Two-way magnetic suspension bearing power amplifier topology circuit based on bridge circuit

Abstract

The utility model discloses a two-way magnetic suspension bearing power amplifier topology circuit based on a bridge circuit. The two-way magnetic suspension bearing power amplifier topology circuit comprises an input sub-circuit; the bridge type power conversion unit comprises a first MOS (Metal Oxide Semiconductor) tube Q1, a second MOS tube Q2, a third MOS tube Q3, a first diode D1, a second diode D2 and a third diode D3; a first pin of the first diode D1 is electrically connected with a second pin of the third MOS tube Q3 to form a negative output end Iout-, and a second pin of the second diode D2 is electrically connected with a third pin of the first MOS tube Q1 to form a first positive output end Iout 1 +; the first pin of the third diode D3 is electrically connected with the input sub-circuit, and the second pin of the third diode D3 is electrically connected with the third pin of the second MOS tube Q2 to form a second positive output end Iout 2 +; the first positive output end Iout 1 + and the negative output end Iout-are matched to form a first output loop, and the second positive output end Iout 2 + and the negative output end Iout-are matched to form a second output loop. According to the utility model, fewer components are used, the structure is simpler, the size of the assembly is small, the design cost and the material cost are low, and the device is suitable for batch production and use.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic suspension bearings, in particular to a double-path magnetic suspension bearing power amplifier topology circuit based on a bridge circuit. Background Art

[0002] A magnetic levitation motor (also known as a magnetic bearing motor) differs significantly from conventional motors in that it utilizes magnetic bearings, replacing the ball bearings or floating bearings used in conventional motors. During operation, the rotor and stator of a magnetic levitation motor do not slide relative to each other, reducing power loss due to sliding friction. Maintenance also eliminates the need for lubrication and maintenance of moving surfaces. The key to a magnetic levitation motor's stable and reliable operation lies in its ability to maintain stable levitation. Therefore, generating a stable and dynamically responsive Ampere force in the magnetic induction coil via the levitation current is crucial for maintaining stable levitation of the magnetic bearing. Maintaining stable levitation requires multiple Ampere forces of varying magnitudes, i.e., levitation currents of varying magnitudes. The most commonly used structure in existing magnetic levitation bearing control circuits is a bridge rectifier topology, which achieves the desired levitation currents by controlling the MOS transistors within the bridge rectifier circuit. However, this control circuit requires four MOS transistors to form a bridge rectifier circuit and can only control a single levitation current. If multiple levitation currents are required, multiple bridge rectifier circuits are required, resulting in a complex structure and increased design and material costs, as well as component size. Utility Model Content

[0003] In order to address the deficiencies in the prior art, the utility model provides a dual-path magnetic levitation bearing power amplifier topology circuit based on a bridge circuit, which uses fewer components, has a simpler structure, and has a small component size, low design cost and material cost, and is suitable for mass production.

[0004] In order to achieve the above purpose, the specific solution adopted by the utility model is:

[0005] A dual-path magnetic suspension bearing power amplifier topology circuit based on a bridge circuit, comprising:

[0006] Input subcircuit;

[0007] A bridge power conversion unit includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a first diode D1, a second diode D2 and a third diode D3;

[0008] The first pin of the first MOS transistor Q1 is used to receive the driving signal G1, and the second pin of the first MOS transistor Q1 is electrically connected to the input sub-circuit;

[0009] The first pin of the second MOS transistor Q2 is used to receive the driving signal G2, and the second pin of the second MOS transistor Q2 is electrically connected to the input sub-circuit;

[0010] The first pin of the third MOS transistor Q3 is used to receive the driving signal G3, and the third pin of the third MOS transistor Q3 is electrically connected to the input sub-circuit;

[0011] The first pin of the first diode D1 is electrically connected to the second pin of the third MOS transistor Q3 to form a negative output terminal Iout-, and the second pin of the first diode D1 is electrically connected to the input sub-circuit;

[0012] A first pin of the second diode D2 is electrically connected to the input sub-circuit, and a second pin of the second diode D2 is electrically connected to a third pin of the first MOS transistor Q1 to form a first positive output terminal Iout1+;

[0013] A first pin of the third diode D3 is electrically connected to the input sub-circuit, and a second pin of the third diode D3 is electrically connected to a third pin of the second MOS transistor Q2 to form a second positive output terminal Iout2+;

[0014] The first positive output terminal Iout1+ and the negative output terminal Iout− cooperate to form a first output loop, and the second positive output terminal Iout2+ and the negative output terminal Iout− cooperate to form a second output loop.

[0015] As a further optimization of the above-mentioned dual-path magnetic levitation bearing power amplifier topology circuit based on a bridge circuit: the input subcircuit includes a first capacitor CE1, a first pin of the first capacitor CE1 is electrically connected to the voltage input terminal VIN+, a second pin of the first capacitor CE1 is electrically connected to the ground terminal GND, a second pin of the first MOS tube Q1 is electrically connected to the first pin of the first capacitor CE1, a second pin of the second MOS tube Q2 is electrically connected to the first pin of the first capacitor CE1, and a third pin of the third MOS tube Q3 is electrically connected to the second pin of the first capacitor CE1.

[0016] As a further optimization of the above-mentioned dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit: the capacitance of the first capacitor CE1 is 150Uf / 200V.

[0017] As a further optimization of the above-mentioned dual-path magnetic suspension bearing power amplifier topology circuit based on a bridge circuit: it also includes a first current transformer CT1 and a second current transformer CT2;

[0018] The first current transformer CT1 is used to collect the output current of the first output circuit. The first, second, and third pins of the first current transformer CT1 are electrically connected to the third pin of the first MOS transistor Q1. The seventh and eighth pins of the first current transformer CT1 are connected to the first auxiliary power supply. The ninth pin of the first current transformer CT1 is used to output the first current signal IL1. The second current transformer CT2 is used to collect the output current of the second output circuit. The first, second, and third pins of the second current transformer CT2 are electrically connected to the third pin of the second MOS transistor Q2. The seventh and eighth pins of the second current transformer CT2 are connected to the second auxiliary power supply. The ninth pin of the second current transformer CT2 is used to output the second current signal IL2.

[0019] As a further optimization of the above-mentioned dual-path magnetic levitation bearing power amplifier topology circuit based on a bridge circuit: it also includes a first inductor L1 and a second inductor L2, the first pin of the first inductor L1 is electrically connected to the fourth pin, fifth pin and sixth pin of the first current transformer CT1 and the first positive output terminal Iout1+, the second pin of the first inductor L1 is electrically connected to the negative output terminal Iout-, the first pin of the second inductor L2 is electrically connected to the fourth pin, fifth pin and sixth pin of the second current transformer CT2 and the second positive output terminal Iout2+, and the second pin of the second inductor L2 is electrically connected to the negative output terminal Iout-.

[0020] As a further optimization of the above-mentioned dual-path magnetic levitation bearing power amplifier topology circuit based on a bridge circuit: it also includes a control unit for receiving the first current signal IL1 and the second current signal IL2, and outputting the drive signal G1, the drive signal G2 and the drive signal G3.

[0021] As a further optimization of the above-mentioned dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit: the first current transformer CT1 and the second current transformer CT2 are both of model LAH25-NP.

[0022] As a further optimization of the above-mentioned dual-path magnetic levitation bearing power amplifier topology circuit based on a bridge circuit: the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the first diode D1, the second diode D2 and the third diode D3 are all of model SS15S92F6-AG.

[0023] The utility model adopts two cross networks to realize the output of two suspension currents. Compared with the traditional method of using two bridge circuits including four devices to separately control the suspension current output, the utility model uses fewer components, has a simpler structure, and has a small component size, low design cost and material cost, which is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a circuit principle diagram of the utility model;

[0025] Figure 2 This is a waveform test result diagram of the present utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1 and 2 A dual-path magnetic levitation bearing power amplifier topology circuit based on a bridge circuit includes an input subcircuit and a bridge power conversion unit.

[0028] The input sub-circuit is configured to receive input current and includes a first capacitor CE1 , wherein a first pin of the first capacitor CE1 is electrically connected to the voltage input terminal VIN+, and a second pin of the first capacitor CE1 is electrically connected to the ground terminal GND.

[0029] The bridge power conversion unit includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a first diode D1, a second diode D2 and a third diode D3.

[0030] The first pin of the first MOS transistor Q1 is used to receive the driving signal G1, and the second pin of the first MOS transistor Q1 is electrically connected to the input sub-circuit and the first pin of the first capacitor CE1.

[0031] The first pin of the second MOS transistor Q2 is used to receive the drive signal G2, and the second pin of the second MOS transistor Q2 is electrically connected to the input sub-circuit. The second pin of the second MOS transistor Q2 is also electrically connected to the first pin of the first capacitor CE1.

[0032] The first pin of the third MOS transistor Q3 is used to receive the driving signal G3, and the third pin of the third MOS transistor Q3 is electrically connected to the input sub-circuit and the second pin of the first capacitor CE1.

[0033] The first pin of the first diode D1 is electrically connected to the second pin of the third MOS transistor Q3 to form a negative output terminal Iout-, and the second pin of the first diode D1 is electrically connected to the input sub-circuit.

[0034] A first pin of the second diode D2 is electrically connected to the input sub-circuit, and a second pin of the second diode D2 is electrically connected to a third pin of the first MOS transistor Q1 to form a first positive output terminal Iout1+.

[0035] A first pin of the third diode D3 is electrically connected to the input sub-circuit, and a second pin of the third diode D3 is electrically connected to a third pin of the second MOS transistor Q2 to form a second positive output terminal Iout2+.

[0036] The first positive output terminal Iout1+ and the negative output terminal Iout− cooperate to form a first output loop, and the second positive output terminal Iout2+ and the negative output terminal Iout− cooperate to form a second output loop.

[0037] During use, when the voltage input terminal VIN+ is normally powered, the drive signal G1 and the drive signal G3 are used to control the first MOS transistor Q1, the first diode D1, the second diode D2, and the third MOS transistor Q3 to form a first network, and the first output loop is used to complete the floating current output; or the drive signal G2 and the drive signal G3 are used to control the second MOS transistor Q2, the third MOS transistor Q3, the first diode D1, and the third diode D3 to form a second network, and the second output loop is used to complete the floating current output.

[0038] The utility model adopts two cross networks to realize the output of two suspension currents. Compared with the traditional method of using two bridge circuits including four devices to separately control the suspension current output, the utility model uses fewer components, has a simpler structure, and has a small component size, low design cost and material cost, which is suitable for mass production.

[0039] In order to protect the bridge power conversion unit, the topology circuit of the present invention further includes a first current transformer CT1 , a second current transformer CT2 , a first inductor L1 , and a second inductor L2 .

[0040] The first current transformer CT1 is used to collect the output current of the first output circuit. The first, second, and third pins of the first current transformer CT1 are electrically connected to the third pin of the first MOS transistor Q1. The seventh and eighth pins of the first current transformer CT1 are used to connect to the first auxiliary power supply. The ninth pin of the first current transformer CT1 is used to output the first current signal IL1.

[0041] The second current transformer CT2 is used to collect the output current of the second output loop. The first, second, and third pins of the second current transformer CT2 are electrically connected to the third pin of the second MOS transistor Q2. The seventh and eighth pins of the second current transformer CT2 are used to connect to the second auxiliary power supply. The ninth pin of the second current transformer CT2 is used to output the second current signal IL2.

[0042] The first pin of the first inductor L1 is electrically connected to the fourth, fifth and sixth pins of the first current transformer CT1 and the first positive output terminal Iout1+, the second pin of the first inductor L1 is electrically connected to the negative output terminal Iout-, the first pin of the second inductor L2 is electrically connected to the fourth, fifth and sixth pins of the second current transformer CT2 and the second positive output terminal Iout2+, and the second pin of the second inductor L2 is electrically connected to the negative output terminal Iout-.

[0043] The first current transformer CT1, the second current transformer CT2, the first inductor L1, and the second inductor L2 form a current acquisition network that can collect dual-path suspension currents. When the suspension current or input current is abnormal, the drive signals G1, G2, and G3 can be immediately shut down to implement overcurrent protection and protect the device from damage.

[0044] Furthermore, the topology circuit includes a control unit for receiving a first current signal IL1 and a second current signal IL2, and outputting drive signals G1, G2, and G3. The control unit detects the magnitude of the first suspension current in real time by acquiring the first current signal IL1, and detects the magnitude of the second suspension current in real time by acquiring the second current signal IL2, thereby achieving closed-loop control of the two suspension currents. Furthermore, the duty cycle of the drive signals G1 and G3 can be adjusted to ensure stable and adjustable output suspension currents. The specific structure of the control unit is conventional in the art and will not be further described here.

[0045] Finally, in this embodiment, the first current transformer CT1 and the second current transformer CT2 are both LAH25-NP; the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, the first diode D1, the second diode D2, and the third diode D3 are all SS15S92F6-AG; and the capacitance of the first capacitor CE1 is 150 μF / 200 V. In other embodiments of the present invention, the component models and parameters can be flexibly selected according to actual needs.

[0046] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit, characterized in that: include: Input subcircuit; A bridge power conversion unit includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a first diode D1, a second diode D2 and a third diode D3; The first pin of the first MOS transistor Q1 is used to receive the driving signal G1, and the second pin of the first MOS transistor Q1 is electrically connected to the input sub-circuit; The first pin of the second MOS transistor Q2 is used to receive the driving signal G2, and the second pin of the second MOS transistor Q2 is electrically connected to the input sub-circuit; The first pin of the third MOS transistor Q3 is used to receive the driving signal G3, and the third pin of the third MOS transistor Q3 is electrically connected to the input sub-circuit; The first pin of the first diode D1 is electrically connected to the second pin of the third MOS transistor Q3 to form a negative output terminal Iout-, and the second pin of the first diode D1 is electrically connected to the input sub-circuit; A first pin of the second diode D2 is electrically connected to the input sub-circuit, and a second pin of the second diode D2 is electrically connected to a third pin of the first MOS transistor Q1 to form a first positive output terminal Iout1+; A first pin of the third diode D3 is electrically connected to the input sub-circuit, and a second pin of the third diode D3 is electrically connected to a third pin of the second MOS transistor Q2 to form a second positive output terminal Iout2+; The first positive output terminal Iout1+ and the negative output terminal Iout− cooperate to form a first output loop, and the second positive output terminal Iout2+ and the negative output terminal Iout− cooperate to form a second output loop.

2. A dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit as claimed in claim 1, characterized in that: The input subcircuit includes a first capacitor CE1, a first pin of the first capacitor CE1 is electrically connected to the voltage input terminal VIN+, a second pin of the first capacitor CE1 is electrically connected to the ground terminal GND, a second pin of the first MOS transistor Q1 is electrically connected to the first pin of the first capacitor CE1, a second pin of the second MOS transistor Q2 is electrically connected to the first pin of the first capacitor CE1, and a third pin of the third MOS transistor Q3 is electrically connected to the second pin of the first capacitor CE1.

3. The dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit as claimed in claim 2, characterized in that: The capacitance of the first capacitor CE1 is 150Uf / 200V.

4. The dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit according to claim 1, characterized in that: Also includes a first current transformer CT1 and a second current transformer CT2; The first current transformer CT1 is used to collect the output current of the first output circuit. The first, second, and third pins of the first current transformer CT1 are electrically connected to the third pin of the first MOS transistor Q1. The seventh and eighth pins of the first current transformer CT1 are used to connect to the first auxiliary power supply. The ninth pin of the first current transformer CT1 is used to output a first current signal IL1. The second current transformer CT2 is used to collect the output current of the second output loop. The first, second, and third pins of the second current transformer CT2 are electrically connected to the third pin of the second MOS transistor Q2. The seventh and eighth pins of the second current transformer CT2 are used to connect to the second auxiliary power supply. The ninth pin of the second current transformer CT2 is used to output the second current signal IL2.

5. The dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit as claimed in claim 4, characterized in that: It also includes a first inductor L1 and a second inductor L2, the first pin of the first inductor L1 is electrically connected to the fourth pin, fifth pin and sixth pin of the first current transformer CT1 and the first positive output terminal Iout1+, the second pin of the first inductor L1 is electrically connected to the negative output terminal Iout-, the first pin of the second inductor L2 is electrically connected to the fourth pin, fifth pin and sixth pin of the second current transformer CT2 and the second positive output terminal Iout2+, and the second pin of the second inductor L2 is electrically connected to the negative output terminal Iout-.

6. The dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit according to claim 4, characterized in that: The system further includes a control unit configured to receive the first current signal IL1 and the second current signal IL2 , and output the drive signal G1 , the drive signal G2 , and the drive signal G3 .

7. The dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit according to claim 4, characterized in that: The models of the first current transformer CT1 and the second current transformer CT2 are both LAH25-NP.

8. The dual-path magnetic bearing power amplifier topology circuit based on a bridge circuit according to claim 1, characterized in that: The first MOS transistor Q1 , the second MOS transistor Q2 , the third MOS transistor Q3 , the first diode D1 , the second diode D2 , and the third diode D3 are all of model SS15S92F6-AG.

Images