Patent ID: 8710761
Filing Date: 2014-04-29
Classification: H01L,H05B

Abstract:
1. A circuit arrangement for a piezo transformer, comprising: a driver circuit adapted to be coupled to the piezo transformer, the driver circuit comprising: a current sensor that is configured to generate an incoming current signal as a function of an incoming current flowing through the piezo transformer; a control unit configured to generate a control signal in such a way that the incoming current signal is smaller than or equal to a predetermined current value; and an oscillator with an oscillator output to emit an oscillator signal at a driver signal input of the driver circuit as a function of the control signal, wherein the current sensor comprises a measurement resistor, wherein the driver circuit comprises a first measurement transistor, wherein the driver control of the driver circuit, on the output side, is further coupled to a control connection of the first measurement transistor, wherein the driver circuit comprises a series circuit including the measurement resistor and the first measurement transistor, wherein the series circuit is arranged between the first primary connection and the reference potential connection, and wherein the incoming current signal can be tapped at a node between the measurement resistor and the first measurement transistor.