Dual output DC-DC converter with independently controllable output voltages
First Claim
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1. A DC-DC converter comprising:
- a transformer having a primary winding, a tightly-coupled secondary winding having substantially no leakage inductance, and a loosely-coupled secondary winding having a predetermined leakage inductance;
DC to AC conversion means connected to said primary winding and adapted to be connected to a DC supply, said DC to AC conversion means for supplying a variable frequency, variable duty cycle AC signal to said primary winding;
first rectifying means coupled to said tightly-coupled secondary winding for providing a first DC output voltage;
second rectifying means coupled to said loosely-coupled secondary winding for providing a second DC output voltage; and
controller means coupled to said first and said second rectifying means and to said DC to AC conversion means for adjusting the duty cycle of said AC signal to regulate said first DC output voltage in response to a first voltage command and for adjusting the frequency of said AC signal to regulate said second DC output voltage in response to a second voltage command.
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Abstract
A single DC power switching converter feeds two DC load circuits from two transformer secondary windings. One winding is tightly coupled to the primary and its output voltage is controlled using pulse-width modulation. The other secondary winding is loosely coupled to the primary so that its leakage inductance resonates with a secondary capacitor such that its output is controlled by converter frequency adjustment. Thus, both output voltages are controlled using a single power switching stage.
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9 Claims
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1. A DC-DC converter comprising:
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a transformer having a primary winding, a tightly-coupled secondary winding having substantially no leakage inductance, and a loosely-coupled secondary winding having a predetermined leakage inductance; DC to AC conversion means connected to said primary winding and adapted to be connected to a DC supply, said DC to AC conversion means for supplying a variable frequency, variable duty cycle AC signal to said primary winding; first rectifying means coupled to said tightly-coupled secondary winding for providing a first DC output voltage; second rectifying means coupled to said loosely-coupled secondary winding for providing a second DC output voltage; and controller means coupled to said first and said second rectifying means and to said DC to AC conversion means for adjusting the duty cycle of said AC signal to regulate said first DC output voltage in response to a first voltage command and for adjusting the frequency of said AC signal to regulate said second DC output voltage in response to a second voltage command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification