Controlled adaptive power limiter
AssigneeMicrochip Technology Incorporated
InventorGheorghe Turcan
Life of this patent
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Abstract
A power limiter for a switched mode power supply includes an operational amplifier and a comparator circuit. The operational amplifier is configured to receive an input voltage supplied to the SMPS as a first input and a reference voltage as a second input. The comparator circuit is configured to receive an output of the operational amplifier, receive a current sense signal, and generate an output signal configured to control a power generator. The output signal is based on a comparison between the output of the operational amplifier and the current sense signal.
Claims18
A power limiter for a switched mode power supply (SMPS), comprising:
- an operational amplifier configured to:
- receive an input voltage supplied to the SMPS as a first input;
- and
- a reference voltage as a second input;
- a comparator circuit configured to:
- receive an output of the operational amplifier;
- receive a current sense signal;
- and
- generate an output signal configured to control a power generator, the output signal based on a comparison between the output of the operational amplifier and the current sense signal;
- wherein the operational amplifier is further configured to lower a maximum current input limit of the SMPS as input voltage increases.
A switched mode power supply (SMPS), comprising:
- an operational amplifier configured to:
- receive an input voltage supplied to the SMPS as a first input;
- and
- a reference voltage as a second input;
- a pulse-width modulation power generator circuit configured to produce an output voltage based on a duty cycle of a pulse-width modulation output;
- and
- a comparator circuit configured to:
- receive an output of the operational amplifier;
- receive a current sense signal based on output of the pulse-width modulation power generator circuit;
- and
- generate an output signal configured to control the pulse-width modulation power generator, the output signal based on a comparison between the output of the operational amplifier and the current sense signal;
- wherein the operational amplifier is further configured to lower a maximum current input limit of the SMPS as input voltage increases.
A microcontroller, comprising:
- a switched mode power supply (SMPS);
- an operational amplifier configured to:
- receive an input voltage supplied to the SMPS as a first input;
- and
- a reference voltage as a second input;
- and
- a comparator circuit configured to:
- receive an output of the operational amplifier;
- receive a current sense signal;
- and
- generate an output signal configured to control a power generator, the output signal based on a comparison between the output of the operational amplifier and the current sense signal;
- wherein the operational amplifier is further configured to lower a maximum current input limit of the SMPS as input voltage increases.
Dependencies are inferred from the claim text.