CN204696950U - Magnetic suspension bearing switch power amplifier - Google Patents
Magnetic suspension bearing switch power amplifier Download PDFInfo
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- CN204696950U CN204696950U CN201520353093.6U CN201520353093U CN204696950U CN 204696950 U CN204696950 U CN 204696950U CN 201520353093 U CN201520353093 U CN 201520353093U CN 204696950 U CN204696950 U CN 204696950U
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Abstract
The utility model provides a kind of magnetic suspension bearing switch power amplifier, comprises governor circuit, drive circuit, three brachium pontis power main circuit and current sampling circuits; Three brachium pontis power main circuits comprise three brachium pontis and two bearing coils, the upper brachium pontis of the first brachium pontis and the 3rd brachium pontis is provided with switching tube, the lower brachium pontis of the second brachium pontis shared is provided with switching tube, or the lower brachium pontis of the first brachium pontis and the 3rd brachium pontis is provided with switching tube, the upper brachium pontis of the second brachium pontis shared is provided with switching tube, and on the second brachium pontis shared, the drive singal of switching tube has fixing duty ratio.Magnetic suspension bearing switch power amplifier of the present utility model reduces the volume of amplifier, reduce the switching loss of amplifier, and control mode is simple and convenient.
Description
Technical field
The utility model relates to switch power amplifier technical field, particularly relates to a kind of magnetic suspension bearing switch power amplifier.
Background technology
Magnetic suspension bearing control system generally adopts switch power amplifier, general employing H bridge topological structure.And in pure active magnetic bearing system, the electric current in coil is one-way flow, its H bridge topographical form is half-bridge structure, and half-bridge structure is made up of 2 brachium pontis, and each brachium pontis is made up of 1 controlled tr tube and 1 diode.A semibridge system H bridge controls a coil, in a 5DOF magnetic levitation bearing system, have 10 bearing coils, therefore need 10 semibridge system H bridges, namely 20 controlled tr tubes and 20 diodes are needed, therefore the power device needed for the program is more, and hardware cost is higher, and hardware volume is larger.
Prior art discloses a kind of full-bridge type three brachium pontis power amplifier scheme, three brachium pontis control two coils, adopt means of space vector representation to carry out PWM to 6 switching tubes.Although this mode controls two coils by sharing a brachium pontis, decrease the use of power device, it is the duty ratio being controlled 6 switching tubes by space vector technique, and control method is comparatively complicated, and switching power loss is larger.
Utility model content
In view of the present situation of prior art, the purpose of this utility model is to provide a kind of magnetic suspension bearing switch power amplifier, and reduce the volume of switch power amplifier, reduce cost, and switching loss is lower, control method is simple and reliable.
For achieving the above object, the utility model adopts following technical scheme:
A kind of magnetic suspension bearing switch power amplifier, comprise governor circuit, drive circuit, three brachium pontis power main circuit and current sampling circuits, described governor circuit, described drive circuit, described three brachium pontis power main circuits and described current sampling circuit circulate electrical connection successively;
Described three brachium pontis power main circuits comprise three brachium pontis and two bearing coils, two described bearing coils are respectively clutch shaft bearing coil L1 and the second bearing coil L2, three brachium pontis are respectively the first brachium pontis, the second brachium pontis and the 3rd brachium pontis, described clutch shaft bearing coil L1 is arranged between described first brachium pontis and described second brachium pontis, described second bearing coil L2 is arranged between described second brachium pontis and described 3rd brachium pontis, and described clutch shaft bearing coil L1 and described second bearing coil L2 shares described second brachium pontis;
The upper brachium pontis of described first brachium pontis and described 3rd brachium pontis is provided with switching tube, the lower brachium pontis of described second brachium pontis shared is provided with switching tube, or the lower brachium pontis of described first brachium pontis and described 3rd brachium pontis is provided with switching tube, the upper brachium pontis of described second brachium pontis shared is provided with switching tube, and on described second brachium pontis shared, the drive singal of switching tube has fixing duty ratio.
Wherein in an embodiment, described first brachium pontis comprises the first switch transistor T 1 and the first diode D1, and described second brachium pontis comprises second switch pipe T2 and the second diode D2, and described 3rd brachium pontis comprises the 3rd switch transistor T 3 and the 3rd diode D3;
The base stage of described first switch transistor T 1 connects described drive circuit, be applicable to input first drive singal g1, the emitter of described first switch transistor T 1 connects the negative electrode of described first diode D1, the anode of described first diode D1 connects the emitter of described second switch pipe T2, the collector electrode of described first switch transistor T 1 connects the negative electrode of described second diode D2, the anode of described second diode D2 connects the collector electrode of described second switch pipe T2, the base stage of described second switch pipe T2 connects described drive circuit, is applicable to input second drive singal g2;
The collector electrode of described 3rd switch transistor T 3 connects the negative electrode of described second diode D2, the base stage of described 3rd switch transistor T 3 connects described drive circuit, be applicable to input the 3rd drive singal g3, the emitter of described 3rd switch transistor T 3 connects the negative electrode of described 3rd diode D3, and the anode of described 3rd diode D3 connects the emitter of described second switch pipe T2;
One end of described clutch shaft bearing coil L1 connects the emitter of described first switch transistor T 1, the other end of described clutch shaft bearing coil L1 connects the collector electrode of described second switch pipe T2, one end of described second bearing coil L2 connects the collector electrode of described second switch pipe T2, and the other end of described second bearing coil L2 connects the emitter of described 3rd switch transistor T 3.
Wherein in an embodiment, described first brachium pontis comprises the first switch transistor T 1 and the first diode D1, and described second brachium pontis comprises second switch pipe T2 and the second diode D2, and described 3rd brachium pontis comprises the 3rd switch transistor T 3 and the 3rd diode D3;
The negative electrode of described first diode D1 connects the collector electrode of described second switch pipe T2, the anode of described first diode D1 connects the collector electrode of described first switch transistor T 1, the base stage of described first switch transistor T 1 connects described drive circuit, be applicable to input first drive singal g1, the emitter of described first switch transistor T 1 connects the anode of described second diode D2, the negative electrode of described second diode D2 connects the emitter of described second switch pipe T2, the base stage of described second switch pipe T2 connects described drive circuit, is applicable to input second drive singal g2;
The negative electrode of described 3rd diode D3 connects the collector electrode of described second switch pipe T2, the anode of described 3rd diode D3 connects the collector electrode of described 3rd switch transistor T 3, the emitter of described 3rd switch transistor T 3 connects the anode of described second diode D2, the base stage of described 3rd switch transistor T 3 connects described drive circuit, is applicable to input the 3rd drive singal g3;
One end of described clutch shaft bearing coil L1 connects the collector electrode of described first switch transistor T 1, the other end of described clutch shaft bearing coil L1 connects the emitter of described second switch pipe T2, one end of described second bearing coil L2 connects the emitter of described second switch pipe T2, and the other end of described second bearing coil L2 connects the collector electrode of described 3rd switch transistor T 3.
Wherein in an embodiment, described governor circuit comprises presetting module, PI control module and PWM generation module;
Described presetting module is applicable to preset first reference electric current I
ref1with the second reference current I
ref2, and preset the duty ratio of the PWM2 signal that switching tube is corresponding on described second brachium pontis;
Described PI control module is applicable to the actual current I according to described clutch shaft bearing coil
fdb1with the first reference current I preset
ref1error carry out PI adjustment, according to the actual current I of described second bearing coil
fdb2with the second reference current I preset
ref2error carry out PI adjustment;
Described PWM generation module is applicable to generate and exports PWM1 signal ~ PWM3 signal.
Wherein in an embodiment, described PWM1 signal and described PWM3 signal and described PWM2 signal inversion, and align with the high level center of described PWM2 signal in the low level center of described PWM1 signal and described PWM3 signal.
Wherein in an embodiment, described current sampling circuit comprises the first current sampling circuit and the second current sampling circuit, and described first current sampling circuit is connected with described clutch shaft bearing coil L1, is applicable to the actual current gathering described clutch shaft bearing coil L1; Described second current sampling circuit is connected with described second bearing coil L2, is applicable to the actual current gathering described second bearing coil L2.
Wherein in an embodiment, described current sampling circuit also comprises an A/D modular converter and the 2nd A/D modular converter, a described A/D modular converter is arranged between described first current sampling circuit and described governor circuit, and described 2nd A/D modular converter is arranged between described second current sampling circuit and described governor circuit.
Wherein in an embodiment, a described A/D modular converter and described 2nd A/D modular converter are A/D converter or operational amplifier.
Wherein in an embodiment, described three brachium pontis power main circuits also comprise the first resistance R1 and the second resistance R2, and described first resistance R1 and described clutch shaft bearing coil L1 is arranged in series, and described second resistance R2 and described second bearing coil L2 is arranged in series.
The beneficial effects of the utility model are:
Magnetic suspension bearing switch power amplifier of the present utility model, by the second brachium pontis adopting two bearing coils to share H bridge, achieve the electric current that three brachium pontis control two bearing coils of active magnetic suspension bearing, and on the second brachium pontis, switching tube adopts the PWM2 signal of fixed duty cycle as drive singal, makes control mode simple and convenient.And, magnetic suspension bearing switch power amplifier of the present utility model is when realizing the suspend control of 5DOF, only need 5 semibridge system three brachium pontis power main circuits, namely 15 controlled tr tubes and 15 diodes are needed altogether, reduce the volume of amplifier, reduce the cost of amplifier, reduce the switching loss of amplifier.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of magnetic suspension bearing switch power amplifier one embodiment of the present utility model;
Fig. 2 is the schematic diagram of another embodiment of magnetic suspension bearing switch power amplifier of the present utility model;
Fig. 3 is the hardware controls block diagram of magnetic suspension bearing switch power amplifier of the present utility model;
Fig. 4 is the Current Control flow chart of magnetic suspension bearing switch power amplifier middle (center) bearing coil 1 of the present utility model;
Fig. 5 is the Current Control flow chart of magnetic suspension bearing switch power amplifier middle (center) bearing coil 2 of the present utility model;
The control waveform figure that Fig. 6 is the duty ratio of PWM2 signal in the utility model when being 50%;
The control waveform figure that Fig. 7 is the duty ratio of PWM2 signal in the utility model when being 40%;
The control waveform figure that Fig. 8 is the duty ratio of PWM2 signal in the utility model when being 60%.
Embodiment
In order to make the technical solution of the utility model clearly, below in conjunction with accompanying drawing, magnetic suspension bearing switch power amplifier of the present utility model is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the utility model and to be not used in restriction the utility model.
See Fig. 1 to Fig. 8, as shown in Figure 1, magnetic suspension bearing switch power amplifier of the present utility model comprises governor circuit 100, drive circuit 200, three brachium pontis power main circuit 300 and current sampling circuit 400, and governor circuit 100, drive circuit 200, three brachium pontis power main circuit 300 and current sampling circuit 400 circulate electrical connection successively.
Wherein, three brachium pontis power main circuits 300 comprise three brachium pontis and two bearing coils, two bearing coils are respectively clutch shaft bearing coil L1 and the second bearing coil L2, three brachium pontis are respectively the first brachium pontis, the second brachium pontis and the 3rd brachium pontis, clutch shaft bearing coil L1 is arranged between the first brachium pontis and the second brachium pontis, second bearing coil L2 is arranged between the second brachium pontis and the 3rd brachium pontis, namely clutch shaft bearing coil L1 and the second bearing coil L2 shares the second brachium pontis of H bridge, achieves three brachium pontis to control the electric current of two bearing coils of active magnetic suspension bearing.
The upper brachium pontis of each brachium pontis or lower brachium pontis are provided with switching tube, particularly, the upper brachium pontis of the first brachium pontis and the 3rd brachium pontis are provided with switching tube, the lower brachium pontis of the second shared brachium pontis is provided with switching tube.Or the lower brachium pontis of the first brachium pontis and the 3rd brachium pontis is provided with switching tube, the upper brachium pontis of the second shared brachium pontis is provided with switching tube, and on described second brachium pontis shared, the drive singal of switching tube has fixing duty ratio.Like this, the control of the electric current of clutch shaft bearing coil L1 can be realized by the duty ratio controlling the drive singal of switching tube on the first brachium pontis, the control of the electric current to the second bearing coil L2 can be realized by the duty ratio of the drive singal controlling switching tube on the 3rd brachium pontis, make control method simple, be easy to realize.
Current sampling circuit 400 is applicable to the actual current of collection two bearing coils, and the actual current of collect two bearing coils is sent to governor circuit 100.More preferably, current sampling circuit 400 comprises the first current sampling circuit 401 and the second current sampling circuit 402.First current sampling circuit 401 is connected with clutch shaft bearing coil L1, is applicable to the actual current gathering clutch shaft bearing coil L1, and sends the actual current of clutch shaft bearing coil L1 to governor circuit 100.Second current sampling circuit 402 is connected with the second bearing coil L2, is applicable to the actual current of collection second bearing coil L2, and sends the actual current of the second bearing coil L2 collected to governor circuit 100.
More preferably, current sampling circuit 400 also comprises an A/D modular converter and the 2nd A/D modular converter, one A/D modular converter is arranged between the first current sampling circuit 401 and governor circuit 100, and the actual current being applicable to the clutch shaft bearing coil L1 collected by the first current sampling circuit 401 is converted into the digital signal that governor circuit 100 can identify.2nd A/D modular converter is arranged between the second current sampling circuit 402 and governor circuit 100, and the actual current being applicable to the second bearing coil L2 collected by the second current sampling circuit 402 is converted into the digital signal that governor circuit 100 can identify.More preferably, the A/D modular converter in the present embodiment and the 2nd A/D modular converter can adopt A/D converter or operational amplifier to realize.
Governor circuit 100 is applicable to export PWM1 signal ~ PWM3 signal, particularly, governor circuit 100 is applicable to the duty ratio of the PWM2 signal of switch transistor T 2 correspondence on default second brachium pontis, namely on the second brachium pontis of sharing of clutch shaft bearing coil L1 and the second bearing coil L2, the duty ratio of the PWM2 signal of switch transistor T 2 correspondence is fixed, and fixes to make the duty ratio of the second drive singal g2.Meanwhile, governor circuit 100 is applicable to the actual current I according to clutch shaft bearing coil L1
fdb1with the first reference current I preset
ref1export PWM1 signal, to control the duty ratio of the first drive singal g1.Governor circuit 100 is according to the actual current I of the second bearing coil L2
fdb2with the second reference current I preset
ref2export PWM3 signal, to control the duty ratio of the 3rd drive singal g3.Make the control method of this magnetic suspension bearing switch power amplifier simple and reliable like this, be convenient to realize.
Drive circuit 200 is applicable to the first drive singal g1 ~ the 3rd drive singal g3 PWM1 signal ~ PWM3 signal being converted into three brachium pontis power main circuits 300, and three brachium pontis power main circuits 300 control conducting or the shutoff of corresponding switching tube on three brachium pontis according to the first drive singal g1 ~ the 3rd drive singal g3.
As a kind of embodiment, the first brachium pontis comprises the first switch transistor T 1 and the first diode D1, and the second brachium pontis comprises second switch pipe T2 and the second diode D2, and the 3rd brachium pontis comprises the 3rd switch transistor T 3 and the 3rd diode D3.As shown in Figure 2, the first switch transistor T 1 is arranged on the upper brachium pontis of the first brachium pontis, and second switch pipe T2 is arranged on the lower brachium pontis of the second brachium pontis, and the 3rd switch transistor T 3 is arranged on the upper brachium pontis of the 3rd brachium pontis.Particularly, the base stage of the first switch transistor T 1 connects drive circuit 200, be applicable to input first drive singal g1, the emitter of the first switch transistor T 1 connects the negative electrode of the first diode D1, the anode of the first diode D1 connects the emitter of second switch pipe T2, and the collector electrode of the first switch transistor T 1 connects the negative electrode of the second diode D2.
The anode of the second diode D2 connects the collector electrode of second switch pipe T2, and the base stage of second switch pipe T2 connects drive circuit 200, is applicable to input second drive singal g2.The collector electrode of the 3rd switch transistor T 3 connects the negative electrode of the second diode D2, the base stage of the 3rd switch transistor T 3 connects drive circuit 200, be applicable to input the 3rd drive singal g3, the emitter of the 3rd switch transistor T 3 connects the negative electrode of the 3rd diode D3, and the anode of the 3rd diode D3 connects the emitter of second switch pipe T2.The first switch transistor T 1 in the present embodiment, second switch pipe T2 and the 3rd switch transistor T 3 all adopt negative-positive-negative transistor.In other embodiments, the first switch transistor T 1, second switch pipe T2 and the 3rd switching tube can also adopt metal-oxide-semiconductor or IGBT pipe etc.
One end of clutch shaft bearing coil L1 connects the emitter of the first switch transistor T 1, the other end of clutch shaft bearing coil L1 connects the collector electrode of second switch pipe T2, namely one end of clutch shaft bearing coil L1 is connected to the corresponding common port of the first switch transistor T 1 and the first diode D1, and the other end of clutch shaft bearing coil L1 is connected to the corresponding common port of second switch pipe T2 and the second diode D2.One end of second bearing coil L2 connects the collector electrode of second switch pipe T2, the other end of the second bearing coil L2 connects the emitter of the 3rd switch transistor T 3, namely one end of the second bearing coil L2 is connected to the corresponding common port of second switch pipe T2 and the second diode D2, and the other end of the second bearing coil L2 is connected to the corresponding common port of the 3rd switch transistor T 3 and the 3rd diode D3.
As another kind of embodiment, the first brachium pontis comprises the first switch transistor T 1 and the first diode D1, and the second brachium pontis comprises second switch pipe T2 and the second diode D2, and the 3rd brachium pontis comprises the 3rd switch transistor T 3 and the 3rd diode D3.As shown in Figure 3, the first switch transistor T 1 is arranged on the lower brachium pontis of the first brachium pontis, and second switch pipe T2 is arranged on the upper brachium pontis of the second brachium pontis, and the 3rd switch transistor T 3 is arranged on the lower brachium pontis of the 3rd brachium pontis.Particularly, the negative electrode of the first diode D1 connects the collector electrode of second switch pipe T2, and the anode of the first diode D1 connects the collector electrode of the first switch transistor T 1, and the base stage of the first switch transistor T 1 connects drive circuit 200, is applicable to input first drive singal g1.
The emitter of the first switch transistor T 1 connects the anode of the second diode D2, and the negative electrode of the second diode D2 connects the emitter of second switch pipe T2, and the base stage of second switch pipe T2 connects drive circuit 200, is applicable to input second drive singal g2.The negative electrode of the 3rd diode D3 connects the collector electrode of second switch pipe T2, the anode of the 3rd diode D3 connects the collector electrode of the 3rd switch transistor T 3, the emitter of the 3rd switch transistor T 3 connects the anode of the second diode D2, the base stage of the 3rd switch transistor T 3 connects drive circuit 200, is applicable to input the 3rd drive singal g3.The first switch transistor T 1 in the present embodiment, second switch pipe T2 and the 3rd switch transistor T 3 all adopt negative-positive-negative transistor.In other embodiments, the first switch transistor T 1, second switch pipe T2 and the 3rd switching tube can also adopt metal-oxide-semiconductor or IGBT pipe etc.
One end of clutch shaft bearing coil L1 connects the collector electrode of the first switch transistor T 1, the other end of clutch shaft bearing coil L1 connects the emitter of second switch pipe T2, one end of second bearing coil L2 connects the emitter of second switch pipe T2, and the other end of the second bearing coil L2 connects the collector electrode of the 3rd switch transistor T 3.
In order to prevent switch transistor T 1 ~ T3 breakdown, improve stability and the reliability of this magnetic suspension bearing switch power amplifier, on each brachium pontis switching tube emitter and collector between be all serially connected with the 4th diode, the quantity of the 4th diode is three.Namely the emitter of the first switching tube connects the anode of one of them the 4th diode, the negative electrode of connection the 4th diode that the collector electrode of the first switching tube is corresponding.The emitter of second switch pipe connects the anode of one of them the 4th diode, the negative electrode of connection the 4th diode that the collector electrode of second switch pipe is corresponding.The emitter of the 3rd switching tube connects the anode of the 4th diode, the negative electrode of connection the 4th diode that the collector electrode of the 3rd switching tube is corresponding.
Magnetic suspension bearing switch power amplifier of the present utility model, when realizing the suspend control of 5DOF, only needing 5 semibridge system three brachium pontis power main circuits, namely needing 15 switching tubes and 15 diodes.Therefore, in terms of existing technologies, the small volume of magnetic suspension bearing switch power amplifier of the present utility model, cost is lower, and switching loss is lower, has saved resource.
More preferably, three brachium pontis power main circuits 300 also comprise the first resistance R1 and the second resistance R2, and the first resistance R1 and clutch shaft bearing coil L1 is arranged in series, and the first current sampling circuit 401 is connected to the corresponding common port of the first resistance R1 and clutch shaft bearing coil L1.Second resistance R2 and the second bearing coil L2 is arranged in series, and the second current sampling circuit 402 is connected to the corresponding common port of the second resistance R2 and the second bearing coil L2.First resistance R1 and the second resistance R2 serves the effect of current limliting, protects clutch shaft bearing coil L1 and the second bearing coil L2 is not damaged.
As a kind of embodiment, governor circuit 100 comprises presetting module, PI control module and PWM generation module.Governor circuit in the present embodiment can adopt DSP (digital signal processor, digital signal processor), one or more combination in the processor such as FPGA (Field-Programmable Gate Array, programmable gate array), single-chip microcomputer or industrial computer.Wherein, presetting module is applicable to preset first reference electric current I
ref1with the second reference current I
ref2, and preset the duty ratio of the PWM2 signal that switching tube is corresponding on the second brachium pontis, to control the duty ratio of the second drive singal g2, the duty ratio of the PWM2 signal of switch transistor T 2 correspondence on the second brachium pontis is fixed.PWM generation module is applicable to generate and exports PWM1 signal ~ PWM3 signal.
PI control module is applicable to the actual current I according to clutch shaft bearing coil L1
fdb1with the first reference current I preset
ref1error carry out PI adjustment, and the result after being regulated by PI sends PWM generation module to, PWM generation module generates and exports PWM1 signal, to control the duty ratio of the first drive singal g1, thus the adjustment realized the actual current of clutch shaft bearing coil L1, make the actual current of clutch shaft bearing coil L1 close to the first reference current I preset
ref1.Meanwhile, PI control module is according to the actual current I of the second bearing coil L2
fdb2with the second reference current I preset
ref2error carry out PI adjustment, and the result after being regulated by PI is sent to PWM generation module, PWM generation module generates and exports PWM3 signal, to control the duty ratio of the 3rd drive singal g3, thus the adjustment realized the actual current of the second bearing coil L2, make the actual current of the second bearing coil L2 close to the second reference current I preset
ref2.
More preferably, PWM1 signal and PWM3 signal and PWM2 signal inversion, to prevent from leading directly to.And align with the high level center of PWM2 signal in the low level center of PWM1 signal and PWM3 signal, namely PWM1 signal and PWM3 signal all with PWM2 signal for reference signal.
Shown in Fig. 4 and Fig. 5, the control method of magnetic suspension bearing switch power amplifier of the present utility model, comprises the steps:
Preset first reference electric current I
ref1with the second reference current I
ref2;
Preset the duty ratio of the PWM2 signal of switch transistor T 2 correspondence on the second brachium pontis in three brachium pontis power main circuits 300, make the duty ratio of the second drive singal g2 be definite value;
The actual current I of the clutch shaft bearing coil L1 that the first current sampling circuit 401 transmits by governor circuit 100
fdb1with the first reference current I preset
ref1error through PI regulate after export PWM1 signal, to control the duty ratio of the first drive singal g1.Thus regulate the actual current flowing through clutch shaft bearing coil L1, make the actual current I of clutch shaft bearing coil L1
fdb1with the first reference current I preset
ref1deviation be close to 0.
The actual current I of the second bearing coil L2 that the second current sampling circuit 402 transmits by governor circuit 100
fdb2with the second reference current I preset
ref2error through PI regulate after export PWM3 signal, to control the duty ratio of the 3rd drive singal g3.Thus regulate the actual current flowing through the second bearing coil L2, make the actual current I of the second bearing coil L2
fdb2with the second reference current I preset
ref2deviation be close to 0.
As shown in Figure 4, for clutch shaft bearing coil L1, Current adjustment process is described below:
As the actual current I of clutch shaft bearing coil
fdb1be less than the first reference current I
ref1time, governor circuit 100 makes the duty ratio of the PWM1 signal of the first switch transistor T 1 correspondence increase after PI regulates, thus makes the actual current of clutch shaft bearing coil L1 increase.When the actual current of clutch shaft bearing coil L1 is greater than the first reference current I
ref1time, the duty ratio of the PWM1 signal that governor circuit makes the first switching tube corresponding after PI regulates reduces, thus the actual current of clutch shaft bearing coil L1 is declined, until the actual current of clutch shaft bearing coil L1 is close to the first reference current I
ref1.The Current adjustment process of the second bearing coil L2 is identical with said process, repeats no more herein.
As shown in Figure 6, the duty ratio of the PWM2 signal that second switch pipe T2 is corresponding is 50%, if when now the duty ratio of the PWM3 signal that the PWM1 signal of the first switch transistor T 1 correspondence is corresponding with the 3rd switch transistor T 3 is greater than 50%, two bearing coils have charging and afterflow two states, the actual current of bearing coil just likely rises, and the duty ratio of PWM1 signal and PWM3 signal is larger, the actual current of bearing coil rises more.Otherwise two bearing coils have electric discharge and afterflow two states, and the actual current of bearing coil will decline, and the duty ratio of PWM1 signal and PWM3 signal is less, the actual current of bearing coil declines more, and the minimum value of the actual current of bearing coil is 0.
As shown in Figure 7, the duty ratio of the PWM2 signal that second switch pipe T2 is corresponding is less than 50%, when being 40% for the duty ratio of PWM2 signal, if now the duty ratio of the PWM3 signal that the PWM1 signal of the first switch transistor T 1 correspondence is corresponding with the 3rd switch transistor T 3 is greater than 60%, two bearing coils have charging and afterflow two states, the actual current of bearing coil just likely rises, and the duty ratio of PWM1 signal and PWM3 signal is larger, and the actual current of bearing coil rises more.Otherwise two bearing coils have electric discharge and afterflow two states, and the actual current of bearing coil will decline, and the duty ratio of PWM1 signal and PWM3 signal is less, the actual current of bearing coil declines more, and the minimum value of the actual current of bearing coil is 0.
As shown in Figure 8, the duty ratio of the PWM2 signal that second switch pipe T2 is corresponding is greater than 50%, when being 60% for the duty ratio of PWM2 signal, if now the duty ratio of the PWM3 signal that the PWM1 signal of the first switch transistor T 1 correspondence is corresponding with the 3rd switch transistor T 3 is greater than 40%, two bearing coils have charging and afterflow two states, the actual current of bearing coil just likely rises, and the duty ratio of PWM1 signal and PWM3 signal is larger, and the actual current of bearing coil rises more.Otherwise two bearing coils have electric discharge and afterflow two states, and the actual current of bearing coil will decline, and the duty ratio of PWM1 signal and PWM3 signal is less, the actual current of bearing coil declines more, and the minimum value of the actual current of bearing coil is 0.
Magnetic suspension bearing switch power amplifier of the present utility model, by the second brachium pontis adopting two bearing coils to share H bridge, achieve the electric current that three brachium pontis control two bearing coils of active magnetic suspension bearing, and switching tube adopts the pwm signal of fixed duty cycle as drive singal on the second brachium pontis, not only make control mode simple and convenient, and, magnetic suspension bearing switch power amplifier of the present utility model is when realizing the suspend control of 5DOF, only need 5 semibridge system three brachium pontis power main circuits, namely 15 controlled tr tubes and 15 diodes are needed altogether, reduce the volume of amplifier, reduce the cost of amplifier, reduce the switching loss of amplifier.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. a magnetic suspension bearing switch power amplifier, it is characterized in that, comprise governor circuit (100), drive circuit (200), three brachium pontis power main circuits (300) and current sampling circuit (400), described governor circuit (100), described drive circuit (200), described three brachium pontis power main circuits (300) and described current sampling circuit (400) circulate electrical connection successively;
Described three brachium pontis power main circuits (300) comprise three brachium pontis and two bearing coils, two described bearing coils are respectively clutch shaft bearing coil L1 and the second bearing coil L2, three brachium pontis are respectively the first brachium pontis, the second brachium pontis and the 3rd brachium pontis, described clutch shaft bearing coil L1 is arranged between described first brachium pontis and described second brachium pontis, described second bearing coil L2 is arranged between described second brachium pontis and described 3rd brachium pontis, and described clutch shaft bearing coil L1 and described second bearing coil L2 shares described second brachium pontis;
The upper brachium pontis of described first brachium pontis and described 3rd brachium pontis is provided with switching tube, the lower brachium pontis of described second brachium pontis shared is provided with switching tube, or the lower brachium pontis of described first brachium pontis and described 3rd brachium pontis is provided with switching tube, the upper brachium pontis of described second brachium pontis shared is provided with switching tube, and on described second brachium pontis shared, the drive singal of switching tube has fixing duty ratio.
2. magnetic suspension bearing switch power amplifier according to claim 1, it is characterized in that, described first brachium pontis comprises the first switch transistor T 1 and the first diode D1, described second brachium pontis comprises second switch pipe T2 and the second diode D2, and described 3rd brachium pontis comprises the 3rd switch transistor T 3 and the 3rd diode D3;
The base stage of described first switch transistor T 1 connects described drive circuit (200), be applicable to input first drive singal g1, the emitter of described first switch transistor T 1 connects the negative electrode of described first diode D1, the anode of described first diode D1 connects the emitter of described second switch pipe T2, the collector electrode of described first switch transistor T 1 connects the negative electrode of described second diode D2, the anode of described second diode D2 connects the collector electrode of described second switch pipe T2, the base stage of described second switch pipe T2 connects described drive circuit (200), be applicable to input second drive singal g2,
The collector electrode of described 3rd switch transistor T 3 connects the negative electrode of described second diode D2, the base stage of described 3rd switch transistor T 3 connects described drive circuit (200), be applicable to input the 3rd drive singal g3, the emitter of described 3rd switch transistor T 3 connects the negative electrode of described 3rd diode D3, and the anode of described 3rd diode D3 connects the emitter of described second switch pipe T2;
One end of described clutch shaft bearing coil L1 connects the emitter of described first switch transistor T 1, the other end of described clutch shaft bearing coil L1 connects the collector electrode of described second switch pipe T2, one end of described second bearing coil L2 connects the collector electrode of described second switch pipe T2, and the other end of described second bearing coil L2 connects the emitter of described 3rd switch transistor T 3.
3. magnetic suspension bearing switch power amplifier according to claim 1, it is characterized in that, described first brachium pontis comprises the first switch transistor T 1 and the first diode D1, described second brachium pontis comprises second switch pipe T2 and the second diode D2, and described 3rd brachium pontis comprises the 3rd switch transistor T 3 and the 3rd diode D3;
The negative electrode of described first diode D1 connects the collector electrode of described second switch pipe T2, the anode of described first diode D1 connects the collector electrode of described first switch transistor T 1, the base stage of described first switch transistor T 1 connects described drive circuit (200), be applicable to input first drive singal g1, the emitter of described first switch transistor T 1 connects the anode of described second diode D2, the negative electrode of described second diode D2 connects the emitter of described second switch pipe T2, the base stage of described second switch pipe T2 connects described drive circuit (200), be applicable to input second drive singal g2,
The negative electrode of described 3rd diode D3 connects the collector electrode of described second switch pipe T2, the anode of described 3rd diode D3 connects the collector electrode of described 3rd switch transistor T 3, the emitter of described 3rd switch transistor T 3 connects the anode of described second diode D2, the base stage of described 3rd switch transistor T 3 connects described drive circuit (200), is applicable to input the 3rd drive singal g3;
One end of described clutch shaft bearing coil L1 connects the collector electrode of described first switch transistor T 1, the other end of described clutch shaft bearing coil L1 connects the emitter of described second switch pipe T2, one end of described second bearing coil L2 connects the emitter of described second switch pipe T2, and the other end of described second bearing coil L2 connects the collector electrode of described 3rd switch transistor T 3.
4. magnetic suspension bearing switch power amplifier according to claim 1, is characterized in that, described governor circuit (100) comprises presetting module, PI control module and PWM generation module;
Described presetting module is applicable to preset first reference electric current I
ref1with the second reference current I
ref2, and preset the duty ratio of the PWM2 signal that switching tube is corresponding on described second brachium pontis;
Described PI control module is applicable to the actual current I according to described clutch shaft bearing coil
fdb1with the first reference current I preset
ref1error carry out PI adjustment, according to the actual current I of described second bearing coil
fdb2with the second reference current I preset
ref2error carry out PI adjustment;
Described PWM generation module is applicable to generate and exports PWM1 signal ~ PWM3 signal.
5. magnetic suspension bearing switch power amplifier according to claim 4, it is characterized in that, described PWM1 signal and described PWM3 signal and described PWM2 signal inversion, and align with the high level center of described PWM2 signal in the low level center of described PWM1 signal and described PWM3 signal.
6. the magnetic suspension bearing switch power amplifier as requested described in any one of 1-5, it is characterized in that, described current sampling circuit (400) comprises the first current sampling circuit (401) and the second current sampling circuit (402), described first current sampling circuit (401) is connected with described clutch shaft bearing coil L1, is applicable to the actual current gathering described clutch shaft bearing coil L1; Described second current sampling circuit (402) is connected with described second bearing coil L2, is applicable to the actual current gathering described second bearing coil L2.
7. magnetic suspension bearing switch power amplifier according to claim 6, it is characterized in that, described current sampling circuit (400) also comprises an A/D modular converter and the 2nd A/D modular converter, a described A/D modular converter is arranged between described first current sampling circuit (401) and described governor circuit (100), and described 2nd A/D modular converter is arranged between described second current sampling circuit (402) and described governor circuit (100).
8. magnetic suspension bearing switch power amplifier according to claim 7, is characterized in that, a described A/D modular converter and described 2nd A/D modular converter are A/D converter or operational amplifier.
9. the magnetic suspension bearing switch power amplifier according to any one of claim 1-5, it is characterized in that, described three brachium pontis power main circuits (300) also comprise the first resistance R1 and the second resistance R2, described first resistance R1 and described clutch shaft bearing coil L1 is arranged in series, and described second resistance R2 and described second bearing coil L2 is arranged in series.
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| CN201520353093.6U CN204696950U (en) | 2015-05-27 | 2015-05-27 | Magnetic suspension bearing switch power amplifier |
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|---|---|---|---|
| CN201520353093.6U CN204696950U (en) | 2015-05-27 | 2015-05-27 | Magnetic suspension bearing switch power amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333010A (en) * | 2015-12-11 | 2016-02-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic bearing control device and magnetic bearing system |
| WO2016188462A1 (en) * | 2015-05-27 | 2016-12-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetically suspended bearing switching power amplifier and control method thereof |
| CN107304786A (en) * | 2016-04-22 | 2017-10-31 | 英格索尔-兰德公司 | Active magnetic bearings control device |
| CN114110022A (en) * | 2021-11-16 | 2022-03-01 | 珠海格力电器股份有限公司 | Magnetic suspension bearing control device and method and magnetic suspension bearing system |
-
2015
- 2015-05-27 CN CN201520353093.6U patent/CN204696950U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016188462A1 (en) * | 2015-05-27 | 2016-12-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetically suspended bearing switching power amplifier and control method thereof |
| CN106301036A (en) * | 2015-05-27 | 2017-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic suspension bearing switch power amplifier and control method thereof |
| CN106301036B (en) * | 2015-05-27 | 2019-01-01 | 珠海格力电器股份有限公司 | Magnetic suspension bearing switch power amplifier and its control method |
| CN105333010A (en) * | 2015-12-11 | 2016-02-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic bearing control device and magnetic bearing system |
| CN107304786A (en) * | 2016-04-22 | 2017-10-31 | 英格索尔-兰德公司 | Active magnetic bearings control device |
| CN114110022A (en) * | 2021-11-16 | 2022-03-01 | 珠海格力电器股份有限公司 | Magnetic suspension bearing control device and method and magnetic suspension bearing system |
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