CN-115085523-B - Multi-bridge arm switching power amplifier circuit with short circuit fault tolerance function

CN115085523BCN 115085523 BCN115085523 BCN 115085523BCN-115085523-B

Abstract

A multi-bridge arm switch power amplifier circuit with a short circuit fault tolerance function comprises a public bridge arm 1, a load bridge arm fault switching circuit 2, a public bridge arm fault switching circuit 3, a load bridge arm 4 and a standby bridge arm 5, wherein the public bridge arm 1 is connected with loads of all phases through fuses, the loads of all phases are connected with the load bridge arms 4 of all phases through fuses, the public bridge arm 1 is connected with the standby bridge arm 5 through the public bridge arm fault switching circuit 3, and the loads are connected with the standby bridge arm 5 through the load bridge arm fault switching circuit 2. The circuit is suitable for a five-degree-of-freedom magnetic suspension bearing, the whole circuit adopts six-bridge arm five-phase output, a standby bridge arm is added on the basis of the existing six-bridge arm switch power amplifier circuit with five-path output, a redundant structure is formed, and the magnetic suspension bearing system has fault-tolerant operation capability under short circuit fault.

Inventors

LIU CHENGZI
Xi Zhisheng
YANG YAN
LIU ZEYUAN

Assignees

南京邮电大学

Dates

Publication Date: 20260512
Application Date: 20220622

Claims (3)

1. The multi-bridge arm switch power amplifier circuit with the short circuit fault tolerance function is characterized by comprising a public bridge arm (1), a load bridge arm fault switching circuit (2), a public bridge arm fault switching circuit (3), a load bridge arm (4) and a standby bridge arm (5), wherein the public bridge arm (1) is connected with each phase of load through a fuse, each phase of load is connected with each phase of load bridge arm (4) through the fuse, the public bridge arm (1) is connected with the standby bridge arm (5) through the public bridge arm fault switching circuit (3), and the load is connected with the standby bridge arm (5) through the load bridge arm fault switching circuit (2); The public bridge arm fault switching circuit (3) is composed of a bidirectional switch S n , one end of the bidirectional switch S n is connected between an upper pipe S n1 and a lower pipe S n2 of the public bridge arm (1) through a fuse, and the other end of the bidirectional switch S n is connected between an upper pipe S np and a lower pipe S dn of the standby bridge arm (5); The load bridge arm fault switching circuit (2) is composed of a bidirectional switch S a , a bidirectional switch S b , a bidirectional switch S c , a bidirectional switch S d and a bidirectional switch S e , The upper tube S n1 and the lower tube S n2 of the public bridge arm (1) are divided into two paths after being loaded by a fuse and an A phase, one path is connected with one end of the two-way switch S a , the other end of the two-way switch S a is connected between the upper tube S np and the lower tube S dn of the standby bridge arm (5), and the other path is connected between the upper tube S a1 and the lower tube S a2 of the load bridge arm (4) through the fuse; The upper tube S n1 and the lower tube S n2 of the public bridge arm (1) are divided into two paths after being loaded by a fuse and a B phase, one path is connected with one end of the two-way switch S b , the other end of the two-way switch S b is connected between the upper tube S np and the lower tube S dn of the standby bridge arm (5), and the other path is connected between the upper tube S b1 and the lower tube S b2 of the load bridge arm (4) by the fuse; the upper tube S n1 and the lower tube S n2 of the public bridge arm (1) are divided into two paths after being loaded by a fuse and a C phase, one path is connected with one end of the two-way switch S c , the other end of the two-way switch S c is connected between the upper tube S np and the lower tube S dn of the standby bridge arm (5), and the other path is connected between the upper tube S c1 and the lower tube S c2 of the load bridge arm (4) by the fuse; The upper tube S n1 and the lower tube S n2 of the public bridge arm (1) are loaded by a fuse and a D phase and then are divided into two paths, one path is connected with one end of the two-way switch S d , the other end of the two-way switch S d is connected between the upper tube S np and the lower tube S dn of the standby bridge arm (5), and the other path is connected between the upper tube S d1 and the lower tube S d2 of the load bridge arm (4) by the fuse; The upper tube S n1 and the lower tube S n2 of the public bridge arm (1) are loaded by fuses and E phases and then are divided into two paths, one path is connected with one end of the two-way switch S e , the other end of the two-way switch S e is connected between the upper tube S np and the lower tube S dn of the standby bridge arm (5), and the other path is connected between the upper tube S e1 and the lower tube S e2 of the load bridge arm (4) by the fuses.
2. The multi-bridge arm switching power amplifier circuit with the short circuit fault tolerance function according to claim 1, wherein the standby bridge arm (5) is an upper pipe S np and a lower pipe S dn which are connected in series, the common bridge arm (1) comprises an upper pipe S n1 and a lower pipe S n2 which are connected in series, an upper pipe S n1 and a lower pipe S n2 which are connected in series, and an upper pipe S np and a lower pipe S dn which are connected in series are connected in parallel to two ends of the power supply U dc .
3. The multi-arm switching power amplifier circuit with short-circuit fault tolerance function according to claim 1, wherein the load arm (4) comprises an upper pipe S a1 and a lower pipe S a2 connected in series, an upper pipe S b1 and a lower pipe S b2 connected in series, An upper pipe S c1 and a lower pipe S c2 which are connected in series, An upper pipe S d1 and a lower pipe S d2 connected in series, an upper pipe S e1 and a lower pipe S e2 connected in series, an upper pipe S a1 and a lower pipe S a2 connected in series, An upper pipe S b1 and a lower pipe S b2 which are connected in series, an upper pipe S c1 and a lower pipe S c2 which are connected in series, The upper and lower pipes S d1 and S d2 in series and the upper and lower pipes S e1 and S e2 in series are connected in parallel with both ends of the power supply U dc .

Description

Multi-bridge arm switching power amplifier circuit with short circuit fault tolerance function Technical Field The invention belongs to the technical field of magnetic bearing circuits, and particularly relates to a multi-bridge arm switch power amplifier circuit with a short circuit fault tolerance function. Background Compared with the traditional mechanical bearing, the magnetic suspension bearing has the outstanding advantages of no contact, no abrasion, no need of lubrication, high precision, low power consumption, adjustable and controllable damping and rigidity, intelligent control and the like, and is widely applied to the fields of turbomachinery, flywheel energy storage, aviation, medical treatment, nuclear energy and the like. In these fields, security and reliability are of great concern. The magnetic bearing system is used as a typical electromechanical integrated control system, has a complex structure, and is extremely easy to cause safety accidents once a fault occurs, so that how to further improve the safety and reliability during operation is the key of magnetic bearing technical research. In general, the application environment of the magnetic suspension bearing is special, and if the bearing fails, the result is often difficult to measure. The power amplifier of the magnetic suspension bearing is the most critical equipment in the whole closed-loop system, and the quality of the performance of the power amplifier basically determines the whole use effect of the magnetic suspension bearing. Therefore, the switching power amplifier system of the magnetic suspension bearing must have certain fault tolerance. In the running process of the magnetic suspension bearing system, the switching power amplifier topology is used for improving the dynamic response of the system, reducing current ripple waves and obtaining better control effect, the switching element is required to continuously switch different working modes under the working frequency of 10-100 kHz for a long time, open-circuit or short-circuit faults are very easy to occur due to overheat, overvoltage, overcurrent and the like, and fault-tolerant control cannot be realized by the self structure, namely, fault tolerance cannot be realized by a control algorithm. At present, almost all the retrieved data do not try fault-tolerant operation under the short-circuit fault, however, the failure situation of the switching tube is almost all short-circuit failure, and the disconnection failure is almost caused by the loss of a trigger signal and is not caused by the self-fault of the device. The current fault tolerance of circuit breaking is not of great practical importance in strict sense. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a multi-bridge arm switch power amplifier circuit with a short circuit fault tolerance function, wherein a standby bridge arm, a load bridge arm fault switching circuit and a public bridge arm fault switching circuit are added on the basis of a five-phase six-bridge arm switch power amplifier topology, a redundant structure is formed, and the public bridge arm is connected with a load and each phase of load bridge arm is connected with a corresponding load through fuses. The invention provides a multi-bridge arm switch power amplifier circuit with a short circuit fault tolerance function, which comprises a public bridge arm (1), a load bridge arm fault switching circuit (2), a public bridge arm fault switching circuit (3), a load bridge arm (4) and a standby bridge arm (5), wherein the public bridge arm (1) is connected with each phase of load through a fuse, each phase of load is connected with each phase of load bridge arm (4) through the fuse, the public bridge arm (1) is connected with the standby bridge arm (5) through the public bridge arm fault switching circuit (3), and the load is connected with the standby bridge arm (5) through the load bridge arm fault switching circuit (2). As a further technical scheme of the invention, the public bridge arm fault switching circuit (3) is composed of a bidirectional switch S n, one end of a switch tube S n is connected between an upper tube S n1 and a lower tube S n2 of the public bridge arm (1) through a fuse, and the other end of the switch tube S n is connected between an upper tube S np and a lower tube S dn of the standby bridge arm (5). Further, the standby bridge arm (5) is an upper pipe S np and a lower pipe S dn which are connected in series, the common bridge arm (1) comprises an upper pipe S n1 and a lower pipe S n2 which are connected in series, an upper pipe S n1 and a lower pipe S n2 which are connected in series, and an upper pipe S np and a lower pipe S dn which are connected in series are connected in parallel to two ends of the power supply U dc. Further, the load bridge arm fault switching circuit (2) is composed of a bidirectional switch S a, a bidirectional