Control circuit with temperature compensation
Abstract
Abstract A CIRCUIT WHICH WILL SWITCH POWER TO LOAD IN RESPONSE TO A PRESCRIBED INPUT SIGNAL INCLUDES AS THE SWITCH MEANS, A SILICON-CONTROLLED RECTIFICER (SCR) HAVING A FIRING VOLTAGE WHICH CHANGES WITH TEMPERATURE. A DIFFERENTIAL AMPLIFIER RECEIVES AN INPUT SIGNAL AND PROVIDES A DIFFERENTIAL OUTPUT SIGNAL TO A COMPLEMENTARY DETECTOR, THE OUTPUT SIGNAL OF WHICH IS UTILIZED TO TRIGGER THE SCR TO ITS ON STATE OF OPERATION. A CURRENT SOURCE TRANSISTOR IS PROVIDED TO CONTROL THE CURRENT IN THE DIFFERENTIAL AMPLIFIER, AND AS TEMPERATURE CHANGES THE CURRENT SOURCE TRANSISTOR VARIES THE CURRENT IN THE DIFFERENTIAL AMPLIFIER IN ORDER TO CHANGE THE GAIN THEREOF SO THAT THE OUTPUT OF THE COMPLEMENTARY DETECTOR PROVIDES A TEMPERATURE-COMPENSATED SIGNAL FOR FIRING THE SCR AT THE PROPER SIGNAL LEVEL.
Inventors
- 👤 Melbourne J Hellstrom
- 👤 Charles L Laughinghouse
Bibliographic Details
Claims Analysis
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