A converter module is provided with a first power delivery circuit, a second power delivery circuit, and a controller. The first power delivery circuit supplies current from a first direct current (DC) source to a resonant stage in a first direction. The first power delivery circuit comprises at least two first switches. The second power delivery circuit supplies the current from the first DC source to the resonant stage in a second direction, opposite the first direction. The controller includes memory, and a processor that is programmed to: enable the first power delivery circuit and the second power delivery circuit alternately to provide power as a periodic waveform to the resonant stage; and disable the at least two first switches individually in a sequence to generate a phase shift in the periodic waveform and to disable the first power delivery circuit.

A power supply comprises a transformer having a primary winding and a secondary winding, a bridge circuit coupled to the primary winding of the transformer, a first rail coupled to the secondary winding of the transformer, and a second rail coupled to the secondary winding of the transformer. The bridge circuit comprises a plurality of switches. The power supply also comprises a first sensor assembly coupled to generate a first error signal representing a difference between currents in the first rail and the second rail. A controller is configured to alter a duty cycle of a first switch of the plurality of switches relative to a duty cycle of a second switch of the plurality of switches based on the first error signal.

An AC/DC converter stage for a converter system with an input series structure. The AC/DC converter stage includes two input terminals for inputting an AC input voltage and at least a first circuit branch with at least two switches that are electrically connected in series at a first connection point, where a first input terminal of the two input terminals is electrically connected to the first connection point of the first circuit branch. At least one first electrical storage provides a DC output voltage and is electrically connected in parallel to the first circuit branch. At least one controllable bidirectional switch is electrically connected between the two input terminals.

Control of a resonant power converter using switch paths during power-up is described herein. During power-up, a first switch path sinks current away from a resonant capacitor while a second switch path sources current to a high-side capacitor. In this way the high-side capacitor may predictably charge to sufficient bootstrap voltage for steady state operation. Additionally, a third switch path may control current to a low-side capacitor.

System and method for controlling synchronous rectification. For example, a system for controlling synchronous rectification includes: a first controller terminal configured to receive a first input voltage a second controller terminal biased to a second input voltage; a third controller terminal configured to output an output voltage; a first signal generator configured to generate a logic signal based on at least information associated with the first input voltage a second signal generator configured to receive the logic signal and generate an adjustment signal based on at least information associated with the logic signal and the first input voltage; and a driver configured to receive the logic signal and the adjustment signal and generate the output voltage based at least in part on the logic signal and the adjustment signal.

An integrated circuit for a power supply circuit including a transformer having a primary coil, a secondary coil, and an auxiliary coil, and a transistor configured to control a current flowing through the primary coil. The integrated circuit includes a first terminal receiving a power supply voltage corresponding to a voltage from the auxiliary coil; a second terminal receiving a feedback voltage corresponding to an output voltage; a third terminal receiving a voltage corresponding to a current flowing through the transistor when the transistor is on; a determination circuit determining whether a detection circuit configured to detect a voltage generated in the auxiliary coil is coupled between the third terminal and the auxiliary coil; and a switching control circuit controlling switching of the transistor based on the voltages at the second and third terminals and a determination result of the first determination circuit.

The present document relates to a power converter configured to convert an input voltage at an input of the power converter into an output voltage at an output of the power converter. The power converter may comprise a power stage, a voltage controlled voltage source VCVS, a first feedback path and a second feedback path. The power stage may be coupled to the output of the power converter. The VCVS may be configured to generate, at an output of the VCVS, an error voltage by comparing a reference voltage with a feedback voltage indicative of the output voltage. The first feedback path may extend from the output of the power converter, via the VCVS, via the power stage, to the output of the power converter. The second feedback path may extend from the output of the VCVS to the output of the power converter.

In an embodiment, a method for operating an ACF converter includes: turning on a low-side transistor that is coupled between a primary winding of a transformer and a reference terminal to cause a forward current to enter the primary winding, turning off the low-side transistor; after turning off the low-side transistor, turning on a high-side transistor that is coupled between the primary winding and a clamp capacitor to cause a reverse current to flow through the primary winding; and after turning on the high-side transistor, when an overcurrent of the reverse current is not detected, keeping the high-side transistor on for a first period of time, and turning off the high-side transistor after the first period of time, and when the overcurrent of the reverse current is detected, turning off the high-side transistor without keeping the high-side transistor on for the first period of time.

In an embodiment, a method for operating an ACF converter includes: turning on a low-side transistor that is coupled between a primary winding of a transformer and a reference terminal to cause a forward current to enter the primary winding, turning off the low-side transistor; after turning off the low-side transistor, turning on a high-side transistor that is coupled between the primary winding and a clamp capacitor to cause a reverse current to flow through the primary winding; and after turning on the high-side transistor, when an overcurrent of the reverse current is not detected, keeping the high-side transistor on for a first period of time, and turning off the high-side transistor after the first period of time, and when the overcurrent of the reverse current is detected, turning off the high-side transistor without keeping the high-side transistor on for the first period of time.

An energy harvesting circuit for harvesting energy from a medium voltage power line. The energy harvesting circuit includes an input capacitor electrically coupled to the power line and storing power therefrom, and a flyback converter including a primary coil and a secondary coil. The harvesting circuit further includes a switching circuit electrically coupled in series with the primary coil and being operable to electrically connect and disconnect the input capacitor to and from the primary coil, where the switching circuit includes an input voltage regulation feedback circuit for regulating an input voltage provided to the switching circuit from the input capacitor. The harvesting circuit also includes an output capacitor electrically coupled to the secondary coil and the actuator, where the output capacitor is charged by the secondary coil when the switching circuit is closed to provide power to an actuator to close a vacuum interrupter.