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

The invention discloses a forward-flyback isolated type boost inverter realized by coupling inductors and application thereof, comprising two power switch tubes, two auxiliary switch tubes, four anti-parallel diodes, a switch tube parallel capacitor, two clamp capacitors, two switch capacitors, two output diodes and two coupling inductors respectively provided with two windings. The invention realizes zero-voltage switching on of the power switch tubes through the resonance of the leakage inductance of the two coupling inductors and the switch tube parallel capacitor, absorbs the voltage peakswitched off by the switch tubes caused by the leakage inductance and realizes energy lossless transfer by utilizing a clamp circuit comprising the anti-parallel diodes of the switch tubes and the two clamp capacitors, realizes the high gain output of the inverter by utilizing the serial connection of the second windings of the two coupling inductors, further improves the gain of the inverter andlowers the output voltage stress of the diodes by utilizing the switch capacitors and realizes the output zero-current switching off of the diodes by utilizing the leakage inductance of the coupling inductors.

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 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.

A zero-voltage switch high-gain DC-DC converter with switched capacitors relates to DC-DC conversion. Including power supply, power switching tube, power inductor, switching capacitor, clamping diode, freewheeling diode, output diode and output capacitor; one end of the first power inductor is connected to the positive pole of the power supply, the anode of the first clamping diode and the anode of the third clamping diode The other end of the first power inductor is connected to the anode of the second clamping diode and one end of the first switch capacitor; the other end of the first switch capacitor is connected to the cathode of the first clamping diode and one end of the second power inductor, and the other end of the second power inductor It is connected to the cathode of the second clamping diode, the drain of the power switch tube and one end of the second switching capacitor; the other end of the second switching capacitor is connected to the cathode of the third clamping diode, the cathode of the freewheeling diode and the anode of the output diode; the cathode of the output diode is connected to the One end of the output capacitor is connected, and the other end of the output capacitor is connected together with the negative pole of the power supply and the source pole of the power switch tube.

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).

A method for controlling the output current of a machine terminal STATCOM for suppressing torsional vibration, comprising a power frequency current compensation calculation link, a signal quantity 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 ; First calculate the power frequency current compensation value, modal control value, and DC current compensation value, then pass the three through the PIR controller of the current control inner loop to obtain the reference value of the modulated wave voltage, and finally generate the trigger pulse through the pulse generation module to control the STATCOM The on-off of the IGBT generates the required sub-synchronous / super-synchronous current, which is injected into the stator winding of the generator to generate an electromagnetic torque that suppresses torsional vibration. The invention also correspondingly provides a machine-end STATCOM controller for suppressing torsional vibration. This scheme makes STATCOM not only participate in the power frequency fundamental wave reactive current regulation, but also improves the characteristics of the original PR controller and the torsional vibration suppression effect, which is easy to implement.

The invention provides a high-gain boosting type direct-current converter, comprising two inductors, two power switches, two output diodes and a voltage-multiplying unit, wherein input ends of the first inductor and the second inductor are connected with an anode of an input power supply; output ends of the first inductor and the second inductor are connected with drain electrodes of the first power switch and the second power switch; source electrodes of the first power switch and the second power switch are connected with a cathode of the input power supply; grid electrodes of the two power switches are respectively connected with respective controllers; a phase difference between driving phases of the two power switches is 180 degrees, namely an interleaving control policy is adopted; and one time of basic gain is improved on the basis of the gain of the previous circuit by additionally arranging one voltage-multiplying unit in the circuit. Compared with the existing high-gain boosting type direct-current converter, the high-gain boosting type direct-current converter has the advantages that the circuit topology is simple and the coupling inductance does not exist (EMI (Electro-Magnetic Interference) is small); and voltage stress of a switching element can be greatly reduced and the whole working efficiency of the converter is improved.

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 present invention provides an automatic current-sharing high-degree-of-freedom DC-CD converter. Compared to a current converter, the number of input phases and the number of gain units are adjustable, the automatic current sharing can be realized after the number of input phases and the number of gain units are changed, and control of lots of sensors and the complex control strategy design are omitted. When the automatic current-sharing high-degree-of-freedom DC-CD converter is applied to different occasions, the number of input phases and the number of gain units can be flexibly regulated, several times of gain are improved through adding one input phase or one gain unit, the ratio of the output voltage and the input voltage is m*n, wherein D is a duty ratio, and m and n are the number of input phases and the number of gain units. The automatic current-sharing high-degree-of-freedom DC-CD converter can satisfy large-scale, high-power and high-gain occasions. Compared to the current high-gain technology, the automatic current-sharing high-degree-of-freedom DC-CD converter has no a coupling inductor or an isolation transformer, and the current stress and the voltage stress of a switch and a diode are reduced so as to improve the whole work efficiency of the converter.

A four-phase switch reluctance motor power converter is composed of eight switch tubes, four diodes, two capacitors, a storage battery, an inductor and an isolation bidirectional DC / DC. Every two adjacent windings in a main circuit form one group; when the main circuit completes magnetic excitation and power generation, the output voltage value can be increased; the magnetic excitation storage battery can be charged according to needs and meanwhile can feed energy backwards; one power converter is adopted when a motor runs; the power converter is simple in structure, convenient to control, lowin switch tube switching frequency, low in loss, high in flexibility and adaptability and suitable for various power generation / electric occasions.