CN105301153B - Liquid chromatograph and its control method with gradient valve controling circuit - Google Patents
Liquid chromatograph and its control method with gradient valve controling circuit Download PDFInfo
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- CN105301153B CN105301153B CN201410277806.5A CN201410277806A CN105301153B CN 105301153 B CN105301153 B CN 105301153B CN 201410277806 A CN201410277806 A CN 201410277806A CN 105301153 B CN105301153 B CN 105301153B
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Abstract
The invention discloses a kind of liquid chromatograph and its control method with gradient valve controling circuit, including N member gradient valve and gradient valve controling circuit, N member gradient valve has N number of solenoid valve, gradient valve controling circuit is used to control the opening and closing of N number of solenoid valve, an adjusting circuit is connected between gradient valve controling circuit and at least one solenoid valve, adjusting circuit includes a mos pipe, one discharge resistance and a backward dioded, the output end of gradient valve controling circuit and the first voltage input terminal of solenoid valve connect, the grid of mos pipe and the first voltage input terminal of solenoid valve connect, the drain electrode of mos pipe and the second voltage input terminal of solenoid valve connect, the source electrode of mos pipe is connected to ground, discharge resistance is connected in parallel between the drain electrode and source electrode of mos pipe, backward dioded is connected to the first electricity of solenoid valve It presses between input terminal and ground.Liquid chromatograph of the present invention can reduce the opening and closing time of solenoid valve, keep mobile phase mixed proportion more accurate.
Description
Technical field
The present invention relates to chemical analysis fields, in particular to the liquid chromatograph with gradient valve controling circuit and its control
Method.
Background technique
High performance liquid chromatography is a chromatographic important branch, is using liquid as mobile phase, using high pressure infuser
The mobile phases such as mixed solvent, the buffer of single solvent or different proportion with opposed polarity are pumped into equipped with fixing by system
The chromatographic column of phase is detected after each ingredient of sample is separated in chromatographic column into detector, to realize to sample
The qualitative and quantitative analysis of product.This method has become important in the ambits such as chemistry, medicine, industry, agronomy, commodity inspection and method inspection
Separate analytical technique.High performance liquid chromatograph (HPLC) is the instrument for this analysis method.
Infusion pump in high performance liquid chromatograph is mainly used for for one or more mobile phases being injected into system, infusion pump
It is mainly connected and is formed with plunger pump in series by polynary gradient valve, polynary gradient valve has multiple solenoid valves, each solenoid valve difference
For receiving a kind of mobile phase, after the public passage for then passing through gradient valve, into plunger pump in series.Solenoid valve divides after powered up
The opening and closing of fluid path are not corresponded to for realizing it.When solenoid valve Inside coil is powered, the iron core of valve inner is in electromagnetism
The active force for restoring spring is overcome under the action of power, is moved, thus the fluid path channel blocked at the front position opened, liquid
Body flows through the channel, and from the common end of gradient valve, outflow enters chromatograph system；Power-off when, solenoid valve Inside coil by
In losing electromagnetic force, spring force can not be overcome, to seal the channel and public passage by springback to initial position
Fluid path connection, the channel close.
In high performance liquid chromatograph, the effect of polynary gradient valve is that distribution multichannel is gone according to mixed proportion set by user
Mobile phase liquid, and whether mixed flow phase accurately is gone by the mixed proportion of setting, it is an important factor for influencing test result.
Due to the reasons in structure of solenoid valve, have certain response time (specific when each solenoid valve opens and closes
Delay time is related to the mechanical structure of solenoid valve), it is the current curve during electromagnetic valve work, (1) with reference to Fig. 1
Ab sections: solenoid valve is initially powered up, and after electromagnetic valve coil is passed through electric current, since coil is there are inductance, the counter electromotive force of generation hinders
Hinder electric current in coil to increase, prevents it from being rapidly reached steady-state value；The electromagnetic force that the electric current generates is not enough to overcome suffered by spool
The resistance of motion (damping spring, stiction), spool is not turned on.(2) bc sections: after coil current increases to b point, electromagnetism
Power overcomes the resistance of motion suffered by spool (damping spring, stiction), spool setting in motion, anti-electronic due to coil at this time
Gesture effect, the electric current of coil become smaller instead at this time, and electric power reduces simultaneously.But resistance also becomes smaller therewith.(3) cd sections.This rank
Section spool reaches maximum position, and since spool is motionless at this time, the inductance of coil is constant, so electric current rises again, it with it is previous
There are an intersection point (c points) for stage current curve, at the time of this point is exactly that spool reaches exactly to maximum open position.(4) ef sections:
Solenoid valve power-off, applied voltage is 0V after power-off, and due to the effect of electromagnetic valve coil inductance, electric current will not be mutated, remaining electricity
Stream closes spool slowly.As it can be seen that ac sections and ef sections are response time of the solenoid valve when opening and closing respectively, and liquid
Flow is directly proportional to the opening time of solenoid valve, so the response time will lead to more greatly fluid flow and exceed standard volume more
It is more, so that the amount of liquid inaccuracy of each channel transfer, and then lead to mixed liquid fraction inaccuracy, finally influence liquid phase
Chromatographic measurement result.
In conclusion the solenoid valve lacked in a kind of gradient valve in the prior art is enable to respond quickly in beginning and closing
Liquid chromatograph.
Summary of the invention
In order to solve the problems in the existing technology, solenoid valve in gradient valve can be improved the invention proposes one kind to ring
Answer the liquid chromatograph of speed.
The invention proposes a kind of liquid chromatographs with gradient valve controling circuit, including N member gradient valve and gradient valve
Control circuit, N >=2, the N member gradient valve have N number of solenoid valve, and the gradient valve controling circuit is for controlling N number of solenoid valve
Opening and closing, an adjusting circuit, institute are connected between the gradient valve controling circuit and at least one described solenoid valve
Stating and adjusting circuit includes a mos pipe, a discharge resistance and a backward dioded, the output of the gradient valve controling circuit
End is connect with the first voltage input terminal of the solenoid valve, and the grid of the mos pipe and the first voltage of the solenoid valve input
End connection, the drain electrode of the mos pipe are connect with the second voltage input terminal of the solenoid valve, and the source electrode and ground of the mos pipe are even
It connects, the discharge resistance is connected in parallel between the drain electrode and source electrode of mos pipe, the cathode of the backward dioded and the electromagnetism
The first voltage input terminal of valve connects, and the anode of the backward dioded is connected to ground.
In liquid chromatograph of the present invention, the of the output end of the gradient valve controling circuit and the solenoid valve
A reverse current protection diode, anode and the gradient valve of the counter-current diode can also be connected between one voltage input end
The output end of control circuit connects, and the cathode of the counter-current diode is connect with the first voltage input terminal of the solenoid valve.
In liquid chromatograph of the present invention, the grid of the first voltage input terminal of the solenoid valve and the mos pipe
A capacitor can also be connected between pole.
In liquid chromatograph of the present invention, a resistance is connected between the grid and ground of the mos pipe.
In liquid chromatograph of the present invention, it is connected with a light emitting diode between the drain electrode and source electrode of mos pipe,
The light emitting diode and the discharge resistance are connected in series, and the cathode of the light emitting diode passes through the electric discharge
Resistance is connect with the drain electrode of the mos pipe, and the anode of the light emitting diode is connect with the source electrode of the mos pipe.
Any in liquid chromatograph of the present invention, in the gradient valve controling circuit and N number of solenoid valve
An adjusting circuit is respectively connected between solenoid valve.
The invention also provides a kind of control methods for above-mentioned liquid chromatograph, comprising the following steps: the ladder
Bottom valve control circuit generates a d. c. voltage signal, and the voltage value of the d. c. voltage signal is greater than the specified electricity of the solenoid valve
Pressure, the solenoid valve enter open state according to the d. c. voltage signal；The gradient valve controling circuit generates a pulsewidth
Modulated signal, the solenoid valve are kept it turned on according to the pulse-modulated signal；The gradient valve controling circuit stops
Output signal, the solenoid valve enter closed state.
Compared with prior art, liquid chromatograph of the present invention shortens electricity by improving the driving voltage of solenoid valve
The unlatching response time of magnet valve；The unlatching that solenoid valve is controlled by way of PWM (pulsewidth modulation) keeps process, not only reduces
The power loss of coil, improves the service life of coil, and due to the effect of PWM, and the electric current on coil gradually decreases, in electromagnetism
When closing, the electric current on coil is smaller, can respond closing motion quickly, when reducing response when solenoid valve is closed
Between；And also shorten discharge time, to accelerate the closing response time of solenoid valve by adjusting the size of discharge resistance；And
And the high pressure inverse electromotive force for going offline and enclosing and generating during the shutdown process of also being released by backward dioded, it is anti-electronic to avoid high pressure
Gesture is adversely affected caused by system.
Detailed description of the invention
Fig. 1 is the current curve of solenoid valve during the work time in the prior art.
Fig. 2 is the structural schematic diagram of the high performance liquid chromatograph 2 in the embodiment of the present invention.
Fig. 3 is the structural schematic diagram of infusion pump 202 in the embodiment of the present invention.
Fig. 4 is a kind of structural schematic diagram of the adjusting circuit 208 in the embodiment of the present invention.
Fig. 5 is solenoid-driven voltage and current change curve in the embodiment of the present invention.
Fig. 6 is another structural schematic diagram that circuit 208 is adjusted in the embodiment of the present invention.
Specific embodiment
Presently preferred embodiments of the present invention is introduced with reference to the accompanying drawing.
With reference to Fig. 2, in the present embodiment, high performance liquid chromatograph 2 include solution organizer 201, quaternary infusion pump 202,
Sample injector 203, chromatographic column 204, detector 205, information processing system 206, gradient valve controling circuit 207 and adjusting circuit 208,
Solution in solution organizer 201 is injected into chromatographic system as mobile phase by infusion pump 202, sample after degassing
Product solution injects mobile phase by sample injector 203, and is loaded into chromatographic column 204 (stationary phase) by mobile phase, since sample is molten
Each component in liquid has different polarity from chromatographic column, when sample solution makees relative motion in chromatographic column 204, by repeatedly
The assigning process of multiple absorption-desorption, each component generate biggish difference in movement speed, are finally separated into single group
Divide and be successively precipitated out of chromatographic column 204, the ingredient of precipitation passes through monochromatic projection, and detector 205 detects the change of luminous intensity
Change, and these optical signals are converted into electric signal and are transmitted in information processing system 206, information processing system 206 is to receiving
Electric signal analyzed, then will analysis result shown in the form of map.
As an example, information processing system 106 can be the equipment for having information processing capability by computer etc.
It realizes.
As an example, infusion pump 202 can be the polynary infusion pump such as binary pump, quaternary pump.
With reference to Fig. 3, in the present embodiment, quaternary infusion pump 202 is mainly by quaternary gradient valve 2021 and plunger pump in series
2022 connect and compose, and quaternary gradient valve 2022 has tetra- solenoid valves of A, B, C, D, and each solenoid valve constitutes an infusion channel,
A kind of mobile phase is used for transmission to the public passage of gradient valve 2021, four solenoid valves alternately connect with public passage, led to
Mobile phase in road is transported in plunger pump in series 2022, and plunger pump in series 2022 exports after mixing a variety of flowings.Gradient
Valve controling circuit 207 sequentially controls the opening and closing of each solenoid valve according to mobile phase mixed proportion, by controlling solenoid valve
The unlatching retention time, control the fluid flow of the infusion channel.
As an example, gradient valve controling circuit 207 can be made of DSP and driving circuit, and driving circuit can be by
The driving chips such as L293DD are constituted.
In order to solve the problems, such as that solenoid valve is when opening and closing there are the response time in the prior art, the present invention is in gradient
An adjusting circuit 208 is increased between valve controling circuit and solenoid valve, for the unlatching response time of electromagnetic valve for adjusting and pass
Close the response time.
In the present embodiment, an adjusting is connected separately between gradient valve controling circuit 207 and A, B, C, D solenoid valve
Circuit 208 is respectively used to adjust the unlatching response time of four solenoid valves and close the response time.With reference to Fig. 4, in the present embodiment
In, adjusting circuit 208 includes 2081, discharge resistances 2082 of a mos pipe and a backward dioded 2083, gradient valve control
The output end 2084 of circuit 207 processed is connect with the first voltage input terminal 2085 of solenoid valve, the grid and solenoid valve of mos pipe 2081
First voltage input terminal 2085 connect, the second voltage input terminal 2086 of the drain electrode of mos pipe 2081 and solenoid valve connects, mos
The source electrode of pipe 2081 is connected to ground, and discharge resistance 2082 is connected between the drain electrode and source electrode of mos pipe 2081, backward dioded
2083 cathode and the first voltage input terminal 2085 of solenoid valve connect, and the anode of backward dioded 2083 is connected to ground.
In the present embodiment, the control terminal of the control circuit in gradient valve controling circuit 207 issues enable signal, and control is driven
Dynamic circuit output voltage signal, drive magnetic valve work.
It is the driving voltage change curve of solenoid valve with reference to Fig. 5.5 introduce gradient valve controling circuit with reference to the accompanying drawing
The course of work of 207 drive magnetic valves.
1) solenoid valve enters open state
The output end 2084 of gradient valve controling circuit 207 generates a d. c. voltage signal, the amplitude of the d. c. voltage signal
Greater than the voltage rating of solenoid valve, solenoid valve enters open state according to the d. c. voltage signal.After solenoid valves, adjust
Circuit 208 enters over-voltage open state, and DC voltage opens metal-oxide-semiconductor 2081, and the link circuit of solenoid valve only has metal-oxide-semiconductor at this time
2081 accesses are connected to ground, and solenoid valve is opened under big voltage, and continues for some time (ad of times in Fig. 5), this section
In time, the electric current in solenoid valve is gradually increased, and fully opens solenoid valve.Using the direct current for being greater than solenoid valve voltage rating
Press signal, it is therefore an objective to make solenoid valve under the driving of big voltage, the current changing rate in coil increases, and coil can be made quick in this way
Charging generates electromagnetic force, quickly opens valve body, therefore shortens and open response time (ac of times in Fig. 5).It is straight in selection
It when galvanic electricity presses duration (ad sections), should guarantee that solenoid valve fully opens, and solenoid valve will not be made to be in high for a long time
Pressure condition had needed to meet simultaneously not only quickly unlatching, but also the condition in solenoid valve service life will not be lost, in the feelings for meeting above-mentioned requirements
Under condition, the size of DC voltage duration can carry out flexible setting.
As an example, the amplitude of d. c. voltage signal can according to need flexible selection, and value range can be in electricity
In the range of the load voltage value of magnet valve to the maximum supply voltage of driving circuit.
2) solenoid valve is kept it turned on
After solenoid valve fully opens, it can enter and keep it turned on, at this time the output end of gradient valve controling circuit 207
2084 generate a PWM (pulsewidth modulation) signal, and solenoid valve is kept it turned on according to the pwm signal.When the high level of pwm signal
When arrival, adjusting circuit 208, metal-oxide-semiconductor 2081 can be connected, and solenoid valve is in the open state at this time；It is low when pwm signal
When level arrives, discharge condition can be switched to by adjusting circuit 208, because metal-oxide-semiconductor 2081 can close automatically when low level
It closes, the circuit of solenoid valve is directly connected with discharge resistance 2082, and solenoid valve is in the state that do not power at this time, can only be consumed certainly
The energy that own coil saves, the energy on coil can discharge, at this point, the high level of pwm signal is come again, coil has in voltage
Under the action of again keep it turned on, so recycle always, the equivalent voltage on solenoid valve can be gradually reduced, and both keep solenoid valve
Open state, and reduce solenoid valve generation heat, the service life for the high-pressure loss valve body for avoiding valve body lasting.
In the present embodiment, the amplitude of pwm signal and the amplitude of d. c. voltage signal are equal, and the duty ratio of pwm signal can
To be adjusted according to the characteristic of specific valve body, such as can be according to the closing response time of the solenoid valve measured inherently
The duty ratio of pwm signal is set, and the duty ratio of the pwm signal by controlling each solenoid valve, control solenoid valve is being kept it turning on
The equivalent voltage of process, so that the closing response time of solenoid valve is controlled, so that one of each solenoid valve in same gradient valve
Cause property is more preferable.
3) solenoid valve enters closed state
After the completion of solenoid valve infusion, into closed state, gradient valve controling circuit 207 stops outputting drive voltage signal.
Discharge loop can be automatically switched to by adjusting circuit 208 at this time, and metal-oxide-semiconductor 2081 can be automatically closed, and the circuit of solenoid valve is direct and puts
Resistance 2082 connects, and allows the coil of solenoid valve to rapidly deplete its energy by discharge resistance 2082, reaches the mesh of repid discharge
, so that the closing response time (the ef section in Fig. 5) of solenoid valve becomes smaller.Assuming that L is the equivalent inductance value of electromagnetic valve coil, R
It is the resistance value of discharge resistance 2082, the discharge time constant t=L/R of coil, the size by adjusting discharge resistance 2082 can be with
Adjust the discharge time of electric coil.Since the moment closed in solenoid valve can generate reverse induction electromotive force, adjust in circuit 208
2083 pairs of backward dioded release, avoid its generate instantaneous pressure electric arc damage device.
To sum up, liquid chromatograph of the invention is given when solenoid valve enters open state by adjusting circuit 208
Solenoid valve inputs the high pressure of moment, and solenoid valve is made to shorten electricity compared with prior art in very short time quick and complete unlatching
The unlatching response time of magnet valve.
When solenoid valve is in and keeps it turned on, solenoid valve is controlled using pwm signal, passes through the height of pwm signal
Level and low level toggle solenoid valve between opening and closing, effectively reduce and are added in two sections of solenoid valve equivalent
Voltage avoids lasting high pressure and makes coil heating, the service life of valve body is lost；In addition, if the voltage and current on coil is got over
Greatly, for solenoid valve when closing, the time needed is longer, and voltage and current added on coil is bigger, is closing electromagnetism
The reverse induction electromotive force that valve moment generates is bigger, can hinder the quick variation of electric current in coil, also can extend the shut-in time,
So on coil equivalent voltage and current reduction, also lay a good groundwork for quick closedown solenoid valve below.
When solenoid valve enters closed state, since front keeps it turning on the good place mat that the stage does, add
The acceleration of discharge resistance 2082 is discharged, and the discharge time of solenoid valve is further shortened.
As another preferred embodiment of circuit 208 is adjusted in the present embodiment, as shown in fig. 6, adjusting in circuit 208
Further include a reverse current protection diode 601, be connected to gradient valve controling circuit 207 output end 2084 and solenoid valve the
Between one voltage input end 2085, the anode of counter-current diode 601 is connect with the output end 2084 of gradient valve controling circuit, adverse current
The cathode of diode 601 and the first voltage input terminal 2085 of solenoid valve connect, and in the present embodiment, counter-current diode 601 is used
In the adverse effect that the backward current for preventing solenoid valve from generating generates gradient valve controling circuit 207, to gradient valve controling circuit
207 play a protective role.
As another preferred embodiment for adjusting circuit 208 in the present embodiment, adjusting in circuit 208 further includes one
Capacitor 602 is connected between the first voltage input terminal 2085 of solenoid valve and the grid of mos pipe 2081, in the present embodiment, is led to
The size of capacitor 602 is overregulated, mos pipe 2081 can be made to open faster.
Further, adjusting in circuit 208 further includes a resistance 603, be connected to the grid of mos pipe 2081 with ground it
Between, in the present embodiment, resistance 603 is mainly used for dischargeing the charge accumulated on capacitor 602, when avoiding long due to solenoid valve
Between be in high pressure conditions, accumulate a large amount of charge on capacitor 602, damaged caused by other devices.Also, if circuit occurs
Failure, cannot generate pwm signal reduces equivalent voltage, and the resistance-capacitance network that capacitor 602 and resistance 603 form can be by voltage slowly
It reduces, avoids since long-time is in high pressure conditions damage caused by valve body.
As another preferred embodiment for adjusting circuit 208 in the present embodiment, adjusting in circuit 208 further includes one
Light emitting diode 605 is connected between the drain electrode and source electrode of mos pipe 2081, and light emitting diode 605 is connected with discharge resistance 2082
The cathode of connection, light emitting diode 605 is connect by discharge resistance 2082 with the drain electrode of mos pipe 2081, light emitting diode 605
Anode is connect with the source electrode of mos pipe 2081.In the present embodiment, light emitting diode 605 is used to detect the working condition of solenoid valve,
Suggesting effect is played, for example, the light emitting diode of solenoid valve A is bright, indicates that solenoid valve A is working, the light-emitting diodes of solenoid valve B
Pipe does not work, and indicates that solenoid valve B does not work.
As the another kind for adjusting circuit 208 in the present embodiment for example, adjusting the discharge resistance 2082 in circuit 208
It can be made of, can also be constituted by multiple resistance are in series or in parallel a resistance.
Illustrate as an example, it can be according to the design needs between gradient valve controling circuit 208 and any one solenoid valve
Selection connection is not connected to adjust circuit 208, and the solenoid valve that connection adjusts circuit 208 can use method of the present invention
The opening and closing response time of solenoid valve is adjusted, the solenoid valve for not connecting adjusting circuit 208 can not be corresponding
It adjusts.
The present inventor passes through internal structure, driving principle and the switch motion feature of further investigation gradient valve,
On the basis of a large amount of experiment and data, the movement of the solenoid valve in gradient valve is divided into three by binding isotherm qualitative and quantitative analysis
A stage goes to be analyzed.Solenoid valve open stage quickly increases coil current using moment over-voltage, it is made quickly to generate electricity
Magnetic force attracts iron core to open valve body；Solenoid valve keeps it turning on the stage, in the way of PWM, reduces coil voltage electric current, reduces
The power loss of coil reduces the heat of generation, and lays the groundwork for solenoid valve closing；Solenoid valve closed stage, in power down moment,
Circuit be switched to discharge resistance 2082 that all the way, the energy on coil is consumed at once, reduces the shut-in time of solenoid valve.
And the present invention also create it is below the utility model has the advantages that
1, it reduces the unlatching response time of solenoid valve and closes the response time, solenoid valve, which is opened the response time and closed, to be rung
It is all concentrated in a lesser time range between seasonable, the gradient valve and same gradient valve for effectively reducing different batches are not
With the otherness between solenoid valve.
2, the speed of response of gradient valve is improved.The flow inaccuracy via the mobile phase of valve channel is reduced to measurement
As a result influence.
3, it when solenoid valve is opened, by moment over-voltage, not only ensure that electromagnetism fully opened, but also effectively reduced for a long time
Big voltage and current be lost caused by valve body.And the response time is opened due to reducing, then reduces adjacent valve channel
Between when switch, the length of the vacuum time of generation.Vacuum time refers to that a channel in gradient valve is just closed, but
When another channel is opened not yet, the pump housing of plunger pump in series is still moved this moment, just has imbibition drain phenomenon,
Cause to generate value of the rebound phenomena to influence pressure.
Claims (7)
1. a kind of liquid chromatograph with gradient valve controling circuit, including N member gradient valve and gradient valve controling circuit, N >=2,
The N member gradient valve has N number of solenoid valve,
The gradient valve controling circuit is used to control the opening and closing of N number of solenoid valve,
It is characterized in that,
An adjusting circuit is connected between the gradient valve controling circuit and at least one solenoid valve,
The adjusting circuit includes a mos pipe, a discharge resistance and a backward dioded,
The output end of the gradient valve controling circuit is connect with the first voltage input terminal of the solenoid valve,
The grid of the mos pipe is connect with the first voltage input terminal of the solenoid valve, the drain electrode of the mos pipe and the electromagnetism
The second voltage input terminal of valve connects, and the source electrode of the mos pipe is connected to ground,
The discharge resistance is connected between the drain electrode and source electrode of mos pipe,
The cathode of the backward dioded is connect with the first voltage input terminal of the solenoid valve, and the backward dioded is just
Pole is connected to ground；
The course of work of the gradient valve controling circuit, specifically includes:
The gradient valve controling circuit exports d. c. voltage signal, and the amplitude of the d. c. voltage signal is greater than the solenoid valve
Voltage rating makes the solenoid valve enter open state；
After the solenoid valve enters open state, the adjusting circuit enters over-voltage open state, and DC voltage breaks mos pipe
It opens, the solenoid valve fully opens；
After the solenoid valve fully opens, into keeping it turned on, the gradient valve controling circuit output pulse width modulation is believed
Number, the solenoid valve is kept it turned on according to pulse-width signal, the amplitude of the pulse-width signal and the gradient valve
The amplitude of the d. c. voltage signal of control circuit is equal, and the duty ratio of the pulse-width signal is according to the characteristic of the solenoid valve
It adjusts；
After solenoid valve infusion is completed to enter closed state, the gradient valve controling circuit stops output voltage signal.
2. liquid chromatograph according to claim 1, which is characterized in that the output end of the gradient valve controling circuit and institute
State and be connected with a reverse current protection diode between the first voltage input terminal of solenoid valve, the counter-current diode anode with it is described
The output end of gradient valve controling circuit connects, and the first voltage input terminal of the cathode of the counter-current diode and the solenoid valve connects
It connects.
3. liquid chromatograph according to claim 1, which is characterized in that the first voltage input terminal of the solenoid valve and institute
It states and is connected with a capacitor between the grid of mos pipe.
4. liquid chromatograph according to claim 3, which is characterized in that be connected between the grid and ground of the mos pipe
One resistance.
5. liquid chromatograph according to claim 1, which is characterized in that be connected between the drain electrode and source electrode of mos pipe
One light emitting diode, the light emitting diode and the discharge resistance are connected in series, the cathode of the light emitting diode
It is connect by the discharge resistance with the drain electrode of the mos pipe, the source electrode of the anode and the mos pipe of the light emitting diode
Connection.
6. according to claim 1 to liquid chromatograph described in any claim in 5, which is characterized in that the gradient valve control
An adjusting circuit is respectively connected between any solenoid valve in circuit processed and N number of solenoid valve.
7. a kind of control method for liquid chromatograph as claimed in claim 6, which comprises the following steps:
The gradient valve controling circuit generates a d. c. voltage signal, and the voltage value of the d. c. voltage signal is greater than the electromagnetism
The voltage rating of valve, the solenoid valve enter open state according to the d. c. voltage signal；
The gradient valve controling circuit generates a pulse-width signal, and the solenoid valve is kept according to the pulse-width signal
Open state；
The gradient valve controling circuit stops output signal, and the solenoid valve enters closed state.
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| CN109340435B (en) * | 2018-10-30 | 2020-04-07 | 成都珂睿科技有限公司 | High-precision error correction method for multi-element low-pressure gradient proportional solenoid valve |
| JP7156047B2 (en) * | 2019-01-16 | 2022-10-19 | 株式会社島津製作所 | Chromatography device and load switch circuit |
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| CN202611892U (en) * | 2012-06-07 | 2012-12-19 | 罗达莱克斯阀门(上海)有限公司 | Gas engine nozzle drive control circuit and gas engine adopting the same |
| CN102966452B (en) * | 2012-11-30 | 2015-06-10 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Electromagnetic valve driving device |
| CN103869029B (en) * | 2012-12-18 | 2017-11-28 | 北京普源精仪科技有限责任公司 | A kind of liquid chromatograph with reciprocating plunger pump in series |
-
2014
- 2014-06-20 CN CN201410277806.5A patent/CN105301153B/en active Active
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