CN101499735A - High resolution input apparatus, frequency transformer system having the apparatus and processing method for analogue input voltage signal - Google Patents
High resolution input apparatus, frequency transformer system having the apparatus and processing method for analogue input voltage signal Download PDFInfo
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Abstract
The invention provides a high-resolution input device and a frequency converter system with the high-resolution input device, wherein, the frequency converter system comprises a voltage polarity judgment unit used for judging the polarity of analog input voltages; a precise full-wave rectification unit used for converting the analog input voltage signal into an absolute value signal; a voltage benchmark comparison unit used for receiving the absolute value signal and comparing the absolute value signal with at least a voltage critical value so as to judge the voltage range of the absolute value signal; a DC compensation control unit used for adjusting the DC compensation quantity of the absolute value signal according to the voltage range of the absolute value signal; an in-phase addition unit used for receiving the absolute value signal and the DC compensation quantity and gaining a digital counting result by A/D conversion after DC compensating the absolute value signal and fixedly amplifying the gain; and a micro-controller used for inversely calculating the analog input voltage according to a polarity signal, the voltage range of the absolute value signal and the digital counting result. Meanwhile, the invention discloses a method for processing the analog input voltage signal of the frequency converter system.
Description
Technical field
The relevant a kind of converter technology field of the present invention refers to a kind of high-resolution input unit especially, has the processing method of the frequency convertor system and the analog input voltage signal thereof of this device.
Background technology
Frequency converter is for after being converted to direct current with the AC power rectification of fixed frequency and voltage, and direct current is converted to the device for converting electric energy that voltage and frequency are variable AC power.Direct current can be converted to AC power by frequency converter, so frequency converter is widely used in as application such as solar power system, electric motor car and UPSs; Because frequency converter can change voltage/frequency (V/f) simultaneously and change motor speed whereby, so frequency converter is widely used in as application such as refrigerating and air conditioning, high ferro and rapid transits to reach speed change or to increase the motor service efficiency to promote energy use efficiency.
Fig. 1 is the block diagram of known frequency convertor system, and main frame 10A can send the analog control signal for frequency converter 30A via analog input/output module 20A.Has an analog-digital converter (ADC in this frequency converter 30A, analog to digital converter) (not shown) is to convert this analog control signal to digital signal, and by microcontroller (MCU, micro controller unit) 300A is handled, with output voltage/frequency (V/f) of control of conversion device 30A.
Frequency converter now have mostly the external analog input voltage (10V～+ 10V) function of control output voltage frequency, but this analog input voltage must be by entering the analog input pin (input pin) of MCU again behind the proportional gain device.At present the operating voltage of general MCU be+5V or+3.3V, so this proportional gain is generally a fixing reduce in scale yield value.Fig. 2 is the analog input voltage signal V that illustrates further analog input/output module 20A
AIBe sent to the treatment situation of frequency converter 30A, this external analog input voltage signal V
AI21A (10V～+ 10V) via fixed proportion gain (P) be 1/4 noninverting amplifying circuit 22A with the linear corresponding conversion one-tenth-2.5V of input signal～+ 2.5V, provide the accurate position of direct current (level) of 2.5V to adjust through a DC compensation unit 23A again, with conversion of signals is become 0～+ 5V.Accurate voltage signal of adjusting of process direct current inputs to the analog input pin of MCU, accurate of being resolved the external analog input voltage by analog-digital converter (ADC) 24A of MCU inside.
For instance, if resolution is the reference voltage source V of its analog-digital converter of MCU (ADC) 24A of 10-bit
REFBe 5.12V, its lowest order (LSB, Least Significant Bit) voltage variety is 5mV (referring to a formula 1), if and during the error that provides of its databook ± 3LSB, when the accurate position of external analog input voltage was 1.00V, the A-D count value N scope that its MCU reads was 550 ± 3 (referring to formulas 2).
(formula 1)
A-D count value (N) is calculated as follows:
Therefore we can be by the counter scope of releasing the external analog input voltage of the A-D count value that MCU reads, and formula is suc as formula 3:
Figure 3 shows that the circuit unit that uses Fig. 2 is for V
AI(10V～+ 10V) analog digital transformation result, suppose that wherein resolution is 10-bit.When the A-D count value that reads as MCU was 550, the accurate position of its external analog input voltage scope was 1 ± 0.07V.Hence one can see that, the error of calculation amount of MCU itself has been exaggerated because of this fixed proportion gain (P=0.25＜1), consider that this error in measurement value is 0.07V under the situation of maximum error in measurement, when the accurate position of external analog input voltage is low more, this error in measurement rate then rises, in other words the accurate position of external analog input voltage is low more, and then the accuracy of its MCU detecting is low more; Can't reach accurate control when therefore externally the accurate position of analog input voltage is low.
Seeing table 1 can clearlyer find out, because the maximum of A-D conversion measures error amount and fixed proportion gain, MCU accuracy of judgement degree can descend and variation along with the analog input voltage value.
Table 1: consider following error rate and the accuracy of judging the external analog input voltage of the maximum error in measurement of MCU
| Analog input voltage V AI | MCU error in judgement rate | MCU accuracy of judgement degree |
| 1.00 | 7.0％ | 93.0％ |
| 0.80 | 8.75％ | 91.25％ |
| 0.60 | 11.7％ | 88.3％ |
| 0.40 | 17.5％ | 82.5％ |
| 0.20 | 35.0％ | 65.0％ |
| 0.10 | 70.0％ | 30.0％ |
Summary of the invention
Therefore another object of the present invention is the processing method that a kind of high-resolution input unit is provided, has the frequency convertor system and the analog input voltage signal thereof of this device, the processing method of this system and analog input voltage signal thereof can be done different DC compensation according to the scope of input analog signal, therefore all can provide gain to different accurate positions signals, can solve known technology whereby because the error problem that the amplifier gain deficiency is caused greater than 1.
For reaching above-mentioned purpose, the invention provides a kind of high-resolution input unit that is used for frequency convertor system, but the treatment of simulated input voltage signal, and result reached frequency convertor system, this device comprises:
The voltage quasi position comparing unit can compare this analog input voltage signal and at least one charge threshold level, to obtain voltage range signal;
DC compensation control unit is electrically connected to described voltage quasi position comparing unit, and can provide DC offset value with respect to this analog input voltage signal according to this voltage range signal; And
The in-phase adder unit is electrically connected to described DC compensation control unit, and does add operation earlier for this analog input voltage signal and this DC offset value, and gain is amplified so that analog input voltage signal in predetermined voltage range, fixes again.
The present invention also provides a kind of frequency convertor system with high-resolution input unit, can the treatment of simulated input voltage signal, and this system comprises:
The voltage quasi position comparing unit can compare this analog input voltage signal and at least one charge threshold level, to obtain voltage range signal;
DC compensation control unit is electrically connected to described voltage quasi position comparing unit, and can provide DC offset value with respect to this analog input voltage signal scope according to this voltage range signal;
The in-phase adder unit is electrically connected to described DC compensation control unit, and does add operation earlier for analog input voltage signal and DC offset value, and gain is amplified so that analog input voltage signal in predetermined voltage range, fixes again;
Analog digital converting unit is electrically connected to this in-phase adder unit, and does the analog digital conversion for the output of this in-phase adder unit; And
Microcontroller receives the voltage range signal of this voltage quasi position comparing unit output and receives the output of this analog digital converting unit, to calculate this analog input voltage signal.
The present invention further provides a kind of processing method of analog input voltage signal of frequency convertor system, this method comprises
(a) set up at least one charge threshold level;
(b) determine the voltage range of this analog input voltage signal according to this charge threshold level;
(c) according to the direct current accurate position offset of this voltage range decision for this analog input voltage signal;
(d) do add operation earlier for analog input voltage signal absolute value and DC offset value, gain is amplified so that the analog input voltage signal absolute value in predetermined voltage range, fixes again; And
(e) analog input voltage signal after amplifying is done the analog digital conversion to obtain digital counting.
Frequency convertor system with high-resolution input unit of the present invention comprises: polarity of voltage judging unit, accurate full-wave rectification unit, voltage quasi position comparing unit, DC compensation control unit, in-phase adder unit, analog digital converting unit and microcontroller.This polarity of voltage judging unit is for judging the polarity of analog input voltage.This precision full-wave rectification unit is converted to this analog input voltage signal the signal of absolute value.This voltage quasi position comparing unit receives the analog input voltage absolute value signal of this precision full-wave rectification unit output and compares with at least one charge threshold level (threshold), to judge the voltage range of analog input voltage absolute value signal.This DC compensation control unit is adjusted the DC compensation amount of analog input voltage absolute value signal according to the voltage range of this analog input voltage absolute value signal.After this homophase adder unit receives analog input voltage absolute value signal and DC compensation amount, through fixing gain amplifier and do analog digital and change and to obtain digital count value.This microcontroller can be according to the polar signal of analog input voltage, the voltage range and the digital count value inverse analog input voltage of analog input voltage absolute value signal.Moreover, if this analog input voltage signal on the occasion of, can save this polarity of voltage judging unit and this precision full-wave rectification unit, to simplify circuit design.
Frequency convertor system with high-resolution input unit of the present invention has following advantage:
1.MCU resolution improved 10 times.
2. when externally the accurate position of analog input voltage was low, frequency converter can reach accurate control.
3. promote the control precision of external analog input voltage.
4. can promote the usefulness of firmware filtering.
5. circuit framework is simple.
6. circuit design elasticity is good.
7. have wide range of applications, when be input as 0～+ 10V is also applicable, remove full-wave rectifying circuit from and get final product.
Description of drawings
Fig. 1 is the block diagram of known frequency convertor system;
Fig. 2 is the analog input voltage signal V of treatment of simulated input/output module
AICircuit diagram;
Figure 3 shows that the circuit unit that uses Fig. 2 is for V
AI(10V～+ 10V) analog digital transformation result (supposing that resolution is 10-bit);
Fig. 4 A is the frequency convertor system block diagram (V with high-resolution input unit according to preferred embodiment of the present invention
AI:-10V～+ 10V);
Fig. 4 B is the frequency convertor system block diagram (V with high-resolution input unit according to preferred embodiment of the present invention
AI: 0V～+ 10V);
Fig. 5 is the voltage-count value schematic diagram of key diagram 4A circuit operation;
Fig. 6 has the circuit block diagram of the frequency convertor system of variable input gain for realizing Fig. 4 A.
Description of reference numerals
Known technology:
Analog input voltage signal 21A non-inverting amplifier 22A
The present invention:
Analog input voltage signal 21 MCU 300
Voltage quasi position comparing unit 40 polarity of voltage judging units 42
Accurate full-wave rectification unit 44 DC compensation control unit 46
In-phase adder unit 50 analog digital converting unit 52
Embodiment
Referring to Fig. 4 A, be frequency convertor system block diagram with high-resolution input unit according to preferred embodiment of the present invention.The MCU300 of this frequency convertor system can receive the digital count value N, the voltage range signal X that handle through analog digital
InAnd polarity of voltage signal P
In, with accurate differentiation analog input voltage signal V
AI21 numerical value.This frequency convertor system comprises voltage quasi position comparing unit 40, polarity of voltage judging unit 42, accurate full-wave rectification unit 44, DC compensation control unit 46, in-phase adder unit 50, analog digital converting unit 52 in addition.This high-resolution input unit comprises voltage quasi position comparing unit 40, polarity of voltage judging unit 42, accurate full-wave rectification unit 44, DC compensation control unit 46, in-phase adder unit 50, analog digital converting unit 52.Wherein, DC compensation control unit 46 is electrically connected to described voltage quasi position comparing unit 40, and in-phase adder unit 50 is electrically connected to described DC compensation control unit 46.Wherein, DC compensation control unit 46 is electrically connected to described voltage quasi position comparing unit 40; In-phase adder unit 50 is electrically connected to described DC compensation control unit 46; Analog digital converting unit 52 is electrically connected to this in-phase adder unit 50
This polarity of voltage judging unit 42 receives this analog input voltage signal V
AI, to judge this analog input voltage signal V
AIPolarity, and export a polarity of voltage signal P
InTo this MCU300.
This precision full-wave rectification unit 44 receives this analog input voltage signal V
AI, and with the input voltage signal rectification for definitely on the occasion of (| V
AI|).This voltage quasi position comparing unit 40 can be with the analog input voltage signal absolute value | V
AI| (threshold) compares with at least one charge threshold level, to judge the analog input voltage signal absolute value | and V
AI| voltage fall into which voltage range (voltage range).This voltage quasi position comparing unit 40 is delivered to this DC compensation control unit 46 with voltage range information and is handled, and output voltage range signal X
InTo this MCU 300, wherein voltage range signal X
InCan instruction simulation input voltage signal absolute value | V
AI| voltage range.
This DC compensation control unit 46 provides the analog input voltage signal absolute value of these precision full-wave rectification unit 44 outputs | V
AI| the DC compensation amount, and adjust the analog input voltage signal absolute value according to the voltage range information of voltage quasi position comparing unit 40 output | V
AI| the DC compensation amount.For example, for making the analog input voltage signal absolute value | V
AI| be pre-determined constant scope (for example scope is 0-2V), if script analog input voltage signal absolute value | V
AI| scope be 2-4V, then DC offset value is-2V; If | V
AI| scope be 6-8V then DC offset value be-6V.
In-phase adder unit 50 comprises the noninverting adder of fixed gain, can be with the analog input voltage signal absolute value | V
AI| do add operation with the DC compensation amount, so that the analog input voltage signal absolute value | V
AI| be pre-determined constant scope (for example scope is 0-2V), and multiply by a current gain value (P that for example gains is 2.5), the signal after then will handling is electrically connected to this analog digital converting unit 52.This analog digital converting unit 52 is given this MCU300 with digital count value N and is handled after carrying out the analog digital conversion.
Moreover, referring to Fig. 4 B,, also can save polarity of voltage judging unit 42 and accurate full-wave rectification unit 44 in the present invention if analog input voltage signal is a positive.Only use this voltage quasi position comparing unit 40 promptly can be with analog input voltage signal V
AI(threshold) compares with at least one charge threshold level, to judge analog input voltage signal V
AIVoltage fall into which voltage range (voltage range), and produce voltage range signal X
In, voltage range signal is delivered to this DC compensation control unit 46 handle, and voltage range signal is electrically connected to this MCU 300, inform the voltage range of MCU analog input voltage signal this moment.This DC compensation control unit 46 is adjusted the DC compensation amount of analog input voltage signal according to the information of voltage range signal.Add operation is done with analog input voltage signal and DC compensation amount in in-phase adder unit 50, so that analog input voltage signal is pre-determined constant scope (for example scope is 0-2V), and multiply by a current gain value, the signal after then will handling is electrically connected to this analog digital converting unit 52.This analog digital converting unit 52 is given this MCU 300 with digital count value N and is handled after carrying out the analog digital conversion.
Fig. 5 is the voltage-count value schematic diagram of key diagram 4A circuit operation, because accurate full-wave rectification unit 44 takes absolute value input voltage signal, therefore can consider on the occasion of the half range magnitude of voltage (0～+ 10V), and the half range magnitude of voltage of negative value (10V～0V), can consider with symmetrical manner.Suppose on the occasion of half range magnitude of voltage (Half swing voltage) by 4 critical values (2V, 4V, 6V, 8V) be divided into 5 voltage ranges (0-2,2-4,4-6,6-8,8-10), and count value N is the 0-1023 numerical value by 10 bit representations.As analog input voltage signal V
AIBe 0～+ its magnification ratio yield value is 2.5 during 2V, and do not need the direct voltage compensation.As analog input voltage signal V
AIFor+2～+ during 4V, DC compensation control unit 46 provides the direct voltage compensation of negative value, and (compensation-2V), in-phase adder 50 is earlier with analog input voltage signal V
AIDo add operation with DC compensation voltage, make compensation voltage signal scope later be 0～+ 2V (i.e. this pre-determined constant scope), and the magnification ratio yield value still is 2.5.It is to promote MCU resolution that this result is equal to, voltage parsing amount by 1LSB is that the 20mV lifting is 1LSB=2mV, resolution has improved 10 times (because original Amplifier Gain is 0.25, be 2.5 now, therefore can improve 10 times of resolution), the accuracy when therefore relatively promoting MCU parsing external analog input voltage low level.As shown in Figure 5, the count value N that receives as MCU300 be 500 the time, possible analog input voltage signal V
AIFor-9V ,-7V ... ,+7V ,+9V.MCU 300 can be by polarity of voltage signal P
InLearn analog input voltage signal V
AIBe on the occasion of or negative value, by voltage range signal X
InKnow original analog input voltage signal absolute value | V
AI| or original analog input voltage signal V
AIBe to drop on which scope, MCU can computing obtain correct analog input voltage signal value.
Referring to Fig. 6, has the circuit block diagram of the frequency convertor system of high-resolution input unit for realizing Fig. 4 A.This precision full-wave rectification unit 44 can cooperate rectifier diode to form with U1B by amplifier U1A; This voltage quasi position comparing unit 40 for example can be made of voltage comparator integrated circuit (IC) LM 239, and each comparator input receives this analog input voltage signal absolute value in the voltage comparator ic, and another input receives charge threshold level (forming by electric resistance partial pressure), with the analog input voltage signal absolute value | and V
AI| compare with predetermined charge threshold level, to produce voltage range signal X
In(be the I/O 2～I/O5) among Fig. 6; This polarity of voltage judging unit 42 for example can be made of voltage comparator (LM311), and produces polarity of voltage signal P
In(being the I/O 1 among Fig. 6); This DC compensation control unit 46 is by 4 PNP transistors (Q1-Q4) and suitable resistance coupling and operational amplifier U1C formation, these 4 PNP transistors (Q1-Q4) are subjected to the control of voltage quasi position comparing unit 40 outputs (I/O 2～I/O 5), and in-phase adder unit 50 is made of suitable resistance coupling and amplifier U1D.
Moreover with reference to figure 4A and Fig. 4 B, the present invention also provides a kind of processing method of analog input voltage signal of frequency convertor system.This method treatment of simulated input voltage signal, and comprise the following step:
(a) set up at least one charge threshold level;
(b) determine the voltage range of this analog input voltage signal according to this charge threshold level;
(c) according to the direct current accurate position offset of this voltage range decision for this analog input voltage signal;
(d) do add operation earlier for analog input voltage signal and DC offset value, gain is amplified so that analog input voltage signal in predetermined voltage range, fixes again;
(e) analog input voltage signal after amplifying is done the analog digital conversion to obtain digital counting; And
(f) according to this voltage range of this digital counting and this analog input voltage signal, calculate this analog input voltage signal.
According to an alternative embodiment of the invention, this method treatment of simulated input voltage signal, and comprise the following step:
(a) set up at least one charge threshold level;
(b) determine the polarity of this analog input voltage signal and this analog input voltage signal done full-wave rectification to obtain the analog input voltage signal absolute value
(b1) determine the voltage range of this analog input voltage signal absolute value according to this charge threshold level;
(c) according to this accurate position of voltage range decision direct current offset, to adjust this analog input voltage signal absolute value to predetermined voltage range;
(d) do add operation earlier for analog input voltage signal absolute value and DC offset value, gain is amplified so that the analog input voltage signal absolute value in predetermined voltage range, fixes again;
(e) analog input voltage signal after amplifying is done the analog digital conversion to obtain digital counting; And
(f) according to the polarity of this digital counting, this analog input voltage signal and this voltage range of this analog input voltage signal absolute value, calculate this analog input voltage signal.
In above-mentioned two method embodiment, the gain of this amplification procedure is the numerical value greater than 1, for example can be 2.5.
Tabulate down 2 is the accuracy of judgement degree that have the frequency convertor system of high-resolution input for fixing ± 3LSB margin of error according to of the present invention.By the comparative result of table 2, when the accurate position of external analog input voltage is low, use technology of the present invention can promote the accuracy that MCU judges the external analog input voltage with table 1.
Table 2: the present invention is considering following error rate and the accuracy of judging the external analog input voltage of the maximum error in measurement of MCU
| Analog input voltage V AI | MCU error in judgement rate | MCU accuracy of judgement degree |
| 1.00 | 0.7％ | 99.3％ |
| 0.80 | 0.9％ | 99.1％ |
| 0.60 | 1.2％ | 98.8％ |
| 0.40 | 1.8％ | 98.3％ |
| 0.20 | 3.5％ | 96.5％ |
| 0.10 | 7.0％ | 93.0％ |
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (18)
1. high-resolution input unit, but treatment of simulated input voltage signal, and result reached frequency convertor system, it is characterized in that, comprise:
The voltage quasi position comparing unit can compare this analog input voltage signal and at least one charge threshold level, to obtain voltage range signal;
DC compensation control unit is electrically connected to described voltage quasi position comparing unit, and can provide DC offset value with respect to this analog input voltage signal according to this voltage range signal; And
The in-phase adder unit is electrically connected to described DC compensation control unit, and does add operation earlier for this analog input voltage signal and this DC offset value, and gain is amplified so that analog input voltage signal in predetermined voltage range, fixes again.
2. high-resolution input unit as claimed in claim 1 is characterized in that, also comprises:
The polarity of voltage judging unit receives this analog input voltage signal, and the output voltage polar signal; And
This analog input voltage signal can be done accurate full-wave rectification in accurate full-wave rectification unit, obtaining the analog input voltage signal absolute value, and offers this voltage quasi position comparing unit, with this charge threshold level relatively.
3. high-resolution input unit as claimed in claim 1 is characterized in that, described DC compensation control unit can provide a DC offset value to adjust this analog input voltage signal to predetermined voltage range.
4. high-resolution input unit as claimed in claim 1, it is characterized in that, described voltage quasi position comparing unit comprises most comparator, and this analog input voltage signal of input reception of each comparator, and another input receives charge threshold level.
5. high-resolution input unit as claimed in claim 1 is characterized in that, described DC compensation control unit comprises transistor, impedance and one group of operational amplifier of most.
6. frequency convertor system with high-resolution input unit can the treatment of simulated input voltage signal, it is characterized in that, comprises:
The voltage quasi position comparing unit can compare this analog input voltage signal and at least one charge threshold level, to obtain voltage range signal;
DC compensation control unit is electrically connected to described voltage quasi position comparing unit, and can provide DC offset value with respect to this analog input voltage signal scope according to this voltage range signal;
The in-phase adder unit is electrically connected to described DC compensation control unit, and does add operation earlier for analog input voltage signal and DC offset value, and gain is amplified so that analog input voltage signal in predetermined voltage range, fixes again;
Analog digital converting unit is electrically connected to this in-phase adder unit, and does the analog digital conversion for the output of this in-phase adder unit; And
Microcontroller receives the voltage range signal of this voltage quasi position comparing unit output and receives the output of this analog digital converting unit, to calculate this analog input voltage signal.
7. the frequency convertor system with high-resolution input unit as claimed in claim 6 is characterized in that, more comprises:
The polarity of voltage judging unit receives this analog input voltage signal, and the output voltage polar signal is to described microcontroller; And
Accurate full-wave rectification is done with this analog input voltage signal in accurate full-wave rectification unit, obtains the analog input voltage signal absolute value, and offers this voltage quasi position comparing unit, to compare with this charge threshold level.
8. the frequency convertor system with high-resolution input unit as claimed in claim 7, it is characterized in that, described DC compensation control unit can be according to this voltage range signal, provide DC offset value with respect to this analog input voltage signal scope, to adjust this analog input voltage signal absolute value to predetermined voltage range.
9. the frequency convertor system with high-resolution input unit as claimed in claim 8 is characterized in that, described microcontroller further receives this polarity of voltage signal to calculate this analog input voltage signal.
10. the frequency convertor system with high-resolution input unit as claimed in claim 6, it is characterized in that, described voltage quasi position comparing unit comprises most comparator, and this analog input voltage signal of input reception of each comparator, and another input receives charge threshold level.
11. the frequency convertor system with high-resolution input unit as claimed in claim 6 is characterized in that, this DC compensation control unit comprises most transistor, impedance and operational amplifier.
12. the processing method of the analog input voltage signal of a frequency convertor system is characterized in that, comprises
(a) set up at least one charge threshold level;
(b) determine the voltage range of this analog input voltage signal according to this charge threshold level;
(c) according to the direct current accurate position offset of this voltage range decision for this analog input voltage signal;
(d) do add operation earlier for analog input voltage signal and DC offset value, gain is amplified so that analog input voltage signal in predetermined voltage range, fixes again; And
(e) analog input voltage signal after amplifying is done the analog digital conversion to obtain digital counting.
13. the processing method of the analog input voltage signal of frequency convertor system as claimed in claim 12 is characterized in that, more comprises:
According to this voltage range of this digital counting and this analog input voltage signal, calculate this analog input voltage signal.
14. the processing method of the analog input voltage signal of frequency convertor system as claimed in claim 12 is characterized in that, more comprises:
In the polarity of preceding this analog input voltage signal of decision of step (b) and this analog input voltage signal done full-wave rectification to obtain the analog input voltage signal absolute value.
15. the processing method of the analog input voltage signal of frequency convertor system as claimed in claim 14 is characterized in that, this processing method more comprises:
(b1) determine the voltage range of this analog input voltage signal absolute value according to this charge threshold level;
(c1) according to this accurate position of voltage range decision direct current offset, to adjust this analog input voltage signal absolute value to predetermined voltage range.
16. the processing method of the analog input voltage signal of frequency convertor system as claimed in claim 15 is characterized in that, more comprises:
(d1) for amplifying through the accurate position of direct current compensated analog input voltage signal absolute value;
(e1) analog input voltage signal after amplifying is done the analog digital conversion to obtain digital counting; And
(f1) according to the polarity of this digital counting, this analog input voltage signal and this voltage range of this analog input voltage signal absolute value, calculate this analog input voltage signal.
17. the processing method of the analog input voltage signal of frequency convertor system as claimed in claim 12 is characterized in that, the gain amplifier of described amplification procedure (d) is greater than 1.
18. the processing method of the analog input voltage signal of frequency convertor system as claimed in claim 16 is characterized in that, the gain amplifier of described amplification procedure (d) is 2.5.
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| CN105335739A (en) * | 2015-12-08 | 2016-02-17 | 北京集创北方科技有限公司 | Fingerprint image optimization method |
| CN105469066A (en) * | 2015-12-08 | 2016-04-06 | 北京集创北方科技有限公司 | Fingerprint identification dynamic range optimizing method and equipment |
| CN105469066B (en) * | 2015-12-08 | 2017-06-06 | 北京集创北方科技股份有限公司 | A kind of fingerprint recognition dynamic range optimization method and equipment |
| CN105335739B (en) * | 2015-12-08 | 2019-06-14 | 北京集创北方科技股份有限公司 | A kind of fingerprint image optimization method |
| CN108446098A (en) * | 2016-01-04 | 2018-08-24 | 湖南工业大学 | The method for seeking ratio value between two input voltages |
| CN108446098B (en) * | 2016-01-04 | 2022-03-18 | 湖南工业大学 | Method for calculating proportional value between two input voltages |
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Application publication date: 20090805 |