A regulator circuit is disclosed incorporating a DC capacitor as an energy storage device to be charged to a direct voltage level from an AC source through switch means. The switch means may be semi-conductor switches and because of the direct voltage on the energy storage device, a substantially square wave alternating voltage appears on the switch input. An inductive reactance absorbs the instantaneous voltage differences between the square wave and the alternating voltage input. The switches are operated at the same frequency as the alternating voltage input and operate at a variable phase angle of lag of the leading edge relative to the alternating voltage input in order to regulate the voltage output which may either DC across the storage device or AC across the switch input. The switch means is a double throw switch conducting for substantially 180.degree. alternately to obtain the direct voltage across the storage device. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
An uninterruptible power supply derives regulated power from either a primary power source or a reserve power source. A power flow control unit derives the output power as needed from either one or both power sources. Its operating characteristics are selected so that complicated transfer and disconnect circuitry is eliminated.
Many current electronic systems incorporate expensive or sensitive electrical components. Because electrical energy is often generated or transmitted at high voltages, the power supplies to these electronic systems must be carefully designed. Power supply design must ensure that the electrical system being supplied with power is not exposed to excessive voltages or currents. In order to isolate power supplies from electrical equipment, many methods have been employed. These methods typically involve control systems or signal transfer methods. However, these methods are not always suitable because of their drawbacks. The present invention relates to transmitting information across an interface. More specifically, the present invention provides an apparatus for transmitting both AC and DC information across a high bandwidth magnetic interface with low distortion.
A circuit for regulating an electrical parameter to be servo-controlled by transferring electricity between two networks (11, 12), wherein the circuit (10) is a bidirectional current circuit providing electrical isolation between the two networks (11, 12). The circuit is particularly applicable to space applications.
A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.
A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.
