ELEVATOR MOTOR POWER SUPPLY CONTROL
First Claim
1. A power supply assembly, comprising:
- a drive device having an input side and an output side for providing power to a motor, the drive device including a bus capacitor;
a switch associated with the input side of the drive device for selectively connecting the input side of the drive device to a power supply;
an inductor having an impedance that limits an amount of current supplied to the bus capacitor during an initial charging of the bus capacitor when the switch connects the input side of the drive device to the power supply; and
a restrictive circuit portion associated with the input side for dampening a resonance effect of the inductor, the restrictive circuit portion having a resistance that allows the bus capacitor to charge quickly, the impedance of the inductor having a more significant effect on how quickly the bus capacitor charges than an effect of the resistance, a dampening factor of the restrictive circuit being based on a relationship between a capacitance of the bus capacitor, an inductance of the inductor and the resistance such that the dampening factor controls a voltage of the bus capacitor during the charging of the bus capacitor.
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Accused Products
Abstract
An exemplary power supply assembly includes a drive device having a bus capacitor. A switch associated with an input side of the drive device selectively connects the drive device to a power supply. An inductor has an impedance that limits an amount of current supplied to the bus capacitor during an initial charging of the bus capacitor when the switch connects the input side of the drive device to the power supply. A restrictive circuit portion dampens a resonance effect of the inductor. The restrictive circuit portion has a resistance that allows the bus capacitor to charge quickly. The impedance of the inductor has a more significant effect on how quickly the bus capacitor charges than an effect of the resistance. A dampening factor of the restrictive circuit controls a voltage of the bus capacitor during the charging of the bus capacitor.
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Citations
20 Claims
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1. A power supply assembly, comprising:
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a drive device having an input side and an output side for providing power to a motor, the drive device including a bus capacitor; a switch associated with the input side of the drive device for selectively connecting the input side of the drive device to a power supply; an inductor having an impedance that limits an amount of current supplied to the bus capacitor during an initial charging of the bus capacitor when the switch connects the input side of the drive device to the power supply; and a restrictive circuit portion associated with the input side for dampening a resonance effect of the inductor, the restrictive circuit portion having a resistance that allows the bus capacitor to charge quickly, the impedance of the inductor having a more significant effect on how quickly the bus capacitor charges than an effect of the resistance, a dampening factor of the restrictive circuit being based on a relationship between a capacitance of the bus capacitor, an inductance of the inductor and the resistance such that the dampening factor controls a voltage of the bus capacitor during the charging of the bus capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling power supply to a motor, comprising the steps of:
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selectively connecting an input side of a drive device to a power supply for providing power to the motor through an output side of the drive device; charging a bus capacitor of the drive device during a power on time when the drive device is connected to the power supply; restricting a flow of current at the input side of the drive device using an impedance of an inductor during the power on time; and dampening a resonance effect of the inductor using a restrictive circuit portion having a resistance that allows the bus capacitor to charge quickly, the impedance of the inductor having a more significant effect on how quickly the bus capacitor charges than an effect of the resistance, a dampening factor of the restrictive circuit being based on a relationship between a capacitance of the bus capacitor, an inductance of the inductor and the resistance such that the dampening factor controls a voltage of the bus capacitor during the charging of the bus capacitor. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification