Abstract: Circuits, methods, and systems are directed to controlling the amount and polarity of current to multiple loads with switches, where the loads share switching components. The loads may be thermoelectric elements, which heat or cool based on the state of the switches. The switches may be run in a single mode during a duty cycle, or multiple successive modes during the duty cycle to achieve full control of the loads.
Type:
Grant
Filed:
May 11, 2006
Date of Patent:
March 2, 2010
Assignee:
Bio-Rad Laboratories, Inc.
Inventors:
Robert Alan Iovanni, Peter Edward Cann, David J. Kelley
Abstract: In an amplifier using at least two transistors are amplifying elements, the bases (or gates) and the collectors (or drains) of the transistors are commonly connected. A first impedance element is connected between the bases (or gates) and the collectors (or drains). A second impedance element is connected between an emitter (or source) of each transistor and a ground. A third impedance element is connected between the emitters (or sources).
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