33results about How to "Reduce the turns ratio" patented technology

The present invention relates, in general, to a charge equalization apparatus with series-connected battery cells and, more particularly, to a charge equalization apparatus, in which series-connected battery cells (Bl to BN) are connected in parallel with the primary windings (Mi l to MlN) of transformers (Tl to TN), switches (Sl to SN) for controlling the flow of current of the primary windings are connected in series with the primary windings (Ml 1 to MlN), and multiple secondary windings (M21 to M2N) corresponding to the primary windings are connected in parallel with each other.

The present invention proposes a new structure for a high input VRM. In this present invention, the interleaved voltage regulator is provided. The interleaved voltage regulator includes an integrated magnetic device for performing both transformer and output choke filter function, a first switch, a second switch, a third switch, and a fourth switch, wherein the integrated magnetic device includes a transformer having a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding, a first choke filter having one end coupled to a first terminal of the first secondary winding, and a second choke filter having one end coupled to a first terminal of the second secondary winding, and the other end of the second choke filter coupled to the other end of the first choke filter to form the output terminal of the isolated voltage regulator. The first switch, the second switch, the first choke filter, and the first secondary winding form a synchronous rectifier circuit. The third switch, the fourth switch, the second choke filter, and the second secondary winding form another synchronous rectifier circuit.

The invention belongs to the field of electrical technology, and relates to a single-stage photovoltaic off-grid inverter and a control method thereof. A switch tube is used on the primary side of the isolation transformer to realize two-way excitation of the transformer, and the switch tube can realize both zero-voltage turn-on and zero-voltage switching. The voltage is turned off, and energy can be transmitted to the secondary side of the transformer during the turn-on and turn-off periods; the secondary side of the transformer adopts two sets of high-frequency full-wave rectification circuits, which are controlled to output according to the power frequency, and then connected in reverse parallel, combined with the high-frequency switch on the primary side of the transformer The modulation of the tube forms a pulse sequence that changes according to the law of sinusoidal modulation, and becomes a power frequency 220V AC after filtering; its circuit structure is simple, small in size, low in cost, high in efficiency, easy to control, and high in reliability. In addition to small off-grid inverters, it can also be applied to other small off-grid inverters, vehicle-mounted inverters, UPS power supplies, frequency converters, and isolated step-up DC-AC converters.

This invention relates to a device and a method for converting voltages by a switch mode, in which, the device includes a switch supply, an inductor, diodes and capacitors, and the inductor includes a primary coil and a secondary coil coupled to each other, both ends of the secondary coil are parallel to two branches with two diodes serial to capacitors to commutate and filter the positive and negative induced voltages to form a DC supply, which can be laminated to generate a voltage meeting the requirement.

The present invention discloses a multi-unit diode capacitor network high-gain full-bridge isolated direct current converter. A transformer T is connected with an excitation inductor Lm in parallel and is connected with the leakage inductor Lk equivalent to the edge in series; an LC filtering circuit is composed of a filtering circuit Lf and a filtering capacitor Cf; and the anode of an input power supply Vdc is connected with the direct current side anode of a full-bridge inversion circuit, the cathode of the input power supply Vdc is connected with the cathode of the full-bridge inversion circuit direct current side, and a boost full-bridge inversion circuit is formed. The multi-unit diode capacitor network high-gain full-bridge isolated direct current converter can improve the voltage gain, obtain high voltage gain, reduce the voltage stress of a power device, reduce the turn ratio of a transformer, reduce the size of a magnetic element and improve the power density. The multi-unit diode capacitor network high-gain full-bridge isolated direct current converter employs the transformer leakage inductor and the circuit resonance to realize the zero current switching (ZCS) of a main power device to reduce the switch loss and improve the electric energy transition efficiency. The multi-unit diode capacitor network high-gain full-bridge isolated direct current converter has a wide application prospect in a new energy distributed power generation system.

The invention discloses a high-voltage transmission ratio bidirectional DC converter and a control method thereof. The high-voltage transmission ratio bidirectional DC converter mainly comprises a high-voltage side three-phase full-bridge consisting of six switch tubes, a Y-delta shaped three-phase transformer and a low-voltage side three-phase bridge arm consisting of three filtering inductors and three switch tubes. The invention also provides a control method of the high-voltage transmission ratio bidirectional DC converter. The internal characteristics and the control mode of the Y-delta shaped three-phase transformer are utilized to improve the voltage transformation ratio by one time in comparison with a traditional bidirectional DC converter, so that the turn ratio of the transformer is reduced by one time, and the leakage inductance is greatly reduced, the electromagnetism compatibility of the transformer is improved. The low-voltage side three-phase inductors are parallelly connected in a staggered manner, and the output current ripple is greatly reduced after the three-phase current ripples are stacked, so that the service life of a storage battery can be favorably prolonged, and the size of a filter is favorably reduced. The high voltage side and the low voltage side both adopt the three-phase staggered shunt-wound structure, so that the current stress of the switch tubes is reduced and suitable switch tubes can be conveniently selected for high-power application occasions.

The invention discloses a voltage-doubling type soft switching push-pull DC converter, which structurally comprises a DC voltage source Vin(1), first, second and third power transistors S1, S2, S3 (2) with anti-parallel diodes and junction capacitors, a high-frequency isolation transformer Tr(3), a voltage-doubling rectifying circuit (4), a capacitor filtering circuit and an output load (5), wherein the high-frequency isolation transformer Tr (3) comprises a primary-side first winding NP1, a primary-side second winding NP2 and a secondary-side winding Ns. According to the invention, a filter inductor is removed from the converter, thereby being conducive to reducing the size and the weight of the converter; a voltage-doubling rectification structure is adopted to improve step-up ratio of the converter, the turn ratio of the high-frequency isolation transformer is reduced under the same input / output voltage level, and the size and the weight of the transformer are reduced; the power transistors of the converter can realize zero-voltage turn-on and turn-off, thereby reducing the switching loss; and the rectifier diode is zero-current turn-off, thereby solving problems of voltage stress and loss brought about by reverse recovery of the diode, and improving the work efficiency of the converter.

The invention discloses a multi-unit coupled inductance switched capacitor network high-gain DC converter, which includes an input power supply V in , a controllable switch tube S, a coupled inductor with multiple windings on the secondary side, multiple two-port diode capacitor boost units, a diode D, an output capacitor C, and an output load R L ;The main circuit topology fully combines the characteristics of the multi-winding coupled inductor and the diode capacitor boost unit, overcomes the inherent defect of the diode capacitor network inrush current, significantly improves the voltage gain, reduces the voltage stress of the switch tube, and realizes the natural shutdown of all diode capacitors , reduce switching loss, improve power conversion efficiency, and multi-unit coupled inductor switched capacitor network high-gain DC converter has broad application prospects in new energy distributed power generation systems.

The invention relates to a novel wireless fluorescent lamp which works in a bright arc transition zone, comprising a lamp tube, an electrode, a drive, a lamp casing and a lamp cup or lampshade. The electrode consists of tungsten, or molybdenum or iron. More than one layers of anti cathode sputtering films are arranged on the surface of the electrode. Super-pure argon air is filled into the lamp tube with an air-filling pressure ranging from 800 Pa to 6665Pa. The work current of the lamp tube is between 7MA and 60MA. A cold end is arranged in the lamp tube and a titanium mercury zirconium aluminum 16 alloy amalgam or an indium mercury zirconium aluminum 16 alloy amalgam is arranged in the cold end. An insulation layer is arranged between the lamp cup or lampshade and the lamp casing. The cold end extends from the lamp cup or lampshade to the insulation layer. The invention enhances light effect and surface brightness, and has small volume, high flux, enhanced reliability and long service life. The manufacture of the drive is easy, the manufacturing cost is low and the cost performance is high, furthermore, the proposal of the EMC is easy, the cost for restraining electromagnetic interference wires is low and the effect for restraining electromagnetic interference is good.