Current controlled switch mode power supply
First Claim
1. A power converter comprising:
- a single stage switching stage suppliable with a supply line current and a supply line voltage from a power source;
a controller coupled with the single stage switching stage, where the controller is operable to control the switching frequency of the switching stage to generate a switch generated voltage; and
a transformer having a primary winding and a secondary winding, where the transformer is wound to have a predetermined reflected voltage and is operable to receive the switch generated voltage at the primary winding; and
where the controller is operable to direct the single stage switching stage to vary the switch generated voltage as a function of the predetermined reflected voltage, and to selectively conduct the line current to the primary winding to create a substantially constant line current flow.
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Accused Products
Abstract
A single stage switch mode power converter receives a supply line voltage and a supply line current from a power supply line, and provides one or more regulated output voltages for a load, such as an amplifier. The power converter is operable to regulate the output voltage(s) using a controller that includes a voltage controlled current loop. The controller can enable substantially constant supply line current to be drawn from the power supply line by selectively allowing conduction of the supply line current through the power converter. A power factor of the supply line voltage and the supply line current may be optimized by the controller at medium to high power levels thereby maximizing the power provided to the switch mode power converter from the power supply line. Due to the adaptive nature of the controller, the power converter can operate over a wide range of supply line voltage.
90 Citations
44 Claims
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1. A power converter comprising:
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a single stage switching stage suppliable with a supply line current and a supply line voltage from a power source;
a controller coupled with the single stage switching stage, where the controller is operable to control the switching frequency of the switching stage to generate a switch generated voltage; and
a transformer having a primary winding and a secondary winding, where the transformer is wound to have a predetermined reflected voltage and is operable to receive the switch generated voltage at the primary winding; and
where the controller is operable to direct the single stage switching stage to vary the switch generated voltage as a function of the predetermined reflected voltage, and to selectively conduct the line current to the primary winding to create a substantially constant line current flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power converter comprising:
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a switching stage that includes a first set of switches and a second set of switches;
a controller coupled with the switching stage, where the controller is operable to control switching of the first set of switches and the second set of switches to enable the output of a first time variable voltage from the first set of switches and a second time variable voltage from the second set of switches; and
a transformer having a primary and a secondary, the transformer operable to receive a primary voltage representative of the combination of the first and second time variable voltages, where the controller is operable to control the primary voltage by variation of a relative phase difference between the first time variable voltage and the second time variable voltage based on a primary current suppliable to the transformer. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of manufacture of a power converter, the method comprising:
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providing a transformer having a primary winding and a secondary winding;
selecting a conduction voltage that is a lowest expected operating voltage;
designing a turns ratio of the primary winding and the secondary winding so that a reflected voltage of the secondary winding is about equal to the conduction voltage;
connecting an average line current circuit to measure a voltage across an inductor, where the measured voltage is useable to derive a supply line current that is shaped by a waveform of a primary voltage suppliable to the primary winding; and
configuring a plurality of switch position scenarios of a first set of switches and a second set of switches that are switchable to control the primary voltage to the selected conduction voltage so that the supply line current only flows to the primary winding during some of the switch position scenarios. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of converting power with a power converter, the method comprising:
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providing a supply line voltage and a supply line current to a first set of switches and a second set of switches;
switching the first set of switches with a controller to control a first voltage output of the first set of switches and to selectively conduct the supply line current through a switch included in the first set of switches;
switching the second set of switches with the controller to control a second voltage output of the second set of switches and to selectively conduct the supply line current through a switch included in the second set of switches;
combining the first voltage output with the second voltage output to form a primary voltage that is provided to a transformer having a predetermined conduction voltage;
calculating a magnitude of the supply line current supplied to the power converter as a function of a voltage across an inductor and a period of time when the supply line current is conducted through the first set of switches and the second set of switches; and
varying the relative phase of the first voltage output with respect to the second voltage output to control the primary voltage to the predetermined conduction voltage as a function of the calculated magnitude of the supply line current. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. A power converter comprising:
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a first set of switches coupled in parallel with a second set of switches, and configured to be coupled in parallel with a source of line voltage and line current; and
a controller coupled with the first and second sets of switches, where the controller is operable to output a first control signal to control the relative phase of a first voltage output from the first set of switches, and output a second control signal to control the relative phase of a second voltage output from the second set of switches such that the first voltage output is selectively lagging with respect to the second voltage output;
where the controller is operable to exchange the first control signal with the second control signal so that the second voltage output of the second set of switches becomes selectively lagging with respect to the first voltage output of the first set of switches. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. A method of controlling a power converter, the method comprising:
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switching a first set of switches with a first switching signal to control a first voltage output with the first set of switches;
switching a second set of switches with a second switching signal to control a second voltage output with the second set of switches;
selectively adjusting a relative phase of the first voltage with respect to the second voltage so that the first voltage lags the second voltage; and
exchanging the first switching signal with the second switching signal so that the second voltage lags the first voltage. - View Dependent Claims (41, 42, 43, 44)
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Specification