Patent ID: 8149563

Claim:
An ignition circuit, comprising: an ignition coil comprising a first terminal connected to a positive terminal of a system power supply, and a second terminal; a delay unit; a first switch unit comprising a first terminal connected to the positive terminal of the system power supply, a second terminal connected to ground, and a control terminal connected to the positive terminal of the system power supply via the delay unit; and a second switch unit connected in series with the ignition coil, wherein the second switch unit comprises a first terminal connected to the second terminal of the ignition coil, a second terminal connected to ground, and a control terminal connected to the first terminal of the first switch unit; wherein the second switch unit is turned on in response to the system power supply being powered on, thereby the ignition coil is powered on, then the delay unit controls the first switch unit to be turned on after a delay time, the second switch unit is thus turned off, thereby the ignition coil is powered off.