CN104634398B - A kind of excitation circuit adds high pressure system and method - Google Patents
A kind of excitation circuit adds high pressure system and method Download PDFInfo
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- CN104634398B CN104634398B CN201410797070.4A CN201410797070A CN104634398B CN 104634398 B CN104634398 B CN 104634398B CN 201410797070 A CN201410797070 A CN 201410797070A CN 104634398 B CN104634398 B CN 104634398B
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Abstract
It adds high pressure system and method the present invention provides a kind of excitation circuit, is applied to electromagnetic flowmeter, the system comprises: first control circuit, second control circuit, exciting current detection circuit and H-bridge drive circuit；First control circuit includes second source, and second control circuit includes third power supply；H-bridge drive circuit includes sensor；First control circuit, for controlling the connection and disconnection of second source and sensor；Second control circuit, for controlling the connection and disconnection of third power supply Yu the sensor；Exciting current detection circuit, for detecting the size of exciting current and preset value.Exciting current, which is controlled, by the connection of control second source and sensor and the connection of third power supply and sensor reaches preset value, excitation circuit provided by the invention adds high pressure system, the stabilization time for effectively shortening electromagnetic flowmeter exciting current, improve electromagnetic flowmeter sample frequency and sampling precision.
Description
Technical field
The present invention relates to technology of instrument and meter field, add high pressure system and side more specifically to a kind of excitation circuit
Method.
Background technique
The main function of sensor excitation circuit in electromagnetic flowmeter is to provide reliable and stable excitation for sensor to drive
Dynamic signal.
Currently used excitation circuit is as shown in Figure 1, comprising: H-bridge drive circuit 11, control circuit 12 and exciting current inspection
Slowdown monitoring circuit 13 forms.When the voltage input in control circuit 12 is high level, voltage input driving power is open-minded, passes through the H of closure
First switch and the 4th switch in bridge driving circuit 11, drive the exciting current direction of sensor to flow to the end B by the end A.Wherein
Exciting current detection circuit 13 is connected with H-bridge drive circuit 11 by constant-current source, and under the control of constant-current source, the 6th resistance will be encouraged
Magnetoelectricity circulation changes voltage signal into, makees input terminal ADC after voltage follow by amplifier to detect the size of exciting current, when encouraging
After magnetoelectricity stream reaches preset value, first switch and the 4th switch are disconnected, makes third switch and second switch conducting, makes sensor
Excitation circuit flows to the end A by the end B.
Since sensor belongs to inductive load, when characteristic determines the exciting current direction change for flowing through it, electric current
It is longer to stablize the time.However electromagnetic flowmeter in actual use, the excitation circuit direction of sensor is needed with certain
Frequency transformation, and considering sampling precision and under the premise of speed, need the stabilization time of exciting current the smaller the better.It is existing
Technology on constant-current source circuit mainly by adding high pressure, so that exciting current reaches stable state as early as possible, but it keeps excitation electric
The time that stream reaches stable state needs is long, and effect is not ideal enough.
Summary of the invention
In view of this, adding high pressure system and method the object of the present invention is to provide a kind of excitation circuit, to reduce excitation
Electric current reaches the time of stable state needs.
To achieve the goals above, the invention provides the following technical scheme:
On the one hand, it adds high pressure system the present invention provides a kind of excitation circuit, is applied to electromagnetic flowmeter, comprising:
First control circuit, second control circuit, exciting current detection circuit and H-bridge drive circuit；
The first control circuit includes second source, and the second control circuit includes third power supply；The H bridge driving
Circuit includes sensor；
The first control circuit, for controlling the connection and disconnection of the second source Yu the sensor；
The second control circuit, for controlling the connection and disconnection of the third power supply Yu the sensor；
The exciting current detection circuit, for detecting the size of exciting current and preset value；
The first control circuit is connected with the H-bridge drive circuit, the H-bridge drive circuit and the second control electricity
Road is connected, and the H-bridge drive circuit is connected with the excitation circuit detection circuit.
Preferably, the H-bridge drive circuit further include:
First power supply, constant-current source, first diode, first switch, second switch, second switch, third switch and the 4th
Switch；
The constant-current source is connected with first power supply, the positive phase with the first diode of the constant-current source
Even, the cathode of the first diode is connected with the tie point of the first switch and the second switch, the sensor and
The first switch is connected with the tie point that the third switchs, and the sensor and the second switch and the described 4th switch
Tie point be connected, it is described 4th switch with the third switch is connected.
Preferably, the first control circuit further include:
First voltage input, the first triode, the second diode, first resistor, second resistance, 3rd resistor, the three or three pole
Pipe, the 4th resistance and the 5th resistance；
4th resistance is connected with first voltage input, the 4th resistance and the 5th resistance and the third
The tie point of transistor base is connected, and the 5th resistance is connected with ground wire, and the emitter of the third transistor is with described
Line is connected, and the collector of the third transistor is connected with the 3rd resistor, the 3rd resistor and the second resistance phase
Even, the second resistance is connected with the base stage of first triode, the collector of first triode and the described 2nd 2
The anode of pole pipe is connected, and the cathode of second diode is connected with the H-bridge drive circuit；The transmitting of first triode
Pole is connected with second source, and the first resistor is connected with the emitter of first triode, the first resistor with it is described
3rd resistor is connected.
Preferably, the second control circuit further include:
Second voltage input, the second triode, third diode, the 6th resistance, the 7th resistance, the 8th resistance, the four or three pole
Pipe, the 9th resistance and the tenth resistance；
9th resistance is connected with second voltage input, the 9th resistance and the tenth resistance and the described 4th
The tie point of transistor base is connected, and the tenth resistance is connected with ground wire, and the emitter of the 4th triode is with described
Line is connected, and the collector of the 4th triode is connected with the 8th resistance, the 8th resistance and the 7th resistance phase
Even, the 7th resistance is connected with the base stage of second triode, the collector of second triode and the described 3rd 2
The anode of pole pipe is connected, and the cathode of the third diode is connected with the H-bridge drive circuit；The transmitting of second triode
Pole is connected with third power supply, and the 6th resistance is connected with the emitter of second triode, the first resistor with it is described
8th resistance is connected.
Preferably, the exciting current detection circuit includes:
Amplifier, eleventh resistor and analog to digital conversion circuit；
The eleventh resistor is connected with ground wire, and the eleventh resistor is connected with the non-inverting input terminal of the amplifier,
The reverse input end of the amplifier is connected with the output end of the amplifier, and the output end of the amplifier and the modulus turn
Circuit is changed to be connected；The eleventh resistor is connected with the intersection point of the non-inverting input terminal of the amplifier with the H-bridge drive circuit.
On the other hand, it adds high pressure method the present invention provides a kind of excitation circuit, increases applied to above-mentioned excitation circuit
Pressure system, comprising:
Step 1: when the first power input voltage signal, the first switch and the 4th switch conduction are described
When second switch and third switch disconnect, first voltage input controls the second source and connect with the sensor,
The sensor is set to reach preset value by the exciting current that left end flows to right end；
Step 2: detecting whether the exciting current reaches preset value using exciting current detection circuit, if it is, holding
Row step 3；If not, thening follow the steps 1；
Step 3: when the exciting current reaches preset value, first voltage input control the second source with it is described
Sensor disconnects；
Step 4: the first switch and the 4th switch disconnect, the second switch and the third switch conduction
When, second voltage input controls the third power supply and connect with the sensor, and the sensor is made to flow to left end by right end
Exciting current reach preset value；
Step 5: detect whether the exciting current reaches preset value using the excitation circuit detection circuit, if so,
Then follow the steps 6；If not, thening follow the steps 4；
Step 6: when the exciting current reaches the preset value, second voltage input control the third power supply with
The sensor disconnects, then continues to execute step 1.
Preferably, the step 1 includes:
When first voltage input is high level, first voltage input controls the second source and the sensor
Connection, makes the sensor reach preset value by the exciting current that left end flows to right end.
Preferably, the step 3 includes:
When the exciting current reaches preset value, first voltage input is reduced to low level by high level；
First voltage input controls the second source and disconnects with the sensor in low level.
Preferably, the step 4 includes:
When second voltage input is high level, second voltage input controls the third power supply and the sensor
Connection, makes the sensor reach preset value by the exciting current that right end flows to left end.
Preferably, the step 6 includes:
When the exciting current reaches preset value, second voltage input is reduced to low level by high level；
Second voltage input controls the third power supply and disconnects with the sensor in low level.
Compared with prior art, advantages of the present invention is as follows:
A kind of excitation circuit provided by the invention adds high pressure system, passes through the connection of control second source and sensor and the
The connection control exciting current of three power supplys and sensor reaches preset value, and uses exciting current detection circuit real-time detection excitation
The size of electric current makes exciting current reach stable state with the shorter time, increases constant current source power supply with passing through in the prior art
The mode of voltage is compared, and excitation circuit provided by the invention adds high pressure system, effectively shortens electromagnetic flowmeter exciting current
The stabilization time, improve electromagnetic flowmeter sample frequency and sampling precision.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is that a kind of excitation circuit for providing of the prior art adds high pressure a kind of structural schematic diagram of system；
Fig. 2 is that a kind of excitation circuit provided in an embodiment of the present invention adds high pressure a kind of structural schematic diagram of system；
Fig. 3 be a kind of excitation circuit provided in an embodiment of the present invention add high pressure method a kind of H-bridge drive circuit one kind
Structural schematic diagram；
Fig. 4 be a kind of excitation circuit provided in an embodiment of the present invention add high pressure method a kind of first control circuit one kind
Structural schematic diagram；
Fig. 5 be a kind of excitation circuit provided in an embodiment of the present invention add high pressure method a kind of second control circuit one kind
Structural schematic diagram；
Fig. 6 is that a kind of excitation circuit provided in an embodiment of the present invention adds high pressure a kind of exciting current detection circuit of method
A kind of structural schematic diagram；
Fig. 7 is that a kind of excitation circuit provided in an embodiment of the present invention adds high pressure a kind of flow chart of method.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to FIG. 2, adding high pressure system it illustrates a kind of excitation circuit provided in an embodiment of the present invention, it is applied to electromagnetism
Flowmeter, comprising: first control circuit 31, second control circuit 32, exciting current detection circuit 33 and H-bridge drive circuit 34；
Wherein:
First control circuit 31 includes second source 52, and second control circuit 32 includes third power supply 62；H-bridge drive circuit
Including sensor 48；
First control circuit 31, for controlling the connection and disconnection of second source 52 Yu sensor 48；
Second control circuit 32, for controlling the connection of third power supply 62 and sensor 48 and disconnecting exciting current detection electricity
Road 33, for detecting the size of exciting current and preset value；
First control circuit 31 is connected with H-bridge drive circuit 34, and H-bridge drive circuit 34 is connected with second control circuit 32, H
Bridge driving circuit 34 is connected with excitation circuit detection circuit 33.
Wherein, it adds high pressure in system in a kind of excitation circuit provided in an embodiment of the present invention, referring to FIG. 3, it illustrates
A kind of excitation circuit provided in an embodiment of the present invention add high pressure system a kind of H-bridge drive circuit a kind of structural schematic diagram, also
May include:
First power supply 41, constant-current source 42, first diode 43, first switch 44, second switch 45, third switch 46 and
Four switches 47；
Constant-current source 42 is connected with the first power supply 41, and constant-current source 42 is connected with the anode of first diode 43, and the one or two
The cathode of pole pipe 43 is connected with the tie point of first switch 44 and second switch 45, and sensor 48 is opened with first switch 44 and third
It closes 46 tie point to be connected, sensor 48 is connected with the tie point of second switch 45 and the 4th switch 47, the 4th switch 47 and the
Three switches 46 are connected.
Wherein, referring to FIG. 4, adding high pressure one kind of system it illustrates a kind of excitation circuit provided in an embodiment of the present invention
A kind of structural schematic diagram of first control circuit can also include:
First voltage input 51, the first triode 53, the second diode 54, first resistor 55, second resistance 56,3rd resistor
57, third transistor 58, the 4th resistance 59 and the 5th resistance 60；
4th resistance 59 is connected with the first voltage input 51,58 base stage of the 4th resistance 59 and the 5th resistance 60 and third transistor
Tie point be connected, the 5th resistance 60 is connected with ground wire, and the emitter of third transistor 58 is connected with ground wire, third transistor 58
Collector be connected with 3rd resistor 57,3rd resistor 57 is connected with second resistance 56, second resistance 56 and the first triode 53
Base stage be connected, the collector of the first triode 53 is connected with the anode of the second diode 54, the cathode and H of the second diode 54
Bridge driving circuit 34 is connected；The emitter of first triode 53 is connected with second source 52, first resistor 55 and the first triode
53 emitter is connected, and first resistor 55 is connected with 3rd resistor 57.
Wherein, referring to FIG. 5, adding high pressure one kind of system it illustrates a kind of excitation circuit provided in an embodiment of the present invention
A kind of structural schematic diagram of second control circuit can also include:
Second voltage input 61, the second triode 63, third diode 64, the 6th resistance 65, the 7th resistance 66, the 8th resistance
67, the 4th triode 68, the 9th resistance 69 and the tenth resistance 70；
9th resistance 69 is connected with the second voltage input 61, the 9th resistance 69 and the tenth resistance 70 and 68 base stage of the 4th triode
Tie point be connected, the tenth resistance 70 is connected with ground wire, and the emitter of the 4th triode 68 is connected with ground wire, the 4th triode 68
Collector be connected with the 8th resistance 67, the 8th resistance 67 is connected with the 7th resistance 66, the 7th resistance 66 and the second triode 63
Base stage be connected, the collector of the second triode 63 is connected with the anode of third diode 64, the cathode and H of third diode 64
Bridge driving circuit 34 is connected；The emitter of second triode 63 is connected with third power supply 62, the 6th resistance 65 and the second triode
63 emitter is connected, and the 6th resistance 65 is connected with the 8th resistance 67.
Wherein, referring to FIG. 6, adding high pressure one kind of system it illustrates a kind of excitation circuit provided in an embodiment of the present invention
A kind of structural schematic diagram of exciting current detection circuit may include:
Amplifier 71, eleventh resistor 72 and analog to digital conversion circuit 73；
Eleventh resistor 72 is connected with ground wire, and eleventh resistor 72 is connected with the non-inverting input terminal of amplifier 71, amplifier
71 reverse input end is connected with the output end of amplifier 71, and the output end of amplifier 71 is connected with analog to digital conversion circuit 73；The
11 resistance 72 are connected with the intersection point of the non-inverting input terminal of amplifier 71 with H-bridge drive circuit 34.
It should be noted that add high pressure in system in a kind of excitation circuit provided in an embodiment of the present invention, the first control electricity
Road 31 is identical as the structure of second control circuit 32, and the device type that first control circuit 31 and second control circuit 32 are selected
It is also possible to identical.
It adds high pressure in system in a kind of excitation circuit provided in an embodiment of the present invention, in original state, the first voltage input 51
It is all low level with the second voltage input 61 control high voltage control signal, and second source 52 and third power supply 62 are in disconnection shape
State.When the first power supply 52 starts as excitation circuit power supply, first switch 44 and the 4th switch 47 are connected, second switch 45 and the
Three switches 46 disconnect, and the first voltage input 51 makes the high voltage control signal high level at 31 end of first control circuit, the second voltage input
61 make the high voltage control signal low level at 32 end of second control circuit, therefore the high voltage control signal in first control circuit 31
In the case where for high level, second source 52 is connected with sensor 48 so that control sensor 48 by left end flow to right end (by
The end A flows to the end B) exciting current it is stable as early as possible, while using exciting current detection circuit 33 detect exciting current whether reach
Preset value, when exciting current reaches preset value, the first voltage input 51 control high voltage control signal is converted to low level, therefore second
Power supply 52 is disconnected with sensor, and during its, exciting current provides electricity by the constant-current source 42 in H-bridge drive circuit 32
Pressure.
Similarly, it is connected in second switch 45 and third switch 46, in the state of first switch 44 and the disconnection of the 4th switch 47,
Can be achieved second control circuit 32 in second source 52 to sensor 48 in H-bridge drive circuit 34 in connected state, excitation electricity
The traffic organising from right end to left end is flowed, and reaches the stable state of preset value, i.e., exciting current flows to the end A by the end B.
It should be noted that second control circuit 32, which controls exciting current, reaches stable state in the case where flow direction is certain
Mode and first control circuit 32 control exciting current to reach the mode of stable state in the case where flow direction is certain consistent,
Therefore this is no longer described in detail.
It is understood that since the characteristic of sensor 48 itself is it is found that sensor 48 needs suitably in use
Electric current carried out to it turn to, if being easy to make to sense this is because the electric current of sensor 48 is always same when flowing to
The reduced performance of device 48, therefore need in due course to carry out current direction steering to sensor 48.
A kind of excitation circuit provided in an embodiment of the present invention adds high pressure system, passes through the company of control second source and sensor
It connects and reaches preset value with the connection of third power supply and sensor control exciting current, and examined in real time using exciting current detection circuit
The size for surveying exciting current, makes exciting current reach stable state with the shorter time, increases constant current with passing through in the prior art
The mode of source supply voltage is compared, and excitation circuit provided by the invention adds high pressure system, is effectively shortened electromagnetic flowmeter and is encouraged
The stabilization time of magnetoelectricity stream, improve electromagnetic flowmeter sample frequency and sampling precision.
Referring to FIG. 7, adding high pressure a kind of process of method it illustrates a kind of excitation circuit provided in an embodiment of the present invention
Figure adds high pressure system applied to above-mentioned excitation circuit, may comprise steps of:
Step 101: when the first power input voltage signal, first switch and the 4th switch conduction, second switch and third
When switch disconnects, the first voltage input control second source is connect with sensor, and sensor is made to flow to the excitation electricity of right end by left end
Stream reaches preset value.
Step 102: whether preset value being reached using exciting current detection circuit detection exciting current, if it is, executing
Step 103；If not, thening follow the steps 101.
Step 103: when exciting current reaches preset value, the first voltage input controls second source and sensor disconnects and connecting
It connects.
Step 104: first switch and the 4th switch disconnect, when second switch and third switch conduction, the second voltage input control
Third power supply processed is connect with sensor, and sensor is made to reach preset value by the exciting current that right end flows to left end.
Step 105: whether preset value being reached using excitation circuit detection circuit detection exciting current, if it is, executing
Step 106；If not, thening follow the steps 104.
Step 106: when exciting current reaches preset value, the second voltage input controls third power supply and sensor disconnects and connecting
It connects, then continues to execute step 101.
It should be noted that when the first power input voltage signal, circuit conducting.It is led in first switch and the 4th switch
It is logical, in the case where second switch and third switch disconnection, when the first voltage input is high level, the second electricity of the first voltage input control
Source is connect with sensor, so that the exciting current of sensor is flowed to right end by left end, and reach exciting current in a relatively short period of time
To stable state.Whether preset value is reached using exciting current detection circuit detection exciting current simultaneously, when exciting current reaches
When preset value, the first voltage input is reduced to low level by high level, and the first voltage input is in low level, control second source and sensing
Device disconnects.If exciting current is also not up to preset value, continue the flow direction for keeping exciting current.
In order to reduce the performance loss of sensor, need the exciting current of sensor carrying out Flow reverse.Therefore it needs H
First switch and the 4th switch in bridge driving circuit disconnect, second switch and third switch conduction, and when the second voltage input is
When high level, the second voltage input control third power supply is connected with sensor, and the exciting current of sensor is made to flow to left end by right end
Reach stable state.Whether preset value is reached using exciting current detection circuit detection exciting current simultaneously, when exciting current reaches
When to preset value, the second voltage input is reduced to low level by high level, and the second voltage input control third power supply and is passed in low level
Sensor disconnects, and continues the flow direction of conversion sensor exciting current.If exciting current is also not up to preset value, after continuation of insurance
Hold the flow direction of exciting current.
It should be noted that preset value is before excitation circuit on state, according to one of the setting of the performance of sensor
Exciting current value, it is closely bound up with the performance of sensor.
It adds high pressure in method in a kind of excitation circuit provided in an embodiment of the present invention, when first switch and the 4th switch are led
Logical, when second switch and third switch disconnect, the first voltage input in first control circuit is by controlling high voltage control signal
High level, in first control circuit, second source connect conducting with sensor, and the electric current for controlling sensor flows to B by the end A
End, and control exciting current and be in stable state, detect whether exciting current has reached pre- by excitation circuit detection circuit
If value, if after exciting current reaches preset value, the first voltage input, which controls high voltage control signal, becomes low level from high level, then leads to
High voltage control signal control third power supply and sensor in the second voltage input control second control circuit in high level is crossed to connect
It connects, to control the electric current of sensor in the case where second switch and third switch conduction first switch and the 4th switch disconnect
The end A is flowed to by the end B, and reaches stable state, is circuited sequentially, the flow direction of the change exciting current of interval time section, to avoid biography
The damage of sensor performance.
A kind of excitation circuit provided in an embodiment of the present invention adds high pressure method, directly utilizes first control circuit and the second control
Second source and third power supply and sensor in circuit processed connect or disconnect the flow direction of state control exciting current, keep excitation electric
Stream reaches stable state in a relatively short period of time, and uses the size of exciting current detection circuit real-time detection exciting current, with
It is compared by way of increasing constant current source power supply voltage in the prior art, excitation circuit provided by the invention adds high pressure system, has
The stabilization time for shortening electromagnetic flowmeter exciting current of effect, improve electromagnetic flowmeter sample frequency and sampling precision.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
Claims (9)
- The system 1. a kind of excitation circuit adds high pressure is applied to electromagnetic flowmeter characterized by comprisingFirst control circuit, second control circuit, exciting current detection circuit and H-bridge drive circuit；The first control circuit includes second source, and the second control circuit includes third power supply；The H-bridge drive circuit Including sensor；The first control circuit, for controlling the connection and disconnection of the second source Yu the sensor；The second control circuit, for controlling the connection and disconnection of the third power supply Yu the sensor；The exciting current detection circuit, for detecting the size of exciting current and preset value；The first control circuit is connected with the H-bridge drive circuit, the H-bridge drive circuit and the second control circuit phase Even, the H-bridge drive circuit is connected with the excitation circuit detection circuit；Wherein, the first control circuit further include:First voltage input, the first triode, the second diode, first resistor, second resistance, 3rd resistor, third transistor, Four resistance and the 5th resistance；4th resistance is connected with first voltage input, the 4th resistance and the 5th resistance and the three or three pole The tie point of pipe base stage is connected, and the 5th resistance is connected with ground wire, the emitter of the third transistor and the ground wire phase Even, the collector of the third transistor is connected with the 3rd resistor, and the 3rd resistor is connected with the second resistance, institute It states second resistance to be connected with the base stage of first triode, the collector of first triode and second diode Anode is connected, and the cathode of second diode is connected with the H-bridge drive circuit；The emitter of first triode and Two power supplys are connected, and the first resistor is connected with the emitter of first triode, the first resistor and third electricity Resistance is connected.
- 2. system according to claim 1, which is characterized in that the H-bridge drive circuit further include:First power supply, constant-current source, first diode, first switch, second switch, third switch and the 4th switch；The constant-current source is connected with first power supply, and the constant-current source is connected with the anode of the first diode, institute The cathode for stating first diode is connected with the tie point of the first switch and the second switch, the sensor and described the The tie point that one switch is switched with the third is connected, the connection of the sensor and the second switch and the 4th switch Point is connected, and the 4th switch is connected with third switch.
- 3. system according to claim 1, which is characterized in that the second control circuit further include:Second voltage input, the second triode, third diode, the 6th resistance, the 7th resistance, the 8th resistance, the 4th triode, Nine resistance and the tenth resistance；9th resistance is connected with second voltage input, the 9th resistance and the tenth resistance and the four or three pole The tie point of pipe base stage is connected, and the tenth resistance is connected with ground wire, emitter and the ground wire phase of the 4th triode Even, the collector of the 4th triode is connected with the 8th resistance, and the 8th resistance is connected with the 7th resistance, institute It states the 7th resistance to be connected with the base stage of second triode, the collector of second triode and the third diode Anode is connected, and the cathode of the third diode is connected with the H-bridge drive circuit；The emitter of second triode and Three power supplys are connected, and the 6th resistance is connected with the emitter of second triode, the first resistor and the 8th electricity Resistance is connected.
- 4. system according to claim 1, which is characterized in that the exciting current detection circuit includes:Amplifier, eleventh resistor and analog to digital conversion circuit；The eleventh resistor is connected with ground wire, and the eleventh resistor is connected with the non-inverting input terminal of the amplifier, described The reverse input end of amplifier is connected with the output end of the amplifier, the output end of the amplifier and analog-to-digital conversion electricity Road is connected；The eleventh resistor is connected with the intersection point of the non-inverting input terminal of the amplifier with the H-bridge drive circuit.
- A kind of method 5. excitation circuit adds high pressure, adds high pressure system applied to excitation circuit as claimed in claim 2, and feature exists In, comprising:Step 1: when the first power input voltage signal, the first switch and the 4th switch conduction, described second When switch and third switch disconnect, first voltage input controls the second source and connect with the sensor, makes institute It states sensor and preset value is reached by the exciting current that left end flows to right end；Step 2: detecting whether the exciting current reaches preset value using exciting current detection circuit, if it is, executing step Rapid 3；If not, thening follow the steps 1；Step 3: when the exciting current reaches preset value, first voltage input controls the second source and the sensing Device disconnects；Step 4: the first switch and the 4th switch disconnect, when the second switch and the third switch conduction, institute It states the second voltage input control third power supply to connect with the sensor, the sensor is made to flow to the excitation of left end by right end Electric current reaches preset value；Step 5: detecting whether the exciting current reaches preset value using the excitation circuit detection circuit, if it is, holding Row step 6；If not, thening follow the steps 4；Step 6: when the exciting current reaches the preset value, second voltage input control the third power supply with it is described Sensor disconnects, then continues to execute step 1.
- 6. according to the method described in claim 5, it is characterized in that, the step 1 includes:When first voltage input is high level, first voltage input controls the second source and the sensor connects It connects, the sensor is made to reach the preset value by the exciting current that left end flows to right end.
- 7. according to the method described in claim 5, it is characterized in that, the step 3 includes:When the exciting current reaches preset value, first voltage input is reduced to low level by high level；First voltage input controls the second source and disconnects with the sensor in low level.
- 8. according to the method described in claim 5, it is characterized in that, the step 4 includes:When second voltage input is high level, second voltage input controls the third power supply and the sensor connects It connects, the sensor is made to reach the preset value by the exciting current that right end flows to left end.
- 9. according to the method described in claim 5, it is characterized in that, the step 6 includes:When the exciting current reaches preset value, second voltage input is reduced to low level by high level；Second voltage input controls the third power supply and disconnects with the sensor in low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410797070.4A CN104634398B (en) | 2014-12-19 | 2014-12-19 | A kind of excitation circuit adds high pressure system and method |
Applications Claiming Priority (1)
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| CN105277241B (en) * | 2015-11-26 | 2019-01-25 | 重庆川仪自动化股份有限公司 | A kind of excitation accelerating circuit and excitation accelerated method for electromagnetic flowmeter |
| CN105841761B (en) * | 2016-05-28 | 2019-02-22 | 上海大学 | The Constant Current Control System of variable-frequency electromagnetic flow meter magnet exciting coil |
| CN112394244B (en) * | 2019-08-19 | 2021-09-14 | 广东美的白色家电技术创新中心有限公司 | Detection circuit, electric appliance and control method |
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| JP2002206956A (en) * | 2001-01-10 | 2002-07-26 | Shimadzu Corp | Electromagnetic flowmeter |
| JP2007315813A (en) * | 2006-05-23 | 2007-12-06 | Keyence Corp | Electromagnetic flowmeter, exciting circuit for same, and method for exciting electromagnetic flowmeter |
| CN101726334A (en) * | 2009-12-23 | 2010-06-09 | 合肥工业大学 | Electromagnetic flow meter excitation control system based on high and low voltage power switching |
| CN102393225A (en) * | 2011-11-08 | 2012-03-28 | 合肥工业大学 | High/low voltage switching excitation system of electromagnetic flowmeter with bypass and energy feedback circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002206956A (en) * | 2001-01-10 | 2002-07-26 | Shimadzu Corp | Electromagnetic flowmeter |
| JP2007315813A (en) * | 2006-05-23 | 2007-12-06 | Keyence Corp | Electromagnetic flowmeter, exciting circuit for same, and method for exciting electromagnetic flowmeter |
| CN101726334A (en) * | 2009-12-23 | 2010-06-09 | 合肥工业大学 | Electromagnetic flow meter excitation control system based on high and low voltage power switching |
| CN102393225A (en) * | 2011-11-08 | 2012-03-28 | 合肥工业大学 | High/low voltage switching excitation system of electromagnetic flowmeter with bypass and energy feedback circuit |
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