Resonant converter with phase controlled switching
First Claim
1. A circuit arrangement for a converter with switches for chopping an input DC voltage into a chopped DC voItage, comprisingcontrol means for controlling the switch-on times of the switches, in which switch-on times of the switches alternate with each other and are separated from each other by dead-time phases, andcircuit elements comprising a resonant circuit having at east one capacitor and at least one coil for converting the chopped DC voltage into an output voltage,wherein:
- means for determining current flowing in the resonant circuit are provided,the control means include a comparator that compares a value dependent on the current flowing in the resonant circuit with a threshold value, andthe circuit means control the switching of the switches in dependence upon the comparison result to control the dead-time phases.
2 Assignments
0 Petitions
Accused Products
Abstract
In a switching DC converter with a resonant circuit output stage, the energy remaining in the resonant circuit for switching the switches of the converter in an inductive mode of operation is used to control the phase of switching. The turn-on phase of each switch is controlled to assure zero voltage switching, and the turn-off phase of each switch is controlled to assure that the resonant circuit has sufficient energy to provide this zero voltage switching.
11 Citations
21 Claims
-
1. A circuit arrangement for a converter with switches for chopping an input DC voltage into a chopped DC voItage, comprising
control means for controlling the switch-on times of the switches, in which switch-on times of the switches alternate with each other and are separated from each other by dead-time phases, and circuit elements comprising a resonant circuit having at east one capacitor and at least one coil for converting the chopped DC voltage into an output voltage, wherein: -
means for determining current flowing in the resonant circuit are provided, the control means include a comparator that compares a value dependent on the current flowing in the resonant circuit with a threshold value, and the circuit means control the switching of the switches in dependence upon the comparison result to control the dead-time phases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of controlling a pair of switches in a switching converter that provide a chopped DC voltage that is coupled to a resonant circuit, the method comprising:
-
determining a measure of energy in the resonant circuit, and determining a phase at which to close each switch so as to achieve substantialty zero voltage switching at each switch, based on the measure of energy in the resonant circuit, and controlling each switch based on each determined phase. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. A resonant converter comprising:
-
a pair of switches that are configured to produce a chopped DC voltage from an input voltage, a resonant circuit that is configured to produce an output voltage from the chopped DC voltage, a control circuit that is configured to control the switches based on a measure of energy in the resonant circuit, wherein each switch is independentiy controlled by the control circuit, and the control circuit is configured to control each turn-on phase of each switch to achieve substantially zero voltage switching at each switch based on the measure of energy in the resonant circuit. - View Dependent Claims (17, 18, 19, 20, 21)
-
Specification