Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
219 words
A circuit for driving the base of a transistor by supplying a signal from a control circuit to the base in an insulating manner comprising: a first pulse transformer having a primary winding and a secondary winding, the first transformer being responsive to a pulse string signal corresponding to an ON signal from the control circuit applied to its primary winding for alternatingly being energized and de-energized; first circuit means coupled to the secondary winding for rapidly supplying a base drive current to the transistor while the first pulse transformer is energized; second circuit means, including capacitor means and means for charging the capacitor means while the first pulse transformer is energized, coupled to first circuit means and supplying base current drive to the transistor when the capacitor means is charged and the first pulse transformer is de-energized; and third circuit means including a second pulse transformer having a primary winding and a secondary winding, the second transformer being responsive to a pulse signal corresponding to an OFF signal from the control circuit applied to its primary winding for being energized, the secondary winding of the second transformer being coupled to the second circuit through one or more diodes for discharging the capacitor means and terminating the base current drive to the transistor when the second transformer is energized.
Claim 2
Dependent Claim
219 words
A circuit for driving the base of a transistor by supplying a signal from a control circuit to the base in an insulating manner comprising: a first pulse transformer having a primary winding and a secondary winding, the first transformer being responsive to a pulse string signal corresponding to an ON signal from the control circuit applied to its primary winding for alternatingly being energized and de-energized; first circuit means coupled to the secondary winding for rapidly supplying a base drive current to the transistor while the first pulse transformer is energized; second circuit means, including capacitor means and means for charging the capacitor means while the first pulse transformer is energized, coupled to first circuit means and supplying base current drive to the transistor when the capacitor means is charged and the first pulse transformer is de-energized; and third circuit means including a second pulse transformer having a primary winding and a secondary winding, the second transformer being responsive to a pulse signal corresponding to an OFF signal from the control circuit applied to its primary winding for being energized, the secondary winding of the second transformer being coupled to the second circuit through one or more diodes for discharging the capacitor means and terminating the base current drive to the transistor when the second transformer is energized.
Claim 3
Dependent Claim
64 words
The circuit for driving the base of the transistor according to claim 1, wherein the first circuit means includes first and second serially connected diodes coupled between one end of the secondary winding of the first pulse transformer and a base resistor of the transistor, the other end of the secondary winding of the first transformer being connected to an emitter of the transistor.
Claim 4
Dependent Claim
70 words
The circuit for driving the base of a transistor according to claim 2, wherein the second circuit means includes a first resistor coupled between the juncture of the first and second serially connected diodes and a condenser terminal, a third diode coupled between the condenser terminal and the base resistor, and a capacitor coupled between the condenser terminal and the other end of the secondary winding of the first transformer.
Claim 5
Dependent Claim
100 words
The circuit for driving the base of a transistor according to claim 2, wherein the circuit further includes a reset energy supply winding having a first and a second end, the first end of the reset energy supply winding being connected to the other end of the secondary winding of the first pulse transformer, the second end of the reset energy supply winding being coupled through another diode to the juncture of the first and second serially connected diodes of the first circuit means for supplying a base drive current to the transistor when the first pulse transformer is reset.
Claim 6
Dependent Claim
78 words
The circuit for driving the base of a transistor according to claim 2, wherein the second circuit means includes a further diode coupled between the one end of the secondary winding of the first transformer and a first node, a first resistor coupled between the first node and a condenser terminal and the base resistor and wherein the capacitor means is coupled between the condenser terminal and the other end of the secondary windings of the first transformer.