Power supply circuit with adaptive error detection and an electronic control circuit including the same
AssigneeDenso Corporation
InventorTakahisa Koyasu
Life of this patent
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Abstract
A supply current is supplied to an error detection circuit for detecting an error condition of an IC of the power supply circuit such as an overheat detection circuit only when the detection current of the power transistor of the power supply circuit is higher than a reference. Moreover, a supply current to the constant current source is supplied only when the detection current of the power transistor is higher than the reference to suppress the power consumption. Thus, suppression of the power consumption in the battery backup operation for a RAM during ignition off condition is provided. The current detection of the power transistor of the power supply circuit is detected with a series resistor or a multi-collector transistor.
Claims10
A power supply circuit comprising:
- a transistor for supplying a current to a load;
- current detection means for detecting a magnitude of said current;
- an error detection circuit for detecting an error condition caused by a relatively great magnitude of said current and outputting the detection result;
- and
- a control circuit for operating said error detection circuit when said magnitude of said current is greater than a threshold value.
An electronic control unit for a motor vehicle comprising:
- a first control circuit for effecting a predetermined operation regarding said motor vehicle;
- and
- an power supply for supplying a power to said first control circuit including;
- a transistor for generating a current as said power;
- current detection means for detecting a magnitude of said current;
- an error detection circuit for detecting an error condition caused by a relatively great magnitude of said current and outputting the detection result;
- and
- a second control circuit for operating said error detection circuit when said magnitude of said current is greater than a threshold value.
Dependencies are inferred from the claim text.