An electrical power controller includes a boost converter, an invertor and an output section. The boost converter includes a control circuit which charges a capacitance from an inductance in accordance with a stream of pulses having a variable duty cycle. A feedback circuit responsive to the power consumed by a load provides an error signal for varying the duty cycle of the pulses. In the invertor, a pair of switches sample the charge on the capacitor to create an AC signal which is introduced to the output section. The sampling frequency in the boost converter is related to the sampling frequency in the invertor by an integer.

Electronic power controller

An ignition coil for the internal combustion engine has a cylinder portion and a head portion. A pillar portion that forms a part of a ventilation passage that communicates inside and outside of a plug hole via a sealing member, and a cover portion that covers the pillar portion without blockading an upper opening of a ventilation opening of the pillar portion are formed on a side of the head portion.

Ignition coil for internal combustion engine

A microwave inductor including a coil with windings tapered from a first end of the coil to a second end of the coil to reduce resonant loss glitches found in conventional inductors which have uniform diameter windings. The coil further includes a core composed of a dielectric material containing a colloidal suspension of magnetic particles, the magnetic material preferably being iron powder and the dielectric preferably being epoxy, making the core a poly-iron material. The magnetic particles being colloidally suspended in dielectric increase the impedance of the coil at high frequencies to reduce resonant glitches without lowering the low frequency Q of the inductor. As such, a single coil can be utilized both in a filter which requires a low impedance at low frequencies to create a high Q, and as a bias line which operates at frequencies well beyond the resonant frequency of the inductor since a high impedance is provided by the core at higher resonant frequencies. The percentage of magnetic particles relative to the dielectric material in the core can be controlled to set the inductance value for the microwave inductor.

Lumped element microwave inductor with windings around tapered poly-iron core

An internal combustion engine includes a cylinder head having a plug insertion hole, an ignition plug inserted in the plug insertion hole and having an input terminal covered with a plug cap An ignition system includes an ignition coil assembly having a primary coil, a secondary coil, and a core extending through the primary and secondary coils, the ignition coil assembly being disposed in the plug cap The ignition system also includes magnets mounted on respective ends of the core, the magnets being oriented so as to produce magnetic fluxes in a direction opposite to magnetic fluxes generated by the primary coil The ignition system also has a shield member of a magnetic material surrounding the ignition coil assembly, and an insulating member of an electrically nonconductive material interposed between the shield member and an inner wall surface of the plug insertion hole The shield member is of a substantially cylindrical shape having an electrically nonconductive insulating region in a circumferential portion thereof

Ignition system for internal combustion engine

Apparatus for supplying high voltage to each spark plug of a multi-cylinder internal combustion engine via a spark coil includes a distributor plate of a unitary construction made of an electrically-insulative resin and having an integral base portion and an integral connector. A plurality of connecting lines are embedded in the base portion. One ends of the connecting lines are electrically connected respectively to spark coils whereas the other ends thereof extend to the connector. The distributor plate and the spark coils can be fixed, as a unit, to the internal combustion engine by a bracket of metal.

Apparatus for supplying high voltage to spark plug of internal combustion engine

In a transformer including a low-voltage input coil, a high-voltage output coil disposed coaxially of the low-voltage input coil, and a core for magnetically connecting both of the coils together; the improvement comprising a first bobbin around which the low-voltage input coil is wound which first bobbin has an inner-diameter hole, wherein the core comprises a rod portion to be inserted into the inner-diameter hole of the first bobbin and a flange portion provided at one axial end of the rod portion. In another aspect of the invention, the transformer further comprises a second bobbin around which the high-voltage output coil is wound, and a connector adapted to be connected to an ignition plug which connector is mounted on an end surface of the second bobbin on the opposite side of the flange portion of the core in such a manner that a mounting direction of the connector substantially coincides with an axial direction of the second bobbin. In a further aspect of the invention, the transformer further comprises a shield case formed of a magnetic conductive material surrounding an outer periphery of the connector or entirely surrounding the transformer. The rod portion of the core may have a tapering cross section such that it is gradually tapered from a low voltage side of the high-voltage output coil to a high voltage side thereof. With this arrangement, the transformer may be easily assembled and made compact. Further, a magnetic efficiency may be improved, and an insulating distance between the low-voltage input coil and the high-voltage output coil may be ensured.

Transformer with tapered core

A high voltage generating circuit which includes a switching circuit for switching a DC input, a fly-back transformer whose input coil is driven by pulses delivered from the switching actuation of the switching actuation of the circuit, a rectifier circuit for rectifying the fly-back voltage generated in the output coil of the fly-back transformer, a capacitor for smoothing the rectified output, and a voltage stabilizing circuit. A diode is electrically connected to one terminal of the output coil of the fly-back transformer on the low-voltage side thereof as compared with the ground, the diode being so determined as to position in the forward direction to the direction of rectification. The voltage stabilizing circuit is formed by a voltage sensing circuit for sensing a DC high voltage output, comparing it with a reference voltage applied from a reference voltage source and generating an output of a result of comparison and a control circuit connected between the anode of the diode and the ground terminal. The control circuit is formed of a plurality of transistors including transistors controlled in response to the output from the voltage sensing circuit and a protective circuit for each of the transistors.

High voltage supply having a voltage stabilizer

A discharge load driving circuit has a transformer with a low voltage coil and a high voltage coil wound around a magnetic core. The high voltage coil has a transformation ratio for setting a high self-resonance frequency value for the transformer to thereby output high voltage at a short rise time period. The discharge load driving circuit further includes a switching element connected to the transformer for switching on and off a d-c input supplied thereto through the low voltage coil of the transformer. The discharge load driving circuit further includes a driver circuit for driving a switching element driving pulse, a control circuit for controlling the driver circuit, a discharge load connected to the high voltage coil for discharging load by a high voltage output generated in the high voltage coil when the switching element is turned on, and a detector for detecting a flow of discharge current in the discharge load. The switching element repeats its on-off action in a predetermined. For supplying a required amount of discharge energy to the discharged load until self-propagation of a flame subsequent to generation of a flame nucleus by a spark discharge of the discharge load.

Regulated forward converter for generating repeating spark discharge pulses

There is provided an improved circuit for driving a discharge load such as a spark plug, a discharge elec­trode of a combustor or the like. It is formed into a forward type circuit configuration which feeds to the discharge load a high voltage output generated in a high voltage coil of a transformer in accordance with turn-on of a switching element actuated to switch on and off a d-c input supplied thereto through a low voltage coil of the transformer. Consequently, exact ignition can be effected in the discharge load without failure under the condition that the rise time is shortened and still the duration of high voltage application is set to be suffi­ciently long equivalently.

Kiyoshi Matsui

Papers

Transformer with tapered core

High voltage supply having a voltage stabilizer

Regulated forward converter for generating repeating spark discharge pulses

Discharge load driving circuit

Schaltung zur erzeugung einer hochspannung