Mobile Toilet Circuit Diagram

Currently, there is no direct and complete overall circuit diagram for mobile toilets, but we can introduce their relevant power supply architectures and some circuit principles.

Power Supply Architecture of Mobile Public Toilets in Expressway Service Areas

The power supply system of mobile public toilets in expressway service areas has a relatively clear architecture. After the controller is connected to a 220V power source, it performs voltage conversion through an AC-DC module. The function of this module is to convert alternating current (AC) into direct current (DC), with the converted DC voltage typically being 12V or 24V. The converted DC power supplies various devices, including occupied/unoccupied signs, ceiling speakers, exhaust fans, toilet cubicle human body sensors, lighting fixtures, and smart door locks for partition doors. These devices do not operate independently but are connected to the controller via IO signals, enabling centralized control and management. For example, when someone enters a toilet cubicle, the human body sensor in the cubicle transmits a signal through the IO interface to the controller. The controller then controls the occupied/unoccupied sign to display the corresponding status according to a preset program and may also turn on the lighting fixture.

Circuit of Automatic Flushing Controller for Public Toilets

The circuit of the automatic flushing controller for public toilets has a unique design. Its power supply section consists of a transformer T, VD1-VD4, VD5, and C1, forming a 12V power supply circuit. Among them, the transformer T reduces the input AC voltage to an appropriate level; VD1-VD4 form a rectifier bridge, converting AC into pulsating DC; VD5 and C1 play roles in filtering and voltage regulation, ultimately outputting a stable 12V DC power supply for the entire automatic flushing controller circuit.

The NE555 timer circuit is the core control component of this automatic flushing controller. It forms a pulse signal oscillator with adjustable duty cycle along with surrounding components. Through this oscillator, the controller can automatically adjust the water discharge frequency of the solenoid valve according to different time periods. During the day when more people use the toilet, the number of water discharges increases accordingly; at night when fewer people use the toilet, the interval between water discharges becomes longer. At the same time, the circuit also has a manual water discharge control function, facilitating operation under special circumstances.