Fan motor power-off automatic braking circuit
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United States of America Patent
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Jun 12, 2018
Issued Date -
N/A
app pub date -
Jan 15, 2017
filing date -
Jan 15, 2017
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fan motor power-off automatic braking circuit includes an energy storage unit, a motor drive circuit, a control unit and a resistance unit connected with an input power. The energy storage unit is electrically connected with the motor drive circuit for receiving and storing an operation voltage. The motor drive circuit has multiple upper arm switch components, multiple lower arm switch components, a first drive unit and a second drive unit. The control unit is respectively electrically connected with the lower arm switch components and the first and second drive units. When the fan is powered off, the energy storage unit provides the operation voltage to the upper arm switch components to switch on the same, whereby the upper arm switch components and the motor winding form a closed loop to achieve braking effect.
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