32results about How to "Strong boosting ability" patented technology

The invention discloses a cascaded DC / DC converter for an asymmetric boost unit of a photovoltaic system, which comprises an input power supply Vin, wherein a positive electrode of the input power supply Vin is connected with one end of an inductor L1, the other end of the inductor L1 is connected with an anode of a free-wheeling diode D1 and an anode of a free-wheeling diode D2, a cathode of thefree-wheeling diode D1 is connected with one end of an inductor L2, one end of a capacitor C1 and one end of a capacitor C2, the other end of the inductor L2 is connected with an anode of a free-wheeling diode D4, one end of a capacitor C3, a cathode of the free-wheeling diode D2 and a drain electrode of a switching tube S, the other end of the capacitor C2 is connected with a cathode of the free-wheeling diode D4 and an anode of a free-wheeling diode D3, the other end of the capacitor C3 is connected with a cathode of the free-wheeling diode D3 and an anode of an output rectifying diode Do,a cathode of the output rectifying diode Do is connected with one end of an output capacitor Co and one end of a load resistor R, and the other end of the output capacitor Co, the other end of the load resistor R, a source electrode of the switching tube S and the other end of the capacitor C1 are connected with a negative electrode of the input power supply Vin. The cascaded DC / DC converter can improve the efficiency and the gain ratio.

The invention discloses a multi-input boost converter based on Switch-Capacitor networks. The multi-input boost converter is mainly formed by connecting multiple Switch-Capacitor networks in parallel, the capacitor voltages in all the Switch-Capacitor networks are equal, and a larger output voltage is achieved through the mode of accumulating multiple network capacitor voltages. The multi-input boost converter is used for replacing multiple single-input boost converters. The multi-input boost converter allows the input of multiple energy sources, the properties, the amplitude values and the characters of input sources can be identical and can also be very different, the input sources can supply power to loads respectively or simultaneously, and therefore the stability and the flexibility of a system are improved, the preferential utilization of the energy sources is achieved, and system cost is lowered.

The invention discloses a secondary DC-DC converter of an asymmetrical voltage boosting unit of a fuel cell system. The converter comprises an input power supply V<in>; the positive electrode of the input power supply V<in> is connected with one end of an inductor L1 and the positive electrode of a fly-wheel diode D3; the other end of the inductor L1 is connected with the positive electrode of a fly-wheel diode D2 and one end of a capacitor C2 separately; the other end of the capacitor C2 is connected with the positive electrode of a fly-wheel diode D1 and the negative electrode of the fly-wheel diode D3 separately; the negative electrode of the fly-wheel diode D1 is connected with one end of an inductor L2, one end of a capacitor C1 and one end of a capacitor C4 separately; and the otherend of the inductor L2 is connected with the positive electrode of a fly-wheel diode D4, one end of a capacitor C3, the negative electrode of the fly-wheel diode D2 and the drain of a switching tube Sseparately.

The invention provides a high voltage rise DC / DC converter. The high voltage rise DC / DC converter can convert a low voltage direct current into a high voltage direct current, can achieve soft switching, and has high work efficiency. The high pressure rise DC / DC converter comprises two portions which are respectively a boost circuit unit and a voltage rise unit. The boost circuit unit is composed of two power switches S1 and S2, and a primary side L 1 of a coupling inductor. A subsidiary side L 2 of the coupling inductor, a capacitor c and a diode D form the voltage rise unit of the high voltage rise DC / DC converter. The voltage rise unit is equivalent to a controllable direct current voltage source, and voltage of the voltage rise unit is related to turn ratios N of the subsidiary side and the primary side of the coupling inductor, and the duty ratio D of a switching tube S1. Compared with an existing high voltage rise DC / DC converter, the high voltage rise DC / DC converter is high in voltage gain, low in voltage stress of devices, and high in efficiency.

The invention belongs to the technical field of converters, and discloses a high-gain converter for a photovoltaic direct-current module and a control method of the high-gain converter. The positive electrode of an input filter capacitor of the converter is connected with one end of a first inductor and one end of a second inductor; the other end of the first inductor is connected with the drain electrode of the first switch tube and the positive electrode of the first capacitor; the other end of the second inductor is connected with the drain electrode of the second switch tube, the anode of the second diode and the cathode of the second capacitor; the source electrode of the second switch tube is connected with the cathode of the first capacitor and the anode of the first diode; the cathode of the second diode is connected with one end of the third inductor and the anode of the third capacitor; the other end of the third inductor is connected with the anode of the third diode and the anode of the second capacitor; and the cathode of the third diode D3 is connected with the anode of the output filter capacitor. The high-gain converter has the advantages of being high in boosting capacity, few in power tubes, small in input current ripple and the like.

The invention relates to the field of power electronics, in particular to a multi-stage single switch boost converter which is composed of a Boost circuit and a plurality of Switch-Capacitor networks. Voltages supplied by all the Switch-Capacitor networks are equal. Accumulation of the network voltages is achieved in an interleaving series connection mode, an output voltage is boosted, and the capacity of boosting is high. The converter is provided with only one active switch element, a control circuit is simple, and voltage stress of a switching tube is small and 1 / (1-D) times that of an input voltage. Capacitor voltages of all the Switch-Capacitor networks are equal and 1 / (1-D) times that of the input voltage, stress of the capacitor voltages is small, therefore, the size of the circuit is reduced, and integration is easy.

The invention belongs to the technical field of converter control, and discloses a three-port converter with soft switching capability. The converter includes two switch tubes, three capacitors, two diodes and two inductors. It can realize the flexible control of the power flow between the three ports, and can realize the zero-voltage turn-on of all switch tubes and the natural turn-off of all diodes. All power tubes are under low voltage stress, which effectively improves the off-grid photovoltaic system. Integration and conversion efficiency of power generation system. The invention also discloses the control method of the converter. The first inductance is designed to work in the current discontinuous mode, and the frequency conversion control is adopted to realize load constant voltage control; the second inductance is designed to work in the current bidirectional continuous conduction mode, and the variable duty ratio is adopted. Realize maximum power point tracking control of photovoltaic modules.

The invention discloses a single-phase high-gain photovoltaic grid-connected inverter with continuous input current and a control method. The inverter includes a boost circuit and a full-bridge inverter circuit. The boost circuit includes a first boost inductor L 1 , the second boost inductor L 2 , the first boost capacitor C 1 , the second boost capacitor C 2 and the first boost diode D 1 . Inductance L 1 One end of the diode D 1 The anode, capacitor C 2 connected to the cathode of the diode D 1 The cathode and capacitance C 1 positive pole, inductance L 2 connected at one end. The full-bridge inverter circuit includes a switch tube S 1 ‑S 4 , switch tube S 1 and S 2 connected in series to form the first bridge arm circuit, the switch tube S 3 and S 4 The second bridge arm circuit is formed in series, and the two bridge arm circuits are connected in parallel. The present invention realizes the high-gain step-up inverter under the condition of low duty ratio, and has the advantages of continuous input current, adapting to wide-ranging input voltage changes, high conversion efficiency, low capacitor voltage stress, simple structure, and low cost. It is especially suitable for small and medium power distributed photovoltaic grid-connected power generation systems.

The invention provides an active coupling inductance network boost converter, and relates to the field of power electronic converters. The active coupling inductance network boost converter solves the problems that according to an existing boost converter of an active coupling inductance network structure, the number of conversion devices is large, the boost multiple is small, the conversion efficiency is low, the power density is large, and the voltage stress of a main power switch tube is low. According to the active coupling inductance network boost converter, the input end of an X-type active coupling inductance network is connected with a direct current voltage source, the output end of the X-type active coupling inductance network is connected with diodes and smoothing capacitors, and a passive lossless clamping circuit is inserted into the X-type active coupling inductance network. The active coupling inductance network boost converter can be applied to occasions of new energy power generation, fuel cells and the like.

The invention discloses a passive rectification circuit in the technical field of power electronics, which includes an AC power supply and a rectification circuit. The AC power supply includes a first voltage source and a second voltage source, both of which share a ground; the rectification circuit is composed of The cascaded at least one rectifier unit and one freewheeling unit input a two-phase AC voltage to generate a high-voltage DC voltage to supply the load of the subsequent stage. The invention has a rectification function, can generate a high-amplitude direct-current voltage, and the more stages there are, the higher the output direct-current voltage level is, and has the advantages of strong boosting capability, simple structure, low cost and the like.

The invention discloses a multi-input boost converter based on Switch-Capacitor networks. The multi-input boost converter is mainly formed by connecting multiple Switch-Capacitor networks in parallel, the capacitor voltages in all the Switch-Capacitor networks are equal, and a larger output voltage is achieved through the mode of accumulating multiple network capacitor voltages. The multi-input boost converter is used for replacing multiple single-input boost converters. The multi-input boost converter allows the input of multiple energy sources, the properties, the amplitude values and the characters of input sources can be identical and can also be very different, the input sources can supply power to loads respectively or simultaneously, and therefore the stability and the flexibility of a system are improved, the preferential utilization of the energy sources is achieved, and system cost is lowered.

The invention discloses a non-isolated high-gain DC converter. The positive pole of the DC power supply of the converter is connected to the positive pole of the input filter capacitor, one end of the first inductor, and the anode of the third diode; the other end of the first inductor is connected to the anode of the first diode and the anode of the second diode; The cathode of the tube is connected to one end of the second inductance and the cathode of the third diode; the other end of the second inductance is connected to the anode of the fourth diode and the anode of the fifth diode; the cathode of the fifth diode is connected to the anode of the first capacitor and the anode of the first capacitor One end of the three inductors is connected; the other end of the third inductor is connected to the cathode of the first diode, the cathode of the fourth diode, the anode of the sixth diode, and the drain of the switch tube; the cathode of the sixth diode is connected to the positive electrode of the output filter capacitor, One end of the DC load is connected; the other end of the DC load is connected to the negative pole of the output filter capacitor, the source of the switch tube, the negative pole of the first capacitor, the negative pole of the input filter capacitor, and the negative pole of the input power supply, with strong boosting capability and low current stress.

The invention discloses a multi-temperature-zone large-temperature-span heat pump circulating system adopting an injector for efficiency improvement. The multi-temperature-zone large-temperature-spanheat pump circulating system comprises a compressor with a middle air extraction function, series compressors and parallel compressors; a first condenser is used for heating of a low-temperature zone,and an inlet is connected with an air extraction opening of the compressor; a second condenser is used for heating of a high-temperature zone, and an inlet is connected with an air exhaust opening ofthe compressor; a high-pressure side inlet of a reheater is connected with an outlet of the first condenser, and a high-pressure side outlet of the reheater is connected with a throttling device; aninlet of a first evaporator is connected with an outlet of the throttling device, and an outlet of the first evaporator is connected with a secondary flowing inlet of the injector; an inlet of a second evaporator is connected with an outlet of the injector, and an outlet of the second evaporator is connected with a low-pressure side inlet of the reheater; and a nozzle inlet of the injector is connected with an outlet of the second condenser, and an outlet of the injector is connected with the inlet of the second evaporator. The circulating system can effectively utilize the middle air extraction function of the compressor to achieve double condensing pressure and condensing temperature and provide double temperature zones and large-temperature-difference heat supply, irreversible losses ofheat transfer of the evaporators can be decreased, and the whole performance of the system can be effectively improved.

The invention discloses a CCM single bridge arm integrated single-phase boost inverter and a control method. Compared with the traditional Boost integrated boost inverter, the inverter proposed in the present invention only adds one inductor, one capacitor and one diode, and realizes the high-gain boost inverter in the CCM mode. Due to the continuous input current, the current stress and on-state loss of the inductor and power tube will be greatly reduced, and the boost capacity will not change sharply with the load power, which improves the system reliability; moreover, the boost bridge arm can use PWM control is used for voltage regulation, so it is suitable for photovoltaic power generation, independent inverters and other step-up inverter occasions where the output power cannot be adjusted and the input voltage varies in a wide range, and the application range is wider. In addition, it also has the advantages of strong boosting capability, high conversion efficiency, low capacitive voltage stress, simple structure, and low cost.

The invention discloses a multistage direct current circuit with controllable voltage and belongs to the technical field of power electronics. The multistage direct current circuit with controllable voltage comprises a rectifying circuit and an inverter circuit, wherein the rectifying circuit is composed of six rectifying units and a follow current unit, the six rectifying units are sequentially connected in series and based on reverse conducting switches, two paths of alternating current square wave voltages are input into the rectifying circuit, and a path of direct current voltage is output by the rectifying circuit. The direct current voltage is input into the inverter circuit, two paths of alternating current voltages with adjustable frequencies are output through a high frequency isolation transformer, and power is supplied to the rectifying circuit at the following stage. The multistage direct current circuit with controllable voltage has the boost function and the electrical isolation function, the more the number of stages is, the higher the class of the output direct current voltage is, and the multistage direct current circuit with controllable voltage has the advantages of high in boost performance, simple in structure, low in cost, high in power level and the like.

In the converter disclosed by the invention, the positive pole of the DC power supply is connected to the positive pole of the input filter capacitor and one end of the first and third inductors; the other end of the first inductor is connected to the drain of the first switch tube, the anode of the first diode, and the negative pole of the first capacitor; The other end of the three inductors is connected to the drain of the second switch tube, the anode of the second diode, and the cathode of the second capacitor; the anode of the first capacitor is connected to the anode of the third diode and one end of the second inductor; the cathode of the third diode is connected to the first The anode of the output filter capacitor and one end of the DC load; the cathode of the first output filter capacitor is connected to the other end of the second inductor, the cathode of the fourth diode, and the anode of the second output filter capacitor; the anode of the second capacitor is connected to the anode of the fourth diode and the anode of the fourth diode. One end of the inductor; the negative electrode of the second output filter capacitor is connected to the other end of the fourth inductor, the positive electrode of the third output filter capacitor, and the cathodes of the first and second diodes; the other end of the DC load is connected to the negative electrode of the input filter capacitor, the negative electrode of the third output filter capacitor, the first and second diodes The source of the two switch tubes and the negative pole of the DC power supply.

The invention aims to provide the circuit topology of a variable-structure multi-input high-gain direct-current converter. By means of the variable-structure multi-input high-gain direct-current converter, combined power generation of various renewable energy sources can be realized, high gain generated during independent solar power generation at a low voltage level can also be realized, and the cost and the complexity of a system are not increased at the same time.