Delta-sigma modulation for power converter control

A technology of converters and switching elements, applied in the direction of output power conversion devices, control/regulation systems, DC power input conversion to DC power output, etc.

Active Publication Date: 2017-06-20
INFINEON TECH AUSTRIA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0001] Various challenges exist regarding increasing the durability and / or efficiency of switch-mode power converters

Method used

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  • Delta-sigma modulation for power converter control
  • Delta-sigma modulation for power converter control
  • Delta-sigma modulation for power converter control

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Embodiment Construction

[0020] Delta Sigma modulation is a technique used in digital signal processing (DSP) to encode an analog signal into a high-resolution digital signal that can then be transmitted, decoded, and converted back to analog form. For example, in a conventional analog-to-digital converter (ADC), the ADC integrates or samples an analog signal at a specific sampling frequency, and then quantizes the sampled analog signal into digital form.

[0021] Delta-sigma modulation performs two steps to reduce error noise in the ADC process. First, the delta-sigma modulator computes the delta (eg, difference) between the current sample of the analog signal and the previous sample of the analog signal. The delta sigma modulator then integrates the deltas and digitizes the integrated deltas into a digital bit stream (eg 1 bit using a comparator) at an oversampling frequency, which is typically much higher than the highest digital frequency. Next, a delta-sigma modulator converts the digital bit st...

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Abstract

A flyback converter is described that in some examples includes an integrated circuit that includes a delta-sigma converter and a cascaded integrator-comb filter configured to determine: a proportional factor, an integral factor, and a derivative factor associated with a secondary-side voltage across a secondary-side winding of the converter. The integrated circuit uses each factor to control a secondary switching element to perform synchronous rectification. In some examples, the flyback converter includes an auxiliary winding at the primary side of the transformer and a knee point voltage detection unit. The knee point voltage detection unit is configured to determine, based on an analog input indicative of a voltage at the auxiliary winding, an integral of value and detect, based on the integral value, a knee point voltage associated with the voltage at the auxiliary winding. A controller may use the detected knee point to control a primary side switch.

Description

Background technique [0001] Various challenges exist regarding increasing the durability and / or efficiency of switch mode power converters. Rather than having to use more robust materials and components, a switch-mode power converter can improve performance through more precise control of its switching. A controller of a switch mode power converter can control its switching more precisely by obtaining more accurate information about the operating state or condition of the components of the power converter. For example, some controllers rely on very accurate analog measurements of voltage and current levels at different parts of the system to determine whether to change the operating state of a switch. [0002] Some switch-mode power converters include a transformer that provides a galvanic isolation barrier between a power source and a load. The controller of such a power converter can also improve the control of its switches by obtaining information about the operating stat...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10H02M3/33523H02M3/33576H02M3/33507H02M3/33515
Inventor W·福特纳弓小武
Owner INFINEON TECH AUSTRIA AG
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