24V converting to 12V switching power supply circuit diagram

Published:2011/9/5 3:43:00 Author:Lucas | Keyword: switching power supply | From:SeekIC

The 24V diesel vehicles is fitted with 12V electrical appliances (such as instruments, cassette players, fans, etc.), usually it uses 12V three-terminal regulator. However, due to voltage drop on the regulator is up to 12V, the power dissipation and temperature is too high to be damaged easily. We design a switching power supply transformer which can reduce 24V voltage to 12V, and the circuit is shown as the figure. This circuit uses 555 as a pulse oscillator. Pin ⑤ of 555 is connected to a regulator to obtain the +6 V reference voltage, and pin ② gets the sample voltage from the sampling circuit composed of R7, R8. When the pin voltage of pin ② is less than +3 V, pin ③ outputs high, so BG3, BG1, BG2 are saturated conduction and provide voltage for the load.



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