Pyro igniter circuit and testing method
AssigneeSamsung SDI Co., Ltd.
InventorsMichael Erhart, Wolfgang Reinprecht
Life of this patent
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Abstract
A pyro igniter circuit and a method for testing the same is provided. The pyro igniter circuit includes a supervisory circuit configured to: transmit a test signal having a pulse duration time below an igniter activation pulse time of a pyro igniter disconnect element and/or an ignition control signal, in response to the transmitted test signal, has an amplitude below an igniter activation amplitude of the pyro igniter disconnect element; and receive a diagnostic response signal in response to the transmitted test signal.
Claims17
A pyro igniter circuit comprising:
- a shunt resistor connected in series with a power line;
- an amplifier having first and second inputs respectively electrically connected to first and second terminals of the shunt resistor;
- a pyro igniter disconnect element electrically connected to an output of the amplifier and configured to cut the power line based on an ignition control signal received from the output of the amplifier;
- a coupling resistor electrically interconnected between the first input of the amplifier and the first terminal of the shunt resistor;
- and
- a supervisory circuit electrically connected to a node, the node being interconnected between the first input of the amplifier and the coupling resistor,
- wherein the supervisory circuit is configured to:
- transmit a test signal to the node, the test signal having a pulse duration time below an igniter activation pulse time of the pyro igniter disconnect element and/or the ignition control signal, in response to the transmitted test signal, has an amplitude below an igniter activation amplitude of the pyro igniter disconnect element;
- and
- receive a diagnostic response signal in response to the transmitted test signal.
A testing method for testing a pyro igniter circuit, the pyro igniter circuit comprising a shunt resistor connected in series with a power line, an amplifier comprising first and second inputs respectively electrically connected to first and second terminals of the shunt resistor, a pyro igniter disconnect element electrically connected to an output of the amplifier and configured to cut the power line based on an ignition control signal received from the output of the amplifier, a coupling resistor electrically interconnected between the first input of the amplifier and the first terminal of the shunt resistor, the method comprising:
- transmitting a test signal to a node, the node being interconnected between the first input of the amplifier and the coupling resistor, the test signal having a pulse duration time below an igniter activation pulse time of the pyro igniter disconnect element and/or the ignition control signal, in response to the transmitted test signal, having an amplitude below an igniter activation amplitude of the pyro igniter disconnect element;
- and
- receiving a diagnostic response signal in response to the transmitted test signal.
Dependencies are inferred from the claim text.