Control circuit of double-path magnetic suspension bearing bridge type power amplifier
By introducing signal conversion, error signal amplification, and square wave signal generation modules into the magnetic levitation bearing control circuit, the problems of complex traditional circuit structure and insufficient control precision are solved, and precise control of MOSFET and accurate output current are achieved.
Patent Information
- Application Number
- CN202423179984.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Traditional magnetic levitation bearing control circuits are complex in structure, have a large number of components, are costly and bulky when they have multiple outputs, and their control accuracy is greatly affected by the errors of the circuit components.
The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier includes a signal conversion module, an error signal amplification module, a square wave comparison module, and a drive module. The control accuracy of the MOSFET is improved by current sampling, error signal comparison, and square wave signal generation.
It achieves precise control of the dual-bridge circuit, improves the control accuracy of the MOSFET, and ensures the accuracy of the output current.
Smart Images
Figure CN223666319U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of magnetic levitation bearing control technology, specifically a control circuit for a dual-channel magnetic levitation bearing bridge power amplifier. Background Technology
[0002] With the continuous development of magnetic levitation control technology, magnetic levitation technology has been widely applied in the field of magnetic bearings. Generating a stable and dynamically responsive Ampere force through levitation current in the magnetic induction coil is a key factor in maintaining the stable levitation of a magnetic bearing. To maintain the stable levitation of a magnetic bearing, multiple Ampere forces of different magnitudes, i.e., levitation currents of different magnitudes, are required.
[0003] Traditional magnetic levitation bearing control circuits use a bridge rectifier topology, where one bridge circuit controls one output circuit. When multiple outputs are required, multiple bridge circuits and control circuits are needed, resulting in a relatively complex circuit structure, a large number of components, relatively high cost, and large component size. To address this issue, the applicant, in patent application number "202422274422X", uses two intersecting networks to achieve two-way levitation current output. Compared to the traditional method of using two bridge circuits with four components each to control the levitation current output, this method uses fewer components, has a simpler structure, and results in smaller component size, lower design and material costs, making it suitable for mass production. However, in practical applications, this solution relies entirely on theoretical values to control the circuit components, making it susceptible to errors in the components themselves, leading to significant errors when controlling the MOSFETs in the circuit. Utility Model Content
[0004] To address the problems of existing technologies that require multiple bridge circuits for multi-output circuits, resulting in relatively complex circuit structures, a large number of components, relatively high costs, and large component sizes, this invention provides a control circuit for a dual-channel magnetic levitation bearing bridge power amplifier, which improves the control accuracy of the MOS transistors in the circuit.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a control circuit for a dual-channel magnetic levitation bearing bridge power amplifier, comprising:
[0006] Two signal conversion modules are provided. One signal conversion module is connected between the first positive output terminal Iout+ and the negative output terminal Iout- of the bridge power amplifier, and the other signal conversion module is connected between the second positive output terminal Iout+ and the negative output terminal Iout- of the bridge power amplifier. The signal conversion module includes a current sampling unit for acquiring current signals.
[0007] An error signal amplification module is connected to a signal conversion module. The error signal amplification module is used to compare the current signal with an existing given signal to generate an error signal.
[0008] The square wave comparison module is connected to the error signal comparison module. The square wave comparison module is used to compare the error signal with the existing triangular wave signal to generate a square wave signal.
[0009] The driver module is used to generate a drive signal based on the square wave signal, and the drive signal is used to drive the MOS transistors in the bridge power amplifier.
[0010] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the current sampling unit includes a first sampling resistor, a second sampling resistor, a third sampling resistor, a fourth sampling resistor, a fifth sampling resistor, a first sampling capacitor, and a second sampling capacitor. The first pin of the first sampling resistor is connected to either the first positive output terminal Iout+ or the second positive output terminal Iout+. The second pin of the first sampling resistor is connected to the first pin of the first sampling capacitor. The first pin of the second sampling resistor is connected to the first pin of the first sampling resistor. The first pin of the third sampling resistor is connected to the first pin of the fourth sampling resistor. The second pin of the fourth sampling resistor is connected to the first pin of the fifth sampling resistor. The first pin of the second sampling capacitor is connected to the second pin of the third sampling resistor.
[0011] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier of the utility model: the error signal amplification module includes a first error amplification resistor, a second error amplification resistor, a third error amplification resistor, a fourth error amplification resistor, a fifth error amplification resistor, a sixth error amplification resistor, a seventh error amplification resistor, a first error comparison capacitor, and a second error comparison capacitor. The first pin of the first error amplification resistor is connected to the signal conversion module. The second pin of the first error amplification resistor is connected to the first pin of the fifth error amplification resistor and the first pin of the first error comparison capacitor. The first pin of the second error amplification resistor forms an input terminal for receiving the given signal. The second pin of the second error amplification resistor is connected to the first pin of the third error amplification resistor. The first pin of the fourth error amplification resistor is connected to the second pin of the fifth error amplification resistor and the second pin of the sixth error amplification resistor. The second pin of the fourth error amplification resistor is connected to the first pin of the seventh error amplification resistor and the first pin of the second error comparison capacitor.
[0012] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the square wave comparison module includes a first square wave comparison resistor, a second square wave comparison resistor, a third square wave comparison resistor, and a fourth square wave comparison resistor. The first pin of the first square wave comparison resistor is connected to the error signal amplification module. The first pin of the second square wave comparison resistor forms an input terminal for receiving the triangular wave signal. The first pin of the third square wave comparison resistor and the second pin of the fourth square wave comparison resistor are connected.
[0013] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the driving module has a first driving resistor and a second driving resistor. The first pin of the first driving resistor forms an input terminal for receiving the square wave signal, and the second pin of the second driving resistor is connected to the gate of the MOS transistor of the bridge power amplifier.
[0014] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the control circuit includes a current signal operational amplifier, which is used to amplify the current signal.
[0015] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the control circuit includes an error operational amplifier, which is used to amplify the error signal.
[0016] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the control circuit includes a square wave logic operation circuit, which is used to perform logical conversion on the square wave signal.
[0017] As a further optimization of the control circuit of a dual-channel magnetic levitation bearing bridge power amplifier, the control circuit includes a drive amplifier for amplifying the drive signal.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] This invention employs two signal conversion modules. One module is connected between the first positive output terminal Iout+ and the negative output terminal Iout- of a bridge power amplifier, while the other module is connected between the second positive output terminal Iout+ and the second negative output terminal Iout-. Each signal conversion module includes a current sampling unit for acquiring current signals; an error signal amplification module connected to the signal conversion module, used to compare the current signal with an existing given signal to generate an error signal; a square wave comparison module connected to the error signal comparison module, used to compare the error signal with an existing triangular wave signal to generate a square wave signal; and a driving module for generating a driving signal based on the square wave signal. This driving signal drives the MOSFETs in the bridge power amplifier. This invention implements control logic for a dual-bridge circuit, improves the control accuracy of the MOSFETs, and achieves precise control of the output current. Attached Figure Description
[0020] Figure 1 This is the circuit diagram of the signal conversion module of this utility model;
[0021] Figure 2 This is the circuit diagram of the error signal amplification module of this utility model;
[0022] Figure 3 This is the circuit diagram of the square wave comparison module of this utility model;
[0023] Figure 4 This is the circuit diagram of the driving module of this utility model;
[0024] Figure 5 This is the circuit schematic diagram of this utility model;
[0025] Figure 6 This is the first test waveform diagram of this utility model;
[0026] Figure 7 This is the second test waveform diagram of this utility model. Detailed Implementation
[0027] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art.
[0028] A control circuit for a dual-channel magnetic levitation bearing bridge power amplifier, such as Figures 1-7As shown, the system includes two signal conversion modules. One module is connected between the first positive output terminal Iout+ and the negative output terminal Iout- of the bridge power amplifier, and the other module is connected between the second positive output terminal Iout+ and the second negative output terminal Iout- of the bridge power amplifier. Each signal conversion module includes a current sampling unit for acquiring current signals. The current signal obtained by the first current sampling unit is represented by IF1 in the figure, and the current signal obtained by the second current sampling unit is represented by IF2. The control circuit includes a current signal operational amplifier for amplifying the current signals. The current signal operational amplifier can amplify the current signals acquired by the two signal conversion modules, and is represented by U1 in the figure.
[0029] like Figure 1 As shown, the current sampling unit includes a first sampling resistor, a second sampling resistor, a third sampling resistor, a fourth sampling resistor, a fifth sampling resistor, a first sampling capacitor, and a second sampling capacitor. The first pin of the first sampling resistor is connected to either the first positive output terminal Iout+ or the second positive output terminal Iout+. The second pin of the first sampling resistor is connected to the first pin of the first sampling capacitor. The first pin of the second sampling resistor is connected to the first pin of the first sampling resistor. The first pin of the third sampling resistor is connected to the first pin of the fourth sampling resistor. The second pin of the fourth sampling resistor is connected to the first pin of the fifth sampling resistor. The first pin of the second sampling capacitor is connected to the second pin of the third sampling resistor. The third sampling resistor and the second sampling capacitor form the output terminal of the current signal. In the first current sampling unit, the first sampling resistor is represented by resistor R23, the second sampling resistor by resistor R25, the third sampling resistor by resistor R1, the fourth sampling resistor by resistor R5, and the fifth sampling resistor by resistor R4. The first sampling capacitor is represented by capacitor C4, and the second sampling capacitor is represented by capacitor C2. In the second current sampling unit, the first sampling resistor is represented by resistor R24, the second sampling resistor by resistor R26, the third sampling resistor by resistor R6, the fourth sampling resistor by resistor R11, and the fifth sampling resistor by resistor R12. The first sampling capacitor is represented by capacitor C6, and the second sampling capacitor is represented by capacitor C3. The first current sampling unit also includes capacitor C5, which is connected to the current signal operational amplifier. The second current sampling unit also includes capacitor C1, which is connected to the current signal operational amplifier.
[0030] Error signal amplification module, such as Figure 2As shown, the error signal amplification module is connected to the signal conversion module. The error signal amplification module is used to compare the current signal with an existing given signal to generate an error signal. How the existing given signal is generated is conventional prior art and will not be elaborated further here. The given signal input to the first error signal amplification module is represented by IG1 in the figure, and the error signal is represented by EO1. The given signal input to the second error signal amplification module is represented by IG2 in the figure, and the error signal is represented by EO2. The control circuit includes an error operational amplifier, which is used to amplify the error signal. The error operational amplifier can amplify the error signals from both error signal amplification modules, and is represented by U5 in the figure.
[0031] The error signal amplification module includes a first error amplification resistor, a second error amplification resistor, a third error amplification resistor, a fourth error amplification resistor, a fifth error amplification resistor, a sixth error amplification resistor, a seventh error amplification resistor, a first error comparison capacitor, and a second error comparison capacitor. The first pin of the first error amplification resistor is connected to the signal conversion module. The second pin of the first error amplification resistor is connected to the first pins of both the fifth and first error amplification resistors. The first pin of the second error amplification resistor forms an input terminal for receiving the given signal. The second pin of the second error amplification resistor is connected to the first pin of the third error amplification resistor. The first pin of the fourth error amplification resistor is connected to the second pins of both the fifth and sixth error amplification resistors. The second pin of the fourth error amplification resistor is also connected to the first pins of both the seventh and second error amplification resistors. The output terminal for the error signal is formed between the fourth and seventh error amplification resistors. Figure 2 As shown, in the first error signal amplification module, the first error amplification resistor is represented by resistor R42, the second error amplification resistor by resistor R45, the third error amplification resistor by resistor R51, the fourth error amplification resistor by resistor R28, the fifth error amplification resistor by resistor R29, the sixth error amplification resistor by resistor R33, and the seventh error amplification resistor by resistor R32. The first error comparison capacitor is represented by capacitor C15, and the second error comparison capacitor is represented by capacitor C13. The first error signal amplification module also includes capacitor C17, which is connected to the error operational amplifier; the second error signal amplification module also includes capacitor C11, which is connected to the error operational amplifier.
[0032] Square wave comparison module, such as Figure 3As shown, the square wave comparison module is connected to the error signal comparison module. The square wave comparison module is used to compare the error signal with an existing triangular wave signal to generate a square wave signal. How the existing triangular wave signal is generated is conventional prior art in this field and will not be described in detail here. The control circuit includes a square wave logic operation circuit, which is used to perform logical conversion on the square wave signal. There are two square wave logic operation circuits; in the figure, the first square wave logic operation circuit is represented by U2, and the second square wave logic operation circuit is represented by U3.
[0033] The square wave comparison module includes a first square wave comparison resistor, a second square wave comparison resistor, a third square wave comparison resistor, and a fourth square wave comparison resistor. The first pin of the first square wave comparison resistor is connected to the error signal amplification module. The first pin of the second square wave comparison resistor forms an input terminal for receiving the triangular wave signal. The first pins of the third and fourth square wave comparison resistors are connected. Figure 3 As shown, error signal EO1 is input to the first square wave logic circuit in two ways, and error signal EO2 is input to the second square wave logic circuit in two ways. The first triangular wave signal is represented by TR1 in the figure, and the second triangular wave signal is represented by TR2. The first triangular wave signal is input to both the first and second square wave logic circuits, and the second triangular wave signal is input to both the first and second square wave logic circuits. The specific combinations are: EO1 and TR1, EO1 and TR2, EO2 and TR1, and EO2 and TR2. The square wave signal DRV1 generated by comparing EO1 and TR1 is amplified by the first square wave logic circuit. The square wave signal DRV31 generated by comparing EO1 and TR2 is amplified by the first square wave logic circuit. The square wave signal DRV2 generated by comparing EO2 and TR1 is amplified by the second square wave logic circuit. The square wave signal DRV32 generated by comparing EO2 and TR2 is amplified by the second square wave logic circuit.
[0034] Driver modules, such as Figure 4 As shown, a drive signal is generated based on a square wave signal, which drives the MOSFETs in the bridge power amplifier. The drive module includes a first drive resistor and a second drive resistor. The first pin of the first drive resistor forms an input terminal for receiving the square wave signal, and the second pin of the second drive resistor is connected to the gate of the MOSFET in the bridge power amplifier. The control circuit includes a drive amplifier, which amplifies the drive signal, improving the control accuracy of the MOSFETs.
[0035] like Figure 5As shown, the MOSFETs of the bridge power amplifier are represented by the first MOSFET Q1, the second MOSFET Q2, and the third MOSFET Q3. The drive signals are represented by G1, G2, and G3 in the figure. The second drive resistors form the output terminals of the drive signals. The second drive resistors are represented by resistors R37, R39, and R40 in the figure. Resistor R37 forms the output terminal of drive signal G1, resistor R39 forms the output terminal of drive signal G2, and resistor R40 forms the output terminal of drive signal G3. The second pin of resistor R37 is connected to the gate of the first MOSFET Q1, the second pin of resistor R39 is connected to the gate of the second MOSFET Q2, and the second pin of resistor R40 is connected to the gate of the third MOSFET Q3.
[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those 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 to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A control circuit for a dual-channel magnetic levitation bearing bridge power amplifier, characterized in that, include: Two signal conversion modules are provided. One signal conversion module is connected between the first positive output terminal Iout+ and the negative output terminal Iout- of the bridge power amplifier, and the other signal conversion module is connected between the second positive output terminal Iout+ and the negative output terminal Iout- of the bridge power amplifier. The signal conversion module includes a current sampling unit for acquiring current signals. An error signal amplification module is connected to a signal conversion module. The error signal amplification module is used to compare the current signal with an existing given signal to generate an error signal. The square wave comparison module is connected to the error signal comparison module. The square wave comparison module is used to compare the error signal with the existing triangular wave signal to generate a square wave signal. The driver module is used to generate a drive signal based on the square wave signal, and the drive signal is used to drive the MOS transistors in the bridge power amplifier.
2. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The current sampling unit includes a first sampling resistor, a second sampling resistor, a third sampling resistor, a fourth sampling resistor, a fifth sampling resistor, a first sampling capacitor, and a second sampling capacitor. The first pin of the first sampling resistor is connected to either the first positive output terminal Iout+ or the second positive output terminal Iout+. The second pin of the first sampling resistor is connected to the first pin of the first sampling capacitor. The first pin of the second sampling resistor is connected to the first pin of the first sampling resistor. The first pin of the third sampling resistor is connected to the first pin of the fourth sampling resistor. The second pin of the fourth sampling resistor is connected to the first pin of the fifth sampling resistor. The first pin of the second sampling capacitor is connected to the second pin of the third sampling resistor.
3. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The error signal amplification module includes a first error amplification resistor, a second error amplification resistor, a third error amplification resistor, a fourth error amplification resistor, a fifth error amplification resistor, a sixth error amplification resistor, a seventh error amplification resistor, a first error comparison capacitor, and a second error comparison capacitor. The first pin of the first error amplification resistor is connected to the signal conversion module. The second pin of the first error amplification resistor is connected to the first pin of the fifth error amplification resistor and the first pin of the first error comparison capacitor. The first pin of the second error amplification resistor forms an input terminal for receiving the given signal. The second pin of the second error amplification resistor is connected to the first pin of the third error amplification resistor. The first pin of the fourth error amplification resistor is connected to the second pins of the fifth and sixth error amplification resistors. The second pin of the fourth error amplification resistor is connected to the first pin of the seventh error amplification resistor and the first pin of the second error comparison capacitor.
4. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The square wave comparison module includes a first square wave comparison resistor, a second square wave comparison resistor, a third square wave comparison resistor, and a fourth square wave comparison resistor. The first pin of the first square wave comparison resistor is connected to the error signal amplification module. The first pin of the second square wave comparison resistor forms an input terminal for receiving the triangular wave signal. The first pin of the third square wave comparison resistor and the second pin of the fourth square wave comparison resistor are connected.
5. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The driving module has a first driving resistor and a second driving resistor. The first pin of the first driving resistor forms an input terminal for receiving the square wave signal, and the second pin of the second driving resistor is connected to the gate of the MOS transistor of the bridge power amplifier.
6. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The control circuit includes a current signal operational amplifier, which is used to amplify the current signal.
7. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The control circuit includes an error operational amplifier, which is used to amplify the error signal.
8. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The control circuit includes a square wave logic operation circuit, which is used to perform logical conversion on the square wave signal.
9. The control circuit of the dual-channel magnetic levitation bearing bridge power amplifier as described in claim 1, characterized in that, The control circuit includes a driver amplifier, which is used to amplify the drive signal.