Multi-Resonance converter
First Claim
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1. A multi-resonance converter, for converting a first DC voltage into a second DC voltage, the convertor comprising:
- a half-bridge including two semiconductor switches and having an output formed by a connection point of the two semiconductor switches;
a resonance capacitor;
a transformer having a primary winding and a secondary winding, the output of the half-bridge connected to the primary winding through the resonance capacitor;
two rectifier elements;
an output inductor, the secondary winding connected to the output inductor through the two rectifier elements;
an output capacitor connected to the two rectifier elements through the output inductor; and
a controller configured to be supplied with a voltage across the output capacitor and a reference voltage, the controller further configured to control switching of the semiconductor switches alternately so that one of the semiconductor switches is respectively turned on at a predetermined time after the other semiconductor switch is turned off, andcharacterized in that in a lower range of power drawn from the converter, a mark-space ratio of the converter is controlled for selected respectively constant frequencies, the periods for the selected frequencies given by T1p=(n+½
)*T0, where n is an integer depending on the drawn power and T0 is the period of the oscillation, the frequency of which is dictated by the resonance capacitor and the series circuit of a stray inductance and a main inductance of the transformer.
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Abstract
In a multi-resonance converter for converting a first DC voltage into a second DC voltage, wherein the output of a half-bridge comprising semiconductor switches is connected through a resonance capacitor to the primary winding of a transformer and the secondary winding of the transformer, together with rectifier elements, an output inductor and an output capacitor, forms a current output, it is proposed that a controller, which can be supplied which the voltage across the output capacitor and a reference voltage, should control the semiconductor switches alternately so that one of the semiconductor switches is respectively turned on at a predetermined time after the other semiconductor switch is turned off. Preferably, the frequency is controlled in an upper range of the drawn power while in a lower range of the drawn power, the mark-space ratio is controlled for selected respectively constant frequencies.
17 Citations
10 Claims
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1. A multi-resonance converter, for converting a first DC voltage into a second DC voltage, the convertor comprising:
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a half-bridge including two semiconductor switches and having an output formed by a connection point of the two semiconductor switches; a resonance capacitor; a transformer having a primary winding and a secondary winding, the output of the half-bridge connected to the primary winding through the resonance capacitor; two rectifier elements; an output inductor, the secondary winding connected to the output inductor through the two rectifier elements; an output capacitor connected to the two rectifier elements through the output inductor; and a controller configured to be supplied with a voltage across the output capacitor and a reference voltage, the controller further configured to control switching of the semiconductor switches alternately so that one of the semiconductor switches is respectively turned on at a predetermined time after the other semiconductor switch is turned off, and characterized in that in a lower range of power drawn from the converter, a mark-space ratio of the converter is controlled for selected respectively constant frequencies, the periods for the selected frequencies given by T1p=(n+½
)*T0, where n is an integer depending on the drawn power and T0 is the period of the oscillation, the frequency of which is dictated by the resonance capacitor and the series circuit of a stray inductance and a main inductance of the transformer. - View Dependent Claims (2, 3, 4, 5)
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6. A multi-resonance converter, for converting a first DC voltage into a second DC voltage, the convertor comprising:
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a half-bridge including two semiconductor switches and having an output formed by a connection point of the two semiconductor switches; a resonance capacitor; a transformer having a primary winding and a secondary winding, the output of the half-bridge connected to the primary winding through the resonance capacitor; two rectifier elements; an output inductor, the secondary winding connected to the output inductor through the two rectifier elements; an output capacitor connected to the two rectifier elements through the output inductor; and a controller configured to be supplied with a voltage across the output capacitor and a reference voltage, the controller further configured to control switching of the semiconductor switches alternately so that one of the semiconductor switches is respectively turned on at a predetermined time after the other semiconductor switch is turned off, and characterized in that the controller is a programmable device configured to derive a period as a function of the voltage across the output capacitor and the reference voltage, to compare the derived period with periods of a maximum frequency and selected frequencies, and to supply control signals to the semiconductor switches as a function of frequency and mark-space ratio. - View Dependent Claims (7, 8, 9, 10)
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Specification
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Current AssigneeNXP B.V. (NXP Semiconductors NV)
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Original AssigneeNXP B.V. (NXP Semiconductors NV)
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InventorsElferich, Reinhold, Schetters, Cornelis, De Groot, Humphrey, Sauerlander, Georg
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Primary Examiner(s)HAN, YOUNGHUIE JESSICA
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Application NumberUS11/719,919Publication NumberTime in Patent Office1,590 DaysField of Search363/17, 363/21.02, 363/98, 363/131, 363/132US Class Current363/17CPC Class CodesH02M 3/3382 in a push-pull circuit arra...
