CN105740205B - A kind of switching power converters parameter recorder filtering method and its device - Google Patents
A kind of switching power converters parameter recorder filtering method and its device Download PDFInfo
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- CN105740205B CN105740205B CN201610201169.2A CN201610201169A CN105740205B CN 105740205 B CN105740205 B CN 105740205B CN 201610201169 A CN201610201169 A CN 201610201169A CN 105740205 B CN105740205 B CN 105740205B
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Abstract
A kind of switching power converters parameter recorder filtering method of present invention offer and its device, belong to field of switch power, including input terminal sampling module, switching power converters, temperature sensor module, output end sampling module, processor module, non-volatile memory module, independent current source module and usb interface module；The output end of input terminal sampling module and output end sampling module is connect with processor module；Switching power converters are connect through temperature sensor module with processor module；The output end of processor module is connect with non-volatile memory module；Independent current source module output end connect power supply with non-volatile memory module；Non-volatile memory module output end is connect with usb interface module；By by switching power converters during the work time main components parameters acquisition be stored in nonvolatile storage, realize switching power converters break down after data analysis, convenient for finding failure cause.
Description
Technical field
The present invention relates to field of switch power, are specifically to be related to a kind of switching power converters parameter recorder filter
Wave method and its device.
Background technology
With the development of modern power electronics technology, switch power technology also improves constantly.Currently, Switching Power Supply with
Small-sized, light weight and efficient feature are widely used in each class of electronic devices, are that current electronics and information industry develops rapidly not
A kind of supply unit that can lack.But when switching tube is operated on off state in Switching Power Supply, it is harmonious to will produce spike interference
Wave signal, although by rectifying and wave-filtering, the ripple and noise in output voltage and output current are still larger.These noises can be right
Later data processing causes prodigious influence, to influence the performance of switching power control system, leads to the electric energy of supply unit
Degradation.These noises how are filtered out while can ensure data accuracy seems particularly significant.
Switching power converters parameter recorder is mainly used for the real-time monitoring to each parameter of switching power converters, number
According to accuracy for it, just seem more important.With traditional filtering algorithm mathematical model complexity, CPU operands are big,
It is unfavorable to quick sampling, and historical data can not be modified, to influence entire switching power converters reference record
The recorded accuracy of instrument.In conclusion in order to make switching power converters parameter recorder recorded data have more
There is researching value, there is an urgent need to a kind of accurate, quick, efficient and with strong points filtering algorithms.
Invention content
What the present invention needed to solve is the problem of existing filtering algorithm can not be modified historical data, provides one kind and opens
Powered-down source converter parameter recorder filtering method and its device.
The present invention solves the above problems by the following technical programs：
A kind of switching power converters parameter recorder filtering method, includes the following steps：
Step 1, A/D samplings are carried out with noise signal with cycle T to measured signal；
Step 2, sampled data is passed through adaptive cancellation formula output signal e1、e2……en；
Step 3, output signal Fast Fourier Transform (FFT) (FFT) is carried out every time T ' to determine in adaptive cancellation formula
The value of adaptation coefficient K；
Step 4, the signal e exported by step 2n-1And enThe letter of subsequent point is predicted according to the value of the K determined in step 3
Number e'n+1；
Step 5, the e of operation output will be acquiredn+1With prediction e'n+1Carry out difference operation；
Step 6, when the absolute difference of step 5 is less than or equal to preset limits of error value Δ emaxWhen, take en+1
As the virtual value of signal, return to step 2；
Step 7, when the absolute difference of step 5 is more than preset limits of error value Δ emaxWhen, Schilling en+1=
e'n+1；
Step 8, the signal e exported by step 2nAnd en+2Predict the centre signal e " of a bitn+1；
Step 9, by the e in step 7n+1With prediction e "n+1Carry out difference operation；
Step 10, when the absolute difference of step 9 is less than or equal to preset limits of error value Δ emaxWhen, take en+1
=e'n+1As the virtual value of signal, return to step 2；
Step 11, when the absolute difference of step 9 is more than preset limits of error value Δ emaxWhen, Schilling en+1=
(e'n+1+e”n+1)/2, return to step 2.
Adaptive cancellation formula in step 2 is
E (n)=d (n)-k*N1(n)
In formula, d (n) indicates the sampled value of measured signal, N1(n) indicate that the sampled value of noise signal, k are adaptive system
Number, it is operation output signal that initial value, which is set as 1, e (n),.
Determine that the process of the value of adaptation coefficient K in adaptive cancellation formula is in step 3：
Step 3.1, with cycle T ' output signal carry out Fast Fourier Transform (FFT) (FFT), by original time-domain signal turn
It changes into as frequency-region signal；
Step 3.2, the ratio for calculating signal and resultant signal of the frequency more than 20HZ in frequency-region signal, when first time ratio is big
When 1/20, adaptation coefficient K increases by 0.1, conversely, the value of adaptation coefficient K is constant；
Step 3.3, when the odds ratio last time of signal of the frequency more than 20HZ and resultant signal in frequency-region signal next time
It is small, continue the value for increasing adaptation coefficient K, until the ratio of signal of the frequency more than 20HZ and resultant signal occurs in frequency-region signal
Minimum value；Conversely, reducing the value of adaptation coefficient K, until frequency is more than the ratio of the signal and resultant signal of 20HZ in frequency-region signal
There is minimum value in value.
Difference operation formula in step 5 is
Δ e=| e 'n+1-en+1|
Δ e ＜=Δ emax
In formula, Δ e indicates acquisition operation output signal en+1With prediction output signal e 'n+1The size of the absolute value of difference,
ΔemaxFor limits of error value, value range is 0.01≤Δ emax≤1。
A kind of switching power converters parameter recorder device, including input terminal sampling module, switching power converters, temperature
Spend sensor assembly, output end sampling module, processor module, non-volatile memory module, independent current source module and USB interface
Module；The output end of input terminal sampling module and output end sampling module is connect with processor module；Switching power converters
It is connect with processor module through temperature sensor module；The output end of processor module is connect with non-volatile memory module；Solely
Vertical power module outlet connect power supply with non-volatile memory module；Non-volatile memory module output end and USB interface mould
Block connects.
In said program, preferably input terminal sampling module includes 1A/D converters, the 1st differential amplifier circuit, the 1st
One end of noise samples circuit, the 1st voltage sensor, capacitance C1 and resistance R1, the capacitance C1 connect voltage input end, the end
One end of resistance R1, the 1st noise samples circuit and the 1st voltage sensor, the other end connection the 1st of the capacitance C1 are connected simultaneously
Noise samples circuit, the 1st voltage sensor, the other end of voltage input end and ground connection；The other end connecting valve electricity of resistance R1
The input terminal of source converter, the end connect the other end of the 1st differential amplifier circuit simultaneously；1st differential amplifier circuit, the 1st
The output end of noise samples circuit and the 1st voltage sensor is connect with the input terminal of 1A/D converters simultaneously；1A/D is converted
The output end of device and the input terminal of processor module connect.
In said program, the preferably described output end sampling module includes 2A/D converters, the 2nd differential amplification electricity
One end of road, the 2nd noise samples circuit, the 2nd voltage sensor, capacitance C2 and resistance R2, the capacitance C2 connect voltage output
End, the end connect one end of resistance R2, the 2nd voltage sensor of the 2nd noise samples circuit simultaneously,；The other end of the capacitance C2
Connect the 2nd noise samples circuit and the 2nd voltage sensor, the other end of voltage output end and ground connection；The other end of resistance R2 connects
The input terminal of switching power converters is connect, which connects the 2nd another input terminal of differential amplifier circuit simultaneously；2nd difference is put
The output end of big circuit, the 2nd noise samples circuit and the 2nd voltage sensor is connect with the input terminal of 2A/D converters simultaneously；
The output end of 2A/D converters is connect with processor module.
Influence of the high voltage to non-volatile memory module in order to prevent, in said program, preferably processor module
With the mode that non-volatile memory module is light-coupled isolation communication connection.
In order to more preferably acquire the temperature of each device in switching power converters, in said program, preferably temperature passes
Sensor module includes at least 2 temperature sensors, and temperature sensor is mounted on the inductance, metal-oxide-semiconductor, transformation of switching power converters
Near device and rectifier diode.
Advantages of the present invention is with effect：
1, the present invention uses bidirectional linear prediction technique, can effectively filter out the influence that switching noise is brought, and obtains more accurate
Sampled data；
2, using linear forward and backward prediction technique, mathematical model is succinct, can reduce the operand of CPU, more favorably
In quick sampling and more compatible with microprocessor.
3, since using predicting means backward, historical data being modified so that the data precision after sampling obtain into
One step improves, and the present invention is made to be used in Switching Power Supply parameter recorder more advantage.
Description of the drawings
Fig. 1 is the filtering flow chart of the present invention.
Fig. 2 is the general arrangement structure chart of the present invention.
Specific implementation mode
The invention will be further described with reference to embodiments.
A kind of switching power converters parameter recorder filtering method, as shown in Figure 1, including the following steps：
Step 1, processor module carries out A/D samplings with noise signal to measured signal with cycle T, obtains n letters to be measured
Number sampled value and n noise signal sample values, are set to d1,d2,d3,…,dnAnd N1,N2,N3,…,Nn；
Step 2, it is analyzed according to existing adaptive cancellation system, measured signal：
D (t)=s (t)+N0(t)
Wherein, s (t) is useful signal, N0(t) it is noise signal, is the noise to be offset, s (t) and N0(t) uncorrelated.
The noise signal N in measured signal can be acquired from the noise samples circuit of switching power converters parameter recorder1
(t).Since noise signal is mainly decayed during acquisition, other parameters are held essentially constant, so practical
Upper institute's acquisition noise signal N1(t) with former noise signal N0(t) substantially linear.
I.e.
Y (t)=k*N1(t)
Wherein, k is adaptation coefficient, and it is 1≤k≤100, the size of value that initial value, which enables k=1, general value range,
By the effect that offsets for the system that directly affects, value is too small, offsets effect unobvious, and value is excessive, can introduce more noises instead.
Y (t) is by N1(t) through real response determined by adaptation coefficient k.
System output signal：
E (t)=d (t)-y (t)=s (t)+N0(t)-y(t)
To improve noise cancellation effect, y (t) should be to N in d (t)0(t) best estimate：
Therefore, the output signal of adaptive cancellation system：
That is, working as N1(t) and N0(t) when linearly related and k takes certain value,
E (t)=s (t)
At this point, system output signal is preferably to offset situation.
K=1 is enabled according to initial value, it can be with the interior output useful signal e of time T '1、e2……en, T ' acquires according to oneself
Frequency is set, and the present invention sets T ' and is equal to the time that AD samples 1024 points.
Step 3, useful signal e is exported in step 21、e2……enAfterwards, processor module is defeated to adaptive cancellation system
Go out signal and carry out Fast Fourier Transform (FFT) (FFT), by useful signal e1、e2……enTime-domain signal be converted into and be easy to analyze
Frequency-region signal (frequency spectrum of signal), to judge the signal of frequency in adaptive cancellation system output signal more than 20HZ
Content, i.e., the interference signals such as thermal noise that industrial frequency harmonic, Switching Power Supply pulsewidth modulation ripple, amplifying device generate in measured signal
Content, handle switching power converters parameter recorder related data when, the signal no more than 20HZ has been regarded as
Use signal.When increasing the value of adaptation coefficient k, the signal content more than 20HZ reduces, then continues to increase adaptation coefficient k's
Value, until minimum value occurs in the ratio of signal of the frequency more than 20HZ and resultant signal in frequency-region signal；Conversely, reducing adaptive system
The value of number k finally determines adaptive until minimum value occurs in the ratio of signal of the frequency more than 20HZ and resultant signal in frequency-region signal
The value for answering coefficient k, return to step 2 exports e after k changes for the first time2, into next step.The value range of adaptation coefficient k is
1≤k≤100, it is 1 that initialization, which enables its value, that is, gives tacit consent to institute acquisition noise signal N1(t) with former noise signal N0(t) equal.
Step 4, the signal e exported by step 2n-1And enPredict the signal e' of subsequent pointn+1；Due to sampling time pole
End, can regard linear change as
Can forward prediction go out en-1Next gathered data be
e'n+1=2en-en-1
Step 5, when collecting enNext data en+1When, prediction error value Δ e is calculated, i.e.,
Δ e=| e 'n+1-en+1|
If Δ emaxFor limits of error value, this value size can be decided according to the actual requirements, and value range is 0.01≤Δ
emax≤ 1, when handling the related data of switching power converters parameter recorder, it can usually enable Δ emax=0.1, you can full
The requirement of sufficient data accuracy.
Step 6, when in step 5
Δ e ＜=Δ emax
Then en+1Without change, en+1It is former collection value as effective output valve.
Step 7, when in step 5
Δ e ＞ Δs emax
Schilling en+1=e'n+1。
Step 8, the signal e exported by step 2nAnd en+2Predict the centre signal e " of a bitn+1；
E can be predicted backwardn+2Previous gathered data be
e”n+1=(en+2+en)/2
Step 9, by the e in step 7n+1With prediction e "n+1Carry out difference operation；
Step 10, when the absolute difference of step 9 is less than or equal to preset limits of error value Δ emaxWhen, take en+1
=e'n+1As the virtual value of signal, return to step 2；
Step 11, when the absolute difference of step 9 is more than preset limits of error value Δ emaxWhen, Schilling en+1=
(e'n+1+e”n+1)/2, return to step 2.
A kind of switching power converters parameter recorder device for realizing the above method, as shown in Fig. 2, being adopted including input terminal
Egf block, switching power converters, temperature sensor module, output end sampling module, processor module, nonvolatile storage mould
Block, independent current source module and usb interface module；The output end of input terminal sampling module and output end sampling module is and processor
Module connects；Switching power converters are connect through temperature sensor module with processor module；The output end of processor module with
Non-volatile memory module connects；Independent current source module output end connect power supply with non-volatile memory module；Non-volatile memory
Device module output end is connect with usb interface module.
Input terminal sampling module includes 1A/D converters, the 1st differential amplifier circuit, the 1st noise samples circuit, the 1st electricity
One end of pressure sensor, capacitance C1 and resistance R1, the capacitance C1 connects voltage input end, which connects resistance R1, the 1st simultaneously
The other end of one end of noise samples circuit and the 1st voltage sensor, the capacitance C1 connects the 1st noise samples circuit, the 1st electricity
Pressure sensor, the other end of voltage input end and ground connection；The input terminal of the other end connecting valve supply convertor of resistance R1, should
End while the other end for connecting the 1st differential amplifier circuit；1st differential amplifier circuit, the 1st noise samples circuit and the 1st electricity
The output end of pressure sensor is connect with the input terminal of 1A/D converters simultaneously；The output end and processor die of 1A/D converters
The input terminal of block connects, as shown in Figure 2.
Output end sampling module includes 2A/D converters, the 2nd differential amplifier circuit, the 2nd noise samples circuit, the 2nd electricity
One end of pressure sensor, capacitance C2 and resistance R2, the capacitance C2 connects voltage output end, which connects resistance R2, the 2nd simultaneously
One end of noise samples circuit and the 2nd voltage sensor,；The other end of the capacitance C2 connects the 2nd noise samples circuit and the 2nd
Voltage sensor, the other end of voltage output end and ground connection；The input terminal of the other end connecting valve supply convertor of resistance R2,
The end connects the 2nd another input terminal of differential amplifier circuit simultaneously；2nd differential amplifier circuit, the 2nd noise samples circuit and
The output end of 2 voltage sensors is connect with the input terminal of 2A/D converters simultaneously；The output end of 2A/D converters and processing
Device module connects, as shown in Figure 2.
Processor module and the mode that non-volatile memory module is light-coupled isolation communication connection, light-coupled isolation is exactly to use
Photo-coupler is isolated.The structure of photo-coupler is equivalent to a light emitting diode and phototriode is packaged together.Optocoupler
Isolation circuit makes do not have being directly connected to for electricity between segregate two parts circuit, mainly prevents from causing because there is the connection of electricity
Interference.
Temperature sensor module includes at least 2 temperature sensors, and temperature sensor is mounted on switching power converters
Near inductance, metal-oxide-semiconductor, transformer and rectifier diode, the temperature of each device can be more preferably acquired.
The preferred embodiment of the invention is illustrated above, but the present invention is not limited to embodiment,
Those skilled in the art can also make various equivalent modifications under the premise of without prejudice to the invention spirit
Or replace, these equivalent modifications or replacement are all contained in scope of the present application.
Claims (9)
1. a kind of switching power converters parameter recorder filtering method, characterized in that include the following steps：
Step 1, A/D samplings are carried out with noise signal with cycle T to measured signal；
Step 2, sampled data is passed through adaptive cancellation formula output signal e1、e2……en；
Step 3, output signal progress Fast Fourier Transform (FFT) (FFT) is determined every time T ' adaptive in adaptive cancellation formula
Answer the value of COEFFICIENT K；
Step 4, the signal e exported by step 2n-1And enThe signal e of subsequent point is predicted according to the value of the K determined in step 3
'n+1；
Step 5, the e of operation output will be acquiredn+1With prediction e 'n+1Carry out difference operation；
Step 6, when the absolute difference of step 5 is less than or equal to preset limits of error value Δ emaxWhen, take en+1As
The virtual value of signal, return to step 2；
Step 7, when the absolute difference of step 5 is more than preset limits of error value Δ emaxWhen, Schilling en+1=e 'n+1；
Step 8, the signal e exported by step 2nAnd en+2Predict the centre signal e " of a bitn+1；
Step 9, by the e in step 7n+1With prediction e "n+1Carry out difference operation；
Step 10, when the absolute difference of step 9 is less than or equal to preset limits of error value Δ emaxWhen, take en+1=
e'n+1As the virtual value of signal, return to step 2；
Step 11, when the absolute difference of step 9 is more than preset limits of error value Δ emaxWhen, Schilling en+1=(e 'n+1+
e″n+1)/2, return to step 2.
2. being based on a kind of switching power converters parameter recorder filtering method described in claim 1, characterized in that step 2
In adaptive cancellation formula be
E (n)=d (n)-k*N1(n)
In formula, d (n) indicates the sampled value of measured signal, N1(n) sampled value of noise signal is indicated, k is adaptation coefficient, initially
It is operation output signal that value, which is set as 1, e (n),.
3. being based on a kind of switching power converters parameter recorder filtering method described in claim 1, characterized in that step 3
The process of the value of adaptation coefficient K is in middle determining adaptive cancellation formula：
Step 3.1, output signal is carried out Fast Fourier Transform (FFT) (FFT), original time-domain signal is converted into frequency domain letter
Number；
Step 3.2, the ratio for calculating signal and resultant signal of the frequency more than 20HZ in frequency-region signal, when first time ratio is more than 1/
When 20, adaptation coefficient K increases by 0.1, conversely, the value of adaptation coefficient K is constant；
Step 3.3, when frequency is last more than the odds ratio of the signal of 20HZ and resultant signal small in frequency-region signal next time, from
Accommodation coefficient K increases by 0.1, until minimum value occurs in the ratio of signal of the frequency more than 20HZ and resultant signal in frequency-region signal；Instead
It, reduces the value of adaptation coefficient K, until minimum occurs in the ratio of signal of the frequency more than 20HZ and resultant signal in frequency-region signal
Value.
4. being based on a kind of switching power converters parameter recorder filtering method described in claim 1, characterized in that step 5
In difference operation formula be
Δ e=| e 'n+1-en+1|
Δ e ＜=Δ emax
In formula, Δ e indicates acquisition operation output signal en+1With prediction output signal e 'n+1The size of the absolute value of difference, Δ emax
For limits of error value, value range is 0.01≤Δ emax≤1。
5. a kind of switch electricity designed based on a kind of switching power converters parameter recorder filtering method described in claim 1
Source converter parameter recorder device, it is characterised in that：Including input terminal sampling module, switching power converters, temperature sensing
Device module, output end sampling module, processor module, non-volatile memory module, independent current source module and usb interface module；
The output end of input terminal sampling module and output end sampling module is connect with processor module；Switching power converters pass through
Temperature sensor module is connect with processor module；The output end of processor module is connect with non-volatile memory module；It is independent
Power module outlet connect power supply with non-volatile memory module；Non-volatile memory module output end and usb interface module
Connection.
6. a kind of switching power converters parameter recorder device according to claim 5, it is characterised in that：The input
It includes 1A/D converters, the 1st differential amplifier circuit, the 1st noise samples circuit, the 1st voltage sensor, capacitance to hold sampling module
One end of C1 and inductance R1, the capacitance C1 connect voltage input end, which connects resistance R1, the 1st noise samples circuit simultaneously
The 1st noise samples circuit, the 1st voltage sensor, electricity are connected with the other end of one end of the 1st voltage sensor, the capacitance C1
Press the other end of input terminal and ground connection；The input terminal of the other end connecting valve supply convertor of resistance R1, which connects simultaneously
The other end of 1st differential amplifier circuit；1st differential amplifier circuit, the 1st noise samples circuit and the 1st voltage sensor
Output end is connect with the input terminal of 1A/D converters simultaneously；The output end of 1A/D converters and the input terminal of processor module
Connection.
7. a kind of switching power converters parameter recorder device according to claim 5, it is characterised in that：The output
It includes 2A/D converters, the 2nd differential amplifier circuit, the 2nd noise samples circuit, the 2nd voltage sensor, capacitance to hold sampling module
One end of C2 and resistance R2, the capacitance C2 connect voltage output end, which connects resistance R2, the 2nd noise samples circuit simultaneously
One end of device and the 2nd voltage sensor；The other end of the capacitance C2 connect the 2nd noise samples circuit and the 2nd voltage sensor,
The other end of voltage output end and ground connection；The input terminal of the other end connecting valve supply convertor of resistance R2, which connects simultaneously
Connect the 2nd another input terminal of differential amplifier circuit；2nd differential amplifier circuit, the 2nd noise samples circuit and the 2nd voltage sensor
The output end of device is connect with the input terminal of 2A/D converters simultaneously；The output end of 2A/D converters connects with processor module
It connects.
8. a kind of switching power converters parameter recorder device according to claim 5, it is characterised in that：The processing
Device module and the mode that non-volatile memory module is light-coupled isolation communication connection.
9. a kind of switching power converters parameter recorder device according to claim 5, it is characterised in that：The temperature
Sensor assembly includes at least 2 temperature sensors, and temperature sensor is mounted on the inductance, metal-oxide-semiconductor, change of switching power converters
Near depressor and rectifier diode.
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