| 摘要 |
Provided is a thermal flow sensor capable of obtaining a flow rate detection signal that differs depending on a flow direction of a fluid, with a simple configuration and at low cost. The thermal flow sensor includes: a bridge circuit (1) for outputting a flow rate detection signal (VM); a fluid direction detection circuit (2) for outputting a fluid direction detection signal (VD); and an arithmetic circuit (3, 4, 6) configured to: generate a first output signal (VQF) and a second output signal (VQR) based on the flow rate detection signal (VM) and the fluid direction detection signal (VD); and select the first output signal (VQF) when the fluid direction detection signal (VD) shows normal flow and select the second output signal (VQR) when the fluid direction detection signal (VD) shows reverse flow, to thereby output a flow rate detection signal (VOUT). |
