94results about How to "Increase control bandwidth" patented technology

A regulated power supply having power factor correction control includes a multi-vector error amplifier. The multi-vector error amplifier provides an error signal that is used to regulate a switching mechanism of the power supply. The multi-vector error amplifier acts to provide a low distortion error signal during steady-state operation, while responding rapidly and smoothly to sudden load changes.

In a multi-phase power converter using a phase-locked loop (PLL) arrangement for interleaving of pulse frequency modulated (PFM) pulses of the respective phases, improved transient response, improved stability of high bandwidth output voltage feedback loop, guaranteed stability of the PLL loop and avoidance of jittering and phase cancellation issues are achieved by anchoring the bandwidth at the frequency of peak phase margin. This methodology is applicable to multi-phase power conveners of any number of phases and any known or foreseeable topology for individual phases and is not only applicable to power converters operating under constant on-time control, but is extendable to ramp pulse modulation (RPM) control and hysteresis control. Interleaving of pulses from all phases is simplified through use of phase managers with a reduced number of PLLS using hybrid interleaving arrangements that do not exhibit jittering even when ripple is completely canceled.

The invention provides a distributed self-adaptive optical system based on optical fibers. The distributed self-adaptive optical system based on the optical fibers comprises an emitting laser, an optical fiber beam splitter, an optical fiber phase modulator, an optical fiber laser amplifier, a photoelectric detector, a three-port optical fiber circulator, a self-adaptive optical fiber collimator and coupler array, an integrated device, a multi-channel high-voltage amplifier, a wavefront controller as well as a beacon light source, a spectroscope and a far field target. The distributed self-adaptive optical system is based on the fiber laser technology in combination with a plurality of optical fiber devices, and is characterized in that a beacon light beam is divided by use of the self-adaptive optical fiber collimator and coupler array, the wavefront error of beacon light is measured in real time and the error is decomposed to each light sub-beam in a laser array, a piston for emitting the light sub-beams and a tilting phase are controlled independently and in parallel according to the principle of phase conjugation, and the influence of atmospheric turbulence effect on the quality of the light beam at the far field target is relieved. The distributed self-adaptive optical system based on the optical fibers has important application prospects in the fields such as laser atmospheric transmission, free space laser communication and laser radar.

The invention provides a compound axis tracking system based on a rotary biprism. The system can be used for tracking a fast-moving target with high precision. The device comprises a rotary biprism tracking control device, an imaging assembly, a fast reflecting mirror tracking device and a detector. According to the system, the rotary biprism is controlled to quickly track the moving target, namely, the target enters the image assembly and then is imaged to the detector, a fast reflecting mirror is controlled to deflect according to the miss distance of the target on the detector in order to stably close the target in a detection center, and as a result, high-precision tracking of the fast-moving target can be realized.

The invention relates to a control system and control method for a CMG (Control Moment Gyro) framework permanent magnet synchronous motor, and specifically relates to a control system and control method for precision of the rotating speed and bandwidth of a CMG framework permanent magnet synchronous motor, being suitable for various high performance servo systems, including a CMG framework system, based on a permanent magnet synchronous motor. By means of combination of sliding-mode control with a rotor field orientation vector control method, the control method for a CMG framework permanent magnet synchronous motor can improve the inhibiting ability of the system on the non-linear low frequency interference moment introduced by gyro moment, rotor static unbalance and other factors, and can improve the framework rotating speed control performance and the robustness of the system.

The present invention relates to precision linewidth control and frequency measurements of continuous wave lasers for the near to far IR spectral regions, precision frequency synthesizers and exemplary applications in molecular detection. Methods and systems are disclosed for simultaneous line narrowing of cw lasers, as well as referencing the desired emission wavelength to a frequency comb laser.

The invention discloses a delayless control method of rotor current of a grid-connection, speed-change and constant-frequency double-fed induction wind driven generator (DFIG). The conversion of a rotational coordinate is carried out by collecting three-phase rotor current signals, the feedback quantity of rotor current in a corotation synchronous-speed rotating coordinate system is obtained and is compared with a rotor current command in the same coordinate system, an error signal is inputted into a proportional-integral-complex coefficient resonance regulator for regulation, and the rotor reference voltage in the corotation synchronous-speed rotating coordinate system is obtained after feedback compensation decoupling and then converted into the rotor reference voltage used for space vector pulse width modulation (SVPWM) in the rotor coordinate system to generate a switching signal of a power device of a rotor side convertor so that DFIG grid-connected operation can be controlled. The method does not need to carry out positive and negative sequence decomposition of rotor current under balanced or unbalanced grid voltage, can not introduce decomposition time delay and can realize the reinforced control target of a power generation system under the unbalanced grid voltage, thereby effectively increasing the ride-through (uninterrupted) operation capability of a wind power system under power grid failure.

The invention discloses a nondelay control method for the current of the rotor of the variable speed constant frequency double feed nonsynchronous aerogenerator(DFIG). The transformation of coordinates of static three phase/two phase of the rotational coordinate is finished by collecting three phase rotor current signal so as to obtain the rotor current feedback amount in the static frame of axes to compare with the rotor current command in the stator static frame of axes, the difference signal is input into the proportion-resonance regulator for comparison, the rotor voltage reference value in the stator static fame of axes is obtained after feedback compensation decoupling. The rotor voltage reference value is then transformed into reference signals for space vector pulse width regulation in the rotor frame axes to generate switch signals of the power components of the converter of the rotor to control the synchronize and close operation of the generator. The invention is needless of the break down of the positive and negative sequence of current of the EFIG rotor no matter the electric net voltage is balance or not without introducing break down delay. The invention can realize strengthened control of the generating system in imbalanced electric net, effectively improve non-stop operation of the aerogenerator.

The invention discloses a power supply system, which comprises a digital power supply manager and a plurality of power supply modules, wherein each supply power module is used for supplying power to a corresponding load, and comprises a power supply part of a non-isolated DC/DC (Direct Current-Direct Current) converter, a signal sampling and converting circuit for providing analog voltage signals for representing output voltage, output current, temperature and the like, and a driving circuit for receiving a pulse-width modulation (PWM) signal and driving a switching device; a closed loop voltage control and protection function of each power supply module is integrated into a digital power supply; the digital power supply manager comprises a nonvolatile memory containing a register; the register comprises a digital power supply manager configuration register, a power supply module setting register, a power supply module monitoring register and a user customizing space; and the digital power supply manager is used for compiling and monitoring the operation of each power supply module, and can further comprise a user interface such as an I2C interface for receiving programmable data from a host user system and transmitting monitoring data.

The invention discloses a method for controlling rotor current of an AC excitation asynchronous doubly-fed induction generator (DFIG) without time delay. The method comprises acquiring a three-phase rotor current signal to perform rotational coordinate conversion to obtain rotor current feedback quantity in a positive rotation synchronous rotating coordinate system, compared with the rotor current command in the same coordinate system, inputting the error signal to a proportion-integral regulator for regulation, performing feedback compensation and decoupling to obtain rotor reference voltage in the positive rotation synchronous rotating coordinate system, converting to the rotor reference voltage for space vector pulse width modulation in a rotor coordinate system, and generating a switching signal for power devices of a rotor side transformer to control on-line operation of DFIG . The inventive method does not require performing positive and negative sequence decomposition of rotor current neither under balanced network voltage nor under imbalanced network voltage, and does not cause decomposition delay, so as to realize enhanced control target of the power generation system under imbalanced network voltage and effectively improve the uninterrupted operation (passing through) ability of the power generation system under network failure.

The invention discloses a compound control method and system based on a plug-in type rapid repetitive controller. The compound control method comprises: a repetitive controller internal module is formed by a positive feedback path and a repetitive control gain module, an internal model low-pass filter, a compensator module, and a feedforward gain channel are designed in the repetitive controller to form a new plug-in type rapid repetitive controller; and the output of the plug-in type rapid repetitive controller controls a controlled object by the input of the feedback controller, so that error-free tracking of a reference signal or elimination of all harmonics is realized. According to the invention, on the premise that stability of the controlled object is guaranteed by the feedback controller, the introduced feedforward gain module and the traditional repetitive controller are connected in parallel to form a novel plug-in type rapid repetitive controller that is capable of carrying out error-free tracking or elimination of all harmonics; and a defect of a slow dynamic response of the traditional repetitive controller can be overcome and the dynamic response speed of the whole controller is improved.

The invention provides a method for providing given frequency in a motor starting phase. The method is characterized by at least comprising a beginning phase and an ending phase in the starting process of the motor; in the beginning phase, the given frequency is provided at continuously-increasing acceleration, the given frequency and the acceleration of the given frequency are zero at the beginning of the beginning phase; in the ending phase, the given frequency is provided at the continuously-decreased acceleration; and the given frequency is increased to target frequency and the acceleration of the given frequency is decreased to zero in the end of the ending phase. In the invention, the starting phase of the motor is divided into the beginning phase and the ending phase, the accelerations of the given frequency are zero when the beginning phase is started and the ending phase is ended, the problem that an electric fence generates the impact by using the traditional linear acceleration method due to the mutation of the acceleration can be solved, the smooth starting of the motor can be realized, the starting current can be reduced, the starting overcurrent tripping can be avoided and thereby the performance of the motor can be fully exerted.

The invention provides a holographic grating exposure method adopting heterodyne interference fringe locking control, belonging to the field of spectrum techniques. The existing holographic grating exposure method realized by adopting a linear array CCD (Charge Coupled Device) in the prior art has the problem that high-frequency fringe jitter inhibition effect is poor due to a reason that the response speed of the linear array CCD is slow. A set of holographic grating exposure device and a set of heterodyne interference fringe locking control device are equipped. Interference fringes are locked in real time and are placed on a grating substrate for exposure. The method provided by the invention has the advantages that the interference fringes can be locked at a certain fixed value relative to the phase of the grating substrate during exposure of a holographic grating; since the control bandwidth is larger, the high-frequency fringe jitter can be better inhibited, the contrast of the groove profile of the holographic grating is guaranteed and the manufacturing process level of the holographic grating is improved.

The invention discloses an analog control circuit capable of enlarging the control bandwidth of a fast steering mirror, and is suitable for the large bandwidth control of the fast steering mirror in a photoelectric composite shaft tracking system. The circuit comprises an analog signal interface circuit (1), a control algorithm circuit (2), an analog compensation circuit (3), a subtractor (4), a fast steering mirror system (5), a differentiating circuit (6), and a detection element (7). An output signal of the fast steering mirror system (5) passes through the differentiating circuit (6), and then is fed back to an input end of the fast steering mirror system (5), thereby achieving the adjustment of frequency response of the fast steering mirror. The analog compensation circuit (3) achieves the frequency compensation of an adjusted fast steering mirror system. The control algorithm circuit (2) enables an input signal to be converted into an analog control signal with a control strategy, thereby achieving the control of the compensated fast steering mirror system. The circuit can achieve the real-time compensation of the structure resonance of the fast steering mirror, improves the frequency response of the fast steering mirror, and achieves a simple control algorithm.

A credit loop that produces a deadlock is identified in a network of switches that are interconnected for packet traffic flows therethrough. The identification is carried out by periodically transmitting respective credit loop control messages from the loop-participating switches via their deadlock-suspected egress ports to respective next-hop switches. The CLCMs has switch port-unique identifiers (SPUIDs). The loop is identified when in one of the next-hop switches the SPUID of a received CLCM is equal to the SPUID of a transmitted CLCM thereof. A master switch is selected for resolving the deadlock.

The invention discloses a fractional-phase-lead-compensation repetitive controller and a control method thereof. The controller is composed of a repetitive control gain module, a positive feedback gain module, an additive loop, an internal model constant module or an internal model low-pass filter, an internal model time-delay module, a fractional phase lead compensation module, and a compensator module. The method is characterized in that a repetitive controller internal module is formed by a positive feedback path and the repetitive control gain module, the internal model low-pass filter, the fractional phase lead compensation module, and the compensator module are designed in the repetitive controller to realize error-free tracking of a reference signal or eliminate harmonics. According to the invention, because the introduced fractional phase lead compensation link enables the beat number of phase lead compensation to be extended to a fraction from the traditional integer, the gain selection range of the repetitive controller is expanded, the error convergence speed is accelerated, the stability and anti-interference capability of the system with the low-sampling frequency are improved, error-free tracking or elimination of all harmonics can be realized; and flexibility of the design of other parameters of the repetitive controller is enhanced.

The invention relates to an optical phase-locked loop device based on a direct digital frequency synthesizer and a phase-locking method. The device is composed of a 90-degree optical bridge unit, a balanced detector, a mixer, a programmable logic gate array, a digital-to-analog converter, an analog-to-digital converter, a direct digital synthesizer, a band-pass microwave amplifier, a narrow-line-width tunable laser device, an optical intensity modulator, a fiber grating filter, a fiber beam splitter, and a fiber amplifier. The software uses linear frequency sweeping and Fourier transform to realize the initial entry of the phase-locked loop. With a PID algorithm, precise phase control of the optical phase-locked loop is realized. The device is able to realize high-precision phase locking and large-range frequency shift compensation of the optical phase-locked loop without an auxiliary phase-locked capture circuit. The DDS is used for replacing a voltage-controlled oscillator to realizedirect conversion from the voltage to the phase; and the loop phase margin is improved, the control bandwidth is enhanced, and thus the phase-locked performance of the optical phase-locked loop is improved. Therefore, the optical phase locking and laser coherent communication signal demodulation are realized quickly.

The invention provides a phase control method used for large array element coherent combination. The phase control method is characterized in that a modulation signal of a phase control algorithm is subjected to orthogonal coding and single-frequency modulation; compared with a multi-dithering algorithm, debugging signals with a plurality of frequencies are not needed, so that the algorithm is simplified and hardware is convenient to realize; compared with a single-dithering algorithm, the quantity of paths subjected to phase debugging within a certain time period is increased and the control bandwidth is improved. The invention further provides a phase control circuit used for the large array element coherent combination; the phase control circuit comprises a programmable chip 1, a digital to analog converter 3, a control signal conditioning circuit 4, an analog to digital converter 5 and an input signal conditioning circuit 6, and is characterized by further comprising a multiplexer 2. Under the condition that the number of output pins of the programmable chip 1 is limited, the maximum control path quantity of a control circuit is improved, and phase control of a hundred-path-level large array element coherent combination system can be realized.

The present invention is one kind of DC-to-AC voltage conversion circuit and its control method. The DC-to-AC voltage conversion circuit is connected to a DC voltage source and used to convert the DCvoltage into stable output AC voltage. It includes mainly one power level transistor switch, one LC filter, one current sensor, one voltage feedback ctrl, one load current sensor, one pulse width modulator and one current command compensator. The present invention aims at utilizing the current sensor to feed back the inductive current of the LC filter for stabilizing voltage and utilizing the load current sensor to widen the controlled frequency band width and raise the voltage stabilizing precision so as to provide stable output AC voltage.

The invention discloses an improved control method and system of a photovoltaic inverter Boost circuit. The control method of the photovoltaic inverter Boost circuit includes the following steps of obtaining a photovoltaic array voltage feedback signal vpvfb, a direct current bus voltage feedback signal vbusfb and an inductive current feedback signal iLfb; obtaining a voltage error signal the value of which is equal to a photovoltaic array voltage reference value vpvref minus the value of the voltage feedback signal vpvfb, making the voltage error signal passes through a voltage loop adjusterGvc to obtain an inductive current reference signal iLref, and substituting the inductive current reference signal iLref and the inductive current feedback signal iLfb into a current loop adjuster Gicto obtain a regulating signal vc1; substituting the voltage feedback signal vpvfb, the direct current bus voltage feedback signal vbusfb and a modulating signal vm of a last switching period into a feedforward adjuster Gff for processing to obtain a regulating signal vc2; adding the regulating signals vc1 and vc2 to obtain a new modulating signal vm, and sending the signal vm into a PWM generatorto generate a PWM driving signal of a Boost switching pipe.

The invention discloses a plug-in type rapid repetitive controller and a control method. The controller is composed of a feedforward gain module, a repetitive control gain module, a positive feedback gain module, two additive loops, an internal model constant module or an internal model low-pass filter, an internal model time-delay module, and a compensator module. The method is characterized in that a repetitive controller internal module is formed by a positive feedback path and the repetitive control gain module, the an internal model low-pass filter, the compensator module, and a feedforward gain channel are designed in the repetitive controller to form a new plug-in type rapid repetitive controller, thereby realizing error-free tracking of a reference signal or eliminating harmonic. According to the invention, the introduced feedforward gain module and the traditional repetitive controller are connected in parallel to form a novel plug-in type rapid repetitive controller that is capable of carrying out error-free tracking or elimination of all harmonics; and a defect of a slow dynamic response of the traditional repetitive controller can be overcome and the dynamic response speed of the whole controller is improved.

The invention relates to a micro electromechanical device (1') for tilting a body (2) in two degrees of freedom comprising a carrier element (3) and a membrane (4), the body (2) being connected via the membrane (4) to the carrier element (3), wherein the body (2) and the carrier element (3) each comprise at least one electrode (5,6). The body (2) is tilted by means of electrostatic forces (7) between the at least one electrode (5) of the body (2) and the at least one electrode (6) of the carrier element (3) by an application of a voltage (V1,V2) to said electrodes (5,6) from a voltage source.

The present invention discloses a high-power power grid simulator topological structure applied to an MW grade. The high-power power grid simulator of MW grade is decomposed into a fundamental wave generation module and a harmonic wave generation module set which are connected in series. The harmonic wave generation module set is formed by a plurality of harmonic wave generation module units, the fundamental wave generation module employs MW grade three-phase PWM inverter with high-power and low switching frequency to realize high-power requirement of high-power power grid simulator, and the harmonic wave generation modules employ a plurality of three-phase PWM inverters with low-power and high switching frequency to improve the control bandwidth of the high-power power grid simulator. The high-power power grid simulator topological structure applied to the MW grade is taken as a power grid voltage generation device in a distributed generation grid-connected research so as to solve the problem that the MW grade high-power power grid simulator is narrow in control bandwidth, provide required power grid environment for the distributed generation grid-connected research and satisfy the research demand.