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Patent Searching and Data


Title:
RIPPLE COUNT CIRCUIT INCLUDING VARYING RIPPLE THRESHOLD DETECTION
Document Type and Number:
WIPO Patent Application WO/2019/137933
Kind Code:
A1
Abstract:
A motor control system includes a variable voltage supply in signal communication with a direct current (DC) motor. The DC motor includes a rotor induced to rotate in response to a drive current generated by a variable supply voltage delivered by the voltage supply. The rotation of the rotor (103) generates a mechanical force that drives a component. A ripple count circuit (104) is configured to filter the drive current based on a rotational speed (ω) of the rotor (103) to generate a filtered drive current signal, and to generate a varying threshold based on the filtered drive current signal. Based on a comparison between the filtered drive current signal and the varying threshold, the ripple count circuit (104) generates a pulsed output signal indicative of the rotational speed (ω) of the rotor and a rotational position (θ) of the rotor.

Inventors:
BREYNAERT FRANÇOIS (FR)
HERPIN SIMON (FR)
Application Number:
PCT/EP2019/050393
Publication Date:
July 18, 2019
Filing Date:
January 09, 2019
Export Citation:
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Assignee:
INTEVA PRODUCTS FRANCE SAS (FR)
International Classes:
H03K23/58
Foreign References:
FR3030152A12016-06-17
EP0333572A11989-09-20
US4707650A1987-11-17
Other References:
None
Attorney, Agent or Firm:
CABINET GERMAIN & MAUREAU (FR)
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