CN104048711A - Electromagnetic field multi-level strength switching circuit and electromagnetic field multi-level strength switching calculation method - Google Patents
Electromagnetic field multi-level strength switching circuit and electromagnetic field multi-level strength switching calculation method Download PDFInfo
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Abstract
The invention relates to the technical field of electromagnetic flow meters, in particular to an electromagnetic field multi-level strength switching circuit. The electromagnetic field multi-level strength switching circuit comprises an electromagnetic coil and is characterized in that a power supply control end of the electromagnetic coil is provided with an electromagnetic field strength switching unit, and the electromagnetic field strength switching unit comprises a DCDC voltage control constant current source circuit, a DCDC switching power supply circuit and a sample resistor switching circuit; the output current of the DCDC voltage control constant current source circuit is switched by changing the magnitude of sample resistors of a DCDC voltage control constant current source, and therefore electromagnetic field strength is switched; each sample resistor in the sample resistor switching circuit has access to a sampling circuit through control over an electromagnetic relay. The electromagnetic field multi-level strength switching circuit has the advantages that circuit efficiency is high, overall power consumption is lowered, and measuring accuracy and stability of an electromagnetic flow meter in small flow are improved.
Description
Technical field
The present invention relates to electromagnetic flowmeter technical field, specifically a kind of for strengthening the multistage intensity commutation circuit of digital control electromagnetic field of measuring accuracy that electromagnetic flowmeter at low discharge is and stability and switching computing method.
Background technology
Electromagnetic Flow detection technique is from being born till now, be widely used in the flow detection environment such as medical potable water, because being hydro jet magnetic field, electromagnetic flowmeter produces electromotive force, along with flow velocity increases, the electromotive force producing is stronger, but in the time of low discharge a little less than electromotive force induction, therefore need to increase excitation intensity so that induction electromotive force bring up to can sensing range.
At present, the solenoid input power in traditional electrical magnetic flowmeter is constant voltage, has caused when Coil resistance difference (sensors of different bores), as has realized multiple magnetic field intensity switching, and power-efficient is very low, can produce a large amount of losses.
And, because constant electromagnetic field formula is: B=μ n Ι, the μ in formula is the magnetic permeability in vacuum, n is coil turn, and I is electric current, this shows, the solenoid number of turn of sensor is fixed value, and liquid magnetic conductance is also fixed value, and magnetic field intensity is only current related with I.
Therefore, design a kind of adjustable circuit in magnetic field of exporting and become the key that detects primary flow signal.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art, a kind of circuit efficiency, reduction overall power, the enhancing electromagnetic flowmeter measuring accuracy in the time of low discharge and the multistage intensity commutation circuit of digital control electromagnetic field and switching computing method thereof of stability of improving are provided.
The technical solution adopted for the present invention to solve the technical problems is:
The multistage intensity commutation circuit of a kind of electromagnetic field, be provided with solenoid, the power control terminal that it is characterized in that described solenoid is provided with electromagnetic intensity switch unit, and it comprises DCDC controlled constant-current source circuit, DCDC switching power circuit, voltage follower and sampling resistor commutation circuit
Wherein,
Described DCDC controlled constant-current source circuit is made up of transistor Q5, amplifier U4, resistance R 9, chip U5, resistance R 10 and anti-interference capacitor C7, the reference voltage chip that described chip U5 is 1.2V, described chip U5 is in parallel with filter capacitor C7 carries out filtering to output voltage, described chip U5+12V is chip U5 power supply by resistance R 10, be connected to the 3rd pin of U4, form reference source, therefore the 3rd pin voltage of U4 is 1.2V; 1,8,5 pin of amplifier U4 are unsettled, in the time that sampling resistor commutation circuit is stablized, sampled voltage on sampling resistor is input to the 2nd pin of amplifier U4 by resistance R 9, and control the duty of transistor Q5 by resistance R 11 at the voltage of the 6th pin stable output, ensure to be constant by the electric current of electromagnetic relay
Described DCDC switching power circuit is made up of DCDC chip U3, electric capacity E1, diode D4, inductor L1, capacitor C 4, electric capacity E2, and power supply Vin is input to input voltage filtering by filter capacitor E1 the 1st pin of chip U3, is DCDC chip U3 power supply; The 3rd pin of U3, the 5th pin ground connection GnD respectively; Diode D4, inductor L1, capacitor C 4, electric capacity E2 forms current rectifying and wave filtering circuit, the 1st pin of the negative pole of diode D4 and inductor is connected to output the 2nd pin of chip U3, the 2nd pin of inductor L1, the 1st pin of capacitor C 4, the 1st pin of E2 is connected to VCC, and by Voltage-output, to electromagnetic relay circuit, the crus secunda of the positive pole of diode D4, the crus secunda of capacitor C 4 and electric capacity E2 is connected to power supply ground;
Described sampling resistor commutation circuit comprises n group commutation circuit, every group of commutation circuit comprises relay, diode D n, triode Q n and employing resistance R n, make relay, diode D n, triode Q n and employing resistance R n form sampling resistor network, taking first group of commutation circuit as example, triode Q controls (front end can be the digital control circuits such as single-chip microcomputer) by the CON_n that is connected to the 1st pin, the ground of triode the 2nd pin ground connection, coil the 2nd pin that the 3rd pin connects electromagnetic relay RELAY n is connected, the 1st pin of electromagnetic relay RELAY n is connected to power supply+5V diode D1 as protecting diodes in parallel to the coil of electromagnetic relay REALY n, the negative pole of diode D2 is connected with the 1st pin of electromagnetic relay REALY n coil, the positive pole of diode D2 is connected with the 2nd pin of electromagnetic relay REALY n coil with the negative pole of diode D2, Chang Kaiduan the 4th pin of Chang Kaiduan the 4th pin of electromagnetic relay REALY n and the electromagnetic relay REALY n of other groups is connected to constant-current source circuit and switching power circuit provides sampled signal.Common port the 3rd pin of electromagnetic relay REALY n is connected with the 1st pin of sampling resistor R1, the 2nd pin ground connection of sampling resistor R1.When CON_ n is while being greater than the voltage of 0.7V when (Digital Logic is 1), triode Q1 conducting, electromagnetic relay REALY n starts working, and the 3rd pin of electromagnetic relay REALY n, the 4th pin closure, by sample circuit R1 access sampling resistor network.To reach the number that accesses the resistance of sampling resistor network by control, control the size of sampling resistor, and keep stable effect, realize the switching of the magnetic field intensity of electromagnetic relay generation.
The present invention can be provided with voltage follower circuit in DCDC switching power circuit, described voltage follower circuit is by chip U6B, resistance R 12, resistance R 13, capacitor C 8 forms, in the time that sampling resistor commutation circuit keeps stablizing, TP1 voltage stabilization, by resistance R 13, sampled voltage is input to the 5th pin of chip U6B, the first pin of filter capacitor C8 is connected with the 5th pin of chip U6B, to ensure the stable of sampled voltage, the U6B that power supply+12V ,-12V are chip powers, and is connected respectively to the 8th pin and the 4th pin of amplifier.The 6th pin of amplifier U6B is connected with the 1st pin, form voltage follower circuit, sampled voltage 1:1 is exported by the 7th pin, the 4th pin that is input to chip U3 by resistance R 12, for DCDC chip, U3 provides sampled voltage, in order to regulate the output of DCDC chip U3, why increase voltage follower circuit and be sampling precision in order to improve sampling resistor and the stability of sampled signal, circuital current is regulated more stable, the magnetic field that coil is produced is more stable
The multistage intensity of a kind of electromagnetic field is switched computing method, it is characterized in that being specifically calculated as follows:
Due to constant electromagnetic field formula: B=μ n Ι, (μ is the magnetic permeability in vacuum, n is coil turn, I is electric current), the cell winding number of turn is for fixing, liquid magnetic conductance is also for fixing, therefore, magnetic field intensity is only current related with I, switch DCDC controlled constant-current source circuit output current by the sampling resistor size that changes DCDC voltage controlled current source, thereby realize the switching of magnetic field intensity, each sampling resistor in sampling resistor commutation circuit accesses sample circuit by controlling electromagnetic relay, sampling resistor can be selected identical value as required, or different value, in the time selecting number of switches or path different, the voltage at sampling resistor circuit two ends is constant,
Be U5, R10, the voltage of the reference source circuit output of C7 composition, that is, and Vref;
Therefore
Work as A:R1=R2=... when=Rn=R, selecting the relay conducting of m road, the electric current obtaining is,
Iref=Vref/(R/m)
Drawn by formula, in the time that m is larger, output current is larger, and the magnetic field that is applied to coil generation is larger.
Work as B:R1, R2 ... when Rn is unequal, selecting the relay conducting of m road to show that electric current is
Iref=Vref/(Rm)
Drawn by formula, when Rm more hour, be applied to the magnetic field that coil produces larger,
Wherein n and m are not less than 2 integer,
In the time that circuit does not switch, circuit can keep fixing one group of sampling resistor state, and DCDC voltage controlled current source can be exported steady current.
The present invention, owing to adopting said structure and method, has high circuit efficiency, reduces overall power, strengthens the advantage such as measuring accuracy and stability of electromagnetic flowmeter in the time of low discharge.
brief description of the drawings
Fig. 1 is DCDC controlled constant-current source circuit of the present invention
Fig. 2 is for adopting resistance commutation circuit (only switching to example with 3 kinds of intensity magnetic field describes).
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described:
As shown in Figure 1, introduce the multistage intensity commutation circuit of a kind of electromagnetic field, it is provided with solenoid, the power control terminal that is characterised in that described solenoid is provided with electromagnetic intensity switch unit, it comprises DCDC controlled constant-current source circuit, DCDC switching power circuit, voltage follower and sampling resistor commutation circuit
Wherein,
Described DCDC controlled constant-current source circuit is made up of transistor Q5, amplifier U4, resistance R 9, chip U5, resistance R 10 and anti-interference capacitor C7, the reference voltage chip that described chip U5 is 1.2V, described chip U5 is in parallel with filter capacitor C7 carries out filtering to output voltage, described chip U5+12V is chip U5 power supply by resistance R 10, be connected to the 3rd pin of U4, form reference source, therefore the 3rd pin voltage of U4 is 1.2V; 1,8,5 pin of amplifier U4 are unsettled, in the time that sampling resistor commutation circuit is stablized, sampled voltage on sampling resistor is input to the 2nd pin of amplifier U4 by resistance R 9, and control the duty of transistor Q5 by resistance R 11 at the voltage of the 6th pin stable output, ensure to be constant by the electric current of electromagnetic relay.
Described DCDC switching power circuit is made up of DCDC chip U3, electric capacity E1, diode D4, inductor L1, capacitor C 4, electric capacity E2, and power supply Vin is input to input voltage filtering by filter capacitor E1 the 1st pin of chip U3, is DCDC chip U3 power supply; The 3rd pin of U3, the 5th pin ground connection GnD respectively; Diode D4, inductor L1, capacitor C 4, electric capacity E2 forms current rectifying and wave filtering circuit, the 1st pin of the negative pole of diode D4 and inductor is connected to output the 2nd pin of chip U3, the 2nd pin of inductor L1, the 1st pin of capacitor C 4, the 1st pin of E2 is connected to VCC, and by Voltage-output, to electromagnetic relay circuit, the crus secunda of the positive pole of diode D4, the crus secunda of capacitor C 4 and electric capacity E2 is connected to power supply ground; Voltage follower is by chip U6B, resistance R 12, resistance R 13, capacitor C 8 forms, in the time that sampling resistor commutation circuit keeps stablizing, the voltage stabilization of TP1, the 5th pin that by resistance R 13, sampled voltage is input to chip U6B, the first pin of filter capacitor C8 is connected with the 5th pin of chip U6B, ensures the stable of sampled voltage, the U6B that power supply+12V ,-12V are chip powers, and is connected respectively to the 8th pin and the 4th pin of amplifier.The 6th pin of amplifier U6B is connected with the 1st pin, form voltage follower circuit, by the 7th pin output of passing through of sampled voltage 1:1, be input to the 4th pin of chip U3 by resistance R 12, for DCDC chip, U3 provides sampled voltage, is sampling precision in order to improve sampling resistor and the stability of sampled signal in order to regulate the output of DCDC chip U3, why to increase voltage follower circuit, circuital current is regulated more stable, the magnetic field that coil is produced is more stable.
Described sampling resistor commutation circuit comprises n group commutation circuit, described n is greater than 1 natural number, every group of commutation circuit comprises relay, diode D n, triode Q n and employing resistance R n, so that relay, diode D n, triode Q n and employing resistance R n form sampling resistor network, taking first group of commutation circuit as example, triode Q controls (its front end can be the digital control circuits such as single-chip microcomputer) by the CON_1 that is connected to the 1st pin, the ground of triode the 2nd pin ground connection, coil the 2nd pin that the 3rd pin connects electromagnetic relay RELAY1 is connected, the 1st pin of electromagnetic relay RELAY1 is connected to power supply+5V diode D1 as protecting diodes in parallel to the coil of electromagnetic relay REALY1, the negative pole of diode D2 is connected with the 1st pin of electromagnetic relay REALY1 coil, the positive pole of diode D2 is connected with the negative pole of diode D2 and the 2nd pin of electromagnetic relay REALY1 coil, Chang Kaiduan the 4th pin of the electromagnetic relay REALYn of the Chang Kaiduan of electromagnetic relay REALY1 the 4th pin and other groups is connected to constant-current source circuit and switching power circuit provides sampled signal.The common port of electromagnetic relay REALY1 the 3rd pin is connected with the 1st pin of sampling resistor R1, the 2nd pin ground connection of sampling resistor R1.When CON_1 is while being greater than the voltage of 0.7V when (Digital Logic is 1), triode Q1 conducting, electromagnetic relay REALY1 starts working, and the 3rd pin of electromagnetic relay REALY1, the 4th pin closure, by sample circuit R1 access sampling resistor network.To reach the number that accesses the resistance of sampling resistor network by control, control the size of sampling resistor, and keep stable effect, realize the switching of the magnetic field intensity of electromagnetic relay generation.
(only switching to example with 3 kinds of intensity magnetic field describes) as shown in Figure 2, U3 is as the adjustable DCDC chip of output, for constant-current source circuit provides voltage, FB(4 pin) sampled voltage is 1.2V, when commutation circuit keeps not switching state, sampling resistor networking resistance is constant, and U3, by gathering the voltage on sampling resistor, regulates the dutycycle of internal switching signal, thereby the voltage of regulation output OUT (2 pin), make to act on the current constant on coil, and keep output electromagnetic field constant
Sampled voltage is:
U
fb: sampled voltage
R
fb: sampling resistor network resistance
R
f: Coil resistance
Because U3 internal reference level is 1.2V, i.e. U
fb=1.2V.
Coil magnetic field is: B=μ n Ι,
μ: be the magnetic permeability in medium, the magnetic permeability of water is μ=0.999991
N: be coil turn, what adopt in the design is 800 circles
I: be electric current
Note: due to nMOS pipe Q5, conducting internal resistance is very little, negligible.
A scheme: work as R1=R2=... when=Rn=40 ohm, by controlling the control end CON_1 of electromagnetic relay, CON_2 ... CON_n, controls the resistance number that accesses sampling resistor network,
In the time that CON_1 is high level, only have R1 access sampling resistor network, electric current is
Work as CON_1, when CON_2 is high level, have R1 and R2 access in parallel sampling resistor network, electric current is
Work as CON_1, CON_2 ... when CON_6 is high level, there is R1, R2 ... R6 access in parallel sampling resistor network, electric current is
There are above-mentioned three kinds of states, can draw clearly electromagnetic intensities different in 3, thereby draw different magnetic field intensitys by the access state of controlling CON_n.
B scheme: work as R1=5, R2=10 ..., by controlling the control end CON_1 of electromagnetic relay, CON_2 when the Rn=n × 5 ohm ... CON_n, switches the resistance that accesses sampling resistor network.，
In the time that CON_1 is high level, only have R1 access sampling resistor network, electric current is
In the time that CON_2 is high level, there is R2 access sampling resistor network, electric current is
In the time that CON_6 is high level, there is R6 to connect into sampling resistor network, electric current is
There are above-mentioned three kinds of states, can draw clearly electromagnetic intensities different in 3, thereby draw different magnetic field intensitys by the access state of controlling CON_n.
The same mode that also can adopt A scheme implementation, the parallel connection that realizes different resistance is switched to produce more multi-level electromagnetic intensity.
Electromagnetic relay of the present invention can adopt analog switch to replace, and realizes circuit and switches.
The present invention, owing to adopting said structure, has high circuit efficiency, reduces overall power, strengthens the advantage such as measuring accuracy and stability of electromagnetic flowmeter in the time of low discharge.
Claims (3)
1. the multistage intensity commutation circuit of electromagnetic field, be provided with solenoid, the power control terminal that it is characterized in that described solenoid is provided with electromagnetic intensity switch unit, and it comprises DCDC controlled constant-current source circuit, DCDC switching power circuit, voltage follower and sampling resistor commutation circuit
Wherein,
Described DCDC controlled constant-current source circuit is made up of transistor Q5, amplifier U4, resistance R 9, chip U5, resistance R 10 and anti-interference capacitor C7, the reference voltage chip that described chip U5 is 1.2V, described chip U5 is in parallel with filter capacitor C7 carries out filtering to output voltage, described chip U5+12V is chip U5 power supply by resistance R 10, be connected to the 3rd pin of U4, form reference source, therefore the 3rd pin voltage of amplifier U4 is 1.2V; 1,8,5 pin of amplifier U4 are unsettled, in the time that sampling resistor commutation circuit is stablized, sampled voltage on sampling resistor is input to the 2nd pin of amplifier U4 by resistance R 9, and control the duty of transistor Q5 by resistance R 11 at the voltage of the 6th pin stable output, ensure to be constant by the electric current of electromagnetic relay
Described DCDC switching power circuit is made up of DCDC chip U3, electric capacity E1, diode D4, inductor L1, capacitor C 4, electric capacity E2, and power supply Vin is input to input voltage filtering by filter capacitor E1 the 1st pin of chip U3, is DCDC chip U3 power supply; The 3rd pin of U3, the 5th pin ground connection GnD respectively; Diode D4, inductor L1, capacitor C 4, electric capacity E2 forms current rectifying and wave filtering circuit, the 1st pin of the negative pole of diode D4 and inductor is connected to output the 2nd pin of chip U3, the 1st pin of the 2nd pin of inductor L1, the 1st pin of capacitor C 4, E2 is connected respectively to VCC, by Voltage-output, to electromagnetic relay circuit, the crus secunda of the positive pole of diode D4, the crus secunda of capacitor C 4 and electric capacity E2 is connected to power supply ground;
Described sampling resistor commutation circuit comprises n group commutation circuit, every group of commutation circuit comprises relay, diode D n, triode Q n and employing resistance R n, so that relay, diode D n, triode Q n and employing resistance R n form sampling resistor network, triode Q controls (front end can be the digital control circuits such as single-chip microcomputer) by the CON_n that is connected to the 1st pin, the ground of triode the 2nd pin ground connection, coil the 2nd pin that the 3rd pin connects electromagnetic relay RELAY n is connected, the 1st pin of electromagnetic relay RELAY n is connected to power supply+5V diode D1 as protecting diodes in parallel to the coil of electromagnetic relay REALY n, the negative pole of diode D2 is connected with the 1st pin of electromagnetic relay REALY n coil, the positive pole of diode D2 is connected with the 2nd pin of electromagnetic relay REALY n coil with the negative pole of diode D2, Chang Kaiduan the 4th pin of Chang Kaiduan the 4th pin of electromagnetic relay REALY n and the electromagnetic relay REALY n of other groups is connected to constant-current source circuit and switching power circuit provides sampled signal.Common port the 3rd pin of electromagnetic relay REALY n is connected with the 1st pin of sampling resistor R1, the 2nd pin ground connection of sampling resistor R1, when CON_ n is while being greater than the voltage of 0.7V, triode Q1 conducting, electromagnetic relay REALY n starts working, the 3rd pin of electromagnetic relay REALY n, the 4th pin closure, by sample circuit R1 access sampling resistor network.
2. the multistage intensity commutation circuit of a kind of electromagnetic field according to claim 1, it is characterized in that being provided with voltage follower circuit in described DCDC switching power circuit, described voltage follower circuit is by chip U6B, resistance R 12, resistance R 13, capacitor C 8 forms, in the time that sampling resistor commutation circuit keeps stablizing, TP1 voltage stabilization, by resistance R 13, sampled voltage is input to the 5th pin of chip U6B, the first pin of filter capacitor C8 is connected with the 5th pin of chip U6B, to ensure the stable of sampled voltage, power supply+12V,-12V is the U6B power supply of chip, be connected respectively to the 8th pin and the 4th pin of amplifier, the 6th pin of amplifier U6B is connected with the 1st pin, form voltage follower circuit, sampled voltage 1:1 is exported by the 7th pin, be input to the 4th pin of chip U3 by resistance R 12, for DCDC chip, U3 provides sampled voltage.
3. the multistage intensity of electromagnetic field is switched computing method, it is characterized in that being specifically calculated as follows:
Due to constant electromagnetic field formula: B=μ n Ι, μ is the magnetic permeability in vacuum, n is coil turn, I is electric current, the cell winding number of turn is for fixing, liquid magnetic conductance is also for fixing, therefore, magnetic field intensity is only current related with I, switch DCDC controlled constant-current source circuit output current by the sampling resistor size that changes DCDC voltage controlled current source, the each sampling resistor in sampling resistor commutation circuit accesses sample circuit by controlling electromagnetic relay, in the time selecting number of switches or path different, the voltage at sampling resistor circuit two ends is constant
Be U5, R10, the voltage of the reference source circuit output of C7 composition, that is, and Vref;
Therefore
Work as A:R1=R2=... when=Rn=R, then select the relay conducting of m road, the electric current obtaining to be,
Iref=Vref/(R/m)
Drawn by formula, in the time that m is larger, output current is larger, and the magnetic field that is applied to coil generation is larger.
Work as B:R1, R2 ... when Rn is unequal, selecting the relay conducting of m road to show that electric current is
Iref=Vref/(Rm)
Drawn by formula, when Rm more hour, be applied to the magnetic field that coil produces larger,
Wherein n and m are not less than 2 integer,
In the time that circuit does not switch, circuit can keep fixing one group of sampling resistor state, and DCDC voltage controlled current source can be exported steady current.
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| CN104568033B (en) * | 2014-12-31 | 2018-10-12 | 重庆川仪自动化股份有限公司 | High frequency excitation unit |
| CN105547383A (en) * | 2015-12-18 | 2016-05-04 | 合肥市恒昌自动化控制有限责任公司 | Fluid flow measuring method based on electromagnetic principle |
| CN112524655A (en) * | 2020-12-08 | 2021-03-19 | 珠海格力电器股份有限公司 | Magnetic field control circuit, ion flame control method and device and plasma cooker |
| CN112524655B (en) * | 2020-12-08 | 2022-02-25 | 珠海格力电器股份有限公司 | Magnetic field control circuit, ion flame control method and device and plasma cooker |
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