Electronic control apparatus having switching element and drive circuit
First Claim
1. An electronic control apparatus comprising:
- a switching element having a control terminal, the switching element being driven by a voltage at the control terminal;
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 element that detects the current flowing to the current control transistor, an input terminal of the current control transistor being connected to a drive power supply unit and an output terminal of the current control transistor being connected to the control terminal of the switching element, and the current detection element being connected to the current control transistor;
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, whereinthe control circuit controls the current control transistor based on the voltage of the current detection element and supplies the constant current to the control terminal of the switching element, and detects an abnormality in the ON-drive constant-current circuit based on a voltage between the input terminal of the current control transistor and the output terminal of the current control transistor.
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Accused Products
Abstract
An electronic control apparatus includes a switching element having a control terminal; an ON-drive constant-current circuit for supplying a constant current to the control terminal, thereby charging the control terminal of the switching element with electrical charge; an OFF-drive switching element for 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 to drive the switching element. The ON-drive constant-current circuit includes a current control transistor and a current detection element. The control circuit controls the current control transistor based on the voltage of the current detection resistor and detects abnormality in the ON-drive constant-current circuit based on a source-drain voltage of the current control transistor.
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Citations
12 Claims
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1. An electronic control apparatus comprising:
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a switching element having a control terminal, the switching element being driven by a voltage at the control terminal; 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 element that detects the current flowing to the current control transistor, an input terminal of the current control transistor being connected to a drive power supply unit and an output terminal of the current control transistor being connected to the control terminal of the switching element, and the current detection element being connected to the current control transistor; 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, wherein the control circuit controls the current control transistor based on the voltage of the current detection element and supplies the constant current to the control terminal of the switching element, and detects an abnormality in the ON-drive constant-current circuit based on a voltage between the input terminal of the current control transistor and the output terminal of the current control transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification