When the voltage less 3V + 2 feet, 3 feet high level, make the output is BG3, BG1 and BG2 saturated conductivity, to load power supply.This circuit by 555 as pulse oscillator. 555 feet with the 5 + 6V voltage by foot, from the benchmark voltage R7, R8 composed of sampling circuit in sampling voltage.
By R1, R2, C1, D1 composition, the circuit start-up circuit in the BG3 to provide base current, prompting switch conduction BG1 and BG2, and to provide working voltage, when 555 short-circuit, load 555 will lose working voltage, which BG3 BG1 and deadline to protect and BG2 circuit and switch. Meanwhile, the power to charge of 12v to 5v converter, when R6 C2 behaved 6 feet to + 9V potential. If 2 feet also reached 3V +, 3 feet above the low-level output capacitance, behaved, BG3 switch tube feet discharge BG1 and BG2 deadline, both.
When 2 feet that the voltage capacitance than 3V, 3 + feet high, and thus constantly output voltage output dc-dc converter and repeatedly rated output voltage stability in the 12V. In the 12V electrical appliances with diesel 24V mounted (e.g., instrumentation, ShouFangJi, electric fan, etc.), using the 12V three stabilizer. But because of the pressure drop of voltage, temperature, 24v to 12v converter
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