Pulse width modulated multiple heater control

摘要

A system includes, in one example, a first heater device, a second heater device, and a temperature sensor, each disposed within a fluid flow. The system further includes a controller communicatively coupled to the first heater device, the second heater device, and the temperature sensor. The controller is configured to receive, from the temperature sensor, an indication of a measured temperature of the fluid flow. The controller is further configured to control, based on a difference between the measured temperature of the fluid flow and a target temperature, operation of the first heater device via a first pulse width modulation signal and operation of the second heater device via a second pulse width modulation signal.

主权项

1. A system comprising:
a first heater device, a second heater device, and a temperature sensor, each disposed within a fluid flow; and a controller communicatively coupled to the first heater device, the second heater device, and the temperature sensor, the controller configured to:
receive, from the temperature sensor, an indication of a measured temperature of the fluid flow; andcontrol, based on a difference between the measured temperature of the fluid flow and a target temperature, operation of the first heater device via a first pulse width modulation signal and operation of the second heater device via a second pulse width modulation signal by at least being configured to:
increase, in response to determining that the measured temperature of the fluid flow is less than the target temperature, a duty cycle of the first pulse width modulation signal up to a first threshold duty cycle while maintaining the second pulse width modulation signal at a duty cycle of zero; andupon the first pulse width modulation signal reaching the first threshold duty cycle, increase, in response to determining that the measured temperature of the fluid flow is less than the target temperature, a duty cycle of the second pulse width modulation signal up to a second threshold duty cycle while maintaining the first pulse width modulation signal at the first threshold duty cycle.