Automatic water level alarm circuit of solar water heater

Abstract

The invention discloses an automatic water level alarm circuit of a solar water heater. The automatic water level alarm circuit comprises a transformer B, full-wave rectifiers (D1 to D4), three LED (Light Emitting Diode) indicating lamps and three water level electrodes, wherein the full-wave rectifiers are used for supplying a direct-current (DC) working voltage of 12V to the circuit; an LED 1 is a power indicator, an LED 2 is a high-water-level indicator, an LED 3 is a low-water-level indicator, an electrode 3 is a common signal electrode, an electrode 1 is a high-water-level electrode, and an electrode 2 is a low-water-level electrode. The automatic water level alarm circuit further comprises a music module M, a power amplification circuit and a loudspeaker Y, wherein the music module M is provided with four ports, namely a port 1, a port 2, a port 3 and a port 4, the port 1 and the port 2 are input terminals, the port 1 is connected to output terminals of the full-wave rectifiers (D1 to D4), the port 2 is connected to an intermediate node of capacitors (C2 and C3), the port 3 serves as a signal output terminal and is connected to an input terminal of the power amplification circuit, the port 4 is grounded, and an output terminal of the power amplification circuit is connected to the loudspeaker Y so as to drive the loudspeaker Y to emit alarming sound. According to the automatic water level alarm circuit, a music alarm module is added into the existing water level alarm circuit, so that the alarming effect is more obvious and more user-friendly.

Description

Technical field [0001] The invention relates to an automatic water level alarm of a solar water heater, and specifically discloses an automatic water level alarm circuit of a solar water heater. Background technique [0002] Now that life is better, many families have used solar water heaters, which use solar energy, clean and pollution-free, practical and inexpensive, and are well liked. However, most of the solar water heaters on the market have full water alarm devices that are too simple and only have a return pipe. The water flowing out of the return pipe is easily overlooked, which is easy to cause water waste. Later, a simple water level alarm appeared, which can warn both high and low water levels, but its circuit only uses LED lights to indicate alarm, and the alarm effect is not obvious and not humane enough. Summary of the invention [0003] Aiming at the shortcomings of the above-mentioned existing water level alarms that only use LED lights to indicate alarm, the...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages that the above-mentioned existing water level alarms only use LED lights to indicate alarms, the alarm effect is not obvious, and it is not humanized enough, the present invention provides an automatic water level alarm circuit for solar water heaters

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