40 results about "Active power decoupling" patented technology

The invention discloses a non-isolated grid-connected inverter with active power decoupling function, comprising: a first inductor, a second power switch, a first power switch, a first diode, a second diode, First decoupling capacitor, second inductor, fourth power switch, third power switch, third diode, fourth diode, second decoupling capacitor, first DC power supply, second DC power supply, filter Capacitor, third inductance, detection circuit, control circuit; the detection circuit is used to detect the first inductance current, the second inductance current, the AC voltage of the power grid, and the grid current, and feed back to the control circuit, and the control circuit will The feedback signal of the detection circuit is converted into a driving signal and sent to the first to fourth power switches. The non-isolated grid-connected inverter with active power decoupling function provided by the present invention has a simple structure, realizes the decoupling of ripple power, and avoids the use of a large-capacity input filter, and is small in size and low in cost. efficient.

The invention discloses an active power decoupling device and a control method without adding additional switching devices, which is realized by adding two additional energy storage capacitors in the topology of a conventional single-phase current-type converter. In each power frequency cycle, each energy storage capacitor works in turn to complete the absorption and release of the inherent secondary pulsating power in the single-phase current-source converter. Compared with conventional active decoupling devices, it does not need to add additional switching devices, which is beneficial to reduce system cost and improve system efficiency. The DC current in the active decoupling device is corrected in real time by the decoupling circuit, and the average value of the decoupling capacitor voltage is kept constant by the rectification stage circuit. The system control does not depend on precise system parameters, and has strong robustness; only a simple PI controller can realize fast and error-free tracking of the control target, and the controller design is easy.

The invention relates to the technical field of miniature single-phase photovoltaic grid-connected inverters, and specifically discloses a single-phase grid-connected inverter with active power decoupling function and a power decoupling control method thereof. converter, a single-phase two-leg inverter circuit, an AC low-pass output filter circuit, and an active power decoupling circuit, the active power decoupling circuit is embedded in the single-phase two-leg inverter circuit to form a three-leg inverter circuit; the DC input source of the inverter is connected to the input terminal of the buck-boost converter, an input filter capacitor is connected in parallel therebetween, and the output terminal of the buck-boost converter is connected to the three-leg inverter circuit The input end of the three-bridge arm inverter circuit is connected to the input end of the AC low-pass output filter circuit; the power decoupling control is performed by using a pulse width energy modulation method. The present invention can use non-electrolytic capacitors as decoupling capacitors, avoiding the use of electrolytic capacitors, thereby prolonging the fault interval time of the inverter and improving the reliability of the system.

The invention provides a three-port single-phase single-stage inverter which comprises an input port, a modulation port, a controller, a commutator and an active power decoupling circuit port. The input port receives and transmits input power of a direct-current power supply. The modulation port generates a full-wave rectified sine wave current based on the input power. The controller generates switch control signals, inverting switch control signals, first pulse width modulation control signals and second pulse width modulation control signals. The commutator converts the sine wave current into an alternating current according to the switch control signals and the inverting switch control signals, and outputs the alternating current to a load-bearing device or a city power grid. The modulation port executes corresponding actions according to the first pulse width modulation control signals, and the active power decoupling circuit port executes corresponding actions according to the second pulse width modulation control signals.

The invention discloses a power factor corrector with an active power decoupling function and a control method thereof, Based on the current topology of step-up power factor correction converter, a buffering circuit is added to control the AC side current waveform and DC side output voltage directly, and the power fluctuation of double power frequency is transferred to the buffering capacitor automatically. The control objectives of correcting power factor and stabilizing output voltage are realized. The requirement of the converter for capacitor device is effectively reduced and the electrolytic capacitor is replaced by thin film capacitor, so the power density, service life and reliability of the converter are improved. At the same time, the proposed converter is based on step-up topology, and the DC-side current of diode full-bridge rectifier is continuous. Compared with the converter based on step-down topology and step-up-buck topology, the proposed converter has the advantages oflower AC-side high-frequency harmonic components and simplified filter design.

The invention provides a three-port single-phase single-pole micro current converter comprising an input port, a modulating port, a phase converter and an active power decoupling circuit port, wherein the input port is coupled with a direct current power supply and is used for receiving and transmitting the input power of the direct current power supply, the modulating port is magnetically coupled with the input port and is used for generating and outputting a full-wave rectified string wave current according to the input power, the phase converter is coupled with the modulating port and is used for converting the string wave current into an alternating current according to a switch control signal and an inverse-phase switch control signal and outputting the alternating current to an electric supply, wherein the frequencies of the switch control signal and the inverse-phase switch control signal are same as the frequency of the electric supply; the input port receives and transmits the input power of the direct current power supply, then the modulating port and the active power decoupling circuit port perform corresponding actions respectively according to a first pulse width modulation control signal and according to a second pulse width modulation control signal or a third pulse width modulation control signal. The current converter has the following characteristics of small size and high reliability.