Multiplexed temperature sensing circuit for hid lamp ballast

Details Multiplexed temperature sensing circuit for hid lamp ballast Multiplexed temperature sensing circuit for hid lamp ballast

H - Electricity

05

B

H05B 41/02 (2006.01) H05B 41/14 (2006.01) H05B 41/36 (2006.01)

Patent

CA 2550131

A temperature sensing circuit for a ballast for a HID lamp multiplexes the temperature measurement function with another function to reduce the number of pins required for the temperature measurement function performed by the microcontroller of the ballast. The circuit includes a microcontroller having a first A/D input/output pin, a second A/D input/output pin and a multifunction pin, a temperature measurement circuit connected to the second A/D pin, a timing circuit connected to the first A/D pin, and a switch connected to the multifunction pin, temperature measurement circuit and timing circuit. The switch activates the temperature measurement function by connecting the temperature measurement circuit to the multifunction pin in a first position and deactivates the function by disconnecting the temperature measurement circuit from the multifunction pin in a second position.

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