Floor Centralized Heating System

The response time of the heating mats protection system varies depending on the protection function, core components, heating mats type, and specific product. Here are some common response time introductions for protection functions:   Overheat protection At the hardware level: the temperature control switch generally operates within 1-5 seconds after the temperature exceeds the threshold (such as 70 ℃), causing the bimetallic strip to deform and disconnect the circuit. The response time of thermal fuses is relatively long. When the temperature suddenly rises, the low melting point alloy inside the fuse may melt within 10-30 seconds, permanently cutting off the circuit.   At the software level: the control chip is pre-set with an "over temperature threshold". If the sensor detects that the temperature exceeds the set limit value (such as 65 ℃), it can usually immediately cut off the power and light up the fault indicator light within 1-2 seconds.   Leakage protection: Insulation resistance monitoring can generally immediately power off and alarm within 1-2 seconds after detecting leakage current exceeding the set value (such as 0.5mA). The grounding protection (PE line) is combined with the residual current device (RCD), and in the event of leakage, the RCD can usually trip and cut off the power supply within tens of milliseconds.   Short circuit and overload protection: When the current exceeds the rated value, the fuse usually melts within 1-5 seconds. The overcurrent detection circuit monitors the current through a sampling resistor. If the current suddenly increases, the chip can cut off the MOS transistor switch within 10 milliseconds, and the response speed is much faster than traditional fuses.   The response time of the protection system varies for different types of heating mats. Traditional electric heating wire heating mats, due to the use of relatively simple protective devices, may have an overall response time of several seconds to tens of seconds; The carbon fiber smart and aluminum foil self temperature limiting high-end heating seats, with the help of advanced sensors, chips, and control algorithms, can usually shorten the response time to less than 1 second, and some high-end products can even reach millisecond level.