CN111894979A - Multi-bridge arm switch power amplifier circuit with fault-tolerant function - Google Patents
Multi-bridge arm switch power amplifier circuit with fault-tolerant function Download PDFInfo
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- CN111894979A CN111894979A CN202010742732.3A CN202010742732A CN111894979A CN 111894979 A CN111894979 A CN 111894979A CN 202010742732 A CN202010742732 A CN 202010742732A CN 111894979 A CN111894979 A CN 111894979A
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- bridge arm
- load
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- load bridge
- diode
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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
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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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
- F16C32/0457—Details of the power supply to the electromagnets
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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
- F16C32/0459—Details of the magnetic circuit
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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
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0489—Active magnetic bearings for rotary movement with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
Abstract
The invention discloses a multi-bridge arm switch power amplifier circuit with a fault-tolerant function, which consists of a main circuit structure and a functional module structure, wherein the main circuit structure is electrically connected with the functional module structure; the main circuit structure comprises a common bridge arm, a five-phase load bridge arm, a load bridge arm fault switching circuit, a standby bridge arm and a common bridge arm fault switching circuit which are electrically connected in sequence. The invention can execute corresponding operation according to the fault detection result, thereby realizing reconstruction of the bridge arm structure in the whole circuit under the condition of the fault of the common bridge arm or the load bridge arm and finally realizing the fault-tolerant control of the six-bridge arm switch power amplifier.
Description
Technical Field
The invention relates to a switch power amplifier circuit, in particular to a switch power amplifier circuit which is used for a five-degree-of-freedom magnetic suspension bearing, has a fault-tolerant function and is output by six bridge arms and five phases, and belongs to the field of magnetic bearings.
Background
Magnetic bearings (Magnetic Bearing) are a Bearing device that uses Magnetic forces to suspend a rotor in the air without mechanical contact between the rotor and a stator. Because the rotor does not have mechanical contact and can run to a very high rotating speed, the rotor has the advantages of small mechanical abrasion, low energy consumption, small noise, long service life, no need of lubrication, no oil pollution and the like, and can be applied to dust-free workshops, nuclear power facilities or the aviation field.
Generally, the application environment of the magnetic suspension bearing is special, and if the bearing fails, the consequences are difficult to estimate. The power amplifier of the magnetic suspension bearing is the most critical equipment in the whole closed loop system, and the performance of the power amplifier basically determines the overall use effect of the magnetic suspension bearing. Therefore, the switching power amplifier system of the magnetic suspension bearing must have certain fault tolerance.
For a magnetic suspension bearing switch power amplifier control system with multiple degrees of freedom, each winding in a traditional full-bridge switch power amplifier circuit needs four fully-controlled switch elements. In consideration of reducing cost and simplifying structure, the switch power amplifier circuit with the multi-bridge-arm topological structure is applied to a magnetic suspension bearing control system, and the circuit realizes independent output of each path of current by adding a load bridge arm ground. However, in any power amplifier, the structure thereof cannot realize fault-tolerant control, that is, the control algorithm cannot realize fault tolerance. This is related to the characteristics of the magnetic bearing itself, and the instability of the magnetic bearing in any degree of freedom can cause the instability of the rotor. Due to the multi-bridge arm topological structure, each phase of load current flows through the common bridge arm, so that the fault rate of the common bridge arm is highest, but the condition that the load bridge arm is damaged before the common bridge arm is not eliminated. Therefore, a perfect fault-tolerant design should consider the fault-tolerant control of both the common bridge arm and the load bridge arm.
In summary, how to design a brand-new switch power amplifier circuit with fault-tolerant function based on the current research situation to overcome the shortcomings in the prior art is also a problem of common attention of the technical personnel in the field.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a six-leg five-phase output switch power amplifier circuit with fault-tolerant function for a five-degree-of-freedom magnetic suspension bearing, which is as follows.
The utility model provides a multi-bridge arm switch power amplifier circuit with fault-tolerant function which characterized in that: the device comprises a main circuit structure and a functional module structure, wherein the main circuit structure is electrically connected with the functional module structure; the main circuit structure comprises a common bridge arm, a five-phase load bridge arm, a load bridge arm fault switching circuit, a standby bridge arm and a common bridge arm fault switching circuit which are electrically connected in sequence; the functional module structure comprises a circuit detection module, a reconstruction module and a control signal switching module, wherein a signal input end of the circuit detection module is electrically connected with the public bridge arm, a signal output end of the circuit detection module is electrically connected with signal input ends of the reconstruction module and the control signal switching module respectively, and signal output ends of the reconstruction module and the control signal switching module are electrically connected to the load bridge arm fault switching circuit, the standby bridge arm and the public bridge arm fault switching circuit.
Preferably, the common bridge arm is composed of a first common bridge arm switching tube, a second common bridge arm switching tube, a first common bridge arm diode and a second common bridge arm diode; one end of the first public bridge arm switch tube is electrically connected with a bus voltage source, and the other end of the first public bridge arm switch tube is electrically connected with the second public bridge arm switch tube; the first common bridge arm switching tube is matched with and corresponds to the first common bridge arm diode, and the first common bridge arm switching tube and the first common bridge arm diode are connected in parallel; and the second common bridge arm switching tube is matched and corresponding to the second common bridge arm diode and is connected in parallel with the second common bridge arm diode.
Preferably, two fault detection points for detecting a voltage value of the first common bridge arm switch tube are arranged in the common bridge arm, one of the two fault detection points is arranged between the first common bridge arm switch tube and a bus voltage source, and the other is arranged between the first common bridge arm switch tube and the second common bridge arm switch tube.
Preferably, the five-phase load bridge arms comprise five load bridge arms which are connected in parallel, wherein the five load bridge arms are respectively an A-phase load bridge arm, a B-phase load bridge arm, a C-phase load bridge arm, a D-phase load bridge arm and an E-phase load bridge arm, and the five load bridge arms have the same structure;
the A-phase load bridge arm is composed of a first load bridge arm switch tube, a second load bridge arm switch tube, a first load bridge arm diode and a second load bridge arm diode, the first load bridge arm diode is connected with the first load bridge arm switch tube in parallel, the second load bridge arm diode is connected with the second load bridge arm switch tube in parallel, and a connection node A is arranged between the first load bridge arm switch tube and the second load bridge arm switch tube;
the B-phase load bridge arm is composed of a third load bridge arm switch tube, a fourth load bridge arm switch tube, a third load bridge arm diode and a fourth load bridge arm diode, the third load bridge arm diode is connected with the third load bridge arm switch tube in parallel, the fourth load bridge arm diode is connected with the fourth load bridge arm switch tube in parallel, and a connection node B is arranged between the third load bridge arm switch tube and the fourth load bridge arm switch tube;
the C-phase load bridge arm is composed of a fifth load bridge arm switch tube, a sixth load bridge arm switch tube, a fifth load bridge arm diode and a sixth load bridge arm diode, the fifth load bridge arm diode is connected with the fifth load bridge arm switch tube in parallel, the sixth load bridge arm diode is connected with the sixth load bridge arm switch tube in parallel, and a connection node C is arranged between the fifth load bridge arm switch tube and the sixth load bridge arm switch tube;
the D-phase load bridge arm is composed of a seventh load bridge arm switch tube, an eighth load bridge arm switch tube, a seventh load bridge arm diode and an eighth load bridge arm diode, the seventh load bridge arm diode is connected with the seventh load bridge arm switch tube in parallel, the eighth load bridge arm diode is connected with the eighth load bridge arm switch tube in parallel, and a connection node D is arranged between the seventh load bridge arm switch tube and the eighth load bridge arm switch tube;
the E-phase load bridge arm is composed of a ninth load bridge arm switch tube, a tenth load bridge arm switch tube, a ninth load bridge arm diode and a tenth load bridge arm diode, the ninth load bridge arm diode is connected with the ninth load bridge arm switch tube in parallel, the tenth load bridge arm diode is connected with the tenth load bridge arm switch tube in parallel, and a connection node E is arranged between the ninth load bridge arm switch tube and the tenth load bridge arm switch tube.
Preferably, cathodes of the first load bridge arm diode, the third load bridge arm diode, the fifth load bridge arm diode, the seventh load bridge arm diode and the ninth load bridge arm diode are electrically connected to an anode of a bus voltage source; anodes of the first load bridge arm diode, the third load bridge arm diode, the fifth load bridge arm diode, the seventh load bridge arm diode and the ninth load bridge arm diode are respectively and electrically connected to cathodes of the second load bridge arm diode, the fourth load bridge arm diode, the sixth load bridge arm diode, the eighth load bridge arm diode and the tenth load bridge arm diode in sequence; anodes of the second load bridge arm diode, the fourth load bridge arm diode, the sixth load bridge arm diode, the eighth load bridge arm diode and the tenth load bridge arm diode are electrically connected to a negative electrode of a bus voltage source.
Preferably, the common bridge arm is electrically connected to the five-phase load bridge arm through five resistive loads arranged in parallel, where the five resistive loads are a first resistive load, a second resistive load, a third resistive load, a fourth resistive load, and a fifth resistive load;
the public bridge arm is electrically connected to the connection node A through the first inductance-resistance load, the public bridge arm is electrically connected to the connection node B through the second inductance-resistance load, the public bridge arm is electrically connected to the connection node C through the third inductance-resistance load, the public bridge arm is electrically connected to the connection node D through the fourth inductance-resistance load, and the public bridge arm is electrically connected to the connection node E through the fifth inductance-resistance load.
Preferably, the load bridge arm fault switching circuit comprises five load bridge arm fault switching circuit switching tubes, namely a first load bridge arm fault switching circuit switching tube, a second load bridge arm fault switching circuit switching tube, a third load bridge arm fault switching circuit switching tube, a fourth load bridge arm fault switching circuit switching tube and a fifth load bridge arm fault switching circuit switching tube;
one end of the first load bridge arm fault switching circuit switching tube is electrically connected to the connection node A, the other end of the first load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the second load bridge arm fault switching circuit switching tube is electrically connected to the connection node B, the other end of the second load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the third load bridge arm fault switching circuit switching tube is electrically connected to the connection node C, the other end of the third load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the fourth load bridge arm fault switching circuit switching tube is electrically connected to the connection node D, and the other end of the fourth load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the switch tube of the fifth load bridge arm fault switching circuit is electrically connected to the connection node E, and the other end of the switch tube of the fifth load bridge arm fault switching circuit is electrically connected to the midpoint of the standby bridge arm.
Preferably, the backup bridge arm is composed of a backup bridge arm upper switching tube and a backup bridge arm lower switching tube which are electrically connected with each other, a connection position between the backup bridge arm upper switching tube and the backup bridge arm lower switching tube is a middle point of the backup bridge arm, the backup bridge arm upper switching tube is electrically connected to a positive electrode of the bus voltage source, and the backup bridge arm lower switching tube is electrically connected to a negative electrode of the bus voltage source.
Preferably, the upper switch tube of the spare bridge arm and the lower switch tube of the spare bridge arm cannot be conducted simultaneously in the working states of the upper switch tube of the spare bridge arm and the lower switch tube of the spare bridge arm.
Preferably, the common bridge arm fault switching circuit comprises a common bridge arm fault switching circuit switching tube; one end of the public bridge arm fault switching circuit switching tube is electrically connected to the middle point of the standby bridge arm, and the other end of the public bridge arm fault switching circuit switching tube is electrically connected to a fault detection point in the public bridge arm and between the first public bridge arm switching tube and the second public bridge arm switching tube.
Compared with the prior art, the invention has the advantages that:
the switch power amplifier circuit with the fault-tolerant function is suitable for a five-degree-of-freedom magnetic suspension bearing, the whole circuit adopts six-bridge arm five-phase output, and a spare bridge arm is added on the basis of the existing five-output six-bridge arm switch power amplifier circuit to form a redundant structure. The invention can execute corresponding operation according to the fault detection result, when the public bridge arm/load bridge arm of the switch power amplifier circuit has a fault, the spare bridge arm is started by the public bridge arm fault switching circuit/load bridge arm fault switching circuit to replace the failed bridge arm, thereby realizing reconstruction of the bridge arm structure in the whole circuit under the condition of the fault of the public bridge arm or the load bridge arm and finally realizing fault-tolerant control of the six-bridge arm switch power amplifier.
In addition, the invention also provides a brand new thought for the related research and application of the magnetic bearing switch power amplifier control system, provides reference for other related problems in the same field, can be used for expanding and deeply researching on the basis of the brand new thought, and has wide industrial application prospect.
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The invention discloses a switch power amplifier circuit with fault-tolerant function and six-bridge-arm five-phase output for a five-degree-of-freedom magnetic suspension bearing, which adopts the following specific scheme.
As shown in fig. 1, a multi-bridge arm switch power amplifier circuit with fault-tolerant function is composed of a main circuit structure and a functional module structure, wherein the main circuit structure is electrically connected with the functional module structure.
The main circuit structure comprises a public bridge arm 1, a five-phase load bridge arm 2, a load bridge arm fault switching circuit 3, a standby bridge arm 4 and a public bridge arm fault switching circuit 5 which are electrically connected in sequence.
The functional module structure comprises a circuit detection module, a reconstruction module and a control signal switching module, wherein a signal input end of the circuit detection module is electrically connected with the public bridge arm 1, a signal output end of the circuit detection module is respectively electrically connected with signal input ends of the reconstruction module and the control signal switching module, and signal output ends of the reconstruction module and the control signal switching module are electrically connected with the load bridge arm fault switching circuit 3, the standby bridge arm 4 and the public bridge arm fault switching circuit 5.
Generally, the circuit detection module can detect the state of the main power circuit of the common bridge arm in real time, such as monitoring a fault signal, and transmit information to the reconstruction module and the control signal switching module. The reconstruction module positions a fault power tube through calculation, the control signal switching module transmits a control signal of the fault power tube to the switch power amplifier controller, and the controller switches the switch signal from the fault power tube to the redundant power tube, so that the redundant power tube replaces the fault power tube to work, and the circuit is ensured to meet normal operation.
The common bridge arm 1 is composed of a first common bridge arm switch tube Sn1A second common bridge arm switch tube Sn2A first common bridge arm diode Dn1And a second common leg diode Dn2And (4) forming. The first common bridge arm switch tube Sn1One end of the voltage source is electrically connected with a bus voltage source UdcThe first common bridge arm switch tube Sn1The other end of the first common bridge arm is electrically connected with the second common bridge arm switch tube Sn2. The first common bridge arm switch tube Sn1And the first common bridge arm diode Dn1The matching is corresponding and the two are connected in parallel. The second common bridgeArm switch tube Sn2And the second common bridge arm diode Dn2The matching is corresponding and the two are connected in parallel.
Two public bridge arm switching tubes S for detecting the first public bridge arm are arranged in the public bridge arm 1n1One of the two fault detection points is arranged on the first common bridge arm switch tube Sn1And bus voltage source UdcAnd the other is arranged on the first common bridge arm switch tube Sn1And the second common bridge arm switch tube Sn2In the meantime.
The five-phase load bridge arm 2 comprises five load bridge arms which are connected in parallel, wherein the five load bridge arms are respectively an A-phase load bridge arm, a B-phase load bridge arm, a C-phase load bridge arm, a D-phase load bridge arm and an E-phase load bridge arm, and the five load bridge arms have the same structure.
The A-phase load bridge arm is composed of a first load bridge arm switching tube Sa1A second load bridge arm switch tube Sa2First load bridge arm diode Da1And a second load leg diode Da2The first load bridge arm diode Da1And the first load bridge arm switch tube Sa1In parallel, the second load bridge arm diode Da2And the second load bridge arm switch tube Sa2In parallel, the first load bridge arm switch tube Sa1And the second load bridge arm switch tube Sa2A connecting node a is arranged between them.
The B-phase load bridge arm is composed of a third load bridge arm switching tube Sa3And a fourth load bridge arm switch tube Sa4A third load bridge arm diode Da3And a fourth load leg diode Da4The third load bridge arm diode Da3And the third load bridge arm switch tube Sa3In parallel, the fourth load bridge arm diode Da4And the fourth load bridge arm switching tube Sa4In parallel, the third load bridge arm switch tube Sa3And the fourth load bridge arm switching tube Sa4With a connecting node B in between.
The C-phase load bridge arm is composed of a fifth load bridge arm switching tube Sa5And a sixth load bridge arm switch tube Sa6Fifth load bridge arm diode Da5And a sixth load leg diode Da6The fifth load bridge arm diode Da5And the fifth load bridge arm switching tube Sa5In parallel, the sixth load bridge arm diode Da6And the sixth load bridge arm switch tube Sa6In parallel, the fifth load bridge arm switch tube Sa5And the sixth load bridge arm switch tube Sa6A connecting node C is arranged between the two.
The D-phase load bridge arm is composed of a seventh load bridge arm switching tube Sn7And the eighth load bridge arm switch tube Sn8Seventh load bridge arm diode Da7And an eighth load leg diode Da8The seventh load bridge arm diode Da7And the seventh load bridge arm switching tube Sn7In parallel, the eighth load bridge arm diode Da8And the eighth load bridge arm switch tube Sn8In parallel, the seventh load bridge arm switch tube Sn7And the eighth load bridge arm switch tube Sn8A connecting node D is arranged between the two.
The E-phase load bridge arm is composed of a ninth load bridge arm switching tube Sa9And a tenth load bridge arm switch tube Sa10Ninth load bridge arm diode Da9And a tenth load leg diode Da10The ninth load arm diode Da9And the ninth load bridge arm switching tube Sa9In parallel, the tenth load bridge arm diode Da10And the tenth load bridge arm switching tube Sa10In parallel, the ninth load bridge arm switch tube Sa9And the tenth load bridge arm switching tube Sa10A connecting node E is provided therebetween.
The first load bridge arm diode Da1The third load bridge arm diode Da3The fifth load bridge arm diode Da5The seventh load bridge arm diode Da7And the ninth load leg diode Da9The cathodes of the five are electrically connected to a bus voltage source UdcThe positive electrode of (1). The first loadBridge arm diode Da1The third load bridge arm diode Da3The fifth load bridge arm diode Da5The seventh load bridge arm diode Da7And the ninth load leg diode Da9The anodes of the five are respectively and sequentially electrically connected to the second load bridge arm diode Da2The fourth load bridge arm diode Da4The sixth load bridge arm diode Da6The eighth load bridge arm diode Da8And the tenth load leg diode Da10Five cathodes. The second load bridge arm diode Da2The fourth load bridge arm diode Da4The sixth load bridge arm diode Da6The eighth load bridge arm diode Da8And the tenth load leg diode Da10The anodes of the five are electrically connected to the negative pole of the bus voltage source Udc.
The common bridge arm 1 is electrically connected with the five-phase load bridge arm 2 through five inductive loads which are arranged in parallel, and the five inductive loads are respectively first inductive loads LaA second resistance-inductance load LbA third resistive load LcA fourth resistive load LdAnd a fifth resistive load Le。
The common bridge arm 1 passes through the first inductance resistance load LaElectrically connected to the connection node A, the common bridge arm 1 passes through the second inductance-resistance load LbElectrically connected to the connection node B, the common bridge arm 1 passes through the third resistive load LcElectrically connected to the connection node C, the common bridge arm 1 passes through the fourth resistive load LdElectrically connected to the connection node D, the common bridge arm 1 passes through the fifth resistive load LeIs electrically connected to the connection node E.
The load bridge arm fault switching circuit 3 comprises five load bridge arm fault switching circuit switching tubes, namely a first load bridge arm fault switching circuit switching tube SaSecond load bridge arm fault switching circuit switch tube SbA third loadSwitching tube S of bridge arm fault switching circuitcAnd a fourth load bridge arm fault switching circuit switch tube SdAnd a fifth load bridge arm fault switching circuit switching tube Se。
The first load bridge arm fault switching circuit switch tube SaOne end of the first load bridge arm is electrically connected to the connection node A and the first load bridge arm fault switching circuit switch tube SaThe other end of the second load bridge arm is electrically connected to the middle point of the spare bridge arm 4, and the second load bridge arm fault switching circuit is provided with a switching tube SbOne end of the first load bridge arm is electrically connected to the connection node B and the second load bridge arm fault switching circuit switch tube SbThe other end of the third load bridge arm is electrically connected to the middle point of the spare bridge arm 4, and the third load bridge arm fault switching circuit is provided with a switching tube ScOne end of the third load bridge arm is electrically connected to the connection node C and the third load bridge arm fault switching circuit switch tube ScThe other end of the second load bridge arm is electrically connected to the middle point of the spare bridge arm 4, and the fourth load bridge arm fault switching circuit switching tube SdOne end of the fourth load bridge arm is electrically connected to the connection node D and the fourth load bridge arm fault switching circuit switch tube SdThe other end of the first load bridge arm is electrically connected to the middle point of the spare bridge arm 4, and the fifth load bridge arm fault switching circuit switching tube SeOne end of the first load bridge arm is electrically connected to the connection node E and the fifth load bridge arm fault switching circuit switching tube SeAnd the other end of the bridge arm is electrically connected to the midpoint of the spare bridge arm 4.
The spare bridge arm 4 is composed of a spare bridge arm upper switch tube S which are electrically connected with each otherupAnd a spare underarm switch tube SdnThe spare bridge arm is provided with a switch tube SupAnd a spare under-arm switching tube SdnThe connection position between the two is the middle point of the spare bridge arm 4, and a switch tube S on the spare bridge armupIs electrically connected to the bus voltage source UdcThe spare bridge arm lower switch tube SdnIs electrically connected to the bus voltage source UdcThe negative electrode of (1).
A switch tube S on the spare bridge armupAnd a spare under-arm switching tube SdnUnder the working condition of the two, IIThey cannot be turned on simultaneously.
The common bridge arm fault switching circuit 5 comprises a common bridge arm fault switching circuit switching tube Sn. Switch tube S of fault switching circuit of common bridge armnOne end of the first switching tube is electrically connected to the middle point of the standby bridge arm 4, and the common bridge arm fault switching circuit is provided with a switching tube SnIs electrically connected to the first common bridge arm switch tube S in the common bridge arm 1n1And the second common bridge arm switch tube Sn2Fault detection point in between.
Taking the common bridge arm 1 and the a-phase load bridge arm as an example, four working states after the open circuit fault of the common bridge arm 1 are as follows:
a. and the tube on the common bridge arm is disconnected. The circuit detection module converts the voltage value UNODE1-NODE2And transmitting the conduction signal to the reconstruction module through the upper tube of the common bridge arm. If the controller applies a conducting signal to the upper tube of the common bridge arm and U is appliedNODE1-NODE2And if not equal to 0, the reconstruction module judges that the switching tube has a fault. At the moment, the control signal switching module outputs a driving signal to enable the switching tube S on the standby bridge arm to be switched on and offupPublic bridge arm fault switching circuit switch tube SnAnd conducting. Bridge arm upper switch tube S for current self-supplyupSwitching tube S of fault switching circuit flowing through common bridge armnThus, an equivalent substitution thereof is accomplished in the event of a pipe break on the common leg.
b. The lower tube of the common bridge arm is broken. The circuit detection module converts the voltage value UNODE1-NODE2And transmitting the signal communicated with the lower tube of the common bridge arm to the reconstruction module. If the controller applies a conducting signal to the lower tube of the common bridge arm and U is equal to the conducting signalNODE1-NODE2≠UdAnd the reconstruction module judges the fault of the switching tube. At the moment, the control signal switching module outputs a driving signal to enable the standby bridge arm lower switch tube SdnPublic bridge arm fault switching circuit switch tube SnAnd conducting. Bridge lower switch tube S for current self-supplydnSwitching tube S of fault switching circuit flowing through common bridge armnThus, equivalent substitution is completed under the condition that the lower tube of the common bridge arm is broken.
c. And the upper tube of the A-phase load bridge arm is disconnected. Circuit detection moduleAnd transmitting the A-phase load current value and the conduction signal on the A-phase load bridge arm to the reconstruction module. It should be noted here that the current sensor for detecting the a-phase load current value is self-contained in the magnetic bearing device, and is not shown in the drawings because no additional sensor is added to the present circuit. Meanwhile, the current is specified to be the positive direction from left to right, and the same is applied below. And if the controller applies a conducting signal to the lower tube of the common bridge arm and the upper tube of the A-phase load bridge arm and the change rate of the A-phase current is not a negative number, the reconstruction module judges that the switching tube has a fault. At the moment, the control signal switching module outputs a driving signal to enable the switching tube S on the standby bridge arm to be switched on and offupFirst load bridge arm fault switching circuit switch tube SaAnd conducting. Bridge arm upper switch tube S for current self-supplyupSwitching tube S flowing through first load bridge arm fault switching circuitaThus, the equivalent replacement of the A-phase load bridge arm is completed under the condition of the open circuit of the A-phase load bridge arm.
d. And the lower tube of the A-phase load bridge arm is broken. The circuit detection module transmits the A-phase load current value and the A-phase load bridge arm lower tube conduction signal to the reconstruction module. And if the controller applies a conducting signal to the upper tube of the common bridge arm and the lower tube of the A-phase load bridge arm and the change rate of the A-phase current is not a positive number, the reconstruction module judges that the switching tube has a fault. At the moment, the control signal switching module outputs a driving signal to enable the standby bridge arm lower switch tube SdnFirst load bridge arm fault switching circuit switch tube SaAnd conducting. Switching tube S for current switching circuit from first load bridge arm faultaFlow through standby bridge arm lower switch tube SdnTherefore, equivalent substitution is completed under the condition that the lower tube of the A-phase load bridge arm is broken.
The invention can realize fault-tolerant control under the condition of single switching tube fault, and the fault-tolerant circuits of the upper bridge arms of a plurality of load bridge arms or the fault-tolerant currents of the lower bridge arms of a plurality of load bridge arms can be obtained by analogy in turn. Taking the situation that A, B-phase load bridge arm lower tubes simultaneously have an open-circuit fault as an example:
e. the lower tubes of the A, B phase load bridge arms are simultaneously disconnected. The circuit detection module transmits the A-phase load current value, the B-phase load current value, the A-phase load bridge arm lower tube conduction signal and the B-phase load bridge arm lower tube conduction signal to the reconstruction module. If the controllerAnd applying conduction signals to the upper common bridge arm tube, the lower A-phase load bridge arm tube and the lower B-phase load bridge arm tube, wherein the change rate of the A-phase current and the change rate of the B-phase current are not positive numbers, and judging the A, B-phase load bridge arm tube fault by the reconstruction module. At the moment, the control signal switching module outputs a driving signal to enable the standby bridge arm lower switch tube SdnFirst load bridge arm fault switching circuit switch tube SaAnd a second load bridge arm fault switching circuit switching tube SbAnd conducting. Switching tube S for current switching circuit from first load bridge arm faultaAnd a second load bridge arm fault switching circuit switching tube SbFlow through standby bridge arm lower switch tube SdnThus, equivalent substitution is completed in the case of the lower tube of the A, B-phase load bridge arm being disconnected.
In summary, the switch power amplifier circuit with the fault-tolerant function provided by the invention is suitable for a five-degree-of-freedom magnetic suspension bearing, the whole circuit adopts six-bridge arm five-phase output, and a spare bridge arm is added on the basis of the existing five-output six-bridge arm switch power amplifier circuit to form a redundant structure. The invention can execute corresponding operation according to the fault detection result, when the public bridge arm/load bridge arm of the switch power amplifier circuit has a fault, the spare bridge arm is started by the public bridge arm fault switching circuit/load bridge arm fault switching circuit to replace the failed bridge arm, thereby realizing reconstruction of the bridge arm structure in the whole circuit under the condition of the fault of the public bridge arm or the load bridge arm and finally realizing fault-tolerant control of the six-bridge arm switch power amplifier.
In addition, the invention also provides a brand new thought for the related research and application of the magnetic bearing switch power amplifier control system, provides reference for other related problems in the same field, can be used for expanding and deeply researching on the basis of the brand new thought, and has wide industrial application prospect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Finally, it should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments can be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a multi-bridge arm switch power amplifier circuit with fault-tolerant function which characterized in that: the device comprises a main circuit structure and a functional module structure, wherein the main circuit structure is electrically connected with the functional module structure; the main circuit structure comprises a common bridge arm, a five-phase load bridge arm, a load bridge arm fault switching circuit, a standby bridge arm and a common bridge arm fault switching circuit which are electrically connected in sequence; the functional module structure comprises a circuit detection module, a reconstruction module and a control signal switching module, wherein a signal input end of the circuit detection module is electrically connected with the public bridge arm, a signal output end of the circuit detection module is electrically connected with signal input ends of the reconstruction module and the control signal switching module respectively, and signal output ends of the reconstruction module and the control signal switching module are electrically connected to the load bridge arm fault switching circuit, the standby bridge arm and the public bridge arm fault switching circuit.
2. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 1, wherein: the common bridge arm is composed of a first common bridge arm switching tube, a second common bridge arm switching tube, a first common bridge arm diode and a second common bridge arm diode; one end of the first public bridge arm switch tube is electrically connected with a bus voltage source, and the other end of the first public bridge arm switch tube is electrically connected with the second public bridge arm switch tube; the first common bridge arm switching tube is matched with and corresponds to the first common bridge arm diode, and the first common bridge arm switching tube and the first common bridge arm diode are connected in parallel; and the second common bridge arm switching tube is matched and corresponding to the second common bridge arm diode and is connected in parallel with the second common bridge arm diode.
3. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 2, characterized in that: two fault detection points for detecting the voltage value of the first common bridge arm switch tube are arranged in the common bridge arm, one of the two fault detection points is arranged between the first common bridge arm switch tube and a bus voltage source, and the other fault detection point is arranged between the first common bridge arm switch tube and the second common bridge arm switch tube.
4. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 3, wherein: the five-phase load bridge arms comprise five load bridge arms which are arranged in parallel, namely an A-phase load bridge arm, a B-phase load bridge arm, a C-phase load bridge arm, a D-phase load bridge arm and an E-phase load bridge arm, and the five load bridge arms have the same structure;
the A-phase load bridge arm is composed of a first load bridge arm switch tube, a second load bridge arm switch tube, a first load bridge arm diode and a second load bridge arm diode, the first load bridge arm diode is connected with the first load bridge arm switch tube in parallel, the second load bridge arm diode is connected with the second load bridge arm switch tube in parallel, and a connection node A is arranged between the first load bridge arm switch tube and the second load bridge arm switch tube;
the B-phase load bridge arm is composed of a third load bridge arm switch tube, a fourth load bridge arm switch tube, a third load bridge arm diode and a fourth load bridge arm diode, the third load bridge arm diode is connected with the third load bridge arm switch tube in parallel, the fourth load bridge arm diode is connected with the fourth load bridge arm switch tube in parallel, and a connection node B is arranged between the third load bridge arm switch tube and the fourth load bridge arm switch tube;
the C-phase load bridge arm is composed of a fifth load bridge arm switch tube, a sixth load bridge arm switch tube, a fifth load bridge arm diode and a sixth load bridge arm diode, the fifth load bridge arm diode is connected with the fifth load bridge arm switch tube in parallel, the sixth load bridge arm diode is connected with the sixth load bridge arm switch tube in parallel, and a connection node C is arranged between the fifth load bridge arm switch tube and the sixth load bridge arm switch tube;
the D-phase load bridge arm is composed of a seventh load bridge arm switch tube, an eighth load bridge arm switch tube, a seventh load bridge arm diode and an eighth load bridge arm diode, the seventh load bridge arm diode is connected with the seventh load bridge arm switch tube in parallel, the eighth load bridge arm diode is connected with the eighth load bridge arm switch tube in parallel, and a connection node D is arranged between the seventh load bridge arm switch tube and the eighth load bridge arm switch tube;
the E-phase load bridge arm is composed of a ninth load bridge arm switch tube, a tenth load bridge arm switch tube, a ninth load bridge arm diode and a tenth load bridge arm diode, the ninth load bridge arm diode is connected with the ninth load bridge arm switch tube in parallel, the tenth load bridge arm diode is connected with the tenth load bridge arm switch tube in parallel, and a connection node E is arranged between the ninth load bridge arm switch tube and the tenth load bridge arm switch tube.
5. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 3, wherein: cathodes of the first load bridge arm diode, the third load bridge arm diode, the fifth load bridge arm diode, the seventh load bridge arm diode and the ninth load bridge arm diode are electrically connected to an anode of a bus voltage source; anodes of the first load bridge arm diode, the third load bridge arm diode, the fifth load bridge arm diode, the seventh load bridge arm diode and the ninth load bridge arm diode are respectively and electrically connected to cathodes of the second load bridge arm diode, the fourth load bridge arm diode, the sixth load bridge arm diode, the eighth load bridge arm diode and the tenth load bridge arm diode in sequence; anodes of the second load bridge arm diode, the fourth load bridge arm diode, the sixth load bridge arm diode, the eighth load bridge arm diode and the tenth load bridge arm diode are electrically connected to a negative electrode of a bus voltage source.
6. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 3, wherein: the common bridge arm is electrically connected with the five-phase load bridge arm through five inductive loads which are arranged in parallel, wherein the five inductive loads are a first inductive load, a second inductive load, a third inductive load, a fourth inductive load and a fifth inductive load respectively;
the public bridge arm is electrically connected to the connection node A through the first inductance-resistance load, the public bridge arm is electrically connected to the connection node B through the second inductance-resistance load, the public bridge arm is electrically connected to the connection node C through the third inductance-resistance load, the public bridge arm is electrically connected to the connection node D through the fourth inductance-resistance load, and the public bridge arm is electrically connected to the connection node E through the fifth inductance-resistance load.
7. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 3, wherein: the load bridge arm fault switching circuit comprises five load bridge arm fault switching circuit switching tubes, namely a first load bridge arm fault switching circuit switching tube, a second load bridge arm fault switching circuit switching tube, a third load bridge arm fault switching circuit switching tube, a fourth load bridge arm fault switching circuit switching tube and a fifth load bridge arm fault switching circuit switching tube;
one end of the first load bridge arm fault switching circuit switching tube is electrically connected to the connection node A, the other end of the first load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the second load bridge arm fault switching circuit switching tube is electrically connected to the connection node B, the other end of the second load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the third load bridge arm fault switching circuit switching tube is electrically connected to the connection node C, the other end of the third load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the fourth load bridge arm fault switching circuit switching tube is electrically connected to the connection node D, and the other end of the fourth load bridge arm fault switching circuit switching tube is electrically connected to the midpoint of the spare bridge arm, one end of the switch tube of the fifth load bridge arm fault switching circuit is electrically connected to the connection node E, and the other end of the switch tube of the fifth load bridge arm fault switching circuit is electrically connected to the midpoint of the standby bridge arm.
8. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 7, wherein: the standby bridge arm is composed of a standby bridge arm upper switching tube and a standby bridge arm lower switching tube which are electrically connected with each other, the connection position between the standby bridge arm upper switching tube and the standby bridge arm lower switching tube is the middle point of the standby bridge arm, the standby bridge arm upper switching tube is electrically connected to the positive pole of a bus voltage source, and the standby bridge arm lower switching tube is electrically connected to the negative pole of the bus voltage source.
9. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 8, wherein: and under the working states of the spare bridge arm upper switching tube and the spare bridge arm lower switching tube, the spare bridge arm upper switching tube and the spare bridge arm lower switching tube cannot be conducted at the same time.
10. The multi-bridge arm switch power amplifier circuit with fault-tolerant function of claim 7, wherein: the public bridge arm fault switching circuit comprises a public bridge arm fault switching circuit switching tube; one end of the public bridge arm fault switching circuit switching tube is electrically connected to the middle point of the standby bridge arm, and the other end of the public bridge arm fault switching circuit switching tube is electrically connected to a fault detection point in the public bridge arm and between the first public bridge arm switching tube and the second public bridge arm switching tube.
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| CN112727923A (en) * | 2020-12-30 | 2021-04-30 | 华中科技大学 | Switch open circuit fault tolerance system and method for magnetic bearing series winding controller |
| CN114263677A (en) * | 2021-12-27 | 2022-04-01 | 华中科技大学 | Five-bridge-arm fault-tolerant control method and system applied to magnetic suspension bearing |
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| CN111894979B (en) | 2022-07-26 |
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