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Digital Fixed On-Time Controller for DC-DC Converters

A fixed on-time, DC converter technology, applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., can solve the output voltage offset error and reduce the adjustment of the DC converter Efficiency and other issues to achieve the effect of offsetting the output voltage offset

Active Publication Date: 2022-03-15
NCKU RES & DEV FOUND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this mechanism produces an output voltage offset error, which degrades the regulation performance of the DC converter

Method used

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  • Digital Fixed On-Time Controller for DC-DC Converters
  • Digital Fixed On-Time Controller for DC-DC Converters
  • Digital Fixed On-Time Controller for DC-DC Converters

Examples

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Embodiment Construction

[0062] Figure 1A A circuit diagram showing a direct current (DC-to-DC) converter 100 with output voltage offset cancellation disclosed in U.S. Application No. 16 / 153,467 filed October 5, 2018 by the present applicant, currently U.S. Patent No. 10,291,121, entitled "DC-TO-DC CONVERTER AND ADIGITAL CONSTANT ON-TIME CONTROLLER THEREOF." The DC converter 100 may include a switching circuit 11 for generating a switching voltage Vx. Wherein, the switching circuit 11 may include a first switching device Mp and a second switching device Mn connected in series between the power supply 111 and the ground. The power supply 111 provides an input voltage Vin. The switching voltage Vx is located at a switching node Vx between the first switching device Mp and the second switching device Mn.

[0063] The DC converter 100 may include an energy storage circuit 12 for receiving a switching voltage Vx to generate a regulated output voltage Vo for providing to a load. Wherein, the energy stor...

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Abstract

A digital constant on-time controller suitable for a DC converter, including a current sensing circuit that senses stored energy of the DC converter to generate a sensing voltage; a half-amplitude detector that detects the sensing voltage half of the peak-to-peak value of , thereby producing a half-amplitude voltage; a DC voltage detector, which detects a DC voltage across an effective series resistor in an energy storage circuit providing stored energy, thereby producing a DC voltage; an arithmetic device whose Adding sensing voltage and half-amplitude voltage, subtracting DC voltage and preset reference signal; and pulse width modulation generator, which generates switching control signal according to the result of arithmetic device. The technical solution provided by the invention can effectively improve the output voltage offset.

Description

technical field [0001] The present invention relates to a DC-to-DC converter, in particular to a DC converter with output voltage offset cancellation. Background technique [0002] A power converter is an electronic circuit that converts electrical energy from one form to another. A DC-to-DC converter is a type of power converter used to convert a DC source from one voltage level to another. In a DC converter, an inductor is usually placed between the switching circuit and the output node to store energy. [0003] The DC converter usually uses an analog current sensing circuit to sense the inductor current to control the switching of the switching circuit. For a constant on-time (COT) DC converter, a ripple-based analog control is used to compare the sensing inductor current with a reference voltage, thereby generating a control signal to control switching of the switching circuit. However, this mechanism will generate an output voltage offset error, thereby degrading the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157
CPCH02M3/157
Inventor 胡恺育蔡建泓
Owner NCKU RES & DEV FOUND