Power supply controller
First Claim
1. A power supply controller, comprising:
- a switching element that is disposed between a power source and a load, the load being an inductive load;
a current detecting element that is connected in parallel to the switching element and outputs a detection signal corresponding to a load current that flows to the switching element;
a voltage generator circuit that generates a generation voltage that corresponds to an output voltage across the load;
an anomaly detecting circuit that, when a voltage corresponding to the detection signal exceeds the generation voltage, outputs an abnormal signal;
a protection circuit that performs a predetermined protection operation based on the abnormal signal that is outputted from the anomaly detecting circuit, the protection circuit forcing the switching element to shut off and be kept in a shutoff state for a predetermined reference shutoff time period, as the predetermined protection operation;
a control circuit into which an on signal and an off signal are inputted, and which turns on the switching element based on input of the on signal and turns off the switching element based on input of the off signal; and
a blocking circuit that blocks execution of the predetermined protection operation by the protection circuit when the off signal is inputted and the voltage corresponding to the detection signal exceeds the generation voltage.
1 Assignment
0 Petitions
Accused Products
Abstract
One aspect of the present invention is directed to a power supply controller that includes a switching element disposed between a power source and a load, a current detecting element connected to the switching element and capable of outputting a detection signal in the form of a load current to the switching element, a voltage generator circuit capable of supplying an output voltage between the switching element and the load, an anomaly detecting circuit capable of outputting an abnormal signal when the load current exceeds a threshold current such that the threshold current corresponds to the output voltage. The present invention can further include a protection circuit capable of performing a predetermined protection operation based on the abnormal signal, a control circuit capable of receiving an on signal and an off signal, wherein the control circuit turns on the switching element when receiving the on signal and turns off the switching element when receiving the off signal, and a blocking circuit capable of blocking the predetermined protection operation when the off signal is received.
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Citations
12 Claims
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1. A power supply controller, comprising:
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a switching element that is disposed between a power source and a load, the load being an inductive load; a current detecting element that is connected in parallel to the switching element and outputs a detection signal corresponding to a load current that flows to the switching element; a voltage generator circuit that generates a generation voltage that corresponds to an output voltage across the load; an anomaly detecting circuit that, when a voltage corresponding to the detection signal exceeds the generation voltage, outputs an abnormal signal; a protection circuit that performs a predetermined protection operation based on the abnormal signal that is outputted from the anomaly detecting circuit, the protection circuit forcing the switching element to shut off and be kept in a shutoff state for a predetermined reference shutoff time period, as the predetermined protection operation; a control circuit into which an on signal and an off signal are inputted, and which turns on the switching element based on input of the on signal and turns off the switching element based on input of the off signal; and a blocking circuit that blocks execution of the predetermined protection operation by the protection circuit when the off signal is inputted and the voltage corresponding to the detection signal exceeds the generation voltage. - View Dependent Claims (2, 3, 4)
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5. A power supply controller, comprising:
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a switching element that is disposed between a power source and a load the load being an inductive load; a current detecting element that is connected in parallel to the switching element and is capable of outputting a detection signal in the form of a load current to the switching element; a voltage generator circuit that is capable of generating a generation voltage that corresponds to an output voltage across the load; an anomaly detecting circuit that is capable of outputting an abnormal signal when a voltage corresponding to the detection signal exceeds the generation voltage; a protection circuit that is capable of performing a predetermined protection operation based on the abnormal signal that is outputted from the anomaly detecting circuit, the protection circuit forcing the switching element to shut off and be kept in a shutoff state for a predetermined reference shutoff time period, as the predetermined protection operation; a control circuit that is capable of receiving an on signal and an off signal, wherein the control circuit turns on the switching element when receiving the on signal and turns off the switching element when receiving the off signal; and a blocking circuit that is capable of blocking the predetermined protection operation when the off signal is received and the voltage corresponding to the detection signal exceeds the generation voltage. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification