Start-up controller for a power converter

Abstract

The invention discloses a start-up controller for a power converter. Power converters, e.g., AC / DC and DC / DC, typically have unique circuitry for a proper graceful start-up and aim develop correct operating voltage biases. Typically this unique circuitry is incorporated in a primary-side controller. This primary-side controller could also be the primary means of control of the power converter once started. However, a secondary-side controller is typically needed for more exact output voltage regulation, duplicating circuitry already present in the primary-side controller. Complication is typically added by linear communication between the two controllers across an isolation barrier. A simplified primary-side start-up controller is envisioned providing minimal circuitry to power up a converter until a secondary-side controller activates and takes control by sending discrete PWM commands across the isolation barrier instead of a linear signal. The start-up controller can provide voltage and current protection if the secondary-side controller fails. The secondary-side controller can be an analog and / or digital design for sophisticated converter control.

Description

[0001] Related Patent Applications [0002] This application claims priority over commonly owned U.S. Provisional Patent Application No. 62 / 082,317, filed November 20, 2014, entitled "Start-Up AC / DC Converter," by Thomas Quigley rights, said case is incorporated herein by reference for all purposes. technical field [0003] The present invention relates to power converters, and in particular, to start-up controller methods and apparatus for DC / DC and AC / DC power converters. Background technique [0004] Power converters such as DC / DC and AC / DC typically have unique circuitry for a properly smooth start (soft start) and for correct operating voltage biasing. This unique circuitry may require custom integrated circuits and / or proprietary designs, which can increase the cost and delivery schedule of such power converters. FIG. 3 illustrates a schematic diagram of a prior art flyback converter. Transformer T1 is shown with a primary side bias winding 302 . This is used to b...

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