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755 results about "Autotransformer" patented technology

An autotransformer is an electrical transformer with only one winding. The "auto" (Greek for "self") prefix refers to the single coil acting alone, not to any kind of automatic mechanism. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings which are not electrically connected to it .

Power control system for reducing power to lighting systems

A power control system is disclosed for controlling the power supplied to a lighting system and limiting power during time of peak demands and the like wherein the lighting system includes a power source and a lighting load connected to the power source. The control system comprises a main transformer having a first winding and a second winding, the first winding being connected between the power source and the lighting load. An autotransformer connected to the power source having a plurality of electrical transformer taps with prescribed voltage values. A plurality of solid-state tap switches is connected to the transformer taps and to the second winding of the main transformer to apply the prescribed voltage values across the second winding. A system controller has an input for receiving a voltage change signal representing a selected load voltage to be applied to the lighting load. The controller is connected to the tap switches for selectively closing one of the tap switches to produce said prescribed voltage value across the second winding of the main transformer whereby the selected load voltage is output across the first winding of the main transformer and applied to the lighting load without interruption of the lighting. A transient control circuit is connected across an output of the tap switches for dissipating transient currents during switching of tap switches.
Owner:ASP CORP

Process for generating voltage pulse sequences and circuit assembly therefor

An electrical circuit arrangement for producing pulsed-voltage sequences for the operation of discharges which are impeded dielectrically comprises a series circuit formed from a tuned circuit inductance (TR2-A) and a controlled switch (T1), a pulse generator (OS) which drives the switch (T1), an electrical valve (D1) which is connected in parallel with the switch (T1), a tuned circuit capacitance (C2) which is likewise connected in parallel with the switch (T1), a means (TR2-B, a'', b'') for coupling a lamp (La1) to at least one electrode which is impeded dielectrically, and, optionally, a buffer and feedback capacitor (C1) which is connected in parallel with the series circuit formed by the tuned circuit inductance (TR2-A) and the switch (T1). The means for coupling a lamp comprises in particular two connections (a'', b'') and the secondary winding (TR2-B) of an autotransformer (TR2), which is connected between a first pole of the switch (T1) and the corresponding connection (a''), the primary winding (TR2-A) of the autotransformer (TR2) acting as the tuned circuit inductance. The second connection (b') is connected to the second pole of the switch (T1). In operation, the switch (T1) opens and closes alternately in time with the drive signal of the pulse generator (OS), as a result of which a sequence of voltage pulses, which are separated by pauses, is produced at the electrodes, which are impeded dielectrically, of a lamp (La1) which is connected to the connections (a'', b'').
Owner:PATENT TREUHAND GESELLSCHAFT FUR ELECTRIC GLUEHLAMPEN MBH

Autotransformer-based system and method of current harmonics reduction in a circuit

A system and method for reducing harmonics in a circuit is disclosed. The system comprises a main rectifier, (n3-1)auxiliary rectifiers connected to the main rectifier, and an autotransformer connected to both the main rectifier and the auxiliary rectifiers which provides 2n-pulse rectification where n equals the number of phases of the system. The autotransformer generates (n3-1)auxiliary voltage sets, each auxiliary voltage set having an auxiliary voltage amplitude, k, and an auxiliary voltage phase, α, wherein k=4+2⁢3⁢cos⁢(θ-7⁢π6)and wherein α=sin-1⁢(3⁢sin⁢ ⁢θ-0.5k)assuming a main voltage amplitude of one and a main voltage phase of ninety degrees, wherein θ=180⁢°nand its integral multiples for all possible real values of k. The main rectifier has a main rectifier power rating, Pmdb wherein Pmdb≥(n+32⁢n)times the load power, and the auxiliary rectifiers each have an auxiliary power rating, Pauxdb, wherein Pauxdb≤(32⁢n)times the load power.
Owner:BALDOR ELECTRIC COMPANY

Cut-off ground fault recognition method for electrified railroad AT power supply contact system

ActiveCN101404409ASolve the problem that the disconnected ground fault is difficult to identifySolve the problem of refusal to moveEmergency protective circuit arrangementsFault locationContact networkPower factor
The invention relates to an identifying method for the line breaking and ground faults of an AT power supply contact network of an electrified railway which comprises: judging and identifying whether an element achieves the starting condition or not; calculating a real time power factor according to a bus voltage and a feeder line current; calculating the self-adapting control amount and the secondary harmonic content according to the harmonics 1. 2, 3, 5 and 7 of the feeder line current; judging whether the power factor regulated by the self-adapting control amount and the self-adapting control amount are in the motion range or not and judging whether the secondary harmonic content is smaller than a setting value or not; if yes, all the conditions can be met; then giving out alarming signal or tripping, uploading the failure data information; or quitting and initializing the identifying element. The identifying method can identify the high impedance failure formed by line breaking and grounding and ensure the identifying element for the feeder line protection device of a microcomputer to be not mistakenly moved when various electric power engines run under load, under the temporary state of exciting surges and under the working condition of heavy load; simultaneously, the identifying method solves the problem of failure to operate of the normal protections after the stepout of the AT (autotransformer).
Owner:NARI TECH CO LTD +1

Non-isolated resonant converter

A non-isolated resonant converter is provided. The provided non-isolated resonant converter includes a switch circuit, a resonant circuit and a rectifying-filtering circuit. The switch circuit, the resonant circuit and the rectifying-filtering circuit are sequentially connected. The resonant circuit includes an auto-transformer, a capacitor and an inductor, wherein the capacitor and the inductor are connected to the auto-transformer. The configuration of the provided non-isolated resonant converter has small size, low loss and high power density.
Owner:SPI ELECTRONICS +1

Single-phase three-winding autotransformer model taking account of nonlinear influences of excitation impedance

The invention discloses a single-phase three-winding autotransformer model taking nonlinear influences of excitation impedance into consideration, which belongs to the technical field of transformers. The single-phase three-winding auto-transformer model comprises a basic electric circuit and magnetic circuit equation of a single-phase three-winding step-down autotransformer, an equivalent circuit of a single-phase three-winding autotransformer, an equivalent circuit of a single-phase three-winding step-up autotransformer, an expression of an excitation impedance zm and an expression of the single-phase three-winding autotransformer model taking account of the nonlinear influences of the excitation impedance. The autotransformer model not only takes account of the magnetic coupling between a high-voltage winding and a medium-voltage winding but also takes account of the electrical relationship, and the result of a harmonic characteristic simulation performed by the single-phase three-winding autotransformer model is more actual than that of the harmonic characteristic simulation performed by a common three-winding transformer instead of the three-winding autotransformer. The excitation impedance not only comprises generally non-ignorable nonlinear inductance reflecting iron core saturation characteristics, but also takes account of the nonlinear resistance reflecting iron losses, and the harmonic characteristic of a transformer can be analyzed more accurately by using the excitation impedance.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Transient impedance transformer based on ac voltage regulating electronic switch

A superposition principle of waveform based on conceptions of waveform continuity and flexible regulation of voltage proposes three concepts, respectively being flexible AC transformation, flexible power transmission and transformation and flexible voltage regulation; proposes three new technologies, respectively being a transient impedance technology, a flexible stepless voltage regulation technology and a flexible stepped voltage regulation technology; proposes three new products, being an AC voltage regulating electronic switch, a transient impedance transformer and a high-speed voltage regulating transformer; proposes six high-voltage power grid connection methods, being a power grid connection method type of a transient impedance transformer, a power grid connection method of a transient impedance step up auto transformer and the like; and proposes a new reactive compensation connection method for a reactive compensation device.
Owner:SUN CHONGSHAN

Autotransformer with low-voltage compensation

The invention discloses an autotransformer with low-voltage compensation, comprising a main transformer, a voltage regulator and a compensating device, wherein the main transformer comprises a low voltage winding, a common winding and a series winding; the voltage regulator comprises a voltage regulating switch, a voltage regulating winding and a first exciting winding which carries out excitationfor the voltage regulating winding; the compensating device comprises a compensation winding and a second excitation winding which carries out excitation for the compensation winding; the beginning end of the low voltage winding is connected with the beginning end of the first exciting winding; and the tail end of the low voltage winding is connected with the compensation winding in series. The autotransformer is characterized in that the tail end of the first exciting winding is connected with the tail end of the compensation winding. By adopting the voltage regulating compensation connection method of the invention, the low-voltage compensation is complete compensation for the autotransformer of variable flux voltage regulation of a neutral point, so that low voltage fluctuation can bethoroughly solved when a transformer regulates the voltage.
Owner:CHINA XD ELECTRIC CO LTD

Power factor correction converter and power factor correction conversion equipment

An embodiment of the present invention discloses a PFC (Power Factor Correction) convertor and a PFC conversion device, belongs to the technical field of power supply rectification, and solves the technical problems in the prior art that conversion efficiency and power density are low. The PFC convertor comprises at least two sets of bidirectional switches, an autotransformer, a boost inductor, a bus filter capacitor, at least two front axle arms and a back axle arm, wherein a front end of the each set of bidirectional switch is respectively connected with a coil of the autotransformer one to one, a back end of the each set of bidirectional switch is used for connecting to one end of an AC input power network; a center tap of the autotransformer is connected with an output end of the boost inductor, an input end of the boost inductor is used for connecting to the other end of the AC input power network; the front end of the each set of bidirectional switch is respectively connected with the front axle arm, and the back end is connected to the back axle arm; and two ends of the front axle arm and the back axle arm are respectively connected with two ends of the bus filter capacitor correspondingly. The PFC conversion device comprises the PFC convertor. The present invention is applied to power supply rectification.
Owner:HUAWEI DIGITAL POWER TECH CO LTD
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