Power Supply Circuit for Selectively Supplying Power to a Vehicle Accessory

A power supply circuit for selectively supplying power to an accessory in a vehicle, said power supply circuit comprising:

• a switch coupled to a power line from a battery of the vehicle and to a power input of the accessory;
• and
• a control circuit coupled to said switch, said control circuit monitors a voltage level of the battery and selectively supplies power from the battery to the accessory in response to the voltage level of the battery, wherein said control circuit supplies power from the battery to the accessory when the voltage level of the battery increases at least a predetermined amount.

A power supply circuit for selectively supplying power to an accessory in a vehicle, said power supply circuit comprising:

• a switch coupled to a power line from a battery of the vehicle and to a power input of the accessory;
• and
• a control circuit coupled to said switch, said control circuit monitors a voltage level of the battery and selectively supplies power from the battery to the accessory in response to the voltage level of the battery, wherein said control circuit supplies power from the battery to the accessory when the voltage level of the battery decreases from a nominal voltage level by a first predetermined amount to a lower voltage level and subsequently increases a second predetermined amount to a higher voltage within a predetermined time period.

A power supply circuit for selectively supplying power to an accessory in a vehicle, said power supply circuit comprising:

• a switch coupled to a power line from a battery of the vehicle and to a power input of the accessory;
• and
• a control circuit coupled to said switch, said control circuit monitors a voltage level of the battery, computes an average of the battery voltage level, and selectively supplies power from the battery to the accessory in response to the averaged voltage level of the battery.

A power supply circuit for selectively supplying power to an accessory in a vehicle, said power supply circuit comprising:

• a switch coupled to a power line from a battery of the vehicle and to a power input of the accessory;
• and
• a control circuit coupled to said switch, said control circuit monitors a voltage level of the battery and selectively supplies power from the battery to the accessory in response to the voltage level of the battery, wherein said control circuit disrupts a supply of power from the battery to the accessory when the voltage level of the battery decreases from a first voltage level by at least a predetermined amount to a lower voltage level.