Patent ID: 9735767
Date: 2017-08-15
CPC Classifications: H03K

Claim:
1. An electronic control apparatus comprising: a switching element driven by a voltage of a control terminal being controlled; an ON-drive constant-current circuit connected to the control terminal of the switching element, supplying a constant current to the control terminal thereby charging the control terminal of the switching element with electrical charge, the ON-drive constant-current circuit including a current control transistor that controls the current supplied to the control terminal of the switching element, and a current detection resistor that detects a current flowing to the current control transistor and is used for detecting an abnormality in the ON-drive constant-current circuit, the current control transistor being disposed between the switching element and the current detection resistor in a current path where the constant current flows; a drive power supply circuit connected to the ON-drive constant-current circuit, supplying the voltage for driving the switching element; an OFF-drive switching element connected to the control terminal of the switching element, discharging electrical charge from the control terminal of the switching element by being turned ON; and a control circuit adapted to control the ON-drive constant-current circuit and the OFF-drive switching element in response to a drive signal being inputted, thereby controlling the voltage of the control terminal of the switching element so as to drive the switching element, the control circuit being connected to the current detection resistor and detecting a voltage across the current detection resistor, representing the current flowing to the current control transistor, wherein