Load driving apparatus with wide voltage input

A load driving apparatus, comprising:

• a direct current high voltage generation circuit, configured to selectively receive one of a first alternating current input voltage and a second alternating current input voltage different to each other, and processing the received alternating current input voltage to obtain and provide a direct current high voltage, wherein the direct current high voltage obtained by processing the first alternating current input voltage is substantially or approximately the same to the direct current high voltage obtained by processing the second alternating current input voltage;
• a switching circuit, coupled between the direct current high voltage and a ground potential, and configured to selectively output the direct current high voltage or the ground potential in response to two complementary pulse width modulation signals, so as to provide an alternating current signal;
• a transformer, having a primary side and a secondary side, wherein the primary side is coupled to the switching circuit to receive the alternating current signal, and the secondary side provides a driving signal to drive a light-emitting load in response to the alternating current signal received by the primary side;
• and
• a control circuit, operated under a system voltage and coupled to the switching circuit, and configured to generate the two complementary pulse width modulation signals to control switching of the switching circuit.