Patent ID: 8638158

Claim:
A signal transmitting apparatus having a sending coil and receiving coil, comprising: an upper first switching element provided between a first terminal of the sending coil and a power supply terminal of a high reference voltage; a lower first switching element provided between the first terminal and a power supply terminal of a low reference voltage; an upper second switching element provided between a second terminal of the sending coil and the power supply terminal of the high reference voltage; a lower second switching element provided between the second terminal and the power supply terminal of the low reference voltage; and a switching element controlling module that controls the upper first switching element, the lower first switching element, the upper second switching element and the lower second switching element, wherein the sending coil and the receiving coil are insulated electrically, the signal is transmitted from the sending coil to the receiving coil, the switching element controlling module performs a first control and a second control, the first control generates a coil current flowing through the sending coil in a first direction by turning on the upper first switching element and the lower second switching element and turning off the upper second switching element and the lower first switching element, and then turns on the lower first switching element in response to turning off the upper first switching element, and the second control generates a coil current flowing through the sending coil in a second direction by turning off the upper first switching element and the lower second switching element and turning on the upper second switching element and the lower first switching element, and then turns on the lower second switching element in response to turning off the upper second switching element.