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Asymmetric hysteretic controller

A hysteresis and generator technology, applied in the field of hysteresis control, can solve problems such as hysteresis control and expensive

Active Publication Date: 2017-08-18
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These components result in significantly more expensive hysteresis control

Method used

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  • Asymmetric hysteretic controller

Examples

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Embodiment Construction

[0027] According to various embodiments of the invention, an asymmetric hysteretic controller may utilize a single analog input comparator, a fast rate-of-slew digital-to-analog converter (DAC) such as a pulse density modulation (PDM) DAC, and some digital control logic to implement. A fast switching DAC combined with an analog input comparator operates as a sequential windowed comparator with upper and lower limits. The fast rate of change DAC output races ahead of the observed sensed parameter to provide both a first threshold and a second threshold that can be used as a reference to cause the controlled system to operate in either the first state or the second state. For example, thermostats and heating / air conditioning equipment, LED lighting dimmer controls, DC / DC power conversion, etc. Additionally, digital logic controls the fast-slew rate DAC and comparator behavior. Selection of the upper and lower limits of the process variable can occur during a blanking period in...

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Abstract

An asymmetric hysteretic controller comprises an analog comparator coupled with a fast slew rate DAC, or a digital comparator coupled with an ADC plus some digital control logic. The comparator, analog or digital, operates as a sequential windowed comparator having high and low limits. The sense parameter is compared to a high or a low limit and when the sense parameter reaches the selected high or low limit, the controlled device is turned off or on, respectively. When the hysteretic controller state comparison reversal occurs: (a) the comparator output may be blanked by the control logic, (b) the comparator polarity may be reversed by the control logic, (c) the control logic may command the other process limit to be selected for comparison with the sense parameter, and (d) then the comparator output may be re-enabled.

Description

technical field [0001] The present invention relates to hysteretic control, and more particularly, to hysteretic control using sequential window comparators. Background technique [0002] In hysteretic control, a sensed parameter (eg, voltage, current, temperature, pressure, relative humidity, etc.) cycles between a first threshold and a second threshold (eg, upper / lower threshold and lower / upper threshold). No error amplifier or complex pole-zero filters are used or required. Hysteretic control is sometimes referred to as "bang-bang" control, where the system switches between two states (for example, on or off, high or low, hot or cold, fast or slow, up or down, right or left) , clockwise or counterclockwise, etc.) Hysteretic control turns on / off the controlled device when the sensed parameter is less than a first threshold and turns off / on the controlled device (eg, thermostats and heating / cooling systems) when the sensed parameter is greater than a second threshold. Sw...

Claims

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Application Information

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IPC IPC(8): H03K7/08
CPCH03K7/08G05B11/16H02M1/0003H03K3/02337
Inventor 布赖恩·克里斯
Owner MICROCHIP TECH INC
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