FLOW SENSOR HEATER CIRCUIT CALIBRATION

A heater control circuit in a fluid flow sensor. The circuit comprises first, second, and third resistors, a heater resistor, a trimmable resistor, and a switch. A positive terminal of the first resistor is connected to a positive terminal of the trimmable resistor, a negative terminal of the first resistor is connected to a positive terminal of the heater resistor, a negative terminal of the trimmable resistor is connected to a positive terminal of the second resistor, a negative terminal of the second resistor is connected to a positive terminal of the third resistor, and a negative terminalof the heater resistor is connected to a negative terminal of the third resistor, the terminals of the second resistor are attached to the terminals of the switch, where the switch is configured closed in a calibration mode and configured open in a flow sensing mode. 流量传感器加热器电路校准。种流体流量传感器中的加热器控制电路。该电路包括第、第二和第三电阻器，加热器电阻器，可微调电阻器以及开关。第电阻器的正端子连接到可微调电阻器的正端子，第电阻器的负端子连接到加热器电阻器的正端子，可微调电阻器的负端子连接到第二电阻器的正端子，第二电阻器的负端子连接到第三电阻器的正端子，并且