Heater temperature control circuit and sensor device using the same
US11510286B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2018 |
| Grant date | Nov 22, 2022 |
| Priority date | — |
| Expiry date | Aug 30, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/66
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a heater temperature control circuit including a heater and a control circuit that controls a temperature of the heater, wherein the control circuit includes a bridge circuit in which a first circuit and a second circuit are connected in parallel, and an operational amplifier connected to the bridge circuit, wherein in the first circuit, the heater and a resistor are connected in series, and a midpoint of the first circuit is connected to one input portion of the operational amplifier, and an output value Vout from the second circuit is input to the other input portion of the operational amplifier, the output value Vout being obtained by multiplying a division ratio of a target resistance value Rh of the heater and a resistance value R1 of the resistor with a reference voltage Vref of the bridge circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.