Patent ID: 8288897
Filing Date: 2012-10-16
Classification: B02C

Abstract:
1. A smart speed control, power-saving and noise-reduction paper shredder, comprises an electric machine unit, a current inspection feedback unit, a gear-switching voltage-modulating and speed-regulating unit and a power supply, wherein an input terminal of the gear-switching voltage-modulating and speed-regulating unit is connected to an output terminal of the current inspection feedback unit, and an output terminal is connected to an input terminal of the electric machine unit wherein the current inspection feedback unit includes a dual-channel comparator and a dual-relay driver circuit, both composed of operational amplifiers, wherein a first control signal output terminal and a second control signal output terminal of the dual-channel comparator are coupled to a control terminal of the dual-relay driver circuit, and a sample voltage input terminal of the dual-channel comparator is connected to a current sample resistor of an electric machine of the electric machine unit.