CN109818621A - Voltage-to-digit converter and electric resistance sensor reading circuit - Google Patents

Abstract

A kind of voltage-to-digit converter and electric resistance sensor reading circuit, voltage-to-digit converter include: the switch module for being configured as being accessed or being turned off according to first control signal reference voltage and/or common-mode voltage；It is connect with switch module, is configured as carrying out the energy-storage module of charge or discharge according to reference voltage and common-mode voltage；It is connect with energy-storage module, is configured as after carrying out Δ ∑ modulation feedback to the charge that energy-storage module exports, exports the modulation module of integral voltage；And connect with modulation module, it is configured as obtaining the quantizer of digitally encoded signal to integral voltage progress quantification treatment according to second control signal；Modulation module in the embodiment of the present invention can realize that electric energy is multiplexed, reduce the total power consumption of voltage-to-digit converter, and the interference components in voltage conversion process can be filtered out by Δ ∑ modulation feedback, be conducive to the precision and resolution ratio that improve the digitally encoded signal of the quantizer output.

Description

Voltage-to-digit converter and electric resistance sensor reading circuit

Technical field

The invention belongs to electronic circuit technology fields more particularly to a kind of voltage-to-digit converter and electric resistance sensor to read Circuit.

Background technique

With the fast development of electronic technology, voltage detecting technology has obtained quick development；In actual application, Technical staff directly obtains the correlation performance parameters of testee, especially when the performance parameter of testee is with the shape of non electrical quantity When formula (such as pressure, stress, displacement, miniature deformation etc.) is presented, then the performance parameter of these non electrical quantities can only be converted to Voltage etc.；When obtaining the voltage value of testee, the quilt just can be derived that by the detection and analysis for the voltage value It surveys the working condition of object, for example the temperature of testee, pressure, wet can be derived that by the voltage value variable quantity of testee The volume of data such as degree and deformation；However handled, in analytic process in the voltage value for testee, pass through detection The voltage value for the testee that circuit detects is only an analog quantity, and technical staff can not directly carry out operation to the analog quantity Processing, needs to convert the analog quantity and digital signal, for example express the width of voltage analog by binary coded signal Value；Therefore the voltage detection method in traditional technology has to be converted to continuous voltage analog using digital quantizer outer Computer equipment identifiable digital signal in boundary's realizes the real-time processing function for voltage value by the digital signal.

In digital quantizer in the conventional technology, analog-to-digital conversion equipment needs a stable current source bias, passes through The current source realizes analog-digital conversion function to drive digital quantizer；If technical staff goes for higher signal-to-noise ratio, that Digital quantizer just has to using more powerful bias current, and which results in digital quantizer, there are biggish function Consumption；If so technical staff using certain methods reduce digital quantizer power consumption, then electronic component in digital quantizer Working condition will be greatly affected, digital quantizer output digital signal precision and resolution ratio you can't get Guarantee, relevant voltage value can not be accurately obtained by the digital signal, reduce the control precision and control of digital quantizer The usage experience of response speed, user is bad.

Summary of the invention

In view of this, the embodiment of the invention provides a kind of voltage-to-digit converter and electric resistance sensor reading circuit, purport Solving the voltage-to-digit converter in traditional technical solution, there are biggish power consumptions, and the stability of signal conversion is poor, with And the lower problem of precision and resolution ratio of the digital signal obtained by voltage-to-digit converter.

The first aspect of the embodiment of the present invention provides a kind of voltage-to-digit converter, comprising:

It is configured as that the switching molding of reference voltage and/or common-mode voltage is accessed or turned off according to first control signal Block；

Connect with the switch module, be configured as being carried out according to the reference voltage and the common-mode voltage charging or The energy-storage module of electric discharge；

It connect, is configured as after being modulated feedback to the charge that the energy-storage module exports with the energy-storage module, it is defeated The modulation module of integral voltage out；And

It is connect with the modulation module, is configured as carrying out quantification treatment to the integral voltage according to second control signal Obtain the quantizer of digitally encoded signal.

In one of them embodiment, the switch module includes: first switch tube and second switch；Described first Controlling signal includes: the first driving signal and the second driving signal；

Wherein, the first conduction terminal access reference voltage of the first switch tube, the first of the second switch Conduction terminal accesses the common-mode voltage, the second conduction terminal of the first switch tube and the second conduction terminal of the second switch It is connected to the energy-storage module altogether；

The control terminal of the first switch tube accesses first driving signal, and the first switch tube is according to described first The level state of driving signal is connected or shutdown；

The control terminal of the second switch accesses second driving signal, and the second switch is according to described second The level state of driving signal is connected or shutdown.

In one of them embodiment, the electricity of the level state of first driving signal and second driving signal Level state meets the following conditions:

In above formula, the logic and operation of the "+" representation signal, the N1 is the level state of the first driving signal, The N2 is the level state of the second driving signal, and the Y=0 or 1 is describedFor the inverse value of the Y, the φ_1dFor First level signal, the φ_2dFor second electrical level signal, and first level signal and the phase of second electrical level signal are handed over It is wrong.

In one of them embodiment, the energy-storage module includes: first capacitor；

Wherein, the first termination switch module of the first capacitor, the second termination tune of the first capacitor Molding block.

In one of them embodiment, the modulation module includes:

It is connect with the energy-storage module, is configured as being connected or being turned off according to switching signal, shifts and adjust The switch unit of the charge of the energy-storage module output；And

Be connected between the switch unit and the quantizer, be configured as to the energy-storage module export charge into It is capable to integrate and compare amplification, to export the zero location excessively of the integral voltage.

In one of them embodiment, the switching signal includes first switch signal and second switch signal；

The switch unit includes: variable resistance, third switching tube and the 4th switching tube；

Wherein, the first conduction terminal access common-mode voltage of the third switching tube, the second of the third switching tube Conduction terminal and the first end of the variable resistance are connected to the energy-storage module, the second termination the described 4th of the variable resistance altogether First conduction terminal of switching tube, the second conducting termination of the 4th switching tube is described to cross zero location；

The control terminal of the third switching tube accesses the first switch signal, and the third switching tube is according to described first The level state of switching signal is connected or shutdown；

The control terminal of 4th switching tube accesses the second switch signal, and the 4th switching tube is according to described second The level state of switching signal is connected or shutdown.

In one of them embodiment, the phase cross-over of the first switch signal and the second switch signal.

In one of them embodiment, the quantizer includes: first voltage input terminal, second voltage input terminal, control End processed and digital signal output end；

Wherein, the first voltage input termination of the quantizer is described crosses zero location, and the second voltage of the quantizer is defeated Enter to terminate the common-mode voltage, the control terminal of the quantizer accesses the second control signal, and the quantizer is according to The level state of second control signal works or stops；

In quantizer work, the quantizer carries out calculus of differences to the integral voltage and the common-mode voltage To generate the digitally encoded signal, the digital signal output end of the quantizer exports the digitally encoded signal；

The phase of the second control signal is identical with the phase of the second switch signal.

In one of them embodiment, it is described cross zero location include: comparator, integrating capacitor, the 5th switching tube and Constant-current source；

Wherein, the first input end of the comparator accesses the common-mode voltage, the second input terminal of the comparator and The first end of the integrating capacitor is connected to the switch unit altogether, the second end of the integrating capacitor, the 5th switching tube The first end of first conduction terminal, the output end of the comparator and the constant-current source is connected to the quantizer, the constant current altogether The second end in source is grounded；

Second the first DC power supply of termination of the 5th switching tube；

The control terminal of 5th switching tube accesses third driving signal, and the 5th switching tube drives according to the third The level state of signal is connected or shutdown.

The second aspect of the embodiment of the present invention provides a kind of electric resistance sensor reading circuit, comprising:

It is configured the current source of output driving current；

It is connect with the current source, is configured as changing the electric resistance sensor of itself resistance value according to external disturbance amount；

It is connect with the electric resistance sensor, is configured as acquiring the variable quantity of the running current of the electric resistance sensor, and The variable quantity of the running current is converted to the electric pressure converter of reference voltage；And

Voltage-to-digit converter as described above, the voltage-to-digit converter are connect with the electric pressure converter, the electricity Pressure digital quantizer accesses the reference voltage and is converted into digitally encoded signal.

Above-mentioned voltage-to-digit converter carries out charge or discharge by energy-storage module, in voltage-to-digit converter to electricity Pressure carries out in analog-digital conversion process, and the electric energy exported by energy-storage module can provide work energy, and energy to modulation module Enough as the biasing electric energy of modulation module, the multiplexing of electric energy is realized, reduces switching power loss, the voltage digital in the present embodiment Converter can routinely realize the function of analog-to-digital conversion, steadily to export digitally encoded signal, improve the voltage The practical value of digital quantizer；The modulation module in the embodiment of the present invention uses Δ ∑ modulator approach for charge simultaneously, and When filtered out noise component(s) in reference voltage, avoid distorted signals problem in voltage signal conversion process, the present invention is implemented Quantizer in example can obtain more true voltage value, and digitally encoded signal can become according to the variation of reference voltage Change, the precision of analog-to-digital conversion is higher, and response speed faster, can obtain higher resolution ratio；To in the embodiment of the present invention Voltage-to-digit converter can greatly improve voltage sample precision, bring more preferably usage experience to user；Avoid tradition The problem that the power consumption of voltage-to-digit converter is excessive in technology and the precision and resolution ratio of digital signal are lower.

Detailed description of the invention

It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these Attached drawing obtains other attached drawings.

Fig. 1 is the structural schematic diagram for the voltage-to-digit converter that one embodiment of the invention provides；

Fig. 2 is the structural schematic diagram for the modulation module that one embodiment of the invention provides；

Fig. 3 is the particular circuit configurations for the voltage-to-digit converter that one embodiment of the invention provides；

The comparison of voltage-to-digit converter is referring to circuit structure in Fig. 3 that Fig. 4 provides for one embodiment of the invention；

Fig. 5 is the waveform graph for each control signal that one embodiment of the invention provides；

The Analysis of Equivalent Circuit figure of voltage-to-digit converter in Fig. 3 that Fig. 6 provides for one embodiment of the invention；

Fig. 7 is the waveform graph of each control signal and each node voltage that one embodiment of the invention provides；

A kind of equivalent circuit structure figure of voltage-to-digit converter in Fig. 6 that Fig. 8 provides for one embodiment of the invention；

Another equivalent circuit structure figure of voltage-to-digit converter in Fig. 6 that Fig. 9 provides for one embodiment of the invention；

Figure 10 is the waveform variation diagram of the integral voltage for the integrator output that one embodiment of the invention provides；

Figure 11 is the structural schematic diagram for the electric resistance sensor reading circuit that one embodiment of the invention provides.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.

Referring to Fig. 1, the structural schematic diagram of voltage-to-digit converter 10 provided in an embodiment of the present invention, passes through the voltage number Word converter 10 can be realized the accurate analog-digital conversion function of voltage, for ease of description, illustrate only related to the present embodiment Part, details are as follows:

As shown in Figure 1, voltage-to-digit converter 10 include: switch module 101, energy-storage module 102, modulation module 103 with And quantizer 104.

Wherein, switch module 101 is accessed or is turned off reference voltage Vref and/or common mode according to first control signal Voltage Vcom.

Optionally, the switch module 101 is connected or turns off according to the level state of first control signal C1；It is exemplary , when the first control signal C1 is the first level state, switch module 101 is connected, when first control signal C1 is the When two level states, switch module 101 is turned off, and wherein first control signal includes connecting and disconnecting of the circuit control information, passes through the first control The level state of signal processed can change conducting or the off state of switch module 101 in time；Switch module 101 can be realized Voltage transmission function, therefore the control response speed with higher of switch module 101 in the present embodiment.

It should be noted that first level state is high level state or low level state, and described first The phase cross-over of level state and second electrical level state；Illustratively, the first level state is high level state, then second electrical level State is low level state.

In the present embodiment, when switch module 101 accesses reference voltage Vref and/or common-mode voltage Vcom；Reference voltage Vref and common-mode voltage Vcom includes corresponding information of voltage, when information of voltage changes, the voltage-to-digit converter 10 accessed electric energy can also occur to change accordingly；It can be provided to voltage-to-digit converter 10 by reference to voltage Vref original Driving electric energy, voltage-to-digit converter 10 can be made to be in stable work by the reference voltage Vref and common-mode voltage Vcom State；The electric energy input state of the voltage-to-digit converter 10 has the circuit structure of good controllability and flexibility, The voltage-to-digit converter 10 can carry out analog-to-digital conversion, the voltage-to-digit converter 10 according to the operational order of technical staff With higher practical value.

Energy-storage module 102 is connect with the switch module 101, is configured as according to the reference voltage Vref and described total Mode voltage Vcom carries out charge or discharge.

In the present embodiment, the energy-storage module 102 has the function of power storage, and there are phases for energy-storage module 102 The quantity of electric charge answered；When switch module 101 is by different voltage output to energy-storage modules 102, then energy-storage module 102 can be according to opening It closes the voltage that module 101 exports and carries out charge or discharge, to realize the conversion function of electric energy；And then the voltage in the present embodiment Digital quantizer 10 can change the amplitude of electric energy, can more accurately be obtained according to the power change amount in energy-storage module 102 To the undulate quantity of reference voltage, more accurate analog-digital conversion function can be realized by the quantity of electric charge on energy-storage module 102, accelerated The analog-to-digital conversion efficiency of voltage-to-digit converter 10.

Modulation module 103 is connect with the energy-storage module 102, is configured as the charge exported to the energy-storage module 102 After carrying out Δ ∑ modulation feedback, integral voltage is exported.

Wherein, energy-storage module 102 can be charged or be put according to the on state or off state of switch module 101 Electricity, the charge that the energy-storage module 102 exports can provide power supply electric energy for modulation module 103, so that the modulation module 103 In stable working condition；And the charge that energy-storage module 102 exports can provide biasing electric energy for modulation module 103, lead to Δ ∑ modulation feedback is crossed to change the charge accumulated in modulation module 103, is in switch module 101 according to first control signal Difference is connected or in the turn-off time, the integral voltage exported by modulation module 103 is not identical；Pass through the modulation module 103 charges that can be exported to energy-storage module 102 are removed noise processed, and reduce undulate quantity in charge；The modulation Module 103 can amplitude in automatic adjusument integral voltage so that the integral voltage can follow the switching molding in real time 101 input voltage of block changes, and is conducive to ensure that voltage-to-digit converter 10 turns voltage analog in the present embodiment Precision and transfer efficiency are changed, the voltage-to-digit converter 10 has more high dynamic modulating performance.

Quantizer 104 is connect with the modulation module 103, is configured as according to second control signal to the integral voltage It carries out quantification treatment and obtains digitally encoded signal.

Wherein, the modulation module 105 exports integral voltage to quantizer 104, can obtain phase by quantizer 104 Information of voltage is closed, and is classified according to the amplitude of integral voltage, which represents the charge amplitude in each section；It should Analog quantity can be converted to figure pattern by quantizer 104, and the digitally encoded signal belongs to discrete digital signal；Wherein Two control signals can change the working condition of quantizer 104, so that quantizer 104 can continue, steadily output number is compiled Code signal；Illustratively, it is converted by the digital signal that the level state of second control signal can change quantizer 104 in real time When function, only quantizer 104 are in normal, stable working condition, voltage-to-digit converter 10 can output phase answer Digitally encoded signal；To which the present embodiment can ensure that the number of voltage-to-digit converter 10 converts function by quantizer 104 The stability and reliability of energy, voltage-to-digit converter 10 can export in real time corresponding number according to the variable quantity of voltage analog Signal, practical value are high；Exemplary, quantizer 104 is connect with external mobile terminal, the quantizer 104 can directly by Digitally encoded signal is exported to external mobile terminal, can accurately be identified by the mobile terminal and be parsed number volume Code signal brings more preferably usage experience to user by the specific amplitude of external mobile terminal real-time display voltage；This reality The voltage-to-digit converter 10 applied in example can be suitable for each different technical field, and the scope of application is extremely wide.

In voltage-to-digit converter 10 shown in fig. 1, information of voltage is had access to by switch module 101, and lead to The level state for crossing first control signal can change the working condition of switch module 101, so that voltage-to-digit converter 10 can The analog-to-digital conversion that voltage is carried out according to the actual demand of technical staff, improves the controllability of voltage-to-digit converter 10；It is logical The transmission form of the electrically operated changeable electric energy of charge and discharge of energy-storage module 102 is crossed, the charge exported by energy-storage module 102 can be Modulation module 103 provides the function of electric energy multiplexing, has ensured utilization rate of electrical and voltage digital turn that energy-storage module 102 exports The analog-to-digital conversion efficiency of parallel operation 10, the voltage-to-digit converter 10 in the present embodiment are mentioned without setting exclusively for modulation module 103 For bias current, the power consumption of the voltage-to-digit converter 10 is significantly reduced, the sky of voltage-to-digit converter 10 is saved Between volume；And the charge amplitude of the output of energy-storage module 102 can be changed by modulating feedback method by Δ ∑, be realized for electric energy Automatic adjusument, integral voltage can change according to the variation of reference voltage Vref, and voltage-to-digit converter 10 has Higher signal-to-noise ratio improves the accuracy and resolution ratio of the digitally encoded signal of the output of quantizer 104, passes through the voltage digital Converter 10 can realize higher analog-to-digital conversion performance；When the voltage signal for exporting figure pattern by voltage-to-digit converter 10 When, external circuit can be realized intellectual analysis and processing for the voltage signal, bring to user good using body It tests, and then the voltage-to-digit converter 10 has the extremely wide scope of application；Efficiently solve voltage analog in traditional technology Amount during carrying out analog-to-digital conversion there are biggish power consumption, voltage analog during modulation conversion by noise jamming, The digital signal resolution ratio that traditional voltage-to-digit converter is converted to is lower, and the conversion rate of signal is slower, it is difficult to universal Applicable problem.

As optional embodiment, Fig. 2 shows the structural representations of modulation module 103 provided in this embodiment, compare Voltage-to-digit converter 10 in Fig. 1, modulation module 103 specifically includes in Fig. 2: switch unit 1031 and crossing zero location 1032。

Wherein, switch unit 1031 is connect with the energy-storage module 102, be configured as being carried out according to switching signal conducting or The charge that the energy-storage module 102 exports is shifted and is adjusted in person's shutdown.

Optionally, the switch unit 1031 is connected or turns off according to the level state of switching signal；Illustratively, if Switching signal is the first level state, then switch unit 1031 is connected；Switching signal is second electrical level state, then switch unit 1031 shutdowns；Therefore the switch unit 1031 in the present embodiment has more flexible control mode.

In embodiments of the present invention, the signal modulation function of modulation module 103 can be changed in time by switching signal, with So that the voltage-to-digit converter 10 is exported corresponding digitally encoded signal according to the actual demand of technical staff, ensures The practical value of voltage-to-digit converter 10；It is being passed by the charge that switch unit 1031 can ensure that energy-storage module 102 exports Integrity and stability during defeated, and switch unit 1031 can change the amplitude and transmission rate of charge, so that electric The quantity of electric charge in pressure digital quantizer 10 is in safe working condition always, and can according to the charge that switch unit 1031 exports Realize normal mode conversion function, the digitally encoded signal that the voltage-to-digit converter 10 exports can be according to the voltage of input Adaptively changing occurs for value.

It crosses zero location 1032 to be connected between the switch unit 1031 and the quantizer 104, be configured as to described The charge that energy-storage module 102 exports is integrated and is compared amplification, to export the integral voltage.

When switch unit 1031 by charge export to cross zero location 1032 when, by charge carry out integration operation can disappear Except the error in charge, extraneous interference volume is avoided to interfere the analog-digital conversion process of charge, passes through the charge after integral The situation of change that the voltage analog of the input of voltage-to-digit converter 10 can accurately be mapped out, carries out integral behaviour for charge Work can ensure voltage digital conversion accuracy, so that the digitally encoded signal has higher steady-state value；Simultaneously for charge Amplitude be compared and enlarged after, modulation module 103 can be improved for the modulation accuracy of charge, crossing zero location 1032 can be according to Operational order realizes accurate function more accurately for charge；Therefore in the present embodiment cross zero location 1032 by charge into After the adaptive dynamic Δ ∑ modulation feedback control of row, the information of voltage for crossing the output of zero location 1032 can be with voltage-to-digit converter The voltage of 10 inputs can keep synchronous variation, the digital switch process for analog voltage signal be optimized, so that the voltage Digital quantizer 10 can export accurate digital signal according to the actual demand of technical staff, improve voltage-to-digit converter 10 scope of application, the usage experience of user is more preferably.

As an alternative embodiment, Fig. 3 shows the specific of voltage-to-digit converter 10 provided in this embodiment Circuit structure, as shown in figure 3, the switch module 101 includes: first switch tube M1 and second switch M2；First control Signal processed includes: the first driving signal and the second driving signal；

Wherein, the first conduction terminal of the first switch tube M1 accesses the reference voltage Vref, the second switch The first conduction terminal of M2 accesses the common-mode voltage Vcom, the second conduction terminal of the first switch tube M1 and the second switch The second conduction terminal of pipe M2 is connected to the energy-storage module 102 altogether, when first switch tube M1 and second switch M2 are respectively at not Same conducting or off state, then switch module 101 is by the voltage transmission of different amplitudes to energy-storage module 102, to realize storage It can the different power storage functions of module 102.

The control terminal of the first switch tube M1 accesses first driving signal, and the first switch tube M1 is according to The level state of first driving signal is connected or shutdown；Illustratively, when the first driving signal is the first level state, then the It is connected between the first conduction terminal and the second conduction terminal of one switching tube M1；When the first driving signal is second electrical level state, then It is turned off between the first conduction terminal and the second conduction terminal of first switch tube M1.

The control terminal of the second switch M2 accesses second driving signal, and the second switch M2 is according to The level state of second driving signal is connected or shutdown；Illustratively, when the second driving signal is the first level state, then the It is connected between the first conduction terminal and the second conduction terminal of two switching tube M2；When the second driving signal is second electrical level state, then It is turned off between the first conduction terminal and the second conduction terminal of second switch M2.

Illustratively, first switch tube M1 is that perhaps triode second switch M2 is metal-oxide-semiconductor or triode to metal-oxide-semiconductor； For example, first switch tube M1 and second switch M2 are metal-oxide-semiconductor, when the control of the grid access varying level state of metal-oxide-semiconductor When signal, is then connected or turns off between the drain electrode and source electrode of metal-oxide-semiconductor, to realize different voltage transmission effects.

In Fig. 3 in the circuit structure of switch module 101, by combining between first switch tube M1 and second switch M2 Conducting or off state, the switch module 101 can export the voltage of different amplitudes, storage can be realized by the voltage The charge or discharge operation of energy module 102；Therefore the present embodiment utilizes both first switch tube M1 and second switch M2 Between conducting or shutdown effect can be realized the charge and discharge control performance of energy-storage module 102, the switch module 101 has Higher control response speed can make energy-storage module 102 be in access different in conjunction with first switch tube M1 and second switch M2 Voltage, improve the controllability of switch module 101；And then the voltage-to-digit converter 10 can be needed according to the application of circuit The digital conversion function of realistic existing voltage analog, flexibility and stability are higher.

As an alternative embodiment, the level state of first driving signal and second driving signal Level state meets the following conditions:

In above formula (1) and above formula (2), the logic or operation of the "+" representation signal, the N1 are the first driving signal Level state, the N2 is the level state of the second driving signal, and the Y=0 or 1 is describedFor the opposite of the Y Value, the φ_1dFor the first level signal, the φ_2dFor second electrical level signal, and first level signal and the second electricity The phase cross-over of ordinary mail number.

According to the level state of the first driving signal and both the second driving signals that above formula (1) and above formula (2) generate There are interrelated, then the on off operating mode of both first switch tube M1 and second switch M2 is also interrelated；For example it sets Determining first switch tube M1 and second switch M2 is all high voltage drive, then only when the control that the control terminal of switching tube accesses When signal is high level state, the first conduction terminal and the second conduction terminal of switching tube are just connected；If the first level signal is high electricity Level state, second electrical level signal be low level state, Y=1,The first driving signal is high level state at this time, and second drives Dynamic signal is low level state, first switch tube M1 conducting, second switch M2 shutdown；Therefore the present embodiment passes through between signal Logical operation can be obtained each switching tube control signal level state, to ensure each switching tube in switch module 101 All in the state of a control of safety and stability, the conducting or shutdown of both first switch tube M1 and second switch M2 have more Add flexible control mode, response speed faster, may conform to the need of voltage digital conversion by the voltage that switch module 101 exports It asks, has ensured D conversion accuracy of the voltage-to-digit converter 10 for voltage analog, the voltage digital in the present embodiment Converter 10 has higher control performance.

As an alternative embodiment, the energy-storage module 102 includes: first capacitor C1；Wherein, first electricity Hold the first termination switch module 101 of C1, the second termination modulation module 103 of the first capacitor C1.

Wherein, first capacitor C1 has the function of energy storage, when switch module 101 has different conducting phase or shutdown Stage, first capacitor C1 realize charging operations or discharge operation, the first electricity according to reference voltage Vref and common-mode voltage Vcom Hold storage and release that C1 can be realized charge, in the process, first capacitor C1 carries out charge conversion by charge and discharge form, There are one-to-one relationships for the charge variation amount of voltage and first capacitor C1 that voltage-to-digit converter 10 accesses, then basis The charge of first capacitor C1 output can accurately obtain the specific amplitude of reference voltage Vref；Therefore the energy storage in the present embodiment Module 102 has more simplified circuit structure, and precision of the charge in transmission process can be changed using first capacitor C1, avoid There is biggish loss in conversion process in voltage；The energy-storage module 102 can be to reference voltage Vref and common-mode voltage Vcom carries out voltage conversion function, improves the analog-to-digital conversion efficiency of the voltage-to-digit converter 10, simplifies voltage digital The conversion accuracy of the internal circuit configuration of converter 10, digital signal is higher.

As an alternative embodiment, the switching signal includes first switch signal and second switch referring to Fig. 3 Signal；Wherein first switch signal and second switch signal separately include corresponding connecting and disconnecting of the circuit control information, and the present embodiment is logical Cross first switch signal and second switch signal makes different circuits be in corresponding on off operating mode respectively, is conducive to described in raising The control precision and accuracy rate of modulation module 103.

The switch unit 1031 includes: variable resistance Rs, third switching tube M3 and the 4th switching tube M4；Wherein, institute The first conduction terminal for stating third switching tube M3 accesses the common-mode voltage Vcom, the second conduction terminal of the third switching tube M3 and The first end of the variable resistance Rs is connected to the energy-storage module 102, the second termination the described 4th of the variable resistance Rs altogether The first conduction terminal of switching tube M4, the second conducting termination of the 4th switching tube M4 is described to cross zero location 1032.

When the energy-storage module 102 exports charge to switch unit 1031, since the resistance value of variable resistance Rs itself can The corresponding variation of generation, and the variable resistance Rs can play the role of current limliting and consumption electric energy, therefore passing through can power transformation Resistance Rs can change the quantity of electric charge transmitted in voltage-to-digit converter 10 in time, so that crossing zero location 1032 can be received entirely Specified charge, and can be that zero location 1032 provides bias current/voltage by the electric energy that switch unit 1031 exports, The voltage digital conversion stability and safety of digital quantizer 10 are ensured, the voltage-to-digit converter 10 in the present embodiment has Have and is more widely applied range.

The control terminal of the third switching tube M3 accesses the first switch signal, and the third switching tube M3 is according to The level state of first switch signal is connected or shutdown；Illustratively, when first switch signal is the first level state, the Three switching tube M3 conducting, when first switch signal is second electrical level state, third switching tube M3 shutdown；The 4th switching tube M4 Control terminal access the second switch signal, the 4th switching tube M4 is led according to the level state of the second switch signal Logical or shutdown；Illustratively, when second switch signal is the first level state, the 4th switching tube M4 conducting, second switch letter Number be second electrical level state when, the 4th switching tube M4 shutdown；To the third switching tube M3 and the 4th switching tube in the present embodiment M4 has more flexible on-off control mode.

Optionally, third switching tube M3 is that perhaps the 4th switching tube M4 of triode is metal-oxide-semiconductor or triode, sheet to metal-oxide-semiconductor Switch unit 1031 in embodiment has more compatible circuit structure.

Optionally, the phase cross-over of the first switch signal and the second switch signal；Third switching tube M3 and Four switching tube M4 can be respectively at different conducting or off state, and switch unit 1031 can be according to the practical need of technical staff Derivation is logical or shutdown, controllability are extremely strong；And the quantity of electric charge can be changed by variable resistance Rs in time, so that reference voltage Vref and common-mode voltage Vcom has higher adjustability, and voltage-to-digit converter 10 can adjust the quantity of electric charge in real time It is whole, avoid amplitude of the working voltage beyond safety in voltage-to-digit converter 10；The charge exported by switch unit 1031 10 input voltage situation of change of voltage-to-digit converter can be obtained more accurately, and voltage-to-digit converter 10 is single according to switch The charge of 1031 output of member realizes more accurate voltage digital conversion function, and the digitally encoded signal has higher resolution Rate；Therefore the switch unit 1031 in the present embodiment has flexible circuit structure, improves charge in switch unit 1031 The stability and safety of transmission, voltage-to-digit converter 10 are able to maintain stable working condition, the voltage digital conversion Device 10 has the wider array of scope of application.

As an alternative embodiment, 104 devices of the quantization include: first voltage input terminal, second referring to Fig. 3 Voltage input end, control terminal and digital signal output end；

Wherein, the first voltage input termination of the quantizer 104 is described crosses zero location 1032, by crossing zero location 1032 Integral voltage can be exported to quantizer 104；The second voltage input of the quantizer 104 terminates the common-mode voltage Vcom, the control terminal of the quantizer 104 access the second control signal C2, and the quantizer 104 is according to second control The level state of signal C2 processed works or stops；Illustratively, when second control signal C2 be the first level state, then quantify Device 104 is in running order, and when second control signal C2 is second electrical level state, then quantizer 104 is in halted state；Therefore The present embodiment can change the voltage digital conversion function of quantizer 104 by second control signal C2 in time, improve voltage number The voltage digital transfer efficiency and its controllability of word converter 103.

In the quantizer 104 work, it is poor that the quantizer 104 carries out the integral voltage and the common-mode voltage Partite transport is calculated to generate the digitally encoded signal, and the digital signal output end of the quantizer exports the digitally encoded signal； When the quantizer 104 stops, quantizer 104 cannot achieve the digital conversion function for voltage, and voltage digital turns at this time Parallel operation 10 can not export digitally encoded signal.

The phase of the second control signal C2 is identical with the phase of the second switch signal.

In the present embodiment, the voltage digital conversion function of quantizer 104 and the on off operating mode of switch unit 1031 have Relevance, after the quantity of electric charge is adjusted in switch unit 1031, crossing the integral voltage that zero location 1032 exports can also occur It is corresponding to change, and the situation of change of integral voltage can be consistent with the situation of change of reference voltage Vref completely, amount Corresponding voltage change information can be obtained by changing device 104, and carry out analog-to-digital conversion according to the voltage change information；Wherein common mode electricity Pressure Vcom is capable of providing voltage reference information, can be accumulated according to the amplitude difference between integral voltage and common-mode voltage Vcom Integral voltage is divided into different voltage magnitude areas after carrying out calculus of differences for the amplitude difference by the fluctuation situation of component voltage Between, the corresponding specific numerical value of the integral voltage in each section, to export corresponding digitally encoded signal；Therefore this implementation The quantity of electric charge can be divided into different discrete values according to the actual needs of technical staff by the quantizer 104 in example in real time, with Realize the voltage digital conversion function of voltage-to-digit converter 104；To which the voltage-to-digit converter 10 in the present embodiment has Preferable total tune control performance, reduces the analog-to-digital conversion step in the present embodiment, the generation cost of digitally encoded signal It is lower.

As an alternative embodiment, the zero location 1032 of crossing includes: comparator Cmp, integral electricity referring to Fig. 3 Hold Cf, the 5th switching tube M5 and constant-current source If.

Wherein, the first input end of the comparator Cmp accesses the common-mode voltage Vcom, and the of the comparator Cmp The first end of two input terminals and the integrating capacitor Cf are connected to the switch unit 1031 altogether, and the second of the integrating capacitor Cf End, the first conduction terminal of the 5th switching tube M5, the first end of the output end of the comparator Cmp and the constant-current source If It is connected to the quantizer 104 altogether, the second end of the constant-current source If is grounded GND；Wherein, constant-current source If can export stable straight Galvanic electricity stream is capable of the voltage of automatic adjusument integrating capacitor Cf output by constant-current source If, so that crossing zero location 1032 can Stable, safety feedback, adjustment effect are realized for charge.

It should be noted that the first input end of the comparator Cmp in the present embodiment is that normal phase input end or reverse phase are defeated Enter end, does not limit this；If the first input end of comparator Cmp is normal phase input end, the second input terminal of comparator Cmp For inverting input terminal.

Second the first DC power supply VCC1 of termination of the 5th switching tube M5；The control of the 5th switching tube M5 terminates Enter third driving signal, the 5th switching tube M5 is connected or turns off according to the level state of the third driving signal；Show Example property, third driving signal is the first level state, then five switching tube M5 are connected, and third driving signal is second electrical level shape State, then five switching tube M5 are turned off；Therefore the 5th switching tube M5 in the present embodiment has more flexible control mode.

Optionally, the first DC power supply VCC1 is+3V~+5V DC power supply, passes through the first DC power supply VCC1 energy It is enough to export direct current energy to integrating capacitor Cf, it can ensure that zero location 1032 realized stable electric energy by the direct current energy Integral process, modulation module 103 realize electric energy adaptive feedback modulation function.

In crossing in the particular circuit configurations of zero location 1032 shown in Fig. 3, using the electric energy integral action of integrating capacitor Cf, When switch unit 1031 by the charge after adjusting export to cross zero location 1032 when, the charge of the first input end of comparator Cmp And second input terminal charge between there are charge differences, comparator Cmp amplifies rear output voltage for the charge difference, with reality Existing electric energy number handoff functionality；And for integrating capacitor Cf during accessing charge, the both end voltage of integrating capacitor Cf cannot Mutation has integral action for the voltage that comparator Cmp is exported by integrating capacitor Cf, can be slow by the integral action Ground adjusts the voltage magnitude of comparator Cmp output, and there are errors for the voltage for avoiding comparator Cmp from exporting；Compare in the present embodiment The voltage of the output end of device Cmp and the amplitude of reference voltage Vref be able to maintain it is completely the same, cross zero location 1032 can carry out essence True electric charge transfer has ensured that voltage-to-digit converter 10, can by integrating capacitor Cf for the D conversion accuracy of voltage Automatic adjusument is carried out for the error in charge conversion process, improves the anti-aliasing performance and resolution of modulation module 103 Rate；The equivalent transfer of charge is realized to cross zero location 1032 using comparator Cmp, integrating capacitor Cf and constant-current source If, Convert the charge to can directly quantum chemical method integral voltage, with complete for charge Δ ∑ modulate feedback, voltage digital turn Parallel operation 10 carries out more fast, accurately conversion for charge and modulates, and improves the signal-to-noise ratio in voltage digital conversion process, mistake Zero location 1032 has higher adjustability for the integral of charge and amplifying operation, can drive electricity by the integral voltage Pressure digital quantizer 10 can accurately realize analog-digital conversion function, the power consumption of digital quantizer 10 be reduced, so that the number Word converter 10 has the wider array of scope of application, has ensured the compatibility and practicability of digital quantizer 10.

It, below will be by a series of in order to better illustrate the working principle of voltage-to-digit converter 10 in above-described embodiment Comparative experiments carry out account for voltage digital quantizer 10 voltage modulus transfer principle and voltage-to-digit converter 10 realized The excellent properties of voltage digital conversion, specific as follows:

In order to better illustrate the working performance of the voltage-to-digit converter 10, Fig. 4 shows a comparative experiments ginseng According to circuit, wherein voltage-to-digit converter 40 in Fig. 4 and the voltage-to-digit converter 10 in Fig. 3, the main area of the two Be not: the zero location 4032 of crossing in Fig. 4 uses trsanscondutance amplifier OTA instead of the comparator Cmp in Fig. 3, wherein described The both end voltage that trsanscondutance amplifier OTA can be inputted carries out calculus of differences to be converted to output electric current, and then the voltage Digital quantizer 40 generates discrete digitally encoded signal according to the electric current；Voltage-to-digit converter 10 in so Fig. 3 with The difference of both voltage-to-digit converters 40 in Fig. 4 can be summarized as: the voltage-to-digit converter 10 in Fig. 3 utilizes comparator Cmp+ integrating capacitor Cf realizes that charge is converted, and the voltage-to-digit converter 40 in Fig. 4 integrates electricity using trsanscondutance amplifier OTA+ Hold CS2 to realize that charge is converted.

It should be noted that comparison of the voltage-to-digit converter 40 as just voltage-to-digit converter 10 in Fig. 3 in Fig. 4 Referring to amount, it is not meant as constituting the traditional technology of the application.

It is specific as follows below by the charge conversion process of voltage-to-digit converter 40 in analysis chart 4:

When the quantity of electric charge having on capacitor CS1 depends on the conducting or shutdown of both switching tube MS1 and switching tube MS2 Between；Wherein the level state of the control signal of the level state and switching tube MS2 of the control signal of the switching tube MS1 can be distinguished Referring to above formula (1) and above formula (2)；Illustratively, Fig. 5 shows the wavy curve of each signal, wherein in Fig. 5, each word The physical meaning that mother represents are as follows:

φ_1d、φ_2dWith in above formula (1), above formula (2) the first level signal and second electrical level signal it is corresponding, φ₁Represent One switching signal, φ₂Represent second switch signal, φ_preRepresent third driving signal, φ_sRepresent the control signal of constant-current source, V₀ Represent integral voltage, V_zRepresent voltage (or the first input end of comparator Cmp of the first input end of trsanscondutance amplifier OTA Voltage)；It should be noted that the voltage-to-digit converter 10 in Fig. 3 is with the voltage-to-digit converter 40 in Fig. 4 with identical Control signal sequence, therefore the wavy curve of the signal in Fig. 5 can be suitable for Fig. 3 and Fig. 4 simultaneously.

Within each period of signal, the charge on capacitor CS1 can be all transferred on capacitor CS2, as Y=1 or 0, It is respectively as follows: (V according to the quantity of electric charge of above formula (1) and above formula (2), transfer_ref-V_cm)·CS₁Or (V_cm-V_ref)·CS₁, wherein The CS₁For the capacitance of capacitor CS1, trsanscondutance amplifier OTA is located in sampling Δ Σ modulation feedback control loop, and adds quantization Device 404 makes Y be updated to newly be worth in the failing edge of Ф 2, forces the average value Q of CS1_zIt is close to zero；Accordingly, there exist following equalities:

Q_z=(V_ref-V_cm)·CS₁·N(1)+(V_cm-V_ref)·CS₁N (0)=0 (3)；

Wherein N (1) and N (0) makes in single bit output stream Y 1 or 0 quantity, and the sum of single bit output stream Y respectively Measure N=N (1)+N (0).The average value of Y can have given below:

Since when seeking the node voltage of first input end of trsanscondutance amplifier OTA, the first of trsanscondutance amplifier OTA is defeated Entering end, there are virtual ground conditions with the second input terminal, in integration phase (φ₂For high level), integral voltage and trsanscondutance amplifier The node voltage of the first input end of OTA is all to be changed to stationary value with the form stable of index variation, with driving voltage number Word converter 40 can steadily, safely export digitally encoded signal.

For the working principle of above-mentioned digital quantizer 40, below in analysis chart 3 digital quantizer 10 working principle: it is first First by V_zIt is set to be greater than, then V₀It can be in short preset time stage φ_preIt is pulled to the first DC power supply VCC1, hereafter integral electricity Hold Cf to connect with constant-current source If to establish integrator, as shown in figure 5, the first input end of comparator Cmp and the second input terminal meeting There are virtual ground state (V_z=V_cm), and constant-current source If is closed, wherein the t in Fig. 5_dFor the voltage digital of digital quantizer 40 Conversion delaing time；Both trsanscondutance amplifier OTA in comparator Cmp and Fig. 4 in so Fig. 3 virtually connect there are identical Ground condition, and all charges on first capacitor C1 have been transferred completely into integrating capacitor Cf, therefore, the Y_aveIt should be with Fig. 4 Y in middle voltage-to-digit converter 40_aveCorresponding identical (i.e. Y_ave=1/2)；Therefore the digital quantizer 10 in Fig. 3 becomes charge Change amount is steadily converted to discrete digitally encoded signal.

In order to be better described in Fig. 3 in voltage-to-digit converter 10, the transfer of charge, situation of change, Fig. 6 show Fig. 3 The Analysis of Equivalent Circuit figure of middle voltage-to-digit converter 10, there is also 4 parasitic capacitances: C for the circuit diagram in Fig. 6_px、C_pw、 C_pz、C_po；Wherein parasitic capacitance is as caused by the mutual tolerance phenomenon between multiple capacitors, and parasitic capacitance can be in the work of circuit Storage section charge during work consumes some electric energy, and then causes in voltage-to-digit converter 10 charge in transfer process There are charges to calculate error；Therefore the voltage digital conversion process of voltage-to-digit converter 10 is analyzed in order to be more accurate, The transfer process of charge is analyzed below with reference to Fig. 6, specific as follows:

In Fig. 6, integrator is formed by comparator cmp, integrating capacitor Cf and constant-current source If, zero location 1032 is right crossing Charge carries out in Δ ∑ modulation feedback procedure, and constant-current source If here both is used to stablize output voltage (the integral electricity of integrator Pressure), and for changing the bias current in integrator, so that the situation of change for crossing the integral voltage that zero location 1032 exports can Situation of change completely with 1031 output charge amount of switch unit is consistent；Wherein Fig. 7 shows provided in this embodiment each The wavy curve of a control signal and each node voltage, in conjunction with comparison attached drawing 5 and attached drawing 7；The wherein V in Fig. 7_oFor node The voltage of O, V_zFor the voltage of node Z, V_wFor the voltage of node W, V_XFor the voltage of nodes X, the node O, node Z, node W And the specific location of nodes X is as shown in fig. 7, such as nodes X and node W are located at the both ends of variable resistance Rs；Referring to above-mentioned attached Electric charge transfer analytic process in Fig. 3 and attached drawing 4；In Fig. 6, the first input end of comparator Cmp and the second input terminal are virtual When ground connection, V_z=V_cm, V_X=V_cm+V_Rs(referring to attached drawing 7)；The charge exported from first capacitor C1 are as follows: (V_ref-V_cm+V_Rs)·C₁ Or (V_cm-V_ref+V_Rs)·C₁, wherein the C₁For the capacitance of first capacitor C1, in above formula (1) and above formula (2), the Y= 1 or 0；Therefore according to the charge and discharge balancing principle of first capacitor C1, following equation can be derived:

Q_z=(V_ref-V_cm+V_Rs)·C₁·N(1)+(V_cm-V_ref+V_Rs)·C₁N (0)=0 (5)

Then Y_aveChange according to the following formula:

Compare above formula (5) and above formula (6) plus Rs, exist:

In above formula (7), the Δ Y_aveFor Y_aveVariable quantity, then combine above formula (5), (6) and (7), Ke Yitong Y in overvoltage digital quantizer 10_aveObserve the variable quantity of variable resistance Rs；As 0 < Y_ave< 1 HeThen set electricity Pressure number convert after parameter into 1, V_refAnd V_cmIt must be adjusted with variable resistance Rs, if the resistance value of variable resistance Rs is regarded as For nominal resistance R_oWith variable resistance range delta R_sCombination of the two, then V_refAnd V_cmNominal resistance R must be used_oWith it is variable Resistance range Δ R_sIt optimizes, wherein R_s=R_o+ΔR_s。

In order to simplify the transfer analysis process for charge, Fig. 8 shows the equivalent circuit knot of Fig. 6 provided in this embodiment Structure wherein shows the transfer process of charge in first capacitor C1 in Fig. 8；As shown in figure 8, constant-current source If ideally (i.e. internal resistance is not present in constant-current source If), please refers to Fig. 8, all electric current I from constant-current source If will flow through variable resistance Rs, i.e. I =I_Rs, wherein I_RsFor the electric current of process variable resistance Rs, but since certain parts of electric current I will be by parasitic capacitance C_px、C_pw、 C_pzAnd C_poIt shunts, i.e. I ≠ I_Rs, it is assumed that I_RsBe close in the dt of tiny time interval it is constant, integrating capacitor Cf deposits charge In integral action, then there are following equalities:

DVx=dVw=dVz (8)

The law of conservation of charge of nodes X, node W and node Z navigation can be used following formula to indicate:

dVx·(C_s+C_px)+dV_w·C_pw+dV_z·C_pz+(dV_z-dV_o)·C_f=0 (9)

In conjunction with I and I_Rs, there are following formula:

Idt=dV_o·C_po+(dV_o-dV_z)·C_f (10)

I_RsDt=dV_X·(C₁+C_px) (11)

Therefore combination above formula (8)~above formula (11), can obtain I_RsWith the ratio of I:

It can be obtained by above formula (12), I_RsIt is unrelated with variable resistance Rs with the ratio of I, voltage-to-digit converter 10 for During charge is converted, is measured, C₁And C_fAnd these parasitic capacitances C_px、C_pw、C_pzAnd C_poCapacitance be all to maintain it is constant It is constant, therefore the nonlinear change of integral voltage will not be caused when variable resistance Rs variation, the modulation module 103 can Stable modulation is carried out, to charge to improve the precision of electric charge transfer.

Equivalent circuit structure in Fig. 8 is that in the ideal case, however in actual application, constant-current source If can exist Equivalent internal resistance R_c, equivalent internal resistance R_cIt will affect the current offset process of zero location 1032；Fig. 9 show the present embodiment provides Fig. 6 in voltage-to-digit converter 10 another equivalent circuit structure, compared to the equivalent circuit structure in Fig. 8, in Fig. 9 There is also equivalent internal resistance R by constant-current source If_c；In Fig. 9, the electric current I of constant-current source If output is remained unchanged within each period；However In actual permanent benefit source If, there are internal resistance R_c, this results in variable-current I [n]:

I [n]=I_C+I_R[n]=I_C+V_o[n]/R_C (13)

Wherein referring to Fig. 9, the equivalent resistance R_cIt is in parallel with constant-current source If, in above formula (13), I_CIt is to flow into ideal current The electric current in source, I_R[n] is to flow into internal resistance R_cElectric current, the electric current I [n] of this variation can make voltage drop change V_Rs[n]=I [n]·R_S, then this variable-current I [n] will make variable resistance R_SVoltage measurement during there are some errors, reduce The precision that electric charge transfer calculates.

As Δ ∑ modulation feedback as a result, output voltage (integral voltage) V of integrator_oIt should be about V_cmSymmetrically, and And and V_cmWith corresponding wavy curve, then I [n]=I+ Δ I and V_oIt is consistent, it is assumed that

Δ I [n]=(V_o[n]-V_cm)/R_c (15)

In conjunction with above formula (5), (14) and (15), following formula can be obtained:

In above formula (16), the N is the integer greater than 1；If internal resistance R_cIt is infinitely great, such as in ideal electric current In source, formula (16) are substituted into above formula (5), then this part in formula (16)Expression is by non-ideal electricity Reference noise is inputted caused by stream source.

FurthermoreIt can be considered as with the random process for uniformly having changed density function；Therefore input reference is made an uproar Sound error power can be calculated by following formula:

Wherein,It can be seen that the constant-current source by formula (17) Charge transfer process of the internal resistance Rs for integrator caused by error can ignore not anxious, the voltage digital in the present embodiment Converter 10 realizes high-precision Δ ∑ for charge and modulates feedback function.

Referring to Fig. 7, the integral voltage V of the integrator output_oIn φ₂Significant level state at the end of, Figure 10 is shown Integral voltage V provided in this embodiment_oDynamic change schematic diagram, referring to Fig.1 0, for constant-current source If, additional charge Δ V_o=It_dGround is discharged into, to generate overshoot voltage Δ V_oWith Δ V_ZRespectively on node O and node Z；In addition, because integral electricity Hold the error charge Q on integral node Z caused by the delay time of Cf_err,zdIt is unrelated with variable resistance Rs；It then can to above formula (5) It is modified as follow form:

Q_z,zd=(V_ref-V_cm+V_Rs)·C₁·N(1)+(V_cm-V_ref+V_Rs)·C₁·N(0)+N·Q_err,zd=0 (18)

According to above formula (18), integrator Charge Deviation error caused by delay time in voltage-to-digit converter 10 For Y_err,zd, therefore the Y_err,zdCan there is following equation to provide:

By above formula (19) it is found that Charge Deviation error Y in the voltage-to-digit converter 10_err,zdNot by can power transformation The interference for hindering Rs, after the integrator is integrated to charge and compared amplification output integral voltage, quantizer 104 can be to this Integral voltage carries out accurate digitlization conversion process, and eliminates the Charge Deviation error Y in integral voltage in real time_err,zd, reduce Caused detection error in charge transfer process.

Situations such as leading to Charge Deviation error in turn there are delay time with above-mentioned integrating capacitor Cf, is similar, reference Fig. 9, Can also there be corresponding voltage overshoot on node O and node Z, therefore meet following formula:

Q_err,zo=V_off·(C₁+C_pX+C_pw) (20)

In above formula (20), the V_offRepresent the bias voltage of the integrating capacitor Cf, Q_err,zdRepresent the integral electricity The biascharge for holding Cf, thus, the biascharge of integrating capacitor Cf is unrelated with the resistance value of variable resistance Rs；So node Z Charge Deviation error Y_ave,zoCan there is following formula to calculate:

In above formula (21), there is offset error in the charge that the charge delay time of node Z only results in integrator output, and And above formula (21) and above formula (19) are combined, the offset in voltage-to-digit converter 10 interior joint O and node Z in the present embodiment misses Poor charge is unrelated with the resistance value of variable resistance Rs, can't interfere in the voltage digital conversion process to quantizer 104.

Therefore according in above-mentioned comparative experiments, the working principle of the voltage-to-digit converter 10 in the embodiment of the present invention is led to Crossing comparator Cmp and integrating capacitor Cf can be realized adjust automatically and integrating function for charge, to prevent charge from passing Occurs deviation during defeated；When energy-storage module 102 transfers the charge to modulation module 103, by the modulation module 103 for electricity Lotus is adaptively shifted and is converted, and produces stable integral voltage after carrying out Δ ∑ modulation feedback for charge, and And the variable quantity of integral voltage and the variable quantity of charge remain exactly the same, the number conversion improved for voltage is accurate；It is logical The electric energy for crossing the output of energy-storage module 102 can provide biasing electric energy to modulation module 103, reduce the function of electric energy, the voltage The voltage digital transfer efficiency with higher of digital quantizer 10；To which the voltage-to-digit converter 10 in the present embodiment can be kept away Exempt from charge generated charge mushing error in transmission process, improves the stability of the Δ ∑ modulation feedback of voltage and reliable Property, the voltage-to-digit converter 10 can accurately divide into discrete digitally encoded signal according to the amplitude of input voltage, mention The precision and resolution ratio of voltage digital conversion in high voltage-to-digit converter 10, compatibility is higher and the scope of application is wider；Have Solving to effect voltage-to-digit converter in conventional solution, there are biggish total power consumptions, and there are larger mistakes for voltage digital conversion The problem of difference.

Figure 11 shows the modular structure of electric resistance sensor reading circuit 110 provided in this embodiment, the resistance sensing Device reading circuit 110 can acquire the resistance change of electric resistance sensor itself, and being converted to according to the resistance change of itself can The figure pattern of identification, and then technical staff directly can obtain the change in resistance situation of electric resistance sensor by digital quantity, improve For the acquisition precision and sampling accuracy of electric resistance sensor itself resistance value；As shown in figure 11, the electric resistance sensor is read Circuit 110 includes: current source 1101, electric resistance sensor 1102, electric pressure converter 1103 and voltage digital conversion as described above Device 10.

1101 output driving current of current source.

Wherein the driving current is capable of providing driving electric energy, is electric resistance sensor reading circuit 10 by the driving electric energy Measurement electric energy is provided；When the electric resistance sensor reading circuit 10 accesses the driving current, electric resistance sensor reading circuit 10 It is at stable working condition, has ensured the reliability and stability of the resistance value for electric resistance sensor, the resistance passes Sensor reading circuit 10 has the higher scope of application and practical value.

Electric resistance sensor 1102 is connect with the current source 1101, is configured as changing itself resistance according to external disturbance amount Value.

Optionally, the external disturbance amount includes: temperature, pressure and humidity etc., since electric resistance sensor is for the external world The variation of environmental parameter sensitivity with higher, therefore when external environment parameters change, electric resistance sensor itself resistance Value can also occur to change accordingly；Illustratively, when extraneous temperature increases, the resistance value of electric resistance sensor 1102 rises；When It is extraneous when the temperature drops, the resistance value of electric resistance sensor 1102 reduces；Therefore in the present embodiment electric resistance sensor itself resistance value There are one-to-one relationships with external disturbance amount for variable quantity.

In the present embodiment, electric resistance sensor 1102 can utilize the change of various non-electrical physical quantitys in sensing external environment Change, and the variation of various non-electrical physical quantitys is converted to the variation of electricity physical quantity, to realize for electric resistance sensor 1102 itself resistance value precise measurements；The electric resistance sensor 1102 can accurately examine extraneous various forms disturbance quantity It surveys；The variation feelings of various physical quantitys in external environment can be accurately obtained according to the variable quantity of electric resistance sensor 1102 itself resistance value Condition can monitor the situation of change of the various physical quantitys of external environment in real time by electric resistance sensor 1102 itself resistance value.

Electric pressure converter 1103 is connect with the electric resistance sensor 1102, is configured as acquiring the electric resistance sensor 1102 Running current variable quantity, and the variable quantity of the running current is converted into reference voltage.

Current source 1101 exports driving current to electric resistance sensor 1102, when itself resistance of the electric resistance sensor 1102 When value changes, the running current of electric resistance sensor 1102 can also change, according to the fortune of electric resistance sensor 1102 itself There are one-to-one relationships for the change in resistance amount of row current change quantity and electric resistance sensor 1102 itself；When electric resistance sensor 1102 When the running current of itself changes, electric pressure converter 1103 can acquire the variation of the running current of electric resistance sensor 1102 Amount, and the variable quantity of the running current is converted into reference voltage, in order to the resistance value essence to electric resistance sensor 1102 itself Really measurement；To which the electric pressure converter 1103 in the present embodiment can be realized the real-time conversion function of current-voltage, by reference to The amplitude of voltage can accurately obtain the size of itself resistance value of electric resistance sensor 1102, improve for electric resistance sensor 1102 certainly The sampling precision and current slew rates of the resistance of body, the electric resistance sensor reading circuit 10 have the higher scope of application and Generality.

It should be noted that the circuit structure in traditional technology can be used in fact in electric pressure converter 1103 in the present embodiment It is existing, herein without limitation to this；Illustratively, the electric pressure converter 103 includes: the electronic components such as comparator, resistance, when After comparator accesses the running current of electric resistance sensor 1102, compared using the electric current of comparator, enlarging function, the comparator Can export with the matched reference voltage of the magnitude of current, the comparator can realize electric energy accurate conversion function, described The voltage converting accuracy with higher of electric pressure converter 1103, can accurately obtain electric resistance sensor according to the reference voltage 1102 resistance value；Therefore the electric pressure converter 1103 has compatible circuit structure, and manufacturing cost is extremely low, significantly reduces The circuit manufacturing cost and application cost of electric pressure converter 1103, so that the electric resistance sensor reading circuit 110 can be applicable in In various external environments, to realize the accurate sampling for a variety of non-electrical physical quantitys.

The voltage-to-digit converter 10 is connect with the electric pressure converter 1103, and the voltage-to-digit converter 10 accesses The reference voltage is simultaneously converted into digitally encoded signal；When reference voltage is converted to digital quantity by voltage-to-digit converter 10, The specific amplitude of reference voltage can be accurately obtained according to the digital quantity；It can be for reference by voltage-to-digit converter 10 Voltage realizes accurate analog-digital conversion function, and the digital signal after digital processing can be identified and be divided by extraneous mobile terminal Analysis, and then obtain the amplitude of the reference voltage of electric resistance sensor 1102；Further, according to the reference of the electric resistance sensor 1102 Itself resistance value of electric resistance sensor 1102 is calculated in voltage, realize for electric resistance sensor 1102 itself resistance value it is high-precision Degree sampling is quickly converted function with voltage；The adaptation model with higher of electric resistance sensor reading circuit 1102 in the present embodiment It encloses.

In conjunction with the embodiment of above-mentioned Fig. 1 to Figure 10, can accurately be obtained in external environment by electric resistance sensor 1102 The situation of change of interference volume, the running current variable quantity that electric pressure converter 1103 acquires electric resistance sensor 1102 are joined accordingly Voltage is examined, reference voltage implementation pattern is converted by voltage-to-digit converter 10, technical staff can more intuitively obtain electricity Hinder the variable quantity of itself resistance value of sensor 1102；Since voltage-to-digit converter 10 has lower electric energy power consumption, and voltage Digital quantizer 10 has high revolving speed efficiency for reference voltage, and the digital signal being converted to has high resolution ratio And precision；So voltage-to-digit converter 10 obtains the signal of figure pattern after carrying out Δ Σ modulation for analog voltage amount, outside The various mobile terminals on boundary can recognize and handle digital signal, to obtain the resistance value of corresponding resistor sensor 1102, technical staff The physical parameter situation of change that extraneous various non electrical quantities can be monitored in real time by voltage-to-digit converter 10, brings good to user Good usage experience；Therefore when voltage-to-digit converter 10 is applied to electric resistance sensor reading circuit 110 by the present embodiment, pass through Accurate sampling of the electric resistance sensor reading circuit 110 using electric resistance sensor 1102 for physical quantitys various in external environment, leads to The voltage variety for crossing electric resistance sensor 1102 itself obtains the situation of change of various physical quantitys in external environment, and voltage digital turns Parallel operation 10 generates corresponding digital signal according to reference voltage, can be accurately obtained electric resistance sensor 1102 according to the digital signal The specific amplitude of itself resistance value；To which the electric resistance sensor reading circuit 110 in the present embodiment is for electric resistance sensor 1102 Voltage realizes analog-digital conversion function, carries out in voltage digital conversion process for analog quantity, signal-to-noise ratio with higher, institute Physical quantitys various in external environment can accurately be sampled by stating electric resistance sensor reading circuit 110, easy to operate, circuit knot Structure is simple, and then the electric resistance sensor reading circuit 110 can be suitable for each different industrial technical field, compatible pole By force；It is lower for the sampling precision of resistance to efficiently solve electric resistance sensor reading circuit in traditional technology, and for During analog quantity carries out analog-to-digital conversion, the precision and resolution ratio for the digital signal being converted to are lower, need biggish electricity Energy power consumption, can not accurately sample physical quantitys various in external environment by traditional electric resistance sensor reading circuit, Compatibility is lower, it is difficult to blanket problem.

Various embodiments are described to various devices, circuit, device, system and or method herein.It elaborates very much Specific details is to provide general construction, the function, system of the embodiment that the sum as described in the description is shown in the accompanying drawings The thorough understanding made and used.However it will be understood by those skilled in the art that embodiment can be in not such certain detail It is carried out in the case where section.In other examples, well known operation, component and element is described in detail, in order to avoid make in specification In embodiment indigestion.It will be understood by those skilled in the art that being unrestricted in the embodiment with shown in herein Property example, and therefore it can be appreciated that, can be in specific structure and function details disclosed herein representative and and different The range of definite limitation embodiment.

Throughout the specification to " various embodiments ", " in embodiments ", " embodiment " or " embodiment party The reference of formula " etc., which is meant, is included at least one embodiment about a particular feature, structure, or characteristic described in embodiment In.Therefore, phrase " in various embodiments ", " in some embodiments ", " in one embodiment " or " implementing In mode " etc. the appearance in appropriate place throughout the specification be not necessarily all referring to same embodiment.In addition, specific spy Sign, structure or characteristic can combine in any suitable manner in one or more embodiments.Implement accordingly, with respect to one The a particular feature, structure, or characteristic that mode shows or describes can entirely or partly with one or more of the other embodiment spy Sign, structure or characteristic are combined, without assuming that such combination is not illogical or non-functional limitation.Any side To with reference to (for example, add, subtract, top, lower part, upwards, downwards, the left side, the right, to the left, to the right, top, bottom ... On ... under, it is vertical, horizontal, clockwise and anticlockwise) purpose to be for identification to help reader to understand present disclosure, And limitation is not generated, especially with regard to the position of embodiment, orientation or use.

Although describing certain embodiments above with some the level of detail, those of skill in the art can be to institute Disclosed embodiment makes many changes without departing from the scope of the present disclosure.Connection is with reference to (for example, attachment, coupling, connection Deng) should be widely interpreted, and may include the intermediate member between the connection of element and relative motion between elements.Cause This, connection reference does not necessarily imply that two elements are directly connected to/couple and are in fixed relationship each other." such as " entire Use in specification should be widely interpreted and for providing the non-limitative example of embodiment of the present disclosure, and the disclosure It is not limited to such example.Being intended that all affairs for including in the foregoing description or be shown in the accompanying drawings should be interpreted only It is illustrative rather than restrictive.The variation in details or structure can be made without departing from the disclosure.

The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.

Claims (10)

1. a kind of voltage-to-digit converter characterized by comprising

It is configured as that the switch module of reference voltage and/or common-mode voltage is accessed or turned off according to first control signal；

It is connect with the switch module, is configured as carrying out charge or discharge according to the reference voltage and the common-mode voltage Energy-storage module；

It connect, is configured as after carrying out Δ ∑ modulation feedback to the charge that the energy-storage module exports with the energy-storage module, it is defeated The modulation module of integral voltage out；And

It is connect with the modulation module, is configured as obtaining integral voltage progress quantification treatment according to second control signal The quantizer of digitally encoded signal.

2. voltage-to-digit converter according to claim 1, which is characterized in that the switch module includes: first switch Pipe and second switch；The first control signal includes: the first driving signal and the second driving signal；

Wherein, the first conduction terminal of the first switch tube accesses the reference voltage, the first conducting of the second switch It terminates into the common-mode voltage, the second conduction terminal of the first switch tube and the second conduction terminal of the second switch connect altogether In the energy-storage module；

The control terminal of the first switch tube accesses first driving signal, and the first switch tube is according to first driving The level state of signal is connected or shutdown；

The control terminal of the second switch accesses second driving signal, and the second switch is according to second driving The level state of signal is connected or shutdown.

3. voltage-to-digit converter according to claim 2, which is characterized in that the level state of first driving signal Meet the following conditions with the level state of second driving signal:

In above formula, the logic and operation of the "+" representation signal, the N1 is the level state of the first driving signal, described N2 is the level state of the second driving signal, and the Y=0 or 1 is describedFor the inverse value of the Y, the φ_1dIt is first Level signal, the φ_2dFor second electrical level signal, and the phase cross-over of first level signal and second electrical level signal.

4. voltage-to-digit converter according to claim 1, which is characterized in that the energy-storage module includes: first capacitor；

Wherein, the first termination switch module of the first capacitor, the second termination modulation mould of the first capacitor Block.

5. voltage-to-digit converter according to claim 1, which is characterized in that the modulation module includes:

It is connect with the energy-storage module, is configured as being connected or being turned off according to switching signal, shift and adjusted and is described The switch unit of the charge of energy-storage module output；And

It is connected between the switch unit and the quantizer, is configured as accumulating the charge that the energy-storage module exports Divide and compare amplification, to export the zero location excessively of the integral voltage.

6. voltage-to-digit converter according to claim 5, which is characterized in that the switching signal includes first switch letter Number and second switch signal；

The switch unit includes: variable resistance, third switching tube and the 4th switching tube；

Wherein, the first conduction terminal of the third switching tube accesses the common-mode voltage, the second conducting of the third switching tube The first end of end and the variable resistance is connected to the energy-storage module, the second termination of the variable resistance the 4th switch altogether First conduction terminal of pipe, the second conducting termination of the 4th switching tube is described to cross zero location；

The control terminal of the third switching tube accesses the first switch signal, and the third switching tube is according to the first switch The level state of signal is connected or shutdown；

The control terminal of 4th switching tube accesses the second switch signal, and the 4th switching tube is according to the second switch The level state of signal is connected or shutdown.

7. voltage-to-digit converter according to claim 6, which is characterized in that the first switch signal and described second The phase cross-over of switching signal.

8. voltage-to-digit converter according to claim 6, which is characterized in that the quantizer includes: that first voltage is defeated Enter end, second voltage input terminal, control terminal and digital signal output end；

Wherein, the first voltage input termination of the quantizer is described crosses zero location, the second voltage input terminal of the quantizer The common-mode voltage is connect, the control terminal of the quantizer accesses the second control signal, and the quantizer is according to described second It controls the level state work of signal or stops；

In quantizer work, the quantizer carries out calculus of differences to the integral voltage and the common-mode voltage with life At the digitally encoded signal, the digital signal output end of the quantizer exports the digitally encoded signal；

The phase of the second control signal is identical with the phase of the second switch signal.

9. voltage-to-digit converter according to claim 5, which is characterized in that the zero location of crossing includes: comparator, product Divide capacitor, the 5th switching tube and constant-current source；

Wherein, the first input end of the comparator accesses the common-mode voltage, the second input terminal of the comparator and described The first end of integrating capacitor is connected to the switch unit altogether, and the first of the second end of the integrating capacitor, the 5th switching tube The first end of conduction terminal, the output end of the comparator and the constant-current source is connected to the quantizer altogether, the constant-current source Second end ground connection；

Second the first DC power supply of termination of the 5th switching tube；

The control terminal of 5th switching tube accesses third driving signal, and the 5th switching tube is according to the third driving signal Level state conducting or shutdown.

10. a kind of electric resistance sensor reading circuit characterized by comprising

It is configured the current source of output driving current；

It is connect with the current source, is configured as changing the electric resistance sensor of itself resistance value according to external disturbance amount；

It is connect with the electric resistance sensor, is configured as acquiring the variable quantity of the running current of the electric resistance sensor, and by institute The variable quantity for stating running current is converted to the electric pressure converter of reference voltage；And

The voltage-to-digit converter as described in claim any one of 1-9, the voltage-to-digit converter and the electric pressure converter Connection, the voltage-to-digit converter access the reference voltage and are converted into digitally encoded signal.