239 results about "Center tap" patented technology

A direct-current conversion circuit, which is used for providing direct-current conversion between a first direct-current voltage and a second direct-current voltage is described. The direct-current conversion circuit comprises: a transformer, which comprises a primary-side winding and a secondary-side winding, wherein the primary-side winding comprises a center tap, and a first primary-side winding and a second primary-side winding, which are respectively connected to the center tap; a primary-side circuit, wherein a first side of the primary-side circuit is connected to the primary-side winding, a second side of the primary-side circuit comprises a first end, a second end, and a third end, and a first direct-current voltage is provided between the first end and the second end of the primary-side circuit; and a secondary-side circuit, wherein a first side of the secondary-side circuit is connected to the secondary side winding.

A power converter, includes: a first terminal, a second terminal, a third terminal and a fourth terminal; stored-energy-source terminals, to which a stored energy source can be connected; four inverter bridge branches, which are formed from semiconductor switching devices, the inverter bridge branches each having a center tap, each center tap being assigned to one of the terminals, and the inverter bridge branches being interconnected and controllable such that electrical energy can be transferred bidirectionally between the stored-energy-source terminals and the first terminal, the second terminal, the third terminal and / or the fourth terminal; and a control unit, which is designed to control the semiconductor switching devices of the inverter bridge branches.

The invention discloses an ultra-wideband 180-degree phase shift circuit which comprises a radio frequency signal input end, a radio frequency signal output end, an ultra-wideband balun with a center tap and a stub compensation line, a first matching compensation network, a second matching compensation network, a differential signal switch selection circuit and a control circuit. The ultra-wideband balun can realize conversion between a single-ended signal and a differential signal in an ultra-wideband frequency range, a first differential output port of the ultra-wideband balun is connected with one end of the first compensation matching network, and a second differential output port of the ultra-wideband balun is connected with one end of the second compensation matching network; a first differential port of the differential signal switch selection circuit is connected with the other end of the first compensation matching network, and a second differential port of the differential signal switch selection circuit is connected with the other end of the second compensation matching network; and the control circuit is used for controlling the differential signal switch selection circuit to switch and output 0-degree and 180-degree radio frequency signals. According to the invention, low-error phase shift precision can be provided within the frequency range of 2-20GHz and the relative bandwidth of 160%.

The invention relates to an LLC resonant soft switching converter based on self-detection synchronous rectification and a control method thereof. The converter comprises an LLC resonance circuit, a secondary transformer with a center tap, a self-detection synchronous rectification circuit, an input filter circuit, an output filter circuit, an LLC resonance control circuit, a primary PFM drive circuit, an optocoupler isolation circuit, an output voltage sampling circuit and an operational amplifier compensation circuit. Switching tubes S1 and S2 in the primary PFM drive circuit adopt high-voltage MOS tubes, secondary synchronous rectifier tubes S3 and S4 adopt low-voltage MOS tubes, output voltage feedback control and secondary synchronous rectifier tube self-detection drive control are adopted, and the resonant soft switching converter with the 240V-300V input voltage range, the constant output of 28V / 300W and the full-load efficiency of 92% is realized. According to the invention, zero-voltage switching-on of the primary switch tube, zero-current switching-off of the secondary synchronous rectifier tube and accurate synchronous rectification control are realized, the loss of the rectifier circuit is reduced, the efficiency of the converter is improved, and the electromagnetic compatibility characteristic of the converter is optimized.

An isolation circuit arrangement may include an isolation barrier and may be configured to receive one or more input signals on a low voltage side and deliver one or more output signals on a high voltage side. The isolation barrier may include a first capacitor, arranged along a first input line, a second capacitor arranged along a second input line, electrically parallel to the first capacitor, and a first inductor having a first end that is coupled to a first electrode of the first capacitor and having a second end that is coupled to a first electrode of the second capacitor. The isolation barrier may further include a center tap, connected to the first inductor, and a second inductor that is inductively coupled to the first inductor and is arranged with a first output end and a second output end on a high voltage side of the isolation circuit arrangement.

A multi-level inverter using cascaded H-bridge modules, where each module can balance its at least two charge storage elements by means of voltage equalization. Modules are arranged in series into at least one cascade inverter phase with optional center taps, and modules communicate with a control unit by being addressed over at least one serial communication bus. Additional features that can be included in embodiments are the configuration of modules to react to multiple specific addresses in order to increase the maximum output voltage slew rate, metal circuit breaking springs to provide fusing within modules, and the ability to interconnect multiple physically distinct inverters into a single unit. This inverter is predominantly intended for electric vehicle applications, and the optional incorporation of a switching array allows the possibility for power transfer to or from a wide range of voltage sources including other inverters.

The invention discloses a voltage-controlled oscillator and a sub-sampling phase-locked loop, and relates to the technical field of phase-locked loops. The voltage-controlled oscillator comprises two negative resistance transistors and a three-layer coil structure; the three layers of coil structures are respectively a drain coil, a grid coil and a source coil from outside to inside; the gate coil and the drain coil are both of an octagonal structure, and the source coil is of a splayed structure; the drain coil, the source coil and the grid coil are all provided with center taps, the center tap of the source coil is connected with a power voltage module, the center tap of the drain coil is grounded, and the connection point of the center tap of the source coil and the power voltage module and the connection point of the center tap of the drain coil and the ground are located on the same side of the drain coil. And the two negative resistance transistors are positioned on the other side of the drain coil. According to the invention, automatic alignment of second harmonics in a wide frequency range is realized. And meanwhile, an extra chip area is not increased.

The invention relates to an electric drive system (1) for a vehicle, comprising two electric machines (3.1, 3.2), each electric machine having three stator windings (L1 to L6); a high-voltage battery (2); and two inverters (4.1, 4.2), each of which is designed to supply one of the electric machines (3.1, 3.2), wherein, in a boost mode, one of the inverters (4.1, 4.2) is designed as a boost stage for a negative high-voltage potential (HV-), and the other inverter (4.1, 4.2) can be operated as a boost stage for a positive high-voltage potential (HV-) for charging the high-voltage battery (2). Each inverter (4.1, 4.2) is designed as a three-level T-type inverter and has three half-bridges, each of which consists of a high-side switch (HS1 to HS6), designed as a semiconductor switch, and a low-side switch (LS1 to LS6), designed as a semiconductor switch, the center taps (M1 to M6) thereof being connected, in each case, to one of the stator windings (L1 to L6) and to a bidirectional switch (BDS1 to BDS6) composed of two semiconductor switches connected anti-serially to one another. A series circuit consisting of a first capacitor (C1, C3) and a second capacitor (C2, C4) is connected between a positive potential (P1+, P2+) and a negative potential (P1-, P2-) of each inverter (4.1, 4.2), the center tap (M) of said series circuit being connected to the bidirectional switches (BDS1 to BDS6) of the respective inverter (4.1, 4.2).

The invention discloses a self-voltage-sharing bipolar phase-shifted full-bridge converter based on a coupling inductor, which comprises a full-bridge circuit, a high-frequency transformer Tr, a leakage inductor Lk, a blocking capacitor Cb, a full-bridge rectifying circuit, filter inductors Lf1 and Lf2 and a bipolar output circuit, a leakage inductor and a blocking capacitor are connected in series and then connected to the primary side of the high-frequency transformer; the high-frequency transformer comprises a primary winding and a secondary winding with a center tap, and the secondary winding is connected with the full-bridge rectifier circuit; the invention further provides a control method of the bipolar phase-shifted full-bridge converter. The novel bipolar port self-voltage-equalizing method based on the coupling inductor is adopted, output port voltage balance under any load condition is achieved without adding any additional device and voltage-equalizing control, and the method has the advantages of being low in cost, easy to control and wide in adjusting range.

This invention belongs to the field of wireless communication technology. It provides a differential amplifier system and a method for improving common-mode stability. The invention uses a large decoupling capacitor C1 at the transformer center tap to provide AC ground, and a common-mode resistor R1 to improve the circuit's common-mode stability. Since the common-mode resistor R1 is not in the differential signal loop path, the use of common-mode resistor technology does not affect differential-mode performance. Because the required common-mode resistor value is small, this design occupies a small layout area. This invention solves the problem of low common-mode stability in differential amplifiers.

A method for detecting an initial position of an electric motor includes determining a delta voltage for each of three pairs of stator windings by sequentially energizing and de-energizing each pair. The delta voltage is measured via an unenergized stator winding connected to the center tap of each corresponding pair. A minimum delta voltage is determined based on the absolute value of the minimum of the three delta voltages. The minimum delta voltage is associated with a remaining stator winding not included in the corresponding pair. Two delta voltages not associated with the minimum delta voltage are compared to determine the proximity of the remaining stator winding to one of the D-axis and the Q-axis of the rotor of the electric motor.

This invention discloses a millimeter-wave broadband high harmonic suppression tripler, comprising an input matching network, a time-domain shaping tripler unit, and a differential common-source output stage. The proposed time-domain shaping tripler unit employs transistor pairs with different gate widths and bias voltages to superimpose two sets of voltage signals of different amplitudes in the time domain, thereby enhancing the inherent harmonic suppression of the tripler unit. Furthermore, by connecting a common-mode impedance control in series at the center tap of the primary inductor coil of the output transformer of the tripler unit, the output power of the third harmonic is further improved. The input matching network achieves single-ended to differential conversion, with its primary and secondary coil center taps grounded and open-circuited respectively in a counterintuitive manner, improving differential-mode balance and common-mode stability. Simultaneously, by using a series-coupled inductor, the quality factor of the transistor input impedance is reduced, improving the bandwidth performance of the tripler.

The invention relates to a method for heating a high-voltage battery (2) of a high-voltage system (1) of an electrically powered vehicle, wherein the high-voltage system (1) comprises an inverter (4) and at least one capacitor (C_X1, C_X2) in an intermediate circuit, wherein the inverter (4) has two high-voltage potentials (P+, P-) as DC voltage terminals and three phase terminals to which an electric machine (3) is connected, wherein the inverter (4) has a plurality of semiconductor switches (S1 to S12), wherein energy is transferred between the high-voltage battery (2) and the at least one capacitor (C_X1, C_X2) using the semiconductor switches (S1 to S12), the at least one capacitor (C_X1, C_X2) and the motor inductances (L1, L2, L3) of the electric machine (3), wherein the inverter (4) is designed as a 3-level inverter, and wherein the intermediate circuit is a series connection of two Capacitors (C_X1,C_X2) with a center tap (M) connected to the inverter (4), wherein energy is alternately transferred between the two capacitors (C_X1, C_X2) using the semiconductor switches (S1 to S12) of the inverter (4) in order to cause a correspondingly reversing current flow between the high-voltage battery (2) and the capacitors (C_X1, C_X2) and thus to heat the high-voltage battery (2).

A method for ancillary supply in a modular multi-level converter with a plurality of modules arranged in strands, a respective module including at least two half bridges with semiconductor switches and at least one energy accumulator, which are interconnected in parallel. In the respective module, an at least single-core input terminal is formed through respective center tapping in at least one half bridge on an input side, and an at least single-core output terminal is formed through respective center tapping in at least one half bridge on an output side. The strands are interconnected into at least one star point on the at least single-core input terminal of a first module in the respective strand. A respective phase of a supply voltage in a high-voltage system is formed on the at least single-core output terminal of a last module in the respective strand.

The utility model relates to the technical field of electronic power, in particular to a positive and negative voltage output circuit based on coreless transformer isolation, which comprises a cross-coupled oscillation circuit, a coreless transformer and a rectification filter circuit, the cross-coupled oscillation circuit generates sine wave oscillation, and energy is transmitted to a secondary coil through a primary coil of the coreless transformer. The secondary coil adopts a center tap structure, the rectification filter circuit receives signals transmitted by the secondary coil, and stable positive and negative voltage output is realized through rectification and filtering processing. High-efficiency energy transmission is realized through the coreless transformer, the voltage isolation capability is improved, electromagnetic interference is reduced, and the coreless transformer has the advantages of compact structure, low cost, high power density and the like, and is suitable for solid-state switch driving, high-frequency power conversion and other electronic power systems.

The utility model relates to a television signal data transmission technology. The 5-2400MHz broadband distributor provided with the micro-strip type distributed capacitor comprises a surface PCB (Printed Circuit Board), a first magnetic core coil B1, a second magnetic core coil B2, a first blocking capacitor C1, a fourth blocking capacitor C4, a third blocking capacitor C3, a first magnetic core coil B1, a second magnetic core coil B2 and a distributed micro-strip capacitor 3, the double-sided PCB comprises a PCB bottom layer, an insulating layer and a PCB top layer which are sequentially arranged from bottom to top, the PCB bottom layer is provided with a transmission line ground, and the PCB top layer is provided with a signal input IN, a first signal output OUT1, a second signal output OUT2, a transmission line and a microstrip distributed capacitor. A signal is input to the first magnetic core coil B1 through IN and is output to the microstrip distributed capacitor through a center tap of the first magnetic core coil B1. And then the signals are distributed to the OUT1 and the OUT2 through the second magnetic core coil B2 to be output, so that broadband signal distribution is realized.

Embodiments herein disclose an inductor-capacitor voltage controlled oscillator (LC-VCO) circuit. The LC-VCO circuit includes: an LC tank circuit including a center tap inductor connected in parallel with a capacitor bank without a varactor, where the LC tank circuit resonates to generate an oscillation voltage; and a control circuit connected to a varistor capacitance circuit, where the varistor capacitance circuit includes a varistor based on a voltage controlled transistor in series with at least one capacitor, the varistor capacitance circuit is connected in parallel with the LC tank circuit and connected to a negative transconductance circuit. The control circuit includes an error amplifier and a conversion circuit, and is configured to generate an output control voltage based on an input phase-locked loop (PLL) control voltage that controls a capacitance value of the varistor capacitance circuit through the variable resistor.

An inductor device includes an 8-shaped inductor and a ring-type wire. The ring-type wire is disposed around an outer side of the 8-shaped inductor. The 8-shaped inductor includes an input terminal and a center-tapped terminal. The input terminal of the 8-shaped inductor is located on a first side of the inductor device, and the center-tapped terminal is located on a second side of the inductor device. The ring-type wire includes an input terminal and a ground terminal. The input terminal of the ring-type wire is located on the first side of the inductor device, and the ground terminal is located on the second side of the inductor device. The input terminal of the ring-type wire is coupled to the input terminal of the 8-shaped inductor.

A multi-level inverter using cascaded H-bridge modules, where each module can balance its at least two charge storage elements by means of voltage equalization. Modules are arranged in series into at least one cascade inverter phase with optional center taps, and modules communicate with a control unit by being addressed over at least one serial communication bus. Additional features that can be included in embodiments are the configuration of modules to react to multiple specific addresses in order to increase the maximum output voltage slew rate, metal circuit breaking springs to provide fusing within modules, and the ability to interconnect multiple physically distinct inverters into a single unit. This inverter is predominantly intended for electric vehicle applications, and the optional incorporation of a switching array allows the possibility for power transfer to or from a wide range of voltage sources including other inverters.

The invention discloses a dual-active-bridge converter for low voltage and high power and a control method thereof, and belongs to the technical field of dual-active-bridge converters, and the dual-active-bridge converter comprises a low-voltage full-bridge switch, a high-voltage full-bridge switch, a high-frequency transformer, a boost inductor LBoost, an external series inductor Lseries, a low-rated-current clamping diode Dclamp1 and a low-rated-current clamping diode Dclamp2. The power supply is connected in parallel with the filter capacitor CLV; the filter capacitor CLV is connected in series with the boost inductor LBoost, and the other end of the boost inductor LBoost is connected with a common node of the low-voltage full-bridge switch; the secondary side of the high-frequency transformer is led out through a center tap, the upper portion and the lower portion of the high-frequency transformer are connected with a low-rated-current clamping diode Dclamp1 and a low-rated-current clamping diode Dclamp2 respectively, and meanwhile one end of the secondary side of the high-frequency transformer is connected with an external series inductor Lseries and then connected with the high-voltage full-bridge switch. The dual phase shift modulation (DPSM) can improve the performance of the converter under light load, and has the advantages of few components, simple circuit and the like.

The invention discloses a bidirectional resonant DC-DC converter based on partial power voltage regulation, and belongs to the technical field of bidirectional DC-DC converters. The converter comprises direct-current voltage sources V1 and V2, a high-frequency transformer T, an input inductor Lin, resonant inductors Ld1 and Ld2, excitation inductors Lm1 and Lm2, a filter inductor Lf, a resonant capacitor Cr, filter capacitors Co1, Co2 and Co3, and power tubes S1, S2, S3, S4, S5, S6, S7 and S8. The converter is composed of a main body circuit resonance current type push-pull / SRC bidirectional converter and a partial power voltage regulating circuit non-isolated DC-DC converter. The main body circuit resonance current type push-pull / SRC bidirectional converter works in a DCX mode to forward transmit the total power to the secondary side from the primary side of the high-frequency transformer T or reversely transmit the total power to the primary side from the secondary side of the high-frequency transformer T; a non-isolated DC-DC converter of the partial power voltage regulation circuit is cascaded with a center tap of a secondary side of a high-frequency transformer of a resonance current type push-pull / SRC bidirectional converter of the main body circuit, so that efficient transmission of energy and wide-range voltage regulation can be ensured, and bidirectional transmission of power can be realized at the same time.

Provided is a phase-shifted full bridge center-tapped converter with a protection circuit. The converter includes a primary side circuit having a full bridge structure and a secondary side circuit having a center-tap structure. The converter further includes a protection circuit configured to transfer energy from the secondary side circuit to the primary side circuit, based on an operation stop.

The invention discloses a transformer balun, relates to the technical field of integrated circuits, and discloses the transformer balun which comprises a primary coil and a secondary coil. One end of the primary coil is grounded to form a single-end port, and a grounding inductor is arranged on a first center tap in the primary coil; and two ends of the secondary coil jointly form a differential port. Namely, the grounding inductor is added to the first center tap in the primary coil of the transformer balun, so that a transmission zero point can be constructed for an even-mode half-side circuit in a broadband range, and the balance degree of the transformer balun is further improved.

A wireless circuit is provided that includes at least a first amplifier, a second amplifier, and a power distribution transformer coupled to the first amplifier and the second amplifier. The first amplifier may include a first input transistor, and the second amplifier may include a second input transistor. The power distribution transformer may include: a primary coil; a first secondary coil having a terminal coupled to a gate terminal of the first input transistor and having a center tap configured to receive a first bias voltage; and a second secondary coil having a terminal coupled to the gate terminal of the second input transistor, and having a center tap configured to receive a second bias voltage. The first amplifier and the second amplifier may output a signal to a power combining transformer. The power combination transformer may have a first primary coil, a second primary coil, and a secondary coil all disposed within a single compact transformer footprint.

An RF differential system comprises an RF differential circuit and a winding connected to the RF differential circuit. The winding has a center tap. A bias terminal is provided to receive a bias signal. A suppression network is connected between the center tap and the bias terminal.

The invention discloses a tap interleaving type isolation bidirectional high-gain DC-DC converter, and the converter comprises a tap interleaving boost unit which comprises an input capacitor, a first inductor, a second inductor, a third inductor, a first switching tube, a second switching tube, a third switching tube, a low-voltage source, and a center tap transformer; the synchronous rectification unit comprises a blocking capacitor, a fourth switching tube, a fifth switching tube, an output capacitor and a high-voltage source; and the tapped interleaved boost unit is connected with the synchronous rectification unit. According to the converter, high-gain boost conversion from a low-voltage source to a high-voltage source can be achieved through the tapped interleaved boost unit and the synchronous rectification unit, high-gain buck conversion from the high-voltage source to the low-voltage source can also be achieved, input current ripples of the converter are small, the structure is simple, and implementation is easy.

The invention belongs to the technical field of avionics testing and signal simulation, and discloses an LVDT analog simulation circuit and a signal simulation method thereof, and the LVDT analog simulation circuit comprises a main control module, a communication interface module, an excitation signal processing module and a sensor signal simulation output module. The main control module receives an external displacement setting instruction through the communication interface; the excitation signal processing module comprises a DAC unit and an excitation conditioning unit and is used for generating amplitude control voltage and conditioning an external LVDT excitation signal; the sensor signal simulation output module serves as a core and comprises a difference value control unit, a sum value control unit, a summation unit and a differencing unit, a conditioned excitation signal and amplitude control voltage are synthesized through an analog multiplier and an operational amplifier circuit, and finally three-phase differential signals (a high end, a low end and a center tap) simulating a real LVDT sensor are output. A mechanical LVDT is replaced by a full-electronic mode, high-precision, programmable and flexible simulation of displacement signals is achieved, the device is particularly suitable for occasions needing high-reliability LVDT interface testing and verification such as an aviation flight control system, and the device has the advantages of being low in cost, high in flexibility and easy to integrate automatic testing.

A single phase induction motor of a scroll compressor includes: a main winding that is center tapped forming: a first winding having a first end and a second end; a second winding having a third end and a fourth end; and a node between the second end of the first winding and the third end of the second winding; a first switch: including a first input to receive single phase power from a source; including a first output connected to the first end of the first winding; and including a second output; a second switch: including a second input connected to the second output of the first switch; including a third output connected to the node between the second end of the first winding and the third end of the second winding; and an auxiliary winding.

This suppresses stress on the switching element, enabling pre-charging in a short time. [Solution] A transformer including a first switching element with one end connected to a first terminal, a second switching element connected between the other end of the first switching element and a second terminal, a third switching element with one end connected to the first terminal, a fourth switching element connected between the other end of the third switching element and a second terminal, a first winding connected between the other end of the first switching element and the other end of the third switching element, and a second winding magnetically coupled to the first winding; an inductor section connected between the center tap of the second winding and a third terminal; a fifth switching element connected between one end of the second winding and a fourth terminal; a sixth switching element electrically connected between the other end of the second winding and a fourth terminal; a first switch connected between one end of the fifth switching element and a third terminal; and a second switch connected between one end of the sixth switching element and a third terminal.

This invention discloses a bidirectional bipolar input / output DC-DC converter topology, which is an asymmetric structure centered on a high-frequency transformer T1 with a center tap. It includes a first circuit unit, the high-frequency transformer T1, and a second circuit unit connected in sequence. The first circuit unit employs a half-bridge or full-bridge structure, and the second circuit unit also employs a half-bridge or full-bridge structure. At least one of the first and second circuit units uses a bidirectional switching structure with two switches connected in reverse series, enabling mutual conversion between the bipolar voltages of the first and second circuit units, thus multiplying the voltage variation range on the output side. This invention improves upon traditional bipolar DC-DC converters, achieving stable and adjustable voltage gain by changing the switching frequency while realizing high-frequency, high-efficiency bipolar DC-DC conversion, significantly improving the converter's wide-range voltage supply capability.