Abstract: A circuit arrangement having at least one electric main switch (T1) with a reference electrode (E), a control electrode (B), and a work electrode (C). A recovery diode (D1; D2) is connected antiparallel to the main flow direction of each main switch (T1). In order to speed up the switch-off process and in particular to reduce the attendant power loss, each main switch (T1) is assigned an electric auxiliary switch (T11; T22), whose work electrode is connected to the control electrode (B) of the associated main switch (T1) and whose reference electrode is connected to the reference electrode (E) of the associated main switch (T1). The capacitor (C11) is disposed between the control electrode of the auxiliary switch (T11; T22) and the work electrode (C) of the associated main switch (T1).

Abstract: The invention relates to a rectifier with midpoint feed, comprising a first and a second input terminal (A,B), which form an input of the rectifier, a first and a second output terminal (P,M), which form a first output of the rectifier, the first output terminal (P) forming the positive pole and the second output terminal (M) forming the negative pole of the first output of the rectifier, where a series circuit comprising a first and a second coupling capacitor (C1, C2) is arranged in parallel with the first output, the midpoint of the series circuit being connected to the second input terminal (B), a storage capacitor (C3) is arranged in parallel with a series circuit comprising a first and a second diode (D1, D2), the midpoint of the series circuit made up of the first and the second diode (D1, D2) being connected to the first input terminal (A), and the first diode (D1) being connected to the first coupling capacitor (C1) via a first inductor, and the second diode (D2) being connected to the second couplin

Abstract: The invention relates to a half-bridge inverter including a first and a second input terminal (E, N), which form an input of the inverter, a first and a second output terminal (B, A), which form an output of the inverter, a series circuit having a first and a second coupling capacitor (C1, C2), which series circuit is connected in parallel with the input and forms the passive bridge path, the midpoint of the series circuit made up of the first and the second coupling capacitor (C1, C2) being connected to the first output terminal (B), a series circuit having a first and a second switch (S1, S2), which series circuit forms the active bridge path and has its midpoint connected to the second output terminal (A), where a storage capacitor (C3) is arranged in parallel with the active bridge path, and the first coupling capacitor (C1) is connected to the storage capacitor (C3) via a first inductor (L1), and the second coupling capacitor (C2) is connected to the storage capacitor (C3) via a second inductor (L2).

Abstract: By adding a base bridging capacitor (C6, C6′) between the base connections of a bipolar transistor bridge oscillator, in particular of an electronic ballast for a low-pressure gas discharge lamp, the collector initial current peak is avoided, while ensuring that the switching transistors (T1, T2) are switched on, without any voltage, at the right time.

Abstract: The invention relates to a circuit arrangement for operating electrical lamps which encompasses an invertor (WR) with oscillation build-up circuit (trigger generator), comprising diac (DC1) and drive circuit. The drive circuit comprises a high-pass filter, in particular an RC high-pass filter (R1, C1). As a result, the trigger initiation is shifted closer to the zero crossing of the supply voltage. This means, in turn, that a more sinusoidal power supply current consumption with a smaller proportion of harmonics is obtained. In addition, more stable lamp operation is achieved in combination with power supply segment control dimmers.

Abstract: The invention relates to optimized-loss base drive for a bipolar transistor bridge oscillator circuit, by using base series capacitors and by not hng any non-reactive resistances in the base drive circuits.

Abstract: A circuit is proposed for the AC voltage operation of a discharge lamp by ans of a coupling capacitor (C3) with a safety disconnection device, connected in series with the lamp for DC current separation, which is characterized by the fact that the safety disconnection device responds to a DC voltage (UC3) at coupling capacitor (C3) by means of a DC current component flowing through the lamp.

Abstract: A circuit is proposed for the high-frequency operation of at least one lamp with an active harmonic filter with at least one capacitive pump branch with a pump capacitor (C1; C2) for feeding the energy back to a filter capacitor (C4) from a connection point on the lamp side between and including a central tap of the push-pull frequency generator and a first lamp diode, is characterized by the fact that a trapezoidal capacitor (CT1; CT2) is provided between a point of at least one pump branch, which, from the central tap of the push-pull frequency generator, lies out behind capacitor (C1; C2) of the pump branch, and one of the external taps, and thus the one or more pump capacitors of the one or more pump branches are the only capacitors connected in a direct capacitive load at the central tap of the push-pull frequency generator and/or no resonance capacitor (C6) connected directly in parallel to the lamp in the operating state is provided for lamp ignition.