Three-phase power bridge dual-redundancy circuit

Abstract

The utility model discloses a three-phase power bridge dual-redundancy circuit, and belongs to the technical field of motor control. Comprising a main bridge arm circuit, a standby bridge arm circuit, a first current sampling module, a second current sampling module and an MCU. Three output ports of the main bridge arm circuit are respectively connected with three ports of the three-phase motor through the fusing circuit; the standby bridge arm circuit is respectively connected with three ports of the three-phase motor; the main bridge arm circuit and the standby bridge arm circuit are respectively connected with the MCU through the output of the first current sampling module and the output of the second current sampling module, and the MCU is connected with the main bridge arm circuit, the standby bridge arm circuit and the fusing circuit and is used for switching the main bridge arm circuit and the standby bridge arm circuit. The utility model provides the power bridge dual-redundancy control circuit, the circuit adopts a dual-bridge mode, when one bridge arm is abnormal, the other bridge arm is switched to work, and the redundancy design ensures the stability and safety of motor control.

Description

Technical Field

[0001] This utility model relates to the field of motor control technology, and in particular to a three-phase power bridge dual-redundant circuit. Background Technology

[0002] Miniature motors are widely used in all aspects of our lives, playing a significant role in people's production and daily life. Therefore, controlling the motor is crucial to ensure its normal operation. Current motor control circuits are relatively complex and lack a certain level of reliability, failing to meet the requirements for high reliability and stability in motor systems to some extent. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a redundant control circuit for motors, which can control the motor. Furthermore, due to the redundant design, it can ensure that if one control circuit fails, it can be switched to another control circuit in a timely manner, thus ensuring the control of the motor.

[0004] To achieve the above objectives, this utility model provides a three-phase power bridge dual redundancy circuit, including: a main bridge arm circuit, a spare bridge arm circuit, a first current sampling module, a second current sampling module, and an MCU;

[0005] The three output ports of the main bridge arm circuit are respectively connected to the three ports of the three-phase motor through fuse circuits; the first current sampling module is connected to the main bridge arm circuit for current sampling.

[0006] The spare bridge arm circuit is connected to the three ports of the three-phase motor respectively; the second current sampling module is connected to the spare bridge arm circuit for current sampling.

[0007] The outputs of the first current sampling module and the second current sampling module are connected to the MCU. The output of the MCU is connected to the main bridge arm circuit, the backup bridge arm circuit, and the fuse circuit. The MCU sends drive signals to the main bridge arm circuit and the backup bridge arm circuit, and sends fuse signals to the fuse circuit for switching between the main bridge arm circuit and the backup bridge arm circuit.

[0008] Furthermore, the main bridge arm circuit includes three half-bridges connected in parallel, each half-bridge including a first MOS transistor and a second MOS transistor connected in series; the MCU is connected to the gates of all MOS transistors through a first MOS drive circuit.

[0009] In each half-bridge, the source of the first MOSFET is connected to the drain of the second MOSFET; the drains of the first MOSFETs in the three half-bridges are connected together and then connected to the power supply through the first fuse circuit; the sources of the second MOSFETs in the three half-bridges are connected to each other and then connected to the first current sampling circuit, and further grounded through the second fuse circuit.

[0010] The outputs at the midpoint of the first and second MOSFETs in each half-bridge are connected to the three ports of the three-phase motor via the third, fourth, and fifth fuse circuits, respectively.

[0011] Furthermore, the MCU sends a fuse signal to the first fuse circuit, the second fuse circuit, the third fuse circuit, the fourth fuse circuit, and the fifth fuse circuit.

[0012] Furthermore, the spare bridge arm circuit includes three half-bridges connected in parallel, each half-bridge including a third MOS transistor and a fourth MOS transistor connected in series; the MCU is connected to the gates of all MOS transistors through a second MOS drive circuit.

[0013] In each half-bridge, the source of the third MOSFET is connected to the drain of the fourth MOSFET; the drains of the third MOSFETs in the three half-bridges are connected to the power supply; the sources of the fourth MOSFETs in the three half-bridges are connected to each other and then connected to the second current sampling circuit, and further grounded through the three-phase motor winding abnormality detection circuit.

[0014] The outputs at the midpoint of the third and fourth MOSFETs in each half-bridge are connected to the three ports of the three-phase motor, respectively.

[0015] Furthermore, the three-phase motor winding abnormality detection circuit consists of an inductor and a MOSFET connected in parallel, and the MCU is connected to the gate of the MOSFET through a third MOSFET drive circuit.

[0016] The beneficial effects of this utility model are:

[0017] This invention provides a power bridge dual-redundant control circuit. The circuit adopts a dual-bridge mode. When one bridge arm malfunctions, it switches to the other bridge arm to work. This redundancy design ensures the smoothness and safety of motor control. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a three-phase power bridge dual-redundancy circuit according to an embodiment of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1As shown in the figure, this utility model embodiment provides a three-phase power bridge dual-redundancy circuit, including two bridge arm circuits (main bridge arm circuit (bridge arm 1) and spare bridge arm circuit (bridge arm 2)), two current sampling modules (first current sampling module and second current sampling module), and an MCU. The three output ports of the main bridge arm circuit are respectively connected to the three ports of the three-phase motor through fuses, and the three output ports of the spare bridge arm circuit are directly connected to the three ports of the three-phase motor. The first current sampling module and the second current sampling module are respectively connected to the main bridge arm circuit and the spare bridge arm circuit to sample the current. The outputs of the first current sampling module and the second current sampling module are connected to the MCU, and the output of the MCU is connected to the main bridge arm circuit, the spare bridge arm circuit, and the fuses, sending drive signals to the main bridge arm circuit and the spare bridge arm circuit, and sending fuse signals to the fuses for switching between the main bridge arm circuit and the spare bridge arm circuit.

[0021] Both the main bridge arm circuit and the standby bridge arm circuit contain three half-bridges connected in parallel, and each half-bridge includes two MOSFETs connected in series. The MCU connects the gates of the MOSFETs in the main bridge arm circuit and the standby bridge arm circuit through a first MOSFET drive circuit, a second MOSFET drive circuit, and a third MOSFET drive circuit.

[0022] In the main bridge arm circuit, each half-bridge consists of a first MOSFET and a second MOSFET connected in series, with the source of the first MOSFET connected to the drain of the second MOSFET. The drains of each first MOSFET in the three half-bridges are connected together and then connected to the power supply via a first fuse circuit. The sources of each second MOSFET are connected together and then connected to a first current sampling circuit, and further grounded via a second fuse circuit. The output at the midpoint of each first and second MOSFET is connected to the three ports of the three-phase motor via third, fourth, and fifth fuse circuits, respectively. The MCU sends fuse signals to the first, second, third, fourth, and fifth fuse circuits. The MCU is connected to the gates of all MOSFETs in the main bridge arm circuit via a first MOSFET driver circuit.

[0023] In the spare bridge arm circuit, each half-bridge consists of a third MOSFET and a fourth MOSFET connected in series, with the source of the third MOSFET connected to the drain of the fourth MOSFET. The drains of each third MOSFET in the three half-bridges are connected together and then connected to the power supply; the sources of each fourth MOSFET in the three half-bridges are connected together and then connected to the second current sampling circuit, and further grounded through the three-phase motor winding anomaly detection circuit; the outputs at the midpoint of each third and fourth MOSFET are connected to the three ports of the three-phase motor. The three-phase motor winding anomaly detection circuit consists of an inductor and a MOSFET connected in parallel. The MCU is connected to the gates of all the MOSFETs in the three half-bridges through the second MOSFET driver circuit, and to the gates of the MOSFETs in the three-phase motor winding anomaly detection circuit through the third MOSFET driver circuit.

[0024] Its working principle is as follows:

[0025] First, the main bridge arm circuit connects to the power supply and the three-phase motor. Through the first current sampling circuit signal, the MCU's overcurrent detection can detect whether the main bridge arm circuit is abnormally short-circuited. When an abnormal short circuit is detected, the MCU can restart the main bridge arm circuit by resetting. If the abnormal short circuit fault is confirmed, the MCU sends a fuse signal to each fuse circuit, blowing the three-terminal fuses. At this time, the physical connection between the main bridge arm circuit, the power supply, and the three-phase motor is severed. Immediately after this, the backup bridge arm circuit is started, restoring control of the three-phase motor. After the backup bridge arm starts, it first energizes each of the three-phase motor windings individually. The MOSFET (MOS13) in the three-phase motor winding abnormality detection circuit is not conducting, and the phase current flows through the inductor L. By detecting the current rise slope, it can be determined whether the phase winding is short-circuited. During normal operation, the MOSFET (MOS13) in the three-phase motor winding abnormality detection circuit is conducting, and the inductor L is short-circuited.

[0026] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A three-phase power bridge dual-redundancy circuit, characterized in that, include: Main bridge arm circuit, spare bridge arm circuit, first current sampling module, second current sampling module and MCU; The three output ports of the main bridge arm circuit are respectively connected to the three ports of the three-phase motor through fuse circuits; the first current sampling module is connected to the main bridge arm circuit for current sampling. The spare bridge arm circuit is connected to the three ports of the three-phase motor respectively; the second current sampling module is connected to the spare bridge arm circuit for current sampling. The outputs of the first current sampling module and the second current sampling module are connected to the MCU. The output of the MCU is connected to the main bridge arm circuit, the backup bridge arm circuit, and the fuse circuit. The MCU sends drive signals to the main bridge arm circuit and the backup bridge arm circuit, and sends fuse signals to the fuse circuit for switching between the main bridge arm circuit and the backup bridge arm circuit.

2. The three-phase power bridge dual-redundancy circuit according to claim 1, characterized in that: The main bridge arm circuit includes three half-bridges connected in parallel, each half-bridge including a first MOS transistor and a second MOS transistor connected in series; the MCU is connected to the gate of all MOS transistors through the first MOS drive circuit. In each half-bridge, the source of the first MOSFET is connected to the drain of the second MOSFET; the drains of the first MOSFETs in the three half-bridges are connected together and then connected to the power supply through the first fuse circuit; the sources of the second MOSFETs in the three half-bridges are connected to each other and then connected to the first current sampling module, and further grounded through the second fuse circuit. The outputs at the midpoint of the first and second MOSFETs in each half-bridge are connected to the three ports of the three-phase motor via the third, fourth, and fifth fuse circuits, respectively.

3. The three-phase power bridge dual-redundancy circuit according to claim 2, characterized in that: The MCU sends a fuse signal to the first fuse circuit, the second fuse circuit, the third fuse circuit, the fourth fuse circuit, and the fifth fuse circuit.

4. The three-phase power bridge dual-redundancy circuit according to claim 1, characterized in that: The spare bridge arm circuit includes three half-bridges connected in parallel, each half-bridge including a third MOS transistor and a fourth MOS transistor connected in series; the MCU is connected to the gates of all MOS transistors through a second MOS drive circuit. In each half-bridge, the source of the third MOSFET is connected to the drain of the fourth MOSFET; the drains of the third MOSFETs in the three half-bridges are connected to the power supply; the sources of the fourth MOSFETs in the three half-bridges are connected to each other and then connected to the second current sampling module, and further grounded through the three-phase motor winding abnormality detection circuit. The outputs at the midpoint of the third and fourth MOSFETs in each half-bridge are connected to the three ports of the three-phase motor, respectively.

5. The three-phase power bridge dual-redundancy circuit according to claim 4, characterized in that: The three-phase motor winding abnormality detection circuit consists of an inductor and a MOS transistor connected in parallel. The MCU is connected to the gate of the MOS transistor through a third MOS drive circuit.

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