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

The present invention provides an apparatus for controlling an LED string. In the apparatus, each high voltage (HV) N-type device has one end electrically connected or coupled with the corresponding LED unit and the other end coupled with a corresponding low voltage (LV) current limit switch via a corresponding path. The LV current limit switch is switched according to the voltage or current detected on the path. Since the current flowing through the HV N-type device increases or decreases with that flowing through the corresponding LV current limit switch, the HV N-type device will be indirectly controlled.

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 relates to a voltage doubling type three-winding coupled inductance high-gain DC converter, which relates to the technical field of power electronic converters. The present invention aims to solve the problem that the voltage gain is realized by using a boost converter, but the actual gain of the boost converter does not always increase with the increase of the duty cycle, and the boost capacity is very limited, so that the present invention is not suitable for the situation of high-gain DC power conversion. A three-winding coupled inductor winding for storing energy input from aDC voltage source Vin when the power switch S1 is turned on and amplifying the energy by a voltage doubling structure; It is also used for absorbing leakage inductance energy by parasitic capacitanceof the power switch S1 when the power switch S1 is turned off, so that the voltage at both ends of the power switch S1 is higher than the voltage at both ends of the output capacitance Co, the outputdiode Do is turned on, and the amplified energy is supplied to the load R and the output capacitance Co through the output diode Do. It is used to obtain high gain voltages.

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 present invention provides a high-gain taping inductor quasi-Z-source converter. The converter comprises a direct current input power supply (Vin), a transformer (T) with a turn ratio of 1:n, a first diode (D1), a second diode (D2), a third diode (D3), a first capacitor (C1), a second capacitor (C2), a first inductor (L1), a third capacitor (C3), a fourth diode (D4), a fourth capacitor (C4), a second inductor (L2), a switch tube (S), a fifth diode (D5) , an output capacitor (Cout) and a load. Compared with a flyback converter, the high-gain taping inductor quasi-Z-source converter has high voltage gain and is suitable for the occasion of non-isolated high gain direct voltage transformation.

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.

A boost DC-DC converter with continuous input and output currents includes an inductor L1, a diode D1, a capacitor C1, a resistor R1, a capacitor Co and one electronic switch. The electronic switch has a port a and a port b. One end of the inductor L1 is connected to the positive end of a DC power supply Vi, the other end of the inductor L1 is connected to both the anode of the diode D1 and the port a of the electronic switch, the cathode of the diode D1 is connected with one end of the capacitor C1, one end of the capacitor Co and one end of a load Z, the port b of the electronic switch is connected to the other end of the capacitor C1 and one end of the resistor R1, the other end of the load Z is connected to the other end of the capacitor Co, the other end of the resistor R1 and the negative end of the DC power supply Vi. The converter has the following working characteristics: the input and the output currents are continuous, the output voltage is greater than or equal to the DC power supply voltage, and the output voltage and the DC power supply voltage have the same polarity.

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 relates to a boost type DC-DC converter. The boost type DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a capacitor Co and an electronic switch; theelectronic switch is provided with a port a and a port b; one end of the inductor L1 is connected with the positive end of a DC power source Vi; the other end of the inductor L1 is simultaneously connected with the anode of the diode D1 and the port a of the electronic switch; the cathode of the diode D1 is simultaneously connected with one end of the capacitor C1, one end of the capacitor Co andone end of a load Z; the port b of the electronic switch is simultaneously connected with the other end of the capacitor C1 and one end of the inductor L2; and the other end of the load Z is simultaneously connected with the other end of the capacitor Co, the other end of the inductor L2, and the negative end of the DC power source Vi. The input and output current of the boost type DC-DC converter is continuous, and the output voltage of the boost type DC-DC converter is greater than or equal to the voltage of the DC power source and have the same polarity.

The invention relates to a Boost-improved boost gain Cuk converter single switch DC-DC circuit. The circuit comprises a Boost conversion unit and an improved boost gain Cuk conversion unit with a switched capacitor unit. The Boost conversion unit and the improved boost gain Cuk conversion unit with the switched capacitor unit multiplex a switching tube into a single-switch high-gain circuit; and the input of the Boost conversion unit is connected with a direct-current power supply, and the output end of the improved boost gain Cuk conversion unit with the switched capacitor unit is connected with a load. The circuit provided by the invention has the characteristics of continuous input power supply current and relatively small output current ripple; and high voltage gain, high conversion efficiency and low electromagnetic interference are realized.

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 a zero-ripple high-gain DC-DC converter based on a novel boost unit, including a low-voltage DC power supply V in , power switch tube S, first power diode D 1 , the second power diode D 2 , the third power diode D 3 , the fourth power diode D S1 , the first coupled inductance L 1 , the second coupled inductance L 2 , the first capacitor C 1 , the second capacitor C 2 , output resistance R o and a DC-DC conversion module; the DC-DC conversion module includes a group of new boost units, i=1,...,N, and each group of new boost units includes an independent inductor L i0 , power diode D i0 ,capacitance C i1 and capacitance C i2 The converter of the present invention not only has the characteristics of zero input current ripple, low voltage stress of power devices, simple control circuit, etc., but also can achieve higher voltage output by expanding a specific number of boost units. In addition, in the case of the same output voltage, the more the number of extended boost units, the lower the voltage stress of the power device.

The invention relates to a high-gain forward-flyback laminated boost converter which comprises an input voltage source Vin, a power switch tube S, a diode D1, a diode D2, a diode D3, an output capacitor C1, an output capacitor C2, an output capacitor C3, a load R and a transformer, and is characterized in that the transformer is additionally provided with a third winding; the converter adopts the idea of lamination and energy leakage, the input voltage source is divided into two paths of input, one path of input is input to the forward-flyback converter for energy output, and the other path of input is used for energy output through the third winding. Due to the existence of the third winding, the input voltage can be connected in series with the voltage induced by the third winding in the forward direction and then connected in series with the output capacitor of the forward-flyback converter to supply power to the load, so that the converter has higher gain.

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 discloses a ZCS-PWM Superbuck converter with low electrical stress, comprising a main switch circuit and an auxiliary circuit, the main switch circuit includes a main switch tube and a diode anti-parallel with the main switch tube, the auxiliary circuit includes an auxiliary switch tube, and the auxiliary switch An auxiliary diode is connected between the emitter of the tube and the emitter of the main switching tube, and a resonant branch is connected to the emitter of the auxiliary switching tube. A clamping diode is connected, an energy storage capacitor is connected between the anode of the clamping diode and the collector of the auxiliary switching tube, and a freewheeling current is connected between the emitter of the main switching tube and the connection node of the resonant capacitor and the resonant inductance in the resonant branch. diode. The converter combines the soft switching technology and the Suerbuck converter, so that it has the advantages of low electrical stress, small volume and weight, high efficiency, long life, and little pollution to the power grid.

The invention discloses a double-pipe Z-source direct-current voltage converter. The converter comprises a voltage source, an inductor, a capacitor, a first switch tube, a second switch tube, a first diode, a second diode and a load. The positive electrode of the voltage source is connected with one end of the inductor, and the negative electrode is connected with the source electrode of the first switch tube and the cathode of the first diode. The drain electrode of the first switch tube is connected with the cathode of the second diode, the positive electrode of the capacitor and one end of the load. The drain electrode of the second switch tube is connected with the anode of the first diode, the negative electrode of the capacitor and the other end of the load. The converter is simple in structure and convenient to control, input current is continuous, quite high output voltage gain under the low duty ratio can be achieved and the circuit is free from a start impacting problem.

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 discloses a high-gain voltage type quasi-Y source direct current-direct current converter. A Y source network and a Boost impedance network are combined, the voltage gain of a circuit isflexibly determined through a three-winding transformer in the Y source network, and higher boosting can be achieved under the same duty ratio. Therefore, the problem that the traditional Boost converter can only obtain higher output voltage by increasing the duty ratio, however, the current peak values of the output diode and a switching tube are increased, the conduction loss and the capacitance impact are increased, the conversion efficiency of the circuit is low, and the service life of the circuit is short is solved, so that the converter has the advantages of high conversion efficiencyand high voltage gain, and the circuit structure is simple and reliable.

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.

The invention belongs to DC-DC step-up conversion technology, in particular to a double-input inductance soft-switching high-gain converter and a control method thereof, wherein the positive pole of the input power supply is connected to one end of the first inductance, one end of the second inductance, and an input filter Capacitance C in The positive pole of the input power supply is connected to the source of the first switching tube, the source of the second switching tube, the negative pole of the first capacitor, the drain of the third switching tube, and the input filter capacitor C in The drain of the first switching tube is connected to the other end of the first inductor and the anode of the first diode; the drain of the second switching tube is connected to the other end of the second inductor and the positive electrode of the second capacitor; The cathode of the first diode is connected to the positive pole of the first capacitor and one end of the output filter inductor; the negative pole of the second capacitor is connected to the source of the third switching tube, the negative pole of the output filter capacitor, and one end of the DC load; the output filter inductor The other end of the capacitor is connected to the positive pole of the output filter capacitor and the other end of the DC load.

The invention discloses a quasi-Z source DC-DC converter mixed with active switched capacitors and passive switched inductors, which includes a voltage source, a first inductor, and is composed of a first diode, a first MOS transistor, and a first capacitor. The active switched capacitor unit, the passive switched inductor unit composed of the second diode, the third diode and the second inductor, an output MOS tube, an output diode, an output filter capacitor and an output load. The invention combines the high-gain characteristics of the quasi-Z source, the characteristics of the active switch capacitor and the passive switch inductance, and compared with the 3-Z source network step-up DC-DC converter, the number of inductances is two less, the number of capacitors is the same, and the number of diodes is the same. 5 less, one more MOS transistor, but the voltage gain is significantly improved; compared with the scalable diode-assisted Z-source step-up DC-DC converter (first-stage expansion), the voltage gain is the same, and the number of inductors and capacitors are respectively reduced One and two, the number of diodes is the same, and the number of MOS transistors is one more, so that a higher output voltage gain is achieved with a lower duty cycle.