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Hysteretic power converter with calibration circuit

Active Publication Date: 2015-05-27
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overall loop delay derived from the comparator output corresponding to each high-side / low-side switch also causes the threshold level to vary with PVT
Variations in thresholds cause errors in controlled voltage and current

Method used

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  • Hysteretic power converter with calibration circuit
  • Hysteretic power converter with calibration circuit
  • Hysteretic power converter with calibration circuit

Examples

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Embodiment Construction

[0022] The making and using of various embodiments of the invention are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable concepts that can be implemented in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0023] Figure 1A is a schematic diagram illustrating an exemplary hysteretic power converter (buck converter) with a calibration circuit according to some embodiments. The hysteretic power converter 100 includes a hysteretic comparator 102, a calibration circuit 104, a switch S1, a diode 105, an inductor L1, a capacitor C1, a load 106, (eg, a light emitting diode (LED)), a buffer 107, and a resistor R1. Resistor R1 determines the level of load 106 . Although the hysteresis power converter 100 is considered as Figure 1A The driver of the LED in is used, but for differe...

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PUM

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Abstract

A hysteretic power converter includes a comparator, a calibration circuit, and an output node having an output voltage. The calibration circuit is configured to supply a calibrated voltage to the comparator. The comparator controls the output voltage based on the calibrated voltage and a feedback voltage representing at least a portion of the output voltage.

Description

technical field [0001] The present invention relates generally to a power converter, and more particularly to a hysteretic power converter. Background technique [0002] Power converters (eg, direct current (DC) to DC power converters) are used in many circuit applications, eg, light emitting diode (LED) drive circuits. A DC-DC power converter includes a hysteretic comparator with a reference voltage as one of its inputs. The controlled voltage of the power converter is compared with the hysteresis level, and if the controlled voltage level is lower than the low threshold point, the high side switch is turned on, and if the controlled voltage level is higher than the high threshold point, the high side switch is turned on. through the low side switch. [0003] However, the response time of the hysteretic comparator and / or the loop delay cause conventional DC-DC power converters to suffer from output offset problems, which cause output current errors. In integrated circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00
CPCG05F1/00G05F1/10G05F1/40G05F1/56G05F1/575H02M3/156G05F1/66G01R1/203
Inventor 戴嘉良罗许·艾伦索南·艾瑞克
Owner TAIWAN SEMICON MFG CO LTD