Power ic and driving method thereof
AssigneeDongbu HiTek Co., Ltd.
InventorsSung-Min Park, Seok-Hoon Bang
Life of this patent
Estimating the term…
Abstract
A power integration circuit includes: a first transistor having a control electrode connected to a first voltage source to be supplied with a control signal therefrom, the first transistor being connected between a switch and a ground. A sense resistor has one end connected to the ground. A second transistor has a control electrode connected to the first voltage source to be applied with a control signal therefrom, with the second transistor being connected between the switch and the other end of the sense resistor. The power integration circuit further includes: a comparator for comparing the sense voltage with the reference voltage and delivering a difference between the sense voltage and the reference voltage to a logic circuit.
Claims20
An apparatus comprising:
- a first transistor having a control electrode connected to a first voltage source carrying a control signal, the first transistor being connected between a switch and a ground;
- a sense resistor having a first end and a second end, with the first end connected to the ground;
- a second transistor having a control electrode connected to the first voltage source carrying the control signal, the second transistor being connected between the switch and the second end of the sense resistor;
- and
- a comparator electrically connected to the second end of the sense resistor, thereby receiving a sense voltage at a first input terminal, and receiving at a second input terminal a reference voltage supplied from voltage dividing resistors connected between a second voltage source and the ground, for comparing the sense voltage with the reference voltage and outputting a difference between the sense voltage and the reference voltage to a logic circuit.
A method comprising:
- controlling the on-state of a first transistor and a second transistor by a control signal from a first voltage source;
- supplying a first current from a switch to be branched into the first transistor and the second transistor and flow into a ground;
- supplying a sense voltage which is a potential difference between the ground and a sense resistor connected between the second transistor and the ground to a first comparator input;
- supplying a second current flowing from a second voltage source through a first voltage dividing resistor and a second voltage dividing resistor into the ground;
- supplying a reference voltage, formed by the second current flowing between second voltage dividing resistor and the ground, to the comparator;
- and
- comparing the sense voltage with the reference voltage to output a result of the comparison to a logic circuit from the comparator.
A method comprising:
- controlling the on-state of a first transistor and a second transistor by a control signal from a first voltage source;
- supplying a first current from a switch to be branched into the first transistor and the second transistor and flow into a ground through a parasitic resistance;
- supplying a sense voltage which is a potential difference between the ground and a sense resistor connected between the second transistor and the ground through the parasitic resistance to a first comparator input;
- supplying a second current flowing from a second voltage source through a first voltage dividing resistor and a second voltage dividing resistor into the ground through the parasitic resistance;
- supplying a reference voltage, formed by the second current flowing between second voltage dividing resistor and the ground through the parasitic resistance, to the comparator;
- and
- comparing the sense voltage with the reference voltage to output a result of the comparison to a logic circuit from the comparator.
Dependencies are inferred from the claim text.