296 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.

The invention provides a voltage amplifier and a preparation method thereof, which can be applied to the technical field of voltage amplifiers. The voltage amplifier method includes: a noise matching transformer including a primary winding, a secondary winding, and a magnetic core, the noise matching transformer being configured with a target number of turns of the primary winding and a target number of turns of the secondary winding, thereby reducing noise of the active amplifier, the target number of turns of the primary winding is determined according to at least one of the first number of turns and the second number of turns, the target number of turns of the secondary winding is determined according to the signal source resistance, the resistance of the primary winding and the single-turn average resistance of the secondary winding, and the primary winding comprises a first tap and a second tap, the secondary winding comprises a positive tap, a negative tap and a center tap; the active amplifier is used for amplifying the signal source voltage according to the gain of the active amplifier, and the gain of the active amplifier is determined according to the target number of turns of the primary winding and the target number of turns of the secondary 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.

The invention 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, and is characterized in that 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 achieved through the coreless transformer, the voltage isolation capacity is improved, electromagnetic interference is reduced, and the coreless transformer has the advantages of being compact in structure, low in cost, high in power density and the like and is suitable for solid-state switch driving, high-frequency power conversion and other electronic power systems.

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.

The invention relates to a DC / DC converter (1) for charging a battery (4) in a boost mode, wherein the DC / DC converter (1) has a primary side (P) and a secondary side (S), wherein on the primary side (P) and on the secondary side (S) a capacitance (CX_P, CX_S) is electrically coupled between a respective positive potential (HV+1, HV+2) and a respective negative potential (HV-1, HV-2), wherein - the primary side (P) and the secondary side (S) each have at least two half-bridges (HB1, HB2, HB3, HB4), each with a high-side switch designed as a semiconductor switch (S1, S3, S5, S7, D) and a low-side switch designed as a semiconductor switch (S2, S4, S6, S8), - LC resonant circuits (2.1, 2.2) designed as series resonant circuits are arranged between center taps of the half-bridges (HB1, HB2) on the primary side (P) and center taps of the half-bridges (HB3, HB4) on the secondary side (S), wherein exactly one of the potentials (HV+1, HV-1) of the primary side (P) is galvanically connected to the opposite pole potential (HV-2, HV+2) of the secondary side (S), wherein the other potential (HV-1, HV+1) of the primary side (P) is galvanically connected to a same pole battery terminal of the battery (4).

Wireless circuitry is provided that includes at least a first amplifier, a second amplifier, and a power splitting transformer coupled to the first and second amplifiers. The first amplifier can include first input transistors, and the second amplifier can include second input transistors. The power splitting transformer can include a primary coil, a first secondary coil having terminals coupled to gate terminals of the first input transistors and having a center tap configured to receive a first bias voltage, and a second secondary coil having terminals coupled to gate terminals of the second input transistors and having a center tap configured to receive a second bias voltage. The first and second amplifiers may output signals to a power combining transformer. The power combining transformer can have a first primary coil, a second primary coil, and a secondary coil all disposed within a single compact transformer footprint.

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.

A power converter includes a first bridge arm including a first switch and a second switch connected in series such that the first switch is connected to the second switch to define a first connection point, a second bridge arm including a third switch and a fourth switch connected in series such that the third switch is connected to the fourth switch to define a second connection point, a first LC resonant cavity connected between the first connection point and the second connection point, a first rectifier and a second rectifier including switches, and a coupling inductance connected to the second switch, the third switch, the first rectifier and the second rectifier respectively, such that a center tap of the coupling inductance is connected to a load.

The invention relates to a DC / DC converter (1) comprising: - a primary side (P) with at least two half-bridges (HB1, HB2), each with a high-side switch designed as a semiconductor switch (S1, S3) and a low-side switch designed as a semiconductor switch (S2, S4), - a secondary side (S) with at least two half-bridges (HB3, HB4), each with a high-side switch designed as a semiconductor switch (S5, S7, D) and a low-side switch designed as a semiconductor switch (S6, S8, D), - at least one LC resonant circuit (2.1, 2.2) designed as a series resonant circuit, which is arranged between a center tap of one of the half-bridges (HB1, HB2) on the primary side (P) and a center tap of one of the half-bridges (HB3, HB4) on the secondary side (S), - at least one further LC resonant circuit (2.1, 2.2) designed as a series resonant circuit or a capacitor (C1, C2) which is arranged between a center tap of another of the half-bridges (HB1, HB2) on the primary side (P) and a center tap of another of the half-bridges (HB3, HB4) on the secondary side (S).

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 a low noise amplifier circuit and a low noise amplifier. The low noise amplifier circuit comprises a balun used for converting a radio frequency signal into a first input signal and a second input signal; the first cross coupling capacitor unit is connected with the output end of the balun and is used for respectively obtaining a first intermediate signal and a second intermediate signal according to the first input signal and the second input signal; the second cross coupling capacitor unit is connected with the output end of the first cross coupling capacitor unit and is used for respectively obtaining a first output signal and a second output signal according to the first intermediate signal and the second intermediate signal; the load inductor is connected with the second cross coupling capacitor unit, one end of the load inductor is used for receiving the first output signal, the other end of the load inductor is used for receiving the second output signal, and a center tap of the load inductor is used for receiving the working voltage. According to the low-noise amplifier circuit and the low-noise amplifier, a lower noise coefficient can be realized.

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).

A voltage controlled oscillator includes a cross coupled pair circuit, a first capacitive circuit, a first inductor, a second inductor, a second capacitive circuit and a first switch circuit. The first capacitive circuit is arranged in parallel with the cross coupled pair circuit. The first inductor is arranged in parallel with the cross coupled pair circuit and has a center tapped node for receiving a power supply voltage. The second inductor is magnetically coupled with the first inductor and has a center tapped node for receiving a first control voltage. The second capacitive circuit is arranged in parallel with the second inductor. The first switch circuit is arranged in parallel with the second inductor and configured to be turned on or turned off by a second control voltage. The first control voltage and the second control voltage change synchronously.

The invention relates to an electric drive system (1) for a vehicle, having two electric machines (3.1, 3.2) each having three stator windings (L1 to L6), a high-voltage battery (2) and two inverters (4.1, 4.2) for supplying one of the electric machines (3.1, 3.2) each, wherein in boost operation one of the inverters (4.1, 4.2) can be operated 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), wherein the inverters (4.1, 4.2) are each designed as a three-level T-type inverter and each have three half-bridges, each of which is formed from 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, to the center taps (M1 to M6) of which one of the stator windings (L1 to L6) and a bidirectional switch (BDS 1 to BDS 6) made up of two semiconductor switches connected anti-serially to one another are connected, wherein a series circuit comprising 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), to the center tap (M) of which the bidirectional switches (BDS1 to BDS6) of the respective inverter (4.1, 4.2) are connected.

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.

A power converter includes a first bridge arm connected between an input power supply and a reference potential, the first bridge arm including a first switch and a second switch connected at a first connection point, a second bridge arm connected in parallel with the first bridge arm between the input power supply and the reference potential, the second bridge arm including a first capacitor and a second capacitor connected at a second connection point, a coupling inductance connected between the first and second connection points, where a center tap of the coupling inductance is connected to a load, and a first resonant inductor connected in series with the coupling inductance between the first and second connection points, the first resonant inductor defining a series resonant circuit with each of the first capacitor and the second capacitor.

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.