Transistor control apparatus
阅读：307发布：2023-05-10
专利汇可以提供Transistor control apparatus专利检索，专利查询，专利分析的服务。并且There is disclosed a system utilizing transistor control apparatus for supplying operating potentials which is particularly useful with load device wherein at least two transversely oriented conductors are dielectrically isolated from a gaseous discharge medium between the conductors. The invention is illustrated in wave form generators, each having at least one output transistor. Novel transformer-diode clamping means are provided which may automatically sense saturation of an output transistor and reverse bias the collector-base junctions of the output transistors, to bring deeply saturated transistors out of saturation and enable them to turn off much more rapidly than was possible heretofore, and to sense the driving current for the primary winding of the transformer to keep the output transistor biased near saturation. The system shown thus produces a more effective wave form having steeper leading and trailing edges, the wave form in the embodiment shown being used as a sustaining voltage for cells in a gas discharge display/memory panel.，下面是Transistor control apparatus专利的具体信息内容。
1. In a system for supplying operating potential to a load device wherein at least two transversely oriented conductors are dielectrically isolated from a gas discharge medium between said conductors, comprising a. voltage wave form generating means having an output means adapted to be connected to a transverse conductor; b. said wave form generating means including at least two sections, a first of said sections being operative to connect a first potential level to said output means while a second of said sections is operative to connect a second potential level to said output means; c. each of said output sections including at least one Output transistor means operating as a switching means between its respective potential level and said output means of said wave form generating means, each said transistor means having collector, base and emitter electrodes and collector-base junction; d. means for selectively applying turn-on signals to the base electrodes of said output transistor means, said signals being sufficient in magnitude to drive each of said output transistor means into saturation; e. means for selectively establishing current flow through said collector-base junction of each of said output transistor means to reverse bias said collector-base junction to enable each of said output transistors to turn off quickly; f. at least one of said reverse bias establishing means including a transformer having primary and secondary windings, isolating rectifier means, and means for connecting one side of a reverse bias source to said primary winding; g. means for connecting said secondary winding between the base electrode of said output transistor and the other side of said reverse bias source; and h. means for sensing the voltage across said primary winding to supply biasing current to the base electrode of said output transistor.
2. A system as defined in claim 1 in which said means for connecting a reverse bias source to said primary includes switching means, interposed between the reverse bias source and the primary, which is responsive to turn-off signal to connect said reverse bias source to said primary winding.
3. A system as defined in claim 2 in which said switching means includes a. second transistor means responsive to turn-off signal to supply driving current to said primary means, and b. feedback means responsive to the driving current required by said primary for regulating the output of said second transistor means.
4. A system as defined in claim 3 in which said means for sensing said primary winding voltage and supplying current to the base electrode of said first-mentioned transistor means is also responsive to said feedback means, thereby enabling said feedback means to control the driving of said first-mentioned transistor means to maintain the first-mentioned transistor means near saturation as current flow through the collector-emitter circuit thereof varies.
5. A system as defined in claim 1 in which a. a first switching means is interposed between a turn-on source and said base electrode and is responsive to a turn-on signal to connect said turn-on source to said base electrode, and b. a second switching means is interposed between said reverse bias source and said primary winding and is responsive to a turn-off signal to connect said reverse bias source to said primary winding.
6. Control apparatus, comprising a. transistor means having collector, base, and emitter electrodes with collector-base and base-emitter junctions between said electrodes; b. means for connecting a turn-on source to provide a driving signal to said base electrode having a magnitude sufficient to turn said transistor on and drive said transistor into a saturated condition; and c. means for selectively establishing current flow through said collector-base junction to reverse bias said junction to enable said transistor to turn off quickly; d. said reverse bias establishing means including a transformer having primary and secondary windings, an isolating rectifier means, and means for connecting one side of a reverse bias source to said primary winding; e. said primary winding being connected between said collector and base electrodes of said one output transistor means via said isolating rectifier means, which is connected to prevent current flow in said secondary winding from said collector electrode to said base electrode, so that current flow in said primary winding will induce a voltage on said secondary winding which will reverse bias said collector-base junction; f. said secondary winding being connected between saId base electrode and the other side of said reverse bias source means; g. and means for connecting the voltage developed across said primary winding to provide a bias current to the base electrode of said transistor means.
7. Apparatus as defined in claim 6 in which said reverse bias source for said primary winding is derived from said driving current for said transistor means.
8. Apparatus as defined in claim 6 in which said means for connecting a reverse bias source to said primary winding includes second and third transistors, said second transistor being responsive to a turn-off signal to enable said third transistor to connect a reverse bias source to supply driving current to said primary winding.
9. Apparatus as defined in claim 8 which further includes feedback means responsive to the driving current supplied to said primary winding for regulating the output of said second transistor means.
10. Apparatus as defined in claim 9 in which the end of said primary winding receiving driving current from said reverse bias source is also connected to said base electrode of said first-mentioned transistor means by said bias current connecting means, thereby enabling said feedback means to maintain said first-mentioned transistor means near saturation as the current flow through the collector-emitter circuit varies and thus also varies the current flow through said secondary winding connected to the collector electrode of said first-mentioned transistor means.
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