POWER SUPPLY SYSTEM AND VOLTAGE STABILIZING METHOD

摘要

Provided are a power supply system and a voltage stabilizing method for supplying power stably to a load, reducing a circuit area and suppressing an increase in cost. A voltage stabilizing circuit (40) is arranged between an insulating converter (10) and a non-insulating converter (20). The voltage stabilizing circuit (40) is allowed to produce, to the capacitance (C) of a capacitor (41), substantially the same effect as that in the case where a capacitor having hfe times larger capacitance when the current amplification rate of the transistor (45) is hfe is inserted between a power supply line (31) and a ground(32) by applying a base current (Ib) to the transistor (45) via the capacitor (41) and thereby applying a collector current (Ic) which is hfe times as large as the base current (Ib) to a collector of the transistor (45) when an input voltage (Vin) from the insulating converter (10) rises.