Over-current protection method and device
A method and device to protect a drive circuit ( 32 ) of a power assist motor ( 22 ) from an over-current condition. A sensor ( 24 ) takes instantaneous measurements of the current provided to the motor ( 22 ). A charge accumulation determining function ( 28 ) determines charge accumulation from the...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A method and device to protect a drive circuit (
32
) of a power assist motor (
22
) from an over-current condition. A sensor (
24
) takes instantaneous measurements of the current provided to the motor (
22
). A charge accumulation determining function (
28
) determines charge accumulation from the instantaneous current samples. When the current provided to the motor (
22
) exceeds a threshold value (
40
) and the determined charge accumulation exceeds a threshold charge accumulation (
50
), the current provided to the motor (
22
) is decreased. When the current provided to the motor (
22
) is less than the threshold current value (
40
) for more than a predetermined period, the determined charge accumulation is reduced by a predetermined factor. After the charge accumulation has been reduced below a predetermined threshold (
92
), the current provided to the motor (
22
) is increased. |
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