Method and apparatus for temperature measurement with voltage variation offset
AssigneeWinbond Electronics Corp.
InventorChuen-Min Lin
Life of this patent
Estimating the term…
Abstract
A method for temperature measurement with voltage variation offset implemented by comparing a sensing voltage with a reference voltage, wherein the sensing voltage and the reference voltage synchronously vary with a power supply, whereby the voltage variation between the sensing voltage and the reference voltage is obviated. An apparatus for temperature measurement includes a thermal detecting element, a sensing voltage dividing circuit connected between the thermal detecting element and the power supply, a reference voltage dividing circuit connected to the power supply, and a comparator connected to the sensing voltage dividing circuit and the reference voltage dividing circuit.
Claims7
A method for temperature measurement with voltage variation offset, the method comprising the steps of:
- applying a thermal detecting element adapted to sense temperature of an electronic element;
- applying a sensing voltage dividing circuit coupled between a power supply and the thermal detecting element to obtain a current;
- obtaining a sensing voltage from the sensing voltage dividing circuit, wherein the sensing voltage varies based on voltage variation of the power supply;
- obtaining a reference voltage from a reference voltage dividing circuit connected to the power supply;
- and
- comparing the sensing voltage with the reference voltage in a comparator to obtain an analog signal, wherein the analog signal is further converted into a digital signal by an A/D converter.
An apparatus for temperature measurement with voltage variation offset, the apparatus comprising:
- a thermal detecting element;
- a sensing voltage dividing circuit connected between the thermal detecting element and a power supply to provide a current to the thermal detecting element, wherein the sensing voltage dividing circuit is composed of a first resistor and a second resistor, and a sensing voltage is obtained from the sensing voltage dividing circuit;
- a reference voltage dividing circuit connected to the power supply to provide a reference voltage, wherein the reference voltage dividing circuit is composed of a third resistor and a fourth resistor;
- and
- a comparator comparing the sensing voltage with the reference voltage to obtain an analog signal, wherein the analog signal is further transferred into an analog/digital converter and is converted into a digital signal that represents a temperature value.
Dependencies are inferred from the claim text.