A radiant cooker, also known as a ceramic cooktop or hi-light cook, has a similar appearance to an induction cooktop, but the internal workings are quite different. In a radiant cooker, heat is generated from an electrical hotplate through electrical resistance, requiring effective heat isolation within the hotplate.
Safety is a crucial consideration for radiant cookers, as improper temperature control can lead to burning or even fire due to overheating. Traditional hotplates usually work in conjunction with a thermostat. However, with the advancement of electronic control systems, a new thermocouple control system has been implemented in radiant cookers. Thermocouples are used to detect temperature, and relays are used to switch and control the temperature. This system offers more precise and flexible temperature control, lower costs, and enables digital control, making it increasingly popular as a replacement for mechanical control.
Controllers for radiant cookers also exhibit several differences. Is a relay used as the control switch? Or is a triac used instead? Is the printed circuit board (PCB) a single-layer or double-layer design? Is the PCB made of paper or fiber?
Regarding the key point of safety, the controller should utilize at least two relays for controlling the power supply—one relay for the live line and another for the neutral line. However, many factories neglect this aspect to save costs. While the problem may not be immediately apparent in the short term, after several years of use, relying on only one relay for each burner can pose potential risks to users. If a control relay becomes stuck inside the contactor, it may result in a loss of relay control and lead to overheating, burning, or fire. Therefore, we strongly recommend using at least two relays for radiant cookers, allowing the system to detect any relay failures and promptly alert the user.
In terms of radiant cookers, the key aspect lies in the design of their structure. The hotplate reaches very high temperatures during operation, and without proper ventilation, the internal temperature can rise excessively. If the internal temperature exceeds 200°C, it can cause damage to internal components. Hence, it is crucial to ensure effective ventilation in the design of radiant cookers.