A controller for double heating tubes

Abstract

The invention relates to a controller with double heating pipes. The controller comprises an interlock circuit composed of a processing module and a heating interlock module. The heating interlock module comprises two paths of circuits. Each path of the circuits comprises a relay switch, a trigger switch module and a NOT gate logic module. An input control terminal of the relay switch is connected with the processing module. A controlled terminal switch of the relay switch is in series connection with a power supply circuit of a heating pipe. The relay switch is used for receiving a high or low level signal to control the connection and disconnection of the controlled terminal switch. An input control terminal of the trigger switch module is in parallel connection with the heating pipe in the path of the circuits. An output terminal and a switch terminal of the trigger switch module are in series connection with a capacitor charging circuit. The trigger switch module is used for triggering an output terminal switch to close when the heating pipe is working. An input terminal of the NOT gate logic module is connected with a capacitor. An output terminal of the NOT gate logic module is connected to an input control terminal of a relay switch of another path of the circuits. According to the invention, the controller can monitor a work status of a heating pipe of a water heater in real time and give advance warning when the heating pipe or a relay controlling the heating pipe is abnormal, and a safe power utilization environment is provided for a user.

Description

technical field [0001] The invention relates to the technical field of electric water heaters with double heating pipes, in particular to a controller with double heating pipes. Background technique [0002] In order to meet the user's requirement of quickly bathing and increasing the capacity of the existing water storage electric water heater, two high-power heating tubes are usually added to the water heater, and the total power of the two heating tubes exceeds 5 kilowatts. , now the controller generally controls one heating tube to be turned on at the same time. When the user does not have a bathing requirement, the first heating tube with low power is used to heat the whole water. When there is a bathing requirement, the first heating tube is turned off, and the high The power of the second heating tube, so that the water can be heated quickly to complete. [0003] The control switch of the heating tube power supply mainly uses a relay. The current water heater control...

AI Technical Summary

Problems solved by technology

When the relay is stuck, the control unit cannot effectively detect the abnormality, causing the heating tube to continue to heat

Over-temperature will be caused for a long time, causing the mechanical thermostat of the water heater to operate, directly cutting off the power supply of the water heater, the whole water heater cannot work, and can only be repaired, causing a lot of inconvenience to the user

The relay used as a control switch will have poor contact after working for a long time, causing the heating tube to not heat

If the other relay that controls the heating tube is turned on during the time when one heating tube is turned on, overpower will occur, which will cause the circuit to catch fire or burn out, and directly cause damage to the user's electrical environment.

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