CN1056713C - Phase-serve-modulating device for quick precision lock - Google Patents
Phase-serve-modulating device for quick precision lock Download PDFInfo
- Publication number
- CN1056713C CN1056713C CN96100963A CN96100963A CN1056713C CN 1056713 C CN1056713 C CN 1056713C CN 96100963 A CN96100963 A CN 96100963A CN 96100963 A CN96100963 A CN 96100963A CN 1056713 C CN1056713 C CN 1056713C
- Authority
- CN
- China
- Prior art keywords
- phase
- input
- vco
- servo
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The present invention relates to a phase-locking servo tuner, particularly to a fast and precise phase-locking servo tuner which is provided with a master phase detector whose output terminal is connected in series with a phase difference limiter, a D/A converter, an auxiliary quadrature phase detector for outputting coherent AGC control, and a speed feedback non-linear control servoamplifier. The present invention also adopts a servo mechanism in which a VCO tuning capacitor is in straight and synchronous connection with a servo motor and a tachometer. When in work, the VCO phase of a phase-locked loop voltage-controlled oscillator is fast locked, and the reference crystal oscillation phase is precisely and synchronously tracked. Therefore, the present invention is suitable to lock phase, stabilize frequency, improve efficacy and inhibit the radiation of interference frequency for ISM radio frequency apparatus used in high frequency heating in industrial and agricultural production, medical care, etc.
Description
The present invention relates to a kind of phase-locked servo tuner, particularly relate to a kind of phase-serve-modulating device for quick precision lock.
Industry high-frequency heating apparatus phase locking frequency stabilized is with phase frequency detector detection of error signals V
dVoltage-controlled servo-tuning heating oscillator VCO, application number 92104322.8 Chinese patents disclose the technology of this equipment.Existing phase frequency detector is a Digital Logical Circuits, and operating mode changes detection beat voltage V
d=V
DmOutput, voltage is maximum, forward and reverse step voltage High-speed Control VCO frequency is tuning to reducing the frequency difference direction, has very wide off-resonance frequency and catches tractive effort.But, when frequency difference enters the phase bit comparison near zero state, V
d→ 0, the output voltage trend is to zero, because phase discrimination signal porch triggering work, it is big to trigger noise.This noise is round the phase signal random fluctuation, and similar normal state distributes, and its pulsewidth and amplitude are uncertain.When loop tracks differs near φ=0 for a short time, because of being subjected to noise pollution, and because of the tuning inertia of frequency difference high speed, differ the zero-bit competition, detected signal errors is bigger, or the transmission of servo-tuning low speed is not steady, and its result influences the inhibition of VCO first-harmonic sideband interfering frequency radiation.Usually, it is quite short that workpiece adds the thermofussion welding time, duration only finishes in second in several seconds, power supply energy storage persistent wave is shorter heating time, require locking time fast, high accuracy steady track melting welding speed, yet, the noise that phase discriminator is introduced is superimposed upon on the phase potential difference, and loop filter does not have the ability of filtering to it.And loop filter is analog circuit, and integrating capacitor discharges and recharges lotus to square wave phase potential difference and can not respond rapidly, the voltage controlled frequency of VCO is difficult to accurately control proofreaies and correct.With the simple digital-to-analogue conversion of charge pump, additional noise is bigger.Because the servo electric tuning exists the unfavorable factors such as time-delay of gearing friction and inertia, Backlash Nonlinearity error, electro mechanic time constant all to influence stable state accuracy.Reduce loop gain, then influence lock speed etc., tuning being difficult to of single speed taken into account.These problems have nothing to do at electronic tuning, but voltage-controlled device is confined to low pressure small-power VCO work, and electromechanical servo tuning be not limited by oscillation source voltage, power.The linear tracking of existing simulation phase discriminator is low noise, but do not possess the frequency discrimination function, and operating mode changes just can't catch off-resonance frequency.
The present invention seeks to: improve phase-locked servo tuner wen-frequency characteristics, the phase place that makes voltage controlled oscillator VCO fast, high-precise synchronization follows the tracks of benchmark crystal oscillator phase place and a kind of phase-serve-modulating device for quick precision lock is provided.
The technology of the present invention solution is a termination benchmark crystal oscillator 13 reference signals in main phase discriminator 3 inputs, another termination voltage controlled oscillator VCO 1 output signal, its loop that exports to considers that serial connection differs limiter 4 between ripple device 6 inputs, D/A converter 5, loop filter 6 outputs insert servo amplifier 7, the input of auxiliary quadrature phase detector 9 is attempted by main phase discriminator 3 inputs, quadrature phase detector inserts servo AGC control end of going into big device 7 through smoothing filter 10, realize relevant automatic gain control, and in servo amplifier 7 introducing speed feedback control, servo-tuning mechanism adopts VCO tuning capacitor 2 and servomotor 8, tachometer 12 same arbor straight lines connect synchronously, servomotor 8 is connected on servo amplifier 7 outputs, the input of velocity feedback controller 11 connects tachometer 12, and output inserts servo amplifier 7, and VCO tuning capacitor 2 inserts the resonant groove path of voltage controlled oscillator VCO 1.
Based on above-mentioned technical solution is the restriction of taking phase difference signal shaping and pulsewidth, special-purpose digital to analog converter improves noise characteristic, and improve the loop filter transient response, auxiliary quadrature phase detector extracts the relevant AGC control loop gain tuning of leading main phase discriminator pi/2 phase potential difference, the double speed variable bandwidth improves lock speed and precision, introducing the damping of speed feedback Nonlinear Dynamic proofreaies and correct, the steady transmission of the non-rigid contact of servo linear motor is tuning, further improve Phase synchronization speed and steady-state tracking precision, make its voltage controlled oscillator VCO reach the radiation that higher standard requires to suppress fundamental frequency sideband interfering frequency, concentrate the base band energy.
Below in conjunction with drawings and Examples the present invention is described in detail.
Fig. 1 is a principle of the invention block diagram.
Fig. 2 is a servo-tuning structural scheme of mechanism of the present invention.
With reference to Fig. 1, a kind of phase-serve-modulating device for quick precision lock of Fig. 2, one termination benchmark crystal oscillator, 13 reference signals of main phase discriminator 3 inputs, another termination voltage controlled oscillator VCO 1 output signal, its output serial connection differs limiter 4, D/A converter 5 is to the input of loop filter 6, quadrature phase detector 9 inputs are connected to the input of main phase discriminator 3, the input of its output termination smoothing filter 10, the input of tachometer 12 output access speed feedback controllers 11, loop filter 6, the output of velocity feedback controller 11 all inserts the input of servo amplifier 7, smoothing filter 10 outputs connect the AGC control end of servo amplifier 7, the output of servo amplifier 7 connects servomotor 8, the moving plate pole plate of VCO tuning capacitor 2 places servomotor 8, on the axostylus axostyle of tachometer 12, and ground connection, the stator pole plate connects the resonant groove path of voltage controlled oscillator VCO 1.
At servo-tuning illustrated in fig. 2 mechanism servomotor 8, tachometer 12 is that same arbor directly is connected synchronously with VCO tuning capacitor 2, its the tubular iron core 14 of two end plates 16 inboard tandem arrangements, annular magnetic steel 19, annular pole shoe 18 constitutes servomotor 8, the magnetic circuit of tachometer 12, be placed in the coil rack 17 of tubular iron core 14 cylindricals and the piston 15 of interior circle, axostylus axostyle 20 is under the voltage control of main phase discriminator 3, servomotor 8 coil magnetic field power and annular magnetic steel 19 magnetic field forces interact, and do the tuning of straight-line displacement campaign between VCO tuning capacitor 2 moving plates that axostylus axostyle 20 the is put stator corresponding with it.The piston 15 that is connected with coil rack 17 is round along with being tuned as steadily transmission of non-rigid slip in tubular iron core 14.Tachometer 12 output voltages are directly proportional with servomotor 8 transmission speeds, for speed feedback control.Because the coaxial one of this servomechanism does not have under drive gear, thus the nonlinearity erron of no backlash, and dynamo-electric time-delay is little.
The limiter that differs of the present invention is to constitute by monostable pattern and shaping triggering work with RC integral form shaping gate circuit, the phase difference signal pulsewidth of main phase discriminator output is limited in by the given a certain steady state value of RC time constant, amplitude is shaped as the waveform of rule, suppresses irregular at random noise pulse interference of moment and enters D/A converter.Digital to analog converter is that the electronic switch by binary code counting controlling resistance network solves corresponding weight voltage, converts analog quantity to by the amplifier summation.At this moment, loop filter has good transient response to analog signal, satisfies two requirements, and the one, filtering characteristic, the 2nd, proofread and correct transient error.Velocity feedback controller is by amplifier input serial connection bi-directional voltage stabilizing diode, utilize this pipe Low ESR when tachometer output higher voltage punctures to strengthen the amplifier gain, rate signal is becomes the characteristic that the damping of resistance Nonlinear Dynamic is proofreaied and correct, improve servo-tuning not only fast but also the excessive vibration of non-overshoot amount.
The degeneration resistors of servo amplifier also connects field effect transistor, the drain electrode of its pipe is connected with resistor, source ground, grid are the input of AGC control, before phase locking, the poor phase voltage DC component of quadrature phase detector output is very little, the field effect transistor gate bias almost are zero, and the pipe output resistance is big, and the servo amplifier high-gain drives the tuning VCO of servomotor high speed, make its loop that enough wide bandwidth be arranged, acquisition phase is synchronous fast.When entering phase control, the phase difference signal of quadrature phase detector output is the pi/2 of the leading main phase discriminator output phase difference signal of phase shift, is added to servo amplifier AGC control end through smothing filtering, and the field effect transistor output resistance reduces.The main phase discriminator phase difference signal that feeds back to the servo amplifier input is strengthened, and the servo amplifier gain diminishes the tuning VCO of servomotor low speed.At this moment, loop bandwidth is narrow, has guaranteed the tracking steady-state behaviour.Quadrature phase detector and main phase discriminator differ 90 ° of relevant AGC controls, and time domain precision height is avoided the losing lock of tuning sudden change through smothing filtering.
In the time of phase capturing and tracking, speed feedback is proofreaied and correct the voltage control that obtains tachometer output opposite polarity, and the damping of servo linear motor inertia Nonlinear Dynamic has further improved the tuning dynamic accuracy of VCO.VCO tuning capacitor and servomotor, the synchronous servo-tuning mechanism that is connected of the same arbor straight line of tachometer, no backlash error, stable drive, reaction speed is fast.
The embodiment of the invention 1, one termination benchmark crystal oscillator, 13 reference signals of main phase discriminator 3 inputs, another termination voltage controlled oscillator VCO 1 output signal, its output serial connection differs limiter 4, D/A converter 5, loop filter 6 to servo amplifier 7 drives servomotor 8, auxiliary quadrature phase detector 9 inputs are attempted by the input of main phase discriminator 3, its output is connected to the AGC control end of servo amplifier 7 through smoothing filter 10, velocity feedback controller 11 inputs connect tachometer 12, output inserts servo amplifier 7, servo-tuning mechanism adopts VCO tuning capacitor 2, the structure that servomotor 8 and tachometer 12 same arbor straight lines connect synchronously, voltage controlled oscillator VCO 1 is the voltage-controlled heating oscillator of power output 2.5kw phase-locked high frequency hot press, the frequency 40.680MHz that the first-harmonic centre frequency adopts IEC/CISPR international standard regulation industry (ISM) radio-frequency apparatus to use allows frequency difference ± 0.05%.VOC tuning capacitor 2 inserts the resonant groove path of voltage-controlled heating oscillator VCO1.
The main and auxiliary phase discriminator of present embodiment adopts digital IC circuit, 8 D/A converters and control of relevant AGC automatic gain and speed feedback nonlinear Control.Any workpiece heating acquisition phase lock in time＜10ms, steady track is tuning steadily and be synchronized with workpiece melting welding speed, and the heat seal effect is improved.Survey voltage-controlled heating oscillator VCO work fundamental frequency, allow that frequency difference reaches the IEC international standard.
The embodiment of the invention 3, it is the heating oscillator of the phase-locked HF induction heating apparatus of power output 100kw level that technical scheme is removed voltage controlled oscillator VCO 1, operating frequency 3.150MHz, other parts are identical with embodiment 1.Electric metal is handled the quenching workpiece and frequently and is discontinuously worked, the phase place fast precise is synchronous, voltage-controlled heating oscillator VCO high power valve remains on the operating state of not off resonance, power output and stabilised efficiency are greatly improved, anode dissipation power does not increase because of the workpiece equivalent load impedance changes, and is fixed on optimum state all the time, therefore not only improves the equipment heating function, suppress the radiation of interfering frequency, also increase the service life.
The present invention is reasonable in design, advanced technology, precision height, cost is low, can be widely used in various ISM radio-frequency apparatus phase locking frequency stabilizeds such as thermoplastic materials moulding, phenolic moulding powder preheating, the drying of wood, furniture gummed, Seed Treatment, grain heat-drying, RF medical, medicine sterilization, the middle drying of silk dye transfer, plasma roasting quartz, metal heat treatmet and welding and improve performances.
Claims (5)
1, a kind of phase-serve-modulating device for quick precision lock, comprise benchmark crystal oscillator (13), voltage controlled oscillator VCO (1), main phase discriminator (3), loop filter (6), servo amplifier (7), servomotor (8), VCO tuning capacitor (2), it is characterized in that: differ limiter (4) in addition, D/A converter (5), quadrature phase detector (9), smoothing filter (10), tachometer (12), velocity feedback controller (11), one termination benchmark crystal oscillator (13) reference signal of wherein main phase discriminator (3) input, another termination voltage controlled oscillator VCO (1) output signal, its output to the input serial connection of loop filter (6) differs limiter (4), D/A converter (5), quadrature phase detector (9) input is connected to the input of main phase discriminator (3), and its output connects the input of smoothing filter (10), tachometer (12) output is connected on the input of velocity feedback controller (11), loop filter (6), the output of velocity feedback controller (11) all is connected to the input of servo amplifier (7), smoothing filter (10) output connects the AGC control end of servo amplifier (7), servo amplifier (7) output connects servomotor (8), VCO tuning capacitor (2) and servomotor (8), tachometer (12) constitutes the servo-tuning mechanism that same arbor straight line connects synchronously.
2, according to claims 1 described phase-serve-modulating device for quick precision lock, it is characterized in that: differing limiter (4) is to be made of RC integral form shaping gate circuit, and D/A converter (5) input is connected to binary counter, and its output connects amplifier.
3, according to claims 1 described phase-serve-modulating device for quick precision lock, it is characterized in that: the degeneration resistors of servo amplifier (7) also connects field effect transistor, and this pipe drain electrode is connected with its resistor, and source ground, grid are the input of AGC control.
4, according to claims 1 described phase-serve-modulating device for quick precision lock, it is characterized in that: it is by the tubular iron core of the inboard tandem arrangement of two end plates (16) (14) for a servo-tuning mechanism, and be nested with annular magnetic steel (19), annular pole shoe (18), the cylindrical of tubular iron core (14) is nested with coil rack (17), interior circle is provided with piston (15), and there is axostylus axostyle (20) to stretch out, coil rack (17), the moving plate pole plate (21) of VCO tuning capacitor (2) places on the axostylus axostyle (20), servomotor (8), the coil of tachometer (12) is respectively on coil rack (17), moving plate pole plate (21) ground connection of VCO tuning capacitor (2), stator pole plate (22) connects the resonant groove path of voltage controlled oscillator VCO (1).
5, according to claims 1 described phase-serve-modulating device for quick precision lock, it is characterized in that: velocity feedback controller (11) is the diode by amplifier input serial connection bi-directional voltage stabilizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96100963A CN1056713C (en) | 1996-01-18 | 1996-01-18 | Phase-serve-modulating device for quick precision lock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96100963A CN1056713C (en) | 1996-01-18 | 1996-01-18 | Phase-serve-modulating device for quick precision lock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1155188A CN1155188A (en) | 1997-07-23 |
| CN1056713C true CN1056713C (en) | 2000-09-20 |
Family
ID=5116841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96100963A Expired - Fee Related CN1056713C (en) | 1996-01-18 | 1996-01-18 | Phase-serve-modulating device for quick precision lock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1056713C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601187B (en) * | 2015-02-04 | 2017-07-04 | 上海航天测控通信研究所 | A kind of phase-locked receive of spaceborne automatic switchover gain |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4647873A (en) * | 1985-07-19 | 1987-03-03 | General Dynamics, Pomona Division | Adaptive linear FM sweep corrective system |
| US4758800A (en) * | 1987-04-02 | 1988-07-19 | Raytheon Company | Low noise magnetically tuned resonant circuit |
| CN1069223A (en) * | 1992-06-05 | 1993-02-24 | 兰溪市工艺制品厂 | Phase-locked high frequency hot press |
| US5343167A (en) * | 1993-02-03 | 1994-08-30 | Silicon Systems, Inc. | One-shot control circuit for tracking a voltage-controlled oscillator |
-
1996
- 1996-01-18 CN CN96100963A patent/CN1056713C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4647873A (en) * | 1985-07-19 | 1987-03-03 | General Dynamics, Pomona Division | Adaptive linear FM sweep corrective system |
| US4758800A (en) * | 1987-04-02 | 1988-07-19 | Raytheon Company | Low noise magnetically tuned resonant circuit |
| CN1069223A (en) * | 1992-06-05 | 1993-02-24 | 兰溪市工艺制品厂 | Phase-locked high frequency hot press |
| US5343167A (en) * | 1993-02-03 | 1994-08-30 | Silicon Systems, Inc. | One-shot control circuit for tracking a voltage-controlled oscillator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1155188A (en) | 1997-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7282897B2 (en) | Apparatus and method for transient control in a multiphase switching power supply | |
| DE69300601T2 (en) | Digital-analog control for brushless DC axial motor. | |
| US4835486A (en) | Isolation amplifier with precise timing of signals coupled across isolation barrier | |
| DE102006043878B4 (en) | Motor control circuit | |
| EP0334804B1 (en) | Resonant circuit with stabilized phase coupling | |
| Lin | Fuzzy adaptive model-following position control for ultrasonic motor | |
| US9880027B2 (en) | Resolver excitation apparatus | |
| US5450521A (en) | Pulse width modulator | |
| Namadmalan | Universal tuning system for series-resonant induction heating applications | |
| Rim et al. | A state space modeling of non-ideal DC-DC converters | |
| US4804900A (en) | Control apparatus for synchronous motors | |
| Lee et al. | A 580 kHz switching regulator using on-off control | |
| CN1056713C (en) | Phase-serve-modulating device for quick precision lock | |
| EP0401442A1 (en) | Apparatus for automatic control of power factor of inductive load | |
| Namgoong et al. | A 13.56 MHz wireless power transfer system with fully integrated PLL-based frequency-regulated reconfigurable duty control for implantable medical devices | |
| Jiang et al. | An accurate phase detection method for realizing ZVS of high frequency inverter in wireless power transmission | |
| DE69825214T2 (en) | Electronically commutated motor | |
| Chen et al. | A burst mode pulse density modulation scheme for inductive power transfer systems without communication modules | |
| CN1066392C (en) | Phase locking servo tuning device | |
| US4114075A (en) | Rotation control system | |
| EP1035642B2 (en) | Pulse width modulation for driving an inverter for AC motors | |
| CN113082502B (en) | Ultrasonic skin therapeutic instrument | |
| CN113934137A (en) | Ultrasonic power supply resonant frequency tracking method and system | |
| Jiang et al. | A novel synchronization technique for high frequency rectifier in wireless power transfer | |
| US4896255A (en) | Power pack comprising resonant converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |