摘要:
A method for constructing a direct-current to direct current (DC-DC) converter from an input voltage to an output voltage. The DC-DC converter has multiple capacitors and multiple switches connectible the capacitors. A target voltage ratio is obtained based on the input voltage and the output voltage. The target voltage is expressed as a radix number. The radix number is spawned into a code of the target voltage ratio. The code is translated into a switched-capacitor converter (SCC) configuration including the switches and the capacitors. The code may be an extended binary representation code or a Generic Fractional Numbers code. The switched-capacitor converter (SCC) configuration is preferably modified to obtain charge balance.
摘要:
A system and method for supplying power to a load and for controlling the power factor presented to the power line. Output voltage is controlled by a digital, outer, control loop, and inner, analog, control loop causes the input current to be substantially proportional to the input voltage at any particular point in the power line cycle. Thus, the system presents a load to the power line that appears to be purely resistive. The use of an analog multiplier is not required, nor is sampling of input voltage. Limiting of inrush current provides for brown-out protection and soft-start.
摘要:
A micromotor comprising: a piezoelectric element including a common electrode and a plurality of other electrodes formed thereon and including at least a first a and a second electrode group, each group including at least one electrode, wherein the piezoelectric element causes motion in a first direction when a voltage is applied between the first electrode group and the common electrode, and wherein the piezoelectric element causes motion in a second direction when a voltage is applied between the second electrode group and the common electrode; a voltage source that electrifies the common electrode; and at least two switches separately connected between the first and second electrode groups and a low voltage, said switches being activatable to connect one of said first and second electrode groups to the low voltage to cause selective motion in the first or second directions.
摘要:
Modular apparatus for regulating the harmonics of current drawn from power lines by electric equipment, comprising a first rectifier circuit module, consisting of an array of rectifying diodes; a second Switch and Controller Assembly (SCA) module, which comprises a power switch and controller and their interconnections; an input inductor for filtering the current drawn from the rectifier module; and an output capacitor, for filtering the output voltage ripple at the load. The inlet of the rectifier is connected to the power line and an outlet of the rectifier module is connected to the SCA. The inlet of said SCA is connected to the rectifier, via an inductor and the outlet of said SCA is connected to the output capacitor. The inlet of the inductor is connected to the rectifier, the outlet of the inductor is connected to the inlet of said SCA, and the capacitor is connected in parallel with the load.
摘要:
An electronic circuit which provides an electrical incapacitation current to a living target. The circuit includes a high voltage power supply, a charge-storing capacitor connected by a high voltage lead to the high voltage power supply. The charge-storing capacitor stores a charge at high voltage as supplied by the high voltage power supply. The circuit further includes a switch, a step-up transformer including a primary coil a secondary coil, a resonant circuit and an output terminal serially connected through the secondary coil to the high voltage lead of the charge-storing capacitor. The primary coil is connected in parallel with the charge-storing capacitor through the switch. During the incapacitation, the output terminal is operatively attached to at least a part of the living target. When the switch is closed, the resonant circuit initially stores zero charge, and any gap if present between the output terminal and the living target undergoes electrical breakdown from energy stored in the charge-storing capacitor. After the electrical breakdown, the incapacitation current is provided substantially from the charge stored in the charge-storing capacitor.
摘要:
A method for reducing the harmonics contents of an input current drawn from a power line into an electrical system without sensing an input voltage, the method comprising providing an active power factor correction controller with a switch module having a main switch and a timing device, wherein the main switch has an on-time correlated with an on-duty cycle duration, and an off-time correlated with an off-duty cycle duration, and maintaining a linear relationship between the off-duty cycle duration and the input current by using the timing device; and an apparatus for active power factor correction with minimum input current distortion, comprising an active power factor correction assembly that includes a main switch and a timing device, wherein the main switch has associated therewith an on-time correlated with an on-duty cycle duration, and an off-time correlated with an off-duty cycle duration, and wherein the timing device generates the mentioned on-time and off-time, and linearization means for maintaining a linear relation between the off-duty cycle duration and the input current.
摘要:
An electronic circuit which provides an electrical incapacitation current to a living target. The circuit includes a high voltage power supply, a charge-storing capacitor connected by a high voltage lead to the high voltage power supply. The charge-storing capacitor stores a charge at high voltage as supplied by the high voltage power supply. The circuit further includes a switch, a step-up transformer including a primary coil a secondary coil, a resonant circuit and an output terminal serially connected through the secondary coil to the high voltage lead of the charge-storing capacitor. The primary coil is connected in parallel with the charge-storing capacitor through the switch. During the incapacitation, the output terminal is operatively attached to at least a part of the living target. When the switch is closed, the resonant circuit initially stores zero charge, and any gap if present between the output terminal and the living target undergoes electrical breakdown from energy stored in the charge-storing capacitor. After the electrical breakdown, the incapacitation current is provided substantially from the charge stored in the charge-storing capacitor.
摘要:
Apparatus of a grid-connected switching inverter for injecting it current into a power line comprises: (a) an electrical energy source for providing the substantially DC voltage to the apparatus; (b) a switching inverter connected to the electrical energy source for converting the substantially DC voltage of the electrical energy source to a high frequency alternating voltage; (c) a waveform generator for controlling the magnitude and shape of the alternating high frequency voltage outputted from the switching inverter by means of a control signal fed into the switching inverter; (d) an inductor connected to an output of the switching inverter for generating an alternating current from the alternating high frequency voltage, wherein the magnitude of the alternating current depends on a frequency of the alternating high frequency voltage: (e) a rectifier connected in series with the inductor for rectifying the alternating current and for outputting a rectified unipolar alternating current, wherein the rectified average value of the alternating current is proportional to the absolute magnitude of the power line voltage; and (t) a polarity commutator connected to an output of the rectifier for converting the rectified unipolar alternating current into a bipolar alternating current, and for injecting the bipolar alternating current into a power line, wherein the bipolar alternating current is substantially in phase with and of shape of the power line voltage of the power line.
摘要:
A method for constructing a direct-current to direct current (DC-DC) converter from an input voltage to an output voltage. The DC-DC converter has multiple capacitors and multiple switches connectible the capacitors. A target voltage ratio is obtained based on the input voltage and the output voltage. The target voltage is expressed as a radix number. The radix number is spawned into a code of the target voltage ratio. The code is translated into a switched-capacitor converter (SCC) configuration including the switches and the capacitors. The code may be an extended binary representation code or a Generic Fractional Numbers code. The switched-capacitor converter (SCC) configuration is preferably modified to obtain charge balance.
摘要:
Apparatus driven by high-frequency AC current source, for driving an electric load with low-frequency AC current, that comprises a current splitting inductor, for generating, from the high-frequency current source, a first and a second high-frequency AC current sources; a rectifier, coupled to the splitting inductor, consisting of rectifying diodes for rectifying the first and second high-frequency current sources, and capacitors, charged by the diodes, the capacitors being corresponding to the first and second DC current sources; a controllable half-bridge commutator having a first and a second control inputs, the commutator being coupled to the DC current sources, for commutating the DC current sources, for allowing to generate, from the DC current sources, the low-frequency AC current required for driving the electric load; and a control circuitry, having a first and a second outputs, the outputs being coupled to the first and second control inputs, respectively, and outputting two complimentary pulse trains, each of which having a frequency being automatically adjusted according to the operating conditions of the electric load, for controlling the switching time of the commutator, thereby causing the commutator to alternately change the direction of the current passing through the electric load.