CN201181928Y - Rotor variable-frequency control apparatus based on slope compensating current control model - Google Patents
Rotor variable-frequency control apparatus based on slope compensating current control model Download PDFInfo
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- CN201181928Y CN201181928Y CNU2008200699656U CN200820069965U CN201181928Y CN 201181928 Y CN201181928 Y CN 201181928Y CN U2008200699656 U CNU2008200699656 U CN U2008200699656U CN 200820069965 U CN200820069965 U CN 200820069965U CN 201181928 Y CN201181928 Y CN 201181928Y
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- circuit
- slope
- current control
- controller
- adjusting device
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Abstract
The utility model discloses a frequency-variable rotor speed regulator based on a slope-compensated current control mode, which comprises a controller; wherein, the input end of the controller is respectively connected with a current-sampling circuit, a voltage-sampling circuit and a rotation speed-specifying circuit; the output end of the controller is connected with an IGBT driver circuit which is connected with an IGBT tube; and the controller comprises a current control module based on slope compensation. Since the controller of the frequency-variable rotor speed regulator adopting the technical scheme adopts the current control mode based on slope compensation, the design problem of the conventional PI regulator controlling a non-linear circuit can be resolved; meanwhile, compared with hysteresis current control, the switching frequency can be fixed, so that the circuit can be easily designed; compared with peak two-point control, while the switching frequency is fixed, the subharmonic oscillation phenomenon can be eliminated; and moreover, the circuit can be easily designed and is stable.
Description
Technical field
The utility model relates to a kind of rotor frequency conversion speed-adjusting device, particularly a kind of rotor frequency conversion speed-adjusting device based on the slope compensation current control model.
Background technology
The rotor frequency conversion speed-adjusting device that is applicable to the winding-type AC asynchronous motor extensively adopts electric current, rotating speed double circle controling mode, but because the DC loop electric current is regulated by duty ratio D, and duty ratio and DC loop electric current are non-linear relations, the effect that electric current loop adopts pi regulator to be difficult to realize ideal.Electric current loop also can adopt the ring control that stagnates, but switching frequency changes to circuit design and brings difficulty.Electric current loop adopts the control of peak value two point form can fixed switching frequency, but brings stability problem again simultaneously, is prone to the subharmonic oscillation phenomenon.
Summary of the invention
The purpose of this utility model provides a kind of rotor frequency conversion speed-adjusting device based on the slope compensation current control model.
For achieving the above object, the utility model is by the following technical solutions:
The utility model comprises controller, the input of controller is connected with current sampling circuit, voltage sampling circuit and rotation-speed setting circuit respectively, the output of controller is connected with the IGBT drive circuit, the IGBT drive circuit links to each other with the IGBT pipe, and above-mentioned controller adopts the current control mode based on slope-compensation.
Above-mentioned controller is based on the current control module of slope-compensation.
Comprise slope equalizer and duty cycle adjustment circuit in the above-mentioned controller.
Above-mentioned slope equalizer comprises the negative slope saw-toothed wave generator, and described negative slope saw-toothed wave generator output links to each other with the adder input, and another input of adder is connected with rotation-speed setting circuit; The output of adder is connected to the input of first comparator; Another input of first comparator is connected with current sampling circuit.
Above-mentioned duty cycle adjustment circuit comprises clock circuit, and clock circuit links to each other with counter, and counter is connected to the input of first comparator by monostable circuit; Counter links to each other with the IGBT drive circuit by second comparator.
Adopt Hall element in the above-mentioned current sampling circuit.
Adopt the utility model of technique scheme, owing in controller, adopt current control mode based on slope-compensation, can eliminate the design challenges of bringing with traditional PI adjuster control nonlinear circuit, comparing with hysteresis current control simultaneously can fixed switching frequency, be easy to circuit design, compare with peak value two point form control and can in fixed switching frequency, eliminate the subharmonic oscillation phenomenon, and circuit design is simple, good stability.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is a circuit working schematic diagram of the present utility model;
Fig. 3 is an oscillogram of the present utility model;
Fig. 4 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, in motor speed regulation system, mainly be divided into two parts, main circuit partly is the rotor frequency conversion speed-adjusting device, and controlling object is wound type asynchronous machine or interior feed machine, and control section is the control circuit part based on the slope compensation current control model.The utility model comprises controller, the input of controller is connected with current sampling circuit, voltage sampling circuit and rotation-speed setting circuit respectively, the output of controller is connected with the IGBT drive circuit, the IGBT drive circuit links to each other with the IGBT pipe, and above-mentioned controller adopts the current control mode based on slope-compensation.Comprise slope equalizer and duty cycle adjustment circuit in the controller.Adopt Hall element in the current sampling circuit, select the magnetic balance type Hall element of LEM or other brand of fine quality in the utility model for use.
As Fig. 2, Fig. 3, shown in Figure 4, in the utility model, slope equalizer comprises the negative slope saw-toothed wave generator, and described negative slope saw-toothed wave generator produces a negative slope sawtooth signal Δ U
* I, through D/A digital-to-analogue conversion, negative slope sawtooth signal Δ U
* IInput to the input of adder, the given I of electric current of another input of adder and rotation-speed setting circuit output
* DRBe connected, make U
* I=I
* DR+ Δ U
* IThe output of adder is connected to the input of first comparator; The rotor-side direct current I of another input of first comparator and current sampling circuit output
DRBe connected.Allow U
* IReplace electric current set-point I
* DRWith rotor-side direct current I
DRCompare, make the mean value I of feedback current
AvEqual electric current set-point I
* DRRelatively the back forms copped wave.Characteristics after handling like this are: the definition that has improved intersection point; Rotor-side direct current I
DRMean value I
AvEqual electric current set-point I
* DRStable in the duty ratio gamut; Switching frequency is fixed; Also can operate as normal during discontinuous current; No adjuster, nonlinear Control.
In order to guarantee IGBT device reliably working, prevent from just to open just and turn-off, otherwise or phenomenon take place, in the beginning in each cycle with finish all to be provided with the pulse of forcing action: begin the back in the cycle and force conducting 10 μ s, before end cycle, force to turn-off 10 μ s, also promptly respectively to minimum duty cycle D
MinWith maximum duty cycle D
MaxDone restriction.Described duty cycle adjustment circuit comprises clock circuit, and clock circuit adopts 555 time-base circuits, and clock circuit links to each other with down counter, and down counter adopts 74HC688, and down counter is connected to the input of first comparator by monostable circuit; Down counter links to each other with the IGBT drive circuit by second comparator.First comparator and second comparator all adopt LM393 in the utility model.
Claims (6)
1, a kind of rotor frequency conversion speed-adjusting device based on the slope compensation current control model, it comprises controller, the input of controller is connected with current sampling circuit, voltage sampling circuit and rotation-speed setting circuit respectively, the output of controller is connected with the IGBT drive circuit, the IGBT drive circuit links to each other with the IGBT pipe, and it is characterized in that: described controller comprises the current control module based on slope-compensation.
2, the rotor frequency conversion speed-adjusting device based on the slope compensation current control model according to claim 1, it is characterized in that: described controller is based on the current control module of slope-compensation.
3, the rotor frequency conversion speed-adjusting device based on the slope compensation current control model according to claim 1 and 2 is characterized in that: comprise slope equalizer and duty cycle adjustment circuit in the described current control module based on slope-compensation.
4, the rotor frequency conversion speed-adjusting device based on the slope compensation current control model according to claim 3, it is characterized in that: described slope equalizer comprises the negative slope saw-toothed wave generator, described negative slope saw-toothed wave generator output links to each other with the adder input, and another input of adder is connected with rotation-speed setting circuit; The output of adder is connected to the input of first comparator; Another input of first comparator is connected with current sampling circuit.
5, the rotor frequency conversion speed-adjusting device based on the slope compensation current control model according to claim 3, it is characterized in that: described duty cycle adjustment circuit comprises clock circuit, clock circuit links to each other with counter, and counter is connected to the input of first comparator by monostable circuit; Counter links to each other with the IGBT drive circuit by second comparator.
6, the rotor frequency conversion speed-adjusting device based on the slope compensation current control model according to claim 1 is characterized in that: adopt Hall element in the described current sampling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200699656U CN201181928Y (en) | 2008-04-10 | 2008-04-10 | Rotor variable-frequency control apparatus based on slope compensating current control model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200699656U CN201181928Y (en) | 2008-04-10 | 2008-04-10 | Rotor variable-frequency control apparatus based on slope compensating current control model |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201181928Y true CN201181928Y (en) | 2009-01-14 |
Family
ID=40251420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200699656U Expired - Fee Related CN201181928Y (en) | 2008-04-10 | 2008-04-10 | Rotor variable-frequency control apparatus based on slope compensating current control model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201181928Y (en) |
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2008
- 2008-04-10 CN CNU2008200699656U patent/CN201181928Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090114 Termination date: 20100410 |