A multi-bridge-arm switching power amplifier circuit with short-circuit fault tolerance function

Abstract

A kind of multi-bridge arm switching power amplifier circuit with short-circuit fault tolerance function, including common bridge arm 1, load bridge arm fault switching circuit 2, common bridge arm fault switching circuit 3, load bridge arm 4 and spare bridge arm 5, common bridge arm 1 is connected with each phase load through fuse, each phase load is connected with each phase load bridge arm 4 through fuse, common bridge arm 1 is connected with spare bridge arm 5 through common bridge arm fault switching circuit 3, load is connected with spare bridge arm 5 through load bridge arm fault switching circuit 2.The circuit is suitable for five degrees of freedom magnetic suspension bearing, the whole circuit adopts six bridge arms five-phase output, on the basis of existing six bridge arms five-phase output switching power amplifier circuit, a spare bridge arm is added, and a redundant structure is formed, so that the magnetic suspension bearing system has the ability of fault tolerance operation under short-circuit fault.

Description

Technical Field

[0001] This invention belongs to the field of magnetic bearing circuit technology, specifically relating to a multi-bridge arm switching power amplifier circuit with short-circuit fault tolerance function. Background Technology

[0002] Compared to traditional mechanical bearings, magnetic levitation bearings offer significant advantages such as contactless operation, wear-free operation, no lubrication required, high precision, low power consumption, adjustable and controllable damping and stiffness, and intelligent control. They are widely used in turbine machinery, flywheel energy storage, aerospace, medical, and nuclear energy fields. In these fields, safety and reliability are paramount. As a typical mechatronics control system, the magnetic levitation bearing system is structurally complex, and a failure can easily lead to safety accidents. Therefore, further improving operational safety and reliability is crucial for magnetic levitation bearing technology research. Typically, the application environment of magnetic levitation bearings is quite unique, and the consequences of bearing failure are often unpredictable. The power amplifier in a magnetic levitation bearing is the most critical component in the entire closed-loop system, and its performance largely determines the overall effectiveness of the bearing. Therefore, the switching power amplifier system for magnetic levitation bearings must possess a certain degree of fault tolerance.

[0003] In the operation of a magnetic levitation bearing system, in order to improve the dynamic response of the system, reduce current ripple, and obtain better control effect, the switching power amplifier topology requires the switching elements to operate at a frequency of 10 to 100 kHz for a long time, constantly switching between different operating modes. This makes it very easy for open circuit or short circuit faults to occur due to overheating, overvoltage, overcurrent, etc. Moreover, its own structure cannot achieve fault-tolerant control, that is, the control algorithm cannot achieve fault tolerance.

[0004] Almost all the information found so far has not attempted fault-tolerant operation under short-circuit faults. However, the failure scenarios of switching transistors are almost all short-circuit failures, and open-circuit failures are almost always caused by the loss of trigger signals, not by the failure of the device itself. Therefore, strictly speaking, current open-circuit fault tolerance has little practical significance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a multi-bridge arm switching power amplifier circuit with short-circuit fault tolerance. Based on the topology of a five-phase six-bridge arm switching power amplifier, a spare bridge arm, a load bridge arm fault switching circuit and a common bridge arm fault switching circuit are added to form a redundant structure. The common bridge arm and the load, as well as each phase load bridge arm and the corresponding load, are connected by fuses.

[0006] The present invention provides a multi-arm switching power amplifier circuit with short-circuit fault tolerance function, including a common arm (1), a load arm fault switching circuit (2), a common arm fault switching circuit (3), a load arm (4), and a spare arm (5). The common arm (1) is connected to each phase load through a fuse, and each phase load is connected to each phase load arm (4) through a fuse. The common arm (1) is connected to the spare arm (5) through the common arm fault switching circuit (3), and the load is connected to the spare arm (5) through the load arm fault switching circuit (2).

[0007] As a further technical solution of the present invention, the common arm fault switching circuit (3) consists of a bidirectional switch S n Composition, switching transistor S n One end is connected to the upper tube S of the common bridge arm (1) via a fuse. n1 With lower tube S n2 Between them, its other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn between.

[0008] Furthermore, the spare bridge arm (5) is an upper pipe S connected in series. np With lower tube S dn The common bridge arm (1) includes the upper pipe S connected in series. n1 With lower tube S n2 The upper tube S connected in series n1 With lower tube S n2 The upper tube S is connected in series. np With lower tube S dn Connected in parallel to power supply U dc The two ends.

[0009] Furthermore, the load arm fault switching circuit (2) consists of a bidirectional switch S a Two-way switch S b Two-way switch S c Two-way switch S d and bidirectional switch S e constitute,

[0010] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the A-phase load, the circuit splits into two paths, one of which connects to a bidirectional switch S. a One end, a two-way switch S a The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. a1 and lower tube S a2 between;

[0011] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through the fuse and the B-phase load, the circuit splits into two paths, one of which is connected to the bidirectional switch S. b One end, a two-way switch S b The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. b1 and lower tube S b2 between;

[0012] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the C-phase load, the circuit splits into two paths, one of which is connected to a bidirectional switch S. c One end, a two-way switch S c The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. c1 and lower tube S c2 between;

[0013] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the D-phase load, the circuit splits into two paths, one of which connects to a bidirectional switch S. d One end, a two-way switch S d The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. d1 and lower tube S d2 between;

[0014] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through the fuse and the E-phase load, the circuit splits into two paths, one of which is connected to the bidirectional switch S. e One end, a two-way switch S e The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. e1 and lower tube S e2 between.

[0015] Furthermore, the load arm (4) includes an upper tube S connected in series. a1 and lower tube S a2 The upper tube S in series b1and lower tube S b2 The upper tube S in series c1 and lower tube S c2 The upper tube S in series d1 and lower tube S d2 and the upper tube S in series e1 and lower tube S e2 ; Series-connected upper tube S a1 and lower tube S a2 The upper tube S in series b1 and lower tube S b2 The upper tube S in series c1 and lower tube S c2 The upper tube S in series d1 and lower tube S d2 and the upper tube S in series e1 and lower tube S e2 With power supply U dc The two ends are connected in parallel.

[0016] The advantages of this invention are that it is applicable to five-degree-of-freedom magnetic levitation bearings. The circuit adopts a six-bridge arm five-phase output, which adds a spare bridge arm to the existing five-output six-bridge arm switching power amplifier circuit, forming a redundant structure. This enables the magnetic levitation bearing system to operate in a fault-tolerant manner under short-circuit faults. In addition, this invention provides a brand-new idea for the research and application of magnetic levitation bearing switching power amplifier control system, and has broad application prospects in the industry. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the present invention;

[0018] Figure 2 This is a topology diagram of a five-phase, six-bridge-arm system.

[0019] Figure 3 This is a schematic diagram of the operation of the short-circuit fault fuse circuit on the upper tube of the common bridge arm according to the present invention;

[0020] Figure 4 This is a schematic diagram of the operation of the short-circuit fault circuit on the upper pipe of the common bridge arm of the present invention.

[0021] Figure 5 This is a schematic diagram of the operation of the common bridge arm lower tube short-circuit fault fuse circuit of the present invention;

[0022] Figure 6 This is a schematic diagram of the operation of the common bridge arm lower tube short-circuit fault circuit of the present invention.

[0023] Figure 7 This is a schematic diagram of the operation of the short-circuit fault fuse circuit of the upper tube of the A-phase load bridge arm of the present invention;

[0024] Figure 8This is a schematic diagram of the operation of the short-circuit fault circuit on the upper tube of the A-phase load bridge arm of the present invention.

[0025] Figure 9 This is a schematic diagram of the operation of the fuse circuit for short circuit fault in the lower tube of the A-phase load bridge arm according to the present invention;

[0026] Figure 10 This is a schematic diagram of the operation of the A-phase load bridge arm lower tube short-circuit fault circuit of the present invention. Detailed Implementation

[0027] Please see Figure 1 This embodiment provides a multi-arm switching power amplifier circuit with short-circuit fault tolerance function according to the present invention, including a common arm (1), a load arm fault switching circuit (2), a common arm fault switching circuit (3), a load arm (4), and a spare arm (5). The common arm (1) is connected to each phase load through a fuse, and each phase load is connected to each phase load arm (4) through a fuse. The common arm (1) is connected to the spare arm (5) through the common arm fault switching circuit (3), and the load is connected to the spare arm (5) through the load arm fault switching circuit (2).

[0028] The common arm fault switching circuit (3) consists of a bidirectional switch S n Composition, switching transistor S n One end is connected to the upper tube S of the common bridge arm (1) via a fuse. n1 With lower tube S n2 Between them, its other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn between.

[0029] The spare bridge arm (5) is an upper tube S connected in series. np With lower tube S dn The common bridge arm (1) includes the upper pipe S connected in series. n1 With lower tube S n2 The upper tube S connected in series n1 With lower tube S n2 The upper tube S is connected in series. np With lower tube S dn Connected in parallel to power supply U dc The two ends.

[0030] The load arm fault switching circuit (2) consists of a bidirectional switch S a Two-way switch S b Two-way switch S c Two-way switch S d and bidirectional switch S e constitute,

[0031] The upper pipe S of the common bridge arm (1) n1 With lower tube Sn2 After passing through a fuse and the A-phase load, the circuit splits into two paths, one of which connects to a bidirectional switch S. a One end, a two-way switch S a The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. a1 and lower tube S a2 between;

[0032] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through the fuse and the B-phase load, the circuit splits into two paths, one of which is connected to the bidirectional switch S. b One end, a two-way switch S b The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. b1 and lower tube S b2 between;

[0033] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the C-phase load, the circuit splits into two paths, one of which is connected to a bidirectional switch S. c One end, a two-way switch S c The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. c1 and lower tube S c2 between;

[0034] The upper pipe S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the D-phase load, the circuit splits into two paths, one of which connects to a bidirectional switch S. d One end, a two-way switch S d The other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. d1 and lower tube S d2 between;

[0035] upper pipe S of public bridge arm 1 n1 With lower tube S n2 After passing through the fuse and the E-phase load, the circuit splits into two paths, one of which is connected to the bidirectional switch S. e One end, a two-way switch S eThe other end is connected to the upper pipe S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. e1 and lower tube S e2 between.

[0036] Load arm 4 includes an upper tube S connected in series. a1 and lower tube S a2 The upper tube S in series b1 and lower tube S b2 The upper tube S in series c1 and lower tube S c2 The upper tube S in series d1 and lower tube S d2 and the upper tube S in series e1 and lower tube S e2 ; Series-connected upper tube S a1 and lower tube S a2 The upper tube S in series b1 and lower tube S b2 The upper tube S in series c1 and lower tube S c2 The upper tube S in series d1 and lower tube S d2 and the upper tube S in series e1 and lower tube S e2 With power supply U dc The two ends are connected in parallel.

[0037] The short-circuit fault-tolerant working principle of this circuit is as follows.

[0038] When the upper switch S of the common bridge arm (1) n1 In the event of a short circuit fault, the switch S under the common bridge arm is turned off. n2 Turn on the switching circuit switch S n Ensure the backup bridge arm lower switch tube S dn The circuit remains open, forming a loop, which blows the common arm fuse. Figure 3 As shown.

[0039] After the fuse blows, ensure that the changeover switch S n The circuit remains open, allowing the spare bridge arm to replace the common bridge arm, such as... Figure 4 As shown.

[0040] When the switch S under the common bridge arm n2 In the event of a short circuit fault, the switch S on the common bridge arm is turned off. n1 Turn on the switching circuit switch S n Ensure that the switching transistor S on the redundant bridge arm up The circuit remains open, forming a loop, which blows the fuse in the common arm (1), such as... Figure 5 As shown.

[0041] After the fuse blows, ensure that the changeover switch S n The circuit remains open, allowing the spare bridge arm to replace the common bridge arm, such as... Figure 6 As shown.

[0042] When the switching transistor S on phase A load arm a1 In the event of a short circuit fault, the switch S at the lower arm of the A-phase load bridge is turned off. a2 Turn on the switch S a Ensure that the switching transistor S under the redundant bridge arm dn The circuit remains open, forming a loop, which blows the A-phase load arm fuse. Figure 7 As shown.

[0043] After the fuse blows, ensure that the changeover switch S a The circuit remains open, allowing the spare bridge arm to replace the load bridge arm of phase A, as shown below. Figure 8 As shown.

[0044] When phase A load bridge arm lower pipe S a2 In the event of a short circuit fault, the switch S on the load arm of phase A is turned off. a1 Turn on the switch S a Ensure that the switching transistor S under the redundant bridge arm up The circuit remains open, forming a loop, which blows the A-phase load arm fuse. Figure 9 As shown.

[0045] After the fuse blows, ensure that the changeover switch S a The circuit remains open, allowing the spare bridge arm to replace the load bridge arm of phase A, as shown below. Figure 10 As shown.

[0046] The short-circuit fault tolerance principle of the other four load arms B, C, D, and E is the same as that of the load arm A.

[0047] In actual operation, when the magnetic levitation system is working normally, the switching transistor S of the fault switching circuit of the multi-bridge arm switching power amplifier topology... n S a S b S c S d and S e With all sections turned off, the topology can be viewed as a five-phase, six-bridge-arm topology acting as a magnetic levitation bearing switching amplifier, such as... Figure 2 As shown. At this time, five currents can be output independently, thereby generating five levitation forces to control the levitation of the magnetic levitation bearing in five degrees of freedom.

[0048] Because short-circuit faults generate large currents, MOSFETs with high on-state current are required when selecting spare bridge arms. Research shows that there are still a considerable number of MOSFETs with a withstand voltage of 100V and an on-state current exceeding 200A available, and their unit price is below 20 yuan. This provides both the hardware foundation and economic viability for practical implementation.

[0049] This structure enables rapid fuse blowing in the event of a short circuit. After blowing, the winding will connect to the spare bridge arm and completely disconnect from the faulty bridge arm, thus achieving short circuit removal and fault-tolerant operation.

[0050] In summary, this circuit is suitable for five-degree-of-freedom magnetic levitation bearings. The circuit adopts a six-bridge arm five-phase output. Based on the existing five-output six-bridge arm switching power amplifier circuit, an additional spare bridge arm is added to form a redundant structure, enabling the magnetic levitation bearing system to operate fault-tolerantly under short-circuit faults.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the specific embodiments described above. The specific embodiments and descriptions in the specification are merely for further illustrating the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-bridge-arm switching power amplifier circuit with short-circuit fault tolerance, characterized in that, It includes a common bridge arm (1), a load bridge arm fault switching circuit (2), a common bridge arm fault switching circuit (3), a load bridge arm (4), and a spare bridge arm (5). The common bridge arm (1) is connected to each phase load through a fuse, and each phase load is connected to each phase load bridge arm (4) through a fuse. The common bridge arm (1) is connected to the spare bridge arm (5) through the common bridge arm fault switching circuit (3), and the load is connected to the spare bridge arm (5) through the load bridge arm fault switching circuit (2). The common arm fault switching circuit (3) consists of a bidirectional switch S n The bidirectional switch S is configured as follows: n One end is connected to the upper tube S of the common bridge arm (1) via a fuse. n1 With lower tube S n2 Between them, its other end is connected to the upper tube S of the spare bridge arm (5). np With lower tube S dn between; The load arm fault switching circuit (2) consists of a bidirectional switch S a Two-way switch S b Two-way switch S c Two-way switch S d and bidirectional switch S e constitute, The upper tube S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the A-phase load, the circuit splits into two paths, one of which connects to the bidirectional switch S. a One end of the bidirectional switch S a The other end is connected to the upper tube S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. a1 and lower tube S a2 between; The upper tube S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the B-phase load, the circuit splits into two paths, one of which connects to the bidirectional switch S. b One end of the bidirectional switch S b The other end is connected to the upper tube S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. b1 and lower tube S b2 between; The upper tube S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the C-phase load, the circuit splits into two paths, one of which connects to the bidirectional switch S. c One end of the bidirectional switch S c The other end is connected to the upper tube S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. c1 and lower tube S c2 between; The upper tube S of the common bridge arm (1) n1 With lower tube S n2 After passing through a fuse and the D-phase load, the circuit splits into two paths, one of which connects to the bidirectional switch S. d One end of the bidirectional switch S d The other end is connected to the upper tube S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. d1 and lower tube S d2 between; The upper tube S of the common bridge arm (1) n1 With lower tube S n2 After passing through the fuse and the E-phase load, the circuit splits into two paths, one of which connects to the bidirectional switch S. e One end of the bidirectional switch S e The other end is connected to the upper tube S of the spare bridge arm (5). np With lower tube S dn Between them, another path is connected to the upper tube S of the load arm (4) via a fuse. e1 and lower tube S e2 between.

2. The multi-bridge-arm switching power amplifier circuit with short-circuit fault tolerance function according to claim 1, characterized in that, The spare bridge arm (5) is an upper tube S connected in series. np With lower tube S dn The common bridge arm (1) includes upper pipes S connected in series. n1 With lower tube S n2 The upper tube S connected in series n1 With lower tube S n2 The upper tube S is connected in series. np With lower tube S dn Connected in parallel to power supply U dc The two ends.

3. The multi-bridge-arm switching power amplifier circuit with short-circuit fault tolerance function according to claim 1, characterized in that, The load arm (4) includes an upper tube S connected in series. a1 and lower tube S a2 The upper tube S in series b1 and lower tube S b2 The upper tube S in series c1 and lower tube S c2 The upper tube S in series d1 and lower tube S d2 and the upper tube S in series e1 and lower tube S e2 ; Series-connected upper tube S a1 and lower tube S a2 The upper tube S in series b1 and lower tube S b2 The upper tube S in series c1 and lower tube S c2 The upper tube S in series d1 and lower tube S d2 and the upper tube S in series e1 and lower tube S e2 With power supply U dc The two ends are connected in parallel.

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