FIELD: electricity.
SUBSTANCE: step-down voltage converter (100) to generate a positive constant (DC) output voltage (VOUT) from a positive constant (DC) input voltage (VIN) comprises an n-channel field transistor (FT) (Q1) switch (111) which contains a drain terminal (112) and a source terminal (114). The source terminal (114) of the switch (111) is electrically connected to the output voltage (VOUT), a diode (117) containing an anode (118) and a cathode (120). The cathode (120) of the diode is electrically connected to the output voltage (VOUT), the first inductor (124) electrically connecting the drain terminal (112) of the switch (111) to the input voltage (VIN). The first inductor (124) comprises the first winding of a two-winding transformer, the second inductor (126) which is magnetically coupled with the first inductor (124). The second inductor (126) electrically connects the anode (118) of the diode (117) with the reference voltage (128). The second inductor (126) comprises the second winding of a two-winding transformer. Only the first inductor (124) and the second inductor (126) are wound on a ferrite core (222), and a switching controller (110) connected to the output voltage (VOUT) and configured to control the switch (111) by gate (216) terminal of the field transistor (FT) (Q1). The switching controller (110) is configured to control the switch (111) by turning the switch (111) on and off, preferably periodically, so that the current does not flow from the output of the switching controller (110) to the output voltage.
EFFECT: simplifying the switching controller by limiting the voltage swing at the gate of the n-channel field transistor switch.
11 cl, 6 dwg
