Circuit simulating a diode
First Claim
1. A circuit for improving switching performance of a three terminal switch comprising:
- said three terminal switch having a source for electrons, a drain for electrons, and a control terminal having an internal capacitance between the control terminal and the source for electrons; and
means for amplifying a current for modifying a charged state of said internal capacitance;
wherein said means for amplifying the current comprises a transistor having an emitter, collector, and base;
said modification of said charged state takes place across said collector and emitter; and
said base controls said amplification of current in synchronisation with the switching of the three terminal switch; and
wherein said means for amplifying the current further comprises a diode connected between the control terminal of the three terminal switch and the collector of the transistor.
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Accused Products
Abstract
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.
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Citations
10 Claims
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1. A circuit for improving switching performance of a three terminal switch comprising:
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said three terminal switch having a source for electrons, a drain for electrons, and a control terminal having an internal capacitance between the control terminal and the source for electrons; and
means for amplifying a current for modifying a charged state of said internal capacitance;
wherein said means for amplifying the current comprises a transistor having an emitter, collector, and base;
said modification of said charged state takes place across said collector and emitter; and
said base controls said amplification of current in synchronisation with the switching of the three terminal switch; and
wherein said means for amplifying the current further comprises a diode connected between the control terminal of the three terminal switch and the collector of the transistor.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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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:
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a voltage comparator, having a positive input, a negative input, and an output; and
a three terminal means for switching current with a source for electrons, a drain for electrons, and a control terminal controlled by a voltage from the output of said voltage comparator;
said three terminal switching means having an internal capacitance between the control terminal and the source for electrons associated therewith; and
wherein said voltage comparator includes current amplification means that negate effects on switching time of the switching means due to said internal capacitance. - View Dependent Claims (9, 10)
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Specification