CN209167934U - A kind of quick scanning circuit with ohm voltage drop automatic compensation function - Google Patents

Abstract

The utility model discloses a kind of quick scanning circuits with ohm voltage drop automatic compensation function, including AC power source, scan subject circuit, feedback compensation circuit, first shaping circuit, second shaping circuit, frequency detection circuit and compensating module, the input terminal of first shaping circuit is connected with the input terminal of scan subject circuit, the input terminal of second shaping circuit is connected with the output end of scan subject circuit, the connection of the output end of the first input end of frequency detection circuit and the first shaping circuit, the output end connection of the second input terminal and the second shaping circuit of frequency detection circuit, the first input end of compensating module and the first output end of frequency detection circuit connect, second input terminal of compensating module and the second output terminal of frequency detection circuit connect, the third input terminal of compensating module is connect with the output end of scan subject circuit, compensation The output end of module is connected with the feedback end of scan subject circuit；Advantage be it is easy to operate, self-oscillation can be compensated in time.

Description

A kind of quick scanning circuit with ohm voltage drop automatic compensation function

Technical field

The utility model relates to a kind of quick scanning circuits, have ohm voltage drop automatic compensation function more particularly, to one kind Quick scanning circuit.

Background technique

Voltammetry can be followed by changing the electrochemical properties of sweep speed research system to investigate of electrode potential Ring is scanned to obtain the reversed information that other electrochemical techniques can not obtain, and is a kind of currently used electrochemical techniques.Volt-ampere Method is convenient to provide the thermodynamic parameter of chemistry or biochemical species oxidation-reduction process, can also directly see clearly various electrifications The dynamic information of reaction is learned, such as: measuring the heterogeneous electron delivery rate constant of system, investigate the multistep electron transmission mistake of system Journey, detection reaction intermediate generation with react and the adjoint chemical reaction for studying electronics transfer etc..

Potential scan rate used in voltammetry is higher, and the dynamics time window that can be differentiated more prolongs to low side It stretches, faster out-phase or homogeneous reaction can be studied, and more short-life intermediate can be tracked, and can be greatly expanded in this way To the understanding of electronics transfer and Chemical Kinetics.Therefore, quick scanning circuit designing technique is further promotion voltammetry One of key technology of development.It include quickly two kinds of current components in scanning voltammetry output electric current: one is scanning voltage is logical Cross charging current i caused by electrode capacitance_c, i.e., background current, the background current do not include letter needed for Electrochemical Detection Breath；Secondly for faradic currents i caused by electrochemical reaction_f.As the increase background current of scanning speed linearly increases, if Uncontrolled, then background current has the gesture for flooding faradic currents, thus leads to the reduction of output signal-noise ratio.

Document 1 (ZhiyongGuo, Xiangqin Lin*, Zhaoxiang Deng, " Undistorted cyclic voltammograms at scan rates up to 2.5MV·s-1 through positive feedback Compensation of ohmic drop ", Chinese J.Chem.2004,22,913-919.) in propose a kind of double fortune Quick scanning circuit is put, circuit diagram is as shown in Figure 1, the equivalent circuit diagram of electrochemical cell is as shown in Figure 2.The double operational is quickly swept Scanning circuit is realized using positive feedback ohm voltage drop compensation technique, including AC power source Vs, scan subject circuit and feedback compensation electricity Road, scan subject circuit is by electrochemical cell, two operational amplifier amplifier A1 and A2 and five resistance (R, R, R₁、R_fAnd R_s) group At feedback compensation circuit is by a slide rheostat R_w1Composition, the input terminal of scan subject circuit access AC power source Vs, scanning The feedback end and slide rheostat R of main body circuit_w1Sliding end connection, the output end and slide rheostat of scan subject circuit R_w1One end connection.The output voltage of the quick scanning circuit of the double operational can indicate are as follows:

The working principle of the quick scanning circuit of the double operational is: the output voltage of operational amplifier A2 passes through slide rheostat R_W1The non-inverting input terminal of operational amplifier A1 is returned in positive feedback, is superimposed on input scanning signal, is thereby compensated for the solution of electrochemical cell Ohmic voltage drop caused by resistance, eliminates the distortion of volt-ampere curve brought by the solution resistance of electrochemical cell, it is final obtain compared with Good voltammetric signal.But use manually adjusts slide rheostat R_W1The method for realizing positive feedback compensation is difficult to control solution resistance pressure Drop compensation situation, if misoperation, easily there is the case where self-oscillation in circuit, and the presence of the defect makes circuit be difficult to meet Feature easy to operate.

Summary of the invention

It is easy that the technical problem to be solved by the utility model is to provide a kind of positive feedback compensating operations, can eliminate in time The quick scanning circuit with ohm voltage drop automatic compensation function of self-oscillation situation.

Technical solution adopted by the utility model to solve the above technical problems is as follows: a kind of there is ohm voltage drop to compensate automatically The quick scanning circuit of function, including AC power source, scan subject circuit and feedback compensation circuit, the scan subject circuit With input terminal, feedback end and output end, the input terminal of the scan subject circuit is connected with the AC power source, described Feedback compensation circuit include the first shaping circuit, the second shaping circuit, frequency detection circuit and compensating module, described the The input terminal of one shaping circuit is connected with the input terminal of the scan subject circuit, the input terminal of second shaping circuit Connected with the output end of the scan subject circuit, the frequency detection circuit have first input end, the second input terminal, First output end and second output terminal, the first input end of the frequency detection circuit and first shaping circuit it is defeated Outlet connection, the second input terminal of the frequency detection circuit is connected with the output end of second shaping circuit, described Compensating module there is first input end, the second input terminal, third input terminal and output end, the first of the compensating module be defeated Enter end to connect with the first output end of the frequency detection circuit, the second input terminal of the compensating module and the frequency The second output terminal of rate detection circuit connects, and the third input terminal of the compensating module is defeated with the scan subject circuit Outlet connection, the output end of the compensating module are connected with the feedback end of the scan subject circuit, and described first is whole Shape circuit is described for acquiring the input end signal of the scan subject circuit in real time and generating the output of first frequency signal Second shaping circuit is exported for acquiring the output end signal of the scan subject circuit in real time and generating second frequency signal, The frequency detection circuit generates first control signal according to the first frequency signal and the second frequency signal Be sent to the compensating module with second control signal, the compensating module be used for according to the first control signal, The second control signal and the scan subject circuit output end signal generate thermal compensation signal and are sent to the scanning The feedback end of main body circuit compensates.

First shaping circuit includes the first operational amplifier and first resistor, the first operation amplifier utensil There are positive input, reverse input end and an output end, the positive input ground connection of first operational amplifier, described the The reverse input end of one operational amplifier be first shaping circuit input terminal, first operational amplifier it is defeated Outlet is connected with one end of the first resistor and its connecting pin is the output end of first shaping circuit, and described the The other end of one resistance accesses power supply, the circuit of the circuit structure of second shaping circuit and first shaping circuit Structure is identical.

The frequency detection circuit includes that 1M has source crystal oscillator, clock frequency division module, frequency comparison module, the first D triggering Device, the second d type flip flop, third d type flip flop, the first counter, the second counter, the one or two input with door and the two or two input with Door, the clock frequency division module have input terminal, the first output end and second output terminal, and the frequency comparison module has Clock end, first input end, the second input terminal, the first output end and second output terminal, it is first d type flip flop, described Second d type flip flop and the third d type flip flop are respectively provided with clock end, enable end, input terminal and output end, and described first Counter and second counter are respectively provided with input terminal, clear terminal and output end, the one or two input and door and Two or two input is respectively provided with first input end, the second input terminal and output end with door, and the 1M has source crystal oscillator Output end is connect with the clock end of the input terminal of the clock frequency division module and the frequency comparison module respectively, described First output end of clock frequency division module is connected with the input terminal of first d type flip flop, the clock frequency division module Second output terminal is connect with the clear terminal of the clear terminal of first counter and second counter respectively, described The clock end of first d type flip flop and the two or two input are connect with the second input terminal of door and its connecting pin is the frequency The first input end of rate detection circuit, the output end of first d type flip flop, described one or two input and door it is first defeated Enter end, the two or two input and the first input end of door, the clock end of second d type flip flop and the 3rd D The clock end of trigger connects, and the first input end of the one or two input and door is the second of the frequency detection circuit Input terminal, the one or two input are connect with the output end of door with the input terminal of first counter, and described second Two inputs are connect with the output end of door with the input terminal of second counter, the output end of first counter and institute The input terminal for the second d type flip flop stated connects, the input of the output end of second counter and the third d type flip flop End connection, the output end of second d type flip flop connects with the first input end of the frequency comparison module, and described the The output end of 3d flip-flop is connected with the second input terminal of the frequency comparison module, and the of the frequency comparison module One output end is the first output end of the frequency detection circuit, and the second output terminal of the frequency comparison module is described Frequency detection circuit second output terminal, the enable end of first d type flip flop, second d type flip flop it is enabled High level is accessed in end and the enable end of the third d type flip flop.In the circuit, caused by clock frequency division module when 10HZ Clock signal is used as " gate " signal (high level is effective), and is used as " door by the first frequency signal that the first shaping circuit generates The open and close of control " signal regulating gate, within the gate opening time (i.e. when the first d type flip flop output is high level), the One counter and the second counter start to first frequency signal caused by the first shaping circuit and the second shaping circuit and Two frequency signals carry out high level counting (being recorded in the high level number in gate time), are achieved in frequency detecting function Can, it is unrelated with the frequency of measured signal when which carries out frequency detecting, it is only electric with the height of gate opening time and measured signal Flat number is related, improves the measurement accuracy of channel frequency detection, and measuring speed is faster.

The frequency comparison module includes adder, digital comparator, four d flip-flop and the 5th d type flip flop, described Adder there is the first addend input terminal, the second addend input terminal and output end, the digital comparator has first defeated Enter end, the second input terminal and output end, the four d flip-flop and the 5th d type flip flop be respectively provided with input terminal, when Zhong Duan, enable end and output end, the first addend input terminal of the adder are the first defeated of the frequency comparison module Enter end, the second addend input terminal of the adder is the second input terminal of the frequency comparison module, the addition The output end of device is connected with the first input end of the digital comparator, the second input terminal access of the digital comparator Reference signal, the reference signal are hexadecimal number 2, the output end of the digital comparator and the 4th D touching The enable end connection of device is sent out, the input terminal of the four d flip-flop is connected with the output end of the four d flip-flop and it Connecting pin is the first output end of the frequency comparison module, and the input terminal of the 5th d type flip flop accesses low level, institute High level, the clock end of the four d flip-flop and the 5th D triggering are accessed in the enable end for the 5th d type flip flop stated The clock end of device connects and its connecting pin is the clock end of the frequency comparison module, the output of the 5th d type flip flop The second output terminal of the end frequency comparison module.The circuit introduces four d flip-flop and the 5th d type flip flop, will be according to warp It crosses after adder and digital comparator carry out frequency relatively as a result, the different first control signal and the second control of automatic output (if digital comparator output is low level, first control signal is low level signal to signal, and second control signal is square wave letter Number；If digital comparator output is high level, first control signal is low level signal, and second control signal is low level letter Number or high level signal), thus the circuit ensure that entire circuit is in fully automatic working state, improve circuit operation letter Just property.

The compensating module includes the digital regulation resistance of model X9C103, and the 1st foot of the digital regulation resistance is Second input terminal of the compensating module, the 2nd foot of the digital regulation resistance are the first input of the compensating module End, the 3rd foot of the digital regulation resistance are the third input terminal of the compensating module, the 5th of the digital regulation resistance the Foot is the output end of the compensating module, and the 8th foot of the digital regulation resistance connects power supply, the of the digital regulation resistance 4 feet, the 6th foot and the 7th foot are grounded.

The scan subject circuit includes second operational amplifier, third operational amplifier, electrochemical cell, the second electricity Resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance；The second operational amplifier and the third operation Amplifier is respectively provided with positive input, reverse input end and output end, and one end of the second resistance is the scanning The input terminal of main body circuit, the other end of the second resistance, one end of the 3rd resistor and second operation The reverse input end of amplifier connects, and the positive input of the second operational amplifier is the scan subject circuit Feedback end, the other end of the 3rd resistor, the output end of the second operational amplifier and the electrochemical cell Anode connection, the cathode of the electrochemical cell, one end of the 6th resistance and the third operational amplifier are just It is connected to input terminal, the other end of the 6th resistance ground connection, it is the reverse input end of the third operational amplifier, described One end of the 4th resistance connected with one end of the 5th resistance, the other end ground connection of the 4th resistance is described The other end of 5th resistance is connected with the output end of the third operational amplifier and its connecting pin is the scan subject The output end of circuit.

Compared with prior art, the utility model has the advantage of pass through the real-time acquisition scans main body electricity of the first shaping circuit The input end signal on road generates first frequency signal, and the second shaping circuit is the output end signal of real-time acquisition scans main body circuit Generate second frequency signal, frequency detection circuit generate after frequency detecting the to first frequency signal and second frequency signal One control signal and second control signal are sent to compensating module, if scan subject circuit is in non-self oscillating regime, the One control signal is low level signal, and second control signal is low level signal or high level signal, if at scan subject circuit In self oscillating regime, the second shaping circuit will generate the higher frequency signal of frequency, then first control signal is low level Signal, second control signal are square-wave signal, and compensating module is according to first control signal, second control signal and scan subject electricity Road output end signal generates thermal compensation signal and is sent to the feedback end of scan subject circuit and compensates, it is possible thereby to avoid in time There is a situation where self-oscillation, since each module is real-time perfoming work in the utility model, the utility model Work will be performed fully automatic in scanning circuit, be not necessarily to manual operation, so as to avoid electricity for a long time is caused because of human operational error Road is in the case where self oscillating regime, improves the ease-to-operate of quick scanning circuit.

Detailed description of the invention

Fig. 1 is the circuit diagram of the quick scanning circuit of existing double operational；

Fig. 2 is the equivalent circuit diagram of electrochemical cell；

Fig. 3 is the structure chart of the quick scanning circuit of the utility model；

Fig. 4 is the circuit diagram of first shaping circuit of the utility model；

Fig. 5 is the circuit diagram of the frequency detection circuit of the utility model；

Fig. 6 is the circuit diagram of the frequency comparison module of the utility model；

Fig. 7 is the circuit diagram of the compensating module of the utility model；

Fig. 8 is the circuit diagram of the scan subject circuit of the utility model.

Specific embodiment

The utility model is described in further detail below in conjunction with figure embodiment.

Embodiment one: as shown in figure 3, a kind of quick scanning circuit with ohm voltage drop automatic compensation function, including hand over Galvanic electricity source, scan subject circuit and feedback compensation circuit, scan subject circuit have input terminal, feedback end and output end, scanning The input terminal of main body circuit is connected with AC power source, and feedback compensation circuit includes the first shaping circuit, the second shaping circuit, frequency The input terminal of detection circuit and compensating module, the first shaping circuit is connected with the input terminal of scan subject circuit, the second shaping The input terminal of circuit is connected with the output end of scan subject circuit, frequency detection circuit have first input end, the second input terminal, The output end of first output end and second output terminal, the first input end of frequency detection circuit and the first shaping circuit connects, frequency The output end connection of the second input terminal and the second shaping circuit of rate detection circuit, compensating module have first input end, second Input terminal, third input terminal and output end, the first input end of compensating module and the first output end of frequency detection circuit connect, Second input terminal of compensating module and the second output terminal of frequency detection circuit connect, the third input terminal of compensating module and scanning The output end of main body circuit connects, and the output end of compensating module is connected with the feedback end of scan subject circuit, the first shaping circuit For real-time acquisition scans main body circuit input end signal and generate the output of first frequency signal, the second shaping circuit is for real When acquisition scans main body circuit output end signal and generate second frequency signal output, frequency detection circuit is according to first frequency Signal and second frequency signal generate first control signal and second control signal is sent to compensating module, and compensating module is used for root Thermal compensation signal, which is generated, according to first control signal, second control signal and scan subject circuit output end signal is sent to scan subject The feedback end of circuit compensates.

In the present embodiment, as shown in figure 4, the first shaping circuit includes the first operational amplifier U1 and first resistor R1, the One operational amplifier U1 has positive input, reverse input end and output end, the positive input of the first operational amplifier U1 Ground connection, the reverse input end of the first operational amplifier U1 are the input terminal of the first shaping circuit, and the first operational amplifier U1's is defeated Outlet is connected with one end of first resistor R1 and its connecting pin is the output end of the first shaping circuit, the other end of first resistor R1 Power supply is accessed, the circuit structure of the second shaping circuit is identical as the circuit structure of the first shaping circuit.

In the present embodiment, as shown in figure 5, frequency detection circuit includes that 1M has source crystal oscillator, clock frequency division module, frequency to compare Module, the first d type flip flop D1, the second d type flip flop D2, third d type flip flop D3, the first counter S1, the second counter S2, first Two inputs have input terminal, the first output end and second output terminal with the input of door A1 and the two or two and door A2, clock frequency division module, Frequency comparison module has clock end, first input end, the second input terminal, the first output end and second output terminal, the first D triggering Device D1, the second d type flip flop D2 and third d type flip flop D3 are respectively provided with clock end, enable end, input terminal and output end, the first meter Number device S1 and the second counter S2 is respectively provided with input terminal, clear terminal and output end, and the one or two input is defeated with door A1 and the two or two Enter and be respectively provided with first input end, the second input terminal and output end with door A2,1M has the output end of source crystal oscillator to divide respectively with clock The input terminal of frequency module is connected with the clock end of frequency comparison module, the first output end of clock frequency division module and the first D triggering The input terminal of device D1 connects, and the second output terminal of clock frequency division module is counted with the clear terminal of the first counter S1 and second respectively The clear terminal of device S2 connects, the clock end of the first d type flip flop D1 and the two or two input is connect with the second input terminal of door A2 and it Connecting pin is the first input end of frequency detection circuit, the output end of the first d type flip flop D1, the one or two input and the first of door A1 Input terminal, the two or two input and the first input end of door A2, the clock end of the second d type flip flop D2 and third d type flip flop D3 when The connection of clock end, the one or two input are the second input terminal of frequency detection circuit with the first input end of door A1, the one or two input with The output end of door A1 is connect with the input terminal of the first counter S1, the output end and the second counter S2 of the two or two input and door A2 Input terminal connection, the input terminal connection of the output end of the first counter S1 and the second d type flip flop D2, the second counter S2's is defeated Outlet is connected with the input terminal of third d type flip flop D3, the first input of the output end and frequency comparison module of the second d type flip flop D2 End connection, the output end of third d type flip flop D3 are connected with the second input terminal of frequency comparison module, and the first of frequency comparison module Output end is the first output end of frequency detection circuit, and the second output terminal of frequency comparison module is the second of frequency detection circuit The enable end of output end, the enable end of the first d type flip flop D1, the enable end of the second d type flip flop D2 and third d type flip flop D3 connects Enter high level.

In the present embodiment, as shown in fig. 6, frequency comparison module includes adder C1, digital comparator E1, the 4th D triggering Device D4 and the 5th d type flip flop D5, adder C1 have the first addend input terminal, the second addend input terminal and output end, numeric ratio There is first input end, the second input terminal and output end compared with device E1, four d flip-flop D4 and the 5th d type flip flop D5 are respectively provided with Input terminal, clock end, enable end and output end, the first addend input terminal of adder C1 are the first input of frequency comparison module End, the second addend input terminal of adder C1 are the second input terminal of frequency comparison module, the output end and numerical value of adder C1 The first input end of comparator E1 connects, the second input terminal incoming reference signal of digital comparator E1, what reference signal indicated Numerical value is hexadecimal number 2, the enable end connection of the output end and four d flip-flop D4 of digital comparator E1, four d flip-flop The input terminal of D4 and the output end of four d flip-flop D4 connect and its connecting pin is the first output end of frequency comparison module, the The input terminal of five d type flip flop D5 accesses low level, and high level is accessed in the enable end of the 5th d type flip flop D5, four d flip-flop D4's Clock end is connected with the clock end of the 5th d type flip flop D5 and its connecting pin is the clock end of frequency comparison module, the 5th d type flip flop The second output terminal of the output end frequency comparison module of D5.

In the present embodiment, as shown in fig. 7, compensating module includes the digital regulation resistance of model X9C103, digital regulation resistance The 1st foot be compensating module the second input terminal, the 2nd foot of digital regulation resistance is the first input end of compensating module, number electricity 3rd foot of position device is the third input terminal of compensating module, and the 5th foot of digital regulation resistance is the output end of compensating module, number electricity 8th foot of position device connects power supply, and the 4th foot, the 6th foot and the 7th foot of digital regulation resistance are grounded.

In the present embodiment, as shown in figure 8, scan subject circuit includes second operational amplifier U2, third operational amplifier U3, electrochemical cell, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R5；Second operation Amplifier U2 and third operational amplifier U3 are respectively provided with positive input, reverse input end and output end, second resistance R2's One end is the input terminal of scan subject circuit, the other end of second resistance R2, one end of 3rd resistor R3 and the second operation amplifier The reverse input end of device U2 connects, and the positive input of second operational amplifier U2 is the feedback end of scan subject circuit, third The anode connection of the other end of resistance R3, the output end of second operational amplifier U2 and electrochemical cell, the cathode of electrochemical cell, the One end of six resistance R5 is connected with the positive input of third operational amplifier U3, the other end ground connection of the 6th resistance R5, third The reverse input end of operational amplifier U3, the 4th resistance R4 one end connected with one end of the 5th resistance R5, the 4th resistance R4's Other end ground connection, the other end of the 5th resistance R5 is connected with the output end of third operational amplifier U3 and its connecting pin is scanning master The output end of body circuit.

The working principle of the quick scanning circuit of the utility model are as follows: pass through the real-time acquisition scans main body of the first shaping circuit The input end signal of circuit simultaneously generates the output of first frequency signal, passes through the real-time acquisition scans main body circuit of the second shaping circuit Output end signal simultaneously generates the output of second frequency signal.When the output end signal of scan subject circuit is in self oscillating regime When, the second shaping circuit will generate the biggish second frequency signal of frequency, and frequency detection circuit is controlled low level first is generated Signal (low level signal) and second control signal (square-wave signal) are sent to compensating module, and compensating module is believed according to the first control Number, second control signal and scan subject circuit output end signal generate the feedback end that thermal compensation signal is sent to scan subject circuit It compensates, until circuit is changed into non-self oscillating regime from self oscillating regime.If working as the output end of scan subject circuit Signal is in non-self oscillating regime, and frequency detection circuit will generate first control signal (low level signal) and the second control letter Number (low level signal or high level signal) is sent to compensating module, and compensating module, which will generate constant thermal compensation signal and be sent to, to be swept The feedback end for retouching main body circuit compensates, and compensation is completed in indication circuit at this time.

Claims (6)

1. a kind of quick scanning circuit with ohm voltage drop automatic compensation function, including AC power source, scan subject circuit and Feedback compensation circuit, the scan subject circuit have input terminal, feedback end and output end, the scan subject circuit Input terminal is connected with the AC power source, it is characterised in that the feedback compensation circuit includes the first shaping circuit, second Shaping circuit, frequency detection circuit and compensating module, the input terminal of first shaping circuit and the scan subject The input terminal of circuit connects, and the input terminal of second shaping circuit is connected with the output end of the scan subject circuit, The frequency detection circuit has first input end, the second input terminal, the first output end and second output terminal, the frequency The first input end of detection circuit is connected with the output end of first shaping circuit, and the second of the frequency detection circuit Input terminal is connected with the output end of second shaping circuit, and the compensating module has first input end, the second input End, third input terminal and output end, the first of the first input end of the compensating module and the frequency detection circuit are defeated Outlet connection, the second input terminal of the compensating module is connect with the second output terminal of the frequency detection circuit, described The third input terminal of compensating module connect with the output end of the scan subject circuit, the output end of the compensating module It is connected with the feedback end of the scan subject circuit, first shaping circuit for acquiring the scan subject in real time The input end signal of circuit simultaneously generates the output of first frequency signal, and second shaping circuit for acquiring described sweep in real time It retouches the output end signal of main body circuit and generates the output of second frequency signal, the frequency detection circuit is according to described first Frequency signal and the second frequency signal generate first control signal and second control signal is sent to the compensation mould Block, the compensating module are used for according to the first control signal, the second control signal and the scanning master The feedback end that body circuit output end signal generation thermal compensation signal is sent to the scan subject circuit compensates.

2. a kind of quick scanning circuit with ohm voltage drop automatic compensation function according to claim 1, feature exist It include the first operational amplifier and first resistor in first shaping circuit, first operational amplifier has forward direction Input terminal, reverse input end and output end, the positive input ground connection of first operational amplifier, first operation The reverse input end of amplifier be first shaping circuit input terminal, the output end of first operational amplifier and One end of the first resistor connects and its connecting pin is the output end of first shaping circuit, the first resistor The other end access power supply, the circuit structure phase of the circuit structure of second shaping circuit and first shaping circuit Together.

3. a kind of quick scanning circuit with ohm voltage drop automatic compensation function according to claim 1, feature exist It include that 1M has source crystal oscillator, clock frequency division module, frequency comparison module, the first d type flip flop, second in the frequency detection circuit D type flip flop, third d type flip flop, the first counter, the second counter, the one or two input and door and the two or two input and door, it is described Clock frequency division module have input terminal, the first output end and second output terminal, the frequency comparison module have clock end, First input end, the second input terminal, the first output end and second output terminal, first d type flip flop, the 2nd D touching Hair device and the third d type flip flop are respectively provided with clock end, enable end, input terminal and output end, first counter Input terminal, clear terminal and output end are respectively provided with second counter, the one or two input and door and described Two or two input is respectively provided with first input end, the second input terminal and output end with door, and the 1M has the output end of source crystal oscillator It is connect respectively with the clock end of the input terminal of the clock frequency division module and the frequency comparison module, the clock point First output end of frequency module is connected with the input terminal of first d type flip flop, and the second of the clock frequency division module is defeated Outlet is connect with the clear terminal of the clear terminal of first counter and second counter respectively, the first D The clock end of trigger and the two or two input are connect with the second input terminal of door and its connecting pin is that the frequency is examined The first input end of slowdown monitoring circuit, the output end of first d type flip flop, the one or two input are inputted with the first of door End, the two or two input are touched with the first input end of door, the clock end of second d type flip flop and the 3rd D Send out the clock end connection of device, the first input end of described one or two input and door is second defeated for the frequency detection circuit Entering end, the one or two input is connect with the output end of door with the input terminal of first counter, and the described the 2nd 2 Input is connect with the output end of door with the input terminal of second counter, the output end of first counter and described The second d type flip flop input terminal connection, the input terminal of the output end of second counter and the third d type flip flop Connection, the output end of second d type flip flop are connected with the first input end of the frequency comparison module, the third The output end of d type flip flop is connected with the second input terminal of the frequency comparison module, and the first of the frequency comparison module Output end is the first output end of the frequency detection circuit, and the second output terminal of the frequency comparison module is described The second output terminal of frequency detection circuit, the enable end of first d type flip flop, second d type flip flop enable end High level is accessed with the enable end of the third d type flip flop.

4. a kind of quick scanning circuit with ohm voltage drop automatic compensation function according to claim 3, feature exist In the frequency comparison module include adder, digital comparator, four d flip-flop and the 5th d type flip flop, the addition Device has the first addend input terminal, the second addend input terminal and output end, and the digital comparator has first input end, the Two input terminals and output end, the four d flip-flop and the 5th d type flip flop are respectively provided with input terminal, clock end, make Energy end and output end, the first addend input terminal of the adder are the first input end of the frequency comparison module, institute Second addend input terminal of the adder stated is the second input terminal of the frequency comparison module, the output of the adder End is connected with the first input end of the digital comparator, and the second input terminal access of the digital comparator is with reference to letter Number, the numerical value that the reference signal indicates is hexadecimal number 2, the output end of the digital comparator and the described the 4th The enable end of d type flip flop connects, and the input terminal of the four d flip-flop is connected with the output end of the four d flip-flop And its connecting pin is the first output end of the frequency comparison module, the input terminal of the 5th d type flip flop accesses low electricity Flat, high level, the clock end of the four d flip-flop and the 5th D are accessed in the enable end of the 5th d type flip flop The clock end of trigger connects and its connecting pin is the clock end of the frequency comparison module, the 5th d type flip flop The second output terminal of frequency comparison module described in output end.

5. a kind of quick scanning circuit with ohm voltage drop automatic compensation function according to claim 1, feature exist In the digital regulation resistance that the compensating module includes model X9C103, the 1st foot of the digital regulation resistance is described Second input terminal of compensating module, the 2nd foot of the digital regulation resistance is the first input end of the compensating module, described Digital regulation resistance the 3rd foot be the compensating module third input terminal, the 5th foot of the digital regulation resistance is described Compensating module output end, the 8th foot of the digital regulation resistance connects power supply, the 4th foot of the digital regulation resistance, the 6th Foot and the 7th foot are grounded.

6. a kind of quick scanning circuit with ohm voltage drop automatic compensation function according to claim 1, feature exist In the scan subject circuit include second operational amplifier, third operational amplifier, electrochemical cell, second resistance, third Resistance, the 4th resistance, the 5th resistance and the 6th resistance；The second operational amplifier and the third operational amplifier point Not Ju You positive input, reverse input end and output end, one end of the second resistance is the scan subject circuit Input terminal, the other end of the second resistance, one end of the 3rd resistor and the second operational amplifier Reverse input end connection, the positive input of the second operational amplifier are the feedback end of the scan subject circuit, The anode of the other end of the 3rd resistor, the output end of the second operational amplifier and the electrochemical cell is even It connects, the positive input of the cathode of the electrochemical cell, one end of the 6th resistance and the third operational amplifier End connection, the other end ground connection of the 6th resistance, the reverse input end of the third operational amplifier, the described the 4th One end of resistance is connected with one end of the 5th resistance, the other end ground connection of the 4th resistance, the 5th electricity The other end of resistance is connected with the output end of the third operational amplifier and its connecting pin is the scan subject circuit Output end.