499 results about "Balanced circuit" patented technology

A circular-polarization dipole helical antenna is used for electronic device and satellite terminal and includes a base, and an antenna conductor arranged on surface of the base. The antenna conductor includes a plurality of metal conductors with high Q value and anti-oxidation property and continuously and helically coated on surface of the base. The base is made of low loss and high dielectric constant material. An unbalance-to-balance circuit module connects two signal-feeding ends to the base with phase difference of 180 degree. The problems of narrow bandwidth, low efficiency, complicated structure and precise manufacture can be solved.

One embodiment of the film acoustically-coupled transformer (FACT) includes a decoupled stacked bulk acoustic resonator (DSBAR) having a lower film bulk acoustic resonator (FBAR) an upper FBAR stacked on the lower FBAR, and, between the FBARs, an acoustic decoupler comprising a layer of acoustic decoupling material. Each FBAR has opposed planar electrodes with a piezoelectric element between them. The FACT additionally has first terminals electrically connected to the electrodes of one FBAR and second terminals electrically connected to the electrodes of the other FBAR. Another embodiment has decoupled stacked bulk acoustic resonators (DSBARs), each as described above, a first electrical circuit interconnecting the lower FBARs, and a second electrical circuit interconnecting the upper FBARs. The FACT provides impedance transformation, can linking single-ended circuitry with balanced circuitry or vice versa and electrically isolates primary and secondary. Some embodiments are additionally electrically balanced.

A battery with a battery balancing assembly that regulates the discharge of battery cell charge and a method of evenly discharging battery cells, the battery comprising a plurality of cells. The balancing assembly includes switches disposed between the cells such that the switches may configure the cells in a normal configuration and a balance configuration, wherein in the normal configuration the plurality of cells may be connected to an electronic device and wherein in the balance configuration the plurality of cells are connected to a balancing circuit. The balancing circuit serving to balance the charge in the plurality of cells prior to the recharging of the cell.

A battery system in which module batteries, each of which includes cell batteries connected in series, are connected to one another. Each of the module batteries includes: a cell voltage detection / inter-cell balancing circuit that detects a cell voltage of each of the cell batteries to then create a cell voltage signal, and balances energies among the cell batteries based on the created cell voltage signal; and an inter-module balancing circuit that balances energies among the module batteries based on a module voltage obtained by summing up the cell voltages of the cell batteries.

A method and apparatus for warming up cold temperature lithium chemistry batteries employs a temperature sensor configured to generate a temperature signal indicative of a temperature of the cells of a multi-cell battery. The cells are coupled to a respective balancing circuit having a dissipative resistor that is selectively shunted across the cell for dissipating charge to achieve cell-to-cell balancing. When the temperature is below a temperature threshold, the battery controller engages the balancing resistors to dissipate energy and generate heat to warm up the cells. The cold-temperature shunting is discontinued when a warm-up threshold is reached.

A driving circuit uses a plurality of transformers to provide currents for driving a plurality of LEDs associated with a plurality of current paths. Each transformer has two induction coils with a coil turn ratio between to the number of turns in each induction coil. One induction coil is used to provide an output current to a different current path and the other induction coil is connected to the corresponding induction coil of other transformers for forming a current loop. The output current of each transformer has a relationship with the output current of the other transformers depending on the coil turn ratios of the connected transformers. LEDs in red, blue and green colors can be connected to different current paths so that the brightness of the LEDs in each color can be determined by the current in a current path.

A maximum / minimum voltage detector detects a maximum terminal voltage and a minimum terminal voltage of a plurality of accumulators. A voltage difference calculator calculates a voltage difference between the maximum terminal voltage and the minimum terminal voltage. A timer setting unit sets an operational time of a timer according to the voltage difference. An operational time controller presets the operational time in the timer to temporally control the operation of the voltage balanced circuit. Accordingly, an unnecessary loss of energy due to the long time operation of the voltage balance circuit is prevented, and a performance of the assembled battery is maintained.

A balancing circuit for a plurality of series connected cells or substrings of cells is provided. In one implementation, the balancing circuit includes a plurality of primary ports; an isolated secondary port; and one or more DC-DC converters connected between the primary ports and the isolated secondary port. Each DC-DC converter includes at least one power switch. The DC-DC converters are configured to adjust a primary port current received at one or more of the plurality of primary ports based upon a difference between a voltage at the one of the primary ports and a reference voltage. Also provided are an electrical power system including such as balancing circuit and a method of balancing a plurality of electric cell substrings using such a balancing circuit.

A radio frequency (RF) transceiver front-end includes an antenna, an RF receiver section, an RF transmitter section, a balancing circuit, and a multiple node isolation and coupling circuit. The multiple node isolation and coupling circuit is coupled to the antenna, the RF receiver section, the RF transmitter section, and the balancing circuit. The multiple node isolation and coupling circuit provides an inbound RF signal from the antenna to the RF receiver section and provides an outbound RF signal from the RF transmitter section to the antenna, wherein, by providing an isolating signal to the balancing circuit, the multiple node isolation and coupling circuit substantially isolates the outbound RF signal from the inbound RF signal.

A light source driving device drives a plurality of light sources. A Power Factor Circuit (PFC) circuit converts a received electrical signal to a DC signal and output to a DC / AC converting circuit. The DC / AC converting circuit converts the DC signal to another AC signal, which is isolated by the transformer circuit. A resonance balancing circuit converts the AC signal output from the transformer circuit to another AC signal to drive the light source module. A PWM dimming controller outputs a control signal to control output of the DC / AC converting circuit according to a received dimming signal, wherein duty cycle of the control signal is fixed. A voltage dividing circuit adjustably divides voltage of the DC signal output from the PFC circuit. A PFC controller feeds the divided signal back to the PFC circuit to control the DC signal output from the PFC circuit.

A system for balancing energy delivery devices within the one or more battery packs and for providing isolated monitoring of the battery packs includes at least one group of energy delivery devices electrically connected in series. For each group of energy delivery devices, the system includes a balancing circuit for each adjacent pair of energy delivery devices. The balancing circuit adjusts charge stored in each energy delivery device of the pair so that the charge stored in the energy delivery devices of the pair is substantially equal, and the charge stored in each energy delivery device remains above a threshold. The system also includes a voltage monitoring module for sequentially selecting each of the energy delivery devices and providing a voltage associated with the selected device at an output port. The voltage monitoring module uses a low on-resistance differential multiplexer to select each of the energy delivery devices.

Battery equalization circuits for series charging / discharging and controlling methods thereof are provided. The provided circuit includes a set of series-connected batteries, a switching converter and a magnetic element coupled balance circuit including a magnetic element coupled to the switching converter, wherein the magnetic element takes a branch current from the switching converter to the series-connected batteries so as to cause the set of series-connected batteries to reach a balance.

Provided is a battery cell balancing circuit including: a battery cell module including a plurality of battery cells connected in series; a series resonant circuit including an inductor unit and a capacitor unit which are connected in series so as to store electric energy recovered from a corresponding battery cell of the battery cell module and supply the stored electric energy to a corresponding battery cell of the battery cell module; and a switch unit configured to provide an electric energy recovery path for storing the electric energy recovered from the corresponding battery cell of the battery cell module into the capacitor unit of the series resonant circuit and provide an electric energy supply path for supplying the stored electric energy to the corresponding battery cell of the battery cell module.

According to an example embodiment, a battery system includes: a plurality of modules, each including a plurality of cells connected to each other in series and a cell balancing circuit performing a balancing operation between the plurality of the cells based on voltages of the plurality of the cells; and a module balancing circuit performing a balancing operation between the modules based on voltages of the modules.

One embodiment of the acoustically-coupled transformer includes a stacked bulk acoustic resonator (SBAR) having a stacked pair of film bulk acoustic resonators (FBARs) with an acoustic decoupler between them. Each FBAR has opposed planar electrodes with piezoelectric material between them. The transformer additionally has first terminals electrically connected to the electrodes of one FBAR and second terminals electrically connected to the electrodes of the other FBAR. Another embodiment includes first and second stacked bulk acoustic resonators (SBARs), each as described above, a first electrical circuit connecting one FBARs of the first SBAR to one FBAR of the second SBAR, and a second electrical circuit connecting the other FBAR of the first SBAR to the other FBAR of the second SBAR. The transformer provides impedance transformation, can linking single-ended circuitry with balanced circuitry or vice versa and electrically isolates primary and secondary. Some embodiments are additionally electrically balanced.

A method and apparatus for coupling an xDSL transceiver with a subscriber line is disclosed. A hybrid circuit is disclosed which exhibits a different relative gain factor for transmitted signals and received signals. The difference in gain factors results in part from a combined balance circuit and transformer which exhibit a different coupling ratio between the primary and secondary coils on the receive path and the transmit path. The hybrid circuit may be used to isolate the receive signal from the transmit signal in the full duplex mode of operation. The gain from the transmit port to the receive port is minimum and most of the energy is transmitted to the subscriber line.In an embodiment of the invention a hybrid circuit for communicating a transmit signal and a receive signal across a subscriber line is disclosed. The hybrid circuit includes: a transformer and a balance circuit. The transformer includes a primary inductor and a secondary inductor and the secondary inductor for coupling to the subscriber line and the primary inductor including at least two inductive portions. The balance circuit includes a transmit interface to input the transmit signal and a receive interface to output the receive signal, and the balance circuit coupling both the transmit interface and the receive interface with the at least two inductive portions of the primary to change the relative magnitude of an induced emf between the primary and the secondary for the transmit signal and the receive signal. In an alternate embodiment of the invention a method for communicating a transmit signal and a receive signal across a subscriber line is disclosed.

A galvanically isolated charge balance system for a multicell battery includes a balancing circuit associated with each cell; each balancing circuit including a flying capacitor; a variable conductance switch; and a biasing circuit for the variable conductance switch; and a galvanically isolating MEMS switching device for selectively connecting the flying capacitor to a voltage supply to charge it to a predetermined voltage and to the biasing circuit for setting the variable conductance switch to adjust the charge on its associated cell to a preselected level.

The present invention provides an oscillator or PLL circuit which can balance the characteristics of a circuit without being affected by noise from a signal line or a supply line. The present invention provides an oscillator comprising a resonance circuit has a first series connected circuit having coils and a power terminal, a second series connected circuit having capacitors and a varactor having directional characteristics, and a third series connected circuit having capacitors and a varactor having directional characteristics. The first, second, and third series connected circuits are connected in parallel. The varactors are connected so as to have opposite directionalities with respect to a connection side of the second and third series connected circuit. The capacities of the varactors are varied by external control. The varied capacities determine an oscillation frequency.

Rechargeable battery array is described. The rechargeable battery array is constructed from: a battery row 101 that includes a plurality of battery cells 102, 103 connected in parallel for supplying a larger current; and at least one balancing circuit 105 in the battery row, the balancing circuit provides a high impedance path across that battery row initially when charging process begins, and provides a path of desired constant voltage drop across that battery row when voltage across that battery row rises close to the charge termination voltage. The rechargeable battery array may further include a plurality of the battery rows 101, 111, 121 connected in series for supplying a higher voltage; and at least one balancing circuit 105 for each of the battery rows 101, 111, 121. The rechargeable battery array may also have at least one balancing circuit on each battery cell that is responsive to the voltage across that battery cell. The rechargeable battery array can be efficiently charged despite of capacity mismatch and / or failure in certain battery cells in the array.

The invention discloses a balanced radio frequency electrically tunable bandpass filter with constant relative bandwidth. The bandpass filter consists of an upper-layer microstrip structure, a middle-layer dielectric substrate, and a lower-layer grounded metal. The upper-layer microstrip structure is a balanced circuit, and comprises four half-wavelength resonators, two input feed networks, two output feed networks, two input ports and two output ports; the four half-wavelength resonators respectively consist of microstrip lines and variable capacitance diodes connected at two ends; the middle of the first half-wavelength resonator is connected with a capacitor and a microstrip line; the middle of the third half-wavelength resonator is connected with a capacitor; the second and fourth half-wavelength resonators are bent and symmetrical vertically; and the whole filter structure is in vertical mirror symmetry. The balanced radio frequency electrically tunable bandpass filter realizes constant relative bandwidth when a center frequency is tuned, can inhibit common-mode interference and can be used for a reconfigurable radio frequency front end for wireless communication.

A multiple-CCFL parallel driving circuit and the associated current balancing control method for LCD are presented, wherein the circuit comprises a plurality of CCFLs for providing the backlight for a LCD; a boosting transformer with a plurality of outputs for providing the driving voltage and current for driving the plurality CCFLs; a plurality of ballast capacitors, the ballast capacitors connect between the boosting transformer and the CCFLs; and a multiple CCFL current balancing circuit. This invention uses a low cost current mirror circuit to equalize the driving current of a plurality of CCFLs and thus significantly improve the uniformity of the displayed image on a large-size LCD.

The present invention relates to a balanced circuit arrangement and methods for linearizing and calibrating such a circuit arrangement wherein linearization is obtained by introducing a load imbalance between the output branches of the balanced circuit arrangement. Thus, a controllable extraneous imbalance is created between the output loads of the balanced circuit arrangement to thereby obtain a linearization by means of even-order non-linearity.

A power converter includes an input stage connected to receive a three phase AC input voltage and to provide multiple DC voltage levels. The power converter also includes an output stage of a plurality of interleaved LLC converters having series-connected inputs coupled to the multiple DC voltage levels and parallel-connected outputs to provide a DC output voltage. Additionally, the power converter includes a balancing circuit interconnected to the input and output stages to provide substantially balanced output currents from the plurality of interleaved LLC converters for the DC output voltage. Methods of manufacturing and operating a power converter are also provided.

A method and device for regulating charging and discharging current through a battery pack. Two or more battery packs are connected in parallel to an inverter, such that the inverter can use grid power to charge the battery packs or the battery packs can provide AC power through the inverter. A current balancing circuit device is placed in series with each battery pack and is used to regulate the current through the battery pack so that none of the battery packs is excessively charged or discharged. The current balancing circuit includes two field effect transistors (FETs) arranged in series and in opposite directions, where one FET controls charging current and the other controls discharging current. The balancing circuit also includes a current sensor, and uses proportional-integral control to provide a signal to the FETs such that the actual current flowing through the circuit is regulated to a target current value.

There is disclosed a dual magnetron sputtering apparatus that is comprised of a balancing circuit connected to the output of an ac power source that supplies ac power to at least two target materials such that the balancing circuit allows the power supply to deliver equal power to each target material. In those applications where there may be an erosion of one target material faster than the other, the balancing circuit allows the power supply to deliberately unbalance the power to at least one of the target materials to reduce power to the target to compensate for faster erosion of the target.

A semiconductor chip for amplification is connected between input-side and output-side matching circuits, and each of matching circuits includes balanced circuits which receive signals different in phase by 180 degrees, divided from an input signal. The balanced circuits are connected at a virtual grounding point, which is used as a grounding point sensitive to RF characteristics in an IPD. Thus, a semiconductor device can be free from influence of variations of grounding wires and can be reduced in size, weight, and cost.