Astec International Limited

Sudhakarababu Chakkirala

Yongtao Xie

Zhanwu Wang

Antonio Remetio Soleño

Jujo Joanis Paranal Apiag

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.

Resonant converters power supplies and control methods for reducing unbalanced currents in resonant converter power supplies

According to some aspects of the present disclosure, resonant converter power supplies and control methods for reducing unbalanced currents in resonant power supplies are disclosed. Example resonant converter power supplies include an input, an output, a transformer, and a bridge circuit coupled between the input and a primary winding of the transformer. The power supply also includes first and second rectifier rails each coupled between a secondary winding of the transformer and the output, and at least one sensor coupled to generate an error signal representing unbalanced currents in the first and second rectifier ails. The power supply further includes a controller configured to receive the error signal, and adjust a duty cycle of at least one of a first switch and a second switch of the bridge circuit based on the error signal to reduce the unbalanced currents in the first and second rectifier rails.

A multi-stage switching power supply includes a first DC-DC power converter, a second DC-DC power converter and a control circuit. The control circuit is coupled to the DC-DC power converters for providing a first control signal to the first DC-DC power converter and a second control signal to the second DC-DC power converter. The control circuit is configured to vary a duty cycle of the first control signal to regulate an output voltage of the power supply, maintain a frequency of the second control signal at a fixed frequency, and in response to the duty cycle of the first control signal reaching a duty cycle threshold or an input voltage of the first DC-DC power converter reaching a voltage threshold, vary a frequency of the second control signal to regulate the output voltage of the power supply. Other example power supplies, control circuits, etc. are also disclosed.

Methods for extending holdup times and/or reducing bulk capacitors in multi-stage switching power supplies

A control circuit for controlling a power circuit having a power switch includes a control loop configured to generate a control signal for the power switch of the power circuit based on an error signal determined by comparing a sensed parameter of the power circuit and a reference signal, and a positive offset signal and a negative offset signal each configured to adjust the control signal. The control circuit is configured to detect a change in an output current of the power circuit and selectively apply only one of the offset signals based on the change in the output current to adjust the control signal thereby enhancing a dynamic response to the change in the output current. Additional example control circuits, example power supplies and/or power converters including a control circuit for controlling a power switch, and example control methods are also disclosed.

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Pasig, Philippines

Sudhakarababu Chakkirala