| 摘要 |
A switched mode power supply comprises a switched mode converter (12) and a controller for controlling the switched mode converter, wherein the switched mode converter is provided for converting an input voltage (Vin) to an output voltage (Vout) and includes, on a primary side, a primary winding (X1) and a controllable switch based circuitry (31) connecting the input voltage over the primary winding; and, on a secondary side, a secondary winding (X2) coupled to the primary winding, and a capacitive element (C) connected over the secondary winding, wherein the output voltage is obtained as the voltage over the capacitive element. The primary winding comprises a first winding portion (np1) and at least one further winding portion (np2); and the switch based circuitry comprises controllable switches (Q11, Q41, Q12, Q42, Q21, Q31) capable of switching between a first operation state wherein the input voltage is connected only over the first winding portion and at least a second operation state wherein the input voltage is connected over the first and the at least one further winding portions, thereby enabling switching between two different transformer ratios (n1, n2). |
| 主权项 |
1. A switched mode power supply, comprising:
a switched mode converter configured to convert an input voltage to an output voltage; a controller for controlling the switched mode converter; wherein the switched mode converter comprises:
on a primary side, a primary winding and a controllable switch based circuitry connecting the input voltage over the primary winding;on a secondary side, a secondary winding coupled to the primary winding; anda capacitive element connected over the secondary winding; wherein the output voltage is obtained as the voltage over the capacitive element; wherein the primary winding comprises a first winding portion and at least one further winding portion; wherein the switch based circuitry comprises controllable switches capable of switching between a first operation state wherein the input voltage is connected only over the first winding portion and at least a second operation state wherein the input voltage is connected over the first and the at least one further winding portions, thereby enabling switching between two different transformer ratios; and wherein the controller is operatively connected to the controllable switches and configured to:
monitor the input voltage; andcontrol the controllable switches to switch between the first and the at least second operation states based on the monitored input voltage, with different threshold voltages used to switch the switches from the first operation state to the second operation state and to switch back. |
