Switching power supply system with pre-regulator for circuit or personnel protection devices
First Claim
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1. A switching power supply system for a circuit or personnel protection device, comprising:
- an input stage for outputting a rectified signal;
a switching regulator for outputting a DC output signal;
a pre-regulator in cascade between the input stage and the switching regulator, the pre-regulator including a transistor for providing variable resistance, and a control part for maintaining a fixed voltage at a gate of the transistor; and
an output stage for filtering noise from the DC output signal.
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Abstract
A linear pre-regulator for cascading with a switching regulator for providing a load current for a circuit or personnel protection device includes a transistor for providing a series variable resistance when a load current changes. The series variable resistance includes a control node, and a control part maintains a substantially fixed voltage at the control node when the current drawn by the switching regulator changes. A storage part may be included to provide a voltage at a drain of a transistor forming the series variable resistance during an OFF-to-ON transition of the transistor.
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Citations
17 Claims
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1. A switching power supply system for a circuit or personnel protection device, comprising:
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an input stage for outputting a rectified signal;
a switching regulator for outputting a DC output signal;
a pre-regulator in cascade between the input stage and the switching regulator, the pre-regulator including a transistor for providing variable resistance, and a control part for maintaining a fixed voltage at a gate of the transistor; and
an output stage for filtering noise from the DC output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system board for a circuit or personnel protection device, comprising:
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an integrated circuit receiving a load current;
a switching power supply system; and
an interface circuit for interfacing the switching power supply system to the integrated circuit, wherein the switching power supply system includes a linear pre-regulator in cascade with a switching regulator, the linear regulator including a transistor for providing a variable resistance, a control part for maintaining a fixed voltage at a gate of the transistor, and a storage part for providing a voltage at a drain of the transistor during an OFF-to-ON transition of the transistor.
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12. A switching power supply system for a circuit or personnel protection device, comprising:
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an input stage for outputting a rectified signal;
a switching regulator for outputting a DC output signal;
a linear pre-regulator coupled between the input stage and the switching regulator, the pre-regulator including a series variable resistance that decreases in response to increases in a current drawn by the switching regulator and increases in response to decreases in the current drawn, said series variable resistance including a control node, and a control part for maintaining a substantially fixed voltage at said control node; and
an output stage coupling the DC output signal to a load. - View Dependent Claims (13)
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14. A method of providing a load current to a circuit or personnel protection device, comprising:
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pre-regulating a rectified signal through a transistor cascaded with a switching regulator for providing a variable resistance when a load current changes; and
maintaining a fixed voltage at a gate of the transistor when the load current changes. - View Dependent Claims (15)
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16. A method of supplying power to a circuit or personnel protection device, comprising:
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outputting a rectified signal at an input stage;
receiving said rectified signal in a switching regulator and outputting a DC output signal from said switching regulator;
linearly pre-regulating said rectified signal between said input stage and said switching regulator with a series variable resistance that decreases in response to increases in a current drawn by the switching regulator and increases in response to decreases in the current drawn; and
coupling said DC output signal to a load. - View Dependent Claims (17)
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Specification