High Voltage SEPIC Converter
First Claim
1. A SEPIC converter with over-voltage protection that comprises:
- a high-side inductor connected between a node Vw and a node Vx;
a power MOSFET connected in series between the node Vx and ground;
a first capacitor connected between the node Vx and a node Vy;
a low-side inductor connected between the node Vy and ground;
a rectifier diode connected between the node Vy and a node Vout;
an output capacitor connected between the node Vout and ground;
a PWM control circuit connected to drive the gate of the power MOSFET;
an over-voltage protection MOSFET connected to control the flow of current from an input supply to the node Vw and the PWM control circuit; and
a comparator connected to drive the gate of the over-voltage protection MOSFET so that the node Vw and the PWM control circuit are disconnected from the input supply when the voltage of the input supply exceeds a predetermined value Vref.
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Accused Products
Abstract
A SEPIC converter with over-voltage protection includes a high-side inductor that connects a node Vw to a node Vx. The node Vx is connected, in turn to ground by a power MOSFET. The node Vx is also connected to a node Vy by a first capacitor. The node Vy is connected to ground by a low-side inductor. A rectifier diode further connects the node Vy and a node Vout and an output capacitor is connected between the node Vout and ground. A PWM control circuit is connected to drive the power MOSFET. An over-voltage protection MOSFET connects an input supply to the PWM control circuit and the node Vw. A comparator monitors the voltage of the input supply. If that voltage exceeds a predetermined value Vref the comparator output causes the over-voltage protection MOSFET to disconnect the node Vw and the PWM control circuit from the input supply.
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Citations
10 Claims
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1. A SEPIC converter with over-voltage protection that comprises:
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a high-side inductor connected between a node Vw and a node Vx; a power MOSFET connected in series between the node Vx and ground; a first capacitor connected between the node Vx and a node Vy; a low-side inductor connected between the node Vy and ground; a rectifier diode connected between the node Vy and a node Vout; an output capacitor connected between the node Vout and ground; a PWM control circuit connected to drive the gate of the power MOSFET; an over-voltage protection MOSFET connected to control the flow of current from an input supply to the node Vw and the PWM control circuit; and a comparator connected to drive the gate of the over-voltage protection MOSFET so that the node Vw and the PWM control circuit are disconnected from the input supply when the voltage of the input supply exceeds a predetermined value Vref.
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2. A SEPIC converter with over-voltage protection that comprises:
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a high-side inductor connected between an input supply and a node Vx; a power MOSFET connected in series between the node Vx and ground; a first capacitor connected between the node Vx and a node Vy; a low-side inductor connected between the node Vy and ground; a rectifier diode connected between the node Vy and a node Vout; an output capacitor connected between the node Vout and ground; a PWM control circuit connected to drive the gate of the power MOSFET; and a linear regulator connected to control the flow of current from the input supply to the PWM control circuit. - View Dependent Claims (3, 4, 5)
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6. A method for controlling a SEPIC converter, where the SEPIC converter includes a high-side inductor connected between a node Vw and a node Vx;
- a power MOSFET connected in series between the node Vx and ground;
a first capacitor connected between the node Vx and a node Vy;
a low-side inductor connected between the node Vy and ground;
a rectifier diode connected between the node Vy and a node Vout;
an output capacitor connected between the node Vout and ground;
a PWM control circuit connected to drive the gate of the power MOSFET;
the method comprising;controlling the flow of current from an input supply to the node Vw and the PWM control circuit with an over-voltage protection MOSFET; and driving the gate of the over-voltage protection MOSFET so that the node Vw and the PWM control circuit are disconnected from the input supply when the voltage of the input supply exceeds a predetermined value Vref.
- a power MOSFET connected in series between the node Vx and ground;
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7. A method for controlling a SEPIC converter, where the SEPIC converter includes a high-side inductor connected between a node Vw and a node Vx;
- a power MOSFET connected in series between the node Vx and ground;
a first capacitor connected between the node Vx and a node Vy;
a low-side inductor connected between the node Vy and ground;
a rectifier diode connected between the node Vy and a node Vout;
an output capacitor connected between the node Vout and ground;
a PWM control circuit connected to drive the gate of the power MOSFET;
a method comprising;controlling the flow of current from the input supply to the PWM control circuit using a linear regulator. - View Dependent Claims (8, 9, 10)
- a power MOSFET connected in series between the node Vx and ground;
Specification