Traditional Chinese Practical Power-saving: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Power-saving. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 6531 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Energy-saving thermostat dual-purpose deviceWith the improvement of people's living standards, various household appliances have entered the family one after another. Among them, such as electric irons, electric water heaters and electric soldering irons, etc., when they are in a stable high temperature state, their temperatures will not drop if the power supply is intermittent, but they can save a lot of electricity over time. If the temperature can be adjusted as needed, the power saving effect will be even more obvious.The power-saving thermostat dual-purpose device is designed to achieve the above purpose. It has the characteristics of simple structure, small size, low price, easy use and significant power-saving effect. It is introduced as follows.1. Circuit working principleThe circuit of the power-saving thermostat dual-purpose device is shown in Figure 22-2. It is composed of a capacitor step-down voltage-stabilizing power supply circuit and a time base circuit with adjustable duty cycle.Figure 22-1In the figure, capacitor C1, diode D1, Zener diode DW and electrolytic capacitor C2 form a capacitor step-down voltage stabilizing circuit, which outputs a stable DC voltage of 12V.IC is a time base integrated circuit, which together with resistors R2, R3, potentiometer W and capacitor C3, forms a self-excited multivibrator with adjustable duty cycle. Among them, diode D2 is the charging guide tube, and diode D3 is the discharge guide tube. When the movable arm of the potentiometer W slides to the right end, the duty factor Dy is:Dymax=tcharge/T=(1kΩ+10MΩ)/〔(10MΩ+1kΩ)+1kΩ〕≈ …
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Lei Cheng
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