Switch control circuit and igniter
AssigneeRohm Co., Ltd.
InventorsAtsushi Taguchi, Akira Daicho
Life of this patent
Estimating the term…
Abstract
A switch control circuit controls a switch element connected to a primary coil of an ignition coil in accordance with an ignition signal. The switch element includes a transistor and a protection element connected between a collector and gate of the transistor. The switch control circuit uses a voltage at a gate terminal controlling the transistor or a voltage corresponding to a collector current of the transistor as a detection voltage and generates a status detection signal corresponding to a change in the detection voltage.
Claims13
A switch control circuit that controls a switch element connected to a primary coil of an ignition coil in accordance with an ignition signal, wherein the switch element includes a transistor and a protection element connected between a collector and gate of the transistor, the switch control circuit comprising:
- a status detection circuit that uses a voltage at a gate terminal controlling the transistor or a voltage corresponding to a collector current of the transistor as a detection voltage and generates a status detection signal corresponding to a change in the detection voltage;
- a signal output circuit that outputs the status detection signal to a terminal;
- and
- a current detection circuit that detects the collector current of the transistor,
- wherein the signal output circuit combines a detection signal of the current detection circuit and a detection signal of the status detection circuit to generate an ignition confirmation signal.
An ignitor, comprising:
- a switch element connected to a primary coil of an ignition coil;
- and
- a switch control circuit that controls the switch element in accordance with an ignition signal, wherein
- the switch element includes a transistor and a protection element connected between a collector and gate of the transistor, and
- the switch control circuit includes:
- a status detection circuit that uses a voltage at a gate terminal controlling the transistor or a voltage corresponding to a collector current of the transistor as a detection voltage and generates a status detection signal corresponding to a change in the detection voltage;
- a signal output circuit that outputs the status detection signal to a terminal;
- and
- a current detection circuit that detects a collector current of the transistor,
- wherein the signal output circuit combines a detection signal of the current detection circuit and a detection signal of the status detection circuit to generate an ignition confirmation signal.
A switch control circuit that controls a switch element connected to a primary coil of an ignition coil in accordance with an ignition signal, wherein the switch element includes a transistor and a protection element connected between a collector and gate of the transistor, the switch control circuit comprising:
- a status detection circuit that uses a collector voltage of the transistor as a detection voltage and generates a status detection signal corresponding to a change in the detection voltage;
- a signal output circuit that outputs the status detection signal to a terminal;
- and
- a current detection circuit that detects a collector current of the transistor,
- wherein the signal output circuit combines a detection signal of the current detection circuit and a detection signal of the status detection circuit to generate an ignition confirmation signal.
Dependencies are inferred from the claim text.