Non-isolated AC to DC power device
First Claim
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1. Apparatus comprising:
- a rectifier circuit;
an integrating circuit;
an analog current blocking (ACB) element connected in series between the rectifier circuit and the integrating circuit, wherein the ACB element has two or more operating modes including a low-resistance (LR) mode and a high-resistance (HR) mode, and wherein the HR mode has a resistance sufficient to substantially block current flow through the ACB element;
wherein the ACB element automatically transitions toward the HR mode when a current through the ACB element (IACB) reaches a limit current Ilimit, and wherein the ACB element automatically transitions toward the LR mode when a voltage across the ACB element (VACB) goes below a reset voltage Vreset;
wherein the ACB element is configured such that Ilimit and Vreset are controlled by application of a control signal to the ACB element; and
a feedback control loop configured to hold an output of the integrating circuit constant at a predetermined value by varying the control signal when input AC power is provided to the rectifier circuit.
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Abstract
An AC to DC power supply is provided based on feedback control of an analog current blocking (ACB) device. The ACB element receives rectified high voltage AC. The output of the ACB element is provided to an integrating circuit that provides an output DC voltage. The output DC voltage depends on the average current passed by the ACB element. The average current passed by the ACB element depends on the current limit of the ACB element, which is under feedback control.
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Citations
18 Claims
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1. Apparatus comprising:
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a rectifier circuit; an integrating circuit; an analog current blocking (ACB) element connected in series between the rectifier circuit and the integrating circuit, wherein the ACB element has two or more operating modes including a low-resistance (LR) mode and a high-resistance (HR) mode, and wherein the HR mode has a resistance sufficient to substantially block current flow through the ACB element; wherein the ACB element automatically transitions toward the HR mode when a current through the ACB element (IACB) reaches a limit current Ilimit, and wherein the ACB element automatically transitions toward the LR mode when a voltage across the ACB element (VACB) goes below a reset voltage Vreset; wherein the ACB element is configured such that Ilimit and Vreset are controlled by application of a control signal to the ACB element; and a feedback control loop configured to hold an output of the integrating circuit constant at a predetermined value by varying the control signal when input AC power is provided to the rectifier circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for providing output DC power from input AC power, the method comprising:
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rectifying the input AC power to provide a rectified signal; providing the rectified signal as an input to an analog current blocking (ACB) element, wherein the ACB element has two or more operating modes including a low-resistance (LR) mode and a high-resistance (HR) mode, and wherein the HR mode has a resistance sufficient to substantially block current flow through the ACB element; wherein the ACB element automatically transitions toward the HR mode when a current through the ACB element (IACB) reaches a limit current Ilimit, and wherein the ACB element automatically transitions toward the LR mode when a voltage across the ACB element (VACB) goes below a reset voltage Vreset; wherein an output waveform of the ACB element is the rectified signal having some parts automatically blocked by the ACB element; providing the output waveform of the ACB element as an input to an integrating circuit that provides an output DC signal; wherein the ACB element is configured such that Ilimit and Vreset are controlled by application of a control signal to the ACB element; and providing feedback control configured to hold the output DC signal constant at a predetermined value by varying the control signal. - View Dependent Claims (16, 17, 18)
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Specification