Driver circuit for inductive loads

Circuit, based on use of power transistors which do not display second breakdown under valve loading, drives inductive loads. Peak voltages, power dissipations, heat sink requirements, and thermal stability considerations can be obtained by theoretical analysis

Active lamp pulse driver circuit

A flashlamp drive circuit is described which uses an unsaturated transistor as a current mode switch to periodically subject a partially ionized gaseous laser excitation flashlamp to a stable, rectangular pulse of current from an incomplete discharge of an energy storage capacitor. A monostable multivibrator sets the pulse interval, initiating the pulse in response to a flash command by providing a reference voltage to a non-inverting terminal of a base drive amplifier; a tap on an emitter resistor provides a feedback signal sensitive to the current amplitude to an inverting terminal of amplifier, thereby controlling the pulse amplitude. The circuit drives the flashlamp to provide a squarewave current flashlamp discharge

Driver circuit

A driver circuit which has low power requirements, a relatively small number of components and provides flexibility in output voltage setting. The driver circuit comprises, essentially, two portions which are selectively activated by the application of input signals. The output signal is determined by which of the two circuit portions is activated. While each of the two circuit portions operates in a manner similar to silicon controlled rectifiers (SCR), the circuit portions are on only when an input signal is supplied thereto

Flipflop interrogator and bi-polar current driver Patent

Interrogator and current driver circuit for combination with transistor flip-flop circui

Low-power, 10-Gbps 1.5-Vpp differential CMOS driver for a silicon electro-optic ring modulator

We present a novel driver circuit enabling electro-optic modulation with high extinction ratio from a co-designed silicon ring modulator. The driver circuit provides an asymmetric differential output at 10Gbps with a voltage swing up to 1.5V(pp) from a single 1.0V supply, maximizing the resonance-wavelength shift of depletion-type ring modulators while avoiding carrier injection. A test chip containing 4 reconfigurable driver circuits was fabricated in 40nm CMOS technology. The measured energy consumption for driving a 100fF capacitive load at 10Gbps was as low as 125fJ/bit and 220fJ/bit at 1V(pp) and 1.5V(pp) respectively. After flip-chip integration with ring modulators on a silicon-photonics chip, the power consumption was measured to be 210fJ/bit and 350fJ/bit respectively

Optimal Modulation Current for Gain-Switching Lasers

This paper formally shows that an exponentially rising current is optimal in terms of resistive ohmic loss for driving a semiconductor laser into the gain-switching mode. A metric to quantify the quality of laser operation that measures the similarity of a generated optical pulse to the delta function is proposed. Several circuit implementations to approximate exponentially rising current are developed, including using a driver circuit with BJT output stage, a network of RLC circuits, and a saturating inductor. An experimental comparison between a state-of-the-art sinewave resonant driver circuit and a directly driven laser is performed that favors the latest variant of the driver

BLDC motor driver circuit

U ovom završnom radu je objašnjena teorija o BLDC motoru i uspoređen je s istosmjernim motorom kojeg sve više zamjenjuje. Zatim je obrađena teorija sklopovlja upravljača za BLDC motor; način na koji takav sklop radi s BLDC motorom i teorije upravljanja takvim sklopom. Tada je prikazan jedan primjer izrade takvog sklopa i testiranje istog sa kratkim objašnjenjem rezultata testiranja.In this final thesis the theory of BLDC motors is described and it is compared with DC motors which it replaces. Then the theory of hardware for BLDC motor has been studied; the way it works with BLDC motors and theory of controling that circuit. Then one example of such circuit is displayed and tested with short review of the results