Power supply capable of AC and DC input utilizing winding of transformer as boost inductor
First Claim
1. A method to output a regulated voltage from a power converter, comprising:
- directly receiving a DC input voltage at a center tap of a secondary winding of the transformer, the transformer being coupled to a first switching device and also including a primary winding, the center tap of the transformer separating the secondary winding of the transformer into a first autowinding and a second autowinding;
charging a first capacitor to a first DC voltage corresponding to the DC input voltage by coupling the DC input voltage across the first capacitor;
charging a second capacitor to a second DC voltage corresponding to the DC input voltage by utilizing a control circuit and second switching devices to control the first autowinding and the second autowinding of the transformer to apply the second voltage across the second capacitor; and
adding at a first node, the first DC voltage and the second DC voltage to generate a third DC voltage, wherein the first switching device and the second switching devices are driven by signals operating at a common frequency.
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Accused Products
Abstract
A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary winding of the transformer. A transformed voltage is output. A rectifier receives the transformed voltage and outputs a DC voltage. A buck regulator receives a DC voltage, creates a regulated voltage, and outputs the regulated voltage and a regulated current to a portable appliance. A error correction system receives a programming signal and regulated signals and verifies that the regulated signal to programming signal ratio is within an acceptable range.
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Citations
20 Claims
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1. A method to output a regulated voltage from a power converter, comprising:
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directly receiving a DC input voltage at a center tap of a secondary winding of the transformer, the transformer being coupled to a first switching device and also including a primary winding, the center tap of the transformer separating the secondary winding of the transformer into a first autowinding and a second autowinding; charging a first capacitor to a first DC voltage corresponding to the DC input voltage by coupling the DC input voltage across the first capacitor; charging a second capacitor to a second DC voltage corresponding to the DC input voltage by utilizing a control circuit and second switching devices to control the first autowinding and the second autowinding of the transformer to apply the second voltage across the second capacitor; and adding at a first node, the first DC voltage and the second DC voltage to generate a third DC voltage, wherein the first switching device and the second switching devices are driven by signals operating at a common frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power converter, comprising:
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a transformer, said transformer having a primary winding and a secondary winding, the primary winding coupled to a first switching circuit and the secondary winding including a center tap to separate the secondary winding into a first autowinding and a second autowinding, the DC input voltage being connected to the center tap of the secondary winding of the transformer; a first capacitor, coupled to the DC input voltage, which is charged to a first voltage corresponding to the DC input voltage; and a control circuit coupled to a second switching circuit, the second switching circuit coupled to the secondary winding, wherein the control circuit and the second switching circuit control the first autowinding and the second autowinding to charge a second capacitor to a second DC voltage corresponding to the DC input voltage, wherein the first DC voltage and the second DC voltage are added together to create a third DC voltage, and the first switching circuit and the second switching circuit are driven by signals having a common frequency. - View Dependent Claims (8, 9, 10, 11)
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12. A power converter, comprising:
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a transformer, coupled to a first switching circuit, said transformer having a primary winding and a secondary winding, the primary winding coupled to a first switching circuit and the secondary winding including a center tap to separate the secondary winding into a first autowinding and a second autowinding, the DC input voltage being directly applied to the center tap of the secondary winding of the transformer; and a control circuit, coupled to a second switching circuit, the second switching circuit coupled to the secondary winding, wherein the control circuit and the second switching circuit control the first autowinding and the second autowinding to output a combined voltage, the combined voltage being an addition of a voltage across the first autowinding and a voltage across the second autowinding, wherein the first switching circuit and the second switching circuit operate at a common frequency. - View Dependent Claims (13, 14, 15)
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16. A method to output a regulated voltage from a power converter, comprising:
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receiving a DC input voltage at a center tap of a secondary winding of a transformer, the transformer also having a primary winding coupled to a first switching circuit, the center tap of the secondary winding dividing the transformer into a first autowinding and a second autowinding; driving a second switching circuit from a control circuit, the second switching circuit coupled to the secondary winding, wherein the control circuit and the second switching circuit control the first autowinding and second autowinding to output a combined voltage, the combined voltage being an addition of a voltage across the first autowinding and a voltage across the second autowinding, wherein the first switching circuit and the second switching circuit are driven to operate at a common frequency; and outputting the combined voltage as a DC output voltage. - View Dependent Claims (17, 18, 19, 20)
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Specification