CN101644591A - Mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply - Google Patents
Mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply Download PDFInfo
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Abstract
The invention relates to a mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply, comprising a constant current source circuit, a current bypass circuit,an exciting coil driving circuit, an excitation time sequence generating circuit and a galvo circuit. A high voltage power supply is adopted for supplying power, the constant current source is constructed by linear power supply to supplying electricity for the exciting coil driving circuit, the current bypass circuit is jointed in parallel with the input/output end of the linear power supply to solve the problem of energy dissipation, the exciting coil driving circuit is composed of an H bridge and a control circuit thereof, the galvo circuit is bridge-jointed between the lower end of the H bridge and a reference ground, and a digital signal processor (DSP) is used for controlling multiple switches and an electrical level matching device to generate time sequence and control the action ofthe exciting coil driving circuit. The excitation control system can obviously improve excitation frequency range and excitation frequency preciseness, is suitable for single frequency high frequencysquare wave excitation or dual frequency square wave excitation, and can simultaneously provide more exact current detection to correct the flow signal processing result.
Description
Technical field
The present invention relates to field of flow detection, be a kind of electromagnetic flow meter excitation control system that can realize single-frequency high frequency square wave and double frequency square-wave excitation based on linear power supply, employing DSP control hardware circuit.
Background technology
Electromagnetic flowmeter imposes on detected fluid by field coil with magnetic field, and detected fluid motional induction in magnetic field goes out induction electromotive force, detects and handles this electromotive force signal and can obtain rate of flow of fluid, thereby realize flow measurement.Current, excitation mode mainly is the low-frequency square-wave excitation, is promptly powered to field coil by constant current source, and constantly sense of current in the switched energization coil makes exciting current change periodically between positive and negative steady state value.During exciting current was constant, the electromagnetic flow transducer output signal can obtain stable zero point.Yet, in order to realize must improving the excitation frequency of electromagnetic flowmeter to the measurement of slurry fluids and the dynamic response performance that improves flowmeter, the cycle shortens like this, exciting current just is not easy to enter stable state, thereby sensor output signal just is difficult for obtaining stable zero point.
Existing research and the relevant patent that much relates to excitation control in the prior art, main research is how to carry out the constant current control of field coil with summary of the invention.Mainly contain three approach: one, by feedback current control PWM dutycycle, thereby the voltage swing of control excitation power supply, come stabilization of excitation electric current, U.S. Pat 5639970 (RobertK.Schulz for example, Plymouth, Minn.Current Selsection Circuitry for Magnetic Flowmeter), US6477070B2 (Joel Schweitzer, Issenheim.Current-Regulator Circuit of an ElectromagneticFlowmeter), US4563904 (Gottfried Geisler, Jorg-Ulrich Breithaupt.Excitation Circuit ForElectromagnetic Flowmeter); Two, control the break-make of exciting bridge way switch by feedback current, and then utilize the characteristic that electric current can not suddenly change in the field coil to carry out constant current control, U.S. Pat 4663976 (Kazuie Suzuki for example, Takashi Torimaru, Hironobu Ohta.Electromagnetic Flowmeter), the Chinese patent publication number be CN1734240A (Ishikawa Yu Guang. electromagnetic flowmeter); Three, compare by feedback current and reference current value, and then wait oxide-semiconductor control transistors by amplifier, and realize constant current control, for example the Chinese patent publication number is that CN87101677A (protect by holt, Hessen strong one, pretty Teng Mao, Song Yongyi then, the bird ball is still, Su Guxian is great, field half is gone up loyal. electromagnetic flowmeter), publication number be CN2916586Y (Ma Bo, Li Xinghua. electromagnetic flowmeter pressure-adjusting type digital constant-current source).Yet approach one is to control the driving source voltage swing, still, because PWM dutycycle control driving voltage need pass through LC filtering, its dynamic responding speed is slower, can cause the hysteresis of Current Control, thereby electric current is difficult for entering steady-state value when the high frequency excitation, causes the shakiness at zero point; Approach two can make H bridge switch devices switch frequent, and ripple appears in electric current to a certain extent, can cause the fluctuation at zero point equally; The constant current control of approach three can make its low voltage undulation bigger all at exciting coil drive circuit H bridge low side, influences H brachium pontis conducting control; Simultaneously, when exciting current reaches stable state, the pressure drop that drops on the transistor Q2 will be very big among described patent CN87101677A Fig. 8, thereby make its power dissipation bigger; Though and reduce driving voltage by FEEDBACK CONTROL among patent CN2916586Y Fig. 4 when electric current enters stable state and then reduce the power consumption of transistor T, yet its feedback pressure regulation remains adopts the PWM adjusting pressure measure, can introduce described approach one existing problem.
Therefore, big in the field coil inductance value, when exciting current is big, be difficult to improve excitation frequency, make exciting current after direction is switched, can enter steady-state value and then assurance zero stability.Existing document does not disclose the scheme of head it off, but by obtaining zero stability relatively preferably such as modes such as dual-frequency excitations by signal Processing.In addition, for the foundation of electric current correction more accurately is provided to signal processing unit, need accurately to detect the exciting current size, and there is certain error in electric current in its emitter-base bandgap grading detection gained electric current and the field coil because the effect of transistorized base current or other bias current can make in the approach three described patents.The selection of H bridge brachium pontis switching tube type can influence the precision of current detecting and the difficulty or ease of switch control equally, and does not all disclose the type selecting of switching tube and the details of control thereof in the prior art.Simultaneously, how MCU does not carry out the excitation time sequence control when all disclosing single-frequency excitation or dual-frequency excitation in the prior art, and excitation time sequence control precision direct relation the precision of excitation frequency, and this handles electromagnetic flowmeter signal is necessary.
Summary of the invention
The present invention will solve some electromagnetic flowmeter system excitation control problem that exist in the prior art, provide a kind of can carry out high frequency single-frequency square-wave excitation or double frequency square-wave excitation and guarantee zero stability, excitation frequency accurately, exciting current detects electromagnetic flow meter excitation control system accurately.
The technical solution adopted in the present invention is: use the high voltage source power supply, adopt linear power supply structure constant current source, excitation control H bridge is powered, improving the dynamic responding speed of excitation constant current control, thereby provide condition for high frequency single-frequency square-wave excitation or double frequency square-wave excitation with balanced null point; Employing current bypass circuit solves the power dissipation problems on the linear power supply; The linear power supply constant-current control circuit all is positioned at H bridge high-end (power end), and H bridge low side only connects with reference to ground by low resistance inspection leakage resistance, thereby guarantees the stability of H bridge low side; Adopt fluidic devices PNP pipe as switching tube at the high-end brachium pontis of H bridge, thereby avoid because of the difficult stable problem of controlling of high-end voltage instability by its conducting of Current Control, low side adopts voltage-controlled device metal-oxide-semiconductor as switching tube, by its conducting of Control of Voltage; Because the inspection leakage resistance is between H bridge low side and ground, and the grid current of metal-oxide-semiconductor is very little, in addition, carries out the switching device interlock control of H bridge diagonal angle in the excitation process, thereby can guarantee to detect with the inspection leakage resistance in each stage of excitation the accuracy of exciting current; The ON-OFF control circuit of H bridge is realized by darlington array pipe jointing triode and resistance; The darlington array pipe receives the excitation clock signal that the excitation timing sequence generating circuit is sent; The excitation timing sequence generating circuit cooperates multi-way switch and level match device to form by digital signal processor (DSP), the excitation timing control signal is produced by peripheral hardware control on digital signal processor (DSP) chip, and in the excitation process, do not need software to participate in, thereby improve the excitation frequency precision.
System of the present invention comprises: constant-current source circuit 1, current bypass circuit 5, exciting coil drive circuit 2, excitation timing sequence generating circuit 3 and galvanometer circuit 4, as shown in Figure 1.
Described constant-current source circuit is made up of linear power supply U1 and resistance R 1, wherein the size of resistance R 1 decision constant current source output current.
Described current bypass circuit is made up of triode T5, T6, T7, T8, resistance R 13, R14, R15 and adjustable resistance R16, capacitor C 3, wherein each triode power consumption and by-pass current size all can be passed through resistance R 14, R15, R16 regulate, and the size of current of U1 in the constant-current source circuit is flow through in resistance R 13 decisions.
The H bridge is high-end in the described exciting coil drive circuit is made up of current control device PNP triode T1 and T2, and low side is made up of voltage control device N-channel MOS pipe Q1 and Q2; It is all anti-and protect diode that the collection interpolar is penetrated in T1, T2 inside, and the inner drain-source interpolar of Q1, Q2 is all anti-and protect diode; Control circuit is made up of darlington array pipe U2, triode T3, T4 and resistance R 3, R4, R5, R6, R7, R8, R9, R10, R11, R12.
Described galvanometer circuit is made up of resistance R 2, and R2 is connected across H bridge low side and with reference between the ground, forms mode according to H bridge diagonal angle interlock control mode and H bridge, and its both end voltage can more accurately reflect the size of current in each excitation stage in the field coil.
Described excitation timing sequence generating circuit is by core control part DSP chip U3, and multi-way switch chip U4 and level match device U5 form; Go up peripheral hardware by DSP chip U3 and send excitation control signal, produce the excitation sequential in conjunction with multi-way switch, the line level of going forward side by side coupling realizes list/dual-frequency excitation, need not software program control in the excitation process, thereby improves the precision of excitation frequency; The 45th pin of U3, the 53rd pin, the 55th pin are connected with U4 the 15th pin, the 9th pin, the 1st pin respectively; The 11st pin of U4, the 10th pin are connected with the 7th pin, the 8th pin of U5 respectively; The 14th pin of U5, the 13rd pin be output timing control signal CON1 respectively, CON2.
The course of work of the present invention is: the H bridge power supply of constant-current source circuit 1 in exciting coil drive circuit 2, the H bridge drives field coil, exciting current is flowed to reference to ground through switch transistor T 1 (or switch transistor T 2), field coil, switching tube Q2 (or switching tube Q1), inspection leakage resistance (galvanometer circuit) by the high-end inflow of H bridge.In the H bridge switch transistor T 1, T2 inside penetrate between the collection utmost point and the inner drain-source utmost point of Q1, Q2 between anti-respectively and protect diode; digital signal processor in the excitation timing sequence generating circuit (DSP) produces excitation control signal; produce the excitation sequential by multi-way switch; carry out the break-make of darlington array pipe in the level match control exciting coil drive circuit 2 or triode again by the level match device; and then the current path of control H bridge, as shown in Figure 2.When energy dissipation is bigger on the linear power supply, the linear power supply input/output terminal also connects the current bypass circuit, the required electric current of load is branched in the bypass circuit, and avoid it all by linear power supply U1, to reduce the energy dissipation on the linear power supply U1, as shown in Figure 5.
Description of drawings
Fig. 1 is an exciter control system block diagram of the present invention;
Fig. 2 is a specific embodiment of the invention exciter control system schematic diagram;
Fig. 3 is a specific embodiment of the invention excitation timing sequence generating circuit schematic diagram;
Fig. 4 is that the present invention encourages timing sequence generating circuit excitation timing control signal figure;
Fig. 5 is the exciter control system schematic diagram of specific embodiment of the invention belt current bypass circuit.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing:
Design philosophy of the present invention is: use the high voltage source power supply, adopt linear power supply to improve the dynamic perfromance of excitation system, thereby provide condition for high frequency single-frequency square-wave excitation and the double frequency square-wave excitation with balanced null point; Detect exciting current more accurately, for signal Processing provides condition, so that revise sensor output signal; Adopt digital signal processor (DSP) control, and be equipped with the external hardware circuit, produce the excitation sequential, to improve the excitation frequency precision; Adopt the mode of current bypass circuit shunting, reduce the heating on the linear power supply.Its objective is to high frequency excitation or dual-frequency excitation accurately are provided, guarantee that simultaneously exciting current all can enter stable state in the excitation process in each excitation direction interval, and then guarantee zero stability, and exciting current can be by in real time, detect accurately.
The The general frame of exciter control system of the present invention as shown in Figure 1.Constant-current source circuit 1 provides power supply for exciting coil drive circuit 2,5 pairs of linear power supply electric currents of current bypass circuit play shunting (Ip) effect, exciting coil drive circuit 2 provides the exciting current of cycle variation for field coil by CD1 end and CD2 end, galvanometer circuit 4 detects exciting current, excitation timing sequence generating circuit 3 provides control timing signal CON1 and CON2 to exciting coil drive circuit 2, realizes high frequency square wave excitation or double frequency square-wave excitation.
Figure 2 shows that the not electromagnetic flow meter excitation control system circuit theory diagrams of belt current bypass circuit.
Constant-current source circuit 1 is made up of linear power supply U1, resistance R 1, schottky diode D1, diode D2 and capacitor C 17.Change the output constant current value by regulating R1.Capacitor C 1 plays the effect of input power filter.Schottky diode D1 is anti-and in U1 input, output terminal, plays the power protection effect.Diode D2 plays protection U1 for preventing that electric current produces in the other direction.
Exciting coil drive circuit 2 is made up of PNP triode T1, T2, N-channel MOS pipe Q1 and Q2, darlington array pipe U2, resistance R 2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, Zener diode Z1, capacitor C 2.PNP triode T1, T2 and N-channel MOS pipe Q1 and Q2 form full H bridge.Wherein, between emitter of T1, T2 inside (abbreviation emitter-base bandgap grading) and the collector all anti-and the protection diode, between inner drain electrode of Q1, Q2 and the source electrode all anti-and the protection diode.The H bridge is high-end be the emitter-base bandgap grading of T1, T2 pipe by constant-current source circuit 1 power supply, its low side is that the source electrode of Q1, Q2 connects with reference to ground by inspection leakage resistance R2.The collector of T1 links to each other with the drain electrode of Q1, connects the CD1 end that drives field coil L1; The collector of T2 links to each other with the drain electrode of Q2, meets the other end CD2 that drives field coil L1.The ON-OFF control circuit of T1 is made up of resistance R 3, R4, R5 and triode T3, control the break-make of T3 by the timing control signal CON1 that receives excitation timing sequence generating circuit 3, and then the base current of control T1, make its state that is operated in saturation conduction or ends, thus switch T1.The ON-OFF control circuit of T2 is made up of resistance R 6, R7, R8 and triode T4, control the break-make of T4 by the timing control signal CON2 that receives excitation timing sequence generating circuit 3, and then the base current of control T2, make its state that is operated in saturation conduction or ends, thus switch T2.The ON-OFF control circuit of Q1 is made up of darlington array pipe U2 and resistance R 11, R12, by receiving the timing control signal CON2 of excitation timing sequence generating circuit, be translated into the homophase timing control signal CON3 of high level VDD, and then the break-make of control Q1, realize interlock control with T2.The ON-OFF control circuit of Q2 is made up of darlington array pipe U2 and resistance R 9, R10, by accepting the timing control signal CON1 of excitation timing sequence generating circuit, be translated into the homophase timing control signal CON4 of high level VDD, and then the break-make of control Q2, realize interlock control with T1.Darlington array pipe U2 receives the timing control signal CON1 and the CON2 of excitation timing sequence generating circuit.Zener diode Z1 plays the driving voltage amplitude limit effect of H bridge excitation power supply, and then guarantees H bridge operate as normal under inductive load (field coil), capacitor C 2 its fixed ampllitude filter actions.
Excitation timing sequence generating circuit 3 provides control timing signal CON1 and CON2 for exciting coil drive circuit, realizes single-frequency high frequency square wave excitation or double frequency square-wave excitation.Excitation timing sequence generating circuit physical circuit schematic diagram is made up of digital signal processor (DSP) chip U3, multi-way switch U4 and level match device U5, capacitor C 4, C5, C6 and resistance R 17, R18 as shown in Figure 3.Wherein, dsp chip U3 (TMS320F2812) is excitation control core.C4, C5, C6 are respectively the power supply decoupling capacitance of multi-way switch U4 and level match device U5.The input pin 7 (A6) of U5,8 (A7) pass through resistance R 17 respectively, R18 is drop-down.During system works, the high level of U3 output is 3.3V, and U3 sends enable signal CBT OEn earlier and enables U4.
When single-frequency high frequency excitation, the 53 pin GPIOB6-T3PWM_T3CMP of U3 send high-level control signal CE_SIG all the time.The 55 pin GPIOB7-T4PWM_T4CMP of the timer GP Timer4 control U3 of U3 send PWM ripple CE_DIR and input to U4 pin 1 (S), switch the passage of U4.When CE_DIR was low level, CE_SIG and CES1 connected, and make that the input pin 7 (A6) of U5 is a high level, and the input pin 8 (A7) of U5 is because the drop-down effect of R18 is the low level input; When CE_DIR was high level, CE_SIG and CES2 connected, and make that the input pin 8 (A7) of U5 is a high level, and the input pin 7 (A6) of U5 is because the drop-down effect of R17 is the low level input.Constantly switch according to this, then the output pin 14 (B6) of U5,13 (B7) change along with the saltus step of input pin 7 (A6), 8 (A7) height, produce single-frequency excitation timing control signal CON1, CON2.Single-frequency high frequency excitation timing control signal is shown in Fig. 4 (a).
When dual-frequency excitation, the 53 pin GPIOB6-T3PWM_T3CM of the timer GP Timer3 of U3 control U3 send PWM ripple CE_SIG, are connected to U4 pin 9 (3A); The 55 pin GPIOB7-T4PWM_T4CMP of the timer GP Timer4 control U3 of U3 send PWM ripple CE_DIR, are connected to U4 pin 1 (S), switch the passage of U4.When CE_DIR was low level, CE_SIG and CES1 connected, and make PWM ripple signal CE_SIG input to the input pin 7 (A6) of U5, and the pin 8 (A7) of U5 were because the drop-down effect of R18 is the low level input; When CE_DIR was high level, CE_SIG and CES2 connected, and make PWM ripple signal CE_SIG input to the input pin 8 (A7) of U5, and the pin 7 (A6) of U5 is because the drop-down effect of R17 is the low level input.Constantly switch according to this, make the output pin 14 (B6) of U5,13 (B7) change, produce dual-frequency excitation timing control signal CON1, CON2 along with the height saltus step of input pin 7 (A6), 8 (A7).The dual-frequency excitation timing control signal is shown in Fig. 4 (b).
Figure 4 shows that excitation timing sequence generating circuit excitation timing control signal figure.In conjunction with Fig. 2, when linear power supply supply voltage VCC was enough high, exciting current can enter stable state in excitation in the semiperiod, and the exciting current loop is as follows:
Single-frequency high frequency excitation: when entering the excitation stable state during S1, current return is metal-oxide-semiconductor among triode among constant current source → T1 → field coil L1 → Q2 → inspection leakage resistance R2 → reference ground; S1 switches to before direction of current does not change in the field coil behind the S2, and current return is to protect among field coil L1 → T2 among diode → Zener diode Z1 → reference ground → inspection leakage resistance R2 → Q1 to protect diode → field coil L1; After direction of current had changed in the field coil during S2, current return was metal-oxide-semiconductor among triode among constant current source → T2 → field coil L1 → Q1 → inspection leakage resistance R2 → reference ground; S2 switches to before direction of current does not change in the field coil behind the S3, and current return is to protect among field coil L1 → T1 among diode → Zener diode Z1 → reference ground → inspection leakage resistance R2 → Q2 to protect diode → field coil L1; Direction of current has changed the back with entering the excitation stable state during the S1 in the field coil during S3; Move in circles.
Dual-frequency excitation: during the H2, current return is metal-oxide-semiconductor among triode among constant current source → T1 → field coil L1 → Q2 → inspection leakage resistance R2 → reference ground; During the H3, current return is to protect among field coil L1 → T2 among diode → Zener diode Z1 → reference ground → inspection leakage resistance R2 → Q1 to protect diode → field coil L1; During the H4 with during the H2; Move in circles; During the H10, current return is metal-oxide-semiconductor among triode among constant current source → T2 → field coil L1 → Q1 → inspection leakage resistance R2 → reference ground; During the H11, current return is to protect among field coil L1 → T1 among diode → Zener diode Z1 → reference ground → inspection leakage resistance R2 → Q2 to protect diode → field coil L1; Move in circles.
As above-mentioned current return, metal-oxide-semiconductor Q1, Q2 grid current can be ignored, and exciting current all can accurately detect by tested leakage resistance R2 in during any excitation.
Figure 5 shows that the electromagnetic flow meter excitation control system specific embodiment schematic diagram of belt current bypass circuit.Identical among circuit 1,2,3,4 parts and Fig. 2; Circuit 5 is the current bypass circuit, is made up of triode T5, T6, T7, T8, resistance R 13, R14, R15 and adjustable resistance R16, capacitor C 3.The effect of current bypass circuit 5 is as follows:
Unique path of exciting current among Fig. 2 all being walked linear power supply U1 process is divided into a shown in Figure 5, b, c three tunnel.T7 and R13 decision a road electric current account for the proportion of total exciting current; T5, T6, R14 decision b road electric current account for total exciting current proportion, and then have determined c road electric current to account for the proportion of total exciting current; Voltage accounts for the proportion of the difference of input voltage VCC and constant current source output voltage between the collection emitter-base bandgap grading of R15 and R16 decision T5, T6, T7, T8, and then determines its power consumption size.When excitation was switched, C3 carried out smothing filtering to the R14 both end voltage.This current bypass circuit can be controlled a, b, c three tunnel size of current and the power consumption of U1 in triode T5, T6, T7, T8 and the constant-current source circuit wherein respectively, can effectively alleviate the heating problem of U1 when the high frequency excitation needs high voltage source (VCC) to power.
Claims (6)
1. list/dual frequency electromagnetic flowmeter excitation control system based on linear power supply, be used for providing exciting current to field coil, thereby provide the magnetic field of cycle variation to detected fluid, comprise constant-current source circuit, current bypass circuit, exciting coil drive circuit, excitation timing sequence generating circuit, galvanometer circuit, it is characterized in that:
The power supply of employing high voltage source, constant-current source circuit is built to exciting coil drive circuit by linear power supply and is powered, the current bypass circuit is connected to the linear power supply input/output terminal to solve the energy dissipation problem, exciting coil drive circuit is made up of H bridge and control circuit thereof, galvanometer circuit is connected across H bridge low side and with reference between the ground, the excitation timing sequence generating circuit is by being used for the digital signal processor cooperation multi-way switch generation sequential that flow signal is handled, the action of control exciting coil drive circuit.
2. electromagnetic flow meter excitation control system as claimed in claim 1 is characterized in that: constant-current source circuit is made up of linear power supply U1 and resistance R 1, wherein the size of resistance R 1 decision constant current source output current.
3. electromagnetic flow meter excitation control system as claimed in claim 1, it is characterized in that: the current bypass circuit is made up of triode T5, T6, T7, T8, resistance R 13, R14, R15 and adjustable resistance R16, capacitor C 3, wherein each triode power consumption and by-pass current size all can be passed through resistance R 14, R15, R16 regulate, and the size of current of U1 in the constant-current source circuit is flow through in resistance R 13 decisions.
4. electromagnetic flow meter excitation control system as claimed in claim 1 is characterized in that: the H bridge is high-end in the exciting coil drive circuit is made up of current control device PNP triode T1 and T2, and low side is made up of voltage control device N-channel MOS pipe Q1 and Q2; It is all anti-and protect diode that the collection interpolar is penetrated in triode T1, T2 inside, and the inner drain-source interpolar of N-channel MOS pipe Q1, Q2 is all anti-and protect diode; Control circuit is made up of darlington array pipe U2, triode T3, T4 and resistance R 3, R4, R5, R6, R7, R8, R9, R10, R11, R12.
5. electromagnetic flow meter excitation control system as claimed in claim 1, it is characterized in that: galvanometer circuit is made up of resistance R 2, resistance R 2 is connected across H bridge low side and with reference between the ground, form mode according to H bridge diagonal angle interlock control mode and H bridge, its both end voltage can more accurately reflect the size of current in each excitation stage in the field coil.
6. electromagnetic flow meter excitation control system as claimed in claim 1 is characterized in that: the excitation timing sequence generating circuit is by core control part DSP chip U3, and multi-way switch chip U4 and level match device U5 form; Go up peripheral hardware by DSP chip U3 and send excitation control signal, produce the excitation sequential in conjunction with multi-way switch, the line level of going forward side by side coupling realizes list/dual-frequency excitation, need not software program control in the excitation process, thereby improves the precision of excitation frequency; The 45th pin of DSP chip U3, the 53rd pin, the 55th pin are connected with multi-way switch chip U4 the 15th pin, the 9th pin, the 1st pin respectively; The 11st pin of multi-way switch chip U4, the 10th pin are connected with the 7th pin, the 8th pin of level match device U5 respectively; The 14th pin of level match device U5, the 13rd pin be output timing control signal CON1 respectively, CON2.
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