Abstract:
In an ignition device (3), in particular for an externally ignited internal combustion engine, the passage of current through the primary winding (1a) of an ignition transformer (1) is controlled by a current control device consisting of a preliminary stage (3a) and a final stage (3c). The final stage (3c) of the current control device comprises a pnp transistor (T100), the collector terminal of which is connected directly to the earth terminal of the ignition device in order to improve the output of the loss line. Decoupling means (3b) which protect the preliminary stage (3a) from the holding voltage are arranged between the preliminary stage (3a) and the final stage (3c).
Abstract:
Proposed is a circuit designed to measure on the spark plug the spark voltage transformed in the primary winding of the ignition coil in the ignition system of an internal-combustion engine. The circuit includes a voltage transformer (8) whose controlled system is triggered by the spark voltage transformed in the primary winding (2) of the ignition coil in such a way that a current is generated which can be fed to a sensor element and is proportional to the spark voltage.
Abstract:
A short-circuit resistant transistor final stage, in particular an ignition final stage for motor vehicles, has a power transistor (10) connected in series to a consumer (12) and a blocking device that disconnects the power transistor (10) when a short-circuit occurs at the consumer. Means (23') for detecting a voltage drop at the consumer are connected to the consumer (12). A switch transistor (27) controllable through these means and linked to the base of the power transistor (10) applies to the base of the power transistor a potential that blocks the switching section of the power transistor below a predeterminable, very low voltage drop at the consumer that defines the occurrence of a short-circuit. The power transistor (10) is thus reliably disconnected in the event of a short-circuit and reliably remains in the disconnected state.
Abstract:
An electronic system allowing the interruption of high continuous intensities flowing through high self-inductions, without destructive effects at the contact levels by deviation and eventual utilisation of breakage extra-currents, with an application to electronic ignition of motors, in realisations employing a minimum of electric and electronic components.
Abstract:
A circuit arrangement for an ignition stage, in particular for the ignition circuit of a motor vehicle, has a multiple Darlington transistor (Darlington) which drives a primary winding of an ignition coil, and a driving circuit for the Darlington. An npn-Darlington (T5) is provided whose collector is connected to the positive pole (14) of a voltage source and whose emitter is connected to a first connection of the primary winding (16) of the ignition coil (18), whereas the second connection of the primary winding (16) is earthed. The Darlington (T5) is driven by means of a decoupling stage which decouples the driving circuit from a negative blocking voltage applied to the Darlington base when the Darlington (T5) is switched off.
Abstract:
The description relates to a final ignition stage (1), especially for internal combustion engines, in which the final stage consists of two or three-stage Darlington circuits (T1, T2) and, for overvoltage protection, has either an internal single-stage or an external multi-stage clamp via a Zener diode (Z1), where a short-circuit transistor (T3) is fitted on the drive terminal (B) of the Darlington circuit in parallel to the base-emitter line of the ignition Darlington circuit (T1, T2) for protection against parasitic currents.
Abstract:
The invention relates to a controllable, temperature-compensated voltage limiter with a pnp or npn semiconductor structure in which the width and doping of the central region are such that, when a voltage is applied to the two outer layers, no avalanche or Zener effect occurs (punch-through diode). According to the invention, the voltage UB to be limited is applied between the blocking pn junction (B-C). In addition, an adjustable auxiliary voltage (UH) is applied between the other pn junction (H-C). It is possible by means of the auxiliary voltage UH to set the punch-through at a higher value, so that this value is largely temperature-independent.
Abstract:
An ignition system (10) for an engine, the ignition system comprising a first circuit (12) comprising an energy storage device (24), a second circuit (14) for delivering energy to an electrostatic discharger (16), the second circuit (14) operably coupled to the first circuit (12) to receive energy therefrom, and a controller (30) operable to transition the system (10) between a first state and a second state by switching one or more components of a third circuit (34) out of or in to the first circuit (12), wherein on an ignition action when the system (10) is in the first state, an amount of energy is transferred from the first circuit (12) to the second circuit (14) and delivered to the electrostatic discharger (16) so as to produce an electrostatic discharge therefrom sufficient to ignite a combustible mixture in a corresponding combustion chamber, and on an ignition action when the system (10) is in the second state, energy of the first circuit (12) is decreased so that no energy is transferred from the first circuit (12) to the second circuit (14) or any energy that is transferred from the first circuit (12) to the second circuit (14) and delivered to the electrostatic discharger (16) is such that any electrostatic discharge produced therefrom is insufficient to ignite the combustible mixture in the combustion chamber.