Buck converter
First Claim
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1. A voltage converter for converting an input DC voltage to a different output DC voltage, comprising:
- an output filter for providing the output voltage;
a voltage switch coupled in series between the input voltage and the output filter, the voltage switch including a gate and a source;
a controller which compares the output voltage to a reference voltage and in response thereto, outputs a control signal; and
a level shifter for driving the voltage switch in response to the control signal and the input voltage, the level shifter operable to prevent the gate to source voltage of the voltage switch from exceeding a predetermined value.
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Abstract
A voltage converter for converting an input voltage to a different output voltage includes an output filter for providing the output voltage and a voltage switch coupled in series between the input voltage and the output filter. A controller compares the output voltage to a reference voltage and in response thereto, provides signals to turn the voltage switch on or off. A level shifter is coupled between the controller and the voltage switch.
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Citations
20 Claims
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1. A voltage converter for converting an input DC voltage to a different output DC voltage, comprising:
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an output filter for providing the output voltage; a voltage switch coupled in series between the input voltage and the output filter, the voltage switch including a gate and a source; a controller which compares the output voltage to a reference voltage and in response thereto, outputs a control signal; and a level shifter for driving the voltage switch in response to the control signal and the input voltage, the level shifter operable to prevent the gate to source voltage of the voltage switch from exceeding a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13)
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7. A voltage converter for converting an input voltage to a different output voltage, comprising:
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an output filter for providing the output voltage; means for comparing the output voltage to a predetermined reference voltage; a voltage switch coupled in series between the input voltage and the output filter, the voltage switch including a gate and a source; means for driving the voltage switch responsive to the comparing means and the input voltage, such that the gate to source voltage differential is sufficient to fully turn the voltage switch on, and the gate to source voltage does not exceed a predetermined value. - View Dependent Claims (8, 9)
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10. A voltage converter for converting an input voltage to a different output voltage comprising:
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a P-channel MOSFET including a gate and a source, the source being responsive to the input voltage; an N-channel MOSFET coupled in series between the P-channel MOSFET and ground, the P-channel MOSFET and the N-channel MOSFET forming a junction therebetween to provide an output; a controller responsive to the output and to a reference voltage to generate signals for turning the P-channel MOSFET and the N-channel MOSFET on or off to generate the output voltage; and a level shifter coupled between the controller and the gate of the P-channel MOSFET for controlling the P-channel MOSFET gate to fully turn the P-channel MOSFET on. - View Dependent Claims (11)
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14. A voltage converter for converting an input DC voltage to a different output DC voltage, comprising:
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an output filter for providing the output voltage; a P-channel MOSFET having a gate, a source and a drain, the source coupled to receive the input voltage and the drain coupled to the output filter; a controller which compares the output voltage to a reference voltage and in response thereto, outputs a control signal; and a level shifter coupled to the gate, the level shifter operable to control the gate to source voltage in response to the control signal and the input voltage, such that the gate to source voltage differential is sufficient to fully turn the P-channel MOSFET on. - View Dependent Claims (15, 16, 17, 18)
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19. A voltage converter for converting an input DC voltage to a different output DC voltage, comprising:
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an output filter for providing the output voltage; first and second switches coupled in series between the input voltage and the output filter; a controller which compares the output voltage to a reference voltage and in response thereto, outputs a control signal; a level shifter for driving the voltage switch in response to the control signal and the input voltage; and first and second safety devices responsive to the first and second switches, the first and second safety devices operable to prevent the first and second switches from simultaneously being on. - View Dependent Claims (20)
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Specification