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Tunable RF filter structure formed by a matrix of weakly coupled
RF filter structures are disclosed that may have multiple filter paths, which are provided by weakly coupled resonators. The filter paths may be interconnected...
Volume interactions for connected playback devices
Methods and systems are provided for volume interactions for connected playback devices. In one example, a playback device applies a state variable update...
Location and orientation based volume control
A computer manages methods for managing a volume of an audible transmission by, receiving an audible transmission with an associated location and orientation...
Wireless audio control apparatus
A wireless audio control apparatus comprises a U-shaped outer shell having an outer surface, an inner surface and a plurality of side surfaces. A spring clip is...
Semiconductor circuit and amplifier circuit
An amplifier circuit outputs a control signal for controlling a control target circuit and receives input of a feedback signal from the control target circuit....
Amplifier and amplification method
An amplifier comprises a biasing unit, an amplifying unit and a Schmitt trigger. The biasing unit is configured to generate a bias current which is independent...
Tube amplifier assembly having a power tube and a capacitor assembly
Tube amplifier assembly including a power tube that is configured to be coupled to a grounding deck and positioned within an opening of the grounding deck. The...
Auto-zero circuit of operational amplifier
An auto-zero circuit of an operational amplifier is disclosed, and the auto-zero circuit has: a micro-control unit and a digital potentiometer; the...
IV converter and inertial force sensor using IV converter
An IV converter includes a first operational amplifier connected to the capacitive component, a second operational amplifier connected to the first operational...
System and method for capacitive signal source amplifier
In accordance with an embodiment, a system for amplifying a signal provided by a capacitive signal source includes a first voltage follower device, a second...
Scalable periphery for digital power control
A scalable periphery digital power control arrangement is presented. The scalable periphery digital power control arrangement comprises a plurality of PMOS...
Apparatus and methods for phase compensation in power amplifiers
Apparatus and methods for phase compensation in power amplifiers are disclosed herein. In certain implementations, a power amplifier includes an input stage, an...
Capacitance to voltage converter with a leakage compensation loop
A method and apparatus for compensating current leakage is disclosed. In the method and apparatus, a differential amplifier receives a first input signal and a...
Fractional-N all digital phase locked loop incorporating look ahead time
to digital converter
A novel and useful look-ahead time to digital converter (TDC) that is applied to an all digital phase locked loop (ADPLL) as the fractional phase error...
Multiple frequency LC voltage controlled oscillator scheme
A circuit includes at least two LC voltage controlled oscillators (LCVCOs). Each LCVCO includes a switch to selectively turn on or off the LCVCO. One selected...
Solar tracker cleaning system and method
A solar tracker waterless cleaning system for cleaning solar panels of solar trackers in at least one solar tracker row, each solar tracker having a length and...
Support for solar energy collectors
A solar energy collection system can include support devices made with bearings formed from sheet material. These bearings can be optionally formed so as to...
Modular solar panel roof system
A modular solar panel roof system comprising a plurality of interconnected square-shaped modular tiles. Each modular tile comprises a circular AC solar cell on...
Assembly for locking and grounding solar panel modules to mounting
In various representative aspects, an assembly for securing array skirts and solar panel modules in an array on a roof by utilizing rotatable locking mechanisms...
Variable tilt tracker for photovoltaic arrays
A solar tracking system is disclosed. The tracking system includes a tube rotatable around its end-to-end axis. A first support is coupled to the tube at a...
Method for controlling the electromagnetic torque of a
A method for controlling electromagnetic torque of a three-phase synchronous machine with permanent magnets, including measuring current delivered to the three...
Systems and methods for controlling high speed motor
A method for controlling an electric motor includes inputting a quadrature-axis current (I.sub.q) and a direct-axis current (I.sub.d) into an electric motor,...
On-load tap changer
The invention relates to an on-load tap changer for switching among different winding taps of a step transformer without interruption. According to the...
Alternator control apparatus
An alternator control apparatus is provided which includes a first controller and a second controller that periodically transmits an instruction signal related...
A method of estimating the position of a rotor of an electric motor comprises producing an output signal indicative of motor position using a position sensor...
Motor control system
A motor control system can suppress production costs, suppress the occurrence of unexpected excessive torque, and continue system operation as much as possible...
On the dynamic response of actuation devices in nonlinear dynamics systems
A method for actuating a motor including: separating feed-forward signals corresponding to motion independent components of a required actuating force/torque...
Reliable current sensing for inverter-controlled electronic machine
Phase currents of an inverter-driven electric machine are measured by mounting phase conductors of each respective phase current into a central passage of a...
If a bus current a bus current detector 11 detects exceeds a current cutoff value, an overcurrent detector 12 supplies a gate driver 14 with an open signal for...
Motor driver having integrated braking chopper
A motor driver for driving a motor is disclosed. The motor driver has a first power bus, a first switching device coupled between the first power bus and a...
Two-dimensional locating method of motion platform based on magnetic steel
A two-dimensional locating method of a motion platform based on a magnetic steel array involves the following steps: placing more than four linear Hall sensors...
Apparatus and method for energy harvesting
An apparatus for energy conversion, comprising a piezoelectric component comprising a first part configured to convert vibrational energy into electrical...
Vibration generating apparatus
There is provided a vibration generating apparatus including: a housing having an internal space; a vibrator disposed and vibrating within the housing; and a...
Electret element and vibration power generating device using the same
In an electret element 100 including a substrate 101, an electrically-conductive electrode 103, and an electret layer 107 including a first dielectric layer 104...
Filter device, power converter and common mode noise suppression method
A filter device comprises: a filter capacitor portion having one set of ends connected to the AC voltage unit, and the other set of ends connected to DC...
System and method for leakage current suppression in a photovoltaic
cascaded multilevel inverter
The cascaded multilevel inverter is considered to be a promising topology alternative for low-cost and high-efficiency photovoltaic (PV) systems. However, the...
Method and apparatus for changing a frequency of a switch prior to a level
of current received from an inductor...
A controller including a switch, a first module, a second module, and a control module. The switch receives current from an inductor and bypasses a portion of...
AC input power converter with multi-functional inductor
In certain embodiments, a power converter has an input side connected to receive AC input power at an input node and an output side connected to produce a...
Digital frequency selective transformer-rectifier unit ripple fault
A circuit for converting variable frequency generated AC electric power to DC electric power for use on loads comprises a transformer-rectifier unit to convert...
In a DC/DC converter for bidirectional power transmission, a first switching circuit is connected between a first winding of a high-frequency transformer and a...
Switching power-supply device
A switching power-supply device includes: a transformer including a primary coil and a secondary coil; a rectifying-and-smoothing circuit; a series circuit...
Switched-mode power supply device
A switched-mode power supply device is disclosed including an AC power supply, a transformer including a primary winding and a secondary winding, a switching...
Method for operating a resonant converter, and resonant converter
A method for operating a resonant converter having an inverter circuit, the inverter circuit having a plurality of switches, includes: switching each of the...
Method for extending power supply hold-up time by controlling a
transformer turn ratio
In one embodiment a method of extending power supply hold-up time by controlling a transformer turn ratio may include an input capacitor receiving an input...
Control method and device employing primary side regulation in a
quasi-resonant AC/DC flyback converter
The present disclosure is directed to a primary-controlled high power factor quasi resonant converter. The converter converts an AC power line input to a DC...
Snubber circuit and buffering method for snubber circuit
A snubber circuit includes a capacitor and a buffer device. The buffer device has a first terminal and a second terminal. The first terminal is electrically...
DC-DC power conversion apparatus
A power conversion apparatus, which converts power of a DC power supply and provides it to the loading, includes a transformer, an electronic switch, a leakage...
Method and apparatus for controlling a frequency converter
An apparatus and method of controlling a frequency converter is provided. First, subsynchronous components in the electrical grid are identified using voltage...
A voltage converter including a constant turned-on time signal generator, a first transistor, a second transistor, an inductor, a ripple signal compensator, and...
Current estimation for a converter
A embodiment relates to a current estimation circuitry for a converter comprising: an integrator for integrating a voltage across an inductor of the converter;...