Telefonaktiebolaget Lm Ericsson (publ)

Marko Leskovec

Magnus Karlsson

Oscar Persson

Jonas Malmberg

Mikael Appelberg

Fredrik Wahledow

A controller for a switched mode power supply (SMPS) including a reference voltage signal generator to generate a variable reference voltage signal for regulating an output voltage of the SMPS, and a voltage droop control signal generator to receive a current indicator signal indicative of an output current of the SMPS, and generate an output voltage droop control signal in response to a first function and a second function of the current indicator signal. The first function is employed when the reference voltage signal generator ramps the variable reference voltage signal, and the second function is employed thereafter. The controller includes a switching control signal generator to receive a voltage indicator signal, and to generate a control signal to regulate the output voltage of the SMPS based on the voltage indicator signal, the variable reference voltage signal, and the output voltage droop control signal.

Voltage droop control in a voltage-regulated switched mode power supply

A switched mode power supply (SMPS) is disclosed in which a simple primary side controller is used to send a single pulse of energy to the secondary side to switch on an output voltage controller. The pulse is sent across the main power train and a filtering arrangement is provided on the secondary side to minimize the energy at the output of the SMPS while maximizing the energy supplied to the output voltage controller. Advantageously, the SMPS is configured such that the maximum amount of energy transferred from the primary side to the secondary side during a start-up operation is inherently limited. Protection against short circuit conditions and malfunctions is therefore provided without requiring complicated circuitry.

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Nybro, Sweden

Marko Leskovec