Power supply for low-voltage DC motor

Details Power supply for low-voltage DC motor Power supply for low-voltage DC motor

1994-10-20

1997-07-29

Sircus, Brian

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

318814, 363 89, 323282, 323351, 320 1, 320 32, 320 39, H02P 300

Patent

active

056528256

ABSTRACT:
An improved power supply for converting any of various standard national AC network voltages to low-voltage DC power suitable for driving a 1 or 2-watt device, such as a fan, features a semiconductor control circuit (18, FET 46) which chops each half-wave of a rectified voltage and uses the low-voltage portions to feed charging current pulses to a storage capacitor. The voltage on the capacitor (14) is used by other portions of the circuit to regulate rotation speed of the fan or other consuming device (40) to a value set on a variable resistor. The use of the low-voltage portions of the input signal reduces power losses and increases efficiency.

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Harris Semiconductor, "HV-2405E World-Wide Single Chip Power Supply," Oct. 1992, Harris Corp., Melbourne, Florida.
Harris Semiconductor, "IGBTs (Insulated Gate Bipolar Transistors)" in Discrete Power Selection Guide, p. 2-1, publ. Feb. 1994 by Harris Corp., Melbourne, Florida.

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