Aspirated smoke fire detector, fire protection system, airflow detection circuit and method
US12217585B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 29, 2024 |
| Grant date | Feb 4, 2025 |
| Priority date | — |
| Expiry date | Aug 29, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/188
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present disclosure provides an airflow detection circuit, wherein the airflow detection circuit includes: a first thermistor, one terminal of the first thermistor being coupled to a first resistor and a first switch, and the other terminal of the first thermistor being coupled to a first input terminal of a first operational amplifier; a second thermistor, one terminal of the second thermistor being coupled to the first resistor and the first switch, and the other terminal of the second thermistor being coupled to a second input terminal of the first operational amplifier; a voltage source, coupled to the first resistor and the first switch and configured to provide a supply voltage for the first thermistor and the second thermistor through a corresponding supply path based on ON or OFF of the first switch; and a controller, coupled to an output terminal of the first operational amplifier and configured to collect an output signal of the first operational amplifier and determine an airflow flow rate based on the output signal. The airflow detection circuit of the present disclosure senses a temperature through the first thermistor and the second thermistor and determines the ai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.