30results about How to "High gain output" patented technology

The invention discloses an inductance regulating switch capacitor-type passive clamping soft switching high-gain boost-type converter which comprises a power switch tube, a clamping diode, a rectification diode, a coupling inductor and a regulating inductor and has the following basic functions: the zero-current turning-on of the power switch tube is realized through utilizing the leakage inductance of coupling inductance; the soft turning-off of the power switch tube and lossless transfer of leakage inductance energy are realized through the passive clamping circuit consisting of the clamping diode and a clamping capacitor; the high-gain output of the converter is realized through utilizing a second winding of the coupling inductor and the switch capacitor; the turn ratio of the coupling inductance is prevented from being over-high by utilizing the inductance to regulate and output voltage range; the volume of a magnetic element is reduced by utilizing the bidirectional operation of the magnetic element; the converter is simple in structure, is convenient to control; and loss energy elements are not arranged in the circuit, and the efficiency can be improved. The inductance regulating switch capacitor-type passive clamping soft switching high-gain boost-type converter provided by the invention is mainly applied to the field of renewable energy source and novel energy source power generation with low working voltage level, such as photovoltaic power generation and fuel battery power generation.

An active clamping high-gain alternate parallel voltage boosting convertor disclosed by the invention comprises two power switching diodes, two output diodes, two clamping diodes, two auxiliary power switching diodes, two clamping capacitors, two switching capacitors, an output capacitor and two coupling inductors. Two coupling inductors respectively comprise two windings. The present invention uses the second winding of two coupling inductors and two switching capacitors to realize the high-gain output of the convertor. With the leakage inductance of two coupling inductors, two clamping capacitors, the shunt capacitor existing in two power switching diodes themselves and the gate arrangement of two power switching diodes and two auxiliary power switching diodes, the zero voltage switching-on and zero voltage switching-off of two power switching diodes and two clamping diodes are realized. The soft switching-off of two output diodes and two clamping diodes are realized with the leakage inductance of two coupling inductors, and the circuit does not include energy losing element and the output gain of the convertor and the circuit efficiency can be increased.

The invention provides a parallel type quasi-proportional resonance active power filter and a control method thereof, for tracking a line frequency more accurately, solving the problem that floating track to alternating quantity by PI track cannot be achieved, and thus improving the filter performance of the active power filter. The control method of the parallel type quasi-proportional resonance active power filter comprises the following steps: 1, enabling obtained power grid voltage signals to be subjected to software phase-locked loop to real-time monitor the frequency of the power grid, and thus obtaining a phase angle of A phase positive sequence voltage; 2, real-time modifying resonance angular frequency being subjected to the control of quasi-proportional resonance, so as to enable the resonance angular frequency of the quasi-proportional resonance to always keep fixed proportional relation with the power grid frequency; 3, according to a real-time modified resonance angular frequency and an obtained load current signal, performing quasi-proportional resonance control to take out the reference current of a selected filtering frequency; 4, performing quasi-proportional resonance control to difference of the output reference current and actual output current of the active power filter, outputting a drive signal to drive the connection of IGBT (Insulated Gate Bipolar Transistor).

The invention discloses a quasi proportional resonance control method and control system for a parallel active power filter. A quasi proportional resonance controller is used for monitoring the voltage frequency of a power grid in real time by a phase-locked loop; when the voltage frequency of the power grid fluctuates, a value of parameter omega h in the controller is corrected in real time to be matched with the fluctuation of the frequency of the power grid; and the resonance frequency is always kept to be integral times the actual frequency of the power grid. Therefore, the control system can always maintain the maximum grain output and ensure the optimal control effect.

The invention discloses a single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation. The converter comprises a single-phase Booster circuit unit working in an input current continuous mode, a transformer voltage doubling circuit unit and an output circuit unit which are connected in turn, wherein the single-phase Booster circuit unit working in the input current continuous mode consists of an input filtering inductor, two power switching tubes, a parallel capacitor and a clamping capacitor; the transformer voltage doubling circuit unit consists of a transformer provided with two windings, a blocking capacitor, a voltage doubling capacitor and a freewheel diode; the output circuit unit consists of an output diode and an output capacitor; and an output circuit is connected with a load. The converter has the advantages of realizing zero voltage switch-on and switch-off of a first power switching tube and a second power switching tube, and reducing input current ripple along with simple circuit structure, convenient control and suitability for high efficiency conversion occasions of solar energy distributed power generation.

Two bias circuits which supply a current to a selected memory cell and a reference memory cell have the same circuit constitution. Each bias circuit includes a first active element between a power supply node and a junction node, where a current is controlled to prevent a voltage level at the junction node from fluctuating, a second active element between the power supply node and an output node, where a current is controlled such that a voltage level at the output node is changed in direction opposite to a voltage level at the junction node in other bias circuit, a third active element and a fourth active element between the junction node and a current supply node and between the output node and the current supply node, respectively, where a bias voltage is adjusted.

The invention discloses a dynamic expansion method applied to a CMOS image sensor, and the CMOS image sensor employs a double-gain pixel circuit, and enables the double-gain pixel circuit to be in a high-gain mode through a pixel control time sequence. The CMOS image sensor carries out exposure in an internal exposure mode, after preset exposure time is reached, exposure is finished, a pixel signal is read, and then the number of saturated pixels in a frame and the maximum unsaturated voltage value are counted; and the exposure time of the next frame is determined according to the number of the saturated pixels or the maximum unsaturated voltage amplitude, and a corresponding control time sequence is generated to start exposure of the next frame. According to the invention, pixel sequential control and internal exposure control are combined, so that the imaging effect in a low-light environment is good; high-gain output of pixels is maintained, and the detection sensitivity is improved; the dynamic range of image signals is improved, and automatic adjustment of exposure time is realized through internal exposure time control.

The present invention belongs to the field of active optical amplifier device in optical communication technology, and is especially one kind of Er doped or Er and Yb doped aluminan optical waveguide amplifier and its preparation process. The present invention features that the optical waveguide amplifier is prepared through MF plasma magnetically controlled sputtering to prepare Er doped or Er and Yb doped alumina film; annealing of the prepared film; and mask etching process including five steps of depositing SiO2 layer on the film, painting photoresist, ultraviolet irradiating to decomposing SiO2 under mask to form etching pattern, etching the substrate in plasman and eliminating photoresist. The present invention may be used for the compensating amplification of optical signal in optical communication to serve as repeater.

The invention provides a terminal STATCOM output current control method for suppressing torsional vibration. The method comprises a power frequency current compensation calculation link, a semaphore measurement link, a modal current compensation calculation link, a current control inner loop link, a DC voltage control outer loop link and a pulse generation link. Firstly a power frequency current compensation value, a modal control value and a DC current compensation value are calculated, then the three values are processed by the PIR controller of the current control inner loop link and then amodulated wave voltage reference value is obtained, and finally the trigger pulse is generated through the pulse generation module to control on/off of IGBT in STATCOM and generate the required sub-synchronous/super-synchronous current to be injected into the stator winding of the generator to generate the electromagnetic torque for suppressing the torsional vibration. The invention also correspondingly provides a terminal STATCOM controller for suppressing the torsional vibration. According to the scheme, the STATCOM is enabled to participate in the power frequency fundamental reactive current regulation, and the characteristics of the original PR controller and the torsional vibration suppression effect can be improved and implementation is easy.

The invention relates to a novel optical storage integrated DC converter, and belongs to the technical field of DC/DC converters. Comprising a photovoltaic input unit, a storage battery input unit and a boosting unit, the photovoltaic input unit comprises an inductor L1, a capacitor C1, a power switch S1, a power switch S2 and a diode D1, the storage battery input unit comprises a storage battery Ubat, an inductor L2, a capacitor C2 and a power switch S3, and the boosting unit comprises an inductor L3, a capacitor C3, a capacitor C4, a diode D2 and a diode D3; the DC/DC converter solves the problems of electric energy waste, low electric energy utilization rate and the like of a DC/DC converter in the prior art.

A three-port high-reliability sepic DC-DC converter comprises an input unit, a first boosting unit, a second boosting unit and a load unit which are sequentially connected, wherein the input unit comprises inductors L1, L2, L3, L4 and L5, capacitors C1, C2, C3, C4 and C5, power switches S1, S2 and S3 and diodes D1, D2, D3 and D4; the first boosting unit comprises an inductor L6, a capacitor C6, a capacitor C9 and a diode D6, and the second boosting unit comprises an inductor L7, a capacitor C7, a capacitor C8 and a diode D7. Compared with an existing scheme, the three-port high-reliability sepic DC-DC converter has the advantages that the electric energy conversion frequency among a micro power supply, a storage battery and a load can be remarkably reduced, the electric energy conversion efficiency is improved, the input and output voltage regulation range is wide, the voltage stress of a switching device is low and the like, and 2N paths of boost expansion can be realized.

The invention provides a high-gain energy injection-type push-pull topological structure of an IPT system, a control system and a control method. The IPT system comprises a primary circuit and a secondary circuit, wherein at least one switch tube is also connected to the primary circuit in series, so that on and off of an inverter circuit and a resonant network are achieved through regulating switch-on and switch-off of the switch tube. The at least one switch tube is also connected to the primary circuit in series, and on or off of inverter bridge switch tubes S1 and S2 is controlled through regulating conduction cycles of the switch tubes, so that energy injection of the system is controlled, high-gain output is achieved, the regulating ranges of input gain and output gain are improved and a constant-voltage regulation function is achieved.

The invention discloses a method and a system for improving the performance of a Raman optical fiber amplifier. The method comprises the following steps: obtaining the first pump light power and the first optical fiber length of a first Raman optical fiber amplifier; constructing a Raman fiber amplifier gain prediction model; constructing a Raman fiber amplifier gain flatness prediction model; inputting the first pump light power and the first optical fiber length into a Raman optical fiber amplifier gain prediction model to obtain a first prediction gain; inputting the first pump light power and the first optical fiber length into a Raman optical fiber amplifier gain flatness prediction model to obtain first prediction gain flatness; determining a first gain relationship; and obtaining first adjustment information, and performing parameter adjustment on the first Raman optical fiber amplifier. The technical problem that the Raman optical fiber amplifier cannot be intelligently adjusted based on the relationship between the gain size and the gain flatness of the Raman optical fiber amplifier in the prior art is solved.