Patent ID: 7542309

Claim:
A voltage stabilizer circuit of forward converter comprising: a transformer, said transformer having a primary side and a secondary side, said secondary side comprising first winding means and one second winding means, said first winding means being adapted to output a first DC voltage, said second winding means being adapted to output a second DC voltage; a first switch being a three terminals element, said first switch having a first end coupled to one end of said first winding means, a second end, and a third end having connected in series thereto an inductor and a capacitor, the capacitor at the third end of said first switch having a load connected to two opposite ends thereof; a rectifier, said rectifier having a first end coupled to the third end of said first switch and a second end coupled to an opposite end of said first winding means and then grounded; an error amplifier, said error amplifier having a first end coupled to said load to detect voltage variation of said load and to output a corresponding control signal; a control circuit, said control circuit having an input end coupled to said error amplifier and adapted to output a regulation signal subject to the control signal of said error amplifier; a driving circuit, said driving circuit having a first end coupled to said control circuit and a second end coupled to the second end of said first switch for controlling turn-on time of said first switch subject to the regulation signal from said control circuit to maintain the output of the load voltage at a predetermined level; a first resistor, said first resistor having a first end coupled to a third DC voltage and a second end; a second resistor, said second resistor having a first end coupled to the second end of said first resistor, and a second end; a first capacitor, said first capacitor having a first end coupled to the second end of said second resistor, and a second end; a third resistor, said third resistor having a first end coupled to the second end of said first resistor, and a second end grounded; a fourth resistor, said fourth resistor having a first end coupled to the second end of said first capacitor, and a second end coupled to said control circuit; a fifth resistor, said fifth resistor having a first end coupled to said control circuit, and a second end coupled to the second end of said first capacitor and the second end of said fourth resistor; and a gate-controlled diode, said gate-controlled diode having a gate coupled to the first end of said third resistor, an anode grounded, and a cathode coupled to the second end of said first capacitor, wherein when said load is changed to lower the output voltage of said load, the output voltage of said gate-controlled diode is increased, allowing a relatively greater amount of electric current to pass to said control circuit.