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US 2018/0123462 A1Published application
Surge-tolerant power supply system
AssigneeElectro-Motive Diesel, Inc.
InventorJames F. WIEMEYER
Life of this patent
Estimating the term…
Abstract
An apparatus for providing surge-tolerant power to an appliance is provided. The apparatus includes an input circuit for receiving a source of DC voltage. The apparatus also includes a pass device having a first terminal, a control terminal and a second terminal. Further, the apparatus includes a first means for providing an output voltage based on an input of the pass device. The apparatus also includes a second means for applying a voltage to a control terminal of the pass device based on the output voltage. The voltage is sufficient to put the pass device into a low impedance state between the first terminal and the second terminal thereof.
Claims20
A surge-tolerant power supply system comprising:
- an input circuit having a first input terminal and a second input terminal configured to receive a source of DC voltage;
- an N-channel MOSFET having a gate terminal, a source terminal, and a drain terminal, the N-channel MOSFET having a characteristic threshold voltage between the gate terminal and the source terminal, and the drain terminal being electrically connected to a positive output of the input circuit;
- a switch mode DC-to-DC converter having an input electrically connected to the source terminal of the N-channel MOSFET and a negative output of the input circuit;
- a transformer driver having an input electrically connected to an output of the switch mode DC-to-DC converter;
- an isolation transformer having a primary winding electrically connected to an output of the transformer driver;
- a rectifier-filter circuit having an input electrically connected to a secondary winding of the isolation transformer and having an output configured to provide an output voltage;
- a bias circuit having a first input electrically connected to the positive output of the input circuit and a second input electrically connected to the negative output of the input circuit;
- and
- a DC bias boost circuit having a first input electrically connected to an auxiliary winding of the isolation transformer, a second input electrically connected to an output of the bias circuit, and an output electrically connected to the gate terminal of the N-channel MOSFET,
- wherein the DC bias boost circuit is configured to apply a voltage at the gate terminal of the N-channel MOSFET that exceeds the characteristic threshold voltage between the gate terminal and the source terminal of the N-channel MOSFET.
7 more elements
A surge-tolerant power supply comprising:
- an input circuit configured to receive a source of DC voltage;
- a pass device having a first terminal electrically connected to a positive output of the input circuit;
- a voltage converter circuit having an input and at least two isolated outputs, the input being electrically connected to a second terminal of the pass device, and a first isolated output of the at least two isolated outputs is configured to provide an output voltage;
- and
- a bias circuit having a first input electrically connected to a second output of the at least two isolated outputs of the voltage converter circuit, a second input electrically connected to the positive output of the input circuit, and an output electrically connected to a control terminal of the pass device, wherein the bias circuit is configured to apply a voltage on the control terminal of the pass device sufficient to put the pass device into a low impedance state between the first terminal and the second terminal of the pass device.
2 more elements
A surge-tolerant power supply comprising:
- an input circuit configured to receive a source of DC voltage;
- a pass device having a first terminal electrically connected to an output of the input circuit;
- a voltage converter circuit having an input and at least one output, the input being electrically connected to a second terminal of the pass device;
- and
- a bias circuit having a first input electrically connected to a first of the least one output of the voltage converter circuit, a second input electrically connected to the output of the input circuit, and an output electrically connected to a control terminal of the pass device, wherein the bias circuit is configured to apply, after a predetermined start-up period, a voltage on the control terminal of the pass device sufficient to put the pass device into a low impedance state between the first terminal and the second terminal of the pass device.
2 more elements
Dependencies are inferred from the claim text.