Imported: 23 Feb '17 | Published: 22 Oct '02
USPTO - Utility Patents
A circuit simulating the function of a diode in the sense that it conducts current in one direction and blocks current in the opposite direction, but which has a low forward voltage drop. A voltage comparator and a three terminal switch are connected so that the intrinsic reverse diode associated with the switch is harnessed to conduct current in the direction in which it is desired to conduct current and to block current in the direction in which it is desired to block current. A voltage comparator controls the control terminal of the three terminal switch to turn on the switch to conduct current and to interrupt current. Alternate embodiments of voltage comparators are disclosed. The voltage comparator may include charging and discharging transistors so that the switch turns on and off at a high speed. The invention further includes a method of conducting current in one direction and blocking current in a second direction which reduces power losses.
The above and other objects, aspects, features and advantages of the invention will be more readily apparent from the description of the preferred embodiments thereof taken into conjunction with the accompanying drawings and appended claims.
The invention is illustrated by way of example and not limitation in the figures of the accompanying drawings in which like references denote like or corresponding parts and in which:
1. A circuit for improving switching performance of a three terminal switch comprising:
2. A circuit according to
3. A circuit according to
4. A circuit according to
5. A circuit according to
6. A circuit according to
7. A method according to
8. A circuit with two terminals A and K, which conducts current in one direction from terminal A to terminal K and blocks current in an opposite direction from terminal K to terminal A, comprising:
9. A circuit according to
10. A circuit according to