US 2016/0109933 A1 · System and Method for a Power Sequencing Circuit

Abstract

An embodiment is a circuit including a main power supply coupled to a first node, a charge reservoir coupled between a second node and ground, an isolation circuit coupled between the first node and the second node, and a plurality of secondary power supplies coupled to the second node, the plurality of secondary power supplies configured to receive power from the main power supply. The circuit further includes a detector circuit coupled to the first node, the detector circuit configured to detect the presence and absence of a first supply voltage at the first node, and a timing circuit coupled between the detector circuit and the plurality of secondary power supplies, the timing circuit configured to enable and disable the plurality of secondary power supplies in predetermined sequences based on the detection of the first supply voltage by the detector circuit.

Claims22

Dependent claims

A circuit comprising:

a main power supply coupled to a first node;
a charge reservoir coupled between a second node and ground;
an isolation circuit coupled between the first node and the second node;
a plurality of secondary power supplies coupled to the second node, the plurality of secondary power supplies configured to receive power from the main power supply;
a detector circuit coupled to the first node, the detector circuit configured to detect the presence and absence of a first supply voltage at the first node;
and
a timing circuit coupled between the detector circuit and the plurality of secondary power supplies, the timing circuit configured to enable and disable the plurality of secondary power supplies in predetermined sequences based on the detection of the first supply voltage by the detector circuit.

4 more elements

A power sequencing circuit comprising:

a main power supply configured to supply a first supply voltage to a first node;
a charge reservoir configured to be charged by at least a portion of the first supply voltage;
a plurality of voltage regulators configured to receive at least a portion of the first supply voltage;
a detector circuit having two control inputs and two outputs, a first control input coupled to the first node and a second control input coupled to ground, and a first output coupled to a second node and the second output coupled to a third node, the detector circuit configured to determine the status of the first supply voltage at the first node and couple voltages to the second and third nodes based on the determined status of the first supply voltage;
and
a plurality of timing circuits, each of the plurality of timing circuits coupled to the second and third nodes and an enable pin of one of the plurality of voltage regulators, the plurality of timing circuits configured to enable and disable the plurality of voltage regulators in predetermined sequences based on the voltages at the second and third nodes.

3 more elements

Dependencies are inferred from the claim text.

System and Method for a Power Sequencing Circuit

Life of this patent

System and Method for a Power Sequencing Circuit

Life of this patent

Abstract

Claims22