30results about How to "Input current continuous" patented technology

The invention provides a high-gain Trans-Z source boost converter. The converter comprises a direct-current input power supply Vin, a first inductor (L1), a first diode (D1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a second diode (D2), a transformer (T) with the turn ratio of 1 to n, a switch tube (S), a third diode (D3), an output capacitor (Cout) and a load. The converter is mainly characterized in that a positive electrode of the direct-current input power supply Vin is connected with one end of the first inductor (L1). Compared with a Boost converter, a quasi Z source converter and the like, the high-gain Trans-Z source boost converter has a higher voltage gain, and is suitable for the occasion of non-isolating high-gain direct-current voltage conversion.

The invention discloses a constant-current constant-voltage induction type wireless charging system based on a variable secondary structure. In a receiving part of the system, a receiving coil Ls is sequentially connected with a compensation capacitor Cs, a compensation capacitor Cf, a compensation inductor Lf and a rectifier filter R in series; one end of the constant voltage compensation capacitor CSV, connected in series with a first change-over switch S1, is connected with a common point of the compensation capacitor Cs and the compensation capacitor Cf; and the other end of the constant voltage compensation capacitor CSV, connected in series with the first change-over switch S1, is connected with a common point of the receiving coil Ls and the rectifier filter R; one end of the constant-current compensation capacitor CSC, connected in series with a second change-over switch S2, is connected with a common point of the compensation capacitor Cs and the receiving coil Ls; the other end of the constant-current compensation capacitor CSC, connected in series with the second change-over switch S2, is connected with a common point of the compensation inductor Lf and the compensationcapacitor Cf. Constant-voltage and constant-current output of the system is achieved by controlling the states of the first change-over switch S1 and the first change-over switch S2.

The invention relates to a quadratic high-gain boost converter with a continuous input current, comprising an input boost module, a voltage conversion module and a rectifier filter output module, specifically comprising a first switching tube S1, a second switching tube S2, a first inductance L1, a second inductance L2 or transformer T, a first diode D1, a second diode D2, a first capacitor C1 anda second capacitor C2, and comprising a non-isolated topological structure or an isolated topological structure. The quadratic high-gain boost converter provided by the invention can realize non-isolated boost of an output voltage and also can realize isolated boost of the output voltage, thereby being applicable to an occasion that a high voltage needs to be output in a boost mode.

The invention belongs to the field of power network control circuit topology, in particular to a DC/DC converter topology. According to the invention, each power source of the structure is capable oftransmitting or receiving electrical energy individually or simultaneously with a load or grid, enabling flexible two-way flow management, high frequency coupling transformer with three windings realizes electrical isolation, At that same time, the turn ratio can be designed quickly according to the voltage matching relation of the front and back terminals, Circuit and equipment design complexityis simplify, by using the shunt capacitor of the switch and the leakage inductance of the transformer to realize the resonance and energy conversion, the soft switching can be realized without the aidof the peripheral auxiliary circuit, the circuit structure is simplified, the circuit cost is reduced, the energy conversion requirement under different power can be met, and the application range ofthe converter is improved.

The present invention provides a coupled inductor quasi-Z-source DC-DC converter. The converter comprises a direct current input power supply, a first inductor (L1), a first diode (D1), a first capacitor (C1), a second capacitor (C2), a transformer with a turn ratio of 1:n, a switch tube (S), a second diode (D2), an output capacitor (Cout) and a load. Compared with a flyback converter, the quasi-Z-source converter has high voltage gain and is suitable for the occasion of non-isolated high gain direct voltage transformation.

The invention discloses an interleaved parallel switch full-bridge inverter and an interleaved parallel control method. The interleaved parallel switch full-bridge inverter comprises an input capacitor, a first diode, a second diode, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a first inductor and a second inductor. The inverter has the advantage that size and weight of the inductors are reduced, and quantity of the switch tubes is decreased; the problems of reverse recovery of the diodes and the like are avoided, and efficiency and reliability are improved; common-mode voltage between a direct-current bus and an alternating-current bus is mainly low-frequency variable voltage to be beneficial to reducing of size of an EMI (electro-magnetic interference) filter; when sizes of output inductive current ripples are same, switch interleaving is beneficial to reducing of output filter inductance, so that input current is continuous, and input filters are decreased; and coupling inductance is conducive to inductance multiplexing to further reduce filter inductance.

A boost DC-DC converter with continuous input and output currents includes a diode D1, a capacitor C1, an inductor L1, an inductor L2, a capacitor Co and one electronic switch, the electronic switch has a port a and a port b, the anode of the diode D1 is simultaneously connected to the positive terminal of a DC power supply Vi and to the port a of the electronic switch, the cathode of the diode D1is connected to one end of the capacitor C1 and one end of the inductor L1 at the same time, the port b of the electronic switch is simultaneously connected to the other end of the capacitor C1 and one end of the inductor L2, the other end of the inductor L1 is simultaneously connected to one end of the capacitor Co and one end of a load Z, and the other end of the load Z is simultaneously connected to the other end of the capacitor Co, the other end of the inductor L2 and the negative end of the DC power supply Vi. The boost DC-DC converter is characterized in that the input and output currents are continuous, the output voltage is greater than or equal to the DC power supply voltage, and the output voltage is of the same polarity.

The invention discloses a single-phase single-stage boost inverter and a control method. The single-phase single-stage boost inverter comprises switching tubes S1-S6, a direct-current bus capacitor Cdc, an input power supply Uin, a first boost inductor L1, a second boost inductor L2, a filter capacitor Cf and a filter inductor Lf. Compared with a traditional interleaved Boost+VSI two-stage scheme, the equivalent switching frequency of the system is doubled, and the input current pulsation rate is reduced, so that the size of a required filter device is reduced, the use of two power diodes is reduced, boosting and inversion control are realized at the same time only through one-stage power conversion, therefore, the system has higher integration level and system efficiency, has the advantages of continuous input current, simple structure, low cost and the like, and also has the capability of inhibiting common-mode current. Therefore, the single-phase single-stage boost inverter is particularly suitable for a high-power distributed grid-connected power generation system.

The quasi-switched capacitor type high-gain DC-DC converter is characterized in that one end of a first inductor L1 is connected with the positive electrode of a DC input voltage source Vin, and the other end of the first inductor L1 is connected with the negative electrode of a second capacitor C2, the positive electrode of a first diode D1 and the drain electrode of a first MOS tube S1; the source electrode of the first MOS tube S1 is connected with the negative electrode of the first capacitor C1 and the positive electrode of the third capacitor C3, the negative electrode of the first diode D1 is connected with the positive electrode of the second diode D2, and the positive electrode of the first capacitor C1 is connected with the common end of the first diode D1 and the second diode D2. The negative electrode of the second diode D2 is connected with the positive electrode of a second capacitor C2, the drain electrode of a second MOS tube S2 and the positive electrode of a fourth diode D4, the negative electrode of the fourth diode D4 is connected with the positive electrode of a third capacitor C3, and the negative electrode of the third capacitor C3, the source electrode of the second MOS tube S2 and the negative electrode of the third capacitor C3 are all connected with the negative electrode of a direct current input voltage source Vin. Two ends of the third capacitor C3 are used for parallel connection with a load and supplying power to the load.

The invention provides a hybrid quasi Z source converter employing transformer. The converter comprises a direct-current input power supply, the transformer (T) with the turn ratio of 1 to n, a first diode (D1), a first capacitor (C1), a second capacitor (C2), a first inductor (L1), a third capacitor (C3), a second diode (D2), a fourth capacitor (C4), a second inductor (L2), a switch tube (S), a third diode (D3), an output capacitor (Cout) and a load. Compared with a flyback converter, a quasi Z source converter and the like, the hybrid quasi Z source converter provided by the invention has a higher voltage gain, and is suitable for the occasion of non-isolating high-gain direct-current voltage conversion.

The invention discloses a coupling inductance quasi-z source inverter based on a voltage doubling capacitor and a modulation method of the coupling inductance quasi-z source inverter, and relates to the technical field of inverters. The invention aims at solving the problems that the voltage boosting capability of the traditional Z-source inverter is limited by straight-through time and the outputvoltage harmonic content is increased due to the fact that the straight-through time is too large, the input current of a DC power supply is interrupted, and large resonant current can be generated when a device is started to cause damage to the device. When an upper bridge arm and a lower bridge arm of a three-phase inverter are in a straight-through state, a quasi-z source network is disconnected to the three-phase inverter, an electrolytic capacitor C3 and the DC power supply charge an inductor L1, an electrolytic capacitor C2 charges a primary winding of a coupling inductor, and a secondary winding L12 of the coupling inductor L charges an electrolytic capacitor C1 through a diode D2, so that voltage doubling is realized. The voltage boosting capability of the circuit is improved.

The invention relates to the field of power electronics, and in particular relates to a SWISS forward rectifier based on resonance reset isolation. The rectifier comprises an input RC filter circuit,a rectifier bridge composed of six diodes, a harmonic injection circuit network composed of six diodes and six IGBTs, two fast turn-off switching tubes (T+ and T), an isolated forward DC-DC convertercomposed of two high-frequency transformers and diodes D+ and D-, and finally is connected with an RLC output circuit in series. Generally speaking, in direct current-direct current applications, a full bridge exhibits better performance over a range of applications of several kilowatts, because the full bridge can achieve zero voltage switching, and the voltage stress in a transistor is equal tothe input voltage. On the other hand, the forward converter has a hard switch and higher transistor voltage stress, and the forward converter is only provided with one power transistor, so that the system is not complex and has lower conduction loss.