Power supply apparatus for producing a constant DC voltage from a range of AC inputs
First Claim
1. A power supply apparatus receiving one of a plurality of different AC voltages and producing a constant DC voltage regardless of which one of said plurality of different AC voltages is received, wherein an exciting current of a primary winding of a sole insulating converter transformer is switched by a switching circuit, and an oscillation state of an oscillating drive circuit connected to said switching circuit is controlled according to a secondary side output voltage of said sole insulating converter transformer for controlling said secondary side output voltage to result in said constant DC voltage, said power supply apparatus comprising:
- changing means under control of said oscillating drive circuit for providing a changing voltage to said switching circuit for changing over a supplying path of said exciting current between one of two modes of a full bridge action and a single ended push-pull or half bridge action, wherein the changing voltage fed to said switching circuit possesses hysteresis.
1 Assignment
0 Petitions
Accused Products
Abstract
A power source apparatus where an exciting current of a primary winding of an insulating converter transformer is switched by a switching element and an oscillation state of an oscillating drive circuit connected to the switching element is controlled according to a secondary side output voltage of the insulating converter transformer for controlling the secondary side output voltage to be a constant voltage. Under the control of the oscillating drive circuit, a supplying path of the exciting current is changed over between two modes of a full bridge action and a single ended push-pull or half bridge action.
37 Citations
6 Claims
-
1. A power supply apparatus receiving one of a plurality of different AC voltages and producing a constant DC voltage regardless of which one of said plurality of different AC voltages is received, wherein an exciting current of a primary winding of a sole insulating converter transformer is switched by a switching circuit, and an oscillation state of an oscillating drive circuit connected to said switching circuit is controlled according to a secondary side output voltage of said sole insulating converter transformer for controlling said secondary side output voltage to result in said constant DC voltage, said power supply apparatus comprising:
changing means under control of said oscillating drive circuit for providing a changing voltage to said switching circuit for changing over a supplying path of said exciting current between one of two modes of a full bridge action and a single ended push-pull or half bridge action, wherein the changing voltage fed to said switching circuit possesses hysteresis. - View Dependent Claims (2, 3, 4, 5, 6)
Specification