Hybrid magnetic suspension bearing driver

Abstract

The utility model discloses a hybrid magnetic suspension bearing driver, comprising a rectifier bridge module, a flyback power supply module, an IPM module, a fault latch module, a microcontroller, an optocoupler isolation module, a current detection module and a coil of a magnetic suspension bearing to be controlled, the input end of the rectifier bridge circuit inputs alternating current, and the output end is connected with the flyback power supply module; the flyback power supply module outputs multiple paths of direct-current voltage, the IPM module adopts a three-phase full-bridge driving chip with the model of SDM10G60FB, and output pins of a W phase and a V phase of the IPM module are respectively connected with two ends of the coil. According to the utility model, the design of the flyback power supply and the driving module is improved, the overall circuit structure is simplified, and the safety performance of the driver is improved.

Description

Technical Field

[0001] The utility model belongs to the driving technology of magnetic levitation hybrid suspension, and particularly relates to a hybrid magnetic levitation bearing driver. Background Technique

[0002] Magnetic levitation technology refers to a technology that uses magnetic force to overcome gravity to suspend an object. A system adopting magnetic levitation technology generally consists of four parts: a rotor, a sensor, a controller, and a driver. The driver includes a power supply, a rectifier, a drive module, etc. Assuming that at the reference position, the rotor is subjected to a downward disturbance and will deviate from its reference position. At this time, the sensor detects the displacement of the rotor deviating from the reference point. The microcontroller serving as the controller detects the displacement change and then issues a control signal. Then the driver further converts this control signal into a control current, and the control current generates a magnetic force in the actuator magnet, thereby driving the rotor back to its original equilibrium position. Therefore, regardless of whether the rotor is subjected to a downward or upward disturbance, the rotor can always be in a stable equilibrium state.

[0003] At present, magnetic levitation bearing drivers are divided into active and hybrid types, which can achieve the balanced suspension of the motor and high-speed rotation in the suspended state. The problem with the active driver is the imbalance in one direction, mainly due to the bearing structure. In the hybrid driver, if the MOS tube is driven separately designed, the structures of its drive circuit and protection circuit are complex and the cost is high. Content of the Utility Model

[0004] Technical Objective: Aiming at the above technical problems, the utility model provides a hybrid magnetic levitation bearing driver, which improves the design of the flyback power supply and the drive module, simplifies the overall circuit structure, and improves the safety performance of the driver.

[0005] Technical Solution: To achieve the above technical objective, the utility model adopts the following technical solution:

[0006] A hybrid magnetic levitation bearing driver includes a rectifier bridge module, a flyback power supply module, an IPM module, a fault latching module, a microcontroller, an optocoupler isolation module, a current detection module, and a coil of the magnetic levitation bearing to be controlled. The input end of the rectifier bridge circuit inputs alternating current, and the output end is connected to the flyback power supply module, and the flyback power supply module outputs multiple paths of DC voltage;

[0007] The IPM module uses a three-phase full-bridge drive chip with the model of SDM10G60FB. The IPM module is provided with a three-phase full-bridge high-voltage gate drive circuit for W, V, and U phases. Each phase of the full-bridge high-voltage gate drive circuit is provided with a corresponding high-side transistor and a low-side transistor. The output pins of the W phase and the V phase are respectively connected to both ends of the coil. Sampling resistors are provided at the DC negative ends of the W phase and the V phase and are connected to the CSC pin of the IPM module through the sampling resistors;

[0008] The microcontroller is provided with a control signal output terminal, which is connected to the input terminal of the optocoupler isolation module; the optocoupler isolation module is provided with two PWM signal output terminals, which are respectively connected to the high-side signal input pin and the low-side signal input pin of the W phase and the V phase of the IPM module;

[0009] The fault latching module includes an inverter and a latch. The input terminal of the inverter is connected to the fault output pin of the IPM module, the output terminal of the inverter is connected to the input terminal of the latch, and the output terminal of the latch is connected to the microcontroller;

[0010] The current detection module is connected in series in the circuit where the output terminal of the IPM module is connected to the coil.

[0011] Preferably, the flyback power module includes a PWM modulator, a power switch tube chopper circuit, a high-frequency transformer step-down circuit, and a rectifier filter circuit. A power switch tube is provided in the power switch tube chopper circuit, and the PWM signal output terminal of the PWM modulator is connected to the gate of the power switch tube provided in the power switch tube circuit.

[0012] Preferably, the current detection module uses a current sensor and is connected in series in the circuit where the output terminal of the IPM module is connected to the coil.

[0013] Beneficial effects: Due to the adoption of the above technical solutions, the utility model has the following beneficial effects:

[0014] The hybrid magnetic levitation bearing driver of the utility model improves the design of the flyback power supply and the drive module, and the IPM chip used integrates various protection circuits such as undervoltage and short circuit, improving the safety performance of the driver. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a hybrid magnetic levitation bearing driver;

[0016] Figure 2 It is an electronic circuit diagram of the flyback power supply circuit;

[0017] Figure 3 It is an electronic circuit diagram of the IPM module SDM10G60FB drive circuit;

[0018] Figure 4 It is an electronic circuit diagram of the fault latch circuit. Detailed Embodiment

[0019] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0020] The utility model provides a hybrid magnetic levitation bearing driver.

[0021] 1. Composition and relationship of each component

[0022] As Figure 1 shown, the driver includes a rectifier bridge module, a flyback power module, an IPM module, a fault latching module, a microcontroller, an optocoupler isolation module, a current detection module, a coil, a bearing, etc.

[0023] The rectifier bridge module is mainly used to convert alternating current into smooth direct current.

[0024] The flyback power module is provided with a power switch tube chopper circuit, a high-frequency transformer step-down circuit, a rectifier filter circuit, a PWM modulator, etc. As Figure 2 shown, the power switch tube chopper circuit includes a power switch tube NM1, a zener diode D1, and several resistors. The gate of the power switch tube NM1 receives the driving signal generated by the PWM modulator. The negative electrode of the zener diode D1 is connected to the gate of the power switch tube NM1, the positive electrode is connected to the source of the power switch tube NM1, and the common connection point serves as the output node of the voltage feedback signal IS_V. The voltage feedback signal is input to the PWM modulator. The PWM modulator compares the voltage feedback signal IS_V with the internal reference signal, and the frequency of the generated driving signal is fixed while the pulse width can be adjusted according to the voltage feedback signal. The high-frequency transformer step-down circuit is provided with a high-frequency transformer T1. The rectifier filter circuit includes multiple filter circuits composed of diodes and electrolytic capacitors arranged on each secondary winding of the high-frequency transformer.

[0025] As Figure 3 shown, the IPM module uses a three-phase full-bridge drive IPM module with the model number SDM10G60FB. The range of the VBS voltage (voltage between VB and VS) of the IPM module is between 13.5V - 16.5V to ensure normal driving of the high-side IGBT / MOS. In this embodiment, a bootstrap circuit is designed on the periphery of the chip, and a traditional isolated power supply for driving the high and low side transistors is no longer required.

[0026] The chip integrates a three-phase full-bridge high-voltage gate drive circuit of W, V, and U phases and 6 low-loss IGBT tubes, providing excellent protection and a wide safe operating range. SDM10G60FB integrates various protection functions such as undervoltage, short circuit, and overheating. Each phase has an independent negative DC terminal for the application of inverter current detection. In addition, it is compatible with 3.3V and 5V MCU interfaces, with high-level validity, and adopts an Al2O3 DBC design, having low thermal resistance and an insulation level of 1500Vrms / min, ensuring the safety and reliability of the device.

[0027] The microcontroller is provided with a control signal output terminal, which is connected to the input terminal of the optocoupler isolation module. The output pins of the W phase and V phase of the IPM module are respectively connected to both ends of the coil. Sampling resistors are provided at the DC negative terminals of the W phase and V phase and are connected to the CSC pin of the IPM module through the sampling resistors. The high-side signal input pins and low-side signal input pins of the W phase and V phase are respectively connected to two paths of PWM signals output by the optocoupler isolation module. The signals input to the optocoupler isolation module are two pairs of complementary signals generated by the microcontroller, and after being processed by optocoupler isolation, they are input to the IPM module.

[0028] The current detection module can be implemented by a current sensor and is connected in series in the circuit where the IPM module is connected to the coil.

[0029] As Figure 4 shown in the specific example of the fault latching module, it includes an inverter, a latch and their peripheral circuits provided outside the IPM module. The input terminal of the inverter is connected to the fault output pin VFO of the IPM module, the output terminal of the inverter is connected to the input terminal of the latch, and the output terminal of the latch sends a fault feedback signal to the microcontroller to realize the alarm function when the IPM has low-side undervoltage and overcurrent protection.

[0030] A soft start module can also be set between the rectifier bridge module and the flyback power module, which is mainly used to prevent a large impact surge current from passing through suddenly and causing harm to the subsequent circuit or load.

[0031] 2. Working principle

[0032] The working principle of the hybrid magnetic levitation bearing driver with the above design is as follows:

[0033] (1). The alternating current is converted into smooth high-voltage direct current through the rectifier bridge module;

[0034] (2). The rectified high-voltage direct current enters the flyback power module. After being chopped by the power switch tube and stepped down by the high-frequency transformer, a high-frequency rectangular wave voltage is obtained, and then through rectification and filtering, output direct currents of 24V, ±15V, 9V, etc. are obtained; The PWM modulator generates a driving signal with a fixed frequency and a pulse width adjustable with the feedback signal to control the on and off time of the switch tube, so as to achieve a stable output voltage and current;

[0035] (3). The microcontroller generates complementary PWM signals and inputs them into the IPM module through the isolator optocoupler HGD341W; As Figure 3 shown, PWMH1 / PWML1, PWMH2 / PWML2 are two pairs of complementary signals generated by the microcontroller to achieve precise control of the motor and are transmitted to the IPM module through the optocoupler;

[0036] The voltages detected by the sampling resistors at the DC terminals of the W-phase and V-phase are sent to the CSC port of the IPM module. If they exceed the internal reference voltage, the / FO* port of the chip, i.e., the fault output pin, will output an alarm signal VFO1 and turn off the high-side and low-side MOS transistors; the output pins of the W-phase and V-phase of the IPM module are connected to both ends of the coil.

[0037] (4) The large current signal output by the IPM module enters the coil of the magnetic levitation bearing to be controlled, generating magnetic force. The current detection module collects the current in the input coil and feeds it back to the microcontroller for real-time monitoring to achieve the purpose of protecting the circuit.

[0038] The design of the present utility model utilizes various protection mechanisms of the SDM10G60FB, such as undervoltage protection, short-circuit protection, and over-temperature protection, etc., improving the safety performance of the entire driver and simplifying the overall circuit design.

[0039] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the above embodiments do not limit the present utility model in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations fall within the protection scope of the present utility model.

Claims

1. A hybrid magnetic levitation bearing driver, characterized in that: It includes a rectifier bridge module, a flyback power module, an IPM module, a fault latching module, a microcontroller, an optocoupler isolation module, a current detection module, and the coil of the magnetic levitation bearing to be controlled. The input end of the rectifier bridge module inputs alternating current, and the output end is connected to the flyback power module, and the flyback power module outputs multiple DC voltages; The IPM module uses a three-phase full-bridge drive chip with the model number SDM10G60FB. The IPM module is provided with three-phase full-bridge high-voltage gate drive circuits for phases W, V, and U. Each phase of the full-bridge high-voltage gate drive circuit is provided with a corresponding high-side transistor and a low-side transistor. The output pins of phases W and V are respectively connected to both ends of the coil. Sampling resistors are provided at the DC negative ends of phases W and V and are connected to the CSC pin of the IPM module through the sampling resistors; The microcontroller is provided with a control signal output end, which is connected to the input end of the optocoupler isolation module; the optocoupler isolation module is provided with two PWM signal output ends, which are respectively connected to the high-side signal input pin and the low-side signal input pin of phases W and V of the IPM module; The fault latching module includes an inverter and a latch. The input end of the inverter is connected to the fault output pin of the IPM module, the output end of the inverter is connected to the input end of the latch, and the output end of the latch is connected to the microcontroller; The current detection module is connected in series in the circuit where the output terminal of the IPM module is connected to the coil.

2. The hybrid magnetic levitation bearing driver according to claim 1, characterized in that: The flyback power module includes a PWM modulator, a power switch tube chopping circuit, a high-frequency transformer step-down circuit, and a rectifier and filter circuit. A power switch tube is provided in the power switch tube chopping circuit, and the PWM signal output end of the PWM modulator is connected to the gate of the power switch tube provided in the power switch tube circuit.

3. A hybrid magnetic levitation bearing driver according to claim 1, characterized in that: The current detection module uses a current sensor and is connected in series in the circuit where the output terminal of the IPM module is connected to the coil.

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