CN101328948A - Driver of magnetic current damper - Google Patents
Driver of magnetic current damper Download PDFInfo
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- CN101328948A CN101328948A CNA2008101170786A CN200810117078A CN101328948A CN 101328948 A CN101328948 A CN 101328948A CN A2008101170786 A CNA2008101170786 A CN A2008101170786A CN 200810117078 A CN200810117078 A CN 200810117078A CN 101328948 A CN101328948 A CN 101328948A
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- damper
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Abstract
The invention discloses a driver of a magnetorheological damper, comprising a voltage-current conversion unit which converts control voltage to control current, and a power amplification unit which performs power amplification on the control current to drive the magnetorheological damper, wherein, the voltage-current conversion unit comprises an instrumentation amplifier, an operational amplifier and a converting resistor, wherein, an input end of the instrumentation amplifier receives the control voltage, while an output end of the instrumentation amplifier is connected to an input end of the power amplification unit; an inverse input end of the operational amplifier is connected with an output end of the operational amplifier, while the output end of the operational amplifier is connected with a reference voltage end of the instrumentation amplifier; one end of the converting resistor is connected with an output end of the power amplification unit, while a non inverting input end of the operational amplifier and the magnetorheological damper are respectively connected with an output end of the power amplification unit. In the invention, the control voltage is converted into the control current by the driver of the magnetorheological damper realized through integrated circuit components, and the control current is subject to the power amplification to drive the magnetorheological damper. The driver of the magnetorheological damper has the advantages of low cost, high precision, good linearity, simple debugging and quick response.
Description
Technical field
The present invention relates to the electronic circuit technology field, particularly relate to a kind of driver of magnetic current damper.
Background technique
MR damper is a kind of damping controllable devices, its working principle be regulate by damper the electric current of field coil, thereby change the rheological properties of magnetic flow liquid, and then change damping constant.MR damper have response time weak point, good stability, energy consumption low, bigger advantages such as damping force can be provided, be with a wide range of applications in fields such as vehicle, building and space flight.
The damping constant of MR damper is that therefore designing the current driver that is suitable for MR damper seems very important by the Current Control by field coil.MR damper is a system of response fast, and therefore the current driver supporting with it also should have the short response time.In addition, should satisfy good linear relationship between the output voltage of the controller of the output current of current driver and MR damper.
Researchers have in the past also designed the current driver at MR damper.It is the current driver that core is designed for MR damper with the microprocessor that the researcher is arranged, the researcher is also arranged with DSP (Digital Singnal Processor, DSP digital signal processor) developed controlled current driver, but these researchs or exploitation are all comparatively complicated, need cooperate with computer and cost higher; Also have the researcher to propose a kind of adjustable PWM (Pulse WidthModulation, pulsewidth modulation) closed loop control current amplifier, but components and parts are more, circuit is more complicated also, and the linearity of input output is not high.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of driver of magnetic current damper, to overcome the low defective of cost height, the linearity of driver of magnetic current damper in the prior art.
For achieving the above object, the technological scheme of the embodiment of the invention provides a kind of driver of magnetic current damper, and described driver comprises: the electric current and voltage converting unit is used for the control voltage transitions is the control electric current; Power amplification unit is used for described control electric current is carried out power amplification, to drive MR damper; Described electric current and voltage converting unit comprises: instrument amplifier, its input end receive described control voltage, and output terminal is connected to the input end of described power amplification unit; Operational amplifier, its inverting input is connected with output terminal, and output terminal is connected with the reference voltage end of described instrument amplifier; Transfer resistance, the one end is connected with the output terminal of described power amplification unit, and the other end is connected with described MR damper with the in-phase input end of described operational amplifier respectively.
Wherein, the gain of described instrument amplifier is set to 1.
Wherein, described power amplification unit comprises: power amplifier; First resistance, the one end is connected to the output terminal of described instrument amplifier, and the other end is connected to the in-phase input end of described power amplifier; Second resistance, the one end is connected to the in-phase input end of described power amplifier, the other end ground connection; The 3rd resistance, the one end is connected to the inverting input of described power amplifier, and the other end is connected to the output terminal of described power amplifier; The 4th resistance, the one end is connected to the inverting input of described power amplifier, the other end ground connection.
Wherein, the gain of described power amplification unit is set to 1.
Wherein, the value of described first resistance is identical with the value of the 3rd resistance, and the value of second resistance is identical with the value of the 4th resistance.
Wherein, the value of described first resistance, second resistance, the 3rd resistance and the 4th resistance is all identical.
Wherein, described instrument amplifier is AD620.
Wherein, the pin 1 of described AD620 and pin 8 open circuit.
Wherein, described operational amplifier is AD705.
Wherein, described power amplifier is LM3886.
Technique scheme only is an optimal technical scheme of the present invention, has following advantage: the driver of magnetic current damper of the embodiment of the invention by realizing with integrated circuit component, to control voltage transitions and be the control electric current, and described control electric current carried out power amplification, to drive MR damper, the cost of described driver of magnetic current damper is low, precision is high, the linearity is good, debugging is simple, response is fast.
Description of drawings
Fig. 1 is the structural representation of a kind of driver of magnetic current damper of the embodiment of the invention;
Fig. 2 is the structural drawing of a kind of driver of magnetic current damper of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The structural representation of a kind of driver of magnetic current damper of the embodiment of the invention comprises electric current and voltage converting unit 11 and power amplification unit 12 as shown in Figure 1, and wherein said electric current and voltage converting unit 11 is connected with power amplification unit 12.Electric current and voltage converting unit 11 is used for the control voltage transitions is the control electric current; Power amplification unit 12 is used for described control electric current is carried out power amplification, to drive MR damper.
Electric current and voltage converting unit 11 comprises instrument amplifier 111, operational amplifier 112 and transfer resistance 113, and wherein the input end of instrument amplifier 111 receives control voltage, and output terminal is connected to the input end of power amplification unit 12; The inverting input of operational amplifier 112 is connected with output terminal, and output terminal is connected with the reference voltage end of instrument amplifier 111; One end of transfer resistance 113 is connected with the output terminal of power amplification unit 12, and the other end is connected with MR damper with the in-phase input end of operational amplifier 112 respectively.
The structure of a kind of driver of magnetic current damper of the embodiment of the invention comprises electric current and voltage converting unit and power amplification unit two-part as shown in Figure 2.
The electric current and voltage converting unit comprises instrument amplifier 21, operational amplifier 22 and transfer resistance R
RefThe input end of instrument amplifier 21 receives control voltage V
x, the wherein input anode of instrument amplifier 21 and control voltage V
xAnodal V
In+Connect; The input cathode of instrument amplifier 21 and control voltage V
xNegative pole V
In-Connect.The output terminal of instrument amplifier 21 is connected to the input end of power amplification unit.Instrument amplifier 21 can be according to regulating resistance R
GThe size adjustment voltage gain.The inverting input of operational amplifier 22 is connected with output terminal, and output terminal is connected with the reference voltage end of instrument amplifier 21.Transfer resistance R
RefAn end be connected with the output terminal of power amplification unit, the other end is connected with MR damper with the in-phase input end of operational amplifier 22 respectively.
It is the instrument amplifier of AD620 that instrument amplifier 21 can adopt model, and AD620 is a cheap low power consumption, high-precision meter amplifier, only needs a non-essential resistance that 1～1000 voltage amplification factor just can be set.AD620 have increasing power supply voltage range (± 2.3V～± 18V), the maximum supply current that only needs 1.3mA.AD620 has good direct current and AC characteristic, nonlinearity is 0.004% to the maximum, offset voltage is 50 μ V to the maximum, the input offset drift is 0.6 μ V/ ℃ to the maximum, up to the bandwidth of 120 kHZ, only be the adjusting time of 15 μ s, these performance index make AD620 be widely used in high-accuracy data acquistion system.
The voltage gain formula of AD620 is:
Wherein G is gain, R
GFor being connected the non-essential resistance between pin 1 and the pin 8.The gain of AD620 is set to 1 in the present embodiment, promptly disconnect between the pin 1 of AD620 and the pin 8, so the equivalent resistance between pin 1 and the pin 8 be infinitely great gain G=1 of the AD620 of correspondence.
It is the operational amplifier of AD705 that operational amplifier 22 can adopt model, and its inverting input links to each other with output terminal, constitutes voltage follower, and promptly the output voltage of AD705 equates with the voltage of in-phase input end; The output terminal of AD705 is received the reference voltage end of AD620, thereby with V
O-Feed back to AD620, have: V
Ref=V
O-
Transfer resistance R
RefWith voltage transitions is that electric current offers MR damper afterwards.
Power amplification unit comprises power amplifier 23, resistance R 1, R2, R3, R4 and R5, capacitor C 0 and C1.One end of resistance R 1 is connected to the output terminal of instrument amplifier 21, and the other end is connected to the in-phase input end of power amplifier 23; One end of resistance R 2 is connected to the in-phase input end of power amplifier 23, the other end ground connection; One end of resistance R 3 is connected to the inverting input of power amplifier 23, and the other end is connected to the output terminal of power amplifier 23; One end of resistance R 4 is connected to the inverting input of power amplifier 23, the other end ground connection; One end of resistance R 5 is connected to the negative supply input end of power amplifier 23, and the other end is connected to the quiet control end of power amplifier 23; One end of capacitor C 0 is connected to the in-phase input end of power amplifier 23, and the other end is connected to the inverting input of power amplifier 23; The plus earth of capacitor C 1, negative pole are connected to the quiet control end of power amplifier 23; The output terminal of power amplifier 23 is connected to transfer resistance R
RefAn end.
It is the power amplifier of LM3886 that power amplifier 23 can adopt model, and LM3886 is a high performance Audio Frequency Amplifier, and continuous power output can reach 68W when load is 4 Ω, and the Total Harmonic Distortion (THD+N) that contains noise is less than 0.1%.The characteristics of LM3886 maximum are exactly powerful autoprotection function, have output short-circuit, under-voltage, overvoltage, cross protective function such as high temperature.LM3886 have good signal-to-noise (＞92dB), and have the extraordinary linearity, intermodulation distortion only is 0.004%.
The voltage V ' that the output terminal that is input as instrument amplifier 21 of power amplification unit is exported
x, be output as V
O+Resistance R 2 is the in-phase input end input resistance of power amplifier 23, constitutes bleeder circuit with resistance R 1; Capacitor C 0 is used to reduce the gain of power amplifier 23 at high band, prevent output transistor quasi saturation concussion, this electric capacity can also suppress the magnetic switch noise from the outside; Resistance R 4 is the inverting input input resistance of power amplifier 23, constitutes reverse feedback with resistance R 3, and closed loop gain is provided; Resistance R 5 is quiet resistance, allows to flow through the 0.5mA electric current from the pin of power amplifier 23, closes muting function; Capacitor C 1 is quiet electric capacity, can set the time constant of bigger switch muting function.
Power amplification unit can provide enough big output power, drives MR damper to produce enough strong electric current.The pass of input output is:
In the present embodiment, the gain of power amplification unit is set to 1, that is: V
O+=V '
xWhen being provided with, can make R1=R3, and R2=R4; Further can make R1=R2=R3=R4.
As can be seen from Figure 2, V
x=V
In--V
In+For coming the control voltage of self-controller, be so obtain the electric current that the driver of magnetic current damper of present embodiment offers MR damper:
Driver of the present invention is not only applicable to MR damper, and can be used for the circuit of other electromagnetic coil circuits and Current Control.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1, a kind of driver of magnetic current damper is characterized in that, described driver comprises:
The electric current and voltage converting unit is used for the control voltage transitions is the control electric current;
Power amplification unit is used for described control electric current is carried out power amplification, to drive MR damper;
Described electric current and voltage converting unit comprises:
Instrument amplifier, its input end receive described control voltage, and output terminal is connected to the input end of described power amplification unit;
Operational amplifier, its inverting input is connected with output terminal, and output terminal is connected with the reference voltage end of described instrument amplifier;
Transfer resistance, the one end is connected with the output terminal of described power amplification unit, and the other end is connected with described MR damper with the in-phase input end of described operational amplifier respectively.
2, driver of magnetic current damper according to claim 1 is characterized in that the gain of described instrument amplifier is set to 1.
3, driver of magnetic current damper according to claim 1 is characterized in that described power amplification unit comprises:
Power amplifier;
First resistance, the one end is connected to the output terminal of described instrument amplifier, and the other end is connected to the in-phase input end of described power amplifier;
Second resistance, the one end is connected to the in-phase input end of described power amplifier, the other end ground connection;
The 3rd resistance, the one end is connected to the inverting input of described power amplifier, and the other end is connected to the output terminal of described power amplifier;
The 4th resistance, the one end is connected to the inverting input of described power amplifier, the other end ground connection.
4, as driver of magnetic current damper as described in the claim 3, it is characterized in that the gain of described power amplification unit is set to 1.
5, as driver of magnetic current damper as described in the claim 4, it is characterized in that the value of described first resistance is identical with the value of the 3rd resistance, the value of second resistance is identical with the value of the 4th resistance.
6, as driver of magnetic current damper as described in the claim 5, it is characterized in that the value of described first resistance, second resistance, the 3rd resistance and the 4th resistance is all identical.
7, driver of magnetic current damper according to claim 1 is characterized in that described instrument amplifier is AD620.
8, as driver of magnetic current damper as described in the claim 7, it is characterized in that pin 1 and the pin 8 of described AD620 open circuit.
9, driver of magnetic current damper according to claim 1 is characterized in that described operational amplifier is AD705.
10, as driver of magnetic current damper as described in the claim 3, it is characterized in that described power amplifier is LM3886.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101170786A CN101328948B (en) | 2008-07-23 | 2008-07-23 | Driver of magnetic current damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101170786A CN101328948B (en) | 2008-07-23 | 2008-07-23 | Driver of magnetic current damper |
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| Publication Number | Publication Date |
|---|---|
| CN101328948A true CN101328948A (en) | 2008-12-24 |
| CN101328948B CN101328948B (en) | 2010-12-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879758A (en) * | 2012-09-18 | 2013-01-16 | 广东电网公司电力科学研究院 | Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer |
| CN103513695A (en) * | 2013-05-31 | 2014-01-15 | 浙江大学 | Current controller for magneto-rheological damper |
| CZ304636B6 (en) * | 2013-01-08 | 2014-08-13 | Vysoké Učení Technické V Brně | Magnetorheologic attenuator control circuit |
| CN104714416A (en) * | 2013-12-11 | 2015-06-17 | 北车大连电力牵引研发中心有限公司 | Current source circuit and semi-physical simulation system |
| CN111674220A (en) * | 2020-05-08 | 2020-09-18 | 江苏大学 | Small-delay numerical control current source circuit for magnetorheological damper and parameter determination method thereof |
-
2008
- 2008-07-23 CN CN2008101170786A patent/CN101328948B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879758A (en) * | 2012-09-18 | 2013-01-16 | 广东电网公司电力科学研究院 | Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer |
| CZ304636B6 (en) * | 2013-01-08 | 2014-08-13 | Vysoké Učení Technické V Brně | Magnetorheologic attenuator control circuit |
| CN103513695A (en) * | 2013-05-31 | 2014-01-15 | 浙江大学 | Current controller for magneto-rheological damper |
| CN104714416A (en) * | 2013-12-11 | 2015-06-17 | 北车大连电力牵引研发中心有限公司 | Current source circuit and semi-physical simulation system |
| CN111674220A (en) * | 2020-05-08 | 2020-09-18 | 江苏大学 | Small-delay numerical control current source circuit for magnetorheological damper and parameter determination method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101328948B (en) | 2010-12-15 |
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