Electronic transformer
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorsUgo Francescutti, Felix Franck
Life of this patent
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Abstract
The present invention relates to electronic converters having an input circuit and an output circuit which, in addition to their converter function, carry out power-factor correction. They comprise a control circuit which opens and closes an electronic switch, to be precise as a function of the output voltage from the converter circuit and the voltage which is dropped across a current measurement sensor. The invention is distinguished in that the circuit has a logic ground LM and a power ground PM at different electrical potentials.
Claims15
An electronic converter having an input circuit and an output circuit which are connected to one another via an inductive coupling (L2, L3), with the output circuit having:
- a first and a second output terminal, between which an output voltage (UA) can be produced;
- the input circuit having:
- a first and a second input terminal for connection of a voltage source (UE) which has at least one DC voltage component;
- a series circuit which is arranged in series between the first input terminal and a first connection of the inductive coupling and comprises an inductance (L1) and a capacitor (C1) with the junction point (VP1) between the inductance and the capacitor being connected via an electronic switch (S1) to the second input terminal, and the inductance (L1) being arranged between the junction point (VP1) and the first input terminal, and the capacitor (C1) being arranged between the junction point (VP1) and the inductive coupling (L2, L3) ;
- a sensor resistor (RS) which is arranged between the second input terminal and the second connection of the inductive coupling (L2, L3) ;
- a control circuit (ST), to which at least the output voltage and the voltage (US) dropped across the sensor resistor (RS) can be supplied as input signals, with the control circuit (ST) opening and closing the switch (S1) as a function of the input signal supplied to it;
- characterized in that the junction point (VP2) between the sensor resistor (RS) and the second connection of the inductive coupling (L2, L3) is connected to a logic ground (LM), and the second input terminal is connected to a power ground (PM), with the power ground and logic ground being at different electrical potentials.
An electronic converter having an input circuit and an output circuit which are connected to one another via an inductive coupling with the output circuit having:
- a first and a second output terminal, between which an output voltage (UA) can be produced;
- the input circuit having:
- a first and a second input terminal for connection of a voltage source (UE) which has at least one DC voltage component;
- a series circuit, which is arranged in series between the second input terminal and a first connection of a sensor resistor (RS) and comprises an inductance (L1) and a capacitor (C2), with the junction point between the inductance (L1) and the capacitor (C2) being connected via a diode (D2) to the second connection of the inductive coupling (L2, L3), the second connection of the sensor resistor (RS) being connected to the first connection of the inductive coupling (L2, L3), and the inductance (L1) being arranged between the junction point and the second input terminal and the capacitor (C2) being arranged between the junction point and the first connection of the sensor resistor (RS);
- an electronic switch (S1) which is arranged between the first input terminal and the first connection of the sensor resistor (RS);
- a storage capacitor (C3) which is arranged between the first input terminal and the second connection of the inductive coupling (L2, L3) ;
- a control circuit (ST), to which at least the output voltage and the voltage (US) dropped across the sensor resistor (RS) can be supplied as input signals, with the control circuit (ST) opening and closing the switch (S1) as a function of the input signals supplied to it;
- characterized in that the junction point between the sensor resistor (RS) and the first connection of the inductive coupling (L2, L3) is connected to a logic ground (LM), and the first input terminal is connected to a power ground (PM), with the power ground and logic ground being at different electrical potentials.
The electronic converter as claimed in one of the preceding claims, characterized in that a diode, in particular a Schottky diode, is arranged in parallel with the sensor resistor (RS).
Dependencies are inferred from the claim text.