Patent ID: 8587210
Filing Date: 2013-11-19
Classification: H05B

Abstract:
1. An electronic ballast for operating at least one discharge lamp, the electronic ballast comprising: an input having a first and a second input connection for coupling to a DC supply voltage, whereby the second input connection is connected to an external reference potential; a load circuit having an output having a first and a second output connection for connecting the at least one discharge lamp; a constant-current transformer which comprises 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; whereby a first capacitance is defined by the regions of the electronic ballast which are connected during operation to an HF voltage, by means of which a first voltage is defined which during operation drops with respect to the external reference potential across the first capacitance; and whereby a second capacitance is defined by the regions of the electronic ballast which during operation are supplied with a DC voltage HF-wise with respect to an internal reference potential; 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.