CN104634398A - Excitation circuit high voltage increasing system and method - Google Patents
Excitation circuit high voltage increasing system and method Download PDFInfo
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- CN104634398A CN104634398A CN201410797070.4A CN201410797070A CN104634398A CN 104634398 A CN104634398 A CN 104634398A CN 201410797070 A CN201410797070 A CN 201410797070A CN 104634398 A CN104634398 A CN 104634398A
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Abstract
The invention provides an excitation circuit high voltage increasing system and method, and is applied to an electromagnetic flowmeter. The excitation circuit high voltage increasing system comprises a first control circuit, a second control circuit, an exciting current detecting circuit and an H bridge drive circuit; the first control circuit comprises a second power source, and the second control circuit comprise a third power source; the H bridge drive circuit comprises a sensor; the first control circuit is used for controlling the connection and the disconnection between the second power source and the sensor; the second control circuit is used for controlling the connection and the disconnection between the third power source and the sensor; the exciting current detecting circuit is used for detecting the magnitude of exciting current and preset value. The exciting current is controlled to achieve the preset value by controlling the connection between the second power source and the sensor and the connection between the third power source and the sensor, the excitation circuit high voltage increasing system effectively shortens the stabilization time of the exciting current of the electromagnetic flowmeter, and sampling frequency and sampling precision of the electromagnetic flowmeter are improved.
Description
Technical field
The present invention relates to technology of instrument and meter field, more particularly, relate to a kind of field circuit and to add high pressure system and method.
Background technology
The Main Function of the sensor field circuit in electromagnetic flowmeter is for sensor provides reliable and stable excitation drive singal.
Field circuit conventional at present as shown in Figure 1, comprising: H-bridge drive circuit 11, control circuit 12 and exciting current testing circuit 13 form.When the control source in control circuit 12 is high level, control source driving power open-minded, by the first switch in closed H-bridge drive circuit 11 and the 4th switch, the exciting current direction of driving sensor is held by A and is flowed to B end.Wherein exciting current testing circuit 13 is connected by constant current source with H-bridge drive circuit 11, under the control of constant current source, 6th resistance converts exciting current to voltage signal, after making voltage follow by amplifier, input end ADC is to detect the size of exciting current, after exciting current reaches preset value, disconnect the first switch and the 4th switch, make the 3rd switch and second switch conducting, the field circuit of sensor is held by B and flows to A end.
Because sensor belongs to inductive load, when its characteristic determines the exciting current direction change flowing through it, the stabilization time of electric current is longer.But in the actual use procedure of electromagnetic flowmeter, the field circuit direction of sensor needs with certain frequency transformation, and under the prerequisite considering sampling precision and speed, need the stabilization time of exciting current the smaller the better.Prior art mainly by adding high pressure on constant-current source circuit, and to make exciting current reach steady state (SS) as early as possible, but it makes exciting current reach, and time that steady state (SS) needs is long, and effect is not ideal enough.
Summary of the invention
In view of this, the object of this invention is to provide a kind of field circuit and to add high pressure system and method, reach in order to reduce exciting current the time that steady state (SS) needs.
To achieve these goals, the invention provides following technical scheme:
On the one hand, the invention provides a kind of field circuit and to add high pressure system, be applied to electromagnetic flowmeter, comprise:
First control circuit, second control circuit, exciting current testing circuit and H-bridge drive circuit;
Described first control circuit comprises second source, and described second control circuit comprises the 3rd power supply; Described H-bridge drive circuit comprises sensor;
Described first control circuit, for controlling connection and the disconnection of described second source and described sensor;
Described second control circuit, for controlling connection and the disconnection of described 3rd power supply and described sensor;
Described exciting current testing circuit, for detecting the size of exciting current and preset value;
Described first control circuit is connected with described H-bridge drive circuit, and described H-bridge drive circuit is connected with described second control circuit, and described H-bridge drive circuit is connected with described field circuit testing circuit.
Preferably, described H-bridge drive circuit also comprises:
First power supply, constant current source, the first diode, the first switch, second switch, second switch, the 3rd switch and the 4th switch;
Being connected with described first power supply of described constant current source, being connected with the positive pole of described first diode of described constant current source, the negative pole of described first diode is connected with the tie point of described second switch with described first switch, described sensor is connected with the tie point of described first switch with described 3rd switch, described sensor is connected with the tie point of described second switch with described 4th switch, and described 4th switch is connected with described 3rd switch.
Preferably, described first control circuit also comprises:
First controls source, the first triode, the second diode, the first resistance, the second resistance, the 3rd resistance, the 3rd triode, the 4th resistance and the 5th resistance;
Described 4th resistance and described first controls source and is connected, described 4th resistance is connected with the tie point of described 5th resistance with described 3rd transistor base, described 5th resistance is connected with ground wire, the emitter of described 3rd triode is connected with described ground wire, the collector of described 3rd triode is connected with described 3rd resistance, described 3rd resistance is connected with described second resistance, described second resistance is connected with the base stage of described first triode, the collector of described first triode is connected with the positive pole of described second diode, the negative pole of described second diode is connected with described H-bridge drive circuit, the emitter of described first triode is connected with second source, and described first resistance is connected with the emitter of described first triode, and described first electronics is connected with described 3rd resistance.
Preferably, described second control circuit also comprises:
Second controls source, the second triode, the 3rd diode, the 6th resistance, the 7th resistance, the 8th resistance, the 4th triode, the 9th resistance and the tenth resistance;
Described 9th resistance and the described 3rd controls source and is connected, described 9th resistance is connected with the tie point of described tenth resistance with described 4th transistor base, described tenth resistance is connected with ground wire, the emitter of described 4th triode is connected with described ground wire, the collector of described 4th triode is connected with described 8th resistance, described 8th resistance is connected with described 7th resistance, described 7th resistance is connected with the base stage of described second triode, the collector of described second triode is connected with the positive pole of described 3rd diode, the negative pole of described 3rd diode is connected with described H-bridge drive circuit, the emitter of described second triode is connected with the 3rd power supply, and described 6th resistance is connected with the emitter of described second triode, and described first electronics is connected with described 8th resistance.
Preferably, described exciting current testing circuit comprises:
Amplifier, the 11 resistance and the 4th power supply;
Described 11 resistance is connected with ground wire, and described 11 resistance is connected with the in-phase input end of described amplifier, and the reverse input end of described amplifier is connected with the output terminal of described amplifier, and the output terminal of described amplifier is connected with described 4th power supply; Described 11 resistance is connected with described H-bridge drive circuit with the intersection point of the in-phase input end of described amplifier.
On the other hand, the invention provides a kind of field circuit and to add high pressure method, be applied to above-mentioned field circuit and add high pressure system, comprising:
Step 1: when described first power input voltage signal, described first switch and described 4th switch conduction, when described second switch and described 3rd switch disconnect, described first control source controls described second source and is connected with described sensor, and the exciting current making described sensor flow to right-hand member by left end reaches preset value;
Step 2: adopt exciting current testing circuit to detect described exciting current and whether reach preset value, if so, then performs step 3; If not, then step 1 is performed;
Step 3: when described exciting current reaches preset value, described first control source controls described second source and described sensor disconnects;
Step 4: described first switch and described 4th switch disconnect, when described second switch and described 3rd switch conduction, described second controls source described 3rd power supply of control is connected with described sensor, and the exciting current making described sensor flow to left end by right-hand member reaches preset value;
Step 5: adopt described field circuit testing circuit to detect described exciting current and whether reach preset value, if so, then performs step 6; If not, then step 4 is performed;
Step 6: when described exciting current reaches described preset value, described second control source controls described 3rd power supply and described sensor disconnects, then continue to perform step 1.
Preferably, described step 1 comprises:
When described first control source is high level, described first control source controls described second source and is connected with described sensor, and the exciting current making described sensor flow to right-hand member by left end reaches preset value.
Preferably, described step 3 comprises:
When described exciting current reaches preset value, low level is reduced to by high level in described first control source;
Described first controls source when low level, controls described second source and described sensor disconnects.
Preferably, described step 4 comprises:
When described second control source is high level, described second controls source described 3rd power supply of control is connected with described sensor, and the exciting current making described sensor flow to left end by right-hand member reaches preset value.
Preferably, described step 6 comprises:
When described exciting current reaches preset value, low level is reduced to by high level in described second control source;
Described second controls source when low level, controls described 3rd power supply and described sensor disconnects.
Compared with prior art, advantage of the present invention is as follows:
A kind of field circuit provided by the invention adds high pressure system, preset value is reached by controlling second source and the connection of sensor and the connection control exciting current of the 3rd power supply and sensor, and adopt exciting current testing circuit to detect the size of exciting current in real time, exciting current is made to reach steady state (SS) with the shorter time, with in prior art by compared with the mode that strengthens constant current source power supply voltage, field circuit provided by the invention adds high pressure system, effectively shorten the stabilization time of electromagnetic flowmeter exciting current, improve electromagnetic flowmeter sample frequency and sampling precision.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 to add high pressure a kind of structural representation of system for a kind of field circuit that prior art provides;
Fig. 2 to add high pressure a kind of structural representation of system for a kind of field circuit that the embodiment of the present invention provides;
Fig. 3 to add high pressure a kind of a kind of structural representation of H-bridge drive circuit of method for a kind of field circuit that the embodiment of the present invention provides;
Fig. 4 to add high pressure a kind of a kind of structural representation of first control circuit of method for a kind of field circuit that the embodiment of the present invention provides;
Fig. 5 to add high pressure a kind of a kind of structural representation of second control circuit of method for a kind of field circuit that the embodiment of the present invention provides;
Fig. 6 to add high pressure a kind of a kind of structural representation of exciting current testing circuit of method for a kind of field circuit that the embodiment of the present invention provides;
Fig. 7 to add high pressure a kind of process flow diagram of method for a kind of field circuit that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 2, a kind of field circuit that it illustrates the embodiment of the present invention provides adds high pressure system, is applied to electromagnetic flowmeter, comprises: first control circuit 31, second control circuit 32, exciting current testing circuit 33 and H-bridge drive circuit 34; Wherein:
First control circuit 31 comprises second source 52, and second control circuit 32 comprises the 3rd power supply 62; H-bridge drive circuit comprises sensor 48;
First control circuit 31, for controlling connection and the disconnection of second source 52 and sensor 48;
Second control circuit 32, for controlling the connection of the 3rd power supply 62 and sensor 48 and disconnecting exciting current testing circuit 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, and H-bridge drive circuit 34 is connected with field circuit testing circuit 33.
Wherein, a kind of field circuit provided in the embodiment of the present invention adds high pressure in system, please refer to Fig. 3, and a kind of field circuit that it illustrates the embodiment of the present invention provides adds high pressure a kind of a kind of structural representation of H-bridge drive circuit of system, can also comprise:
First power supply 41, constant current source 42, first diode 43, first switch 44, second switch 45, the 3rd switch 46 and the 4th switch 47;
Being connected with the first power supply 41 of constant current source 42, being connected with the positive pole of the first diode 43 of constant current source 42, the negative pole of the first diode 43 is connected with the tie point of second switch 45 with the first switch 44, sensor 48 is connected with the tie point of the first switch 44 with the 3rd switch 46, sensor 48 is connected with the tie point of second switch 45 with the 4th switch 47, and the 4th switch 47 is connected with the 3rd switch 46.
Wherein, please refer to Fig. 4, a kind of field circuit that it illustrates the embodiment of the present invention provides adds high pressure a kind of a kind of structural representation of first control circuit of system, can also comprise:
First controls source 51, first triode 53, second diode 54, first resistance 55, second resistance 56, the 3rd resistance 57, the 3rd triode 58, the 4th resistance 59 and the 5th resistance 60;
4th resistance 59 and first controls source 51 and is connected, 4th resistance 59 is connected with the tie point of the 5th resistance 60 with the 3rd triode 58 base stage, 5th resistance 60 is connected with ground wire, the emitter of the 3rd triode 58 is connected with ground wire, the collector of the 3rd triode 58 is connected with the 3rd resistance 57,3rd resistance 57 is connected with the second resistance 56, second resistance 56 is connected with the base stage of the first triode 53, the collector of the first triode 53 is connected with the positive pole of the second diode 54, and the negative pole of the second diode 54 is connected with H-bridge drive circuit 34; The emitter of the first triode 53 is connected with second source 52, and the first resistance 55 is connected with the emitter of the first triode 53, and the first resistance 55 is connected with the 3rd resistance 57.
Wherein, please refer to Fig. 5, a kind of field circuit that it illustrates the embodiment of the present invention provides adds high pressure a kind of a kind of structural representation of second control circuit of system, can also comprise:
Second controls source 61, second triode 63, the 3rd 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 and second controls source 61 and is connected, 9th resistance 69 is connected with the tie point of the tenth resistance 70 with the 4th triode 68 base stage, tenth resistance 70 is connected with ground wire, the emitter of the 4th triode 68 is connected with ground wire, the collector of the 4th triode 68 is connected with the 8th resistance 67,8th resistance 67 is connected with the 7th resistance 66,7th resistance 66 is connected with the base stage of the second triode 63, the collector of the second triode 63 is connected with the positive pole of the 3rd diode 64, and the negative pole of the 3rd diode 64 is connected with H-bridge drive circuit 34; The emitter of the second triode 63 is connected with the 3rd power supply 62, and the 6th resistance 65 is connected with the emitter of the second triode 63, and the 6th resistance 65 is connected with the 8th resistance 67.
Wherein, please refer to Fig. 6, a kind of field circuit that it illustrates the embodiment of the present invention provides adds high pressure a kind of a kind of structural representation of exciting current testing circuit of system, can comprise:
Amplifier the 71, the 11 resistance 72 and the 4th power supply 73;
11 resistance 72 is connected with ground wire, and the 11 resistance 72 is connected with the in-phase input end of amplifier 71, and the reverse input end of amplifier 71 is connected with the output terminal of amplifier 71, and the output terminal of amplifier 71 is connected with the 4th power supply 73; 11 resistance 72 is connected with H-bridge drive circuit 34 with the intersection point of the in-phase input end of amplifier 71.
It should be noted that, a kind of field circuit provided in the embodiment of the present invention adds high pressure in system, first control circuit 31 is identical with the structure of second control circuit 32, and first control circuit 31 and the device model that second control circuit 32 is selected also can be identical.
A kind of field circuit provided in the embodiment of the present invention adds high pressure in system, and in original state, the first control source 51 and the second control source 61 control high voltage control signal and be all low level, and second source 52 and the 3rd power supply 62 are all in off-state.When the first power supply 52 starts to power for field circuit, first switch 44 and the 4th switch 47 conducting, second switch 45 and the 3rd switch 46 disconnect, first control source 51 makes the high voltage control signal of first control circuit 31 end be high level, second control source 61 makes the high voltage control signal of second control circuit 32 end be low level, therefore the high voltage control signal in first control circuit 31 is when being high level, second source 52 is connected with sensor 48, stablize as early as possible with the exciting current making control sensor 48 flow to right-hand member (held by A and flow to B end) by left end, utilize exciting current testing circuit 33 to detect exciting current simultaneously and whether reach preset value, when exciting current reaches preset value, first control source 51 controls high voltage control signal and is converted to low level, therefore second source 52 and sensor disconnect, in its process, exciting current provides voltage by the constant current source 42 in H-bridge drive circuit 32.
In like manner, in second switch 45 and the 3rd switch 46 conducting, under the state that first switch 44 and the 4th switch 47 disconnect, sensor 48 can be realized in second control circuit 32 in second source 52 pairs of H-bridge drive circuit 34 in connected state, exciting current is by the traffic organising of right-hand member to left end, and reach the steady state (SS) of preset value, namely exciting current is held by B and is flowed to A end.
It should be noted that, second control circuit 32 controls exciting current flowing to mode that certain situation is issued to steady state (SS) and first control circuit 32 and controls exciting current to be issued to the mode of steady state (SS) consistent flowing to certain situation, therefore is no longer described in detail this.
Be understandable that, because the characteristic of sensor 48 self is known, sensor 48 in use needs suitable carry out electric current to it and turn to, if this is because the electric current of sensor 48 be same flow always to time, easily make the performance of sensor 48 reduce, therefore need in good time carry out direction of current to sensor 48 and turn to.
A kind of field circuit that the embodiment of the present invention provides adds high pressure system, preset value is reached by controlling second source and the connection of sensor and the connection control exciting current of the 3rd power supply and sensor, and adopt exciting current testing circuit to detect the size of exciting current in real time, exciting current is made to reach steady state (SS) with the shorter time, with in prior art by compared with the mode that strengthens constant current source power supply voltage, field circuit provided by the invention adds high pressure system, effectively shorten the stabilization time of electromagnetic flowmeter exciting current, improve electromagnetic flowmeter sample frequency and sampling precision.
Please refer to Fig. 7, a kind of field circuit that it illustrates the embodiment of the present invention provides adds high pressure a kind of process flow diagram of method, is applied to above-mentioned field circuit and adds high pressure system, can comprise the following steps:
Step 101: when the first power input voltage signal, the first switch and the 4th switch conduction, when second switch and the 3rd switch disconnect, first controls source control second source is connected with sensor, and the exciting current making sensor flow to right-hand member by left end reaches preset value.
Step 102: adopt exciting current testing circuit to detect exciting current and whether reach preset value, if so, then perform step 103; If not, then step 101 is performed.
Step 103: when exciting current reaches preset value, the first control source controls second source and sensor disconnects.
Step 104: the first switch and the 4th switch disconnect, when second switch and the 3rd switch conduction, second controls source control the 3rd power supply is connected with sensor, and the exciting current making sensor flow to left end by right-hand member reaches preset value.
Step 105: adopt field circuit testing circuit to detect exciting current and whether reach preset value, if so, then perform step 106; If not, then step 104 is performed.
Step 106: when exciting current reaches preset value, the second control source controls the 3rd power supply and sensor disconnects, then continue to perform step 101.
It should be noted that, when the first power input voltage signal, circuit turn-on.At the first switch and the 4th switch conduction, when second switch and the 3rd switch disconnect, when the first control source is high level, first controls source control second source is connected with sensor, make the exciting current of sensor flow to right-hand member by left end, and make exciting current reach steady state (SS) in the short period of time.Adopt exciting current testing circuit to detect exciting current simultaneously and whether reach preset value, when exciting current reaches preset value, low level is reduced to by high level in the first control source, and first controls source when low level, and control second source and sensor disconnect.If exciting current does not also reach preset value, then continue the flow direction keeping exciting current.
In order to reduce the performance loss of sensor, need the exciting current of sensor to carry out Flow reverse.Therefore need the first switch in H-bridge drive circuit and the 4th switch to disconnect, second switch and the 3rd switch conduction, and when the second control source is high level, the second control source controls the 3rd power supply and is connected with sensor, makes the exciting current of sensor flow to left end by right-hand member and reaches steady state (SS).Adopt exciting current testing circuit to detect exciting current simultaneously and whether reach preset value, when exciting current reaches preset value, low level is reduced to by high level in second control source, second controls source when low level, control the 3rd power supply and sensor disconnects, continue the flow direction of conversion sensor exciting current.If exciting current does not also reach preset value, then continue the flow direction keeping exciting current.
It should be noted that, preset value is before field circuit conducting state, and according to the exciting current value that the performance of sensor is arranged, the performance of it and sensor is closely bound up.
A kind of field circuit provided in the embodiment of the present invention adds high pressure in method, when the first switch and the 4th switch conduction, when second switch and the 3rd switch disconnect, the first control source in first control circuit is high level by controlling high voltage control signal, in first control circuit, second source is connected conducting with sensor, the electric current controlling sensor flows to B by A end and holds, and control exciting current and be in steady state (SS), detect exciting current by field circuit testing circuit and whether reach preset value, if after exciting current reaches preset value, first control source controls high voltage control signal and becomes low level from high level, high voltage control signal again by being in high level in the second control source control second control circuit controls the 3rd power supply and is connected with sensor, with at second switch and the 3rd switch conduction, when first switch and the 4th switch disconnect, the electric current controlling sensor flows to A by B end and holds, and reach steady state (SS), circulate successively, interval time section the flow direction of change exciting current, to avoid the damage of sensor performance.
A kind of field circuit that the embodiment of the present invention provides adds high pressure method, first control circuit and the second source in second control circuit and the 3rd power supply is directly utilized to be connected with sensor or off-state controls the flow direction of exciting current, exciting current is made to reach steady state (SS) in the short period of time, and adopt exciting current testing circuit to detect the size of exciting current in real time, with in prior art by compared with the mode that strengthens constant current source power supply voltage, field circuit provided by the invention adds high pressure system, effectively shorten the stabilization time of electromagnetic flowmeter exciting current, improve electromagnetic flowmeter sample frequency and sampling precision.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, those skilled in the art are realized or uses the present invention.To be apparent for a person skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. field circuit adds high pressure a system, is applied to electromagnetic flowmeter, it is characterized in that, comprising:
First control circuit, second control circuit, exciting current testing circuit and H-bridge drive circuit;
Described first control circuit comprises second source, and described second control circuit comprises the 3rd power supply; Described H-bridge drive circuit comprises sensor;
Described first control circuit, for controlling connection and the disconnection of described second source and described sensor;
Described second control circuit, for controlling connection and the disconnection of described 3rd power supply and described sensor;
Described exciting current testing circuit, for detecting the size of exciting current and preset value;
Described first control circuit is connected with described H-bridge drive circuit, and described H-bridge drive circuit is connected with described second control circuit, and described H-bridge drive circuit is connected with described field circuit testing circuit.
2. system according to claim 1, is characterized in that, described H-bridge drive circuit also comprises:
First power supply, constant current source, the first diode, the first switch, second switch, the 3rd switch and the 4th switch;
Being connected with described first power supply of described constant current source, being connected with the positive pole of described first diode of described constant current source, the negative pole of described first diode is connected with the tie point of described second switch with described first switch, described sensor is connected with the tie point of described first switch with described 3rd switch, described sensor is connected with the tie point of described second switch with described 4th switch, and described 4th switch is connected with described 3rd switch.
3. system according to claim 1, is characterized in that, described first control circuit also comprises:
First controls source, the first triode, the second diode, the first resistance, the second resistance, the 3rd resistance, the 3rd triode, the 4th resistance and the 5th resistance;
Described 4th resistance and described first controls source and is connected, described 4th resistance is connected with the tie point of described 5th resistance with described 3rd transistor base, described 5th resistance is connected with ground wire, the emitter of described 3rd triode is connected with described ground wire, the collector of described 3rd triode is connected with described 3rd resistance, described 3rd resistance is connected with described second resistance, described second resistance is connected with the base stage of described first triode, the collector of described first triode is connected with the positive pole of described second diode, the negative pole of described second diode is connected with described H-bridge drive circuit, the emitter of described first triode is connected with second source, and described first resistance is connected with the emitter of described first triode, and described first electronics is connected with described 3rd resistance.
4. system according to claim 1, is characterized in that, described second control circuit also comprises:
Second controls source, the second triode, the 3rd diode, the 6th resistance, the 7th resistance, the 8th resistance, the 4th triode, the 9th resistance and the tenth resistance;
Described 9th resistance and the described 3rd controls source and is connected, described 9th resistance is connected with the tie point of described tenth resistance with described 4th transistor base, described tenth resistance is connected with ground wire, the emitter of described 4th triode is connected with described ground wire, the collector of described 4th triode is connected with described 8th resistance, described 8th resistance is connected with described 7th resistance, described 7th resistance is connected with the base stage of described second triode, the collector of described second triode is connected with the positive pole of described 3rd diode, the negative pole of described 3rd diode is connected with described H-bridge drive circuit, the emitter of described second triode is connected with the 3rd power supply, and described 6th resistance is connected with the emitter of described second triode, and described first electronics is connected with described 8th resistance.
5. system according to claim 1, is characterized in that, described exciting current testing circuit comprises:
Amplifier, the 11 resistance and the 4th power supply;
Described 11 resistance is connected with ground wire, and described 11 resistance is connected with the in-phase input end of described amplifier, and the reverse input end of described amplifier is connected with the output terminal of described amplifier, and the output terminal of described amplifier is connected with described 4th power supply; Described 11 resistance is connected with described H-bridge drive circuit with the intersection point of the in-phase input end of described amplifier.
6. field circuit adds high pressure a method, and the field circuit be applied to described in any one of claim 1-5 adds high pressure system, it is characterized in that, comprising:
Step 1: when described first power input voltage signal, described first switch and described 4th switch conduction, when described second switch and described 3rd switch disconnect, described first control source controls described second source and is connected with described sensor, and the exciting current making described sensor flow to right-hand member by left end reaches preset value;
Step 2: adopt exciting current testing circuit to detect described exciting current and whether reach preset value, if so, then performs step 3; If not, then step 1 is performed;
Step 3: when described exciting current reaches preset value, described first control source controls described second source and described sensor disconnects;
Step 4: described first switch and described 4th switch disconnect, when described second switch and described 3rd switch conduction, described second controls source described 3rd power supply of control is connected with described sensor, and the exciting current making described sensor flow to left end by right-hand member reaches preset value;
Step 5: adopt described field circuit testing circuit to detect described exciting current and whether reach preset value, if so, then performs step 6; If not, then step 4 is performed;
Step 6: when described exciting current reaches described preset value, described second control source controls described 3rd power supply and described sensor disconnects, then continue to perform step 1.
7. method according to claim 6, is characterized in that, described step 1 comprises:
When described first control source is high level, described first control source controls described second source and is connected with described sensor, and the described exciting current making described sensor flow to right-hand member by left end reaches described preset value.
8. method according to claim 6, is characterized in that, described step 3 comprises:
When described exciting current reaches preset value, low level is reduced to by high level in described first control source;
Described first controls source when low level, controls described second source and described sensor disconnects.
9. method according to claim 6, is characterized in that, described step 4 comprises:
When described second control source is high level, described second controls source described 3rd power supply of control is connected with described sensor, and the described exciting current making described sensor flow to left end by right-hand member reaches described preset value.
10. method according to claim 6, is characterized in that, described step 6 comprises:
When described exciting current reaches preset value, low level is reduced to by high level in described second control source;
Described second controls source when low level, controls described 3rd power supply and described sensor disconnects.
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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104634398A true CN104634398A (en) | 2015-05-20 |
| CN104634398B CN104634398B (en) | 2019-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410797070.4A Active CN104634398B (en) | 2014-12-19 | 2014-12-19 | A kind of excitation circuit adds high pressure system and method |
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| CN (1) | CN104634398B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105277241A (en) * | 2015-11-26 | 2016-01-27 | 重庆川仪自动化股份有限公司 | Excitation acceleration circuit for electro-magnetic flow meter and excitation acceleration method |
| CN105841761A (en) * | 2016-05-28 | 2016-08-10 | 上海大学 | Constant flow controlling system for exciting coil of variable frequency electromagnetic flow meter |
| CN112394244A (en) * | 2019-08-19 | 2021-02-23 | 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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| 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277241A (en) * | 2015-11-26 | 2016-01-27 | 重庆川仪自动化股份有限公司 | Excitation acceleration circuit for electro-magnetic flow meter and excitation acceleration method |
| 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 |
| CN105841761A (en) * | 2016-05-28 | 2016-08-10 | 上海大学 | Constant flow controlling system for exciting coil of variable frequency electromagnetic flow meter |
| 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 |
| CN112394244A (en) * | 2019-08-19 | 2021-02-23 | 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 |
| 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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|---|---|
| CN104634398B (en) | 2019-01-08 |
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