WO2023131188A1

WO2023131188A1 - Power supply circuit and system for magnetic bearing

Info

Publication number: WO2023131188A1
Application number: PCT/CN2023/070460
Authority: WO
Inventors: 罗玉均
Original assignee: 重庆美的通用制冷设备有限公司; 美的集团股份有限公司
Priority date: 2022-01-07
Filing date: 2023-01-04
Publication date: 2023-07-13
Also published as: CN116455215A

Abstract

Provided in the present disclosure are a power supply circuit and system for a magnetic bearing. The power supply circuit comprises: a first voltage output circuit, a second voltage output circuit and a voltage output control circuit. The first voltage output circuit and the voltage output control circuit are both connected to a frequency converter bus; the voltage output control circuit, the first voltage output circuit and the second voltage output circuit are connected in pairs; and the second voltage output circuit is connected to a driving controller of a magnetic bearing. The voltage output control circuit receives a first voltage input by the frequency converter bus, controls, according to rise and drop of the first voltage, the first voltage output circuit to switch between a BUCK mode and a BOOST mode, and outputs a second voltage; and the voltage output control circuit further performs, according to the rise and drop of the second voltage, full-bridge inversion on the second voltage output circuit and outputs a third voltage to the driving controller. The present disclosure can carry out reliable power supply to a magnetic bearing under the condition of wide voltage power supply.

Description

Power supply circuit and system of magnetic suspension bearing

Cross References to Related Applications

This disclosure claims the priority of the Chinese patent application with application number 202210016646.3 and titled "Power Supply Circuit and System for Magnetic Suspension Bearing" filed with the State Intellectual Property Office of China on January 07, 2022, the entire contents of which are incorporated by reference in this disclosure middle.

technical field

The present disclosure relates to the technical field of power supply, in particular to a power supply circuit and system of a magnetic suspension bearing.

Background technique

For magnetic bearings to operate stably, a wide voltage input range is a key parameter. The wider the input voltage of the input bearing power supply, the lower the bearing backup speed will be in the case of abnormal power failure. When the input voltage is lower than the back electromotive force voltage of the drive controller’s safe landing speed, the bearing can be powered down for unlimited times. , So as to fundamentally solve the problem that the bearing has a narrow power input voltage range, which causes the bearing to fall at a higher speed, resulting in damage to the backup bearing or equipment damage.

The power supply scheme of the magnetic suspension bearing in the related art is a power supply scheme that uses BUCK mode to step down the voltage. In this mode of operation, the output voltage can only work normally when the output voltage is less than or equal to the input voltage, which makes the voltage range of the input magnetic suspension bearing Smaller, it is not conducive to the safe backup of the magnetic suspension bearing.

Contents of the invention

The present disclosure provides a power supply circuit and system of a magnetic suspension bearing, which can at least provide reliable power supply to the magnetic suspension bearing under the condition of wide voltage power supply.

Some embodiments of the present disclosure provide a power supply circuit for a magnetic suspension bearing. The power supply circuit may include: a first voltage output circuit based on a BUCK-BOOST topology, a second voltage output circuit based on an inverter rectification structure, and a voltage output control circuit; Both the first voltage output circuit and the voltage output control circuit are connected to the bus bar of the frequency converter; the voltage output control circuit, the first voltage output circuit and the second voltage output circuit are connected in pairs; the second voltage output circuit is connected to the drive controller of the magnetic suspension bearing; the voltage The output control circuit is configured to receive the first voltage input by the inverter bus, and control the first voltage output circuit to switch between the BUCK mode and the BOOST mode according to the rise and fall of the first voltage, so that the output of the first voltage output circuit changes A second voltage whose amplitude is smaller than the threshold value; the voltage output control circuit is also configured to control the second voltage output circuit to perform full-bridge inversion and rectification according to the rise and fall of the second voltage, so that the second voltage output circuit sends the drive controller output a third voltage.

In some embodiments, the above-mentioned voltage output control circuit may include: a first voltage detection circuit, a second voltage detection circuit and a power control circuit; the first voltage detection circuit is respectively connected to the inverter bus and the power control circuit; the second voltage detection circuit The circuits are respectively connected to the first voltage output circuit and the power control circuit; the power control circuit is respectively connected to the first voltage output circuit and the second voltage output circuit; the first voltage detection circuit is configured to detect the first voltage of the inverter bus input in real time voltage, and output the first voltage to the power control circuit; the power control circuit is configured to control the first voltage output circuit to work in BUCK mode when the first voltage rises to the upper limit voltage value, and to control the first voltage output circuit to work in BUCK mode when the first voltage drops to the lower limit voltage value, control the first voltage output circuit to work in the BOOST mode, so that the first voltage output circuit outputs a second voltage whose variation range is smaller than the threshold value; the second voltage detection circuit is also configured to detect the output of the first voltage output circuit in real time second voltage, and output the second voltage to the power control circuit; the power control circuit is further configured to control the second voltage output circuit to output a third voltage according to the variation of the second voltage.

In some embodiments, the above-mentioned first voltage output circuit may include: a BUCK-BOOST topology circuit; the BUCK-BOOST topology circuit includes: a first capacitor, a second capacitor, a first insulated gate bipolar transistor, a second insulated The gate bipolar transistor, the first inductance, the first diode and the second diode; the anode of the first capacitor and the collector of the first insulated gate bipolar transistor are all connected to the positive pole of the inverter bus; the first insulation The gate of the gate bipolar transistor and the gate of the second insulated gate bipolar transistor are both connected to the power control circuit; the emitter of the first insulated gate bipolar transistor is respectively connected to the cathode of the first diode and the first inductor One end of the first inductor; the other end of the first inductance is respectively connected to the collector of the second IGBT and the anode of the second diode; the cathode of the second diode is connected to the anode of the second capacitor; the cathode of the first capacitor , the anode of the first diode, the emitter of the second IGBT and the cathode of the second capacitor are all connected to the negative pole of the inverter bus; the anode and cathode of the second capacitor are connected to the second voltage detection circuit and the second capacitor Two-voltage output circuit; the power control circuit is configured to output the first voltage to the gate of the first insulated gate bipolar transistor and the gate of the second insulated gate bipolar transistor respectively when the first voltage rises to the upper limit voltage value A driving voltage and a second driving voltage, so that the second IGBT is turned off, so that the first IGBT, the first diode, the first inductor and the second capacitor form a BUCK loop; the power supply The control circuit is further configured to output the third drive voltage and the second drive voltage to the gate of the first IGBT and the gate of the second IGBT respectively when the first voltage drops to the lower limit voltage value. Four drive voltages, so that the first IGBT is turned on, and the second IGBT, the second diode, the first inductor and the second capacitor form a BOOST loop.

In some embodiments, the above-mentioned first voltage output circuit may further include: a first smoothing circuit; the first smoothing circuit is connected to the BUCK-BOOST topology circuit; the first smoothing circuit is configured to be used in the BUCK-BOOST topology When the structural circuit works in BOOST mode, the fluctuation of the second voltage output by the first voltage output circuit is suppressed.

In some embodiments, the above-mentioned first smoothing circuit may include: a third insulated gate bipolar transistor, a second inductor, and a third diode; one end of the second inductor is connected to the cathode of the first diode, and the second The other end of the inductance is respectively connected to the collector of the third IGBT and the anode of the third diode; the gate of the third IGBT is connected to the power control circuit, and the emitter is connected to the inverter bus Negative electrode; the cathode of the third diode is connected with the cathode of the second diode.

In some embodiments, the above-mentioned second voltage output circuit may include: an H-bridge inverter circuit and a full-bridge rectifier circuit; the H-bridge inverter circuit is respectively connected to the BUCK-BOOST topology circuit, the power control circuit, and the full-bridge rectifier circuit; The full-bridge rectifier circuit is connected to the drive controller of the magnetic suspension bearing; the power supply control circuit is configured to output a control signal to the H-bridge inverter circuit according to the variation of the second voltage, so that the H-bridge inverter circuit performs inverse Modulation and rectification by a full-bridge rectifier circuit to output a third voltage to the drive controller of the magnetic suspension bearing.

In some embodiments, the above-mentioned second voltage output circuit may further include: a second smoothing circuit; the second smoothing circuit is connected to the full-bridge rectification circuit; the second smoothing circuit is configured to suppress the output of the full-bridge rectification circuit fluctuations in the third voltage.

In some embodiments, the H-bridge inverter circuit includes an H-bridge structure circuit composed of four insulated gate bipolar transistors; the full-bridge rectifier circuit is a bridge structure circuit composed of four diodes.

In some embodiments, the above-mentioned second smoothing circuit may include: a third inductor and a third capacitor; one end of the third inductor is connected to the voltage output terminal on one side corresponding to the cathode of the diode in the full-bridge rectifier circuit, and the other end of the third inductor The anode of the third capacitor is connected; the cathode of the third capacitor is connected to the drive controller of the magnetic suspension bearing with the voltage output terminal on the side corresponding to the anode of the diode in the full-bridge rectifier circuit.

In some embodiments, the difference between the upper limit voltage value and the lower limit voltage value may be greater than a preset threshold.

Other embodiments of the present disclosure also provide a power supply system for a magnetic suspension bearing, the power supply system for the magnetic suspension bearing may include a magnetic suspension bearing and a power supply circuit for the magnetic suspension bearing as described in the previously described embodiments; the power supply circuit for the magnetic suspension bearing The input terminal of the magnetic suspension bearing is connected to the bus bar of the frequency converter; the output terminal of the power supply circuit of the magnetic suspension bearing is connected to the drive controller of the magnetic suspension bearing.

In the power supply circuit and system of a magnetic suspension bearing provided by an embodiment of the present disclosure, the power supply circuit includes: a first voltage output circuit based on a BUCK-BOOST topology, a second voltage output circuit based on an inverter rectification structure, and a voltage output control circuit The first voltage output circuit and the voltage output control circuit are both connected to the frequency converter bus; the voltage output control circuit, the first voltage output circuit and the second voltage output circuit are connected in pairs; the second voltage output circuit is connected to the drive controller of the magnetic suspension bearing; The voltage output control circuit is configured to receive the first voltage input by the inverter bus, and control the first voltage output circuit to switch between the BUCK mode and the BOOST mode according to the rise and fall of the first voltage, so that the first voltage output circuit outputs The second voltage whose variation amplitude is smaller than the threshold value; the voltage output control circuit is also configured to control the second voltage output circuit to perform full-bridge inversion and rectification processing according to the rise and fall of the second voltage, so that the second voltage output circuit provides the drive control The device outputs a third voltage. In the power supply circuit provided in the embodiment of the present disclosure, the first-level power supply uses BUCK+BOOST topology as the power supply to realize wide voltage input, the first-level output is stable in a small fluctuation range, and the second-level power supply uses the full-bridge inverter and rectifier circuit as the second-level power supply circuit. Level power supply, by detecting the output voltage of the first level, controlling the full-bridge inverter and rectification, and controlling the precise second-level output, so as to adapt to the reliable power supply of the magnetic suspension bearing under the condition of wide-voltage power supply.

Description of drawings

In order to more clearly illustrate the technical solutions in the specific embodiments of the present disclosure or related technologies, the following will briefly introduce the drawings that need to be used in the specific embodiments or descriptions of related technologies. Obviously, the accompanying drawings in the following description are For some embodiments of the present disclosure, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural block diagram of a power supply circuit of a magnetic suspension bearing provided by some embodiments of the present disclosure;

Fig. 2 is a structural block diagram of another power supply circuit of a magnetic suspension bearing provided by some embodiments of the present disclosure;

Fig. 3 is a schematic circuit structure diagram of a first voltage output circuit and a voltage output control circuit provided by some embodiments of the present disclosure;

FIG. 4 is a schematic diagram of a control circuit in BUCK mode provided by some embodiments of the present disclosure;

FIG. 5 is a schematic diagram of a control equivalent circuit in BUCK mode provided by some embodiments of the present disclosure;

FIG. 6 is a schematic diagram of a control circuit in BOOST mode provided by some embodiments of the present disclosure;

FIG. 7 is a schematic diagram of a control equivalent circuit in BOOST mode provided by some embodiments of the present disclosure;

FIG. 8 is a structural block diagram of a second voltage output circuit provided by some embodiments of the present disclosure;

FIG. 9 is a circuit diagram of a second voltage output circuit provided by some embodiments of the present disclosure;

Fig. 10 is a complete circuit diagram of a power supply circuit of a magnetic suspension bearing provided by some embodiments of the present disclosure.

Detailed ways

The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present disclosure.

At present, the power supply scheme of the magnetic suspension bearing is a power supply scheme using BUCK mode for step-down. In this mode of power supply, the output voltage can only work normally when the output voltage is less than or equal to the input voltage, which makes the input voltage range of the magnetic suspension bearing smaller. , which is not conducive to the safe backup of the magnetic suspension bearing. Based on this, embodiments of the present disclosure provide a power supply circuit and system for a magnetic suspension bearing, capable of reliably supplying power to the magnetic suspension bearing under the condition of wide voltage power supply.

To facilitate the understanding of this embodiment, a power supply circuit for a magnetic suspension bearing disclosed in an embodiment of the present disclosure is firstly introduced in detail.

The power supply circuit of the magnetic suspension bearing provided according to the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

An embodiment of the present disclosure provides a power supply circuit for a magnetic suspension bearing. Referring to FIG. 1 , the power supply circuit may include: a first voltage output circuit 11 based on a BUCK-BOOST topology, and a second voltage output circuit based on an inverter rectification structure 12 and a voltage output control circuit 13; the first voltage output circuit 11 and the voltage output control circuit 13 are all connected to the frequency converter bus; the voltage output control circuit 13, the first voltage output circuit 11 and the second voltage output circuit 12 are connected in pairs; The two-voltage output circuit 12 is connected to the drive controller of the magnetic suspension bearing.

The voltage output control circuit 13 can be configured to receive the first voltage input by the inverter bus, and control the first voltage output circuit 11 to switch between the BUCK mode and the BOOST mode according to the rise and fall of the first voltage, so that the first voltage The output circuit 11 outputs a second voltage whose variation range is smaller than the threshold value; the voltage output control circuit 13 can also be configured to control the second voltage output circuit 12 to perform full-bridge inversion and rectification processing according to the rise and fall of the second voltage, so that the first The two-voltage output circuit 12 outputs the third voltage to the drive controller.

During specific implementation, the first voltage of the frequency converter busbar gradually increases from 0 when the unit is powered on, and when it rises to the start-up voltage of the power supply circuit, the first voltage output circuit 11 starts to operate in BUCK mode, and the voltage output control circuit 13 during operation Real-time detection of the inverter bus voltage, when the first voltage of the inverter bus reaches the preset rising voltage threshold, the first voltage output circuit 11 is controlled to operate in BUCK mode to ensure that the primary output voltage is relatively stable, and the secondary output voltage within design accuracy. When the first voltage of the inverter bus is below the preset falling voltage threshold, the first voltage output circuit 11 is controlled to operate in BOOST mode, so as to ensure that the primary output voltage is relatively stable and the secondary output voltage is within the design accuracy.

When the first voltage output circuit 11 outputs the second voltage whose change amplitude is smaller than the threshold value, the voltage output control circuit 13 also detects the rise and fall of the second voltage in real time, so as to control the second voltage output circuit 12 to perform full-bridge inversion and rectification processing, Therefore, the third voltage is output to the drive controller of the magnetic suspension bearing through the second voltage output circuit 12 to ensure that the secondary output voltage is within the design accuracy.

The magnetic levitation drive controller is powered by the third voltage, and the drive controller adjusts the drive current of the magnetic levitation bearing in real time according to the bearing position to achieve precise control of the bearing position.

In the power supply circuit provided in the embodiment of the present disclosure, the primary power supply uses the BUCK+BOOST topology as the power supply to realize wide voltage input, the primary output is stable in a small fluctuation range, and the secondary circuit is used as a secondary circuit through a full-bridge inverter and rectifier circuit. The first-stage power supply controls the full-bridge inverter and rectification process by detecting the first-stage output voltage, and controls the precise second-stage output, so as to adapt to the reliable power supply of the magnetic suspension bearing under the condition of wide-voltage power supply.

The power supply circuit of the magnetic suspension bearing provided according to the embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings

The embodiment of the present disclosure also provides a power supply circuit for a magnetic suspension bearing. This embodiment is implemented on the basis of the previous embodiment. This embodiment focuses on the details of the voltage output control circuit, the first voltage output circuit and the second voltage output circuit. Circuit structure and working principle.

Referring to Fig. 2, above-mentioned voltage output control circuit 13 can comprise: first voltage detection circuit 131, second voltage detection circuit 132 and power supply control circuit 133; Connection; the second voltage detection circuit 132 is connected with the first voltage output circuit 11 and the power control circuit 133 respectively; the power control circuit 133 is connected with the first voltage output circuit 11 and the second voltage output circuit 12 respectively.

The first voltage detection circuit 131 can be configured to detect the first voltage input by the inverter bus in real time, and output the first voltage to the power control circuit 133; the power control circuit 133 can be configured to be used when the first voltage rises to the upper limit voltage value, the first voltage output circuit 11 is controlled to work in the BUCK mode, and when the first voltage drops to the lower limit voltage value, the first voltage output circuit 11 is controlled to work in the BOOST mode, so that the first voltage output circuit 11 outputs the variation range The second voltage is less than the threshold; the second voltage detection circuit 132 can also be configured to detect the second voltage output by the first voltage output circuit 11 in real time, and output the second voltage to the power control circuit 133; the power control circuit 133 also It can be configured to control the second voltage output circuit 12 to output the third voltage according to the variation of the second voltage.

The difference between the upper limit voltage value and the lower limit voltage value may be greater than the preset threshold, that is, to ensure that the difference between the upper limit voltage value and the lower limit voltage value reaches a certain value, so that when the first voltage of the inverter bus changes up and down The first voltage output circuit can be controlled to switch frequently between the BUCK mode and the BOOST mode. Further, the second voltage output by the first voltage output circuit can be stabilized within a small fluctuation range.

Referring to FIG. 3, the first voltage output circuit may include a BUCK-BOOST topology circuit; the BUCK-BOOST topology circuit includes: a first capacitor C1, a second capacitor C2, a first insulated gate bipolar transistor Q1, a first Two IGBTs Q2, a first inductor L1, a first diode D1 and a second diode D2.

Wherein, the anode of the first capacitor C1 and the collector of the first IGBT Q1 are connected to the positive pole P+ of the inverter bus; the gate of the first IGBT Q1 and the second IGBT The gates of the transistor Q2 are both connected to the power control circuit; the emitters of the first IGBT Q1 are respectively connected to the cathode of the first diode D1 and one end of the first inductor L1; the other ends of the first inductor L1 are respectively connected to The collector of the second insulated gate bipolar transistor Q2 and the anode of the second diode D2; the cathode of the second diode D2 is connected to the anode of the second capacitor C2; the cathode of the first capacitor C1, the first diode The anode of D1, the emitter of the second insulated gate bipolar transistor Q2 and the cathode of the second capacitor C2 are all connected to the negative pole P- of the inverter bus; the anode and cathode of the second capacitor C2 are both connected to the second voltage detection circuit (Fig. In 3, the second voltage detection circuit and the power control circuit are integrated into one circuit) and the second voltage output circuit (for example, the two lines drawn from the rightmost side are connected to the second voltage output circuit).

The power control circuit may be configured to output the first drive to the gate of the first IGBT Q1 and the gate of the second IGBT Q2 respectively when the first voltage rises to the upper limit voltage value. voltage and the second driving voltage, so that the second IGBT Q2 is turned off, so that the first IGBT Q1, the first diode D1, the first inductor L1 and the second capacitor C2 form a BUCK loop; the power supply control circuit can also be configured to output to the gate of the first insulated gate bipolar transistor Q1 and the gate of the second insulated gate bipolar transistor Q2 respectively when the first voltage drops to the lower limit voltage value The third driving voltage and the fourth driving voltage are used to turn on the first insulated gate bipolar transistor Q1, and make the second insulated gate bipolar transistor Q2, the second diode D2, the first inductor L1 and the second capacitor C2 constitutes the BOOST loop.

When the BUCK-BOOST topology circuit works in the BOOST mode, the second voltage output by the first voltage output circuit often drops suddenly due to a sudden increase in the load current. In order to solve this problem, in the embodiments of the present disclosure, the above-mentioned first The voltage output circuit may also include: a first smoothing circuit; the first smoothing circuit is connected to the BUCK-BOOST topology circuit; the first smoothing circuit is configured to suppress The fluctuation of the second voltage output by the first voltage output circuit is used to avoid the sudden drop of the second voltage and stabilize it within a small fluctuation range.

Referring to Fig. 3, the circuit structure of the above-mentioned flat wave circuit as shown in the box in the figure for increasing capacity and reducing bus ripple current may include: a third insulated gate bipolar transistor Q3, a second inductor L2 and a third two Diode D3; one end of the second inductance L2 is connected to the cathode of the first diode D1, and the other end of the second inductance L2 is respectively connected to the collector of the third insulated gate bipolar transistor Q3 and the anode of the third diode D3 connection; the gate of the third insulated gate bipolar transistor Q3 is connected to the power control circuit, as shown in the figure, the BOOST drive, and the emitter is connected to the negative pole P- of the inverter bus; the cathode of the third diode D3 is connected to the second diode Cathode connection of D2.

In specific implementation, when a large current occurs in the circuit, the smoothing circuit and the parallel circuit below work alternately in the BOOST mode, which can suppress the fluctuation of the second voltage at both ends of the second capacitor C2, so as to avoid the fluctuation of the second voltage. Sudden drop, making it stable within a small fluctuation range.

The circuit control schematic diagram of the BUCK-BOOST topology circuit working in the BUCK mode is shown in Figure 4. The BUCK mode is suitable for high-voltage input ranges, and its equivalent circuit diagram is shown in Figure 5. The BUCK-BOOST topology circuit works in the BOOST mode Figure 6 shows the schematic diagram of the circuit control when the BOOST mode is applied to the low-voltage input range, and its equivalent circuit diagram is shown in Figure 7.

Referring to Fig. 8, the above-mentioned second voltage output circuit may include an H-bridge inverter circuit 121 and a full-bridge rectifier circuit 122; The rectifier circuit 122 is connected; the full-bridge rectifier circuit 122 is connected to the drive controller of the magnetic suspension bearing; the power control circuit 133 is configured to output a control signal to the H-bridge inverter circuit according to the variation of the second voltage, so that the H-bridge inverter The circuit 121 performs inverter modulation, rectifies through the full-bridge rectification circuit 122, and outputs a third voltage to the drive controller of the magnetic suspension bearing.

In a preferred embodiment, the above-mentioned second voltage output circuit may further include: a second smoothing circuit 123; the second smoothing circuit 123 is connected to the full-bridge rectifier circuit 122; the second smoothing circuit 123 is configured to suppress the full The fluctuation of the third voltage output by the bridge rectifier circuit 122.

Referring to Fig. 9, the H-bridge inverter circuit 121 may include: an H-bridge structure circuit composed of four insulated gate bipolar transistors (such as Q4, Q5, Q6, Q7), and gates of Q4, Q5, Q6, Q7 The poles are connected to the power control circuit, the collectors of Q7 and Q5 are connected to the anode of the second capacitor C2 in the BUCK-BOOST topology circuit; the emitters of Q4 and Q6 are connected to the cathode of the second capacitor C2; the full bridge rectifier circuit 122 is A bridge structure circuit composed of four diodes D11, D12, D13, D14.

The above-mentioned second smoothing circuit may include a third inductance L3 and a third capacitor C3; one end of the third inductance L3 is connected to the voltage output terminal on one side corresponding to the diode cathode in the full-bridge rectifier circuit, and the other end of the third inductance L3 is connected to the third The anode of the capacitor C3; the cathode of the third capacitor C3 is connected to the drive controller of the magnetic suspension bearing with the voltage output terminal on the side corresponding to the anode of the diode in the full-bridge rectifier circuit.

The complete circuit diagram of the power supply circuit of the magnetic suspension bearing provided by the embodiment of the present disclosure is shown in FIG. 10 , and the specific working process can be found in the foregoing content.

The power supply circuit of the magnetic suspension bearing provided by the embodiment of the present disclosure can provide a primary power supply with a buck+boost topology as a power supply to realize a wide voltage input, and add a first smoothing circuit to stabilize the primary output within a small fluctuation range. The second stage uses a full-bridge inverter and rectifier circuit as a secondary power supply. By detecting the output voltage of the first stage, it controls the full-bridge inverter and rectification process, and adds a second smoothing circuit to control the precise secondary output, so as to adapt to wide voltage Reliable power supply to the magnetic suspension bearing in the case of power supply.

Based on the above-mentioned circuit embodiments, the embodiments of the present disclosure also provide a power supply system for magnetic suspension bearings, the system includes magnetic suspension bearings and the power supply circuit for magnetic suspension bearings as described in the previously described embodiments; the input end of the power supply circuit for magnetic suspension bearings is connected to The bus bar of the frequency converter; the output end of the power supply circuit of the magnetic suspension bearing is connected to the drive controller of the magnetic suspension bearing.

The implementation principles and technical effects of the system provided by the embodiments of the present disclosure are the same as those of the foregoing circuit embodiments. For brief description, for the parts not mentioned in the system embodiments, reference may be made to the corresponding content in the foregoing circuit embodiments.

Relative steps, numerical expressions and numerical values of components and steps set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on this understanding, the essence of the technical solution of the present disclosure or the part that contributes to the related technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present disclosure. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation are therefore not to be construed as limitations on the present disclosure. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific implementations of the present disclosure, and are used to illustrate the technical solutions of the present disclosure, rather than limit them, and the protection scope of the present disclosure is not limited thereto, although referring to the aforementioned The embodiments have described the present disclosure in detail, and those skilled in the art should understand that any person familiar with the technical field can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present disclosure Changes can be easily imagined, or equivalent replacements can be made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included in this disclosure. within the scope of protection. Therefore, the protection scope of the present disclosure should be defined by the protection scope of the claims.

Industrial Applicability

The present disclosure provides a power supply circuit and system for a magnetic suspension bearing. The power supply circuit includes: a first voltage output circuit, a second voltage output circuit, and a voltage output control circuit; both the first voltage output circuit and the voltage output control circuit are connected to the busbar of a frequency converter The voltage output control circuit, the first voltage output circuit and the second voltage output circuit are connected in pairs; the second voltage output circuit is connected to the drive controller of the magnetic suspension bearing; the voltage output control circuit receives the first voltage input by the frequency converter bus, and according to The rise and fall of the first voltage controls the first voltage output circuit to switch between BUCK mode and BOOST mode, and outputs the second voltage; the voltage output control circuit also performs full-bridge inversion on the second voltage output circuit according to the rise and fall of the second voltage. , to output the third voltage to the drive controller. The disclosure can provide reliable power supply to the magnetic suspension bearing under the condition of wide voltage power supply.

In addition, it can be understood that the power supply circuit and system of the magnetic suspension bearing of the present disclosure are reproducible and can be applied in various applications. For example, the power supply circuit and system of the magnetic suspension bearing disclosed in the present disclosure can be applied to the technical field of power supply and the like.

Claims

A power supply circuit for a magnetic suspension bearing, wherein the power supply circuit includes: a first voltage output circuit based on a BUCK-BOOST topology, a second voltage output circuit based on an inverter rectification structure, and a voltage output control circuit; the first Both the voltage output circuit and the voltage output control circuit are connected to the bus bar of the frequency converter; the voltage output control circuit, the first voltage output circuit and the second voltage output circuit are connected in pairs; the second voltage output circuit is connected to A drive controller for the magnetic suspension bearing;

The voltage output control circuit is used to receive the first voltage input by the inverter bus, and control the first voltage output circuit to switch between the BUCK mode and the BOOST mode according to the rise and fall of the first voltage, so that the The first voltage output circuit outputs a second voltage whose variation range is smaller than a threshold;

The voltage output control circuit is also used to control the second voltage output circuit to perform full-bridge inversion and rectification according to the rise and fall of the second voltage, so that the second voltage output circuit sends output a third voltage.
The power supply circuit of the magnetic suspension bearing according to claim 1, wherein the voltage output control circuit comprises: a first voltage detection circuit, a second voltage detection circuit and a power control circuit; the first voltage detection circuit is connected to the The frequency converter bus is connected to the power control circuit; the second voltage detection circuit is connected to the first voltage output circuit and the power control circuit respectively; the power control circuit is connected to the first voltage output circuit and the power control circuit respectively. The second voltage output circuit is connected;

The first voltage detection circuit is used to detect the first voltage input by the inverter bus in real time, and output the first voltage to the power control circuit;

The power supply control circuit is used to control the first voltage output circuit to work in BUCK mode when the first voltage rises to an upper limit voltage value, and to control the first voltage output circuit to work in a BUCK mode when the first voltage drops to a lower limit voltage value. A voltage output circuit works in BOOST mode, so that the first voltage output circuit outputs a second voltage whose variation range is smaller than a threshold value;

The second voltage detection circuit is further configured to detect the second voltage output by the first voltage output circuit in real time, and output the second voltage to the power control circuit;

The power control circuit is also used to control the second voltage output circuit to output a third voltage according to the change of the second voltage.
The power supply circuit of the magnetic suspension bearing according to claim 2, wherein the first voltage output circuit comprises a BUCK-BOOST topology circuit; the BUCK-BOOST topology circuit comprises: a first capacitor, a second capacitor, a first an IGBT, a second IGBT, a first inductor, a first diode, and a second diode;

The anode of the first capacitor and the collector of the first IGBT are connected to the positive pole of the frequency converter bus; the gate of the first IGBT and the second insulated The gates of the gate bipolar transistors are all connected to the power control circuit; the emitters of the first insulated gate bipolar transistors are respectively connected to the cathode of the first diode and one end of the first inductor; The other end of the first inductor is respectively connected to the collector of the second IGBT and the anode of the second diode; the cathode of the second diode is connected to the anode of the second capacitor ; The cathode of the first capacitor, the anode of the first diode, the emitter of the second IGBT and the cathode of the second capacitor are all connected to the negative pole of the inverter bus; Both the anode and the cathode of the second capacitor are connected to the second voltage detection circuit and the second voltage output circuit;

The power supply control circuit is configured to respectively output to the gate of the first IGBT and the gate of the second IGBT when the first voltage rises to an upper limit voltage value The first driving voltage and the second driving voltage are used to turn off the second insulated gate bipolar transistor, to make the first insulated gate bipolar transistor, the first diode, and the first inductor forming a BUCK loop with the second capacitor;

The power supply control circuit is further configured to supply power to the gate of the first IGBT and the gate of the second IGBT respectively when the first voltage drops to a lower limit voltage value. Outputting a third driving voltage and a fourth driving voltage, so as to turn on the first IGBT, and turn on the second IGBT, the second diode, the first The inductor and the second capacitor form a BOOST loop.
The power supply circuit of the magnetic suspension bearing according to claim 3, wherein the first voltage output circuit further comprises a first smoothing circuit; the first smoothing circuit is connected to the BUCK-BOOST topology circuit;

The first smoothing circuit is used for suppressing the fluctuation of the second voltage output by the first voltage output circuit when the BUCK-BOOST topology circuit works in BOOST mode.
The power supply circuit of the magnetic suspension bearing according to claim 4, wherein the first smoothing circuit comprises a third insulated gate bipolar transistor, a second inductor and a third diode;

One end of the second inductance is connected to the cathode of the first diode, and the other end of the second inductance is respectively connected to the collector of the third IGBT and the cathode of the third diode. anode connection; the gate of the third insulated gate bipolar transistor is connected to the power control circuit, and the emitter of the third insulated gate bipolar transistor is connected to the negative pole of the inverter bus; the third two The cathode of the pole tube is connected with the cathode of the second diode.
The power supply circuit for a magnetic suspension bearing according to any one of claims 3 to 5, wherein the second voltage output circuit includes an H-bridge inverter circuit and a full-bridge rectifier circuit;

The H-bridge inverter circuit is respectively connected to the BUCK-BOOST topology circuit, the power control circuit, and the full-bridge rectifier circuit; the full-bridge rectifier circuit is connected to the drive controller of the magnetic suspension bearing;

The power supply control circuit is configured to output a control signal to the H-bridge inverter circuit according to the variation of the second voltage, so that the H-bridge inverter circuit performs inverter modulation, and through the full The bridge rectification circuit performs rectification and outputs a third voltage to the drive controller of the magnetic suspension bearing.
The power supply circuit of the magnetic suspension bearing according to claim 6, wherein the second voltage output circuit further includes a second smoothing circuit; the second smoothing circuit is connected to the full-bridge rectifier circuit;

The second smoothing circuit is configured to suppress fluctuations of the third voltage output by the full-bridge rectification circuit.
The power supply circuit of the magnetic suspension bearing according to claim 6 or 7, wherein, the H-bridge inverter circuit includes an H-bridge structure circuit composed of four insulated gate bipolar transistors; the full-bridge rectifier circuit is composed of A bridge structure circuit composed of four diodes.
The power supply circuit of the magnetic suspension bearing according to claim 7, wherein the second smoothing circuit comprises a third inductor and a third capacitor;

One end of the third inductance is connected to the voltage output terminal on one side corresponding to the cathode of the diode in the full-bridge rectifier circuit, and the other end of the third inductance is connected to the anode of the third capacitor; the cathode of the third capacitor and The voltage output terminal on one side corresponding to the anode of the diode in the full-bridge rectifier circuit is connected to the drive controller of the magnetic suspension bearing.
The power supply circuit for a magnetic suspension bearing according to any one of claims 2 to 9, wherein the difference between the upper limit voltage value and the lower limit voltage value is greater than a preset threshold.
A power supply system of a magnetic suspension bearing, wherein the power supply system of the magnetic suspension bearing comprises a magnetic suspension bearing and a power supply circuit of the magnetic suspension bearing according to any one of claims 1-10; the input of the power supply circuit of the magnetic suspension bearing The end is connected to the bus bar of the frequency converter; the output end of the power supply circuit of the magnetic suspension bearing is connected to the drive controller of the magnetic suspension bearing.