Abstract: The grinder dolly is configured for use with a disk grinder. The disk grinder further comprises a grinder motor and a grinding disk. The grinder dolly is a wheeled bracket. The disk grinder attaches to the grinder dolly such that the grinding disk can be used to grind or polish a supporting surface. The grinder dolly comprises a handle, a plurality of wheels, and a power distribution system. The disk grinder attaches to the handle. The plurality of wheels are used to roll the disk grinder over the supporting surface. The power distribution system provides electrical energy to the disk grinder.

Abstract: A bi-directional comparator compares two input signals and applies a hysteresis level to the smaller input signal only after the output signal switches logical states and when the two input signals are within a predetermined range of each other. In one embodiment, the hysteresis applied to the smaller input signal is removed when the two input signals are no longer within the predetermined range of each other.

Abstract: In one embodiment, a power supply controller of a power supply system uses an algorithm to reduce the number of drive pulses to the output transistors under light load conditions. The algorithm groups the drive pulses to the output transistors into sets and removes some of the drive pulses for each set drive pulses issued by the controller. Each successive set removes additional drive pulses.