초록 ▼

An apparatus for electronically communicating metered electrical power is disclosed. A first processor receives voltage and current signals and determines electrical power. The first processor generates an power signal representative of the electrical power determination. A second processor, connect

An apparatus for electronically communicating metered electrical power is disclosed. A first processor receives voltage and current signals and determines electrical power. The first processor generates an power signal representative of the electrical power determination. A second processor, connected to said first processor, receives the power signal and generates an output signal representative of electrical power information. A output device is connected to receive the output signal to output the electrical power information. The first processor determines units of electrical power from the voltage and current signals and to generates an power signal representative of the determination of such units and the rate at which the units are determined. The output devices may be one of a display, optical port and an option connector. When the output device is a display, the second processor may generate a disk signal representative of a rate of disk rotation in relation to the rate at which the units are determined, wherein the output signal to the display is representative of the units, the rate at which said units are determined, and the rate of disk rotation. The first processor, while concurrently determining units of electrical power, further may determine watt units, apparent reactive power units and the rate at which such units are determined, wherein the watt units, the apparent reactive power units and the rate at which such units are determined are displayed. The first processor may also meter multiple types of electrical power and generates power signals. The second processor, when connected to the optical port, generates an output signal in response to the power signals, wherein the generation of the output signal includes the multiplexing of the power signals into the output signal.

대표청구항 ▼

An apparatus for electronically communicating metered electrical power is disclosed. A first processor receives voltage and current signals and determines electrical power. The first processor generates an power signal representative of the electrical power determination. A second processor, connect

An apparatus for electronically communicating metered electrical power is disclosed. A first processor receives voltage and current signals and determines electrical power. The first processor generates an power signal representative of the electrical power determination. A second processor, connected to said first processor, receives the power signal and generates an output signal representative of electrical power information. A output device is connected to receive the output signal to output the electrical power information. The first processor determines units of electrical power from the voltage and current signals and to generates an power signal representative of the determination of such units and the rate at which the units are determined. The output devices may be one of a display, optical port and an option connector. When the output device is a display, the second processor may generate a disk signal representative of a rate of disk rotation in relation to the rate at which the units are determined, wherein the output signal to the display is representative of the units, the rate at which said units are determined, and the rate of disk rotation. The first processor, while concurrently determining units of electrical power, further may determine watt units, apparent reactive power units and the rate at which such units are determined, wherein the watt units, the apparent reactive power units and the rate at which such units are determined are displayed. The first processor may also meter multiple types of electrical power and generates power signals. The second processor, when connected to the optical port, generates an output signal in response to the power signals, wherein the generation of the output signal includes the multiplexing of the power signals into the output signal. he feedback filter includes attenuation poles substantially corresponding to ripple frequencies associated with the PWM power stage. 13. The power converter of claim 1 wherein the amplifier circuit is an opposed current amplifier. 14. A method of regulating a power converter output signal including the steps of: receiving a high-pass feedback signal from the power converter; receiving a low-pass feedback signal from the power converter; combining the high-pass feedback signal and the low-pass feedback signal using a constant-sum filter of at least second order; and providing a control feedback signal to the power converter to regulate the output signal. 15. The method of claim 14 wherein the constant-sum filter is a three-terminal low-pass filter including a common terminal coupled to the high-pass feedback signal, an input terminal coupled to the low-pass feedback signal, and an output terminal for outputting the feedback control signal. 16. The method of claim 14 further including the step of passing the sum of the feedback control signal and a source signal through a PWM power stage and an output filter having an input connected to the PWM power stage and an output for providing the output signal. 17. The method of claim 16 further including the step of receiving the low-pass feedback signal from the output filter output. 18. The method of claim 16 further including the step of filtering a signal at the output filter input to provide the high-pass feedback signal. 19. An amplifier system including; an amplifier having a high-pass feedback signal output and a low-pass feedback signal output; and a remote sensing circuit including a constant-sum filter of at least second order for combining the high-pass and low-pass feedback signals to provide a feedback control signal to the amplifier. 20. The system of claim 19 wherein the constant-sum filter is a three-terminal low-pass filter. 21. The system of claim 20 wherein the low-pass filter includes a common terminal coupled to the high-pass feedback signal output, an input terminal coupled to the low-pass feedback signal output, and an output terminal for outputting the feedback control signal. 22. The system of claim 19 wherein the constant-sum filter is a unity gain active filter. 23. The system of claim 19 wherein the constant-sum filter is one of a Sallen and Key filter, a multiple-feedback filter, and a state-variable filter. 24. The system of claim 19 wherein the amplifier includes a PWM power stage, and an output filter having an input connected to the PWM power stage and an output coupled to a load, the low-pass feedback signal being sensed at the output filter output. 25. The system of claim 24 wherein the amplifier includes a feedback filter coupled to the output filter input, the feedback filter outputting the high-pass feedback signal. 26. The system of claim 19 wherein the amplifier is an opposed current amplifier. itry for driving a motor by PWM (Pulse Width Modulation) control, comprising: switching means respectively associated with drive coils, which are included in the motor and assigned to a particular phase each; frequency oscillating means for generating a triangular wave; first comparing means for generating a pulse sequence by comparing the triangular wave and a voltage for PWM oscillation frequency modulation: position sensing means for sensing angular positions of the motor; pulse generating means for counting a preselected number of pulses, which are included in the pulse sequence, by using each of positive-going edges and negative-going edges of position signals output from said position sensing means as a trigger to thereby generate pulse signals; voltage adjusting means for converting a voltage for duty modulation to a plurality of voltage levels; voltage selecting means for selecting one of the plurality of voltage levels in accordance with the pulse signals output from said pulse generating means, and outputting a voltage level selected as a duty modulation voltage; second comparing means for outputting a first duty signal by comparing the voltage for duty modulation and the triangular wave; third comparing means for outputting a second duty signal by comparing the duty modulation voltage output from said voltage adjusting means and the triangular wave; and exciting pulse generating means for generating, based on the position signals output from said position sensing means and the first and second duty signals, a gate signal for switching control for a preselected period of time at each time of phase switching, wherein said gate signal includes a signal for reducing noise of the motor. 2. The circuitry as claimed in claim 1, wherein said voltage adjusting means divides the voltage for duty modulation with a plurality of resistors to thereby output the voltage levels, and said voltage selecting means selects one of the voltage levels in accordance with the pulse signals. 3. The circuitry as claimed in claim 2, wherein said frequency oscillating means generates the triangular wave on the basis of charging and discharging of a capacitor. 4. The circuitry as claimed in claim 3, wherein the capacitor has a variable capacitance. 5. The circuitry as claimed in claim 4, wherein the capacitor is replaceable. 6. The circuitry as claimed in claim 5, wherein the preselected number of pulses to be counted by said pulse generating means is variable. 7. The circuitry as claimed in claim 6, wherein the capacitor is replaced or the preselected number of pulses is varied when the motor is replaced. 8. The circuitry as claimed in claim 7, wherein said switching means comprises a plurality of MOSFETs (Metal Oxide Semiconductor Field Effect Transistors). 9. The circuitry as claimed in claim 8, wherein said switching means comprises bipolar transistors. 10. The circuitry as claimed in claim 9, wherein said exciting pulse generating means generates the gate signal when said switching means should be turned off. 11. The circuitry as claimed in claim 10, wherein said exciting pulse generating means generates the gate signal when said switching means should be turned on. 12. The circuitry as claimed in claim 11, wherein said exciting pulse generating means generates the gate signal when said switching means should be turned off and when said switching means should be turned on. 13. The circuitry as claimed in claim 12, wherein the plurality of voltage levels to be selected by said voltage selecting means and the pulse signals to be output from said pulse generating means correspond one-to-one to each other. 14. The circuitry as claimed in claim 13, wherein the plurality of voltage levels to be selected by said voltage selecting means and the pulse signals to be output from said pulse generating means have a 1:n correspondence to each other. 15. The circuitry as claimed in claim 1, wherein said frequency oscillating means generates