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Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Patent-treuhand-gesellschaft F. Elektrische Gluehlampen Mbh

Patent-treuhand-gesellschaft Fur Elektrisch Gluhlampen Mbh

Patent-treuhand-gesellschaft F&uuml;r Elektrische Gl&uuml;hlampen Mbh

Patent-treuhand-gesellschaft Fur Gluhlampen Mbh

Wolfram Sowa

Markus Heckmann

Felix Franck

Olaf Busse

Arwed Storm

Reinhard Lecheler

Oskar Schallmoser

Harald Dellian

Maximilian Gerber

Christoph Kreutner

An electronic ballast for operating at least one discharge lamp may include an input having a first and a second input connection for coupling to a DC supply voltage; a load circuit having an output; a constant-current transformer which includes a converter throttle, a converter diode and a converter switch, whereby the converter throttle is coupled serially between the first input connection and the load circuit; an activation circuit which is configured to activate the converter switch during operation with an HF signal; wherein at least one component across which a second voltage which is opposite in phase to the first voltage drops during operation is coupled between the internal and the external reference potential.

Electronic ballast for operating at least one discharge lamp

A circuit arrangement for conversion of an input AC voltage to a DC voltage is provided. The circuit arrangement may include an input into which the input AC voltage is input; an output to which a load can be connected; and a first storage circuit and a second storage circuit, each storage circuit comprising at least one inductance and each comprising at least one capacitance, and a diode network.

Circuit arrangement for conversion of an input AC voltage to a DC voltage, retrofit lamp having a circuit arrangement such as this, as well as a lighting system

The present invention relates to an electronic ballast for operating a lamp (L) which has a Class E converter (T, L). When a lamp (L) is connected, the output current of the Class E converter (T, L) once a switching element (T) of the Class E converter (T, L) has been switched off has a first and a second half-cycle of opposite polarity. The electronic ballast has a measurement apparatus for measuring the output current and a regulating apparatus for adjusting a switch-on time of the switching element. In this case, the measurement apparatus is designed to determine a first output current value of the first half-cycle and a second output current value of the second half-cycle, wherein the regulating apparatus for adjusting the switch-on time is fed a control variable based on the discrepancy between the two output current values.

Switch-off time regulation system for an inverter for driving a lamp

A converter circuit, in particular having a class E converter, comprising a drive circuit for a switching transistor MOS1 having two series-connected components which operate as a function of the threshold value, in particular comparators K1, K1' and K2, K2&#x2032;.

Control circuit for converters

The invention relates to a circuit arrangement for operating lamps. The circuit arrangement essentially comprises a full bridge. According to the invention, at least one inductor is connected in series with a full-bridge branch for switching load relief purposes. The circuit arrangement is preferably suitable for operation using a charge pump. PFC is thus achieved in a single-stage arrangement.

Circuit arrangement having a full bridge with switching load relief for operating lamps

The invention relates to a converter circuit having a series circuit of class E converter modules for optimizing the DC supply voltage of the individual converter module (for example C, C, Z, S, L, L).

Converter circuit having class E converter modules

The invention relates to a ballast for a lamp having an inverter which includes at least one switch (S ; S ), and having a drive circuit ( ) for alternately opening and closing the at least one switch (S ; S ) wherein the drive circuit ( ) is designed to drive the at least one switch (S ; S ) alternately at at least two different frequencies (&ohgr; , &ohgr; ). It also relates to a method for operating a ballast for a lamp having an inverter which comprises at least one switch (S ; S ), and having a drive circuit ( ) for alternately opening and closing the at least one switch (S ; S ) wherein the drive circuit drives the at least one switch (S ; S ) alternately at at least two different frequencies (&ohgr; , &ohgr; ).

Ballast and method for operating a lamp

The present invention relates to a device for preheating the two coil electrodes (W , W ) of a fluorescent lamp (La) comprising an AC voltage source ( ), a resonance capacitor C , which is arranged serially between the two coil electrodes (W , W ), a first inductance (L ), which is coupled between the AC voltage source ( ) and one of the two coil electrodes (W , W ), and a second inductance (L ), which is connected to a point between the AC voltage source ( ) and the coil electrode (W ) coupled thereto, the second inductance (L ) being coupled to the first inductance (L ) in such a way that a current flow (I ) through the second inductance (L ) leads to a reduction of the magnetization of the first inductance (L ). It furthermore relates to a corresponding method.

Device and method for preheating the coil electrodes of a fluorescent lamp

To provide for dimmer operation of a fluorescent lamp (L) with a minimum of circuit components, the d.c. output level at an output terminal (C1) of an energy supply source, such as a switched mode power supply (10, 10'), is controlled in accordance with the setting of a dimmer control (D). The voltage level at the output capacitor (C1) of the switched mode d.c. power supply furnishes supply voltage for an inverter (T1, T2) coupled to the discharge lamp. During lamp operation, a control unit (R) controls the level of the d.c. voltage supply for the inverter in accordance with the dimmer setting. This permits change of the brightness of the fluorescent lamp (L) in a range of from 5% to 100% of nominal value. Preferably, control of the supply voltage for the inverter is activated only upon occurrence of the ignition or arc-over phase, for example under control of a timing circuit (ZS), controlling a relay in the preheating circuit of the lamp. The system has the advantage that the lamp does not fire or ignite at full power level but only at the power level controlled by the dimmer (D).

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Munich, Germany

Wolfram Sowa