Power saving water dispenser circuit

Single chip microcomputer STM32L151CCU6

One-piece inductor

Since the pure water in the heating tank is repeatedly heated for a long time after the water dispenser is turned on, it is not only unhealthy but also quite power-consuming. This figure adds several components to the water dispenser without powering down the appearance of the water dispenser. There is a boat-shaped heating switch K behind the water dispenser, which has two positions of heating and breaking. When K is turned on, the power supply is applied to both ends of the electric heating tube RL through the fuse F and the temperature controller WK. At the same time, the power supply is stepped down by the resistor R, the rectifier bridge Q is rectified, and the capacitor C is filtered to obtain a DC voltage of 15 V, so that the relay J operates. K1 is closed. If the heating switch is turned off at this time, the electric heating tube is still in the heating state until the water in the heating tank is heated to the set temperature, the thermostat WK is disconnected, the relay J is de-energized, K1 is disconnected, and the circuit exits the self-holding state. No longer heating in the future. It is better to use a smaller operating current for the relay to prevent excessive power consumption on the resistor R.