445 results about "Center tap" patented technology

A system for an electrified vehicle, such as a battery electric vehicle (BEV), includes an inverter configured to drive a motor having motor windings with electrical power from a battery according to a configuration of a power switch of the inverter. The system further includes a capacitor connected between a center-tap of the battery and a neutral-point of the motor winding whereby the capacitor and the motor windings form an LC circuit. The system further includes a controller configured to operate the power switch in a zero-current-switching mode with a switching frequency dependent on a resonant frequency of the LC circuit to thereby cause electrical current to circulate between the battery, the inverter, and the motor which heats the battery and the motor windings.

Wireless circuitry is provided that includes a transformer having a primary coil and a secondary coil, a first group of switchable capacitors coupled to a first terminal of the primary coil, a second group of switchable capacitors coupled to a second terminal of the primary coil, and capacitance measurement circuitry selectively coupled to a center tap of the primary coil during a measurement mode. The capacitance measurement circuitry can include a current source, a current sink, a comparator, a voltage generator for providing one or more threshold / reference voltages to the comparator, a frequency measurement circuit, and a capacitance calculation circuit configured to compute a capacitance of the first and second groups of switchable capacitors.

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 discloses a closed-loop transformer based on a single-core asymmetric phase-shifting transformer and a control method of the closed-loop transformer. The closed-loop transformer comprises a single-core asymmetric phase-shifting transformer bank and a voltage-regulating transformer bank. One end of a primary side winding of the single-core asymmetric phase-shifting transformer is connected with a three-phase power supply, and a center tap serves as the output end of the single-core asymmetric phase-shifting transformer and is connected with the primary side of the voltage regulating transformer. A secondary side winding of the single-core asymmetric phase-shifting transformer is in triangular connection; the other end of the primary side winding of the regulating transformer is grounded; a wire at one end of a secondary side winding of the regulating transformer is directly led out as an output end of the closed-loop transformer, and the other end is grounded. Compared with the prior art, the amplitude-phase decoupling adjustment of the voltage phasor difference on the two sides of the loop closing point can be realized, the control rule and the control mode are simple, the wiring mode is simple, the adjustment mode is flexible, the adjustment range is large, and the adjustment precision is high.

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.

1. Capacitive voltage testing device. 2.1. The invention relates to a capacitive voltage testing device with a capacitive voltage divider comprising a primary capacitor for coupling to a voltage to be measured at the measuring point and a secondary capacitor for coupling to a reference potential at the evaluation point, and an evaluation unit having a measurement signal input coupled to a center tap of the capacitive voltage divider. 2.2.The capacitive voltage testing device according to the invention comprises a multi-core test lead (4) with a first conductor (A1) and a second conductor (A2) electrically insulated from the first conductor (A1), which together form the primary capacitor (C1), wherein one (A1) of the two conductors (A1, A2) has a measuring voltage connection (5) on the measuring point side and an insulated connection (6) on the evaluation side, and the other conductor (A2) has an insulated connection (7) on the measuring point side and a center tap connection (8) on the evaluation side. 2.3. Use e.g. for voltage testing in low-voltage systems.

The utility model discloses an energy feedback type bipolar pulse drive circuit suitable for an excimer lamp. Comprising a direct-current power supply, a first resonant inductor (L1), a second resonant inductor (L2), a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7), an eighth diode (D8), a first resonant capacitor (C1), a second resonant capacitor (C2), a first power switch tube (Q1), a second power switch tube (Q2) and a boosting transformer with a center tap. The drive circuit disclosed by the utility model not only can generate high-frequency bipolar pulse excitation waveforms on the excimer lamp, but also is suitable for various loads in different forms, such as an ozone generator and the like.

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.

This application provides a hybrid powertrain. The hybrid powertrain includes a generator, a motor, a dual-motor controller, and a switch module. The dual-motor controller includes a generator power circuit and a motor power circuit. A running status of the switch module includes a first state and a second state. If the switch module is in the first state, the switch module is configured to connect to an end of a power battery and a center tap of a multiphase winding of the motor. If the switch module is in the second state, the switch module is configured to connect to an end of a power battery and an end of a plurality of switching transistor bridge arms of the motor power circuit. According to the hybrid powertrain and the control apparatus provided in this application entire vehicle endurance and power performance of the electric vehicle can be improved.

An electronic device may include wireless circuitry with a mixer. The mixer may include a transconductor with first and second input transistors, a switching quad with first and second pairs of mixer transistors, and a transformer coupled between the transconductor and the switching quad. The transformer may have a primary winding and a secondary winding. The transformer may have a conductive path that couples a center tap contact of the primary winding to a center tap contact of the secondary winding. The conductive path may configure the transformer to share a DC bias current between the transconductor and the switching quad. This may eliminate the need to bias the transconductor and the switching quad using different power supply voltages, thereby minimizing power consumption without sacrificing performance.

This application provides a motor controller for an electric vehicle. The motor controller includes a control circuit and an inverter circuit. The control circuit is configured to: in response to that the drive motor rotates with a pair of wheels of the electric vehicle, control a switch module to connect a center tap of the multiphase winding to the other end of the power battery, and control the inverter circuit to adjust a voltage at both ends of the bus capacitor. The bridge arms of the inverter circuit of the motor controller provided in this application and the winding of the drive motor form a voltage conversion circuit to adjust the voltage at both ends of the bus capacitor, to improve power performance and vehicle endurance of the electric vehicle.

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.

The invention discloses a switching power supply and an overvoltage protection method thereof, the switching power supply comprises a main power tube, a freewheeling tube, a center tap inductor and an overvoltage protection circuit, and the overvoltage protection circuit comprises an input sampling unit for sampling a voltage on a sampling point of the switching power supply to obtain an input sampling voltage representing an input voltage; and the overvoltage control unit is used for performing overvoltage protection on the switching power supply according to the duty ratio, the input sampling voltage and the reference voltage. The center tap inductor is connected with the main power tube and the follow current tube, the overvoltage protection threshold value is adjusted by adjusting the position of the center tap end in the center tap inductor, and the overvoltage protection threshold value is the output voltage when overvoltage protection is triggered. According to the overvoltage protection circuit, the center tap inductor is added in the switching power supply, and the position of the center tap end in the center tap inductor is randomly adjustable, so that an overvoltage protection threshold is continuously adjustable, the range of an overvoltage protection point is enlarged, the voltage protection range is widened, and the overvoltage protection capability is improved.

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.

An electronic device may include wireless circuitry having an on-chip transformer. The transformer may convey a radio-frequency signal and may include a primary coil and a secondary coil. The primary coil may have a center tap. A distributed capacitor array (DCA) may be coupled to the primary coil around the center tap. The DCA may include switchable capacitors coupled in parallel between ground and points on the primary coil on either side of the center tap. When active, each switchable capacitor contributes a different weighting to the operation of the transformer based on its distance from the center tap. A set of one or more of the switchable capacitors may be activated to contribute an asymmetric weighting to the operation of the transformer that mitigates process-related asymmetry in the transformer. This may serve to mitigate undesired common mode to direct mode signal conversion by the transformer.

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.

An electrified vehicle system, such as a battery electric vehicle (BEV), includes an inverter configured to drive a motor with motor windings, according to a configuration of the inverter's circuit breaker, using electrical power from a battery. The system also includes a capacitor connected between a center tap of the battery and a neutral point of the motor winding, forming a liquid-cooled (LC) circuit. Furthermore, the system includes a controller configured to operate the circuit breaker in a zero-current switching mode at a switching frequency dependent on a resonant frequency of the LC circuit. This causes electrical current to circulate between the battery, the inverter, and the motor, heating the battery and motor windings.

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 utility model provides an amplifier with multiple output ends, which comprises an amplifying circuit and a radio frequency switch switching circuit, and is characterized in that the amplifying circuit is configured to be a low-noise amplifying circuit with a cascode structure so as to receive a radio frequency input signal and provide the amplified radio frequency signal to the radio frequency switch switching circuit; the radio frequency switch switching circuit includes a center tap inductor and is configured to provide the amplified radio frequency signal to a plurality of output terminals of the amplifier through a center tap of the center tap inductor.

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 provides a multi-channel signal transformer bank. The multi-channel signal transformer bank comprises an insulating bottom plate and a plurality of transformers, the plurality of transformers are arranged on the insulating bottom plate; the transformer comprises a magnetic core, a primary coil and a secondary coil, wherein the primary coil and the secondary coil are wound on the magnetic core. A plurality of primary leading-out ends are led out from the primary coil through a center tap, and a plurality of secondary leading-out ends are led out from the secondary coil through a plurality of windings. According to the transformer bank, the plurality of transformers are arranged on the same insulating bottom plate, the structure is compact, the integration degree is high, the size of the whole transformer bank is reduced, and the signal processing efficiency is greatly improved. The primary coil adopts a center tapped mode, so that the effects of adjusting output voltage, preventing harmonic interference, providing a stable voltage source, reducing common-mode current / voltage and providing direct-current bias for Rx / Tx signals in the transformer can be effectively achieved; and the secondary coil adopts a multi-path winding so as to meet various converted voltage values in use, and the transmission efficiency of the transformer bank is improved.

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 band-pass filtering structure comprises a T-type inductor and a capacitance network, the T-type inductor is composed of a first inductor and a second inductor, one end of the second inductor is coupled to the center tap position of the first inductor, the other end of the second inductor is coupled to the reference ground, and the capacitance network is connected with the first inductor. The center tap divides the first inductor into two parts with equal effective inductance values, the capacitor network comprises a first resonant capacitor and a second resonant capacitor, the first resonant capacitor is coupled to one end of the first inductor, and the second resonant capacitor is coupled to the other end of the first inductor; the band-pass filter is provided with an inductor, a capacitor and a grounding layer, the inductor forms a T-shaped inductor, and the grounding layer and the capacitor provide a low-impedance grounding point to improve out-of-band performance; according to the T-type inductor, the scheme that two inductors are jointly designed to replace the scheme that three inductors are connected in series and combined is adopted, so that the layout area of a device is further reduced under the condition of the same working frequency.

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.