Patent ID: 8482398
Filing Date: 2013-07-09
Classification: B60Q

Abstract:
1. An electronic control circuit configured to control a lamp of a vehicle to selectively operate as a turning signal lamp, an emergency signal lamp, or a vehicle running lamp, the circuit comprising: a supply circuit configured to supply a power source voltage to the lamp if either or both of a vehicle running signal and a flash signal have a first input value; a control circuit configured to generate a control signal having a first control value if the vehicle running signal and the flash signal have different values, and a second control value if the vehicle running signal and the flash signal have the same value; and a disrupt circuit configured to connect the lamp to ground if the control signal has the first control value, but to disrupt that connection if the control signal has the second control value wherein the control circuit comprises: wherein the first input value, the first intermediate value, and the first control value comprise relatively high voltages and the second input value, the second intermediate value, and the second control value comprise relatively low voltages, respectively; and wherein the first intermediate circuit comprises a first pull-up circuit and a first switching circuit, wherein the first pull-up circuit is configured to pull the voltage of a first node associated with the first intermediate signal up to the first intermediate value if the vehicle running signal has the first input value and the first switching circuit is not activated, wherein the first switching circuit is activated by the flash signal having the first input value, and wherein the first switching circuit is configured to, when activated, connect the first node to ground and thereby pull the voltage of the first node down to the second intermediate value; and wherein the second intermediate circuit comprises a second pull-up circuit and a second switching circuit, wherein the second pull-up circuit is configured to pull the voltage of a second node associated with the second intermediate signal up to the first intermediate value if the flash signal has the first input value and the second switching circuit is not activated, wherein the second switching circuit is activated by the vehicle running signal having the first input value, and wherein the second switching circuit is configured to, when activated, connect the second node to ground and thereby pull the voltage of the second node down to the second intermediate value.