CN100538095C - A kind of switch power amplifier that is used for magnetic bearing system based on space vector technique - Google Patents
A kind of switch power amplifier that is used for magnetic bearing system based on space vector technique Download PDFInfo
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- CN100538095C CN100538095C CNB2007101207057A CN200710120705A CN100538095C CN 100538095 C CN100538095 C CN 100538095C CN B2007101207057 A CNB2007101207057 A CN B2007101207057A CN 200710120705 A CN200710120705 A CN 200710120705A CN 100538095 C CN100538095 C CN 100538095C
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- magnetic bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
Abstract
A kind of switch power amplifier that is used for magnetic bearing system based on space vector technique, be a kind of device that is used for the electric current in the magnetic bearing coil is carried out ACTIVE CONTROL, it mainly comprises controller, isolated drive circuit, three brachium pontis power main circuits, current detection circuit, conditioning circuit and A/D chip.This digital switch power amplifier is carried out modulating based on the PWM of space vector technique according to current sampling data and the error of setting current value by controller, the pwm signal that modulation is finished is controlled the conducting and the shutoff of power switch pipe in the three brachium pontis power main circuits through isolated drive circuit again, thereby reaches the purpose of control magnetic bearing coil current.The present invention has realized a kind of digital switch power amplifier that is applicable to magnetic suspension flywheel magnetic bearing system, has the advantage that power tube is few, low in energy consumption, current ripples is little.
Description
Technical field
The present invention relates to a kind of switch power amplifier, is a kind of switch power amplifier based on space vector technique that is used for magnetic bearing system, is used for the output current of magnetic bearing coil is controlled.
Background technique
Magnetically levitated flywheel has no rotating speed zero passage friction with respect to traditional mechanical bearing flywheel and can carry out the advantage of Active Vibration Control, so have broad application prospects on the highi degree of accuracy satellite.Power amplifier is as the final controlling element of magnetic levitation flywheel magnetic bearing control system, its energy consumption maximum, and improving level of integration, increasing reliability is one of main purpose of Designing power amplifier.In order to improve the efficient of power amplifier, the magnetic levitation flywheel magnetic bearing control system generally adopts switch power amplifier.Produce the implementation difference of circuit according to pulse width modulating signal, magnetic bearing is divided into switch power amplifier that analog device is realized and two kinds of Digital Implementation.
At Chinese patent " ZL200510012131.2 " disclosed " a kind of low-ripple switch power amplifier that is used for permanent magnet biased electromagnetic-bearing ", adopt analog device to realize the function of three level pulse widths modulation, reduced the ripple loss.But there are shortcomings such as power consumption is big, level of integration is low, modulation system is dumb in the power amplifier that adopts analog device to realize.
Existing magnetic bearing based on Digital Implementation is used in the switch power amplifier: in Chinese patent " ZL200510011972.1 " disclosed " a kind of integrated, device in low power dissipation for digital controlling magnetic bearing ", adopting monolithic DSP2812 is controller, realize the function of two level pulse widths modulation by inner PWM module, it is simple in structure, and method is easy to realize; But its pwm signal output number based on the switch power amplifier that monolithic DSP realizes is limited, and the PWM modulation system is fixed, the occasion of be difficult to satisfy the demand multi-channel PWM signal, drive.
At Chinese patent application number " 200610114390.0 " disclosed " a kind of switch power amplifier that is used for magnetic suspension flywheel magnetic bearing system ", employing FPGA+DSP is a controller, adopts ternary PWM modulation system, and data-handling capacity is strong, and current ripples is little; But it adopts at following two power switch pipe source electrodes of bridge with between with reference to ground and is connected in series noninductive power resistor respectively, when being controlled at the loop afterflow by FPGA current signal is sampled, the control mode complexity, and programming realizes difficulty.
Simultaneously above-mentioned switch power amplifier adopts is full bridge structure, as shown in Figure 1.Coil of control all needs 4 power tubes under this mode, need control 5 coils to the magnetic bearing system of 5 passages, promptly needs 20 power tubes, causes volume and power consumption all to increase to some extent.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiency that prior art exists, a kind of switch power amplifier that is used for magnetic bearing system based on space vector technique is provided, employing is based on the debud mode of space vector technique, reduced the quantity of power tube, improved level of integration, reduced volume and power consumption, it is fast to have speed of response simultaneously, the programming flexible characteristic; Adopt the current detection circuit of place of current mutual inductor, the testing precision height, it is adjustable to detect multiple, and detection mode is simple, is easy to realize.
Technical solution of the present invention: a kind of switch power amplifier of magnetic suspension flywheel magnetic bearing system based on space vector technique, mainly comprise controller, AD chip, isolated drive circuit, three brachium pontis power main circuits, current detection circuit and conditioning circuit, wherein:
Controller: two-way current feedback signal and the corresponding given signal of electric current that the AD chip is sent here is poor, direction and size according to two differences, decision needs the electric current of output to regulate residing interval of vector and the corresponding ON time that goes up three pipes of brachium pontis, the ON time value corresponding and the triangular carrier that obtain are compared, obtain the PWM waveform of three pipes of brachium pontis, the PWM waveform of three pipes of following brachium pontis is obtained after anti-phase and dead band logic by the PWM waveform of three pipes of last brachium pontis;
Isolated drive circuit: output is joined with three brachium pontis power main circuits, is used for generating the gate drive signal of three brachium pontis power main circuit power switch pipes;
Three brachium pontis power main circuits: the gate drive signal by isolated drive circuit output is controlled the conducting and the shutoff of going up brachium pontis and six power switch pipes of following brachium pontis, exports thereby generate in two magnetic bearing coils with the proportional electric current of Current Control amount;
Two current detection circuits: output is joined with conditioning circuit, and input is joined with three brachium pontis power main circuits, is respectively applied for two magnetic bearing coil current feedback signals that detect three brachium pontis power main circuits;
Conditioning circuit: output is joined with the A/D chip, is used for the current feedback signal of two current detection circuit outputs is carried out level deviation and lower pass-filter;
The A/D chip: output is joined with controller, under the control of FPGA, the two-way current feedback signal of conditioning circuit output is sampled in controller.
Control principle of the present invention: for the magnetic levitation flywheel magnetic bearing switch power amplifier, by (turn-on and turn-off of VT1～VT6) are controlled to six power switch pipes on three brachium pontis of novel topological structure full-bridge main circuit, can control conducting and the shutoff of two magnetic bearing coil L1 and L2 simultaneously, wherein require the signal of VT1～VT6 correspondence: S1 and S4, S2 and S5, S3 and S6 are anti-phase.Get different value (0 or 1) by S1, S2 and S3, can be combined into 8 kinds of states, comprising six non-zero vectors and two zero vectors, the space voltage vector of each on off state correspondence is synthetic by two adjacent coil voltage vectors.Its space distribution as shown in Figure 4.For example: in Fig. 4, if the reference voltage regulated quantity u of expectation
x0, and u
y0 (promptly wish the adjusting of x direction forward, y direction forward is regulated), then reference voltage vector V
RefDrop on the III zone, then V
RefAction effect can pass through adjacent basic vector V
4And V
6Effect synthetic, that is: V
Ref=T
4* V
4+ T
6* V
6V wherein
4Endurance be T
4, V
6Endurance be T
6The sequence of operation of each basic voltage vectors because the embodiment of the invention adopts symmetric space vector pulse width modulation mode, in the beginning and the ending phase of each switch periods, is zero vector V as shown in Figure 5
0Action time: t
0/ 4, and the interlude section of switch periods is zero vector V
7Action time: t
0/ 2, two other non-zero basic voltage vectors will be divided into two-part and be distributed in zero vector V symmetrically
7The left and right sides.For the V among Fig. 4
Ref=T
4* V
4+ T
6* V
6, as shown in Figure 5, the time that (S1 S2 S3) gets (100) is T
4With the time of getting (110) be T
6Get final product, also promptly: the width of S1 pulse is: T
4+ T
6+ t
0/ 2=t
1+ t
2+ t
0/ 2; The width of S2 pulse is: T
6+ t
0/ 2=t
2+ t
0/ 2; The width of S3 pulse is: t
0/ 2.T wherein
0Be the action time of zero vector, t
1And t
2Be V
RefCorresponding two the non-zero vectors (100) and the action time of (110), t
1And t
2Size by V
RefSize and Orientation decision.In like manner can obtain the realization of the space vector under other states.Control by to various states and its state duration (ON time) can realize the control to the magnetic bearing coil current.
The present invention realizes with existing analog device or the magnetic bearing of Digital Implementation is compared with switch power amplifier, and advantage is:
(1) the present invention is by adopting the topological structure of vector control technology and novel three brachium pontis power main circuits, utilize six power tubes independently to control two coil currents, the power tube that the magnetic bearing system of 5 coils of control is needed is reduced to 16 by 20, and (two three brachium pontis full-bridge main circuits are controlled x, the y direction of upper and lower end respectively, need 12 power tubes; Full bridge structure main circuit Control Shaft to, need 4 power tubes, totally 16 power tubes), reduced the quantity of power tube, improved level of integration, reduced ripple, reduced volume and power consumption.
(2) the present invention adopts the high-speed figure controller to carry out space vector modulation, and it is fast to have a system response time, the programming flexible characteristic.
(3) the current detection circuit testing precision height of She Ji place of current mutual inductor, it is adjustable to detect multiple, and detection mode is simple, is easy to realize.
Description of drawings
Fig. 1 is the full bridge structure figure of existing single coil;
Fig. 2 is a hardware composition frame chart of the present invention;
Fig. 3 is that controller of the present invention is formed and flow chart;
Fig. 4 is the output basic vector figure of switch power amplifier of the present invention;
Fig. 5 is the sequence of operation and the corresponding switching signal figure of each regional basic voltage vectors of the present invention;
Fig. 6 is a means of space vector representation flow chart of the present invention;
Fig. 7 is the current detection circuit of a passage of the present invention.
Embodiment
As shown in Figure 2, the present invention mainly comprises controller 1, isolated drive circuit 2, three brachium pontis power amplifier main circuits 3, current detection circuit 4, conditioning circuit 5 and A/D chip 6.The sampling that AD chip 6 is realized current feedback signal, sampled result is transferred to controller 1; Controller 1 is made the error signal that difference obtains the electric current adjusting with electric current setting value and currrent feedback value, two error signals according to two coil correspondences, generate three road comparison values by means of space vector representation, the count value of three road comparison values and triangular carrier is compared, obtain the PWM1～PWM3 signal of three pipes of brachium pontis, add anti-phase and the dead band logic to three road pwm signals simultaneously, obtain down the PWM4～PWM6 signal of three pipes of brachium pontis; Generate the gate drive signal of the power switch pipe of three brachium pontis power amplifier main circuits 3: S1～S6 through isolated drive circuit 2, wherein S1 and S4, S2 and S5, S3 and S6 are anti-phase respectively, conducting and shutoff by S1～six power switch pipes of S6 control, current detection circuit 4 obtains the current feedback signal of coil by detecting the voltage drop value on the power resistor Rf in the three brachium pontis power amplifier main circuits 3.
Wherein VT1 and VT4 constitute brachium pontis A; VT2 and VT5 constitute brachium pontis B; VT3 and VT6 constitute brachium pontis C, magnetic bearing coil L1 and magnetic bearing coil L2 are connected between A brachium pontis and B brachium pontis respectively and between B brachium pontis and C brachium pontis, be that brachium pontis B is the public brachium pontis of two magnetic bearing coils, the drive signal S1 of upper end power tube, S2, S3 lead directly to preventing with drive signal S4, S5, the S6 of lower end power tube are anti-phase respectively.The power resistor Rf of a little resistance of polyphone among magnetic bearing coil L1 and the magnetic bearing coil L2, Rf＜0.1R1 or Rf＜0.1R2, the electric current that current detection circuit 4 is adopted by the way Test coil of detection power resistance drop replaces traditional electric current detecting method that makes Current Transformer.
As shown in Figure 3, controller 1 of the present invention is made up of FPGA and DPS.FPGA is made of AD sampling control module and PWM generation module, and current feedback signal is connected to the AD sampling control module of FPGA, and FPGA requires to be provided with corresponding sequential logic according to the sequential of AD sampling control module, and then the sampling of control AD sampling control module; After sampling finished, sampled result was temporarily stored in the register of FPGA, generated the sampling end interrupt simultaneously, and notice DSP takes sampled result away; DSP is made up of position signal control algorithm and space vector algorithm, after DSP carries out control algorithm to the magnetic bearing position error signal, generate the electric current setting value, the sampled value of electric current setting value and current feedback signal is done to obtain error amount after the difference, and this error amount is promptly represented the size of the voltage-regulation vector of expectation; DSP is according to the size and Orientation of two channel error values, and the application space vector method calculates the ON time of brachium pontis three pipes, and ON time is changed into the PWM generation module that corresponding comparison value is delivered to FPGA; The PWM generation module generation cycle of FPGA is the triangular carrier counting of T, three comparison values that DSP sends here compare with the triangular carrier count value respectively, if comparison value carries count value greater than triangle, then export high level, otherwise output low level then, obtain the pwm signal PWM1～PWM3 of brachium pontis three pipes thus, the signal PWM4～PWM6 of following brachium pontis three pipes is obtained after time-delay of the dead band of FPGA generation and inverted logic by PWM1～PWM3.
As shown in Figure 4, (S1 and S4, S2 and S5, S3 and S6 are anti-phase respectively according to the state of S1, S2 and S3, be convenient to simplify the state of only considering S1, S2 and S3 during analysis), three brachium pontis can be combined into eight kinds of on off states, comprising six non-zero vectors and two zero vectors.The voltage u on the magnetic bearing coil that is connected between brachium pontis mid point A, B
ABThe x axle of being used as the xy plane is the voltage u on the magnetic bearing coil that is connected between brachium pontis mid point B, the C
BCThe y axle of being used as the xy plane, eight kinds of on off states (000), (001) ..., (111) respectively corresponding eight basic voltage vectors V of output
0, V
1..., V
7Middle V
0And V
7Be two no-voltage vectors, V
1～V
6Totally six basic voltage vectors are non-zero vectors, and these six basic voltage vectors are divided into six zones (area I～regional VI) to the xy plane, eight kinds of on states of eight kinds of corresponding two magnetic bearing coils of fundamental space vector.The space voltage vector of each on off state correspondence is synthetic by two adjacent basic voltage vectors.
Owing to three kinds of states can occur on two magnetic bearing coils of employing three brachium pontis power amplifier main circuits: charged state, discharge condition and free afterflow state, so power amplifier can be realized low ripple current output; And,, can reduce switching loss so reduced the number of power switch pipe because power tube VT2 and VT5 are the public pipe of two magnetic bearing coils.
As shown in Figure 5, the sequence of operation of each regional basic voltage vectors of the present invention and corresponding switching signal relation.Sequence of operation according to the obstructed selection of zero vector and each basic voltage vectors is different, and means of space vector representation can be divided into symmetric space vector pulse width modulation mode and asymmetric space vector pulse width modulation mode.Adopt symmetric space vector pulse width modulation mode in this enforcement, promptly sequence of operation and the time of each basic vector in each switch periods is symmetrically distributed, and each the road pulse-width signal that is produced also is symmetrical.In Fig. 5: t
0Be the time of zero vector effect; t
1And t
2Be respectively two basic vector action times in zone of living in.In the beginning and the ending phase of each switch periods, be zero vector V
0Action time: t
0/ 4, and the interlude section of switch periods is zero vector V
7Action time: t
0/ 2, two other non-zero basic voltage vectors will be divided into two-part and be distributed in zero vector V symmetrically
7The left and right sides, and the conversion that guarantees each on off state all has only one to change, and promptly when when a kind of on off state is transformed into another kind of on off state, has only the switching tube of a brachium pontis to move, can reduce the switch number of times like this, reach the purpose that reduces switching loss.
As shown in Figure 6, means of space vector representation is for adapting to the means of space vector representation of magnetic bearing three brachium pontis power main circuit structure characteristics.Because being unlike in the speed control system, close power amplifier institute output voltage vector rotates regularly clockwise or counterclockwise like that always, but do the redirect of randomness, may jump in other the zone in non-adjacent zone from a zone, and the sequence of operation of basic voltage vectors becomes corresponding corresponding relation with switching signal in each zone.Therefore, need obtain the voltage-regulation vector (being the error amount of two passages) of two coil expectations in real time herein; And then determine the residing interval of output voltage vector according to the error amount of two passages; Obtain the ON time of three power tubes in upper end according to corresponding interval of living in; Convert the ON time that obtains to three comparison values and send into FPGA, compare with the triangular carrier count value of FPGA, and then obtain pwm signal.
T among Fig. 6 is the triangular carrier count cycle count value of FPGA, and T gets 1000 in the present embodiment, and promptly the dominant frequency owing to FPGA in the present embodiment is 40MHz, so carrier cycle is 40M/ (1000+1000)=20KHz.The DSP basis is judged zone of living in (area I～regional VI) to the error amount of two passages, and calculates t
1, t
2And t
0If t
1+ t
2N*T, t
1=n*T*t
1/ (t
1+ t
2), t
2=n*T*t
2/ (t
1+ t
2), t
0=T-t
1-t
2If t
1+ t
2＜n*T, t
1, t
2Constant.The coefficient n that wherein chooses is no more than n for the dutycycle maximum is set, and the value of n is generally 0.8～0.95, and n gets 0.95 in the present embodiment, and promptly maximum duty cycle is made as 95%.Then, according to the sequence of operation of each regional basic voltage vectors shown in Figure 4 and corresponding switching signal relation, obtain three comparison value CMP1, CMP2 and CMP3 and send into FPGA and be used to produce pwm signal.Below be example explanation means of space vector representation working procedure with the actual numerical value:
Suppose that two channel error values after DPS calculates are respectively: x=-300, y=400, the time of promptly expecting the conducting of x direction coil negative sense is 300/T, the time of y direction coil forward conduction is 400/T, and from three brachium pontis main circuits as can be seen: the time that (S1 S2 S3) gets (010) is: 300/T with the time of getting (110) is: 100/T can reach the requirement of expectation.The space vector that can learn expectation from Fig. 5 is positioned at the II zone.Since the corresponding ON time of two error amounts and less than n*T, so obtain t
1=300, t
2=100, t
0=1000-100-300=600.Can obtain comparison value according to Fig. 5:
CMP1＝t
2+0.5＊t
0＝400；
CMP2＝t
1+t
2+0.5＊t
0＝700；
CMP3＝0.5t
0＝300；
The above comparison value that obtains is sent into the pwm signal that relatively can obtain brachium pontis three pipes among the FPGA with triangular carrier.
As shown in Figure 7, provided current detection circuit 4 of the present invention.Wherein: adopt instrument to amplify chip AD620 the voltage difference at power resistor two ends is amplified, magnification factor is determined by adjustable potentiometer W2.Because the AD620 input end is connected between two brachium pontis of full-bridge main circuit, its detection voltage difference is the pressure drop on the power resistor.In the present embodiment, coil resistance is about 3 Ω, the resistance of getting power resistor Rf is 0.1 Ω, voltage drop value on the power resistor is smaller, but the power resistor two ends (connect the AD620 chip-IN and+the IN pin) absolute value of voltage is bigger, so adopt isolating chip ISO122 to carry out the voltage isolation in the present embodiment, the output value after the isolation is with respect to the voltage drop value on the power resistor on ground, this output value feeds back to the AD chip by signal conditioning circuit, waits for sampling.
The present invention is a kind of switch power amplifier based on space vector technique of magnetic bearing system, can be applied to magnetic bearing-supported flywheel system, the switch power amplifier that also can be used as a kind of general magnetic bearing system is applied in the magnetic bearing control system of other types.
Claims (5)
1, a kind of switch power amplifier that is used for magnetic bearing system based on space vector technique, it is characterized in that comprising: controller (1), isolated drive circuit (2), three brachium pontis power main circuits (3), current detection circuit (4), conditioning circuit (5), AD chip (6), wherein:
Controller (1): finish the sampling control of AD chip (6) to two magnetic bearing channel current feedback signals, error by given signal of electric current and current feedback signal is carried out the PWM modulation by means of space vector representation, the pwm signal of output: PWM1～PWM6 delivers to isolated drive circuit (2);
Isolated drive circuit (2): output is joined with three brachium pontis power main circuits (3), is used for generating three brachium pontis power main circuit (3) power switch pipes (gate drive signal of VT1～VT6) (S1～S6);
Three brachium pontis power main circuits (3): (brachium pontis and six power switch pipes of following brachium pontis are gone up in the control of S1～S6), and (conducting and the shutoff of VT1～VT6) are exported thereby generate in two magnetic bearing coils with the proportional electric current of Current Control amount by the gate drive signal of isolated drive circuit (2) output;
Two current detection circuits (4): output is joined with conditioning circuit (5), and input is joined with three brachium pontis power main circuits (3), is respectively applied for two magnetic bearing coil current feedback signals that detect three brachium pontis power main circuits (3);
Conditioning circuit (5): output is joined with AD chip (6), is used for the current feedback signal of two current detection circuits (4) output is carried out level deviation and lower pass-filter;
AD chip (6): output is joined with controller (1), under the control of FPGA, the two-way current feedback signal of conditioning circuit (5) output is sampled in controller (1).
2, a kind of switch power amplifier that is used for magnetic bearing system based on space vector technique according to claim 1, it is characterized in that: described controller (1) is made up of FPGA and DSP, FPGA is made of AD sampling control module and PWM generation module, current feedback signal is connected to the AD sampling control module of FPGA, FPGA requires to be provided with corresponding sequential logic according to the sequential of AD sampling control module, and then the sampling of control AD sampling control module; After sampling finished, sampled result was temporarily stored in the register of FPGA, generated the sampling end interrupt simultaneously, and notice DSP takes sampled result away; DSP is made up of position signal control algorithm and space vector algorithm, after DSP carries out control algorithm to the magnetic bearing position error signal, generate the electric current setting value, the sampled value of electric current setting value and current feedback signal is done to obtain error amount after the difference, and this error amount is promptly represented the size of the voltage-regulation vector of expectation; DSP is according to the size and Orientation of two channel error values, and the application space vector method calculates the ON time of brachium pontis three pipes, and ON time is changed into the PWM generation module that corresponding comparison value is delivered to FPGA; The PWM generation module generation cycle of FPGA is the triangular carrier counting of T, three comparison values that DSP sends here compare with the triangular carrier count value respectively, if comparison value carries count value greater than triangle, then export high level, otherwise output low level then, obtain the pwm signal PWM1～PWM3 of brachium pontis three pipes thus, the signal PWM4～PWM6 of following brachium pontis three pipes is obtained after time-delay of the dead band of FPGA generation and inverted logic by PWM1～PWM3.
3, a kind of switch power amplifier that is used for magnetic bearing system based on space vector technique according to claim 2, it is characterized in that: described means of space vector representation is: obtain the voltage-regulation vector of two coil expectations in real time, i.e. the error amount of two passages; And then determine the residing interval of output voltage vector according to the error amount of two passages; Obtain the ON time of three power tubes in upper end according to corresponding interval of living in; Convert the ON time that obtains to three comparison values and send into FPGA, compare with the triangular carrier count value of FPGA, and then obtain pwm signal.
4, a kind of switch power amplifier that is used for magnetic bearing system based on space vector technique according to claim 1, it is characterized in that: described three brachium pontis power main circuits (3) adopt six power tubes independently to control the topological structure of two coils, and wherein first power tube (VT1) constitutes first brachium pontis (A) with the 4th power tube (VT4); Second power tube (VT2) constitutes second brachium pontis (B) with the 5th power (VT5); The 3rd power tube (VT3) constitutes the 3rd brachium pontis (C) with the 6th power tube (VT6), the first magnetic bearing coil (L1) and the second magnetic bearing coil (L2) are connected between first brachium pontis (A) and second brachium pontis (B) respectively and between brachium pontis (B) and the 3rd brachium pontis (C), promptly second brachium pontis (B) is the public brachium pontis of two magnetic bearing coils, and the drive signal of upper end power tube (S1, S2, S3) leads directly to preventing with the drive signal (S4, S5, S6) of lower end power tube is anti-phase respectively.
5, a kind of switch power amplifier that is used for magnetic bearing system based on space vector technique according to claim 4, it is characterized in that: the power resistor Rf of a little resistance of polyphone in the described first magnetic bearing coil (L1) and the second magnetic bearing coil (L2), Rf＜0.1R1 or Rf＜0.1R2, wherein R1 and R2 are respectively the resistance value of the first magnetic bearing coil L1 and the second magnetic bearing coil L2.
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| CNB2007101207057A CN100538095C (en) | 2007-08-24 | 2007-08-24 | A kind of switch power amplifier that is used for magnetic bearing system based on space vector technique |
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