System for detecting the state of a switch device
First Claim
1. A seat heater control circuit comprising:
- an indicator driver circuit having an output;
a controller connected to said indicator driver circuit and to a seat heater driver;
a seat heater control switch operatively connected to said controller, said controller, when energized, controlling operation of said indicator driver circuit and the seat heater driver in response to said seat heater control switch, said indicator driver circuit connecting the output of said indicator driver circuit to a first voltage level in response to said controller indicating activation of said seat heater control switch;
an indicator operatively connected between the output of said indicator driver circuit and a vehicle ignition switch having at least two states, a first state of the vehicle ignition switch connecting said indicator to a second voltage level which is greater than the first voltage level, said indicator being activated in response to the output of said indicator driver circuit being at the first voltage level and the vehicle ignition switch being in the first state so that said indicator is connected to the second voltage level, andmonitoring circuitry electrically connected to an electrical node between said indicator and the output of said indicator driver circuit, said monitoring circuitry being responsive to the at least two states of the vehicle ignition switch through said indicator, said monitoring circuitry being operative to effect energization of said controller in response to the vehicle ignition switch being in the first state and deenergization of said controller in response to the vehicle ignition switch being in a second state.
1 Assignment
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Accused Products
Abstract
A system (10) for detecting the state of a switch device (60) includes a driver circuit (40) having an output (42) operative to provide a driver output signal. An indicator (44) is electrically connected between the driver circuit (40) and the switch device (60). The indicator (44) is activated in response to the driver output signal and upon the switch device (60) being in a first state. A monitoring circuit (70), which is responsive to the switch device (60) through the indicator (44), is electrically connected to a node (64) between the indicator (44) and the driver circuit (40). The monitoring circuit (70) is operative to provide a first signal in response to the switch device (60) being in the first state and a second signal in response to the switch device (60) being in a second state. The monitoring circuit (70) controls energization of a controller (28) so as to power the controller (28) when the switch device (60) is in the first state. The controller (28) controls the driver circuit (40) and a use device (12) in response to a control switch (26) condition.
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Citations
11 Claims
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1. A seat heater control circuit comprising:
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an indicator driver circuit having an output; a controller connected to said indicator driver circuit and to a seat heater driver; a seat heater control switch operatively connected to said controller, said controller, when energized, controlling operation of said indicator driver circuit and the seat heater driver in response to said seat heater control switch, said indicator driver circuit connecting the output of said indicator driver circuit to a first voltage level in response to said controller indicating activation of said seat heater control switch; an indicator operatively connected between the output of said indicator driver circuit and a vehicle ignition switch having at least two states, a first state of the vehicle ignition switch connecting said indicator to a second voltage level which is greater than the first voltage level, said indicator being activated in response to the output of said indicator driver circuit being at the first voltage level and the vehicle ignition switch being in the first state so that said indicator is connected to the second voltage level, and monitoring circuitry electrically connected to an electrical node between said indicator and the output of said indicator driver circuit, said monitoring circuitry being responsive to the at least two states of the vehicle ignition switch through said indicator, said monitoring circuitry being operative to effect energization of said controller in response to the vehicle ignition switch being in the first state and deenergization of said controller in response to the vehicle ignition switch being in a second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification