CN101349890B - Method for inhibiting feed back control circuit instability and circuit thereof - Google Patents
Method for inhibiting feed back control circuit instability and circuit thereof Download PDFInfo
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- CN101349890B CN101349890B CN200810118772XA CN200810118772A CN101349890B CN 101349890 B CN101349890 B CN 101349890B CN 200810118772X A CN200810118772X A CN 200810118772XA CN 200810118772 A CN200810118772 A CN 200810118772A CN 101349890 B CN101349890 B CN 101349890B
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- correction link
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Abstract
The invention relates to a method for inhibiting the instability of a feedback control circuit and a circuit thereof, belonging to the automatic control technical field, which is suitable for the negative feedback circuit controlling a switch circuit device. The method adds a correction link 3 in a common closed control loop formed by an adjuster 1, a switch signal conversion link 2 and an object 4, wherein the correction link 3 is connected between the switch signal conversion link 2 and the adjuster 1, the circuit is composed of an adjuster 1, a switch signal conversion link 2, a correction link 3 and an object 4, the correction link 3 filters the low frequency components of the switch signals, the adjuster 1 processes error signals and the signals provided with the correction link 3, while the processed result is confirmed by the error signals and the signals provided with the correction link 3 together. The method has the advantages that the method not requires the controlled object to provide a mathematical model and can use a simple circuit to inhibit the instability of negative feedback circuits.
Description
Technical field
Present technique belongs to automation field, is applicable to the negative-feedback circuit of gauge tap circuit arrangement.
Background technology
Negative feed back control system is the important step in the control automatically, its effect is self regulating by loop, make input and output keep certain specific relation, be widely used in electronic equipment or the control system, be used for the technical feature of raising equipment or system or realize the function that certain is specific.Switch circuit devices is meant and contains semiconductor switch device, the device that has energy conversion or have control function, as Switching Power Supply or with the system of the turn-on and turn-off control executing mechanism of semiconductor switch device motion, as with devices such as the temperature of switching device control, pressure, speed, displacements.Can use response speed, the quality of a static error and a feedback control system of estimation of stability.Wherein stability is the condition precedent that feedback system can be used, and the control system of a unstability can't be used.From the angle of Design Theory feedback control system, as desire to avoid the control system unstability, need set up the mathematical model of controlled system, just might judge unstability, suppress unstability with existing control theories.But when the structure and parameter of controlled device can not be on top of, or when can not get precise math model, the structure and parameter of feedback system controller must rely on experience and field adjustable to determine, can only design a regulator this moment in advance, as the PID regulator of normal use, determine the parameter of regulator by repetition test.Because the complicacy of controlled device, even some application cost extensive work, control system also is difficult to stable operation.
As everyone knows, the stability of feedback control system is by himself structures shape.When a control system unstability, can adopt the method that increases correction link to suppress unstability, as can connect to the proportional governor of a unstability integral correction link or differential correction link.The characteristics of existing regulator are only error signal to be carried out computing.When unstability occurring as a regulator computing and the proportional signal of error signal, just increase the differential signal and the integrated signal of arithmetic eror signal, error signal is the difference of reference signal and feedback signal.Owing to will from controlled device, extract feedback signal, this method is very strong to the characteristic dependence of controlled device, being one as controlled device can't describe with mathematical model, have simultaneously big inertia again and frequently be subjected to the physical quantity of external interference, existing bearing calibration is difficult to the effect that reaches satisfied.
Summary of the invention
The purpose of this invention is to provide a kind of method and circuit thereof, promptly in existing negative-feedback circuit, increase a correction link 3, this correction link 3 is connected between regulator and the switching signal, switching signal is meant the signal of the switching device in the driving switch circuit arrangement, allow not only arithmetic eror signal of regulator, also computing switching signal, thus utilize switching signal that the output movement of regulator is regulated, can suppress the unstability of feedback control system.
Technical method of the present invention is as follows: set up negative feedback control circuit, circuit is by regulator 1, and switching signal conversion links 2 and controlled device 4 constitute.The input termination reference signal and the feedback signal of regulator 1, regulator 1 is by computing reference signal and feedback signal, determine the output signal of regulator 1, the output signal of regulator 1 converts the switching signal that drives semiconductor switch device to through switching signal conversion links 2, switching signal drives controlled device 4, controlled device 4 is the switch circuit devices that contain semiconductor devices, controlled device 4 output feedback signals.It is characterized in that: said switching signal conversion links 2 also connects a correction link 3, the output terminal of correction link 3 connects the input end of regulator 1, the function of correction link 3 is the low frequency components in the filtering switching signal, the information that regulator 1 also transmits by computing correction link 3 makes controlled device 4 operate in steady state (SS).
Described correction link 3 can be the single order Hi-pass filter.
Can realize following negative-feedback circuit according to said method: circuit is by regulator 1, and switching signal conversion links 2 and controlled device 4 constitute.The input termination reference signal and the feedback signal of regulator 1, the output termination switching signal conversion links 2 of regulator 1, switching signal conversion links 2 converts the output signal of regulator 1 to drive semiconductor switch device switching signal, switching signal conversion links 2 connects the semiconductor switch device in the controlled device 4, controlled device 4 is the switch circuit devices that contain semiconductor devices, controlled device 4 output feedback signals, feedback signal is connected with the input end of regulator 1.It is characterized in that: switching signal conversion links 2 also connects the correction link 3 of a low frequency component in can the filtering switching signal, and the output terminal of correction link 3 is connected to the input end of regulator 1.
Described correction link 3 can be the single order Hi-pass filter.The single order Hi-pass filter is made up of the circuit of resistance and capacitances in series.
Described correction link 3 can be applied in proportional integral and regulate in the negative feedback control loop, at this moment regulator 1 is the proportional integral regulating circuit, switching signal conversion links 2 for the output signal of regulator 1 by relatively changing into the circuit of switching signal with sawtooth wave.
Described correction link 3 ratio that also can be applied in is regulated in the negative feedback control loop, and regulator 1 at this moment be the ratio regulating circuit, and switching signal conversion links 2 is by relatively changing into the circuit of switching signal with sawtooth wave with the output signal of regulator 1.
Described correction link 3 can also be applied in two closed loop proportional integrations and regulate in the negative feedback control loop, at this moment regulator 1 is for by proportional integral regulating circuit and inner two the two closed loop proportional integration regulating circuits that operational amplifier constitutes of the integrated control chip UC3856 of current mode, and switching signal conversion links 2 is exported by the internal comparator of the integrated control chip UC3856 of current mode and internal logic circuit and two-way thereof and constituted.
The invention has the beneficial effects as follows: need not know the mathematical model of controlled device 4, just can suppress the unstability of the feedback control system of switch circuit devices by the straightforward procedure that increases a correction link 3.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is the close loop negative feedback control principle figure that uses correction link in the proportional integral regulating loop.
Fig. 3 is the close loop negative feedback control principle figure that uses correction link in the ratio regulating loop.
Fig. 4 is a kind of two close loop negative feedback control principle figure that use correction link
Among the figure 1, regulator, 2, the switching signal conversion links, 3, correction link, 4, controlled device.
Embodiment
Further specify embodiment of the present invention below in conjunction with accompanying drawing, technical scheme of the present invention is mainly used in switch circuit devices.
Fig. 1 is a theory diagram of the present invention, and Vref is a reference signal, and Vf is a feedback signal, and Vm is the output signal of correction link 3.Regulator 1 output is controlled by the output signal Vm of error signal and correction link 3, and error signal is meant the difference signal of reference signal and feedback signal.Compare with general control loop, feature of the present invention is many with a correction link 3, its information extraction from the switching signal of gauge tap device, because switching signal contains the information of having covered regulator 1 output movement state, can utilize this signal that damping action is played in the output movement variation of regulator 1, therefore can suppress the unstability of feedback control system.The Vm signal is meant that to the damping action of regulator motion change the output that the Vm signal hinders regulator changes when error signal changes the output of regulator.
The principle explanation of Fig. 2 is connected to the embodiment of the proportional integral regulating loop of correction link 3, and wherein proportional and integral controller 1 is made of by known technology amplifier, electric capacity, resistance.The circuit of switching signal conversion links 2 also is to constitute (as shown in the figure) by known technology, and its function is relatively to convert regulator 1 output signal and sawtooth wave to switch controlling signal.Vref is a reference signal among the figure, and Vf is a feedback signal, and Vm is the output signal of correction link 3, R1.1, R1.2, R1.3, R3.1 are resistance, and C1.1 is an integrating capacitor, and C1.2 is a low-pass filtering electric capacity, C3.1 is a high-pass filtering electric capacity, and Op1.1 is an operational amplifier, and Cp2.1 is a comparer.Adopt a specific embodiment of this scheme to be: controlled device 4 is Switching Power Supplies, and inductance capacitor filtering is adopted in power supply output: inductance 10 milihenries, electric capacity 100 microfarads; R1.1=40k Ω in the integral controller 1, R1.2=40k Ω, R1.3=400k Ω, C1.1=0.47uF, C1.2=0.01uF; Unstable phenomenon appears in power supply during power switch frequency 3000Hz; After adding correction link 3, output is stable; R3.1=20k Ω in the correction link 3, C3.1=0.22uF.Switching signal behind the process Hi-pass filter damping power that 1 output changes to regulator depends on resistance value and the capacitance in the Hi-pass filter, such as reducing resistance value, increases capacitance and just strengthens damping, and vice versa.Damping is beneficial to the stability of control system greatly, but increases the response time.In this example,, increase the capacitance of C3.1, still can keep output stable, but the response time to prolong as continuing to reduce the resistance value of R3.1.
Fig. 3 is the embodiment that is connected to the ratio regulating loop of correction link 3, Vref is a reference signal among the figure, Vf is a feedback signal, Vm is the output signal of correction link 3, R1.1, R1.2, R1.3, R3.1 are resistance, and C1.2 is a low-pass filtering electric capacity, and C3.1 is a high-pass filtering electric capacity, Op1.1 is an operational amplifier, and Cp2.1 is a comparer.With the difference of Fig. 2 be: regulator 1 adopts proportional governor.For controlled device same among the top embodiment 4, in this scheme: R1.1=20k Ω, R1.2=20k Ω, R1.3=1000k Ω, C1.2=0.01uF, R3.1=60k Ω; C3.1=0.1uF can realize stable control.
Fig. 4 is the another kind of embodiment of using the proportional integral regulating loop of correction link 3, is two closed-loop controls.Among the figure, Vf1 and Vf2 are the two-way feedback signals that controlled device 4 offers regulator 1, and R1.1, R1.2, R1.3, R1.4 are resistance, and C1.2 is an electric capacity, and Op1.1 is an operational amplifier.This example has adopted the integrated control chip UC3856 of current mode, and its inner operational amplifier Op1.2, Op1.3, diode D1.1 add that the proportional integral regulating circuit constitutes two closed loop proportional integration regulating circuits; The operation instruction that C/S+, C/S-, EA+, EA-meaning etc. provide referring to producer among the figure.Comparator C p2.1 in the switching signal conversion links 2 also is the comparer of UC3856 inside; The integrated logic circuit of UC3856 inside is represented with solid box Log2.1; Aout, Bout are the two-way output of UC3856, and details are referring to the UC3856 operation instructions.In the correction link 3, R3.1 is a resistance, and C3.1 is an electric capacity, and Vm is the output signal of correction link 3.Adopt an embodiment of two closed-loop controls to be: controlled device 4 is motor displacement systems as topworks.Controlled device 4 provides regulator 1 two-way feedback signal, and wherein Vf2 is the armature current signal, and Vf1 is and the proportional signal of displacement.Two closed-loop controls of motor are known technologies, can be referring to related data.In this example, regulator 1 parameter: R1.1=20k Ω, R1.2=20k Ω, R1.3=200k Ω, R1.4=24 Ω, C1.1=0.47uF, C1.2=0.01uF; Switching signal conversion links 2 parameters: R2.1=2k Ω; This example is unstability before correction up device not, and it is stable to add correction link 3 backs; Correction link 3 parameters: R3.1=40k Ω; C3.1=0.47uF.
Claims (8)
1. method that suppresses the feedback control circuit unstability, this feedback control circuit is the negative-feedback circuit of gauge tap circuit arrangement, comprise regulator (1), switching signal conversion links (2) and controlled device (4), the input termination reference signal and the feedback signal of regulator (1), regulator (1) is by computing reference signal and feedback signal, determine the output signal of regulator (1), the output signal of regulator (1) converts the switching signal that drives semiconductor switch device to through switching signal conversion links (2), switching signal drives controlled device (4), controlled device (4) is the switch circuit devices that contains semiconductor devices, controlled device (4) output feedback signal, it is characterized in that: switching signal conversion links (2) also connects a correction link (3), the output terminal of correction link (3) is connected to the input end of regulator (1), the function of correction link (3) is the low frequency component in the filtering switching signal, high fdrequency component in the switching signal is passed to regulator (1), and the output signal of correction link (3) plays damping action to the output movement variation of regulator (1); Regulator (1) makes controlled device (4) operate in steady state (SS) by the information that computing correction link (3) transmits.
2. a kind of method that suppresses the feedback control circuit unstability according to claim 1, it is characterized in that: described correction link (3) adopts the single order Hi-pass filter, the output signal of said correction link (3) the damping power that output changes to regulator (1) depends on the resistance value and the capacitance of said Hi-pass filter, reduce resistance value, increase capacitance and just strengthen damping, vice versa.
3. circuit that suppresses the feedback control circuit unstability, this feedback control circuit is the negative-feedback circuit of gauge tap circuit arrangement, comprise regulator (1), switching signal conversion links (2) and controlled device (4), the input termination reference signal and the feedback signal of regulator (1), the output termination switching signal conversion links (2) of regulator (1), switching signal conversion links (2) converts the output signal of regulator (1) to drive semiconductor switch device switching signal, switching signal conversion links (2) connects the semiconductor switch device in the controlled device (4), controlled device (4) is the switch circuit devices that contains semiconductor devices, controlled device (4) output feedback signal, feedback signal is connected with the input end of regulator (1); It is characterized in that: switching signal conversion links (2) also connects the correction link (3) of a low frequency component in can the filtering switching signal.
4. a kind of circuit that suppresses the feedback control circuit unstability according to claim 3 is characterized in that: described correction link (3) is the single order Hi-pass filter.
5. a kind of circuit that suppresses the feedback control circuit unstability according to claim 4 is characterized in that: described single order Hi-pass filter is made up of the circuit of resistance and capacitances in series.
6. a kind of circuit that suppresses the feedback control circuit unstability according to claim 5 is characterized in that: described regulator (1) is the proportional integral regulating circuit; Described switching signal conversion links (2) for the output signal of regulator (1) by relatively changing into the circuit of switching signal with sawtooth wave.
7. a kind of circuit that suppresses the feedback control circuit unstability according to claim 5 is characterized in that: described regulator (1) is the ratio regulating circuit; Described switching signal conversion links (2) for the output signal of regulator (1) by relatively changing into the circuit of switching signal with sawtooth wave.
8. a kind of circuit that suppresses the feedback control circuit unstability according to claim 5, it is characterized in that: adopt and contain two operational amplifiers, the integrated control chip UC3856 of current mode that comparer, integrated logic circuit, two-way are exported, described regulator (1) is by proportional integral regulating circuit and inner two the two closed loop proportional integration regulating circuits that operational amplifier constitutes of the integrated control chip UC3856 of current mode; Described switching signal conversion links (2) is made of the internal comparator of the integrated control chip UC3856 of current mode and internal logic circuit and the peripheral cell that is connected with its two-way output: two-way is exported two reference mark that connect controlled device (4), and respectively by being connected to correction link (3) behind the diode mutually.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810118772XA CN101349890B (en) | 2008-08-22 | 2008-08-22 | Method for inhibiting feed back control circuit instability and circuit thereof |
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| CN200810118772XA CN101349890B (en) | 2008-08-22 | 2008-08-22 | Method for inhibiting feed back control circuit instability and circuit thereof |
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| CN101349890A CN101349890A (en) | 2009-01-21 |
| CN101349890B true CN101349890B (en) | 2011-07-27 |
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| KR101116946B1 (en) * | 2010-04-09 | 2012-03-14 | 엘에스산전 주식회사 | Apparatus for changing mode in Proportional Integral Differential controller |
| FR2974909B1 (en) * | 2011-05-02 | 2013-05-31 | Chauvin Arnoux | GALVANIC INSULATION DEVICE |
| CN113746317B (en) * | 2020-05-29 | 2023-09-22 | 北京机械设备研究所 | DC/DC switching power supply input active differential mode filtering device and filtering method |
| CN112558462B (en) * | 2020-12-03 | 2023-07-07 | 重庆交通大学 | Active series correction circuit and method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1634676A (en) * | 2005-01-13 | 2005-07-06 | 上海交通大学 | Full-digital speed change control method for wire feeding for submerged arc welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1634676A (en) * | 2005-01-13 | 2005-07-06 | 上海交通大学 | Full-digital speed change control method for wire feeding for submerged arc welding |
Non-Patent Citations (2)
| Title |
|---|
| 崔海安.电流型控制技术在开关电源中的应用.雷达与对抗 3.1997,(3),正文第39-45页. |
| 崔海安.电流型控制技术在开关电源中的应用.雷达与对抗 3.1997,(3),正文第39-45页. * |
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Inventor after: Li Xigong Inventor after: Lu Zhenyang Inventor after: Li Ximing Inventor after: Qin Li Inventor after: Guo Lijuan Inventor before: Li Xigong Inventor before: Lu Zhenyang Inventor before: Li Ximing Inventor before: Qin Li Inventor before: Guo Lijuan |
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