US 8,542,473 B2 · Resistance determining system and method for circuit protection

Abstract

A resistance determining system and method for a protection circuit, includes a resistance determining unit. The resistance determining unit interconnects a microcontroller and a digital resistor, where the microcontroller has first setting voltage corresponding to a first voltage threshold for activating the protection circuit, and the microcontroller is capable of receiving and converting a first external voltage input to the protection circuit to be a first converted voltage. The digital resistor includes a first variable resistor having two terminals connected to the respective first terminal and the second terminal. The microcontroller adjusts a resistance of the first variable resistor to be a first threshold resistance if the first converted voltage is substantially equal to the first voltage threshold, and the first resistance is determined to be substantially equal to the first threshold resistance.

Claims8

Dependent claims

A resistance determining system for a protection circuit, the protection circuit having a first terminal and a second terminal for receiving a first resistance used in activating the protection circuit, the system comprising:

a resistance determining unit, the resistance determining unit comprising:
a microcontroller having a first setting voltage corresponding to a first voltage threshold for activating the protection circuit, the microcontroller receiving and converting a first external voltage input to the protection circuit to be a first converted voltage;
and
a digital resistor connected to the microcontroller, the digital resistor comprising a first variable resistor having two terminals connected to the first terminal and the second terminal, respectively, the microcontroller adjusting a resistance of the first variable resistor to be a first threshold resistance to activate the protection circuit when the first converted voltage is equal to the first voltage threshold, and the first resistance of the protection circuit being determined to be equal to the first threshold resistance.

1 more element

A resistance determining method for a protection circuit, the protection circuit having a first terminal and a second terminal for receiving a first resistance used in activating the protection circuit, the method comprising:

providing a resistance determining unit comprising a microcontroller and a digital resistor connected to the microcontroller, the microcontroller having a first setting voltage corresponding to a first voltage threshold for activating the protection circuit, the digital resistor comprising a first variable resistor having two terminals;
connecting the two terminals of the first variable resistor to the first and second terminals;
receiving and converting a first external voltage input to the protection circuit to be a first converted voltage using the microcontroller;
comparing the first converted voltage with the first setting voltage using the microcontroller;
adjusting a resistance of the first variable resistor to be a first threshold resistance using the microcontroller when the first converted voltage is equal to the first setting voltage;
and
determining the resistance of the first resistance as being equal to the first threshold resistance.

4 more elements

Dependencies are inferred from the claim text.

Resistance determining system and method for circuit protection

Life of this patent

Resistance determining system and method for circuit protection

Life of this patent

Abstract

Claims8