Abstract: The invention relates to a device (1) for irradiating tissue (G) with light pulses (L), comprising a housing (2), at least one light source (3) for emitting the light pulses (L) with a wavelength (?) of from 600 nm to 660 run, a modulator (4) and a power stage (6) for generating the light pulses (L), and with an activating element (5). For creating a device (1) which is as small, as cost-efficient and as effective as possible, by which as good a therapy success as possible is achieved in various applications, the modulator (4) is designed for generating the light pulses (L) with a pulse frequency (f) of from 1 to 10 Hz, and the power stage (6) is designed for emitting the light pulses (L) with an energy which causes breaking up of the photosensitizer in the photodynamic therapy and evokes a frequency doubling or a two-photon absorption (TPA) in the tissue (G) when treating inflammations without a sensitizer.

Abstract: The invention relates to a device (1) for irradiating tissue (G) with light pulses (L), comprising a housing (2), at least one light source (3) for emitting the light pulses (L) with a wavelength (?) of from 600 nm to 660 run, a modulator (4) and a power stage (6) for generating the light pulses (L), and with an activating element (5). For creating a device (1) which is as small, as cost-efficient and as effective as possible, by which as good a therapy success as possible is achieved in various applications, the modulator (4) is designed for generating the light pulses (L) with a pulse frequency (f) of from 1 to 10 Hz, and the power stage (6) is designed for emitting the light pulses (L) with an energy which causes breaking up of the photosensitizer in the photodynamic therapy and evokes a frequency doubling or a two-photon absorption (TPA) in the tissue (G) when treating inflammations without a sensitizer.

Abstract: An electric control circuit for the supply of ohmic-inductive loads via direct-current pulses with changeable pulse use-ration encompasses a regulator featuring a transformer (T) wherein the transformer is designed as an autotransformer with a single continuous winding with center tap and taps symmetrical to the center tap, is connected on the primary side via electronic switches (Q.sub.3, Q.sub.4) bridged by freewheeling diodes in push-pull arrangement to a direct-voltage source (B) and, on the secondary side, is connected via electronic switches (Q.sub.5, Q.sub.6) which are symmetrical to the transformer (T) and are bridged by freewheeling diodes. Between the connection point of the connections facing away from the transformer (T) of the electronic switches (Q.sub.5, Q.sub.6) on the secondary side, and the pole of the direct-voltage source (B) which pole faces away from transformer (T), there is connected at least one series circuit of two electronic switches (Q.sub.1, Q.sub.