US 9,809,120 B2
Discrete under voltage/over voltage monitoring circuit
Larry A. Sparling, Buffalo Grove, IL (US); Russ Dalbke, Fox River Grove, IL (US); and Amit Bahl, Algonquin, IL (US)
Assigned to Continental Automotive Systems, Inc., Auburn Hills, MI (US)
Filed by Continental Automotive Systems, Inc., Auburn Hills, MI (US)
Filed on Sep. 23, 2015, as Appl. No. 14/862,335.
Prior Publication US 2017/0080807 A1, Mar. 23, 2017
Int. Cl. B60L 11/18 (2006.01); G01R 19/165 (2006.01); G01R 19/25 (2006.01)
CPC B60L 11/18 (2013.01) [G01R 19/16538 (2013.01); G01R 19/2513 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A system for controlling electric energy provided to an electrical load in a vehicle, the system comprising:
an electrically operable driver switch, configured to connect the load to a power supply;
a power supply coupled to the electrically operable driver switch, the power supply being configured to:
receive electric energy from a vehicle battery;
provide current to the electrical load through the electrically operable driver switch;
generate first and second supply voltages from the vehicle battery and provide the first and second supply voltages as outputs of the power supply;
provide first and second complementary power supply status output signals, states of the first and second complementary power supply status output signals indicating at least whether the battery voltage is between a low voltage limit and a high voltage limit;
a computer, operatively coupled to the power supply to receive the first and second supply voltages, the computer being configured to generate and output a third supply voltage, and provide first and second complementary microcontroller status signals, states of the first and second complementary microcontroller status signals indicating at least whether the microcontroller is operating properly;
a logic circuit coupled to the power supply, the computer and to the electrically operable driver switch, the logic circuit having a first output, which provides a first control signal to the electrically operable driver switch responsive to states of the first and second complementary microcontroller status signals and responsive to states of the first and second complementary power supply status output signals; and
a voltage monitor coupled to the computer, the voltage monitor receiving the third supply voltage from the computer and providing a reference to the computer, the voltage monitor also being coupled to the electrically operable driver switch and providing a second control signal to the electrically operable switch;
wherein the electrically operable driver switch closes and provides battery power to the load responsive to both the first and second control signals.