| 摘要 |
PROBLEM TO BE SOLVED: To detect the temperature of a load driving element with good control, to enable a control of a load by a temperature-electric transducer, and also to contrive a miniaturization of an electronic control unit by the formation of a load drive circuit into a semiconductor integrated circuit, by a method wherein a heat transfer medium is provided between the transducer and the element. SOLUTION: In a load drive circuit 16, a drive signal is inputted in a diagnostic circuit 14 and at the same time, a state signal which is flowed via a temperature-electric transducer 31 is also inputted in the circuit 14. In the case where the temperature of a load driving element 11 rises in comparison with a temperature of a prescribed value, the output of a signal is stopped to a control circuit 15. The circuit 15 outputs a signal for controlling the resistance of the element 11 on the basis of a signal from the signal circuit 14. In the element 11, prescribed power is consumed and is dissipated to the outside as heat. Therefore, a heat transfer medium 25 is provided between a transducer 31 and the element 11, so that the heat dissipated from the element 11 is rapidly transferred to the transducer 31 and a detection of the temperature of a load 13 is indirectly enabled. |
