摘要:
This invention is a circuit to invert DC to AC for the operation of electroluminescent lamps. A primary winding of a transformer is in series with a power source and the input or output of the switching device. The output of the switching device is connected back to the power source. The secondary winding of the transformer is in series with an electroluminescent lamp and the controller side of the switching device. The secondary winding doubles as both the output to the electroluminescent lamp and the feedback winding to the controller side of the switching device. The electroluminescent lamp doubles both as the load and limiting impedance to the controller side of the switching device.
摘要:
An inverter circuit suitable for use as a fluorescent lamp inverter ballast is disclosed. The inverter has the capability of starting the fluorescent lamp through regenerative feed-back techniques made possible by the amplification characteristic of the inverter switching transistor. Good efficiency at high frequency is provided by minimizing the transistor switching losses through use of resonant storage techniques and an unique feed-back system. Further, the normal energy lost in the feed-back circuit is eliminated by combining the resonant load means and the feed-back means into a single structure.
摘要:
A method and apparatus of lighting a cold cathode electric gas discharge lamp in which the lamp is connected across the secondary winding of a voltage step-up transformer, and the primary winding of the transformer is energized with a chopped D.C. voltage having a frequency of at least 12 kHz and a voltage which provides an output voltage from the secondary winding having an R.M.S. value no greater than 700 volts.
摘要:
A family of circuits characterized by storage mode operation in a switching circuit employs minority carrier injection from the base into the collector region of a semi-conductor device. The minority carrier charge stored in the collector thereafter causes amplified forward collector emitter current when forward collector potential is applied. Particular examples of the circuit family includes inverters, single shot circuits transistor oscillators and electronic switching in general.
摘要:
An inverter for transforming a d.c. current to an a.c. current comprising, a switching transistor and an output transformer having a primary winding connected to the collector of the transistor, a current transformer having a primary winding connected to the primary winding of the output transformer and a secondary winding connected to the base of the switching transistor, a coupling capacitor inserted between said base of the transistor and the secondary winding of the current transformer, a capacitor parallelly connected to the primary winding of the output transformer, the primary windings of the output and current transformers and said capacitor forming a resonance circuit to control the oscillation.
摘要:
In a self-exciting type high voltage generating apparatus utilizing a piezolectric voltage transforming element driven by an oscillator, a capacitive feedback circuit is provided between the output of the piezolectric voltage transforming element and the oscillator to lock the oscillation frequency of the oscillator to the resonance frequency of the piezolectric voltage transforming element.
摘要:
A family of circuits characterized by storage mode operation in a switching circuit employs minority carrier injection from the base into the collector region of a semiconductor device. The minority carrier charge stored in the collector thereafter causes amplified forward collector-emitter current when forward collector potential is applied. Particular examples of the circuit family include inverters, single-shot circuits, transistor oscillators and electronic switching in general.