Full bridge phase displaced resonant transition circuit for obtaining constant resonant transition current from 0.degree. phase angle to 180.degree. phase angle
First Claim
1. A phase displaced, resonant transition circuit maintaining constant resonant transition current from 0°
- phase angle to 180°
phase angle, the circuit comprising;
a full bridge circuit having a first and second switch connected in series forming a first leg, and a third and fourth switch connected in series forming a second leg, said first and second legs connected in parallel with one another and in parallel with a power supply;
a primary winding, a first end of the primary winding connected to a junction of the first and second switches and a second end of the primary winding connected to a junction of the third and fourth switches;
a secondary winding inductively coupled to the primary winding, the secondary winding connected to a rectifying circuit supplying a controllable voltage to a load; and
a center tap leg including a resonant inductance and a capacitance, the inductance means connected at a first end in a center-tap arrangement to the primary winding, a second end of the resonant inductance connected to a first end of the capacitance, and a second end of the capacitance connected to circuit common.
5 Assignments
0 Petitions
Accused Products
Abstract
In a full-bridge phase displaced resonant transition circuit a center-tap is placed on the power transformer primary winding. The center-tap is connected to an inductor at one end with another end of the inductor connected to a large capacitor. The other end of the capacitor is connected to circuit common. During the time that a diagonal of the switching bridge is conducting, current will increase in the inductance of the power transformer primary winding. When the bridge changes to a horizontal conduction situation, the current in the power transformer primary winding will stop increasing and will essentially hold its value until the next diagonal conduction. Concurrently during the horizontal conduction the current in a resonant inductor will increase. When the bridge changes again to diagonal conduction the resonant inductor will stop increasing and essentially hold its value until the next horizontal conduction. Through this operation, at any given time there is current in one or the other inductances which is increasing and thus storing energy to be used for resonant transition even at zero phase no-load conditions.
-
Citations
19 Claims
-
1. A phase displaced, resonant transition circuit maintaining constant resonant transition current from 0°
- phase angle to 180°
phase angle, the circuit comprising;a full bridge circuit having a first and second switch connected in series forming a first leg, and a third and fourth switch connected in series forming a second leg, said first and second legs connected in parallel with one another and in parallel with a power supply; a primary winding, a first end of the primary winding connected to a junction of the first and second switches and a second end of the primary winding connected to a junction of the third and fourth switches; a secondary winding inductively coupled to the primary winding, the secondary winding connected to a rectifying circuit supplying a controllable voltage to a load; and a center tap leg including a resonant inductance and a capacitance, the inductance means connected at a first end in a center-tap arrangement to the primary winding, a second end of the resonant inductance connected to a first end of the capacitance, and a second end of the capacitance connected to circuit common. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
- phase angle to 180°
-
12. A method for maintaining a constant resonant transition current from 0°
- phase angle to 180°
phase angle in a full bridge phase displaced resonant transition circuit having switches constructed and operated at duty cycles ranging from 0% to 100%, the method comprising;inserting a center tap on a primary winding of the full bridge phase displaced resonant transition circuit with a first end of an inductor connected to the center tapped primary, a second end of the inductor connected to a first end of a capacitor and a second end of the capacitor connected to circuit common; operating the full bridge at 100% duty cycle wherein substantially all transformer core losses are at the primary winding and substantially zero voltage is on the inductor; and operating the full bridge at 0% duty cycle wherein maximum voltage is on the inductor and substantially zero voltage is on the primary, such that all transformer core losses are at the inductor. - View Dependent Claims (14, 15, 16)
- phase angle to 180°
-
17. A phase displaced, resonant transition circuit powered by a power supply, the circuit maintaining constant resonant transition current from 0°
- phase angle to 180°
phase angle, the circuit comprising;a full bridge circuit having at least four semiconductor switches to which control signals are applied; a transformer having a primary winding connected to the full bridge circuit and a secondary winding inductively coupled to the primary winding; a controller in operative connection with the full bridge circuit, the controller configured to supply the control signals to the switches; and an inductance capacitance network in operative connection with the primary winding and a circuit common. - View Dependent Claims (18, 19)
- phase angle to 180°
Specification