Ignition device

Patent metadata

Field	Value
Publication number	US-2016201637-A1
Application number	US-201514971138-A
Country	US
Kind code	A1
Filing date	Dec 16, 2015
Priority date	Jan 8, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

An ignition coil includes a first winding, a second winding, and a third winding. A first switch is electronically connected to a first end of the first winding. A battery is electronically connected to a second end of the first winding. A booster with a first end electronically connected to the battery and a second end electronically connected to a first end of the third winding. A second switch is electronically connected to a second end of the third winding. A drive device is electrically connected to the first and the second switches, that turns the first and the second switch on and off. The drive device feeds a secondary current to the second winding by changing the first switch from an on-state to an off-state, and supplies an output from the booster to the third winding by changing the second switch from an off-state to an on-state.

First claim

What is claimed is:

1 . An ignition device comprising:
an ignition coil including a first winding, a second winding, and a third winding electromagnetically coupled to one another; a first switch electronically connected to a first end of the first winding; a battery electronically connected to a second end of the first winding; a booster with a first end electronically connected to the battery and a second end electronically connected to a first end of the third winding; a second switch electronically connected to a second end of the third winding; and a drive device electrically connected to the first and the second switches, that turns the first and the second switch on and off, wherein the drive device feeds a secondary current to the second winding by changing the first switch from an on-state to an off-state, and supplies an output from the booster to the third winding by changing the second switch from an off-state to an on-state.

2 . The ignition device of claim 1 , wherein the booster continues to supply electric energy to the third winding during a period when the second switch is in the on-state.

3 . The ignition device of claim 1 , wherein the booster detects the secondary current flowing into the second winding of the ignition coil, and controls the detected secondary current at a constant value.

4 . The ignition device of claim 2 , wherein the booster detects the secondary current flowing into the second winding of the ignition coil, and controls the detected secondary current at a constant value.

5 . The ignition device of claim 1 , wherein the booster starts supply of electric energy after a lapse of a predetermined time period from a point when the second switch is changed from the off-state to the on-state.

6 . The ignition device of claim 1 , further comprising a delay circuit electrically connected to the drive device and the booster, the delay circuit delays signals from the drive device by a predetermined time period and outputs the signals to the booster.

7 . The ignition device of claim 6 , further comprising a plurality of diodes, each diode electrically connected to the booster, wherein one of the diode is connected to a second end of the third winding.

8 . The ignition device of claim 7 , wherein the booster starts supply of electric energy to the plurality of diodes after a lapse of a predetermined time period from a point when the second switch is changed from the off-state to the on-state.

9 . The ignition device of claim 1 , further comprising a plurality of diodes, each diode electrically connected to the booster, wherein one of the diode is connected to a second end of the third winding.

Assignees

• Sanken Electric Co Ltd

Inventors

• Sekine Nobuaki

Classifications

• F02P15/12 Primary

  having means for strengthening spark during starting · CPC title

• F02P3/0435 Primary

  with semiconductor devices (F02P3/0453, F02P3/051, F02P3/0552 take precedence) · CPC title

• F02P17/12

  Testing characteristics of the spark, ignition voltage or current (testing of sparking plugs H01T13/60) · CPC title

• F02P9/007

  by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition · CPC title

• F02P15/10

  having continuous electric sparks · CPC title