Patent ID: 8970120
Filing Date: 2015-03-03
Classification: H05B,Y10S

Abstract:
1. A lamp driving apparatus, comprising: a power switching circuit coupled between a DC input high-voltage and a ground potential, and configured to switch and output the DC input high-voltage and the ground potential in response to two output signals with a phase difference of 180 degrees, so as to generate a square signal; an LC resonator coupled to an output of the power switching circuit and configured to receive and convert the square signal, so as to generate a sinusoidal driving signal for driving a lamp; a control chip coupled to an input of the power switching circuit and operated under a DC operating voltage, and the control chip being configured to provide the output signals to control operation of the power switching circuit; and an open lamp and over-voltage detection circuit coupled to the control chip and connected across two terminals of the lamp, and the open lamp and over-voltage detection circuit being configured to: detect whether the lamp is opened or over-voltage; and send, when any one of the two terminals of the lamp is opened or the lamp is over-voltage, an abnormal signal indicating that any one of the two terminals of the lamp is opened or the lamp is over-voltage, to the control chip, wherein the control chip further stops providing the output signals in response to the abnormal signal, wherein the open lamp and over-voltage detection circuit is further configured to send, when the lamp is normal, a non signal indicating that the lamp is normal, to the control chip, so as to make the control chip to normally provide the output signals to control the operation of the power switching circuit, wherein the open lamp and over-voltage detection circuit comprises: