Osram Gmbh

Osram Ag

Osram S.p.a. - Societa' Riunite Osram Edison Clerici

Daniele Luccato

Paolo De Anna

Enrico Raniero

Giancarlo Pellizzari

An electronic half-bridge converter includes an input comprising two terminals for receiving a first power signal, and an output comprising two terminals for providing a second power signal. The converter includes a transformer and a half-bridge, wherein the half-bridge is interposed between input and primary winding of transformer. On the secondary side of transformer, the converter includes a rectifier circuit configured for converting the current provided via secondary winding into a rectified current, and a filter circuit configured for providing said second power signal by means of a filtering of the rectified current provided by rectifier circuit. The filter circuit includes:

Electronic converter and related method of operating an electronic converter

An electronic converter comprising an input comprising two terminals for receiving a first power signal, and an output comprising two terminals for providing a second power signal. On the primary side, the converter comprises a half-bridge, a transformer and a first capacitor. Specifically, the first capacitor and the primary winding of the transformer are connected in series between the intermediate point of the half-bridge and an input terminal. On the secondary side, the converter comprises a diode, a second capacitor and an inductor. The second capacitor and the secondary winding of the transformer are connected in series between the cathode and anode of the diode, and the inductor and the output are connected in series between the cathode and the anode of the diode. The electronic converter comprises a third capacitor and at least one electronic switch adapted to selectively connect the third capacitor in parallel with the second capacitor.

An electronic converter, including a measurement circuit for determining a first signal indicative of the voltage or current supplied by the electronic converter, a regulation circuit for generating a regulation signal as a function of the first signal and one or more reference signals, and a driver circuit for driving the switching stage of the electronic converter as a function of the regulation signal. The electronic converter includes an optical, inductive or capacitive coupler and a transmission circuit configured to generate a pulse width modulated signal applied to the input of the optical, inductive or capacitive coupler, wherein the transmission circuit varies the duty cycle and the frequency of the pulse width modulated signal as a function of the first and second signal. The electronic converter includes a receiver circuit configured to monitor the received signal at the output of the optical, inductive or capacitive coupler.

Electronic converter and related lighting system

Herein is disclosed an electronic converter, including a measurement circuit for determining a first signal indicative of the voltage or current supplied by the electronic converter, a regulation circuit for generating a regulation signal as a function of the first signal and one or more reference signals, and a driver circuit for driving the switching stage of the electronic converter as a function of the regulation signal.

An asymmetric electronic half-bridge converter includes a positive input terminal and a negative input terminal for receiving a DC voltage, and two output terminals for providing a regulated output voltage or a regulated output current. The electronic converter moreover includes a half-bridge, a transformer and a rectification and filter circuit. The half-bridge includes a first and second electronic switch, connected in series between the two input terminals, wherein a respective capacitance and a respective diode are associated with the first and second electronic switch. A first terminal of the primary winding is connected to the intermediate point between the first and second electronic switch, and a second terminal of the primary winding is connected via a first capacitor to the positive or negative input terminal. The rectification and filter circuit is connected between the secondary winding and the output terminals.

An electronic converter may include transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to an input for receiving a power signal, and wherein the secondary winding is coupled to an output including a positive terminal and a negative terminal for providing a power signal. The converter moreover may include an electronic switch arranged between the input and the primary winding, wherein the electronic switch is configured to control the current flow through the primary winding. Specifically, the converter may include a snubber circuit arranged between the secondary winding and the output.

Electronic converter, and related lighting system and method of operating an electronic converter

An electronic half-bridge ZETA converter may include a transformer, wherein a half-bridge is connected to the primary winding of transformer, and wherein a respective capacitance and a respective diode are associated with the half-bridge switches. Moreover, the converter includes a ZETA converter which is connected to secondary winding of transformer, so that the ZETA converter includes a first inductance, which includes the magnetization inductance of transformer, and a second inductance. Finally, the converter includes a control unit which drives the half-bridge switches with four time intervals that are repeated periodically. Specifically, during the fourth time interval the first and the second switch are opened, so that the capacitance associated with said second switch is charged and the capacitance associated with said first switch is discharged, enabling a zero voltage switching.

Electronic resonant and insulated half-bridge zeta converter

An electrical supply device may include a transformer with a secondary winding to feed a current to a load; control circuitry for the device; an auxiliary supply source for said control circuitry. The auxiliary supply source may include an output capacitor across which a supply voltage is provided for said control circuitry; at least one charge accumulation capacitor to be traversed by the current fed to said load; a comparator sensitive to the voltage on said at least one charge accumulation capacitor; and a switch interposed between said at least one charge accumulation capacitor and said output capacitor, said switch coupled to said comparator, whereby when the voltage on said at least one charge accumulation capacitor reaches a reference level, said switch couples said at least one charge accumulation capacitor to said output capacitor by transferring onto said output capacitor the charge on said at least one charge accumulation capacitor.

Power supply device having an auxiliary supply source for control circuitry

In various embodiments, a two-switch flyback power supply may include a transformer having a primary winding and a secondary winding to feed a load; a pair of electronic switches alternatively switchable on and off to connect the primary winding of said transformer to an input line to feed said primary winding of said transformer, wherein at least one of said electronic switches is an electronic switch having a control electrode floating with respect to ground; a capacitive voltage divider arranged between said input line and the ground of the device, with the dividing point of said capacitive voltage divider connected to an intermediate point of said primary winding of said transformer; and an auxiliary secondary winding in said transformer, said auxiliary secondary winding feeding the control electrode of said at least one of said electronic switches.

Growing community of inventors

Vittorio Veneto, Italy

Daniele Luccato