Resonant converter with controlled inductor
First Claim
1. A resonant converter having a fixed frequency AC supply and an LC resonant circuit driven by the supply to yield a DC output, the resonant circuit including:
- a series tank circuit including a resonant capacitor in series with a first inductor;
a parallel tank circuit including a controlled inductor connected in parallel with the resonant capacitor for varying the effective impedance of the capacitor;
the controlled inductor comprising a power winding on a core and a control winding; and
a control circuit including the control winding for continuously controlling the permeability of the core to thereby vary the inductance of the controlled inductor to regulate the DC output.
1 Assignment
0 Petitions
Accused Products
Abstract
An LC resonant circuit for a resonant converter includes a resonant capacitor and an inductor coupled to a fixed frequency AC supply. A controlled inductor in parallel with the resonant capacitor is controlled by a DC current to vary its inductance. The controlled inductor comprises a magnetic core having one or more power windings, and a control winding wound on the core. The DC current in the control winding produces core flux which effects core permeability. The controlled inductor has the effect of changing the capacitor impedance and thus influences the converter output. Multiple, independently controlled and regulated outputs may be driven by one power switching stage.
169 Citations
18 Claims
-
1. A resonant converter having a fixed frequency AC supply and an LC resonant circuit driven by the supply to yield a DC output, the resonant circuit including:
-
a series tank circuit including a resonant capacitor in series with a first inductor; a parallel tank circuit including a controlled inductor connected in parallel with the resonant capacitor for varying the effective impedance of the capacitor; the controlled inductor comprising a power winding on a core and a control winding; and a control circuit including the control winding for continuously controlling the permeability of the core to thereby vary the inductance of the controlled inductor to regulate the DC output. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A resonant converter having an AC supply with a fixed operating frequency and an LC resonant circuit driven by the supply to yield a DC output, the resonant circuit including:
-
a capacitor coupled to a first inductor and tuned to resonance at approximately twice the operating frequency; a controlled inductor having a power winding connected in parallel with the capacitor for varying the effective impedance of the capacitor, the controlled inductor having a variable permeability core and a minimum inductance in resonance with the capacitor at the operating frequency; and a control circuit for continuously controlling the inductance of the controlled inductor to thereby regulate the DC output. - View Dependent Claims (7, 8)
-
-
9. A resonant converter having a fixed frequency AC supply and a symmetrical LC resonant circuit driven by the supply to yield a DC output, the resonant circuit including:
-
a transformer having a primary winding; a capacitor and an inductor serially connecting each side of the primary winding to the AC supply; a controlled inductor having a pair of power windings each connected in parallel with one of the capacitors for varying the effective impedance of the capacitors, and having a control winding; and a control circuit for continuously controlling the control winding of the controlled inductor to thereby regulate the DC output. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification