Abstract: A method, apparatus and computer program product are provided for implementing power system performance. Power supply system data are processed and a power path in a power supply system having a predefined component failure mode is identified for placement of a fuse. Transient and steady state current levels are determined for each identified power path. A fuse size is selected within an identified fuse size range based upon the determined transient and steady state current levels. A selected fuse energy rating is lower than an energy rating of the solid-state devices in the identified power path.

Abstract: A power converter controller and a method for controlling a power converter are provided. The power converter includes first and second power transformers, each having first and second primary windings and a secondary winding; and first and second switches that alternately couple primary windings of the first and second power transformers to an input power source. The power converter controller receives a feedback signal, such as a DC power output voltage from the power converter. A voltage controlled oscillator responsive to the feedback signal provides a variable frequency signal. A phase shift controller coupled to the voltage controlled oscillator provides a variable phase shifted signal responsive to the variable frequency signal. Gate drive signals are decoded using the variable frequency signal and variable phase shifted signal for driving first and second switches of the power converter.

Abstract: A power converter controller and a method for controlling a power converter are provided. The power converter includes first and second power transformers, each having first and second primary windings and a secondary winding; and first and second switches that alternately couple primary windings of the first and second power transformers to an input power source. The power converter controller receives a feedback signal, such as a DC power output voltage from the power converter. A voltage controlled oscillator responsive to the feedback signal provides a variable frequency signal. A phase shift controller coupled to the voltage controlled oscillator provides a variable phase shifted signal responsive to the variable frequency signal. Gate drive signals are decoded using the variable frequency signal and variable phase shifted signal for driving first and second switches of the power converter.

Abstract: An AC transfer switch (ATS) is provided for switching a system load between at least two AC lines. A first bridge rectifier is connected to a first AC line for providing a first full wave rectified AC waveform. A first pair of oppositely poled silicon controlled rectifiers (SCRs) is coupled to the first bridge rectifier and to the system load. A second bridge rectifier is connected to a second AC line for providing a second full wave rectified AC waveform. A second pair of oppositely poled silicon controlled rectifiers (SCRs) coupled to the second bridge rectifier and to the system load. Control logic is coupled to a gate input of the first pair of oppositely poled silicon controlled rectifiers (SCRs) and a gate input of the second pair of oppositely poled silicon controlled rectifiers (SCRs) for applying one of the first full wave rectified AC waveform or the second full wave rectified AC waveform to the system load.

Abstract: An AC transfer switch (ATS) is provided for switching a system load between at least two AC lines. A first bridge rectifier is connected to a first AC line for providing a first full wave rectified AC waveform. A first pair of oppositely poled silicon controlled rectifiers (SCRs) is coupled to the first bridge rectifier and to the system load. A second bridge rectifier is connected to a second AC line for providing a second full wave rectified AC waveform. A second pair of oppositely poled silicon controlled rectifiers (SCRs) coupled to the second bridge rectifier and to the system load. Control logic is coupled to a gate input of the first pair of oppositely poled silicon controlled rectifiers (SCRs) and a gate input of the second pair of oppositely poled silicon controlled rectifiers (SCRs) for applying one of the first full wave rectified AC waveform or the second full wave rectified AC waveform to the system load.

Abstract: A full-bridge DC-to-DC converter having an unipolar gate drive is disclosed. The full-bridge DC-to-DC converter includes a primary-to-secondary transformer, multiple gate drive circuits, and multiple gate drive transformers. The primary-to-secondary transformer converts a first DC voltage to a second DC voltage under the control of the gate drive circuits. Each of the gate drive circuits includes a first transistor and a second transistor. The gate of the first transistor is connected to a pulse voltage source via a diode. The drain of the second transistor is connected to the source of the first transistor, and the source of the second transistor is connected to the gate of the first transistor via a resistor, for discharging a gate-to-source voltage of the first transistor during the time when a voltage of the pulse voltage source is below a gate-to-source threshold voltage of the first transistor.

Abstract: An electronic load circuit provides a variable load current at a high amp level, at low-voltage so that contemporary voltage supplies of perhaps 1.5V may be tested. This load is used for testing voltage supply circuits for computer systems or the like. A number of parallel, high-current MOS transistors of low internal resistance are used as a constant-current load. Current in the load path is sensed by a sensing resistor connected in series with all of the transistors, and this resistor has a value of the order of the effective internal resistance of the source-to-drain paths of the parallel transistors and connecting links to these transistors via a circuit board, connector terminals, etc. The sensing resistor provides a feedback signal to a high-gain op-amp, the output of which is compared to a variable input signal to produce a gate drive voltage for the transistors. The input signal may be varied to simulate the variable loading exhibited by a computer system.