Voltage regulator circuit
First Claim
1. A voltage regulator circuit for generating a regulated output DC voltage from a non-regulated DC or AC voltage, comprising an input rectifier circuit for rectifying said non-regulated AC voltage and a series regulator containing a gate-controllable transistor, which regulates the output voltage supplied to it by said rectifier to a first voltage value, characterized in that said transistor of said series regulator is a field-effect transistor (20) which in the ON condition charges a charging capacitor (46), the charging voltage of which forms said regulated output voltage, in that connected to a gate terminal (21) of said field-effect transistor (20) is a first threshold circuit (26, 28, 30, 32) receiving said non-regulated DC voltage which applies to said gate terminal (21) a voltage turning OFF said field-effect transistor (20) as soon as said non-regulated DC voltage exceeds a predetermined threshold value, and in that connected to said gate terminal (21) of said field-effect transistor (20) is a second threshold circuit (36, 38, 40, 22) receiving said regulated output DC voltage which applies to said gate terminal (21) a voltage turning OFF said field-effect transistor (20) as soon as said regulated output DC voltage exceeds a predetermined design value.
1 Assignment
0 Petitions
Accused Products
Abstract
A voltage regulator circuit for generating a regulated output DC voltage from a non-regulated DC or AC voltage, comprises an input rectifier circuit for rectifying the non-regulated AC voltage and a series regulator, containing a gate-controllable transistor, which regulates the output voltage supplied to it by the rectifier to a first voltage value. The transistor of the series regulator is a field-effect transistor (20) which in the ON condition charges a charging capacitor (46), the charging voltage of which forms the regulated output voltage. Connected to the gate terminal (21) of the field-effect transistor is a first threshold circuit (26, 28, 30, 32) receiving the non-regulated DC voltage which applies to this gate terminal (21) a voltage turning OFF the field-effect transistor (20) as soon as the non-regulated DC voltage exceeds a predetermined threshold value. Furthermore, connected to the gate terminal (21) of the field-effect transistor (20) is a second threshold circuit (36, 38, 40, 42) receiving the regulated output DC voltage which applies to this gate terminal (21) a voltage turning OFF the field-effect transistor (20) as soon as the regulated output DC voltage exceeds a predetermined design value.
-
Citations
4 Claims
- 1. A voltage regulator circuit for generating a regulated output DC voltage from a non-regulated DC or AC voltage, comprising an input rectifier circuit for rectifying said non-regulated AC voltage and a series regulator containing a gate-controllable transistor, which regulates the output voltage supplied to it by said rectifier to a first voltage value, characterized in that said transistor of said series regulator is a field-effect transistor (20) which in the ON condition charges a charging capacitor (46), the charging voltage of which forms said regulated output voltage, in that connected to a gate terminal (21) of said field-effect transistor (20) is a first threshold circuit (26, 28, 30, 32) receiving said non-regulated DC voltage which applies to said gate terminal (21) a voltage turning OFF said field-effect transistor (20) as soon as said non-regulated DC voltage exceeds a predetermined threshold value, and in that connected to said gate terminal (21) of said field-effect transistor (20) is a second threshold circuit (36, 38, 40, 22) receiving said regulated output DC voltage which applies to said gate terminal (21) a voltage turning OFF said field-effect transistor (20) as soon as said regulated output DC voltage exceeds a predetermined design value.
Specification