CN108226620A - A kind of voltage sensor signal conditioning circuit - Google Patents
A kind of voltage sensor signal conditioning circuit Download PDFInfo
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- CN108226620A CN108226620A CN201611200153.6A CN201611200153A CN108226620A CN 108226620 A CN108226620 A CN 108226620A CN 201611200153 A CN201611200153 A CN 201611200153A CN 108226620 A CN108226620 A CN 108226620A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
The invention discloses a kind of voltage sensor signal conditioning circuit, the signal to be exported to multiple voltage sensors improves, and so as to simplify the structure of signal conditioning circuit, reduces cost.The voltage sensor signal conditioning circuit includes：The multiple signal processing units being connect respectively with multiple voltage sensors, the variable connector selecting module being connect with the multiple signal processing unit and the output unit being connect with the variable connector selecting module；Wherein, the analog signal that the signal processing unit is used to export voltage sensor is converted into digital signal；The variable connector selecting module is used to determine the sequence of the digital signal output of the multiple signal processing unit output；The output unit is used to be filtered the digital signal that the variable connector selecting module exports, export digital signal after compensation deals.
Description
Technical field
The present invention relates to sensor technical field more particularly to a kind of voltage sensor signal conditioning circuits.
Background technology
Sensor is a kind of sophisticated sensor setting for being widely used in each control field.The signal condition of sensor is
Refer to the digital signal for analog signal being transformed to can be utilized for data acquisition, control process and other purposes.It specifically includes
Change input signal using circuits such as wave filter, converter, amplifiers and export.Because the signal in industrial circle is respectively provided with
The features such as high pressure, overcurrent, surge so as to cannot correctly be identified by system, are needed to be adjusted and be cleared up, could be by system just
Really identification.
Generally, A/D converter (ADC) can only receive a certain range of analog signal, and sensor is non-electrical physics
Quantitative change, might not be within the range ability of A/D converter, therefore into after electric signal, the signal that is exported by sensor
Needed after the protections filtering measure such as amplifying, filtering, compensate, be isolated according to different situations, could be sent into A/D converter into
Row subsequent processing.
It is all analog signal that traditional sensor signal conditioning circuit, which is typically entered, exported, simple in structure, function is single.
When needing to detect multiple signals by multiple sensors in a system, since the model of sensor has very much, and when scene
When sensor is more, it is necessary to which multiple signals modulate circuit uses simultaneously, i.e., is directed to the signal tune of sensor in the prior art
The signal that a sensor input can only be directed in reason is improved, and when there is multiple sensors, then needs multiple structures identical
Or similar modulate circuit improves multiple signals for wearing sensor, so as to cause the complexity of system and improve
Cost.
Invention content
The present invention provides a kind of voltage sensor signal conditioning circuit, to the letter exported to multiple voltage sensors
It number is improved, so as to simplify the structure of signal conditioning circuit, reduces cost.
A kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention, for multiple voltage sensors
Signal improved, the voltage sensor signal conditioning circuit includes：
The multiple signal processing units being connect respectively with multiple voltage sensors connect with the multiple signal processing unit
The variable connector selecting module connect and the output unit being connect with the variable connector selecting module；Wherein,
The analog signal that the signal processing unit is used to export voltage sensor is converted into digital signal；
The variable connector selecting module is used to determine the digital signal output of the multiple signal processing unit output
Sequentially；
The output unit is for the digital signal that the variable connector selecting module exports to be filtered, compensation deals
Digital signal is exported afterwards.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the signal processing unit include with the sequentially connected amplification module of output terminal of voltage sensor, the first isolation module,
A/D converter, the output terminal of the output terminal of the A/D converter as the signal processing unit；
Wherein, the amplification module be used for by connect with the amplification module voltage sensor output analog signal into
Row amplification or attenuation processing；
First isolation module is used to the analog signal received carrying out Denoising disposal；
The analog signal of voltage value that the A/D converter is used to export the first isolation module is converted to digital letter
Number.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the voltage sensor signal conditioning circuit further includes：
The gain control module being connected between the signal processing unit output terminal and the variable connector selecting module,
The gain control module is also connect with the amplification module in each signal processing unit；
The gain control module is used to receive the digital signal that A/D converter exports in multiple signal processing units,
And when each digital signal not preset threshold range of the A/D converter in the signal processing unit of reception, to this
Amplification module in signal processing unit is amplified or adjustable attenuation, when the digital signal of reception is in the signal processing unit
A/D converter preset threshold range in when, the digital signal is exported to the variable connector selecting module.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the gain control module includes：Signal acquisition circuit, mean value computation circuit and gain adjustment circuit；
The digital signal that the signal acquisition circuit is used to export each signal processing unit is acquired and stores；
The digital signal that the mean value computation circuit is used to acquire each signal processing unit is averaged；
The gain adjustment circuit is used to be less than A/D converter in the signal processing unit when the determining average value
The minimum value of predetermined threshold value then controls the amplification module in the signal processing unit to be amplified processing to analog signal, when true
The fixed average value is more than the maximum value of the predetermined threshold value of A/D converter in the signal processing unit, then controls at the signal
The amplification module managed in unit carries out attenuation processing to module by signal, when determining the average bits in the signal processing unit
When between the minimum value and maximum value of the predetermined threshold value of A/D converter, the average value of the digital signal is exported to multichannel
Switch selecting module.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the gain control module includes and the multiple signal processing unit multiple gain control submodules correspondingly, institute
It states each gain control submodule and includes the signal acquisition circuit, mean value computation circuit and gain adjustment circuit.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the output unit includes：Filter module sequentially connected with the variable connector selecting module and compensating module, the benefit
Repay first output terminal of the output terminal as the output unit of module；
Wherein, the filter module is used to the digital signal that the variable connector selecting module exports being filtered place
Reason；
The compensating module is used for the digital signal for exporting the filter module and carries out nonlinear compensation.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the output unit further includes：
The D/A converter of the compensating module output terminal is connected to, described in the output terminal of the D/A converter is used as
The second output terminal of output unit；
The D/A converter is used to the digital signal after compensating being converted to analog signal and export.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, the output unit further includes：
The second isolation module being connected between the compensating module and the D/A converter；
Second isolation module is used to the digital signal received carrying out Denoising disposal.
In a kind of possible embodiment, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, it is different from the model of the voltage sensor of each signal processing unit connection.
The present invention has the beneficial effect that：
In a kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention, including：It is passed with multiple voltage-types
Multiple signal processing units that sensor connects respectively, the variable connector selecting module being connect with the multiple signal processing unit,
And the output unit being connect with the variable connector selecting module；Wherein, the signal processing unit is used to pass voltage-type
The analog signal of sensor output is converted into digital signal；The variable connector selecting module is used to determine the multiple signal processing
The sequence of the digital signal output of unit output；The output unit is used for the number for exporting the variable connector selecting module
Signal is filtered, exports digital signal after compensation deals.Therefore, the voltage sensor signal tune in the embodiment of the present invention
It manages in circuit, when the signal for having multiple voltage sensors is improved, by mould each in multiple voltage sensors
Variable connector selecting module is sent to after being converted to digital signal after the processing that plan signal passes through signal processing unit, by multichannel
Digital signal is sequentially output to output unit, compared with the prior art, for each voltage-type by the processing of switch selecting module
Sensor is required to the complicated circuit of an individual output unit, voltage sensor signal tune provided in an embodiment of the present invention
Reason circuit passes through a variable connector selecting module and output unit by the signal for exporting multiple signal processing units, from
And signal conditioning circuit is simplified, and save cost.
Description of the drawings
Fig. 1 is a kind of structure diagram of voltage sensor signal conditioning circuit provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of second of voltage sensor signal conditioning circuit provided in an embodiment of the present invention；
Fig. 3 is the structure diagram of the third voltage sensor signal conditioning circuit provided in an embodiment of the present invention；
Fig. 4 is the structure diagram of gain control module provided in an embodiment of the present invention；
Fig. 5 is the structure diagram of the 4th kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention；
Fig. 6 is the structure diagram of the 5th kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention；
Fig. 7 is the structure diagram of the 6th kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing into
It is described in detail to one step, it is clear that described embodiment is only the implementation of part of the embodiment of the present invention rather than whole
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
All other embodiment, shall fall within the protection scope of the present invention.
The present invention provides a kind of voltage sensor signal conditioning circuit, to the letter exported to multiple voltage sensors
It number is improved, so as to simplify the structure of signal conditioning circuit, reduces cost.
A kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention, for multiple voltage sensors
Signal improved, voltage sensor signal conditioning circuit includes：It is connect respectively with multiple voltage sensors multiple
Signal processing unit 01, the variable connector selecting module 02 being connect with multiple signal processing units 01 and with variable connector select
Select the output unit 03 of the connection of module 02 (output unit 03 connects leading-out terminal OUTPUT)；Wherein, signal processing unit 01 is used
In being converted into digital signal to the analog signal that voltage sensor exports；Variable connector selecting module 02 is used to determine multiple letters
The sequence of the digital signal output of number processing unit output；Output unit 03 is used for the number for exporting variable connector selecting module
Signal is filtered, exports digital signal after compensation deals.Wherein, three signal processing units are only illustrated in Fig. 1, but not
It is limited to only to include three signal processing units.
In a kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention, including：It is passed with multiple voltage-types
Multiple signal processing units that sensor connects respectively, the variable connector selecting module being connect with multiple signal processing units and
The output unit being connect with variable connector selecting module；Wherein, signal processing unit is used for the mould exported to voltage sensor
Intend signal and be converted into digital signal；Variable connector selecting module is used to determine that the digital signal of multiple signal processing unit outputs is defeated
The sequence gone out；Output unit for the digital signal that variable connector selecting module exports is filtered, after compensation deals by number
Word signal exports.Therefore, it in the voltage sensor signal conditioning circuit in the embodiment of the present invention, is sensed when there is multiple voltage-types
When the signal of device is improved, processing that analog signal each in multiple voltage sensors is passed through into signal processing unit
Variable connector selecting module is sent to after conversion digital signal afterwards, the processing by variable connector selecting module by digital signal according to
It is secondary to export to output unit, compared with the prior art, an individual output unit is required to for each voltage sensor
Complicated circuit, voltage sensor signal conditioning circuit provided in an embodiment of the present invention passes through multiple signal processing units are defeated
The signal gone out by a variable connector selecting module and output unit, so as to simplify signal conditioning circuit, and saves
Cost.
Referring to Fig. 2, in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention, signal processing unit
01 includes the sequentially connected amplification module 011 of output terminal, the first isolation module 012, the A/D converter with voltage sensor
(ADC) 013, the output terminal of the output terminal of A/D converter as signal processing unit；Wherein, amplification module 011 is for will be with
The analog signal of the voltage sensor output of amplification module connection is amplified or attenuation processing；First isolation module 012
For the analog signal received to be carried out Denoising disposal；A/D converter 013 is used for the voltage for exporting the first isolation module
The analog signal of value is converted to digital signal.
Wherein, in signal processing unit shown in Fig. 2, if the signal of voltage sensor output need not be carried out at denoising
During reason, the first isolation module can be removed, therefore, signal processing unit can not include the first isolation module.Preferably, it is
Denoising disposal of the signal that sensor exports there are interference signals such as noises by the first isolation module is avoided, so as to reach
The glitch-free purpose of signal.
Specifically, since A/D converter 013 has one's own input range range and output range range,
Therefore it in order to avoid the analog signal of sensor acquisition is not in the range of the input range of subsequent A/D converter 013, needs
It is amplified or decays by amplification module 011.Amplification module 011 is used for the mould exported to the voltage sensor received
Intend signal to be amplified or decay.Specifically, the analog signal that microminiature current sensor acquires is amplified so that amplification
Analog signal afterwards decays in the range ability of subsequent A/D converter or by larger analog signal so that
Analog signal after attenuation is in the range ability of subsequent A/D converter.
Wherein, the first isolation module can cut off earth-return circuit by transformer, light or capacitative coupling technique, so as to
The signals such as isolated high voltage, surge, pulse and higher common-mode voltage, so as to play the purpose of protection circuit removal noise.
In a particular embodiment, in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention, referring to
Fig. 3, voltage sensor signal conditioning circuit further include：It is connected to 01 output terminal of signal processing unit and selects mould with variable connector
Gain control module 04 between block 02, gain control module 04 also connect with the amplification module 011 in each signal processing unit
It connects；Gain control module is used to receive the digital signal that A/D converter exports in multiple signal processing units, and when reception
Each digital signal not the preset threshold range of the A/D converter in the signal processing unit when, to the signal processing list
Amplification module in member is amplified or adjustable attenuation, when analog/digital of the digital signal in the signal processing unit of reception turns
When in the preset threshold range of parallel operation, digital signal is exported and gives variable connector selecting module.
Further, can data solution be carried out by subsequent module in order to which the digital signal of A/D converter output will be passed through
Analysis, preferably, by A/D converter export digital signal need set preset threshold range in, you can be arranged on mould/
Half of number converter range or so.Therefore, reach this in order to which the transformed digital signal of A/D converter progress will be passed through
The half of A/D converter range, gain control module need that the digital signal that A/D converter exports is identified, when
Determine that the digital signal in half of range or so, then directly exports digital signal, when determining the digital signal not in range
Half or so when, need to feed back to amplification module, after the amplification or attenuation of amplification module again so that analog/digital turns
The digital signal of parallel operation output is in preset threshold range.Wherein, preset threshold range can be according to the analog/digital of different model
Converter is configured, preferably, the half of A/D converter maximum range can be arranged on or so, concrete numerical value is herein not
It is specifically limited.
In a particular embodiment, in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention, referring to
Fig. 4, gain control module 04 include：Signal acquisition circuit 041, mean value computation circuit 042 and gain adjustment circuit 043；Signal
The digital signal that Acquisition Circuit is used to export each signal processing unit is acquired and stores；Mean value computation circuit for pair
The digital signal of each signal processing unit acquisition is averaged；Gain adjustment circuit is used to be somebody's turn to do when the determining average value is less than
The minimum value of the predetermined threshold value of A/D converter in signal processing unit, then control the amplification module in the signal processing unit
Processing is amplified to analog signal, when determining that the average value is more than the default of A/D converter in the signal processing unit
The maximum value of threshold value then controls the amplification module in the signal processing unit to carry out attenuation processing to module by signal, when determining
State average bits in the signal processing unit between the minimum value and maximum value of the predetermined threshold value of A/D converter when, by number
The average value of word signal, which exports, gives variable connector selecting module.
Specifically, since gain control module receives the number letter of A/D converter output in multiple signal processing units
Number, therefore the port that gain control module is connect with each signal processing unit is mutual indepedent, and when one signal processing of reception
During digital signal in unit, there is whether corresponding output port will need the signal of amplification module is controlled to export again and give the letter
The amplification module of number processing unit, therefore gain control module has multiple input end and multiple output terminals.And believe by number
Carried out data transmission when number being sent to subsequent variable connector selecting module using mutually independent channel, multi-path choice is avoided to open
It is digital signal which signal processing unit is sent to close uncertain, therefore, gain control module and multiple signal processing units
The channel of connection is mutual indepedent, and the access being connect with variable connector selecting module is mutual indepedent.Signal acquisition circuit 041 is pre-
After if the multiple digital signals exported in a signal processing unit are received in the time, which is acquired and stored；
Mean value computation circuit 042 is directed to the multiple digital signals acquired in each signal processing unit and calculates average value；It is in order to enable flat
Mean value can well be parsed by subsequent circuit, avoid digital signal it is excessive cause A/D converter input saturation or
The too small range that cannot make full use of A/D converter of digital signal, gain adjustment circuit 043 are directed to each signal processing unit
The average value of calculating and the predetermined threshold value of A/D converter in the signal processing unit are compared, when determining the signal processing
It, then will by the channel corresponding to the signal processing unit when average value of digital signal in unit is in preset threshold range
Average value is sent to variable connector selecting module, when the average value for determining the data-signal in the signal processing unit is not default
In threshold range, then by feedback channel corresponding to the signal processing unit control amplification module be amplified or attenuation at
Reason.Wherein, preferably, preset threshold range could be provided as half of A/D converter range or so.For example, when analog/digital turns
The maximum output value of parallel operation is 3.3V, then predetermined threshold value can be 1.5V-1.6V, i.e. the minimum value of predetermined threshold value is 1.5V, in advance
If the maximum value of threshold value is 1.6V.When average bits are between 1.5V-1.6V, directly the average value of digital signal is carried out defeated
Go out, when the average value of digital signal is less than 1.5V, gain adjustment circuit 043 will send the order of amplified analog signal to amplification
Module is amplified analog signal so that the digital signal of output between 1.5V-1.6V, wherein, amplification factor according to
The average value of digital signal and the size of predetermined threshold value are calculated；When the average value of digital signal is more than 1.6V, Gain tuning
Circuit 043 to amplification module, decays to analog signal the order for sending reduced analog signal so that the number letter of output
Number between 1.5V-1.6V, attenuation multiple is calculated according to the average value of digital signal and the size of predetermined threshold value.It can
See, for the adjustment by gain control module so that the digital signal of output is located in preset threshold range, amplification module will no longer
It is amplified or decays.
In a particular embodiment, referring to Fig. 5, above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
In, gain control module 04 includes and multiple signal processing units multiple gain control submodules 040 (in Fig. 5 correspondingly
Only illustrate three, but be not limited to three gain control submodules), each gain control submodule include signal acquisition circuit,
Mean value computation circuit and gain adjustment circuit.Specifically, each gain control submodule 040 is for reception and the signal processing list
The digital signal of member corresponding A/D converter output, and when the digital signal received not the mould in the signal processing unit/
During the preset threshold range of number converter, the amplification module in the signal processing unit is amplified or adjustable attenuation, when connecing
When in the preset threshold range of A/D converter of the digital signal of receipts in the signal processing unit, by the digital signal
It exports to the variable connector selecting module.Specifically, each gain control submodule is only used for one signal processing list of control
Amplification module in member so that each gain control submodule is individually handed over the module in the signal processing unit into row information
Mutually.For example, with reference to Fig. 5, the gain control submodule in branch m1 only controls the amplification module 011 in m1；Increasing in branch m2
Beneficial control submodule 040 only controls the amplification module 011 in m2；Gain control submodule 040 in branch m3 is only controlled in m3
Amplification module 011.Wherein, each gain control submodule includes signal acquisition circuit, mean value computation circuit and Gain tuning
Three circuits of circuit, specifically, signal acquisition circuit, three circuits of mean value computation circuit and gain adjustment circuit function and on
It gives an account of and continues identical, details are not described herein.
In a particular embodiment, variable connector selecting module provided in an embodiment of the present invention is specifically used for：It determines to be received
Signal processing unit number, determine that each signal processing unit is defeated successively according to the number of signal processing unit to be received
Go out time and the sequence of digital signal.Specifically, due to field programmable gate array (Field-Programmable Gate
Array, FPGA) there is flexible control function, so the voltage sensor signal conditioning circuit based on FPGA can be simultaneously
Improve the digital signal of multiple signal processing units.But when the type or type of the sensor in each signal processing unit
Difference causes widely different, it is therefore desirable to individually carry out gain control and individually carry out the transmission of signal.Variable connector selects
Module then needs multiple digital signals being transmitted successively.Specifically, variable connector selecting module detects multiple signals first
Whether there is digital signal output in processing unit, when determining there is digital signal output in signal processing unit, and determine number
When signal is more than predetermined threshold value, it is determined that digital signal is effective in the signal processing unit, needs to carry out the transmission of data；Work as inspection
The signal processing unit number for needing to transmit is determined after having surveyed all signal processing units, and select according to signal processing unit number
Select time and the sequence of each signal processing unit transmission.For example, when being connect with variable connector selecting module, there are four at signal
Unit is managed, but determines that there are three signal processing units to export valid data by detecting, then according to certain in preset time
Sequence successively exports the data in three signal processing units to filter module.Wherein, it is defeated for each signal processing unit
The sequence gone out and time can be set according to actual conditions.For example, when the data that signal processing unit one transmits are more,
It can be transmitted to the signal processing unit more time；Alternatively, selection is complete by the data transmission in signal processing unit one
Afterwards, then by the data in signal processing unit two it is transmitted.Specific transmission time and sequence do not limit herein.
In a particular embodiment, in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention, referring to
Fig. 6, output unit 03 include：Filter module 031 sequentially connected with variable connector selecting module and compensating module 032, compensation
First output terminal of the output terminal of module 032 as output unit；Wherein, filter module 031 is used to variable connector selecting mould
The digital signal of block output is filtered；It is non-that compensating module 032 is used for the digital signal for exporting filter module 031 progress
Linear compensation.
Specifically, the filter module in the embodiment of the present invention can select suitable wave filter according to actual needs.Such as adopt
With simple low-pass filter, the signal-to-noise ratio of signal is improved, reduces the interference of the output to signal.Wherein, it is realized based on FPGA
The circuit of filtering is more flexible, and realization method type is more.It can be according to the speed of filtering rate, parameter and input signal
Rate and otherness select different types of wave filter.So as to widen the use scope of signal conditioning circuit.Specifically, compensation circuit
It mainly realizes gamma correction, realizes that gamma correction is the critical function improved sensor.Many sensors
Physical effect have it is non-linear, can gamma correction be realized by compensating module.For example, sensor is under normal conditions all to temperature
Degree is sensitive, while also has nonlinearity erron, therefore its error must be compensated under many application scenarios.Wherein, into
The method of row error compensation has very much, such as straight line penalty method, straight line end group penalty method and look-up table.
Preferably, it is non-that fitting function realization may be used in the mode compensated to the digital signal that filter module exports
Linear compensation.Appropriate fitting function is selected, by the use of the circuit of fitting function can be realized as a part for compensating module so that
In compensation range, sensor it is non-linear can substantially linear, error can be reduced within the scope of requirement.Fitting function
Remaining error can be limited in limited range, and the requirement to input signal is monambiguity by selection.Using continuous letter
Although number will carry out more mathematical operation as fitting function, error function is smooth, continuous, therefore result is easy to observe
Analysis.Common fitting function has:1/x, xm, lgx, Ax+Bx3Deng.Furthermore it is also possible to using with voltage sensor known to
The circuit of transfer function complementation realizes the nonlinear compensation of the sensor.Such as with the measured exponential function of logarithmic function compensation
Deng.
In a particular embodiment, in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention, referring to
Fig. 7, output unit further include：It is connected to the D/A converter (DAC) 033 of 032 output terminal of compensating module, D/A converter
Second output terminal of 033 output terminal as output unit；D/A converter is used to the digital signal after compensating being converted to mould
Intend signal and export.Specifically, it when the device of leading-out terminal connection can only receive analog signal, needs to pass through D/A switch
Digital signal after overcompensation is converted to analog signal and exported by device.As it can be seen that voltage-type provided in an embodiment of the present invention
Sensor signal conditioning circuit can be by the first output terminal output digit signals, and can export mould by second output terminal
Intend signal, so that the output of signal is more flexible, the device of receipt of subsequent is not had to be defined.Wherein, D/A switch
During the model of device has very much, it can be selected, be not specifically limited herein according to actual needs.
In a particular embodiment, in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention, referring to
Fig. 7, output unit further include：The second isolation module 034 being connected between compensating module 032 and D/A converter 033；The
Two isolation modules are used to the digital signal received carrying out Denoising disposal.Second isolation module can by transformer, light or
Capacitative coupling technique cuts off earth-return circuit, thus the signals such as isolated high voltage, surge, pulse and higher common-mode voltage,
So as to play the purpose of protection circuit removal noise.Therefore, signal conditioning circuit provided in an embodiment of the present invention, not only can be defeated
Go out digital signal, and analog signal can be exported, so as to reduce the restriction to leading-out terminal output equipment.
In a particular embodiment, it is and every in above-mentioned voltage sensor signal conditioning circuit provided in an embodiment of the present invention
The model of the voltage sensor of one signal processing unit connection is different.Specifically, for the voltage sensor of unlike signal,
Amplification module, Current Voltage modular converter, the first isolation module, A/D converter in each signal processing unit can also
It is different.
To sum up, in a kind of voltage sensor signal conditioning circuit provided in an embodiment of the present invention, including：With multiple voltages
Type sensor connects respectively and one-to-one multiple signal processing units, each signal processing unit include sensing with voltage-type
The sequentially connected amplification module of output terminal, the first isolation module, the A/D converter of device；With in each signal processing unit
The gain control module of the output terminal connection of A/D converter, the variable connector choosing being connect with the output terminal of gain control module
Module and the output unit being connect with the output terminal of variable connector selecting module are selected, output unit includes filter module, compensation
Module, wherein, gain control module is also connect with the amplification module in each signal processing unit；Wherein, amplification module is used for
The analog signal that the voltage sensor being connect with the amplification module exports is amplified or attenuation processing；A/D converter
For converting analog signals into digital signal；Gain control module is used to receive analog/digital conversion in multiple signal processing units
The digital signal of device output, and it is pre- when each digital signal not A/D converter in the signal processing unit received
If during threshold range, the amplification module in the signal processing unit is amplified or adjustable attenuation, when the digital signal of reception
When in the preset threshold range of the A/D converter in the signal processing unit, digital signal is exported and is selected to variable connector
Select module；Variable connector selecting module be used for by multiple digital signals that gain control module export carry out it is selective export to
Filter module；Filter module is used to be filtered the digital signal received, and export to compensating module, compensating module
For will be exported after filtered digital signal progress nonlinear compensation.Therefore, the voltage sensor in the embodiment of the present invention
It, will be in multiple voltage sensors when the signal for having multiple voltage sensors is improved in signal conditioning circuit
After each analog signal is amplified or is decayed by amplifying circuit, analog signal is converted into number by A/D converter
Gain control module is sent to after word signal, gain control module is according to the digital signal of reception and the number letter institute of reception
Control of the range of corresponding analog-digital converter to amplification module in the signal processing unit so that in the signal processing unit
The analog signal of sensor output meets the range of analog-digital converter, and output digit signals.Further, by by gain control
Multiple digital signals of molding block output are sent to variable connector selecting module, variable connector selecting module selectivity will be multiple
Digital signal is exported, and is sent to filter module, the filter action of filtered module and compensating module it is non-linear
Compensation, digital signal is exported.Therefore, the present invention is defeated by the A/D converter in each signal processing unit in implementing
The digital signal gone out is exported by gain control module, Multi-channel switch control module, filter module, compensating module, from
And the structure of modulate circuit is simplified, and save cost.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The shape of computer program product that usable storage medium is implemented on (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of voltage sensor signal conditioning circuit, improves for the signal to multiple voltage sensors, special
Sign is that the voltage sensor signal conditioning circuit includes：
The multiple signal processing units being connect respectively with multiple voltage sensors are connect with the multiple signal processing unit
Variable connector selecting module and the output unit being connect with the variable connector selecting module；Wherein,
The analog signal that the signal processing unit is used to export voltage sensor is converted into digital signal；
The variable connector selecting module is used to determine the sequence of the digital signal output of the multiple signal processing unit output；
The output unit will for the digital signal that the variable connector selecting module exports to be filtered, after compensation deals
Digital signal exports.
2. signal conditioning circuit according to claim 1, which is characterized in that it is characterized in that, the signal processing unit
Including amplification module sequentially connected with the output terminal of voltage sensor, the first isolation module, A/D converter, the mould/
Output terminal of the output terminal of number converter as the signal processing unit；
Wherein, the amplification module is used to put the analog signal that the voltage sensor connecting with the amplification module exports
Big or attenuation processing；
First isolation module is used to the analog signal received carrying out Denoising disposal；
The A/D converter is used to the analog signal that the first isolation module exports being converted to digital signal.
3. signal conditioning circuit according to claim 2, which is characterized in that the voltage sensor signal conditioning circuit
It further includes：
The gain control module being connected between the signal processing unit output terminal and the variable connector selecting module, it is described
Gain control module is also connect with the amplification module in each signal processing unit；
The gain control module is used to receive the digital signal that A/D converter exports in multiple signal processing units, and work as
Receive each digital signal not the preset threshold range of the A/D converter in the signal processing unit when, to the signal
Amplification module in processing unit is amplified or adjustable attenuation, when the digital signal of reception is in the signal processing unit
When in the preset threshold range of A/D converter, the digital signal is exported to the variable connector selecting module.
4. signal conditioning circuit according to claim 3, which is characterized in that the gain control module includes：Signal is adopted
Collector, mean value computation circuit and gain adjustment circuit；
The digital signal that the signal acquisition circuit is used to export each signal processing unit is acquired and stores；
The digital signal that the mean value computation circuit is used to acquire each signal processing unit is averaged；
The gain adjustment circuit is used for when determining that the average value is less than the default of A/D converter in the signal processing unit
The minimum value of threshold value then controls the amplification module in the signal processing unit to be amplified processing to analog signal, when determining
Maximum value of the average value more than the predetermined threshold value of A/D converter in the signal processing unit is stated, then controls the signal processing list
Amplification module in member carries out attenuation processing to module by signal, when determine the average bits in the signal processing unit mould/
When between the minimum value and maximum value of the predetermined threshold value of number converter, the average value of the digital signal is exported to variable connector
Selecting module.
5. signal conditioning circuit according to claim 4, which is characterized in that the gain control module include with it is described more
Multiple gain control submodules, each gain control submodule include the signal to a signal processing unit correspondingly
Acquisition Circuit, mean value computation circuit and gain adjustment circuit.
6. signal conditioning circuit according to claim 1, which is characterized in that the output unit includes：With the multichannel
The sequentially connected filter module of selecting module and compensating module are switched, the output terminal of the compensating module is as the output unit
The first output terminal；
Wherein, the filter module is used to the digital signal that the variable connector selecting module exports being filtered；
The compensating module is used for the digital signal for exporting the filter module and carries out nonlinear compensation.
7. signal conditioning circuit according to claim 6, which is characterized in that the output unit further includes：
The D/A converter of the compensating module output terminal is connected to, the output terminal of the D/A converter is as the output
The second output terminal of unit；
The D/A converter is used to the digital signal after compensating being converted to analog signal and export.
8. signal conditioning circuit according to claim 7, which is characterized in that the output unit further includes：
The second isolation module being connected between the compensating module and the D/A converter；
Second isolation module is used to the digital signal received carrying out Denoising disposal.
9. signal conditioning circuit according to claim 1, which is characterized in that the voltage being connect with each signal processing unit
The model of type sensor is different.
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| CN201611200153.6A CN108226620A (en) | 2016-12-22 | 2016-12-22 | A kind of voltage sensor signal conditioning circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611200153.6A CN108226620A (en) | 2016-12-22 | 2016-12-22 | A kind of voltage sensor signal conditioning circuit |
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| CN201611200153.6A Pending CN108226620A (en) | 2016-12-22 | 2016-12-22 | A kind of voltage sensor signal conditioning circuit |
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