Hot-swap protection circuit
First Claim
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1. A circuit comprising:
- a switch configured to couple a target circuit with a source of power;
a first detector configured to detect power provided by the source of power, the first detector operatively coupled with the switch, wherein the switch closes responsive to the first detector;
a second detector configured to detect noise in the power, the second detector operatively coupled to the switch, wherein a conductivity of the switch varies responsive to the second detector;
a positive terminal; and
a negative terminal, wherein the switch is a transistor device having a gate, a source, and a drain, wherein the second detector comprises;
a bias voltage source;
an operational amplifier having;
an inverting input coupled with the positive terminal and coupled with the bias voltage source;
a non-inverting input coupled with a negative terminal; and
an output coupled to the gate of the switch, wherein the bias voltage source is coupled with the first detector.
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Abstract
Embodiments of the present invention provide methods and circuitry for protecting a circuit during hot-swap events. Hot swap protection circuitry includes as overcurrent detection circuit which decouples power from a load. Circuitry is provided to detect ground-fault conditions. Noise detection circuitry is provided to reduce noise in the power that is delivered to the load.
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Citations
14 Claims
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1. A circuit comprising:
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a switch configured to couple a target circuit with a source of power;
a first detector configured to detect power provided by the source of power, the first detector operatively coupled with the switch, wherein the switch closes responsive to the first detector;
a second detector configured to detect noise in the power, the second detector operatively coupled to the switch, wherein a conductivity of the switch varies responsive to the second detector;
a positive terminal; and
a negative terminal, wherein the switch is a transistor device having a gate, a source, and a drain, wherein the second detector comprises;
a bias voltage source;
an operational amplifier having;
an inverting input coupled with the positive terminal and coupled with the bias voltage source;
a non-inverting input coupled with a negative terminal; and
an output coupled to the gate of the switch, wherein the bias voltage source is coupled with the first detector. - View Dependent Claims (2, 3, 4)
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5. A circuit for coupling a power source to an electronic device comprising:
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first circuit means for detecting a connection event wherein a connection is made between a device and a power source, the first circuit means configured to be selectively coupled to and decoupled from the power source;
second circuit means, responsive to the first circuit means, for coupling power from the power source to the electronic device so that power is applied to the electronic device in a gradual manner;
third circuit means for detecting an overcurrent event wherein the electronic device draws current from the power source exceeding a predetermined level of current; and
fourth circuit means for reducing the amount of power that is applied to the electronic device in response to the third means. - View Dependent Claims (6, 7, 8, 9)
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10. A circuit for coupling a power source to a device comprising:
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first circuit means for detecting a connection event wherein a connection is made between a device and a power source, the first circuit means configured to be selectively coupled to and decoupled from the power source;
second circuit means, responsive to the first circuit means, for coupling power from the power source to the device, the second circuit means operable to vary the amount of power that is applied to the device;
third circuit means for detecting a change in an electrical parameter of the second circuit means indicative of a disconnection between the circuit and the power source;
fourth circuit means for decoupling the power source from the device in response to the third means. - View Dependent Claims (11, 12)
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13. A circuit for coupling a power source to a device comprising:
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first circuit means for detecting a connection event wherein a connection is made between a device and a power source, the first circuit means configured to be selectively coupled to and decoupled from the power source;
second circuit means, responsive to the first circuit means, for providing a varying amount of power from the power source to the device;
third circuit means for detecting when the device draws current from the power source exceeding a predetermined level of current;
fourth circuit means for decoupling the power source from the device in response to the third means;
fifth circuit means for detecting a change in an electrical parameter of the second circuit means indicative of a disconnection between the circuit and the power source; and
sixth circuit means for decoupling the power source from the device in response to the fifth means. - View Dependent Claims (14)
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Specification