Abstract:
A harmonics attenuator employing a combination controller that incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the steady state error and is separated from the pulse width modulated constant frequency signal generator that also comprises part of the classic controller. The PID portion is coupled with a state space controller such that the output of the PID controller, i.e., the steady state error correction, is input to the state space controller. The state space controller further receives as input variables a reference sinusoidal signal, the load current, the current across a pre-load filter capacitor, and the output voltage. From these inputs, the state space controller generates a transient error correction that is fed to a PWM signal generator for generating a sinusoidal output voltage signal with both steady state and transient error correction. The combination controller is thusly incorporated into an electrical feedback system referred to as a harmonics eater to attenuate higher order harmonics in an AC driven system.
Abstract:
An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit and power line. During the power output mode the power line is monitored and the output voltage, frequency and/or phase is matched or synchronized to the power line.
Abstract:
An uninterruptible power supply comprising a regulating transformer including output circuitry for connection to a load, first input circuitry for coupling a reserve AC voltage source to the regulating transformer and second input circuitry for coupling a primary AC voltage source to the regulating transformer, the second input circuitry comprising a plurality of winding taps, with each of the taps including a tap switch coupled to the primary AC voltage source.The uninterruptible power supply also includes a voltage control monitor for monitoring the voltage of the primary source and, if the voltage is outside a predetermined maximum allowable range, opening all of said tap switches to isolate the primary source from said transformer, and, if said voltage is within said predetermined maximum allowable range, selectively closing one of said tap switches so that the voltage at the load is held within a predetermined range.
Abstract:
A method for meniscus processing a substrate is provided. The method initiates with generating a meniscus spanning at least a length of the substrate. A pre-wetting liquid or vapor is dispensed. A substrate is moved through the dispensed pre-wetting liquid or vapor and the meniscus. The dispensed pre-wetting vapor condenses a pre-wetting liquid over a region of the substrate adjacent to a region of the substrate where the meniscus is generated. The pre-wetting liquid is deposited without substantially generating surface flow of the pre-wetting liquid on the substrate, and the pre-wetting liquid prevents the leading edge of the meniscus from contacting a dry surface region of the substrate.
Abstract:
A combination controller incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the steady state error and is separated from the pulse width modulated constant frequency signal generator that also comprises part of the classic controller. The PID portion is coupled with a state space controller such that the output of the PID controller, i.e., the steady state error correction, is input to the state space controller. The state space controller further receives as input variables a reference sinusoidal signal, the load current, the current across a pre-load filter capacitor, and the output voltage. From these inputs, the state space controller employs principles of differential calculus to generate a transient error correction that is fed to a PWM signal generator for generating a sinusoidal output voltage signal with both steady state and transient error correction. The sinusoidal output voltage signal is directed to a power amplifier and filtered for delivery to a connected load. The combination controller is thusly incorporated into an electrical feedback system such as a frequency converter, a power conditioner, and an uninterruptible power supply (UPS).
Abstract:
This Precise Recipe Spice Dispenser is an aid to cooks, providing accurate and speedy dispensing of proper amounts of spices in correct sequence for a given recipe. A transparent plastic form contains a series of separate trough-shaped spice compartments with open faces. The sequence and sizes of the compartments depend on the order and amounts of the individual spices required. The plastic form, when filled with the spices, is sealed to the front layer of a double-layer chipboard backing, such that the open periphery of the spice compartments exactly matches a cutout in the front layer. The back layer has a peelable strip with a peripheral perforation exactly back-to-back with the cutout periphery in the front layer. The names of the spices and the recipe as a whole may be printed on the front layer next to the sealed spice compartments. When the first spice is needed, the peelable strip is peeled back to expose just the first compartment, leaving the other compartments sealed. Subsequently, the strip is peeled to dispense the remaining spices one at a time, after which the strip becomes separated and may be discarded. If the same recipe is to be used again, the spice compartments can be refilled with spices as before and the peelable strip replaced. The Spice Dispenser is then ready to be used another time.
Abstract:
A method for meniscus processing a substrate is provided. The method initiates with generating a meniscus spanning at least a length of the substrate. A pre-wetting liquid or vapor is dispensed. A substrate is moved through the dispensed pre-wetting liquid or vapor and the meniscus. The dispensed pre-wetting vapor condenses a pre-wetting liquid over a region of the substrate adjacent to a region of the substrate where the meniscus is generated. The pre-wetting liquid is deposited without substantially generating surface flow of the pre-wetting liquid on the substrate, and the pre-wetting liquid prevents the leading edge of the meniscus from contacting a dry surface region of the substrate.
Abstract:
A combination controller incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the steady state error and is separated from the pulse width modulated constant frequency signal generator that also comprises part of the classic controller. The PID portion is coupled with a state space controller such that the output of the PID controller, i.e., the steady state error correction, is input to the state space controller. The state space controller further receives as input variables a reference sinusoidal signal, the load current, the current across a pre-load filter capacitor, and the output voltage. From these inputs, the state space controller employs principles of differential calculus to generate a transient error correction that is fed to a PWM signal generator for generating a sinusoidal output voltage signal with both steady state and transient error correction. The sinusoidal output voltage signal is directed to a power amplifier and filtered for delivery to a connected load. The combination controller is thusly incorporated into an electrical feedback system such as a frequency converter, a power conditioner, and an uninterruptible power supply (UPS).