characterised in that
The high resistant isolation partial pressure unit includes：Resistance R2, resistance R3, resistance R5 and resistance R6；Wherein
In SPWM three-phase alternating currents, any two-phase is accessed by resistance R3 and resistance R6 respectively, and resistance R3, resistance R6 pass through respectively
Resistance R5, resistance R2 are connected with the end of oppisite phase of operational amplifier U1, in-phase end in alternating voltage amplifier processing unit；And
The resistance R3, resistance R6 adopt M Ω level resistance.
3. SPWM alternating voltage sampling circuits according to claim 2, it is characterised in that the one-level RC filter unit bag
Include：Electric capacity C1 and electric capacity C2；Wherein
The end of oppisite phase of one end concatenation operation amplifier U1 of electric capacity C1, the tie point of its other end connection resistance R2 and resistance R3；
And
The in-phase end of one end concatenation operation amplifier U1 of electric capacity C2, the tie point of its other end connection resistance R5 and resistance R6.
4. SPWM alternating voltage sampling circuits according to claim 3, it is characterised in that the reference voltage unit bag
Include：
The series circuit being made up of resistance R1 and resistance R7, and power supply VCC terminated into resistance R1 end concatenation operations are put from resistance R7
The in-phase end of big device U1；And
Tie point between the resistance R1 and resistance R7 connects voltage reference chip U2, and voltage reference chip U2 over the ground
Two ends shunt capacitance C3.
5. SPWM alternating voltage sampling circuits according to claim 4, it is characterised in that the alternating voltage amplifier is processed
Unit includes：The feedback resistance of resistance R4, resistance R4 as operational amplifier U1, its two ends difference concatenation operation amplifier U1
End of oppisite phase and output end.
6. SPWM alternating voltage sampling circuits according to claim 5, it is characterised in that the operational amplifier U1's is same
Mutually the two-way clamp diode D1 of low drain is also associated between end and end of oppisite phase.
7. SPWM alternating voltage sampling circuits according to claim 6, it is characterised in that two grades of RC filter unit bags
Include：Resistance R8, electric capacity C4, wherein
The first end of resistance R8 is connected with the output end of operational amplifier U1, and the second end is grounded by electric capacity C4.
8. SPWM alternating voltage sampling circuits according to claim 7, it is characterised in that the sampled signal processing unit
Including：Resistance R9, one end of resistance R9 are connected with second end of resistance R8, and the other end of resistance R9 is connected to the ground, and
Using second end of the resistance R8 as SPWM alternating voltage sampling circuits output end.
9. a kind of sampling system, it is characterised in that include the SPWM alternating voltages sampling electricity as described in any one of claim 1-8
Road, during the alternating voltage sampling circuit is input into alternating voltage sampled signal to dsp controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620957128.1U CN206020508U (en) | 2016-08-26 | 2016-08-26 | A kind of SPWM alternating voltage sampling circuits and sampling system |
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| CN201620957128.1U CN206020508U (en) | 2016-08-26 | 2016-08-26 | A kind of SPWM alternating voltage sampling circuits and sampling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828307A (en) * | 2018-09-12 | 2018-11-16 | 深圳市泰昂能源科技股份有限公司 | A kind of alternating voltage sampling circuit and detection device |
| CN113740087A (en) * | 2021-07-23 | 2021-12-03 | 西尼机电（杭州）有限公司 | Elevator balance coefficient detection equipment |
-
2016
- 2016-08-26 CN CN201620957128.1U patent/CN206020508U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828307A (en) * | 2018-09-12 | 2018-11-16 | 深圳市泰昂能源科技股份有限公司 | A kind of alternating voltage sampling circuit and detection device |
| CN113740087A (en) * | 2021-07-23 | 2021-12-03 | 西尼机电（杭州）有限公司 | Elevator balance coefficient detection equipment |
| CN113740087B (en) * | 2021-07-23 | 2024-03-19 | 西尼机电（杭州）有限公司 | Elevator balance coefficient detection equipment |
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