Simplified Device Circuit Implementing Comparator/Latch Functions for Chopper Drives
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Chopper-type circuits, such as those used for electric motors, drivers commonly employ comparator and latch functions. However, such functions are typically quite complex and somewhat extravagant in terms of the devices required (i.e., "device-intensive"). The circuit described in this article represents a minimum device implementation of the comparator and latch functions commonly utilized in such chopper circuits. All chopper circuits for constant control of current require a comparator to compare the sense voltage to a reference voltage; in addition, they require a latch to "remember" the state of the chopper (i.e., on or off). When such chopper circuits are designed into integrated circuits, the implementation of these functions, as previously noted, tends to be quite device-intensive.