High voltage stabilizing circuit diagram composed of optocouplers

Circuit is shown. Normal driving transistor would need a higher breakdown voltage transistor (FIG driving tube 9013). When the output voltage increases, VT55 bias increases, B5

light emitting diode forward current increases, the voltage between the photodiode decreases, the regulator be biased to reduce junction resistance increases and the output voltage decreases ; on the contrary, the output voltage increases, thereby maintaining a stable output voltage.

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